CN116162752A

CN116162752A - Coordinated control method, system, equipment and storage medium for coal injection and powder preparation

Info

Publication number: CN116162752A
Application number: CN202310192518.9A
Authority: CN
Inventors: 高瑞峰; 雷晓平
Original assignee: Beijing Heroopsys Technology Co ltd
Current assignee: Beijing Heroopsys Technology Co ltd
Priority date: 2023-03-02
Filing date: 2023-03-02
Publication date: 2023-05-26

Abstract

The embodiment of the invention discloses a coordinated control method, a coordinated control system, coordinated control equipment and a coordinated control storage medium for coal injection and coal preparation, wherein the coordinated control method, the coordinated control equipment and the coordinated control storage medium are used for carrying out coal injection and coal preparation of a blast furnace according to preset initial parameters, and detecting control parameters in the coal injection and coal preparation process; carrying out safety verification processing on the control parameters by utilizing boundary conditions to obtain a verified coal injection pulverizing process; for the coal injection and pulverizing process passing verification, gradually increasing the coal feed flow of the coal feeder, thereby increasing the load of the coal mill, adjusting a flue gas furnace valve according to the inlet and outlet pressure differences of the coal mill and the outlet temperature of the coal mill, obtaining the coal injection and pulverizing process of which the load of the flue gas furnace is matched with the load of the coal mill, and continuously adjusting the coal feed flow of the coal feeder according to the current change trend of the coal mill, thus obtaining the optimal coal injection and pulverizing process; and in the coal injection and pulverizing process, safety precaution is carried out according to the precaution parameters of the flue gas furnace. The embodiment of the invention can effectively improve the working efficiency of coal injection and pulverizing, and has high safety and stability.

Description

Coordinated control method, system, equipment and storage medium for coal injection and powder preparation

Technical Field

The embodiment of the invention relates to the field of machine learning, in particular to a coal injection and pulverizing coordinated control method, a system, equipment and a storage medium.

Background

The existing blast furnace coal injection and powder preparation technology cannot ensure automatic control when the carbon monoxide content and the oxygen content of the waste gas of the blast furnace hot blast stove fluctuate, manual intervention or manual operation is needed, and meanwhile, the coal injection part and the powder preparation process in the prior art are in isolated control, and cannot be controlled cooperatively, so that the efficiency of each part in the coal injection and powder preparation process is unbalanced, and the working efficiency of coal injection and powder preparation is lower.

The existing blast furnace hot blast stove coal injection and powder preparation technology is difficult to maintain timely adjustment of continuously-changing working conditions due to manual operation, so that the safety and stability of the blast furnace coal injection and powder preparation are insufficient.

Disclosure of Invention

Therefore, the embodiment of the invention provides a coordinated control method, a coordinated control system, coordinated control equipment and a coordinated control storage medium for coal injection and coal preparation, so as to solve the problems of low efficiency and insufficient safety and stability of the existing coal injection and coal preparation technology.

In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:

according to a first aspect of an embodiment of the present invention, there is provided a coordinated control method for coal injection and pulverizing, the method including:

carrying out blast furnace coal injection and pulverization according to preset initial parameters, and detecting to obtain control parameters in the coal injection and pulverization process;

Carrying out safety verification processing on the control parameters by utilizing preset boundary conditions, ensuring safety and stability of the coal injection and pulverizing process, and obtaining a verified coal injection and pulverizing process;

for the coal injection and pulverizing process passing verification, gradually increasing the coal feeding flow of a coal feeder so as to increase the load of the coal mill, and adjusting a flue gas furnace valve according to the inlet and outlet pressure difference of the coal mill and the outlet temperature of the coal mill to obtain the coal injection and pulverizing process of which the load of the flue gas furnace is matched with the load of the coal mill, and aiming at the coal injection and pulverizing process of which the load of the flue gas furnace is matched with the load of the coal mill, continuously adjusting the coal feeding flow of the coal feeder according to the current change trend of the coal mill to obtain the optimal coal injection and pulverizing process;

and in the coal injection and pulverizing process, the carbon monoxide content at the inlet of the coal mill and the oxygen content at the inlet of the coal mill are used as smoke furnace early warning parameters, and safety early warning is carried out according to the smoke furnace early warning parameters.

Further, according to preset initial parameters, carrying out blast furnace coal injection and pulverization, and detecting to obtain control parameters in the coal injection and pulverization process, wherein the method comprises the following steps:

presetting an initial coal feeding flow set value;

and carrying out coal injection and pulverizing according to the initial coal feeding flow set value, and detecting control parameters in the coal injection and pulverizing process, wherein the control parameters comprise a coal feeding flow detection value, a coal powder bin weighing value, a coal mill inlet-outlet pressure difference, a coal mill inlet waste gas carbon monoxide content, a coal mill inlet waste gas oxygen content, a coal mill inlet waste gas temperature, a flue gas furnace gas flow, a flue gas furnace air flow, a flue gas furnace outlet waste gas flow and a coal mill running current.

