CN111765776B - System and method for controlling comprehensive parameters in flue gas hood of sintering machine - Google Patents
System and method for controlling comprehensive parameters in flue gas hood of sintering machine Download PDFInfo
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- CN111765776B CN111765776B CN202010644844.5A CN202010644844A CN111765776B CN 111765776 B CN111765776 B CN 111765776B CN 202010644844 A CN202010644844 A CN 202010644844A CN 111765776 B CN111765776 B CN 111765776B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2003/00—Type of treatment of the charge
- F27M2003/04—Sintering
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The invention relates to a comprehensive parameter control system in a sintering machine flue gas hood, which comprises a flue gas hood, an adjusting valve, a main pipeline, a circulating fan air door and a control system, wherein the flue gas hood is provided with a gas inlet and a gas outlet; the control system is characterized by comprising an oxygen meter, a thermometer, a pressure gauge I, a pressure gauge II, a logic controller and computer software, wherein the oxygen meter, the thermometer and the pressure gauge I are arranged below the regulating valve, and the pressure gauge II is arranged in the main pipeline; the logic controller is electrically connected with the oxygen meter, the thermometer, the pressure gauge I, the pressure gauge II, the regulating valve and the circulating fan air door, and the computer software is electrically connected with the logic controller; the computer software comprises a comprehensive parameter analysis unit, an air inlet main pipeline pressure adjusting unit, an oxygen content adjusting unit, a pressure adjusting unit and a temperature adjusting unit. Its advantage is: the coordination control of comprehensive parameters is realized by the regulation control of the air door and the regulating valve of the circulating fan and the combination of PLC multipoint detection and a comprehensive analysis algorithm, the quality of the sintered ore is improved, and the effects of energy conservation, emission reduction and consumption reduction are achieved.
Description
Technical Field
The invention relates to the technical field of industrial computer real-time control, in particular to a system and a method for controlling comprehensive parameters in a flue gas hood of a sintering machine.
Background
The traditional sintering production has the characteristics of large waste gas amount, serious pollution load, various pollutants and the like, and the sintering flue gas circulation technology can well solve the problem. The flue gas circulation is a process of circularly recovering and recycling the flue gas discharged in the sintering process, and the amount of the circulating flue gas accounts for 20-30% of the total discharge amount. The technology not only reduces the total smoke discharge amount of sintering production and reduces heat loss, but also causes the nitrogen oxide and the sulfur oxide to generate secondary chemical reaction in the smoke circulation process, converts part of harmful substances into harmless substances and reduces the discharge of the harmful substances. The flue gas hood of the sintering machine is arranged above the sintering machine trolley to form a closed space for flue gas to flow circularly, and is an important component of flue gas circulation. Under the action of the circulating fan, sintering flue gas enters the flue gas hood from the air inlet main pipeline, then passes through sintering raw materials in the trolley to enter the air outlet pipeline, and finally flows back to the air inlet main pipeline from part of the air outlet pipeline, so that a flue gas circulating process is completed. The coordinated control of the parameters such as temperature, pressure and oxygen content in the flue gas hood is very important for sintering production, and the unstable parameter control not only influences the quality of sintered finished ore, but also wastes heat energy resources and increases the production cost. Therefore, the stability of parameters such as temperature, pressure and oxygen content in the flue gas hood is a difficult problem to be solved urgently in sintering production.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a system and a method for controlling comprehensive parameters in a flue gas hood of a sintering machine.
The purpose of the invention is realized by the following technical scheme:
the invention discloses a comprehensive parameter control system in a flue gas hood of a sintering machine, which comprises a trolley, a flue gas hood arranged above the trolley, an air outlet pipeline arranged below the trolley and corresponding to the flue gas hood, an air inlet branch pipeline arranged above the flue gas hood, an air inlet main pipeline connected with the air inlet branch pipeline, a circulating fan air door, a circulating fan, a logic controller and a computer software system, and is characterized in that a plurality of groups of air inlet adjusting pipes are arranged at the top of the flue gas hood at equal intervals, an air inlet adjusting valve is arranged at the upper end of each air inlet adjusting pipe, the air inlet branch pipeline is arranged between every two groups of air inlet adjusting pipes, an oxygen meter, a thermometer and a pressure gauge I are arranged below each group of air inlet adjusting pipes in the flue gas hood, and a pressure gauge II is arranged in the air inlet main pipeline; the oxygen measuring meter, the thermometer, the pressure meter I, the pressure meter II, the air inlet regulating valve, the circulating fan air door and the circulating fan are electrically connected with the logic controller, and the computer software system is electrically connected with the logic controller;
the computer software system comprises an integrated parameter analysis unit, an air inlet main pipeline pressure adjusting unit, an oxygen content adjusting unit, a pressure adjusting unit and a temperature adjusting unit, wherein the input end of the integrated parameter analysis unit is connected with the output end of the logic controller, the output end of the integrated parameter analysis unit is connected with the input end of the air inlet main pipeline pressure adjusting unit, the oxygen content adjusting unit, the pressure adjusting unit and the temperature adjusting unit, and the output end of the air inlet main pipeline pressure adjusting unit, the oxygen content adjusting unit, the pressure adjusting unit and the temperature adjusting unit are connected with the input end of the logic controller.
