CN206328336U - The system of nitrogen oxides in a kind of coke oven exhaust gas from Sources controlling - Google Patents
The system of nitrogen oxides in a kind of coke oven exhaust gas from Sources controlling Download PDFInfo
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- CN206328336U CN206328336U CN201621454519.8U CN201621454519U CN206328336U CN 206328336 U CN206328336 U CN 206328336U CN 201621454519 U CN201621454519 U CN 201621454519U CN 206328336 U CN206328336 U CN 206328336U
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- temperature
- flue
- coke
- nitrogen oxides
- coke oven
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Abstract
The utility model discloses a kind of system of nitrogen oxides in coke oven exhaust gas from Sources controlling.The system includes：PLC control unit, flame temperature monitoring unit, fume component analysis unit, furnace roof peephole pressure monitoring unit, gas flow control unit, coking end time discriminatory analysis unit, coke maturity discriminatory analysis unit and single combustion chamber control unit.NO is controlled on sourcex, by combustion control technology, the technological means such as control air capacity, the distribution of fire path temperature, control chamber pressure distribution controls NOxGeneration, this method input is small, almost without operating cost.
Description
Technical field
The utility model belongs to coking by coke oven technical field of automatic control, more particularly to a kind of useless from Sources controlling coke oven
The system of nitrogen oxides in gas.
Background technology
With the fast development of China's ferrous metallurgical industry so that the coking industry for providing important source material for blast furnace ironmaking is obtained
Fast development has been arrived, and coking is a complicated technical process, has both consumed the substantial amounts of energy, can also discharge and largely contain nitrogen oxidation
Thing (NOx) waste gas, nitrogen oxides (NOx) mainly account for 95% and nitrogen dioxide (NO including nitric oxide (NO)2) it is 5%.Due to
Nitrogen oxides all generates tremendous influence as pollutant effulent to human health and ecological environment, in human health side
Face, nitrogen oxides can all produce consumingly stimulation to the eyes and respiratory tract of people, returned when serious and cause bronchitis and right
Lung produces rotten candle；In terms of ecological environment, nitrogen oxides is the main thing for causing acid rain, greenhouse effects and damaging the ozone layer
One of matter, while nitrogen oxides is also the main component of current China's haze weather.In order to control the further evil of atmospheric environment
Change, the strict environmental protection standard that country is formulated coking industry：That is the NO of coke oven smoke stack emissionxIt is necessarily less than 500mg/m3, and
This standard was enforced in 2015.
At present to coking industry nitrogen oxides (NOx) control method, control, controlled after burning main after mainly burning
Technological means be denitrating flue gas, i.e., flue gases of cock oven is released, is heated to 400-500 DEG C, then in the effect of catalyst
It is lower to be chemically reacted with ammonia, and then slough the NO in flue gasx, not only one-time investment is big for this method, and operating cost
Also it is very high, it is the expense that is difficult to bear for struggling at present being full of/losing the coal chemical enterprise on line.
Utility model content
In order to overcome the defect of prior art, the purpose of this utility model is to provide a kind of from Sources controlling coke oven exhaust gas
The system of middle nitrogen oxides, the control to nitrogen oxides in coke oven exhaust gas is realized from source, while reducing energy resource consumption, protection ring
Border.
Principle of the present utility model is：The formation mechenism of nitrogen oxides is generated in coke oven combustion process three types：①
The type of Components Fuel containing N NO：Organonitrogen compound in fuel aoxidizes the nitrogen oxides of generation in combustion, and main cause is
Caused by the leakage of body of heater string；2. hydrocarbon fuel Quick-type NO：Hydrocarbon system fuel is decomposed in burning, and its catabolite and nitrogen are anti-
The nitrogen oxides that should be generated, mainly indivedual quirk air capacities are not caused enough；3. temperature thermal NO：Burning is aerial
Nitrogen aoxidizes the nitrogen oxides of generation at high temperature, and mainly normal temperature is too high caused, passes through combustion control technology, control
The technological means such as air capacity, the distribution of fire path temperature, control chamber pressure distribution, from Sources controlling NOxGeneration.
