CN116606663A - Coke oven flue gas denitration system - Google Patents
Coke oven flue gas denitration system Download PDFInfo
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- CN116606663A CN116606663A CN202310581062.5A CN202310581062A CN116606663A CN 116606663 A CN116606663 A CN 116606663A CN 202310581062 A CN202310581062 A CN 202310581062A CN 116606663 A CN116606663 A CN 116606663A
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- Prior art keywords
- flue gas
- temperature distribution
- temperature
- uniformity
- coke
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- 239000000571 coke Substances 0.000 title claims abstract description 119
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 239000003546 flue gas Substances 0.000 title claims abstract description 66
- 238000002485 combustion reaction Methods 0.000 claims abstract description 64
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 63
- 230000001105 regulatory effect Effects 0.000 claims abstract description 48
- 239000007789 gas Substances 0.000 claims abstract description 29
- 238000004458 analytical method Methods 0.000 claims abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 13
- 239000000523 sample Substances 0.000 claims description 6
- 238000004868 gas analysis Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 2
- 238000009792 diffusion process Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a flue gas denitration system of a coke oven, which relates to the technical field of denitration, and comprises: the system comprises a coke cake temperature analysis module, a flue gas double-depletion control module, a gas flow control module and a combustion chamber temperature detection module which are connected with a data terminal; the flue gas double-depletion control module comprises an induced draft fan, wherein the induced draft fan is used for leading out part of flue gas in the sub-flue from the sub-flue; the gas flow control module comprises a first premixing chamber, a second premixing chamber and a gas flow control module, wherein the first premixing chamber is used for mixing the flue gas with air, and the second premixing chamber is used for mixing the flue gas with coke oven gas; the data terminal is used for adjusting the temperature distribution uniformity of the coke cake when the temperature distribution uniformity of the coke cake exceeds a first preset range, and adjusting the temperature distribution uniformity of the flame path by adjusting the frequency of the induced draft fan and the opening of the flow regulating valve when the temperature distribution uniformity of the flame path in the combustion chamber exceeds a second preset range. The invention reduces the emission of nitrogen oxides.
Description
Technical Field
The invention relates to the technical field of denitration, in particular to a coke oven flue gas denitration system.
Background
The main pollutants of coke oven flue gas include nitrogen oxides (NO x ) Nitrogen oxides and sulfides are important sources of atmospheric pollution. Wherein NO x The method is divided into a rapid type, a fuel type and a thermal type. Thermal NO generated by combustion in coke oven combustion chamber x Occupies a major source. The temperature being thermal NO x Is a major factor in the generation of (a) a (b). Theoretically, NO when the temperature is higher than 1600 deg.c x And the nitrogen oxides are hardly generated when the nitrogen oxides are rapidly increased in an exponential law. It has been ascertained that the temperature in the combustion chamber of the coke oven should not be below 1350 c in order to ensure coke quality. Therefore, the uniformity of the temperature in the combustion chamber of the coke oven is ensured, local overheating is avoided, and the method is an important means for reducing nitrogen oxides.
The combustion phenomenon in the combustion chamber of the coke oven in the industry at present belongs to diffusion combustion, and the phenomenon of uneven combustion temperature and overhigh local combustion temperature exists, thereby causing thermal NO x Greatly increasing. This diffusion combustion is a widespread use of energy and has a bad influence on the environment. Because the vertical flame path of the coke oven has a long and narrow limited space structure, namely the height dimension of the vertical flame path is far larger than the transverse dimension of the vertical flame path, the combustion process in the vertical flame path basically occurs at the position of a fuel outlet at the bottom of the vertical flame path, and a local high-temperature phenomenon is formed in the vertical flame path. Excessive longitudinal temperature differences are detrimental to the formation of quality coke. In addition, the high temperature combustion process results in thermal NO x And a large amount of the water is generated, so that serious environmental pollution is caused, and the water becomes a difficult problem to be solved urgently at present.
Disclosure of Invention
The invention aims to provide a flue gas denitration system of a coke oven, which reduces the emission of nitrogen oxides.