As a further optimization of the invention, the comprehensive parameter analysis unit is used for determining the control flow of each parameter, and the pressure regulation unit of the main air inlet pipeline is used for calculating and determining the opening H of the circulating fan c The oxygen content adjusting unit is used for determining the opening degree H of the valve a and the valve b of the two air inlet adjusting valves in the combination a And H b The pressure regulating unit is used for calculating and determining the opening degree H of the a valve and the b valve of the two air inlet regulating valves in the combination a And H b The temperature adjusting unit is used for calculating and determining the opening degree H of the valve a and the valve b of the two air inlet adjusting valves in the combination a And H b 。
As a further optimization of the invention, the number of each group of air inlet adjusting pipes is two, and 4-6 groups are arranged.
As a further optimization of the invention, the air inlet branch pipelines are provided with 3-5 air inlet branch pipelines which are sequentially arranged on the side wall of the smoke cover between each group of air inlet adjusting pipes.
The invention discloses a method for controlling comprehensive parameters in a flue gas hood of a sintering machine, which is characterized in that the method for controlling the comprehensive parameters in the flue gas hood of the sintering machine comprises the following steps:
step 1, control flow for determining each parameter by comprehensive parameter analysis unit
Step 1.1, determining the control flow of the pressure of the main air inlet pipeline
Let the pressure range allowable in the main intake air pipeline be (P' min ,P’ max ) The measured value of a pressure gauge II in the main air inlet pipeline is P' m Then, the air inlet main pipeline pressure control flow divide into following two kinds of condition:
a) When P' m ∈(P’ min ,P’ max ) Then, entering step 1.2;
b) When the temperature is higher than the set temperature
Then, entering step 2;
step 1.2, control flow for determining oxygen content in flue gas hood
The oxygen content control range is (A) min ,A max ) The measured value of the oxygen meter is A m The flow of controlling the oxygen content in the flue gas cover is divided into the following two conditions:
a) When A is m ∈(A min ,A max ) Then, entering step 1.3;
b) When the temperature is higher than the set temperature
If yes, entering step 3;
step 1.3, control flow for determining pressure in flue gas hood 2
Let the pressure control range be (P) min ,P max ) The pressure gauge measuring value is P m Then, the flow of the pressure control in the flue gas hood is divided into the following two cases:
a) When P is present m ∈(P min ,P max ) Then, entering step 1.4;
b) When in use
If so, entering the step 4;
step 1.4, control flow for determining temperature in smoke hood
The temperature control range in the smoke cover is set as (T) min ,T max ) Measured value of thermometer is T m Then, the temperature control flow in the flue gas hood is divided into the following two situations:
a) When T is m ∈(T min ,T max ) Then, entering step 1.1;
b) When in use
If yes, entering step 5;
Step 2.1, determining a pressure target value P 'of a main air inlet pipeline' o
Let the pressure range interval allowed in the main air inlet pipeline be (P' min ,P’ max ) Main intake air line pressure target value P' o Determined by equation (1):
step 2.2, determining the pressure difference P 'of the main air inlet pipeline' △
If measured value of pressure gauge II in main air inlet pipeline is P' m Air intake main pipeline pressure difference P' △ Determined by equation (2):
P’ △ ＝P’ o -P’ m (2)
step 2.3, determining PID control dead zone M' c
PID is adopted to control the opening of the circulating fan wind door, and PID controls a dead zone M' c Determined by equation (3):
step 2.4, determining the opening H of the circulating fan by adopting PID control c
PID control is adopted, and the opening H of the circulating fan throttle valve c Determined by equation (4):
wherein K' p Is proportional gain, T' t Is an integration time constant, T' D Is the differential time constant;
