CN104830351A - Control system and method for reducing oxynitride in coke oven waste gas - Google Patents
Control system and method for reducing oxynitride in coke oven waste gas Download PDFInfo
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- CN104830351A CN104830351A CN201510211984.2A CN201510211984A CN104830351A CN 104830351 A CN104830351 A CN 104830351A CN 201510211984 A CN201510211984 A CN 201510211984A CN 104830351 A CN104830351 A CN 104830351A
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Abstract
A control system and method for reducing oxynitride in coke oven waste gas are disclosed. The control system comprises a coke oven, a temperature detection system, a heating automatic control system, a coking end time automatic judging model, a coking coal maturity model, a target coke oven flue temperature model, a gas flow control unit, and a sub-flue suction control system. The control method comprises the following steps: detecting the temperature of raw gas in a coke oven, the online flue temperature, and coke cake temperature by a temperature sensing probe, sending the raw gas temperature to the coking end time automatic judging model and coking coal maturity model; sending the CI and K values to the target coke oven flue temperature model by the coking end time automatic judging model and coking coal maturity model, sending the target coke oven flue temperature (Ts) to the heating automatic control system by the target coke oven flue temperature model; and controlling the heating automatic control system to control the gas flow control unit and the sub-flue suction control system to feed gas and sub-flue waste gas into the coke oven. The provided control system and method can prominently reduce the oxynitride discharge, and have the advantages of easy promotion and application, and low investment and operation cost.
Description
Technical field
The invention belongs to coking by coke oven technical field of automation, specifically, relate to a kind of Controlling System and the control method thereof that reduce oxynitride.
Background technology
Oxynitride, as pollutant effulent, all creates tremendous influence to human health and ecotope.In human health, oxynitride all can produce hormesis consumingly to the eyes of people and respiratory tract, can cause bronchitis and produce rotten candle to lung time serious.In ecotope, oxynitride causes one of acid rain, Greenhouse effect and essential substance of damaging the ozone layer, and oxynitride is also the main component of current China haze weather simultaneously.
The high speed development of China's ferrous metallurgical industry in decades, make as blast furnace ironmaking provides the coking industry of important source material to be developed rapidly, current China has become coke production state the biggest in the world and export State.Coking is a complicated technological process, is the energy consumption rich and influential family in metallurgical industry, is also simultaneously exhaust gas emission, especially one of important sources of discharging of oxynitride (NOx).In coking production process, the oxynitride that combustion gas generates when coke oven vertical flame path burns, mainly nitrogen protoxide (NO) accounts for 95%, nitrogen peroxide (NO
2) be about 5%.In order to control the further deterioration of atmospheric environment, the strict environmental protection standard that country formulates coking industry: the i.e. NOx of coke oven smoke stack emission must be less than 500mg/m
3, and this standard to be enforced in 2015.
The patent No. is that the Chinese patent of ZL200710120484.3 discloses a kind of automation control method for coke oven heating, the method is by measuring coke oven temperature, and use coke oven heating gas flow model and point flue suction force model, calculate heating gas flow Q and point flue suction force a, and respectively both controlled and realize the control to coke oven temperature.The patent No. is the determination methods that the Chinese patent of ZL201210107382.9 discloses a kind of coke ripening degree, coke ripening degree K is defined as by the method (τ c-τ m)/τ c, τ c: coking cycles, to the time that coke pushing terminates from coalingging, unit is minute; τ m: fire falls the time, refers to the time that raw gas temperature peaks from coalingging, and unit is minute; (τ c – τ m) represents the cold stoking time, and unit is minute, the time of the coke pushing that peaks from raw gas temperature; Coke ripening degree controls near 20% more applicable, if K=20% ± 2%, then coke ripening degree is moderate.These patented technologies all can not reduce the oxynitride in coke oven exhaust gas.
To the control method of coking industry oxynitride, two kinds of approach can be divided into according to combustion processes: one, burning in control, two, burning after control.Controlling main technique means after burning is denitrating flue gas, namely flue gases of cock oven is released, be heated to 400-500 DEG C, then under the effect of catalyzer with ammonia generation chemical reaction, and then slough the NOx in flue gas, this method one-time investment is very large, about needs more than 3,000 ten thousand yuan, and running cost is also very high, about annual operating cost is not less than 5,000,000 yuan, is an expense being difficult to bear for struggling at present being full of/losing the coal chemical enterprise on line.