Further, the control parameters are subjected to safety verification processing by utilizing preset boundary conditions, so that the safety and stability of the coal injection and pulverizing process are ensured, and the verified coal injection and pulverizing process is obtained, which comprises the following steps:

judging whether the weighing value of the pulverized coal bin is within a preset weighing range or not;

if the weighing value of the pulverized coal bin is not within the preset weighing range, the weighing value of the pulverized coal bin does not meet the boundary condition;

if the coal powder bin weighing value is within a preset weighing range, the coal powder bin weighing value meets a boundary condition;

judging whether the differential pressure of an inlet and an outlet of the coal mill is within a preset differential pressure range or not;

if the differential pressure of the inlet and the outlet of the coal mill is not within the preset differential pressure range, the differential pressure of the inlet and the outlet of the coal mill does not meet the boundary condition;

if the differential pressure of the inlet and the outlet of the coal mill is within a preset differential pressure range, the differential pressure of the inlet and the outlet of the coal mill meets the boundary condition;

judging whether the carbon monoxide content of the inlet waste gas of the coal mill is within a preset waste gas carbon monoxide content range;

if the carbon monoxide content of the inlet exhaust gas of the coal mill is not within the preset exhaust gas carbon monoxide content range, the carbon monoxide content of the inlet of the coal mill does not meet the boundary condition;

If the carbon monoxide content of the inlet exhaust gas of the coal mill is within the preset exhaust gas carbon monoxide content range, the carbon monoxide content of the inlet of the coal mill meets the boundary condition;

judging whether the oxygen content of the inlet exhaust gas of the coal mill is within a preset exhaust gas oxygen content range;

if the oxygen content of the inlet exhaust gas of the coal mill is not within the preset exhaust gas oxygen content range, the oxygen content of the inlet exhaust gas of the coal mill does not meet the boundary condition;

if the oxygen content of the inlet exhaust gas of the coal mill is within a preset exhaust gas oxygen content range, the oxygen content of the inlet exhaust gas of the coal mill meets a boundary condition;

judging whether the inlet exhaust gas temperature of the coal mill is within a preset exhaust gas temperature range;

if the inlet exhaust gas temperature of the coal mill is not within the preset exhaust gas temperature range, the inlet exhaust gas temperature of the coal mill does not meet the boundary condition;

if the inlet exhaust gas temperature of the coal mill is within a preset exhaust gas temperature range, the inlet exhaust gas temperature of the coal mill meets the boundary condition;

judging whether the running current of the coal mill is within a preset current range or not;

if the running current of the coal mill is not within the preset current range, the running current of the coal mill does not meet the boundary condition;

If the coal mill operating current is within a preset current range, the coal mill operating current meets a boundary condition;

judging whether the weighing value of the coal dust bin, the inlet and outlet pressure difference of the coal mill, the carbon monoxide content of the inlet waste gas of the coal mill, the oxygen content of the inlet waste gas of the coal mill, the inlet waste gas temperature of the coal mill and the running current of the coal mill all meet boundary conditions;

if one or more parameters of the coal powder bin weighing value, the coal mill inlet-outlet pressure difference, the coal mill inlet exhaust gas carbon monoxide content, the coal mill inlet exhaust gas oxygen content, the coal mill inlet exhaust gas temperature and the coal mill running current do not meet the boundary conditions, resetting an initial coal feeding flow set value, and carrying out coal injection and powder preparation again by using the newly set initial coal feeding flow set value and carrying out boundary verification;

and if the weighing value of the coal powder bin, the inlet and outlet pressure difference of the coal mill, the carbon monoxide content of the inlet waste gas of the coal mill, the oxygen content of the inlet waste gas of the coal mill, the inlet waste gas temperature of the coal mill and the running current of the coal mill all meet the boundary conditions, taking the current coal injection and powder preparation process as the coal injection and powder preparation process passing the boundary verification.

Further, the control parameters are subjected to safety verification processing by utilizing preset boundary conditions, so that the safety and stability of the coal injection and pulverizing process are ensured, and the verified coal injection and pulverizing process is obtained, and the method further comprises the following steps:

calculating the coal feeding flow error by using the detected coal feeding flow detection value and the coal feeding flow set value in the coal injection pulverizing process passing the boundary verification;

judging whether the coal feeding flow error is smaller than a preset coal feeding flow error threshold value or not;

if the coal feeding flow error is larger than or equal to a preset coal feeding flow error threshold, the coal feeding flow of the current coal injection and pulverizing coal feeder is unstable, waiting until the coal feeding flow of the coal feeder is stable within a preset waiting time, and if the coal feeding flow of the coal feeder is unstable within the preset waiting time, ending the coal injection and pulverizing process;

if the coal feeding flow error is smaller than the preset coal feeding flow error threshold, the coal feeding flow of the current coal injection and pulverizing coal feeder is stable, and the coal injection and pulverizing process passing the safety verification is obtained.