In order to achieve the above object, the present invention provides the following solutions:
a coke oven flue gas denitration system comprising: the system comprises a data terminal, a coke cake temperature analysis module, a flue gas double-depletion control module, a gas flow control module and a combustion chamber temperature detection module, wherein the coke cake temperature analysis module, the flue gas double-depletion control module, the gas flow control module and the combustion chamber temperature detection module are connected with the data terminal;
the coke cake temperature analysis module is used for determining coke cake temperature distribution uniformity;
the flue gas double-depletion control module comprises an induced draft fan, wherein the induced draft fan is used for leading out part of flue gas in the branch flue from the branch flue;
the gas flow control module comprises a first premixing chamber, a second premixing chamber, a first flow regulating valve and a second flow regulating valve, wherein a first inlet of the first premixing chamber is connected with an outlet of the induced draft fan through the first flow regulating valve, a first inlet of the second premixing chamber is connected with an outlet of the induced draft fan through the second flow regulating valve, a second inlet of the first premixing chamber is used for inputting air, a second inlet of the second premixing chamber is used for inputting coke oven gas, and an outlet of the first premixing chamber and an outlet of the second premixing chamber are both connected with the combustion chamber;
the combustion chamber temperature detection module is used for detecting the temperature distribution uniformity of the flame path in the combustion chamber;
the data terminal is used for adjusting the uniformity of the temperature distribution of the coke cake when the uniformity of the temperature distribution of the coke cake exceeds a first preset range, and adjusting the uniformity of the temperature distribution of the flame path by adjusting the frequency of the induced draft fan, the opening of the first flow adjusting valve and the opening of the second flow adjusting valve when the uniformity of the temperature distribution of the flame path in the combustion chamber exceeds a second preset range.
Optionally, the coke cake temperature analysis module comprises a coke cake temperature uniformity analysis unit and a coke cake temperature detection probe positioned at each position of the coke cake; and the temperature signals detected by the coke cake temperature detection probe are sent to the coke cake temperature uniformity analysis unit, and the coke cake temperature uniformity analysis unit calculates coke cake temperature distribution uniformity according to the received temperature signals.
Optionally, the calculation formula of the coke cake temperature distribution uniformity is expressed as:
wherein θ c Indicating the uniformity of the temperature distribution of the coke cake, T i,j Represents the temperature of the ith focal spot, T m,j Indicating the average temperature of the coke cake.
Optionally, the outlet of the second premixing chamber is connected with a third flow regulating valve;
the data terminal comprises a coke cake temperature distribution uniformity adjusting unit, wherein the coke cake temperature distribution uniformity adjusting unit is used for adjusting the opening degree of the third flow adjusting valve or increasing the frequency of the induced draft fan when the deviation of the coke cake temperature distribution uniformity with the target coke maturity model exceeds 5%, and the deviation of the coke cake temperature distribution uniformity with the target coke maturity model is smaller than 5%.
Optionally, the calculation formula of the uniformity of the temperature distribution of the flame path is:
wherein θ h Indicating the uniformity of the temperature distribution of the flame path, T k Representing the temperature of the kth flame path measuring site, T ave Indicating the average temperature of the flame path.
Optionally, the data terminal includes a flame path temperature distribution uniformity adjustment unit, where the flame path temperature distribution uniformity adjustment unit is configured to, when the flame path temperature distribution uniformity is greater than 15%, increase the frequency of the induced draft fan, adjust the opening of the first flow adjustment valve and the opening of the second flow adjustment valve, so that the flue gas passing through the first flow adjustment valve and the second flow adjustment valve is in a set proportion until the flame path temperature distribution uniformity is less than 15%.
Optionally, a first flowmeter is arranged between the first flow regulating valve and the first inlet of the first premixing chamber, and a second flowmeter is arranged between the second flow regulating valve and the first inlet of the second premixing chamber.