Summary of the invention
Object of the present invention will solve the deficiencies in the prior art exactly, a kind of Controlling System and the control method thereof that significantly can reduce oxynitride in the reduction coke oven exhaust gas of discharged nitrous oxides are provided, reduce flue flame high-temperature zone temperature by the concentration of oxygen in dilution combustion-supporting gas (air) to reach and reduce oxynitride in coke oven exhaust gas, be easy to apply, cost of investment and running cost low.
Technical scheme of the present invention is achieved like this: a kind of Controlling System reducing oxynitride in coke oven exhaust gas, comprise coke oven 1, system for detecting temperature 2, heating automatic control system 3, fire fall time automatic decision model 4, coking coal Capability Maturity Model 5, target coke oven fire path temperature model 6, gas flow control unit 8, be characterized in: also comprise a point attraction force control of smoke flue system 7; Wherein:
Described system for detecting temperature 2 comprises temperature-sensing probe, thermopair, optical fiber and infrared optical fiber instrument;
Described heating automatic control system 3 comprises online fire path temperature in raw gas temperature detection in coke oven, coke oven and detects and charge of coke temperature detection;
Fire falls time automatic decision model 4: at process of coking, produce a large amount of raw gass, and raw gas, can to fire time automatic decision model by measuring raw gas temperature variation according to certain rule change in the different time sections of coking cycle;
CI＝Tc/Tm
CI-fire falls the time
Tc-coking cycles, min
Tm-reaches the time of maximum value from coalingging to raw gas temperature, min
Coking coal Capability Maturity Model 5:
K＝(T
c-T
m)/T
c
K: coking coal ripening degree
A described point attraction force control of smoke flue system 7 controls a point flue suction force to reach by detecting the factors such as heating gas flow, fire path temperature, systemic resistance, shutter aperture, air coefficient.
Further, described blower fan and a point flue are provided with two.
Further, described system for detecting temperature (2) adopts infrared temperature measurement apparatus to carry out thermometric.
A kind of control method reducing the Controlling System of oxynitride in coke oven exhaust gas, be characterized in: the steps include: that system for detecting temperature 2 checks the temperature of raw gas (comprising hydrogen, carbon monoxide, methane etc.) in coke oven 1, online fire path temperature and charge of coke temperature by temperature-sensing probe, raw gas Temperature Feedback to be fallen time automatic decision model 4 and coking coal Capability Maturity Model 5 to fire, must fire time CI and coking coal ripening degree K; CI and K value is fed back to target coke oven fire path temperature model 6 by fall time automatic decision model 4 and coking coal Capability Maturity Model 5 of fire, revises, obtain target coke oven fire path temperature Ts in conjunction with coal blending moisture and coking cycles; Target coke oven fire path temperature Ts is fed back to heating automatic control system 3 by target coke oven fire path temperature model 6; Heating automatic control system 3 controls gas flow control unit 8 and a point attraction force control of smoke flue system 7 carries coal gas and point stack gases in coke oven 1;
According to the detection of raw gas temperature in coke oven in described system for detecting temperature 2 with when coking cycles is determined, obtain described fire and to fall time CI and coking coal Capability Maturity Model K; Detect and charge of coke temperature detection according to online fire path temperature in coke oven in system for detecting temperature 2, and coal blending moisture and coking cycles, determine target coke oven fire path temperature model 6:Ts=Tf+F1+F2+F3;
Ts: target coke oven fire path temperature;
Tf: target coke oven fire path temperature empirical value;
F1: the fire of target coke oven fire path temperature falls time complexity curve value;
F2: the coal blending moisture modified value of target coke oven fire path temperature;
F3: the coking cycles modified value of target coke oven fire path temperature.
Adopt technical scheme provided by the invention, compared with existing known technology, there is following unusual effect:
1) discharge of oxynitride is significantly reduced.
2) cost of investment is low.
3) zero run cost.
4) reasonable in design, be easy to apply.
Accompanying drawing explanation
Fig. 1 is the Controlling System principle schematic of oxynitride in reduction coke oven exhaust gas of the present invention.
Fig. 2 is Controlling System schematic block diagram of the present invention.