Further, for the coal injection and pulverizing process passing verification, gradually increasing the coal feed flow of the coal feeder, thereby increasing the load of the coal mill, and adjusting a flue gas furnace valve according to the pressure difference between an inlet and an outlet of the coal mill and the outlet temperature of the coal mill, thereby obtaining a coal injection and pulverizing process of which the load of the flue gas furnace is suitable for the load of the coal mill, aiming at the coal injection and pulverizing process of which the load of the flue gas furnace is suitable for the load of the coal mill, continuously adjusting the coal feed flow of the coal feeder according to the current change trend of the coal mill, thereby obtaining a preferable coal injection and pulverizing process, comprising:

For the coal injection and pulverizing process passing the safety verification, increasing the current coal supply flow set value according to a first preset value, and performing coal injection and pulverizing by utilizing the increased coal supply flow set value;

judging whether the pressure difference of an inlet and an outlet of the coal mill is increased after the coal feeding flow set value is lifted and whether the outlet temperature of the coal mill is reduced after the coal feeding flow set value is lifted;

if the inlet and outlet pressure difference of the coal mill is increased after the coal feeding flow set value is increased and the outlet temperature of the coal mill is reduced after the coal feeding flow set value is increased, the load of the coal mill in the current coal injection and pulverizing process is larger than the load of a flue gas furnace, and a gas valve, an air valve and an exhaust gas induced draft fan valve of the flue gas furnace are synchronously regulated to enable the load of the flue gas furnace to be matched with the load of the coal mill, so that the coal injection and pulverizing process with the load of the flue gas furnace being matched with the load of the coal mill is obtained;

if the inlet and outlet pressure difference of the coal mill after the coal feeding flow set value is increased is not increased or the outlet temperature of the coal mill after the coal feeding flow set value is increased is not reduced, the load of the coal mill in the current coal injection and pulverizing process is smaller than or equal to the load of a gas furnace, and the current coal injection and pulverizing process is taken as the coal injection and pulverizing process with the load of the gas furnace being matched with the load of the coal mill;

Judging whether the coal mill operation current in the coal injection and pulverizing process of which the load of the flue gas furnace is matched with that of the coal mill is in an increasing trend or not;

if the coal mill operation current in the coal injection and pulverizing process, which is suitable for the load of the flue gas furnace and the load of the coal mill, is in an increasing trend, the current load of the coal mill does not reach the upper limit of the load of the coal mill, and the current coal injection and pulverizing process is performed by circulating to the current coal feeding flow set value according to the first preset value and using the lifted coal feeding flow set value;

if the coal mill operation current of the coal injection and pulverizing process, which is suitable for the load of the flue gas furnace and the load of the coal mill, is in a trend of decreasing or unchanged, the current load of the coal mill reaches the upper limit of the load of the coal mill, the current coal feeding flow set value is decreased according to the second preset value, and the coal injection and pulverizing process, which is obtained after the decrease of the coal feeding flow set value, is used as the optimal coal injection and pulverizing process.

Further, the gas valve, the air valve and the exhaust gas induced draft fan valve of the gas furnace are synchronously adjusted to enable the load of the gas furnace to be matched with the load of the coal mill, so that a coal injection and pulverizing process with the load of the gas furnace being matched with the load of the coal mill is obtained, and the method comprises the following steps:

obtaining the deviation of the inlet exhaust gas temperature of the coal mill by using the detected inlet exhaust gas temperature of the coal mill and a preset inlet exhaust gas temperature set value of the coal mill;

Inputting the temperature deviation of the inlet waste gas of the coal mill into a preset flue gas furnace gas flow calculation model to obtain a flue gas furnace gas flow calculation value;

obtaining flue gas flow deviation by using the calculated flue gas flow value and the detected flue gas flow;

detecting pressure fluctuation of a gas pipe network of the flue gas furnace to obtain a feed-forward of the gas pressure of the flue gas furnace;

inputting the gas flow deviation of the flue gas furnace and the gas pressure feedforward of the flue gas furnace into a preset control model to obtain gas valve control parameters;

adjusting the gas valve of the flue gas furnace according to the gas valve control parameters to obtain an adjusted gas valve;

obtaining the deviation of the carbon monoxide content of the inlet of the coal mill by using the detected carbon monoxide content of the inlet of the coal mill and a preset carbon monoxide content set value of the inlet of the coal mill;

inputting the deviation of the carbon monoxide content of the inlet of the coal mill into a preset flue gas furnace air flow calculation model to obtain a flue gas furnace air flow calculation value;

obtaining flue gas furnace air flow deviation by using the flue gas furnace air flow calculated value and the detected flue gas furnace air flow;

Inputting the air flow deviation of the flue gas furnace into a preset control model to obtain air valve control parameters;

adjusting the air valve of the flue gas furnace according to the air valve control parameters to obtain an air valve after adjustment;

obtaining the differential pressure deviation of the inlet and the outlet of the coal mill by using the detected differential pressure of the inlet and the outlet of the coal mill and a preset differential pressure set value of the inlet and the outlet of the coal mill;

obtaining flow fluctuation feedforward of the coal feeder according to fluctuation conditions of a coal feeding flow detection value of the coal feeder;

obtaining flue gas flow feedforward of the flue gas furnace according to the detected fluctuation condition of the flue gas flow of the flue gas furnace outlet;

inputting the differential pressure deviation of the inlet and outlet of the coal mill, the flow fluctuation feedforward of the coal feeder and the exhaust gas flow feedforward of the flue gas furnace into a preset control model to obtain the control parameters of the valve of the exhaust gas induced draft fan;

adjusting the exhaust gas induced draft fan valve of the flue gas furnace according to the exhaust gas induced draft fan valve control parameters to obtain an adjusted exhaust gas induced draft fan valve;

and obtaining the coal injection and pulverizing process of which the load of the flue gas furnace is matched with that of the coal mill by using the gas valve, the air valve and the exhaust gas induced draft fan valve after the adjustment.