Optionally, the flue gas analysis module is used for detecting the concentration of carbon monoxide and the concentration of nitrogen oxides in the flue gas separation channel and sending the detected concentration of carbon monoxide and the detected concentration of nitrogen oxides to a data terminal;
and the data terminal is also used for adjusting the frequency of the induced draft fan when the carbon monoxide concentration is greater than a first set value or when the nitrogen oxide concentration is greater than a second set value, and adjusting the opening of the first flow regulating valve and the opening of the second flow regulating valve to enable the flue gas passing through the first flow regulating valve and the second flow regulating valve to be in a set proportion until the carbon monoxide concentration is less than the first set value and the nitrogen oxide concentration is less than the second set value.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the invention, the induced draft fan, the first flow regulating valve and the second flow regulating valve are used for regulating the rate of the discharged flue gas of the sub-flue, regulating the temperature distribution uniformity of the coke cake and the temperature distribution uniformity of the flame path, recycling the flue gas discharged by the sub-flue, and reducing the discharge of nitrogen oxides.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a flue gas denitration system for a coke oven according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an entity structure in a flue gas denitration system of a coke oven according to an embodiment of the present invention.
Symbol description:
1-induced draft fan, 2-first flow control valve, 3-second flow control valve, 4-third flow control valve, 5-first flowmeter, 6-second flowmeter, 7-third flowmeter.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a flue gas denitration system of a coke oven, which reduces the emission of nitrogen oxides.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Example 1
As shown in fig. 1 and 2, the present embodiment provides a flue gas denitration system for a coke oven, including: a data terminal 101, and a coke cake temperature analysis module 102, a flue gas double depletion control module 103, a gas flow control module 104 and a combustion chamber temperature detection module 105 which are connected with the data terminal 101.
The cake temperature analysis module 102 is configured to determine cake temperature distribution uniformity.
The flue gas double-depletion control module 103 comprises an induced draft fan 1, wherein the induced draft fan 1 is used for leading out part of flue gas in the branch flue from the branch flue. The exiting flue gas enters the gas flow control module 104 through the recirculated flue gas adjustment valves (first flow adjustment valve 2 and second flow adjustment valve 3) and the recirculated flue gas flow meters (first flow meter 5 and second flow meter 6).
The gas flow control module 104 comprises a first premixing chamber, a second premixing chamber, a first flow regulating valve 2 and a second flow regulating valve 3, wherein a first inlet of the first premixing chamber is connected with an outlet of the induced draft fan 1 through the first flow regulating valve 2, a first inlet of the second premixing chamber is connected with an outlet of the induced draft fan 1 through the second flow regulating valve 3, a second inlet of the first premixing chamber is used for inputting air, a second inlet of the second premixing chamber is used for inputting coke oven gas, and an outlet of the first premixing chamber and an outlet of the second premixing chamber are both connected with the combustion chamber.
The first premixing chamber is used for mixing the flue gas and the air and inputting the mixture into the gas chamber. The second premixing chamber is used for mixing the flue gas and the coke oven gas and inputting the mixture into the gas chamber.
The coke oven gas can be regulated by a third flow regulating valve 4 and a third flowmeter 7, and the air flow can be regulated by the opening of a throttle. The air flow rate can be determined by the gas (gas) flow rate and the air excess coefficient, so as to change the opening of the air door.
The combustion chamber is composed of a plurality of flame paths with long and narrow limited space structures. Under the condition that the flue gas double-depletion control module 103 is not involved, the combustion process in the flame path belongs to the conventional diffusion combustion control combustion state, namely the chemical reaction rate is far higher than the component transfer rate, and a local high Wen Xianxiang is easily formed at the lamp cap position at the bottom of the flame path, so that a large amount of NO is generated x 。
The combustion chamber temperature detection module 105 is used for detecting temperature in a flame path, detecting temperature of a fuel gas inlet, detecting temperature of an air inlet and detecting temperature of recirculated flue gas.
The combustion chamber temperature detection module 105 is configured to determine a uniformity of a temperature distribution of the flame path within the combustion chamber based on the temperature within the flame path.
The data terminal 101 is configured to adjust the uniformity of the temperature distribution of the coke cake when the uniformity of the temperature distribution of the coke cake exceeds a first preset range, and adjust the uniformity of the temperature distribution of the flame path by adjusting the frequency of the induced draft fan 1, the opening of the first flow adjusting valve 2, and the opening of the second flow adjusting valve 3 when the uniformity of the temperature distribution of the flame path in the combustion chamber exceeds a second preset range.
The coke cake temperature analysis module 102 comprises a coke cake temperature uniformity analysis unit and coke cake temperature detection probes positioned at each position of the coke cake; and the temperature signals detected by the coke cake temperature detection probe are sent to the coke cake temperature uniformity analysis unit, and the coke cake temperature uniformity analysis unit calculates coke cake temperature distribution uniformity according to the received temperature signals.
