CN115301056A - Denitration flue gas interlocking control system and denitration process - Google Patents
Denitration flue gas interlocking control system and denitration process Download PDFInfo
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Abstract
The invention discloses a denitration flue gas interlocking control system and a denitration process, and relates to the technical field of flue gas denitration, on the basis of multi-thread mixed flue gas denitration operation according to a quantitative proportion, internal and external temperature parameters of flue gas, a pulled flue gas flow velocity parameter and a multi-flue gas mixed treatment content parameter are monitored and collected in parallel through a single thread in multi-thread, then, each parameter is subjected to interlocking deepening analysis and treatment to generate various corresponding signals, system components are sequentially controlled through various signals, a denitration system is in an optimal denitration state, the denitration rate is ensured to be optimal, time collection of each signal is also used for deepening monitoring treatment and prejudging whether the periodicity needs maintenance work, so that the long-term stable operation of the system is ensured, the intelligent degree of the system is higher, resources are saved more, and the related cost in the operation process is reduced.
Description
Technical Field
The invention relates to the technical field of flue gas denitration, in particular to a denitration flue gas interlocking control system and a denitration process.
Background
In order to prevent the environment pollution caused by excessive NOx generated after the coal in the boiler is combusted, the coal is subjected to denitration treatment. The method comprises denitration before combustion, denitration during combustion and denitration after combustion, and the mainstream process in the world comprises the following steps: SCR and SNCR. The two processes are not much different except that the reaction temperature is lower than that of SNCR due to the use of the catalyst in SCR, but the investment of SCR is at least several times or even more than 10 times that of SNCR in view of both construction cost and operation cost; the traditional denitration direct single-flue gas denitration method has the advantages that different temperatures are required to be adjusted to compensate the temperature (increase the temperature or reduce the temperature) of different types of flue gas due to different temperatures of different types of flue gas, a large amount of energy is wasted in the temperature compensation process, the service life of a catalyst is ensured in order to meet the requirement of safe operation, a strong temperature control system is required to cause more complex temperature control, multiple groups of parameters cannot be monitored and locked for analysis, multithread system operation of optimal dynamic denitration cannot be realized, the function of periodical automatic or manual maintenance is not required to be synchronously realized through deep monitoring, intelligent pre-detection is carried out, and the intelligent degree of a denitration system is low;
in view of the above technical drawbacks, a solution is proposed.
Disclosure of Invention
The invention aims to: on the basis of multi-thread mixed flue gas denitration operation according to a quantitative proportion, the system acquires internal and external temperature parameters of flue gas, a drawn flue gas flow velocity parameter and a multi-flue gas mixed processing content parameter through parallel monitoring of a single thread in multi-thread, then carries out linkage deepening analysis processing on each parameter to generate various corresponding signals, sequentially controls system components through various signals, enables a denitration system to be in an optimal denitration state, ensures that the denitration rate is optimal, and also carries out deepening monitoring processing and pre-judges whether the periodicity needs maintenance work or not through time acquisition of each signal, thereby ensuring long-term stable operation of the system, ensuring higher intelligent degree of the system, saving resources and reducing related cost in the operation process;
in order to achieve the purpose, the invention adopts the following technical scheme:
denitration flue gas interlock control system has the desulfurizing tower based on pipeline through connection, includes:
the single-path denitration unit is used for mixing and locking denitration on various flue gases;
the denitration collecting unit is used for collecting real-time distribution condition information of flue gas in the denitration process and real-time temperature information in the denitration process, collecting signal time variable information in the operation process of the denitration monitoring unit and sending the information to the data storage unit for storage;
the data storage unit is used for receiving and storing information;
the denitration monitoring unit acquires real-time distribution information of flue gas in the denitration process and real-time temperature information in the denitration process through the data storage unit, carries out linkage processing on the real-time distribution information and the real-time temperature information to generate a first traction flow rate signal, a second traction flow rate signal, a first temperature control signal, a second temperature control signal and an interlocking control signal, and controls the work of a single-channel denitration unit component for realizing optimal denitration operation corresponding to the signals;
the depth monitoring unit is used for acquiring signal time variable information in the operation process of the denitration monitoring unit through the data storage unit, performing depth optimization processing on the signal time variable information and generating a periodic maintenance signal, and the periodic maintenance signal is generated and used for automatically maintaining the denitration system;
the real-time distribution information of the flue gas in the denitration process comprises the average flow velocity of the traction flue gas in the denitration process, the mixed flue gas content of the flue gas of the rotary kiln in the denitration process, the mixed flue gas content of the flue gas of the electric furnace in the denitration process and the real-time denitration amount of the mixed flue gas in the denitration process, and the real-time temperature information in the denitration process comprises the average temperature value when the flue gas is mixed in the hot blast furnace and the average temperature value outside the hot blast furnace.