Further, in the coal injection and pulverizing process, the carbon monoxide content at the inlet of the coal mill and the oxygen content at the inlet of the coal mill are used as smoke furnace early warning parameters, and safety early warning is carried out according to the smoke furnace early warning parameters, and the method comprises the following steps:

in the coal injection and pulverizing process, detecting the carbon monoxide content at the inlet of the coal mill and the oxygen content at the inlet of the coal mill in real time;

judging whether the detected carbon monoxide content of the inlet of the coal mill is larger than the upper limit of the carbon monoxide content of the inlet of the preset coal mill;

if the detected carbon monoxide content of the inlet of the coal mill is larger than the preset upper limit of the carbon monoxide content of the inlet of the coal mill, the first early warning condition is met;

if the detected carbon monoxide content of the inlet of the coal mill is smaller than or equal to the preset upper limit of the carbon monoxide content of the inlet of the coal mill, the first early warning condition is not met;

judging whether the detected inlet oxygen content of the coal mill is larger than the preset inlet oxygen content upper limit of the coal mill;

if the detected inlet oxygen content of the coal mill is larger than the preset inlet oxygen content upper limit of the coal mill, the second early warning condition is met;

if the detected inlet oxygen content of the coal mill is smaller than or equal to the preset inlet oxygen content upper limit of the coal mill, the second early warning condition is not met;

Judging whether the first early warning condition and the second early warning condition are met or not;

if the first early warning condition and/or the second early warning condition are/is not met, a safety early warning mode is not required to be started;

if the first early warning condition and the second early warning condition are met, a safety early warning mode is started, wherein the safety early warning mode comprises stopping a coal feeder and a coal mill, opening a fume furnace bleeding valve, closing a fume furnace waste gas induced draft fan valve and performing heat preservation operation on the fume furnace.

According to a second aspect of the embodiment of the present invention, there is provided a coal injection and pulverizing coordinated control system, the system including:

the parameter monitoring module is used for carrying out blast furnace coal injection and powder preparation according to preset initial parameters, and detecting to obtain control parameters in the coal injection and powder preparation process;

the safety verification module is used for carrying out safety verification processing on the control parameters by utilizing preset boundary conditions, ensuring safety and stability of the coal injection and powder preparation process and obtaining a verified coal injection and powder preparation process;

the coordination optimizing module is used for gradually increasing the coal feeding flow of the coal feeder for the verified coal injection and pulverizing process, so as to increase the load of the coal mill, adjusting a flue gas furnace valve according to the inlet and outlet pressure difference of the coal mill and the outlet temperature of the coal mill, obtaining the coal injection and pulverizing process of which the flue gas furnace load is suitable for the load of the coal mill, and continuously adjusting the coal feeding flow of the coal feeder according to the current change trend of the coal mill aiming at the coal injection and pulverizing process of which the flue gas furnace load is suitable for the load of the coal mill, so as to obtain the optimal coal injection and pulverizing process;

And the safety early warning module is used for carrying out safety early warning according to the smoke furnace early warning parameters by using the carbon monoxide content at the inlet of the coal mill and the oxygen content at the inlet of the coal mill as the smoke furnace early warning parameters in the coal injection and pulverizing process.

presetting an initial coal feeding flow set value;

According to a third aspect of the embodiment of the present invention, there is provided a coal injection and pulverizing coordinated control apparatus, the apparatus including: a processor and a memory;

the memory is used for storing one or more program instructions;

the processor is configured to execute one or more program instructions to perform the steps of a coal injection and pulverizing coordinated control method according to any one of the above claims.

According to a fourth aspect of embodiments of the present invention, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of a coal injection and pulverizing coordinated control method as described in any one of the above.

The embodiment of the invention has the following advantages:

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those of ordinary skill in the art that the drawings in the following description are exemplary only and that other implementations can be obtained from the extensions of the drawings provided without inventive effort.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the invention, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present invention, should fall within the ambit of the technical disclosure.

Fig. 1 is a schematic diagram of a logic structure of a coordinated control system for coal injection and pulverizing according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of a coordinated control method for coal injection and powder preparation according to an embodiment of the present invention;

FIG. 3 is a schematic flow chart of a coal injection pulverizing process according to an embodiment of the present invention;

FIG. 4 is a second schematic flow chart of a coal injection and pulverizing process according to the embodiment of the present invention;

FIG. 5 is a schematic flow chart of a coal injection and pulverizing process based on coordinated control according to an embodiment of the present invention;

FIG. 6 is a schematic flow chart of a gas valve for a flue gas furnace according to an embodiment of the present invention;

FIG. 7 is a schematic flow chart of an air valve for a flue gas stove according to an embodiment of the present invention;

FIG. 8 is a schematic flow chart of a valve for adjusting an exhaust draught fan of a flue gas furnace according to an embodiment of the invention;

fig. 9 is a schematic flow chart of safety pre-warning by using flue gas furnace pre-warning parameters according to an embodiment of the present invention.