step 3, the oxygen content adjusting unit calculates and determines the opening degree H of the valve a and the valve b of the two air inlet adjusting valves in the combination a And H b
Step 3.1, determining a target value A of oxygen content in the flue gas cover o
Target value A of oxygen content in flue gas hood o Determined by equation (5):
step 3.2, determining the oxygen content difference A in the flue gas cover △
Oxygen content difference A in fume hood △ Determined by equation (6):
A △ ＝A o -A m (6)
step 3.3, determining the oxygen content PID control dead zone M c1
PID is adopted to control the opening of the air inlet regulating valve, and PID controls a dead zone M c1 Determined by equation (7):
step 3.4, determining the opening degrees H of the valve a and the valve b of the two air inlet regulating valves in the combination by adopting PID control a And H b
The opening degrees of a valve and a valve of two air inlet regulating valves in the combination are respectively H by adopting PID control a And H b Then H is a 、H b Determined by equation (8):
wherein K p1 To proportional gain, T t1 As integration time constant, T D1 Is the differential time constant;
step 4, the pressure regulating unit calculates and determines the opening degree H of the valve a and the valve b of the two air inlet regulating valves in the combination a And H b
Step 4.1, determining the target value P of the pressure in the smoke cover o
Target value P of pressure in smoke hood o Determined by equation (9):
step 4.2, determining the pressure difference P in the smoke cover △
Pressure difference P in fume hood △ Determined by equation (10):
P △ ＝P o -P m (10)
step 4.3, determining pressure PID control dead zone M in the smoke cover c2
PID is adopted to control the opening of the air inlet regulating valve, and PID controls a dead zone M c2 Determined by equation (11):
and 4.4, determining the opening degrees H of the valve a and the valve b of the two air inlet regulating valves in the combination by adopting PID control a And H b
The opening degrees of a valve a and a valve b of the two air inlet regulating valves in the combination are respectively H by adopting PID control a And H b Then H is a 、H b Determined by equation (12):
wherein K p2 To proportional gain, T t2 As integration time constant, T D2 Is the differential time constant;
Step 5.1, determining the temperature target value T o
Target temperature T in smoke hood o Determined by equation (13):
step 5.2, determining the temperature difference T △
Temperature difference T in smoke hood △ Determined by equation (14):
T △ ＝T o -T m (14)
step 5.3, determining the temperature PID control dead zone M c3
PID is adopted to control the opening of the air inlet regulating valve and the dead zone M c3 Determined by equation (15):
and 5.4, determining the opening degrees H of the valve a and the valve b of the two air inlet regulating valves in the combination by adopting PID control a And H b
The opening degrees of a valve a and a valve b of the two air inlet regulating valves in the combination are respectively H by adopting PID control a And H b Then H is a 、H b Determined by equation (16):
wherein K p3 To proportional gain, T t3 To integrate the time constant, T D3 Is the derivative time constant.
Compared with the prior art, the invention has the advantages that:
the system realizes the coordination control of comprehensive parameters in the flue gas hood of the sintering machine by the adjustment control of the air door and the flue gas hood regulating valve of the circulating fan and combining a multi-point detection and comprehensive analysis algorithm based on PLC, and the control mode not only can improve the quality of sintered finished ore, but also saves production resources and reduces production cost.
Drawings
FIG. 1 is a schematic diagram of a control system according to the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a block diagram of a computer software system architecture according to the present invention;
FIG. 4 is a flow chart of the logic algorithm calculation of the present invention.
Detailed Description
In order that the invention may be clearly, fully and completely described, it will be further described in the following detailed description of the preferred embodiments with reference to the accompanying drawings.