Furthermore, the one way denitration unit multithread sets up and through pipeline through connection desulfurizing tower, and the one way denitration unit includes the hot-blast furnace, the air inlet department through connection of hot-blast furnace has a tip of rotary kiln tobacco pipe and the two smoke pipes of electric stove, the gas outlet department of hot-blast furnace has through connection in proper order through the pipeline cyclone, denitration reactor, booster fan, drying kiln, electrostatic precipitator and main fan, and the one end that electrostatic precipitator was kept away from to the main fan is through pipeline through connection in the air inlet department of desulfurizing tower, another tip through connection of the two smoke pipes of electric stove is on the pipeline between denitration reactor and booster fan, and the electric throttle valve is all installed at the both ends of the two smoke pipes of electric stove.
Further, the chain treatment process of the denitration monitoring unit is as follows:
respectively calibrating the average flow speed of traction smoke in the denitration process, the mixed smoke content of rotary kiln smoke in the denitration process, the content of smoke of an electric furnace smoke entering a hot blast stove in the denitration process, the real-time denitration amount of the mixed smoke in the denitration process, the average temperature value when the smoke is mixed in the hot blast stove and the average temperature value outside the hot blast stove as QV, ZY, DY, HY, RW and HW;
acquiring a preset flow rate threshold value QV corresponding to the average flow rate QV of traction flue gas in the denitration process, generating a first traction flow rate signal when QV is less than Qvmin, automatically controlling the booster fan and the main fan to work and improving the power of the booster fan and the main fan after the traction flow rate signal is generated until Qvmin is less than QV and Qvmax, and automatically controlling the booster fan and the main fan to work and reducing the working power of the booster fan and the main fan after a second traction flow rate signal is generated until Qvmin is less than QV and Qvmax; the average flow velocity QV of the traction flue gas in the denitration process is always kept within a preset flow velocity threshold value QV, so that the denitration overtime cannot be caused too slowly, the efficiency is low, and incomplete denitration cannot be caused too quickly, so that the denitration is in an optimal flowing state, and the efficiency is optimal;
when Qvmin is less than QV and less than Qvmax, obtaining a constant temperature value HW of the smoke through a formula HW = e2 (RW-e 1 HW), comparing the constant temperature value HW of the smoke with a preset temperature threshold Hw, and when the HW is greater than the Hwmax, generating a first temperature control signal, and automatically controlling the temperature until Hwmin is less than HW and less than or equal to Hwmax; when HW is less than or equal to the value Hwmin, a second temperature control signal is generated, and the temperature is automatically controlled until Hwmin is less than or equal to the value Hwmax;
wherein the higher the average temperature value HW outside the hot blast stove is, the lower the heat dissipation capacity of the hot blast stove and the flue gas is; when the average temperature value HW outside the hot blast stove is lower, the heat dissipation capacity of the hot blast stove and the flue gas is higher, temperature change needs to be compensated, the temperature is ensured to be constant, and the nitrified substances in the flue gas are in the optimal separation state;
when Hwmin < HW < Hwmax, the formula is followed
Obtaining a real-time constant temperature and constant quantity variable A of the mixed flue gas;
and then comparing the real-time constant temperature constant variable A of the mixed flue gas with a corresponding preset value a, generating an interlocking control signal when a is less than A, otherwise, not generating a control signal, and automatically performing shunt control on the flue gas of the electric furnace after generating the interlocking control signal to reduce the real-time content of the flue gas entering the hot blast stove.