Detailed Description

Other advantages and advantages of the present invention will become apparent to those skilled in the art from the following detailed description, which, by way of illustration, is to be read in connection with certain specific embodiments, 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.

Referring to fig. 1, an embodiment of the present invention provides a coordinated control system for coal injection and pulverizing, which specifically includes: the system comprises a parameter monitoring module 1, a safety verification module 2, a coordination optimizing module 3 and a safety early warning module 4.

Further, the parameter monitoring module 1 is used for carrying out coal injection and pulverization of the blast furnace according to preset initial parameters, and detecting to obtain control parameters in the coal injection and pulverization process; the safety verification module 2 is used for carrying out safety verification processing on the control parameters by utilizing preset boundary conditions, ensuring safety and stability of the coal injection and powder preparation process and obtaining a verified coal injection and powder preparation process; the coordination optimizing module 3 is used for gradually increasing the coal feeding flow of the coal feeder for the verified coal injection and pulverizing process, so as to increase the load of the coal mill, adjusting a flue gas furnace valve according to the inlet and outlet pressure difference of the coal mill and the outlet temperature of the coal mill, obtaining the coal injection and pulverizing process of which the load of the flue gas furnace is suitable for the load of the coal mill, and continuously adjusting the coal feeding flow of the coal feeder according to the current change trend of the coal mill aiming at the coal injection and pulverizing process of which the load of the flue gas furnace is suitable for the load of the coal mill, so as to obtain the optimal coal injection and pulverizing process; and the safety early warning module 4 is used for carrying out safety early warning according to the smoke furnace early warning parameters by utilizing the carbon monoxide content at the inlet of the coal mill and the oxygen content at the inlet of the coal mill as the smoke furnace early warning parameters in the coal injection and pulverizing process.

The embodiment of the invention discloses a coal injection and powder preparation coordinated control system, which comprises the steps of firstly, carrying out blast furnace coal injection and powder preparation according to preset initial parameters, and detecting control parameters in the coal injection and powder preparation process; carrying out safety verification processing on the control parameters by utilizing boundary conditions to obtain a verified coal injection pulverizing process; for the coal injection and pulverizing process passing verification, gradually increasing the coal feed flow of the coal feeder, thereby increasing the load of the coal mill, adjusting a flue gas furnace valve according to the inlet and outlet pressure differences of the coal mill and the outlet temperature of the coal mill, obtaining the coal injection and pulverizing process of which the load of the flue gas furnace is matched with the load of the coal mill, and continuously adjusting the coal feed flow of the coal feeder according to the current change trend of the coal mill, thus obtaining the optimal coal injection and pulverizing process; and in the coal injection and pulverizing process, safety precaution is carried out according to the precaution parameters of the flue gas furnace. The embodiment of the invention can effectively improve the working efficiency of coal injection and pulverizing, and has high safety and stability.

Corresponding to the above disclosed coal injection and powder preparation coordinated control system, the embodiment of the invention also discloses a coal injection and powder preparation coordinated control method. The following describes a coal injection and pulverization coordinated control system in detail, which is disclosed in the embodiment of the invention.

With reference to fig. 2, the following describes specific steps of a coordinated control method for coal injection and pulverization according to an embodiment of the present invention.

And carrying out blast furnace coal injection and powder preparation according to preset initial parameters by the parameter monitoring module 1, and detecting to obtain control parameters in the coal injection and powder preparation process.

The steps specifically comprise: the coal injection and pulverizing technology consists of six parts, namely a gas furnace, a coal mill, a coal feeder, bag dust removal, a coal powder bin and a chimney. Mixing high-temperature flue gas generated by burning coal gas and air in a flue gas furnace combustion chamber with low-temperature waste gas discharged by a blast furnace hot blast stove in a flue gas furnace air mixing chamber to generate a hot gas desiccant containing a certain carbon monoxide (CO) content and a certain oxygen (O) content, and using the hot gas desiccant for coal mill powder production; the flue gas furnace gas valve is used for controlling the outlet temperature of the flue gas furnace, the flue gas furnace air valve is used for controlling and coordinating the carbon monoxide content and the oxygen content of flue gas furnace waste gas, the hot-blast stove waste gas induced draft fan valve is used for controlling the inlet and outlet pressure difference of the coal mill, and the coal feeder is used for controlling the pulverizing quantity of the coal mill.

Presetting an initial coal feeding flow set value of a coal feeder; and carrying out coal injection and pulverizing processes according to the initial coal feed flow set value, and detecting control parameters in the coal injection and pulverizing processes by utilizing detectors arranged at all nodes, wherein the control parameters comprise a coal feed flow detection value, a coal powder bin weighing value, a coal mill inlet and outlet pressure difference, a coal mill inlet waste gas carbon monoxide content, a coal mill inlet waste gas oxygen content, a coal mill inlet waste gas temperature, a flue gas furnace gas flow, a flue gas furnace air flow, a flue gas furnace outlet waste gas flow and a coal mill running current.

The safety verification module 2 performs safety verification processing on the control parameters by utilizing preset boundary conditions, ensures the safety and stability of the coal injection and pulverizing process, and obtains the verified coal injection and pulverizing process.