As shown in fig. 1 and 2, the comprehensive parameter control system in the flue gas hood of the sintering machine of the invention comprises a trolley 1, a flue gas hood 2 arranged above the trolley 1, an air outlet pipeline 13 arranged below the trolley 1 and corresponding to the flue gas hood, an air inlet branch pipeline 12 arranged above the flue gas hood 2, an air inlet main pipeline 8 connected with the air inlet branch pipeline 12, a circulating fan air door 10, a circulating fan 9, a logic controller and a computer software system, and is characterized in that a plurality of groups of air inlet adjusting pipes 3 are arranged at equal intervals at the top of the flue gas hood 2, an air inlet adjusting valve 4 is arranged at the upper end of the air inlet adjusting pipe 3, the air inlet branch pipeline 12 is arranged between every two groups of air inlet adjusting pipes 3, an oxygen meter 5, a thermometer 7 and a pressure gauge I6 are arranged below each group of air inlet adjusting pipes 3 in the flue gas hood 2, and a pressure gauge II 11 is arranged in the air inlet main pipeline; the oxygen meter 5, the thermometer 7, the pressure gauge I6, the pressure gauge II 11, the air inlet regulating valve 4, the circulating fan air door 10 and the circulating fan 9 are all electrically connected with the logic controller, and the computer software system is electrically connected with the logic controller; each group of air inlet adjusting pipes 3 are two and are provided with 4-6 groups, in this example, 6 groups, correspondingly, the air inlet branch pipes are provided with 5 groups which are sequentially arranged on the side wall of the smoke cover between the air inlet adjusting pipes of each group.
As shown in fig. 3, computer software system include comprehensive parameter analysis unit, 8 pressure regulating unit of air inlet trunk line, oxygen content regulating unit, pressure regulating unit and temperature regulation unit, comprehensive parameter analysis unit input with logic controller output connect, comprehensive parameter analysis unit output is connected with air inlet trunk line pressure regulating unit, oxygen content regulating unit, pressure regulating unit and temperature regulation unit input, air inlet trunk line pressure regulating unit, oxygen content regulating unit, pressure regulating unit and temperature regulation unit output are connected with logic controller input.
The comprehensive parameter analysis unitThe control flow for determining all parameters, the pressure regulating unit of the main air inlet pipeline is used for calculating and determining the opening degree H of the circulating fan c The oxygen content adjusting unit is used for determining the opening degree H of the valve a and the valve b of the two air inlet adjusting valves in the combination a And H b The pressure regulating unit is used for calculating and determining the opening degree H of the valve a and the valve b of the two air inlet regulating valves in the combination a And H b The temperature adjusting unit is used for calculating and determining the opening degree H of the valve a and the valve b of the two air inlet adjusting valves in the combination a And H b 。
The reaction modes of the sintering raw materials at different stages in the sintering process are different, and the requirements on parameters such as oxygen content, pressure, temperature and the like in the flue gas hood 2 are also different. Aiming at the sintering characteristics, the principle of sectional control is adopted for the internal space of the flue gas hood 2, the oxygen meter 5, the pressure gauge I6 and the thermometer 7 in each section are used for measuring the oxygen content value, the pressure value and the temperature value in the space of the section, and the two air inlet adjusting valves 4 at the top of each section of flue gas hood 2 are used for adjusting the air volume of external air entering the flue gas hood 2 so as to control the comprehensive parameters in the section of flue gas hood 2.
As shown in fig. 4, the method for controlling the comprehensive parameters in the flue gas hood of the sintering machine according to the present invention is characterized in that the system for controlling the comprehensive parameters in the flue gas hood of the sintering machine comprises the following steps:
step 1, a control flow for determining each parameter by a comprehensive parameter analysis unit
According to the importance degree of the process parameters on sintering production, the control system sequentially starts the control flow of each parameter according to the sequence of the pressure of the main air inlet pipeline 8, the oxygen content in the flue gas hood 2, the pressure in the flue gas hood 2 and the temperature in the flue gas hood 2.
Step 1.1, determining 8 pressure control flow of main air inlet pipeline
The precondition of intelligent regulation of the flue gas hood 2 is a circulating flue gas environment with normal ventilation, the measurement standard is the pressure of the main air inlet pipeline 8, and when the pressure is in a certain specific interval, the circulating air ventilation is normal.