Further, the signal time variable information in the operation process of the denitration monitoring unit is composed of the total generation duration of the first traction flow rate signal, the total generation duration of the second traction flow rate signal, the total generation duration of the first temperature control signal, the total generation duration of the second temperature control signal and the total generation duration of the interlocking control signal.
Further, the specific process of the depth optimization processing of the depth monitoring unit is as follows:
multiplying the total generation time length of the first traction flow speed signal, the total generation time length of the second traction flow speed signal, the total generation time length of the first temperature control signal, the total generation time length of the second temperature control signal and the total generation time length of the interlocking control signal with corresponding imbalance constants to obtain corresponding imbalance values, quantizing a plurality of imbalance values to obtain standard deviation and average values of the imbalance values, marking the standard deviation and the average values of the imbalance values as T1 and T2 respectively, then judging whether the denitration system needs to be periodically detected or not according to the size of the periodic imbalance values of the imbalance values, and generating a periodic maintenance signal needing to be maintained in the period when B is greater than B; otherwise, the control signal which does not need maintenance in the period is not generated.
The denitration process of the denitration flue gas interlocking control system comprises the following specific process steps:
the method comprises the following steps: quantitatively mixing and inputting rotary kiln flue gas or electric furnace flue gas into a hot blast stove, mixing and heating the electric furnace flue gas and the rotary kiln flue gas by the hot blast stove to form high-temperature mixed gas, enabling the high-temperature mixed gas to enter a cyclone dust collector through a pipeline to remove fixed particles and then enter a denitration reactor, enabling the high-temperature mixed gas to be denitrated by the denitration reactor and then mixed with the flue gas at the other end of a two-way smoke pipe of the electric furnace, enabling the denitrated high-temperature mixed gas to flow through a drying kiln and an electrostatic dust collector through traction of a booster fan and suction of a main fan to form constant-speed denitration clean gas, injecting the constant-speed denitration clean gas into a desulfurization tower through a pipeline, and performing desulfurization treatment on the constant-speed denitration clean gas;
step two: the denitration collecting unit collects real-time distribution condition information of flue gas in the denitration process and real-time temperature information in the denitration process and sends the real-time distribution condition information and the real-time temperature information to the data storage unit for storage; then, the denitration monitoring unit carries out linkage processing on the real-time distribution condition information of the flue gas in the denitration process and the real-time temperature information in the denitration process and generates various linkage signals, so that the denitration system is controlled in a grading mode to be gradually in an optimal operation state and is kept;
step three: after the denitration system keeps the optimal operation state, the information acquisition unit acquires the time variable information of the signal in the operation process of the denitration monitoring unit again and sends the time variable information to the data storage unit for storage, and at the moment, the deep monitoring unit acquires the time variable information in the operation process of the denitration monitoring unit in the recent time period, performs deep optimization processing on the time variable information and generates a periodical maintenance signal for pre-judging the periodical maintenance needed to be automatically performed on the denitration system, so that the operation efficiency of the denitration system is ensured and the frequency of the periodical maintenance is reduced;
step four: and applying the processes from the first step to the third step to the multithreading cooperative deep monitoring denitration operation.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
on the basis of multi-thread mixed flue gas denitration operation according to a quantitative proportion, the system acquires internal and external temperature parameters of flue gas, a drawn flue gas flow velocity parameter and a multi-flue gas mixed processing content parameter through parallel monitoring of a single thread in multi-thread, then carries out linkage deepened analysis processing on each parameter to generate various corresponding signals, sequentially controls system components through various signals, enables a denitration system to be in an optimal denitration state, ensures that the denitration rate is optimal, and also carries out deepened monitoring processing and prejudges whether the periodicity needs maintenance work or not through time acquisition of each signal, thereby ensuring long-term stable operation of the system, enabling the intellectualization degree of the system to be higher, saving resources, reducing related cost in the operation process, and solving the problems that the traditional system is low in intellectualization degree, cannot monitor and lock analysis processing on multiple groups of parameters, cannot realize the multithreading system operation of optimal dynamic denitration, cannot synchronously realize the function of periodical automatic or manual maintenance through deepened monitoring and intellectualized predetection and judgment whether the periodicity needs to be maintained or not.