In figure: 1---coke oven; 2---system for detecting temperature; 3---heating automatic control system; 4---fire falls time automatic decision model; 5---coking coal Capability Maturity Model; 6---target coke oven fire path temperature model; 7---point attraction force control of smoke flue system; 8---gas flow control unit.
Specific embodiments
Reducing in coke oven exhaust gas the most effective means of oxynitride is control NOx in combustion.In coking production process, the oxynitride that combustion gas generates when coke oven vertical flame path burns, mainly nitrogen protoxide (NO), accounts for 95%, and nitrogen peroxide (NO2) is about 5%.
Show according to our research, oxynitride in coking production process produces major part and is mostly to cause due to high temperature.The method controlling flame temperature has two kinds, the first is the concentration of combustiblecomponents in fuel diluted, and the second is the concentration of oxygen in dilution combustion-supporting gas (air), allows fuel smoulder in quirk, so both can reduce the concentration of NOx, coke oven can have been improved again high to heating uniformity.Coal gas and air mix in a combustion chamber, burn, the heat produced is delivered in coking chamber by furnace wall, the temperature of quirk is periodically variable, the flame temperature of upstream is high, and the temperature of downdraft is low, coke pushing front and back temperature of coalingging is high, and after coalingging, 4-6 hour temperature is low, and the temperature difference can reach about 60 DEG C.The present invention is exactly by diluting the concentration of oxygen in combustion-supporting gas (air) to reach the object reducing flue flame high-temperature zone temperature.
A kind of Controlling System reducing oxynitride in coke oven exhaust gas of the present invention, comprise coke oven 1, system for detecting temperature 2, heating automatic control system 3, fire fall time automatic decision model 4, coking coal Capability Maturity Model 5, target coke oven fire path temperature model 6, gas flow control unit 8, also comprise a point attraction force control of smoke flue system 7; Wherein:
Described system for detecting temperature 2 comprises temperature-sensing probe, thermopair, optical fiber and infrared optical fiber instrument;
Described heating automatic control system 3 comprises online fire path temperature in raw gas temperature detection in coke oven, coke oven and detects and charge of coke temperature detection;
Fire falls time automatic decision model 4: at process of coking, produce a large amount of raw gass, and raw gas, can to fire time automatic decision model by measuring raw gas temperature variation according to certain rule change in the different time sections of coking cycle;
CI＝Tc/Tm
CI-fire falls the time
Tc-coking cycles, min
Tm-reaches the time of maximum value from coalingging to raw gas temperature, min
Coking coal Capability Maturity Model 5:
K＝(T
c-T
m)/T
c
K: coking coal ripening degree
A described point attraction force control of smoke flue system 7 controls a point flue suction force to reach by detecting the factors such as heating gas flow, fire path temperature, systemic resistance, shutter aperture, air coefficient.
Described blower fan and a point flue are provided with two.
Described system for detecting temperature (2) adopts infrared temperature measurement apparatus to carry out thermometric.
A kind of control method reducing the Controlling System of oxynitride in coke oven exhaust gas, the steps include: that system for detecting temperature 2 checks the temperature of raw gas (comprising hydrogen, carbon monoxide, methane etc.) in coke oven 1, online fire path temperature and charge of coke temperature by temperature-sensing probe, raw gas Temperature Feedback to be fallen time automatic decision model 4 and coking coal Capability Maturity Model 5 to fire, must fire time CI and coking coal ripening degree K; CI and K value is fed back to target coke oven fire path temperature model 6 by fall time automatic decision model 4 and coking coal Capability Maturity Model 5 of fire, revises, obtain target coke oven fire path temperature Ts in conjunction with coal blending moisture and coking cycles; Target coke oven fire path temperature Ts is fed back to heating automatic control system 3 by target coke oven fire path temperature model 6; Heating automatic control system 3 controls gas flow control unit 8 and a point attraction force control of smoke flue system 7 carries coal gas and point stack gases in coke oven 1;
According to the detection of raw gas temperature in coke oven in described system for detecting temperature 2 with when coking cycles is determined, obtain described fire and to fall time CI and coking coal Capability Maturity Model K; Detect and charge of coke temperature detection according to online fire path temperature in coke oven in system for detecting temperature 2, and coal blending moisture and coking cycles, determine target coke oven fire path temperature model 6:Ts=Tf+F1+F2+F3;
Ts: target coke oven fire path temperature;
Tf: target coke oven fire path temperature empirical value;
F1: the fire of target coke oven fire path temperature falls time complexity curve value;
F2: the coal blending moisture modified value of target coke oven fire path temperature;
F3: the coking cycles modified value of target coke oven fire path temperature.