The calculation formula of the coke cake temperature distribution uniformity is expressed as follows:
wherein θ c Indicating the uniformity of the temperature distribution of the coke cake, T i,j Represents the temperature of the ith focal spot, T m,j Indicating the average temperature of the coke cake.
Where n is the number of focal cake sites.
The outlet of the second premixing chamber is connected with a third flow regulating valve 4.
The data terminal 101 comprises a coke cake temperature distribution uniformity adjusting unit, which is used for adjusting the opening degree of the third flow adjusting valve 4 or adjusting the frequency of the induced draft fan 1 when the deviation of the coke cake temperature distribution uniformity from the target coke maturity model exceeds 5% (a first preset range), until the deviation of the coke cake temperature distribution uniformity from the target coke maturity model is less than 5%.
The calculation formula of the flame path temperature distribution uniformity is as follows:
wherein θ h Indicating the uniformity of the temperature distribution of the flame path, T k Representing the temperature of the kth flame path measuring site, T ave Indicating the average temperature of the flame path.
Wherein n' represents the number of flame path measurement sites.
The data terminal 101 comprises a flame path temperature distribution uniformity adjusting unit, wherein the flame path temperature distribution uniformity adjusting unit is used for adjusting the frequency of the induced draft fan 1 when the flame path temperature distribution uniformity is greater than 15% (second preset range), and adjusting the opening of the first flow adjusting valve 2 and the opening of the second flow adjusting valve 3 so that the flue gas passing through the first flow adjusting valve 2 and the second flow adjusting valve is in a set proportion until the flame path temperature distribution uniformity is less than 15%.
A first flow meter 5 is arranged between the first flow regulating valve 2 and the first inlet of the first premix chamber,
a second flowmeter 6 is arranged between the second flow regulating valve 3 and the first inlet of the second premix chamber.
The coke oven flue gas denitration system further comprises a flue gas analysis module for detecting the concentration of oxygen, carbon monoxide and nitrogen oxides in the flue gas separation channel, and sending the detected concentration of carbon monoxide and nitrogen oxides to the data terminal 101.
The data terminal 101 is further configured to, when the carbon monoxide concentration is greater than a first set value, or when the nitrogen oxide concentration is greater than a second set value, increase the frequency of the induced draft fan 1, and adjust the opening of the first flow rate adjusting valve 2 and the opening of the second flow rate adjusting valve 3, so that the flue gas passing through the first flow rate adjusting valve 2 and the second flow rate adjusting valve is in a set proportion until the carbon monoxide concentration is less than the first set value and the nitrogen oxide concentration is less than the second set value.
The data terminal 101 detects and controls a combustion chamber temperature detection module 105, a gas flow control module 104, a flue gas double-depletion control module 103 and a flue gas analysis module, and the detection and control adopt a time sequence control method.
The time sequence control method specifically comprises the following steps.
First sequence control: and the first timing controller measures the temperature of the coke cake on line in real time, and the temperature value of each position is fed back to the data terminal to analyze and calculate the temperature distribution uniformity of the coke cake.
Further, focal cake site temperature T i,j First, the target coke maturity model should be satisfied if T i,j The condition is not satisfied and the condition is not satisfied,and directly feeding back to the data terminal for debugging, analyzing and calculating the temperature distribution uniformity of the coke cake temperature after the target coke maturity model is met, and feeding back the result to the data terminal for next debugging.
And (3) second sequence control: and measuring the temperature of each flame path in the combustion chamber of the coke oven according to the temperature distribution uniformity result of the coke oven obtained by the first sequential control, and analyzing and calculating the temperature distribution uniformity of each flame path after the temperature value of each position is fed back to the data terminal, wherein the calculation result is a judgment mode of the combustion state.
Uniformity of flame path temperature distribution theta h <When 15%, dispersion combustion is formed in the flame path, and at the moment, the temperature distribution uniformity of the flame path is good, NO x The discharge amount is greatly reduced; uniformity of temperature distribution of flame path h >15% of the flame path combustion process is in a diffusion combustion control state, and NO x The discharge amount is greatly increased.