The allowable pressure range interval in the main intake air duct 8 is (P' min ,P’ max ) The measured value of a pressure gauge II 11 in the main air inlet pipeline 8 is P' m Then, the control flow of the pressure of the main air inlet pipe 8 is divided into the following two conditions:
a) When P' m ∈(P’ min ,P’ max ) When the pressure of the main air inlet pipeline 8 is normal, the oxygen content control link of the flue gas hood 2 can be entered, and the control system enters the step 1.2;
b) When the temperature is higher than the set temperature
When the pressure of the main air inlet pipeline 8 is abnormal, the pressure regulation link of the main air inlet pipeline 8 is needed, and the control system enters the step 2;
step 1.2, determining smoke, 2, controlling flow of oxygen content
On the premise that the pressure of the air inlet main pipeline 8 is normal, the control flow of the oxygen content in the flue gas hood 2 is carried out, and the control flow specifically comprises the following steps:
setting the control range interval of the oxygen content in the flue gas hood as (A) min ,A max ) The measured value of the oxygen meter 5 in the smoke cover 2 is A m The flow of controlling the oxygen content in the flue gas cover 2 is divided into the following two cases:
a) When A is m ∈(A min ,A max ) When the oxygen content in the flue gas cover is normal, the process can enter a pressure control link in the flue gas cover 2, and the system enters a step 1.3;
b) When in use
When the oxygen content in the flue gas cover is abnormal, the control link of the oxygen content in the flue gas cover needs to be entered, and the system enters the step 3;
step 1.3, control flow for determining pressure in flue gas hood 2
Under the prerequisite that satisfies 8 pressures of air inlet trunk line normal, carry out the control flow of 2 internal pressures of flue gas cover, specifically as follows:
the range of pressure control in the flue gas hood 2 is set as (P) min ,P max ) The measured value of the pressure gauge 6 in the fume hood 2 is P m Then smoke cover 2The control flow of the internal pressure is divided into the following two conditions:
a) When P is m ∈(P min ,P max ) When the pressure in the flue gas hood 2 is normal, the control link of the temperature in the flue gas hood 2 can be entered, and the control system enters the step 1.4;
b) When in use
When the pressure in the flue gas cover 2 is abnormal, the control link of the pressure in the flue gas cover needs to be entered, and the control system enters the step 4;
step 1.4, determining the control flow of the temperature in the flue gas hood
Under the prerequisite that 8 pressures of satisfying the air inlet trunk line are normal, carry out the control flow of temperature in the flue gas cover 2, specifically as follows:
the temperature control range interval in the flue gas cover 2 is set as (T) min ,T max ) The measured value of the temperature table 6 in the flue gas cover 2 is T m Then, the temperature control flow in the flue gas hood 2 is divided into the following two cases:
a) When T is m ∈(T min ,T max ) When the temperature in the flue gas hood 2 is normal, no adjustment is needed, and the system enters the step 1.1;
b) When in use
When the temperature in the flue gas hood 2 is abnormal, the temperature control link in the flue gas hood needs to be entered, and the system enters the step 5;
Step 2.1, determining a pressure target value P 'of the main air inlet pipeline 8' o
Let the pressure range interval allowed in the main intake air pipe 8 be (P' min ,P’ max ) Main intake air duct 8 pressure target value P' o Determined by equation (1):
step 2.2, determining pressure difference P 'of main air inlet pipeline 8' △
Let the measured value of a pressure gauge II 11 in the main intake air pipeline 8 be P' m And 8 pressure difference value P 'of main air inlet pipeline' △ Determined by equation (2):
P’ △ ＝P’ o -P’ m (2)
step 2.3, determining PID control dead zone M' c
PID is adopted to control the opening degree of a circulating fan air door 10, and PID is adopted to control a dead zone M' c Determined by equation (3):
step 2.4, determining the opening degree H of the air door 10 of the circulating fan by adopting PID control c
Adopting PID control, the opening degree H of the air door 10 of the circulating fan c Determined by equation (4):
wherein K' p Is proportional gain, T' t Is an integration time constant, T' D Is a differential time constant;
step 3, the oxygen content adjusting unit calculates and determines the opening degree H of the valve a and the valve b of the two air inlet adjusting valves in the combination a And H b
Step 3.1, determining a target value A of oxygen content in the flue gas hood 2 o
Target oxygen content A in fume hood 2 o Determined by equation (5):
step 3.2, determining the oxygen content difference A in the flue gas hood 2 △
Oxygen content difference A in flue gas hood 2 △ Determined by equation (6):
A △ ＝A o -A m (6)
step 3.3, determining the oxygen content PID control dead zone M in the flue gas cover 2 c1
PID is adopted to control the opening of the air inlet regulating valve and the dead zone M c1 Determined by equation (7):
step 3.4, determining the opening degrees H of the valve a and the valve b of the two air inlet regulating valves in the combination by adopting PID control a And H b
The opening degrees of a valve and a valve of two air inlet regulating valves in the combination are respectively H by adopting PID control a And H b Then H is a 、H b Determined by equation (8):
