CN106753443A - 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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- CN106753443A CN106753443A CN201611235840.1A CN201611235840A CN106753443A CN 106753443 A CN106753443 A CN 106753443A CN 201611235840 A CN201611235840 A CN 201611235840A CN 106753443 A CN106753443 A CN 106753443A
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- temperature
- flue
- coke
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
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Abstract
The invention 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 invention belongs to coking by coke oven technical field of automatic control, more particularly to one kind is from Sources controlling coke oven exhaust gas
The system of nitrogen oxides.
Background technology
With the fast development of China's ferrous metallurgical industry so that for the coking industry that blast furnace ironmaking provides important source material is obtained
Fast development has been arrived, and coking is a technical process for complexity, has both consumed the substantial amounts of energy, can also be discharged largely containing 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, controlled after mainly burning, controlled after burning main
Technological means be denitrating flue gas, i.e., flue gases of cock oven is released, 400-500 DEG C is heated to, 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.
The content of the invention
In order to overcome the defect of prior art, it is an object of the invention to provide one kind from Sources controlling coke oven exhaust gas nitrogen
The system of oxide, the control to nitrogen oxides in coke oven exhaust gas is realized from source, while reducing energy resource consumption, environmental protection.
Principle of the invention is：The formation mechenism that nitrogen oxides is generated in coke oven combustion process has three types：1. group containing N
Divide fuel type NO：Organonitrogen compound in fuel aoxidizes the nitrogen oxides of generation in combustion, and main cause is body of heater
String leakage causes；2. hydrocarbon fuel Quick-type NO：Hydrocarbon system fuel is decomposed in burning, and its catabolite and nitrogen reaction are given birth to
Into nitrogen oxides, mainly indivedual quirk air capacities not enough cause；3. temperature thermal NO：Burn aerial nitrogen
Aoxidize the nitrogen oxides of generation at high temperature, mainly normal temperature is too high causes, and by combustion control technology, controls air
The technological means such as amount, the distribution of fire path temperature, control chamber pressure distribution, from Sources controlling NOxGeneration.
To achieve these goals, present invention 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
Mounted in each carbonization chamber top, for the temperature in real-time monitoring flue；
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 of flue, in point flue real-time monitoring and the smoke components for controlling full stove；
Furnace roof peephole pressure monitoring unit, including installed in the high temperature resistant differential manometer of peephole, for real-time monitoring with
The change of peephole pressure is controlled, the control according to peephole pressure to point flue suction force is supplemented and corrected；
Gas flow control unit, using preceding feedback mode control, by the accurate control of gas pressure and prediction regulation and control, uses
In stablizing gas flow.
Above-mentioned from Sources controlling coke oven exhaust gas 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 to combustion chamber supply,
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, the variation tendency of coking state and flue temperature according to two neighboring carbonization chamber heats coal for real-time adjustment
Throughput.
Because two carbonization chambers are in different coking states, their coke pushing coaling the time more than being separated by 4~8 hours,
Carbonization chamber is in the different coking moment, and the heat of absorption is different, at the coking initial stage, it is necessary to evaporate substantial amounts of moisture and wave
Hair part, absorbs amount of heat, causes flue temperature to decline, and 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 sequence 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 for having；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 is lowered, can be the ripple of temperature
It is dynamic to reduce.
In the system of nitrogen oxides, optionally, also sentence including coking end time from Sources controlling coke oven exhaust gas above-mentioned
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 description carbonization chamber maturation uniformity, horizontally-arranged index is good, shows 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.
Above-mentioned from Sources controlling coke oven exhaust gas in the system of nitrogen oxides, optionally, also including coke maturity
Discriminatory analysis unit, it is for discriminatory analysis coke maturity K=(Tc-Tm)/Tc and horizontally-arranged according to the adjustment of coke temperature curve
Even property, coking end time curve reflects the time of the overall ripe situation of coke and maturation in carbonization chamber, if straight trip uniformity
It is good, it is possible to normal temperature to be greatly lowered on the premise of coke quality is ensured, energy consumption is greatly lowered.
Above-mentioned from Sources controlling coke oven exhaust gas 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
Technical scheme is described in further detail below with reference to drawings and Examples, but should
Know, these accompanying drawings are only designed for task of explanation, therefore not as the restriction of the scope of the invention.Additionally, removing non-specifically
Point out, these accompanying drawings are meant only to conceptually illustrate structure construction described herein, without to be drawn to scale.
Fig. 1 is flame temperature monitoring unit structural representation of the present invention；
Fig. 2 is flame temperature measurement point diagram of the present invention；
Fig. 3 is flame temperature measuring point distribution map of the present invention；
Fig. 4 is flame temperature real-time monitoring figure of the present invention；
Fig. 5 is gas flow control unit structural representation of the present invention；
Fig. 6 is single combustion chamber control unit structural representation of the present invention；
Fig. 7 is that carbonization chamber fire of the invention falls temperature profile；
Fig. 8 is flue temperature of the invention with coking time Changing Pattern figure.