Referring to fig. 3 and 4, the steps specifically include: after the whole coal injection and pulverizing process enters a stable state, judging whether the weighing value of the coal powder bin is within a preset weighing range or not; if the weighing value of the pulverized coal bin is not within the preset weighing range, the weighing value of the pulverized coal bin does not meet the boundary condition; if the weighing value of the pulverized coal bin is within the preset weighing range, the weighing value of the pulverized coal bin meets the boundary condition; judging whether the differential pressure of an inlet and an outlet of the coal mill is within a preset differential pressure range or not; if the differential pressure of the inlet and the outlet of the coal mill is not within the preset differential pressure range, the differential pressure of the inlet and the outlet of the coal mill does not meet the boundary condition; if the differential pressure of the inlet and the outlet of the coal mill is within the preset differential pressure range, the differential pressure of the inlet and the outlet of the coal mill meets the boundary condition; judging whether the carbon monoxide content of the inlet waste gas of the coal mill is within a preset waste gas carbon monoxide content range; if the carbon monoxide content of the inlet exhaust gas of the coal mill is not within the preset exhaust gas carbon monoxide content range, the carbon monoxide content of the inlet of the coal mill does not meet the boundary condition; if the carbon monoxide content of the inlet exhaust gas of the coal mill is within the preset exhaust gas carbon monoxide content range, the carbon monoxide content of the inlet of the coal mill meets the boundary condition; judging whether the oxygen content of the inlet exhaust gas of the coal mill is within a preset exhaust gas oxygen content range; if the oxygen content of the inlet exhaust gas of the coal mill is not within the preset exhaust gas oxygen content range, the oxygen content of the inlet exhaust gas of the coal mill does not meet the boundary condition; if the oxygen content of the inlet exhaust gas of the coal mill is within the preset exhaust gas oxygen content range, the oxygen content of the inlet exhaust gas of the coal mill meets the boundary condition; judging whether the inlet exhaust gas temperature of the coal mill is within a preset exhaust gas temperature range; if the inlet exhaust gas temperature of the coal mill is not within the preset exhaust gas temperature range, the inlet exhaust gas temperature of the coal mill does not meet the boundary condition; if the inlet exhaust gas temperature of the coal mill is within the preset exhaust gas temperature range, the inlet exhaust gas temperature of the coal mill meets the boundary condition; judging whether the running current of the coal mill is within a preset current range; if the running current of the coal mill is not within the preset current range, the running current of the coal mill does not meet the boundary condition; if the coal mill operating current is within the preset current range, the coal mill operating current meets the boundary condition.

Judging whether the weighing value of the coal powder bin, the inlet and outlet pressure difference of the coal mill, the carbon monoxide content of the inlet exhaust gas of the coal mill, the oxygen content of the inlet exhaust gas of the coal mill, the inlet exhaust gas temperature of the coal mill and the running current of the coal mill all meet the boundary conditions; if one or more parameters of the weighing value of the coal powder bin, the inlet and outlet pressure difference of the coal mill, the carbon monoxide content of the waste gas at the inlet of the coal mill, the oxygen content of the waste gas at the inlet of the coal mill, the temperature of the waste gas at the inlet of the coal mill and the running current of the coal mill do not meet the boundary conditions, the current coal injection and pulverizing process is indicated to have potential safety hazards, an initial coal injection flow set value is required to be reset, the coal injection and pulverizing process is carried out again by utilizing the newly set initial coal injection flow set value, and the safety verification process is repeated until the boundary verification is passed; and if the weighing value of the coal powder bin, the inlet and outlet pressure difference of the coal mill, the carbon monoxide content of the inlet exhaust gas of the coal mill, the oxygen content of the inlet exhaust gas of the coal mill, the inlet exhaust gas temperature of the coal mill and the running current of the coal mill all meet the boundary conditions, taking the current coal injection and pulverizing process as the coal injection and pulverizing process passing the boundary verification.

For the coal injection and pulverizing process passing the boundary verification; calculating to obtain a coal feeding flow error by using the detected coal feeding flow detection value and the coal feeding flow set value; judging whether the coal feeding flow error is smaller than a preset coal feeding flow error threshold value or not; if the coal feeding flow error is larger than or equal to a preset coal feeding flow error threshold, the coal feeding flow of the coal feeder for coal injection and pulverizing at present is unstable, the coal feeding flow has larger fluctuation, the coal feeding flow of the coal feeder needs to wait until the coal feeding flow of the coal feeder is stable within a preset waiting time, if the coal feeding flow of the coal feeder is always unable to be unstable within the preset waiting time, the coal injection and pulverizing process is terminated, and whether the coal feeder has faults is checked; if the coal feeding flow error is smaller than the preset coal feeding flow error threshold, the coal feeding flow of the current coal injection and pulverizing coal feeder is stable, and the coal injection and pulverizing process passing the safety verification is obtained.