wherein K is p1 To proportional gain, T t1 To integrate the time constant, T D1 Is a differential time constant;
step 4, the pressure regulating unit calculates and determines the opening degree H of the valve a and the valve b of the two air inlet regulating valves in the combination a And H b
Step 4.1, determining the target value P of the pressure in the smoke cover 2 o
Target value P of pressure in smoke hood 2 o Determined by equation (9):
step 4.2, determining the pressure difference P in the flue gas hood 2 △
Pressure difference P in fume hood 2 △ Determined by equation (10):
P △ ＝P o -P m (10)
step 4.3, determining pressure PID control dead zone M in the flue gas cover 2 c2
PID is adopted to control the opening of the air inlet regulating valve and the dead zone M c2 Determined by equation (11):
step 4.4, determining the opening degrees H of the valve a and the valve b of the two air inlet regulating valves in the combination by adopting PID control a And H b
The opening degrees of a valve a and a valve b of the two air inlet regulating valves in the combination are respectively H by adopting PID control a And H b Then H is a 、H b Determined by equation (12):
wherein K p2 To proportional gain, T t2 As integration time constant, T D2 Is a differential time constant;
Step 5.1, determining the temperature target value T o
Target value T of temperature in smoke cover o Determined by equation (13):
step 5.2, determining the temperature difference T △
Temperature difference T in smoke hood △ Determined by equation (14):
T △ ＝T o -T m (14)
step 5.3, determining a temperature PID control dead zone M c3
PID is adopted to control the opening of the air inlet regulating valve, and PID controls a dead zone M c3 Determined by equation (15):
and 5.4, determining the opening degrees H of the valve a and the valve b of the two air inlet regulating valves in the combination by adopting PID control a And H b
The opening degrees of a valve a and a valve b of the two air inlet regulating valves in the combination are respectively H by adopting PID control a And H b Then H is a 、H b Determined by equation (16):
wherein K is p3 To proportional gain, T t3 To integrate the time constant, T D3 Is the differential time constant.
The detailed description of the invention can be varied and modified within the scope defined by the claims, and all other embodiments based on the implementation of the invention shall fall within the scope of protection of the invention, without any inventive work.
Claims (4)
1. A method for controlling comprehensive parameters in a flue gas hood of a sintering machine is characterized in that a comprehensive parameter control system in the flue gas hood of the sintering machine adopted by the method comprises a trolley, a flue gas hood arranged above the trolley, an air outlet pipeline arranged below the trolley and corresponding to the flue gas hood, an air inlet branch pipeline arranged above the flue gas hood, an air inlet main pipeline connected with the air inlet branch pipeline, a circulating fan air door, a circulating fan, a logic controller and a computer software system, wherein multiple groups of air inlet adjusting pipes are arranged at the top of the flue gas hood at equal intervals, an air inlet adjusting valve is arranged at the upper end of each air inlet adjusting pipe, the air inlet branch pipeline is arranged between every two groups of air inlet adjusting pipes, an oxygen meter, a temperature meter and a pressure meter I are arranged below each group of air inlet adjusting pipes in the flue gas hood, and a pressure meter II is arranged in the air inlet main pipeline; the oxygen measuring meter, the thermometer, the pressure meter I, the pressure meter II, the air inlet regulating valve, the circulating fan air door and the circulating fan are electrically connected with the logic controller, and the computer software system is electrically connected with the logic controller;
the computer software system comprises an integrated parameter analysis unit, an air inlet main pipeline pressure adjusting unit, an oxygen content adjusting unit, a pressure adjusting unit and a temperature adjusting unit, wherein the input end of the integrated parameter analysis unit is connected with the output end of the logic controller, the output end of the integrated parameter analysis unit is connected with the input ends of the air inlet main pipeline pressure adjusting unit, the oxygen content adjusting unit, the pressure adjusting unit and the temperature adjusting unit, and the output ends of the air inlet main pipeline pressure adjusting unit, the oxygen content adjusting unit, the pressure adjusting unit and the temperature adjusting unit are connected with the input end of the logic controller;
the method is characterized by comprising the following steps:
step 1, a control flow for determining each parameter by a comprehensive parameter analysis unit
Step 1.1, determining the control flow of the pressure of the main air inlet pipeline
Let the pressure range allowable in the main intake air pipeline be (P' min ,P′ max ) The measured value of a pressure gauge II in the main air inlet pipeline is P' m Then, the air inlet main pipeline pressure control flow divide into following two kinds of condition:
a) When P' m ∈(P′ min ,P′ max ) Then, entering step 1.2;
b) When in use
Then, entering step 2;
step 1.2, control flow for determining oxygen content