Specific embodiment
Firstly, it is necessary to explanation, below will by way of example illustrate the present invention from Sources controlling coke oven exhaust gas
The concrete structure of the system of middle nitrogen oxides, feature and advantage etc., but all of description is intended merely to what is illustrated, without
It is to be understood as forming any limitation to the present invention.Additionally, be described by or imply in the mentioned each embodiments of this paper
Any single technical characteristic, or shown or implicit any single technical characteristic in the drawings, still can be in these skills
Proceed to be combined or delete between art feature (or its equivalent), so as to obtain no directly to refer to herein
Of the invention more other embodiments.
Incorporated by reference to referring to figs. 1 to Fig. 8, below the embodiment that is just given by this come to the present invention from Sources controlling coke oven
The system of nitrogen oxides of exhaust gas is illustrative.
A kind of system of nitrogen oxides in coke oven exhaust gas from Sources controlling, the system includes：PLC control unit, flame temperature
Degree 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
Unit 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℃。
The temperature that flame temperature monitoring unit is used in real-time monitoring flue, obtains flame temperature reality as shown in Figure 4
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, monitoring efficiency of combustion to each combustion chamber of coke oven and each flue (including remaining oxygen, CO etc.)；Gu
Fume component analysis instrument is determined at each point of flue, in point flue real-time monitoring and the smoke components for controlling full stove；
The coke oven parameter for using in the embodiment of the present invention：2*61 combustion chamber, 2*61*32 flue, in a point flue
It is upper that fixed fume component analysis instrument is installed, the feelings of each flue and combustion chamber are analyzed with mobile 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 condition.
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 is small with PLC control unit electrical connection peephole pressure or negative pressure occurs, and air suction coking furnace shaft causes 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, real-time monitoring peephole pressure, and the control for dividing flue suction force is mended according to peephole pressure
Fill and correct, effectively control fuel type NOxGeneration.
Additionally, as in Fig. 5, because the fluctuation of coke-stove gas main pipe pressure and coke oven are frequently exchanged, causing 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.By 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 to combustion chamber supply
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, the variation tendency of coking state and flue temperature according to two neighboring carbonization chamber, for reality
When adjust heating gas flow.
Because two carbonization chambers are in different coking states, their coke pushing coaling the time more than being separated by 4~8 hours,
Carbonization chamber is in the different coking moment, and the heat of absorption is different, at the coking initial stage, it is necessary to evaporate substantial amounts of moisture and wave
Hair part, absorbs amount of heat, causes flue temperature to decline, and 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 sequence 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 for having；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 is 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 present invention, coking end time discriminatory analysis unit and coke maturity discriminatory analysis list are further comprises in the system
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 carbonization chamber maturation uniformity, and horizontally-arranged index is good, shows charge of coke transverse direction
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, coking end time curve reflect the overall ripe situation of coke and maturation in carbonization chamber when
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.
Below the system of nitrogen oxides in only elaborating the coke oven exhaust gas from Sources controlling of the invention by way of example,
This few example is only used for explanation principle of the invention and embodiments thereof, rather than limitation of the present invention, is not departing from this hair
In the case of bright spirit and scope, those skilled in the art can also make various modifications and improvement.Therefore, it is all equivalent
Technical scheme all should belong to scope of the invention and be limited by every claim of the invention.
Claims (5)
1. in a kind of coke oven exhaust gas from Sources controlling nitrogen oxides system, it is characterised in that the system includes：PLC controls are single
Unit, 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
Each carbonization chamber top, for the temperature in real-time monitoring flue；
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 of flue, in point flue real-time monitoring and the smoke components for controlling full stove；
Furnace roof peephole pressure monitoring unit, including installed in the high temperature resistant differential manometer of peephole, for real-time monitoring and control
The change of peephole pressure, the control according to peephole pressure to point flue suction force is supplemented and corrected；
Gas flow control unit, using preceding feedback mode control, by the accurate control of gas pressure and prediction regulation and control, for steady
Determine gas flow.
2. in the coke oven exhaust gas from Sources controlling according to claim 1 nitrogen oxides system, it is characterised in that the system
Also include single combustion chamber control unit, single combustion chamber control unit includes be arranged on the branch gas tube to combustion chamber supply two
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, the variation tendency of coking state and flue temperature according to two neighboring carbonization chamber is used for
Real-time adjustment heating gas flow.
3. in the coke oven exhaust gas from Sources controlling according to claim 1 nitrogen oxides system, 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. in the coke oven exhaust gas from Sources controlling according to claim 1 nitrogen oxides system, 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. in the coke oven exhaust gas from Sources controlling according to claim 1 nitrogen oxides system, 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112280570A (en) * | 2020-09-29 | 2021-01-29 | 唐山中润煤化工有限公司 | Method for controlling sulfur and nitrate in source of coke oven flue gas |
| CN112285158A (en) * | 2020-10-29 | 2021-01-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Device and method for testing combustion characteristics of metallurgical gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112280570A (en) * | 2020-09-29 | 2021-01-29 | 唐山中润煤化工有限公司 | Method for controlling sulfur and nitrate in source of coke oven flue gas |
| CN112285158A (en) * | 2020-10-29 | 2021-01-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Device and method for testing combustion characteristics of metallurgical gas |
| CN112285158B (en) * | 2020-10-29 | 2022-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Device and method for testing combustion characteristics of metallurgical gas |
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