Drawings
FIG. 1 shows a flow chart of the present invention;
FIG. 2 shows a process system diagram of the present invention;
illustration of the drawings: 1. a rotary kiln smoke tube; 2. a two-smoke-pipe of the electric furnace; 3. a hot blast stove; 4. a cyclone dust collector; 5. a denitration reactor; 6. a booster fan; 7. a drying kiln; 8. an electrostatic precipitator; 9. a main fan; 10. a desulfurizing tower.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1-2, the denitration flue gas interlock control system is in through connection with a desulfurization tower 10 based on a pipeline, and comprises a single-channel denitration unit, a denitration acquisition unit, a data storage unit, a denitration monitoring unit and a depth monitoring unit;
the single-path denitration unit is used for carrying out mixed denitration on various kinds of flue gas in parallel; the single-channel denitration unit is provided with a plurality of denitration units which form multithreading denitration operation and is communicated with the desulfurization tower 10 through a pipeline;
the single-way denitration unit is arranged in a multi-thread way and is communicated with the desulfurization tower 10 through a pipeline, the single-way denitration unit comprises a hot blast stove 3, the air inlet of the hot-blast stove 3 is communicated with one end of a rotary kiln smoke pipe 1 and an electric furnace two-branch smoke pipe 2, so that the smoke of the rotary kiln enters the air inlet of the hot-blast stove 3 through the rotary kiln smoke pipe 1 and enters the hot-blast stove 3, meanwhile, the flue gas generated by the electric furnace enters the air inlet of the hot blast stove 3 through a part of the electric furnace double smoke distributing pipe 2 and enters the hot blast stove 3, the hot blast stove 3 mixes and heats part of the electric furnace flue gas and the rotary kiln flue gas to a preset temperature, the preset temperature is usually between 300 ℃ and 420 ℃, thereby ensuring the optimal denitration capability of the mixed flue gas, a cyclone dust collector 4, a denitration reactor 5, a booster fan 6, a drying kiln 7, an electrostatic dust collector 8 and a main fan 9 are sequentially connected with the air outlet of the hot blast stove 3 in a penetrating way through a pipeline, one end of the main fan 9 far away from the electrostatic dust collector 8 is connected with the air inlet of a desulfurizing tower 10 in a penetrating way through a pipeline, the denitration reactor 5 is used for carrying out denitration treatment on mixed gas, the cyclone dust collector 4 and the electrostatic dust collector 8 are used for cleaning solid impurities in flue gas in a multi-level way, the other end of the electric furnace two smoke distributing pipe 2 is communicated with a pipeline between the denitration reactor 5 and the booster fan 6, and both ends of the electric furnace two-divided smoke pipe 2 are respectively provided with an electric throttle valve, so that the other part of the electric furnace two-divided smoke pipe 2 enters the air inlet of the hot blast stove 3 and enters the hot blast stove 3, the flow quality of the flue gas of the electric furnace double smoke distributing pipe 2 is controllable, and the main fan 9 and the booster fan 6 are used for controlling the flow rate and the air pressure of the flue gas, so that the optimal high-efficiency operation rate of denitration is ensured;
the specific process steps of denitration are as follows:
firstly, flue gas generated by a rotary kiln enters an air inlet of a hot blast stove 3 through a rotary kiln smoke pipe 1, flue gas generated by an electric stove enters the air inlet of the hot blast stove 3 through one end part of an electric stove two-way smoke pipe 2, the flue gas of the electric stove and the rotary kiln enters the hot blast stove 3 through the air inlet of the hot blast stove 3, the hot blast stove 3 mixes and heats the flue gas of the electric stove and the rotary kiln to a preset temperature to form high-temperature mixed gas, the high-temperature mixed gas enters a cyclone dust collector 4 through a pipeline to remove fixed particles and then enters a denitration reactor 5, the high-temperature mixed gas is denitrated by the denitration reactor 5 and mixed with the flue gas at the other end part of the electric stove two-way smoke pipe 2 to flow through a drying kiln 7 and an electrostatic dust collector 8 through a booster fan 6 to form denitrated clean gas, the denitrated clean gas is sucked by a main fan 9 through the pipeline and injected into a desulfurization tower 10, and the denitrated clean gas is subjected to desulfurization treatment;
in the process, the nitrate oxide in the flue gas of the rotary kiln and the nitrate oxide in the flue gas of the electric furnace are treated, the content of the nitrate oxide in the flue gas of the electric furnace is low, and because the mass flow rate of the nitrate oxide in the flue gas of the electric furnace is far lower than that of the flue gas of the rotary kiln, the content of the nitrate oxide after the treated flue gas of the rotary kiln and the flue gas of the electric furnace are mixed is in the environmental protection requirement, the consumption of related reactants and related energy sources in the process of the environmental protection requirement is reduced while the environmental protection requirement is ensured, the utilization rate of the related reactants and the related energy sources is improved, and the denitration efficiency and the denitration effect are enhanced,