The coordinated optimizing module 3 gradually increases the coal feeding flow of the coal feeder for the coal injection and pulverizing process passing verification, so as to increase the load of the coal mill, and adjusts a flue gas furnace valve according to the pressure difference between an inlet and an outlet of the coal mill and the outlet temperature of the coal mill, so as to obtain the coal injection and pulverizing process of which the load of the flue gas furnace is matched with the load of the coal mill, and continuously adjusts the coal feeding flow of the coal feeder according to the current change trend of the coal mill aiming at the coal injection and pulverizing process of which the load of the flue gas furnace is matched with the load of the coal mill, so as to obtain the optimal coal injection and pulverizing process.

Referring to fig. 5, the steps specifically include: for the coal injection and pulverizing process passing the safety verification, lifting the current coal supply flow set value according to a first preset value, and performing coal injection and pulverizing by utilizing the lifted coal supply flow set value; after the coal injection and pulverizing process enters a stable state, judging whether the pressure difference of an inlet and an outlet of the coal mill is increased after the coal feeding flow set value is increased and whether the outlet temperature of the coal mill is reduced after the coal feeding flow set value is increased; if the pressure difference between the inlet and the outlet of the coal mill after the coal feeding flow set value is lifted is not increased or the outlet temperature of the coal mill after the coal feeding flow set value is lifted is not reduced, the coal mill load in the current coal injection and milling process is smaller than or equal to the smoke furnace load, and the current coal injection and milling process is directly used as the coal injection and milling process with the smoke furnace load and the coal mill load being adapted; if the pressure difference between the inlet and the outlet of the coal mill after the coal feeding flow set value is increased and the outlet temperature of the coal mill after the coal feeding flow set value is increased is reduced, the coal mill load in the current coal injection and pulverizing process is larger than the load of the flue gas furnace, and the load of the flue gas furnace and the load of the coal mill are adapted by synchronously adjusting a gas valve, an air valve and a waste gas induced draft fan valve of the flue gas furnace.

Referring to fig. 6, the specific adjustment steps of the gas valve of the gas stove include: obtaining the deviation of the inlet exhaust gas temperature of the coal mill by using the detected inlet exhaust gas temperature of the coal mill and a preset inlet exhaust gas temperature set value of the coal mill; inputting the temperature deviation of the inlet waste gas of the coal mill into a preset flue gas furnace gas flow calculation model to obtain a flue gas furnace gas flow calculation value; obtaining flue gas flow deviation by utilizing the flue gas flow calculated value and the detected flue gas flow; detecting pressure fluctuation of a gas pipe network of the gas furnace to obtain gas pressure feedforward of the gas furnace, wherein the gas pressure feedforward of the gas furnace is used for rapidly reacting the influence of the fluctuation of the gas pressure on the gas flow; inputting the gas flow deviation of the flue gas furnace and the gas pressure feedforward of the flue gas furnace into a preset control model to obtain gas valve control parameters, wherein the preset control model is preset in a control module; and adjusting the gas valve of the flue gas furnace according to the gas valve control parameters to obtain the adjusted gas valve.

Referring to fig. 7, the specific adjusting steps of the air valve of the gas stove include: obtaining the deviation of the carbon monoxide content of the inlet of the coal mill by using the detected carbon monoxide content of the inlet of the coal mill and a preset carbon monoxide content set value of the inlet of the coal mill; inputting the deviation of the carbon monoxide content of the inlet of the coal mill into a preset flue gas furnace air flow calculation model to obtain a flue gas furnace air flow calculation value; obtaining flue gas furnace air flow deviation by utilizing the flue gas furnace air flow calculated value and the detected flue gas furnace air flow; inputting the air flow deviation of the flue gas furnace into a preset control model to obtain air valve control parameters; and adjusting the air valve of the flue gas furnace according to the air valve control parameters to obtain the air valve after adjustment.

Referring to fig. 8, the specific adjusting steps of the exhaust gas induced draft fan valve of the above-mentioned flue gas stove include: obtaining the differential pressure deviation of the inlet and the outlet of the coal mill by using the detected differential pressure of the inlet and the outlet of the coal mill and a preset differential pressure set value of the inlet and the outlet of the coal mill; according to fluctuation conditions of a coal feeding flow detection value of a coal feeder, obtaining flow fluctuation feedforward of the coal feeder, wherein the flow fluctuation feedforward of the coal feeder is used for rapidly reflecting influence of fluctuation of the coal feeding flow on pressure difference of an inlet and an outlet of a mill; obtaining flue gas flow feedforward of the flue gas furnace according to the detected fluctuation condition of the flue gas flow of the outlet of the flue gas furnace, wherein the flue gas flow feedforward of the flue gas furnace is used for reflecting the influence of the fluctuation of the flue gas flow on the pressure difference of an inlet and an outlet of a coal mill; inputting the differential pressure deviation of an inlet and an outlet of the coal mill, the flow fluctuation feedforward of the coal feeder and the exhaust gas flow feedforward of the flue gas furnace into a preset control model to obtain the control parameters of a valve of an exhaust gas induced draft fan; and adjusting the exhaust gas induced draft fan valve of the flue gas furnace according to the exhaust gas induced draft fan valve control parameters to obtain an adjusted exhaust gas induced draft fan valve.

After the adjustment of each valve of the flue gas furnace is completed, the coal injection and pulverizing process of which the load of the flue gas furnace is suitable for the load of the coal mill is obtained by using the coal gas valve, the air valve and the exhaust gas induced draft fan valve which are completed in adjustment.