The oxygen content control range is (A) min ,A max ) The measured value of the oxygen meter is A m The flow of controlling the oxygen content in the flue gas cover is divided into the following two conditions:
a) When A is m ∈(A min ,A max ) Then, entering step 1.3;
b) When in use
If yes, entering step 3;
step 1.3, control flow for determining pressure in flue gas hood
Let the pressure control range be (P) min ,P max ) The pressure gauge measuring value is P m Then, the flow of the pressure control in the flue gas hood is divided into the following two cases:
a) When P is m ∈(P min ,P max ) Then, entering step 1.4;
b) When in use
If so, entering the step 4;
step 1.4, determining the control flow of the temperature in the flue gas hood
The temperature control range in the smoke cover is set as (T) min ,T max ) Measured value of thermometer is T m Then, the flow of temperature control in the flue gas hood is divided into the following two cases:
a) When T is m ∈(T min ,T max ) Then, entering step 1.1;
b) When in use
If yes, entering step 5;
step 2, calculating and determining the opening degree H of the circulating fan by the pressure regulating unit of the main air inlet pipeline c
Step 2.1, determining the pressure target value P' o of the main air inlet pipeline
Let the pressure range interval allowed in the main air inlet pipeline be (P' min ,P′ max ) Main intake air line pressure target value P' o Determined by equation (1):
step 2.2, determining the pressure difference P 'of the main air inlet pipeline' Δ
If measured value of pressure gauge II in main air inlet pipeline is P' m Air intake main pipeline pressure difference P' Δ Determined by equation (2):
P′ Δ ＝P′ o -P′ m (2)
step 2.3, determining PID control dead zone M' c
PID is adopted to control the opening of the circulating fan wind door, and PID controls a dead zone M' c Determined by equation (3):
step 2.4, determining the opening H of the circulating fan by adopting PID control c
Adopting PID control, circulating fan throttle opening H c Determined by equation (4):
wherein K' p To proportional gain, T t 'is the integration time constant, T' D Is the differential time constant;
step 3, the oxygen content adjusting unit calculates and determines the opening degree H of the valve a and the valve b of the two air inlet adjusting valves in the combination a And H b
Step 3.1, determining a target value A of oxygen content in the flue gas cover o
Target value A of oxygen content in flue gas hood o Determined by equation (5):
step 3.2, determining the oxygen content difference A in the flue gas cover Δ
Oxygen content difference A in flue gas hood Δ Determined by equation (6):
A Δ ＝A o -A m (6)
step 3.3, determining the oxygen content PID control dead zone M in the flue gas cover c1
PID is adopted to control the opening of the air inlet regulating valve, and PID controls a dead zone M c1 Determined by equation (7):
step 3.4, determining the opening degrees H of the valve a and the valve b of the two air inlet regulating valves in the combination by adopting PID control a And H b
The opening degrees of a valve a and a valve b of the two air inlet regulating valves in the combination are respectively H by adopting PID control a And H b Then H is a 、H b Determined by equation (8):
wherein K p1 To proportional gain, T t1 To integrate the time constant, T D1 Is a differential time constant;
step 4, the pressure regulating unit calculates and determines the opening degree H of the valve a and the valve b of the two air inlet regulating valves in the combination a And H b
Step 4.1, determining the target value P of the pressure in the smoke cover o
Target value P of pressure in smoke hood o Determined by equation (9):
step 4.2, determining pressure difference P in the smoke cover Δ
Pressure difference P in fume hood Δ Determined by equation (10):
P Δ ＝P o -P m (10)
step 4.3, determining pressure PID control dead zone M in the smoke cover c2
By PID controls the opening of the air inlet regulating valve and PID controls the dead zone M c2 Determined by equation (11):
step 4.4, determining the opening degrees H of the valve a and the valve b of the two air inlet regulating valves in the combination by adopting PID control a And H b
The opening degrees of a valve a and a valve b of the two air inlet regulating valves in the combination are respectively H by adopting PID control a And H b Then H is a 、H b Determined by equation (12):
wherein K p2 To proportional gain, T t2 As integration time constant, T D2 Is a differential time constant;
step 5, the temperature adjusting unit calculates and determines the opening degree H of the valve a and the valve b of the two air inlet adjusting valves in the combination a And H b
Step 5.1, determining the temperature target value T o
Target temperature T in smoke hood o Determined by equation (13):
step 5.2, determining the temperature difference T Δ
Temperature difference T in smoke hood Δ Determined by equation (14):
T Δ ＝T o -T m (14)
step 5.3, determining a temperature PID control dead zone M c3
PID is adopted to control the opening of the air inlet regulating valve and the dead zone M c3 Determined by equation (15):
and 5.4, determining the opening degrees H of the valve a and the valve b of the two air inlet regulating valves in the combination by adopting PID control a And H b
The opening degrees of a valve a and a valve b of the two air inlet regulating valves in the combination are respectively H by adopting PID control a And H b Then H is a 、H b Determined by equation (16):
wherein K p3 To proportional gain, T t3 To integrate the time constant, T D3 Is the derivative time constant.