To achieve these goals, the utility model employs following technical scheme：
A kind of system of nitrogen oxides in coke oven exhaust gas from Sources controlling, the system includes：PLC control unit, for controlling
The work of whole system processed；
Flame temperature monitoring unit, it has the optical lens of an alignment flue bottom trigonum center, and peace
Above each carbonization chamber, for monitoring the temperature in flue in real time；
Fume component analysis unit, including mobile flue gas analytical instrument and fixed fume component analysis instrument, wherein moving
Fume component analysis instrument is used to be sampled each combustion chamber of coke oven and each flue analysis, monitors efficiency of combustion；It is fixed
Fume component analysis instrument is arranged at each point flue, for the smoke components in the monitoring in real time of point flue with controlling full stove；
Furnace roof peephole pressure monitoring unit, including installed in the high temperature resistant differential manometer of peephole, for monitor in real time with
The change of peephole pressure is controlled, the control of point flue suction force is supplemented and corrected according to peephole pressure；
Gas flow control unit, using preceding feedback mode control, is controlled by gas pressure precision and prediction regulates and controls, used
In stablizing gas flow.
In the above-mentioned coke oven exhaust gas from Sources controlling in the system of nitrogen oxides, optionally, also including single combustion chamber control
Unit processed, single combustion chamber control unit includes two explosion-proof Pneumatic butterfly valves being arranged on the branch gas tube supplied to combustion chamber,
Two explosion-proof Pneumatic butterfly valves are electrically connected with above-mentioned PLC control unit respectively, and a combustion chamber is connected to two adjacent charcoals
Change room, according to the coking state and the variation tendency of flue temperature of two neighboring carbonization chamber, for adjusting heating coal in real time
Throughput.
Due to two carbonization chambers be in different coking states, their coke pushing coaling the time be more than be separated by 4~8 hours,
Carbonization chamber is in the different coking moment, and the heat of absorption is different, at coking initial stage, it is necessary to evaporate substantial amounts of moisture and wave
Part is sent out, amount of heat is absorbed, causes flue temperature to decline, in coking latter stage, coke is mature on the whole, the heat very little of absorption,
Flue temperature rises rapidly.Although coking technique uses 5：2 string sequences or 9：2 string sequences, during two adjacent carbonization chamber cokings
Between stagger, but flue temperature fluctuation is larger, and the fluctuation of general temperature is in 60 DEG C of annexes, even up to 120 DEG C had；In coal gas
Explosion-proof Pneumatic butterfly valve is installed on branch pipe, according to the variation tendency of flue temperature, heating gas flow is adjusted in real time, particularly
After carbonization chamber fire drop point, very little of absorbing heat, flue temperature rises rapidly, gas flow lowered, can be the ripple of temperature
It is dynamic to reduce.
In the above-mentioned coke oven exhaust gas from Sources controlling in the system of nitrogen oxides, optionally, also sentence including coking end time
Disconnected analytic unit, for discriminatory analysis coking end time CI=Tc/Tm, wherein：Tc- coking cycles, min；Tm- since coalingging to
Raw gas temperature reaches the time of maximum, min, and according to coking end time curve adjustment straight trip uniformity, horizontally-arranged uniformity is
The index of the ripe uniformity of carbonization chamber is described, horizontally-arranged index is good, show that charge of coke is laterally ripe uniform, the Center Temperature of Coke Cake of pusher side
It is high good to uniformity as the Center Temperature of Coke Cake of coke side, show that charge of coke top, middle part, bottom are ripe consistent, charge of coke is uniform
Good, coke quality steady is not in that bottom Jiao overdoes, the burnt situation wilfully in top.
In the above-mentioned coke oven exhaust gas from Sources controlling in the system of nitrogen oxides, optionally, also including coke maturity
Discriminatory analysis unit, for discriminatory analysis coke maturity K=(Tc-Tm)/Tc, and it is horizontally-arranged according to the adjustment of coke temperature curve
Even property, coking end time curve reflects the overall ripe situation of coke in carbonization chamber and ripe time, if straight trip uniformity
It is good, it is possible to normal temperature is greatly lowered on the premise of coke quality is ensured, energy consumption is greatly lowered.