step two, the denitration collecting unit collects real-time distribution condition information of the flue gas in the denitration process and real-time temperature information in the denitration process and sends the real-time distribution condition information and the real-time temperature information to the data storage unit for storage;
the real-time coordination condition information of the flue gas in the denitration process comprises the average flow velocity of the traction flue gas in the denitration process, the mixed flue gas content of the flue gas of the rotary kiln in the denitration process, the mixed flue gas content of the flue gas of the electric furnace in the denitration process and the real-time denitration amount of the mixed flue gas in the denitration process, and the real-time temperature information in the denitration process comprises the average temperature value of the mixed flue gas in the hot blast stove 3 and the average temperature value outside the hot blast stove 3;
step three, the denitration monitoring unit acquires real-time distribution condition information of the flue gas in the denitration process and real-time temperature information in the denitration process through the data storage unit;
respectively marking the average flow velocity of traction flue gas in the denitration process, the mixed flue gas content of rotary kiln flue gas in the denitration process, the mixed flue gas content of electric furnace flue gas in the denitration process and the real-time denitration amount of the mixed flue gas in the denitration process as QV, ZY, DY and HY, and respectively marking the average temperature value of the mixed flue gas in the hot blast stove 3 and the average temperature value outside the hot blast stove 3 in the real-time temperature information in the denitration process as RW and HW;
acquiring a preset flow rate threshold value QV corresponding to the average flow rate QV of the traction flue gas in the denitration process, generating a first traction flow rate signal when QV is less than Qvmin, automatically controlling the booster fan 6 and the main fan 9 to work and improving the power of the booster fan 6 and the main fan 9 after the traction flow rate signal is generated until Qvmin is less than QV and less than Qvmax, and automatically controlling the booster fan 6 and the main fan 9 to work and reducing the working power of the booster fan after the second traction flow rate signal is generated when QV is more than or equal to QV until Qvmin is less than QV and less than Qvmax; the average flow velocity QV of the traction flue gas in the denitration process is always kept within a preset flow velocity threshold value Qv, so that the denitration overtime caused by too slow speed is avoided, the efficiency is lower, and incomplete denitration caused by too fast speed is avoided, so that the denitration is in an optimal flowing state, and the efficiency is optimal;
when Qvmin is less than QV and less than Qvmax, then obtaining a constant temperature value HW of the smoke through a formula HW = e2 (RW-e 1 HW), comparing the constant temperature value HW of the smoke with a preset temperature threshold Hw, and when the HW is greater than the Hwmax value, generating a first temperature control signal, and automatically controlling the temperature until the temperature is more than Hwmin and less than or equal to Hwmax; when HW is less than or equal to the value Hwmin, a second temperature control signal is generated, and the temperature is automatically controlled until Hwmin is less than or equal to the value Hwmax;
wherein, the higher the average temperature outside the hot blast stove 3 HW is, the lower the heat dissipation capacity of the hot blast stove 3 and the flue gas is; when the average temperature outside the hot blast stove 3 HW is lower, the heat dissipation capacity of the hot blast stove 3 and the flue gas is higher, temperature change needs to be compensated, the temperature is ensured to be constant, and the nitrified substances in the flue gas are in the optimal separation state;
when Hwmin < HW < Hwmax, the formula is followed
Obtaining a real-time constant temperature and constant quantity variable A of the mixed flue gas;
then comparing the real-time constant temperature and constant quantity variable A of the mixed flue gas with a corresponding preset value a,
when a is less than A, an interlocking control signal is generated, otherwise, a control signal is not generated, and when the interlocking control signal is generated, the flue gas of the electric furnace is automatically subjected to shunt control to reduce the real-time content of the flue gas entering the hot blast stove, so that the optimal mixing temperature state is between 300 ℃ and 420 ℃, and the subsequent efficient denitration is ensured;
wherein e1, e2, e3, e4 and e5 are dynamic constant factors which make the calculated result closer to the true value, e1+ e2+ e3+ e4+ e5=18.37, and e5 > e3 > e2 > e1 > e4;
the method has the advantages that the traction flue gas speed, the temperature inside and outside the flue gas and the content parameters of the mixed gas are monitored and subjected to linkage treatment, so that the whole denitration system is ensured to be in an optimal denitration state and an automatic correction process in a non-optimal denitration state, the optimal denitration state is ensured constantly, the decarburization efficiency and denitration quality of the system are ensured, and the intelligence of the whole denitration system is enhanced;