Third sequence control: the flue gas double-depletion control module is regulated according to the uniformity of the temperature distribution of the flame path, and when the uniformity theta of the temperature distribution of the flame path is high h >When 15%, the frequency of the induced draft fan is increased, the flow of the recirculated flue gas is increased, and then the recirculated flue gas is premixed with coke oven gas and air respectively according to a certain proportion through a regulating valve (a first flow regulating valve and a second flow regulating valve), and the mixture is uniformly mixed and enters a combustion chamber of a coke oven to participate in combustion reaction. Uniformity of temperature distribution of flame path h <The 15% discharge is greatly reduced.
Fourth sequence control: and (3) carrying out online real-time control on the coke oven gas and the air flow according to the uniformity of the temperature distribution of the flame path obtained by the third sequential control, and regulating the fuel flow through a regulating valve (a third flow regulating valve) and a flowmeter (a third flow regulating valve). The air flow can be regulated and controlled in real time by controlling the opening of the air door. With the increase of the flow rate of the recirculated flue gas under the third sequential control, the coke oven gas and the air are heated to different degrees, and at the same time, the coke oven gas and the air are diluted by the flue gas, and the combustible components and the oxygen concentration are reduced to different degrees, so that the chemical reaction rate in the combustion process is reduced, thereby leading to the conversion of the combustion process from the diffusion combustion state to the diffusion combustion state. At this time, due to the increase of the combustion reaction area and the participation of the heat energy of the recirculated flue gas, the consumption of the coke oven gas is reduced, and the coke oven gas can be regulated again according to the first, second and third sequential control to achieve the effect of energy conservation.
Fifth control sequence: the smoke components in the split flue are detected on line in real time, and the split flue is mainly used for O 2 CO and NO x Is detected. O (O) 2 The detection of the concentration is an important index for judging whether the excessive air dilutes the smoke concentration during combustion in the combustion chamber, and is also an important basis for converting the concentration. The detection of the CO emission can effectively judge whether the coke oven combustion chamber is fully combusted or not, so that incomplete combustion caused by overlarge flow of recirculated flue gas is avoided, and energy waste and environmental pollution are caused. When CO<At 100ppm, this indicates that the combustion is substantially complete; when CO is more than or equal to 100ppm, the combustion is insufficient, and the data terminal regulates and controls according to a third control sequence in sequence; detection of NOx emissions may determine combustion status from another aspect when NO x <When the amount of the nitrogen is 100ppm, the combustion process is in a dispersion combustion control state, and the coke oven combustion chamber realizes ultralow NO x Discharging; when NO x And when the pressure is more than or equal to 100ppm, the combustion process is in a diffusion combustion control state, and the data terminal enters the second control sequence again and is regulated and controlled sequentially according to the result.
Compared with the existing conventional diffusion combustion mode, the diffusion combustion process under the control of double depletion of the flue gas has more uniform temperature distribution in the coke oven combustion chamber, thereby realizing NO x Is less than 100 ppm.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the system of the present invention and its core ideas; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (8)
1. A coke oven flue gas denitration system, comprising: the system comprises a data terminal, a coke cake temperature analysis module, a flue gas double-depletion control module, a gas flow control module and a combustion chamber temperature detection module, wherein the coke cake temperature analysis module, the flue gas double-depletion control module, the gas flow control module and the combustion chamber temperature detection module are connected with the data terminal;
the coke cake temperature analysis module is used for determining coke cake temperature distribution uniformity;
the flue gas double-depletion control module comprises an induced draft fan, wherein the induced draft fan is used for leading out part of flue gas in the branch flue from the branch flue;
the gas flow control module comprises a first premixing chamber, a second premixing chamber, a first flow regulating valve and a second flow regulating valve, wherein a first inlet of the first premixing chamber is connected with an outlet of the induced draft fan through the first flow regulating valve, a first inlet of the second premixing chamber is connected with an outlet of the induced draft fan through the second flow regulating valve, a second inlet of the first premixing chamber is used for inputting air, a second inlet of the second premixing chamber is used for inputting coke oven gas, and an outlet of the first premixing chamber and an outlet of the second premixing chamber are both connected with the combustion chamber;
the combustion chamber temperature detection module is used for detecting the temperature distribution uniformity of the flame path in the combustion chamber;
the data terminal is used for adjusting the uniformity of the temperature distribution of the coke cake when the uniformity of the temperature distribution of the coke cake exceeds a first preset range, and adjusting the uniformity of the temperature distribution of the flame path by adjusting the frequency of the induced draft fan, the opening of the first flow adjusting valve and the opening of the second flow adjusting valve when the uniformity of the temperature distribution of the flame path in the combustion chamber exceeds a second preset range.