In the above-mentioned coke oven exhaust gas from Sources controlling in the system of nitrogen oxides, optionally, the flame temperature monitoring
Unit includes optical lens, optical fiber and infrared optical fiber instrument, and optical lens is directly installed on the peephole small furnace cover of furnace roof, leads to
Cross range estimation and aim at alignment flue bottom trigonum center；The optical signal of optical lens is transmitted source, work temperature by optical fiber
≤ 300 DEG C of degree, and short-term job temperature≤450 DEG C；Optical signal is changed into temperature signal by infrared optical fiber, and operating temperature is≤60
℃。
Brief description of the drawings
The technical solution of the utility model is described in further detail below with reference to drawings and Examples, still
It should be known that these accompanying drawings only design for task of explanation, therefore not as the restriction of the utility model scope.In addition,
Unless otherwise indicated, these accompanying drawings are meant only to conceptually illustrate structure construction described herein, without to carry out to scale
Draw.
Fig. 1 is the utility model flame temperature monitoring unit structural representation；
Fig. 2 is the utility model flame temperature measurement point diagram；
Fig. 3 is the utility model flame temperature measuring point distribution map；
Fig. 4 is the utility model flame temperature monitoring figure in real time；
Fig. 5 is the utility model gas flow control unit structural representation；
Fig. 6 is the utility model single combustion chamber control unit structural representation；
Fig. 7 is that carbonization chamber fire of the present utility model falls temperature profile；
Fig. 8 is flue temperature of the present utility model with coking time changing rule figure.
Embodiment
Firstly, it is necessary to which explanation, the utility model will be illustrated by way of example from Sources controlling coke oven below
Concrete structure, feature and advantage of the system of nitrogen oxides of exhaust gas etc., but all descriptions are intended merely to what is illustrated,
And should not be construed as forming the utility model any limitation.In addition, being described by the mentioned each embodiments of this paper
Or implicit any single technical characteristic, or shown or implicit any single technical characteristic in the drawings, still may be used
Proceed to be combined or delete between these technical characteristics (or its equivalent), may be without herein so as to obtain
The more other embodiments of the present utility model directly referred to.
Incorporated by reference to referring to figs. 1 to Fig. 8, below the embodiment that is just provided by this come to the utility model from Sources controlling
The system of nitrogen oxides is illustrative in coke oven exhaust gas.
A kind of system of nitrogen oxides in coke oven exhaust gas from Sources controlling, the system includes：PLC control unit, flame temperature
Spend monitoring unit, fume component analysis unit, furnace roof peephole pressure monitoring unit, gas flow control unit, coking end time
Discriminatory analysis unit, coke maturity discriminatory analysis unit and single combustion chamber control unit.
PLC control unit, the work for controlling whole system.As shown in Figure 1, Figure 2 and Figure 3, flame temperature monitoring is single
Member includes optical lens, optical fiber and infrared optical fiber instrument, and optical lens is arranged on the peephole small furnace cover of each carbonization chamber furnace top
On, aim at alignment flue bottom trigonum center by estimating；The optical signal of optical lens is transmitted source, work by optical fiber
Make temperature≤300 DEG C, and short-term job temperature≤450 DEG C；Optical signal is changed into temperature signal by infrared optical fiber, and operating temperature is
≤60℃。
Flame temperature monitoring unit is used to monitor the temperature in flue in real time, obtains flame temperature as shown in Figure 4 real
When monitoring figure.
Fume component analysis unit, including mobile flue gas analytical instrument and fixed fume component analysis instrument, mobile flue gas
Analytical instrument and fixed fume component analysis instrument are electrically connected with PLC control unit, wherein moving flue gas analytical instrument
For being sampled analysis to each combustion chamber of coke oven and each flue, monitoring efficiency of combustion (including remaining oxygen, CO etc.)；Gu
Determine fume component analysis instrument to be arranged at each point flue, for the smoke components in the monitoring in real time of point flue with controlling full stove；
The coke oven parameter used in the utility model embodiment：2*61 combustion chamber, 2*61*32 flue, are dividing
Fixed fume component analysis instrument is installed on flue, each flue and combustion chamber is analyzed with moving flue gas analytical instrument first
Each flue or combustion chamber, are then adjusted to basically identical state, the waste gas data of analysis point flue by situation.
Herein under basis, by the analysis to smoke components, efficiency of combustion is improved, it is to avoid localized hyperthermia occur, so as to increase
Plus Quick-type NOxGeneration.