2. The method for controlling the comprehensive parameters in the flue gas hood of the sintering machine according to claim 1, wherein the comprehensive parameter analysis unit is used for determining the control flow of each parameter, and the pressure regulation unit of the main air inlet pipeline is used for calculating and determining the opening H of the circulating fan c The oxygen content adjusting unit is used for determining the opening degree H of the valve a and the valve b of the two air inlet adjusting valves in the combination a And H b The pressure regulating unit is used for calculating and determining the opening degree H of the valve a and the valve b of the two air inlet regulating valves in the combination a And H b The temperature adjusting unit is used for calculating and determining the opening degree H of the valve a and the valve b of the two air inlet adjusting valves in the combination a And H b 。
3. The method for controlling the comprehensive parameters in the flue gas hood of the sintering machine according to claim 1, wherein two gas inlet adjusting pipes are arranged in each group, and 4-6 groups are arranged in total.
4. The method for controlling the comprehensive parameters in the flue gas hood of the sintering machine according to claim 1, wherein 3 to 5 air inlet branch pipelines are arranged on the side wall of the flue gas hood among the groups of air inlet adjusting pipes in sequence.
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| CN103375997A (en) * | 2012-04-28 | 2013-10-30 | 宝山钢铁股份有限公司 | Method for regulating and controlling circulating flue-gas temperature and oxygen content |
| CN203810948U (en) * | 2014-04-09 | 2014-09-03 | 中冶北方（大连）工程技术有限公司 | Emission reduction system for processing sintering exhaust gas |
| CN107419094A (en) * | 2017-08-31 | 2017-12-01 | 中冶华天工程技术有限公司 | A kind of separate system for sintering flue gas recirculation loop |
| CN110514011A (en) * | 2019-09-25 | 2019-11-29 | 北京中航泰达环保科技股份有限公司 | A kind of smoke impervious cover and the sintering flue gas circulatory system and control method |
| CN111351368A (en) * | 2020-03-11 | 2020-06-30 | 新兴铸管股份有限公司 | Method for improving circulating smoke rate |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104748567B (en) * | 2015-03-27 | 2017-02-22 | 中国科学院过程工程研究所 | Sintering flue gas waste heat staged cyclic utilization and pollutant emission reducing process and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103375997A (en) * | 2012-04-28 | 2013-10-30 | 宝山钢铁股份有限公司 | Method for regulating and controlling circulating flue-gas temperature and oxygen content |
| CN203810948U (en) * | 2014-04-09 | 2014-09-03 | 中冶北方（大连）工程技术有限公司 | Emission reduction system for processing sintering exhaust gas |
| CN107419094A (en) * | 2017-08-31 | 2017-12-01 | 中冶华天工程技术有限公司 | A kind of separate system for sintering flue gas recirculation loop |
| CN110514011A (en) * | 2019-09-25 | 2019-11-29 | 北京中航泰达环保科技股份有限公司 | A kind of smoke impervious cover and the sintering flue gas circulatory system and control method |
| CN111351368A (en) * | 2020-03-11 | 2020-06-30 | 新兴铸管股份有限公司 | Method for improving circulating smoke rate |
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