step four, the information acquisition unit acquires signal time variable information in the operation process of the denitration monitoring unit and sends the signal time variable information to the data storage unit for storage, and whether a fault exists in the single-thread or multi-thread optimal dynamic denitration process within the periodic time is judged through processing the time variable information in the operation process of the denitration monitoring unit, so that the denitration monitoring unit can be automatically or manually repaired;
the signal time variable information in the operation process of the denitration monitoring unit consists of the total generation time of the first traction flow speed signal, the total generation time of the second traction flow speed signal, the total generation time of the first temperature control signal, the total generation time of the second temperature control signal and the total generation time of the interlocking control signal;
step five, the depth supervision unit obtains time variable information in the operation process of the denitration monitoring unit in the latest time period and multiplies an internal time length value of the time variable information by a bias constant corresponding to the value to obtain a corresponding bias weight value, then quantifies a plurality of bias weight values to obtain a standard deviation and an average value of the bias weight values, the standard deviation and the average value of the bias weight values are respectively marked as T1 and T2, then B = | T1-T2|/T2 is a periodic bias weight value of the bias weight value, whether the denitration system needs to be periodically detected or not is judged according to the size of the periodic bias weight value of the bias weight value, when B is larger than B, a periodic maintenance signal is generated, the maintenance equipment is automatically controlled to maintain the system or automatically remind workers to maintain the system, otherwise, no control signal is generated, and the denitration system does not need to be maintained in the period;
through time length detection feedback analysis of various signals, periodic maintenance of the system is pre-judged, the periodic maintenance frequency is reduced, the working intensity is reduced, and the service efficiency of the system is ensured; the bias constant is the weight value of each signal, so that the calculated result is closer to the true value;
step six, performing cooperative monitoring on the optimal multi-thread denitration operation through the processes of the step one and the step five, so as to further improve the denitration efficiency;
by integrating the denitration process, on the basis of multi-thread mixed flue gas denitration operation according to a quantitative proportion, the system acquires internal and external temperature parameters of flue gas, a pulled flue gas flow velocity parameter and a multi-flue gas mixed processing content parameter through single-thread parallel monitoring in multi-thread, then carries out chain deepening analysis processing on each parameter to generate various corresponding signals, sequentially controls system components through various signals to enable the denitration system to be in an optimal denitration state and ensure that the denitration rate is optimal, and also carries out deepening monitoring processing and prejudges whether the periodicity needs maintenance work or not through time acquisition of each signal so as to ensure long-term stable operation of the system.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (6)
1. Denitration flue gas interlock control system has desulfurizing tower (10) based on pipeline through connection, its characterized in that includes:
the single-path denitration unit is used for mixing and locking denitration on various flue gases;
the denitration collecting unit is used for collecting real-time distribution condition information of flue gas in the denitration process and real-time temperature information in the denitration process, collecting signal time variable information in the operation process of the denitration monitoring unit and sending the information to the data storage unit for storage;
the data storage unit is used for receiving and storing information;
the denitration monitoring unit acquires real-time distribution information of flue gas in the denitration process and real-time temperature information in the denitration process through the data storage unit, carries out linkage processing on the real-time distribution information and the real-time temperature information to generate a first traction flow rate signal, a second traction flow rate signal, a first temperature control signal, a second temperature control signal and an interlocking control signal, and controls the work of a single-channel denitration unit component for realizing optimal denitration operation corresponding to the signals;