Further, furnace roof peephole pressure monitoring unit includes the high temperature resistant differential manometer installed in peephole, high temperature resistant
Differential manometer and PLC control unit electrical connection peephole pressure are small or negative pressure occur, air suction coking furnace shaft, cause energy consumption to increase
Greatly；Peephole pressure is big, and thermometric is inconvenient, and peephole pressure is also that reflection suction controls whether a suitable reference index,
In coke oven heating control, monitoring peephole pressure, and being mended according to peephole pressure to the control of point flue suction force in real time
Fill and correct, effectively control fuel type NOxGeneration.
In addition, as in Fig. 5, fluctuation and coke oven due to coke-stove gas main pipe pressure are frequently exchanged, cause to enter combustion
Gas flow (pressure) fluctuation for burning room is a lot, very unfavorable to optimization burning, and gas flow control unit passes through gas pressure
Accurate control program and prediction regulate and control, and can effectively stablize gas flow, the stabilization of flow or pressure fluctuated by main pipe pressure,
The factors such as swap operation influence, therefore the pattern being combined using preceding feedback control.Pass through the temperature to bulk temperature in coke oven stove
Degree control, normal temperature will not be too high, so as to control thermal NOxGeneration.
With reference to shown in Fig. 6, single combustion chamber control unit includes two be arranged on the branch gas tube supplied to combustion chamber
Explosion-proof Pneumatic butterfly valve, two explosion-proof Pneumatic butterfly valves are electrically connected with above-mentioned PLC control unit respectively, and a combustion chamber is connected to
Two adjacent carbonization chambers, according to the coking state and the variation tendency of flue temperature of two neighboring carbonization chamber, for reality
When adjust heating gas flow.
Due to two carbonization chambers be in different coking states, their coke pushing coaling the time be more than be separated by 4~8 hours,
Carbonization chamber is in the different coking moment, and the heat of absorption is different, at coking initial stage, it is necessary to evaporate substantial amounts of moisture and wave
Part is sent out, amount of heat is absorbed, causes flue temperature to decline, in coking latter stage, coke is mature on the whole, the heat very little of absorption,
Flue temperature rises rapidly.Although coking technique uses 5：2 string sequences or 9：2 string sequences, during two adjacent carbonization chamber cokings
Between stagger, but flue temperature fluctuation is larger, and the fluctuation of general temperature is in 60 DEG C of annexes, even up to 120 DEG C had；In coal gas
Explosion-proof Pneumatic butterfly valve is installed on branch pipe, according to the variation tendency of flue temperature, heating gas flow is adjusted in real time, particularly
After carbonization chamber fire drop point, very little of absorbing heat, flue temperature rises rapidly, gas flow lowered, can be the ripple of temperature
It is dynamic to reduce, as shown in Figure 8.
On the one hand, the temperature control in whole coke oven stove is stablized relatively；On the other hand, ensureing that coke maturity satisfaction will
On the premise of asking, the usage amount of coal gas is reduced as far as possible, energy consumption greatly reduces.
In the utility model, coking end time discriminatory analysis unit is further comprises in the system and coke maturity judges to divide
Analyse unit.
As shown in fig. 7, coking end time discriminatory analysis unit is used for discriminatory analysis coking end time CI=Tc/Tm, wherein：Tc-
Coking cycles, min；Since Tm- reach the time of maximum coalingging to raw gas temperature, min, and according to coking end time curve
Adjustment straight trip uniformity, horizontally-arranged uniformity is the index for describing the ripe uniformity of carbonization chamber, and horizontally-arranged index is good, shows that charge of coke is horizontal
Ripe uniform, the Center Temperature of Coke Cake of pusher side is high good to uniformity as the Center Temperature of Coke Cake of coke side, shows on charge of coke
Portion, middle part, bottom are ripe consistent, and charge of coke is uniformly good, coke quality steady, is not in that bottom Jiao overdoes, and top is burnt wilfully
Situation；Coke maturity discriminatory analysis unit, for discriminatory analysis coke maturity K=(Tc-Tm)/Tc, and according to coke temperature
Line of writing music adjusts horizontally-arranged uniformity, when coking end time curve reflects the overall ripe situation of coke in carbonization chamber and be ripe
Between, if straight trip uniformity is good, it is possible to normal temperature is greatly lowered on the premise of coke quality is ensured, is greatly lowered
Energy consumption.