Claims (4)
1. one kind is reduced the Controlling System of oxynitride in coke oven exhaust gas, comprise coke oven (1), system for detecting temperature (2), heating automatic control system (3), fire fall time automatic decision model (4), coking coal Capability Maturity Model (5), target coke oven fire path temperature model (6), gas flow control unit (8), it is characterized in that: also comprise a point attraction force control of smoke flue system (7); Wherein:
Described system for detecting temperature (2) comprises temperature-sensing probe, thermopair, optical fiber and infrared optical fiber instrument;
Described heating automatic control system (3) comprises online fire path temperature in raw gas temperature detection in coke oven, coke oven and detects and charge of coke temperature detection;
Fire falls time automatic decision model (4): at process of coking, produce a large amount of raw gass, raw gas, can to fire time automatic decision model by measuring raw gas temperature variation according to certain rule change in the different time sections of coking cycle
CI＝Tc/Tm
CI-fire falls the time
Tc-coking cycles, min
Tm-reaches the time of maximum value from coalingging to raw gas temperature, min
Coking coal Capability Maturity Model (5):
K＝(T
c-T
m)/T
c
K: coking coal ripening degree
A described point attraction force control of smoke flue system (7) controls a point flue suction force to reach by detecting the factors such as heating gas flow, fire path temperature, systemic resistance, shutter aperture, air coefficient.
2. a kind of Controlling System reducing oxynitride in coke oven exhaust gas according to claim 1, is characterized in that: described blower fan and a point flue are provided with two.
3. a kind of Controlling System reducing oxynitride in coke oven exhaust gas according to claim 1, is characterized in that: described system for detecting temperature (2) adopts infrared temperature measurement apparatus to carry out thermometric.
4. one kind is reduced the control method of the Controlling System of oxynitride in coke oven exhaust gas as claimed in claim 1, it is characterized in that: the steps include: that system for detecting temperature (2) checks the temperature of coke oven (1) interior raw gas (comprising hydrogen, carbon monoxide, methane etc.), online fire path temperature and charge of coke temperature by temperature-sensing probe, raw gas Temperature Feedback to be fallen time automatic decision model (4) and coking coal Capability Maturity Model (5) to fire, must fire time CI and coking coal ripening degree K; CI and K value is fed back to target coke oven fire path temperature model (6) by fall time automatic decision model (4) and coking coal Capability Maturity Model (5) of fire, revise in conjunction with coal blending moisture and coking cycles, obtain target coke oven fire path temperature Ts; Target coke oven fire path temperature Ts is fed back to heating automatic control system (3) by target coke oven fire path temperature model (6); Heating automatic control system (3) controls gas flow control unit (8) and point attraction force control of smoke flue system (7) conveying coal gas and point stack gases in coke oven (1);
According to the detection of raw gas temperature in coke oven in described system for detecting temperature (2) with when coking cycles is determined, obtain described fire and to fall time CI and coking coal Capability Maturity Model K; Detect and charge of coke temperature detection according to fire path temperature online in coke oven in system for detecting temperature (2), and coal blending moisture and coking cycles, determine target coke oven fire path temperature model (6): Ts=Tf+F1+F2+F3;
Ts: target coke oven fire path temperature;
Tf: target coke oven fire path temperature empirical value;
F1: the fire of target coke oven fire path temperature falls time complexity curve value;
F2: the coal blending moisture modified value of target coke oven fire path temperature;
F3: the coking cycles modified value of target coke oven fire path temperature.
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Cited By (4)
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| CN105797562A (en) * | 2016-05-05 | 2016-07-27 | 济南冶金化工设备有限公司 | Two-section type double-ammonia-process integrated desulfurization and denitration system for coking flue gas |
| 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 |
| CN107557030A (en) * | 2017-10-18 | 2018-01-09 | 南京沪友冶金机械制造有限公司 | A kind of associated detecting method of coke oven coke oven uprising tube and charging hole lid state |
| 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 |
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Application publication date: 20150812 |