the deep monitoring unit is used for acquiring signal time variable information in the operation process of the denitration monitoring unit through the data storage unit, performing deep optimization processing on the signal time variable information and generating a periodic maintenance signal, and the periodic maintenance signal is generated and used for automatically maintaining the denitration system;
the real-time coordination information of the flue gas in the denitration process comprises the average flow velocity of the traction flue gas in the denitration process, the mixed flue gas content of the rotary kiln flue gas in the denitration process, the mixed flue gas content of the electric furnace flue gas in the denitration process and the real-time denitration amount of the mixed flue gas in the denitration process, and the real-time temperature information in the denitration process comprises the average temperature value when the flue gas is mixed in the hot blast stove (3) and the average temperature value outside the hot blast stove (3).
2. The denitration flue gas interlock control system according to claim 1, wherein the one-way denitration unit is arranged in a multi-thread manner and is connected with the desulfurization tower (10) through a pipeline, the one-way denitration unit comprises a hot-blast stove (3), an air inlet of the hot-blast stove (3) is connected with one end part of the rotary kiln smoke pipe (1) and the electric furnace two-divided smoke pipe (2) through a pipeline, an air outlet of the hot-blast stove (3) is sequentially connected with a cyclone dust collector (4), a denitration reactor (5), a booster fan (6), a drying kiln (7), an electrostatic dust collector (8) and a main fan (9) through a pipeline, one end of the main fan (9) far away from the electrostatic dust collector (8) is connected with the air inlet of the desulfurization tower (10) through a pipeline, the other end part of the electric furnace two-divided smoke pipe (2) is connected with a pipeline between the denitration reactor (5) and the booster fan (6) through, and electric throttle valves are installed at two ends of the electric furnace two-divided smoke pipe (2).
3. The denitration flue gas interlock control system of claim 1, wherein the denitration monitoring unit has the following chain treatment process:
respectively marking the average flow speed of traction smoke in the denitration process, the mixed smoke content of rotary kiln smoke in the denitration process, the mixed smoke content of electric furnace smoke in the denitration process, the real-time denitration amount of the mixed smoke in the denitration process, the average temperature value when the smoke is mixed in the hot blast stove (3) and the average temperature value outside the hot blast stove (3) as QV, ZY, DY, HY, RW and HW;
acquiring a preset flow rate threshold value QV corresponding to the average flow rate QV of traction flue gas in the denitration process, generating a first traction flow rate signal when QV is less than Qvmin, automatically controlling a booster fan (6) and a main fan (9) to work and improving the power of the booster fan after generating the traction flow rate signal until Qvmin is less than QV and Qvmax, and automatically controlling the booster fan (6) and the main fan (9) to work and reducing the working power of the booster fan after generating a second traction flow rate signal until Qvmin is less than QV and Qvmax; the average flow velocity QV of the traction flue gas in the denitration process is always kept within a preset flow velocity threshold value Qv, so that the denitration overtime caused by too slow speed is avoided, the efficiency is lower, and incomplete denitration caused by too fast speed is avoided, so that the denitration is in an optimal flowing state, and the efficiency is optimal;
when Qvmin is less than QV and less than Qvmax, then obtaining a constant temperature value HW of the smoke through a formula HW = e2 (RW-e 1 HW), comparing the constant temperature value HW of the smoke with a preset temperature threshold Hw, and when the HW is greater than the Hwmax value, generating a first temperature control signal, and automatically controlling the temperature until the temperature is more than Hwmin and less than or equal to Hwmax; when HW is less than or equal to the value Hwmin, a second temperature control signal is generated, and the temperature is automatically controlled until Hwmin is less than or equal to the value Hwmax;
wherein the higher the average temperature value HW outside the hot blast stove (3), the lower the heat dissipation capacity of the hot blast stove (3) and the flue gas; when the average temperature HW outside the hot blast stove (3) is lower, the heat dissipation capacity of the hot blast stove (3) and the flue gas is higher, temperature change needs to be compensated, the temperature is ensured to be constant, and the nitrified substances in the flue gas are in the optimal separation state;
when Hwmin is more than HW and less than or equal to Hwmax, according to the formula
Obtaining a real-time constant temperature and constant quantity variable A of the mixed flue gas;
and then comparing the real-time constant temperature constant variable A of the mixed flue gas with a corresponding preset value a, generating an interlocking control signal when a is less than A, otherwise, not generating a control signal, and automatically performing shunt control on the flue gas of the electric furnace after generating the interlocking control signal to reduce the real-time content of the flue gas entering the hot blast stove.