Nitrogen oxides in only elaborating the coke oven exhaust gas of the present utility model from Sources controlling by way of example above
System, this few example are only used for explanation principle of the present utility model and embodiments thereof, rather than to limitation of the present utility model,
In the case where not departing from spirit and scope of the present utility model, those skilled in the art can also make various modifications and change
Enter.Therefore, all equivalent technical schemes all should belong to category of the present utility model and will for every right of the present utility model
Ask and limited.
Claims (5)
1. the system of nitrogen oxides in a kind of coke oven exhaust gas from Sources controlling, it is characterised in that the system includes：PLC controls are single
Member, the work for controlling whole system；
Flame temperature monitoring unit, it has the optical lens of an alignment flue bottom trigonum center, and is arranged on
Above each carbonization chamber, for monitoring the temperature in flue in real time；
Fume component analysis unit, including mobile flue gas analytical instrument and fixed fume component analysis instrument, wherein moving flue gas
Analytical instrument is used to be sampled each combustion chamber of coke oven and each flue analysis, monitors efficiency of combustion；Fixed flue gas
Analytical instrument is arranged at each point flue, for the smoke components in the monitoring in real time of point flue with controlling full stove；
Furnace roof peephole pressure monitoring unit, including installed in the high temperature resistant differential manometer of peephole, for monitoring in real time and control
The change of peephole pressure, is supplemented and is corrected to the control of point flue suction force according to peephole pressure；
Gas flow control unit, using preceding feedback mode control, is controlled by gas pressure precision and prediction regulates and controls, for steady
Determine gas flow.
2. the system of nitrogen oxides in the coke oven exhaust gas according to claim 1 from Sources controlling, it is characterised in that the system
Also include single combustion chamber control unit, single combustion chamber control unit includes two be arranged on the branch gas tube supplied to combustion chamber
Only explosion-proof Pneumatic butterfly valve, two explosion-proof Pneumatic butterfly valves are electrically connected with above-mentioned PLC control unit respectively, a combustion chamber connection
Two adjacent carbonization chambers, according to the coking state and the variation tendency of flue temperature of two neighboring carbonization chamber, are used for
Heating gas flow is adjusted in real time.
3. the system of nitrogen oxides in the coke oven exhaust gas according to claim 1 from Sources controlling, it is characterised in that the system
Also include coking end time discriminatory analysis unit, for discriminatory analysis coking end time CI=Tc/Tm, wherein：Tc- coking cycles,
min；Since Tm- reach the time of maximum, min coalingging to raw gas temperature, and adjusts straight trip according to coking end time curve
Uniformity.
4. the system of nitrogen oxides in the coke oven exhaust gas according to claim 1 from Sources controlling, it is characterised in that the system
Also include coke maturity discriminatory analysis unit, for discriminatory analysis coke maturity K=(Tc-Tm)/Tc, and according to coke temperature
Line of writing music adjusts horizontally-arranged uniformity.
5. the system of nitrogen oxides in the coke oven exhaust gas according to claim 1 from Sources controlling, it is characterised in that the fire
Flame temperature monitoring unit includes optical lens, optical fiber and infrared optical fiber instrument, and optical lens is directly installed on the peephole of furnace roof
On small furnace cover, alignment flue bottom trigonum center is aimed at by estimating；Optical fiber transmits the optical signal of optical lens
Source, operating temperature≤300 DEG C, and short-term job temperature≤450 DEG C；Optical signal is changed into temperature signal, work by infrared optical fiber
Make temperature for≤60 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621454519.8U CN206328336U (en) | 2016-12-28 | 2016-12-28 | The system of nitrogen oxides in a kind of coke oven exhaust gas from Sources controlling |
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| CN201621454519.8U CN206328336U (en) | 2016-12-28 | 2016-12-28 | The system of nitrogen oxides in a kind of coke oven exhaust gas from Sources controlling |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106753443A (en) * | 2016-12-28 | 2017-05-31 | 安徽工业大学 | The system of nitrogen oxides in a kind of coke oven exhaust gas from Sources controlling |
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2016
- 2016-12-28 CN CN201621454519.8U patent/CN206328336U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106753443A (en) * | 2016-12-28 | 2017-05-31 | 安徽工业大学 | The system of nitrogen oxides in a kind of coke oven exhaust gas from Sources controlling |
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Granted publication date: 20170714 Termination date: 20181228 |