2. The coke oven flue gas denitration system of claim 1, wherein the coke cake temperature analysis module comprises a coke cake temperature uniformity analysis unit and coke cake temperature detection probes positioned at each position of a coke cake; and the temperature signals detected by the coke cake temperature detection probe are sent to the coke cake temperature uniformity analysis unit, and the coke cake temperature uniformity analysis unit calculates coke cake temperature distribution uniformity according to the received temperature signals.
3. The coke oven flue gas denitration system of claim 2, wherein a calculation formula of the coke cake temperature distribution uniformity is expressed as:
wherein θ c Indicating the uniformity of the temperature distribution of the coke cake, T i,j Represents the temperature of the ith focal spot, T m,j Indicating the average temperature of the coke cake.
4. The coke oven flue gas denitration system according to claim 1, wherein the outlet of the second premixing chamber is connected with a third flow regulating valve;
the data terminal comprises a coke cake temperature distribution uniformity adjusting unit, wherein the coke cake temperature distribution uniformity adjusting unit is used for adjusting the opening degree of the third flow adjusting valve or increasing the frequency of the induced draft fan when the deviation of the coke cake temperature distribution uniformity with the target coke maturity model exceeds 5%, and the deviation of the coke cake temperature distribution uniformity with the target coke maturity model is smaller than 5%.
5. The coke oven flue gas denitration system of claim 1, wherein the flame path temperature distribution uniformity has a calculation formula:
wherein θ h Indicating the uniformity of the temperature distribution of the flame path, T k Indicating the temperature of the kth flame path measurement siteDegree, T ave Indicating the average temperature of the flame path.
6. The coke oven flue gas denitration system according to claim 1, wherein the data terminal comprises a flame path temperature distribution uniformity adjustment unit, the flame path temperature distribution uniformity adjustment unit is configured to increase the frequency of the induced draft fan when the flame path temperature distribution uniformity is greater than 15%, and adjust the opening of the first flow adjustment valve and the opening of the second flow adjustment valve so that the flue gas passing through the first flow adjustment valve and the second flow adjustment valve is in a set proportion until the flame path temperature distribution uniformity is less than 15%.
7. The coke oven flue gas denitration system of claim 1, wherein a first flowmeter is disposed between the first flow regulating valve and the first inlet of the first premix chamber, and a second flowmeter is disposed between the second flow regulating valve and the first inlet of the second premix chamber.
8. The coke oven flue gas denitration system of claim 1, further comprising a flue gas analysis module for detecting carbon monoxide concentration and nitrogen oxide concentration in the tap flue and transmitting the detected carbon monoxide concentration and nitrogen oxide concentration to a data terminal;
and the data terminal is also used for adjusting the frequency of the induced draft fan when the carbon monoxide concentration is greater than a first set value or when the nitrogen oxide concentration is greater than a second set value, and adjusting the opening of the first flow regulating valve and the opening of the second flow regulating valve to enable the flue gas passing through the first flow regulating valve and the second flow regulating valve to be in a set proportion until the carbon monoxide concentration is less than the first set value and the nitrogen oxide concentration is less than the second set value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310581062.5A CN116606663A (en) | 2023-05-18 | 2023-05-18 | Coke oven flue gas denitration system |
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| CN202310581062.5A CN116606663A (en) | 2023-05-18 | 2023-05-18 | Coke oven flue gas denitration system |
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| CN116606663A true CN116606663A (en) | 2023-08-18 |
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| CN202310581062.5A Pending CN116606663A (en) | 2023-05-18 | 2023-05-18 | Coke oven flue gas denitration system |
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| CN (1) | CN116606663A (en) |
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2023
- 2023-05-18 CN CN202310581062.5A patent/CN116606663A/en active Pending
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