4. The denitration flue gas interlock control system of claim 3, wherein the signal time variable information during the operation of the denitration monitoring unit is composed of the total generation duration of the first traction flow rate signal, the total generation duration of the second traction flow rate signal, the total generation duration of the first temperature control signal, the total generation duration of the second temperature control signal and the total generation duration of the interlock control signal.
5. The denitration flue gas interlock control system of claim 4, wherein the deep optimization process of the deep monitoring unit comprises the following steps:
multiplying the total generation duration of the first traction flow speed signal, the total generation duration of the second traction flow speed signal, the total generation duration of the first temperature control signal, the total generation duration of the second temperature control signal and the total generation duration of the interlocking control signal by corresponding weight constants to obtain corresponding weight values, quantizing a plurality of weight values to obtain standard deviation and average value of the weight values, respectively marking the standard deviation and the average value of the weight values as T1 and T2, then judging whether the denitration system needs periodic detection or not according to the size of the periodic weight value of the weight values, and when B is greater than B, generating a periodic maintenance signal needing maintenance in the period; otherwise, the control signal which does not need maintenance in the period is not generated.
6. The denitration process of the denitration flue gas interlock control system according to claim 5, characterized by comprising the following specific process steps:
the method comprises the following steps: quantitatively mixing and inputting rotary kiln flue gas or electric furnace flue gas into a hot blast stove, mixing and heating the electric furnace flue gas and the rotary kiln flue gas by the hot blast stove to form high-temperature mixed gas, enabling the high-temperature mixed gas to enter a cyclone dust collector through a pipeline to remove fixed particles and then enter a denitration reactor, enabling the high-temperature mixed gas to be denitrated by the denitration reactor and then mixed with the flue gas at the other end of a two-way smoke pipe of the electric furnace, enabling the denitrated high-temperature mixed gas to flow through a drying kiln and an electrostatic dust collector through traction of a booster fan and suction of a main fan to form constant-speed denitration clean gas, injecting the constant-speed denitration clean gas into a desulfurization tower through a pipeline, and performing desulfurization treatment on the constant-speed denitration clean gas;
step two: the denitration collecting unit collects real-time distribution condition information of flue gas in the denitration process and real-time temperature information in the denitration process and sends the real-time distribution condition information and the real-time temperature information to the data storage unit for storage; then, the denitration monitoring unit carries out linkage processing on the real-time matching condition information of the flue gas in the denitration process and the real-time temperature information in the denitration process and generates various linkage signals, so that the denitration system is controlled to be gradually in and keep the optimal operation state in a grading manner;
step three: after the denitration system keeps the optimal operation state, the information acquisition unit acquires the time variable information of the signal in the operation process of the denitration monitoring unit again and sends the time variable information to the data storage unit for storage, and at the moment, the deep supervision unit acquires the time variable information in the operation process of the denitration monitoring unit in the latest time period and carries out deep optimization processing on the time variable information and generates a periodic maintenance signal for pre-judging the need of carrying out periodic maintenance on the denitration system automatically, so that the operation efficiency of the denitration system is ensured and the frequency of the periodic maintenance is reduced;
step four: and applying the processes from the first step to the third step to the multithread cooperative deep monitoring denitration operation.
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