Judging whether the coal mill operation current of the coal injection and pulverizing process which is suitable for the load of the flue gas furnace and the load of the coal mill is in an increasing trend after the load of the flue gas furnace is matched with the load of the coal mill, wherein the coal mill operation current can be increased along with the increase of the coal feeding flow under a certain condition, and when the coal feeding flow is increased to a certain amount, the mill current can be reduced along with the increase of the coal feeding amount; if the coal mill operation current in the coal injection and pulverizing process, which is suitable for the load of the flue gas furnace and the load of the coal mill, is in an increasing trend, the current load of the coal mill does not reach the upper limit of the load of the coal mill, and a space for improving the load of the coal mill is still reserved, the current coal feeding flow set value is lifted according to a first preset value, and coal injection and pulverizing are carried out by utilizing the lifted coal feeding flow set value; if the coal mill running current of the coal injection and pulverizing process with the load of the flue gas furnace and the load of the coal mill being suitable for is in a trend of decreasing or unchanged, the current coal mill load is indicated to reach the upper limit of the load of the coal mill, the current coal feeding flow set value is decreased according to the second preset value, the coal injection and pulverizing process with the decreased coal feeding flow set value is used as the optimal coal injection and pulverizing process, and the step can ensure the stability of the coal injection and pulverizing process on the premise of having higher coal injection and pulverizing efficiency.

The embodiment of the invention regards the blast furnace coal pulverizing and spraying process as a whole, and improves the coal pulverizing and spraying efficiency as much as possible under the condition that the weighing value of the coal powder bin is not over the upper limit, and the specific method comprises the following steps: the coal feeding flow of the coal feeder is continuously improved, the load of the coal mill is improved, the load of the flue gas furnace is matched with the load of the coal mill by cooperatively adjusting the gas valve, the air valve and the exhaust gas induced draft fan valve of the flue gas furnace, and finally, the coal injection and pulverizing process is optimized by utilizing the running current change trend of the coal mill, so that the high-efficiency coal injection and pulverizing is realized.

And in the coal injection and pulverizing process, the safety early warning module 4 uses the carbon monoxide content at the inlet of the coal mill and the oxygen content at the inlet of the coal mill as smoke furnace early warning parameters, and carries out safety early warning according to the smoke furnace early warning parameters.

Referring to fig. 9, the steps specifically include: in the whole coal injection and pulverizing process, detecting the carbon monoxide content at the inlet of the coal mill and the oxygen content at the inlet of the coal mill in real time; judging whether the detected carbon monoxide content of the inlet of the coal mill is larger than the upper limit of the carbon monoxide content of the inlet of the preset coal mill; if the detected carbon monoxide content of the inlet of the coal mill is larger than the preset upper limit of the carbon monoxide content of the inlet of the coal mill, the first early warning condition is met; if the detected carbon monoxide content of the inlet of the coal mill is smaller than or equal to the preset upper limit of the carbon monoxide content of the inlet of the coal mill, the first early warning condition is not met; judging whether the detected inlet oxygen content of the coal mill is larger than the preset inlet oxygen content upper limit of the coal mill; if the detected inlet oxygen content of the coal mill is greater than the preset upper limit of the inlet oxygen content of the coal mill, the second early warning condition is met; if the detected inlet oxygen content of the coal mill is smaller than or equal to the preset inlet oxygen content upper limit of the coal mill, the second early warning condition is not met; judging whether the first early warning condition and the second early warning condition are met; if the first early warning condition and/or the second early warning condition are/is not met, a safety early warning mode is not required to be started; if the first early warning condition and the second early warning condition are met, a safety early warning mode is started, wherein the safety early warning mode comprises stopping a coal feeder and a coal mill, opening a smoke furnace relief valve, closing a smoke furnace waste gas induced draft fan valve and performing heat preservation operation on the smoke furnace, and the safety early warning mode is kept until early warning is released.

According to the embodiment of the invention, when the carbon monoxide content and the oxygen content of the waste gas in the inlet of the coal mill exceed the standard, the safety early warning mode is started, the safe operation of the coal injection and pulverizing system is ensured, and the safety and stability of the coal injection and pulverizing process are ensured.

The embodiment of the invention discloses a coordinated control method for coal injection and powder preparation, which comprises the steps of firstly, carrying out blast furnace coal injection and powder preparation according to preset initial parameters, and detecting control parameters in the coal injection and powder preparation process; carrying out safety verification processing on the control parameters by utilizing boundary conditions to obtain a verified coal injection pulverizing process; for the coal injection and pulverizing process passing verification, gradually increasing the coal feed flow of the coal feeder, thereby increasing the load of the coal mill, adjusting a flue gas furnace valve according to the inlet and outlet pressure differences of the coal mill and the outlet temperature of the coal mill, obtaining the coal injection and pulverizing process of which the load of the flue gas furnace is matched with the load of the coal mill, and continuously adjusting the coal feed flow of the coal feeder according to the current change trend of the coal mill, thus obtaining the optimal coal injection and pulverizing process; and in the coal injection and pulverizing process, safety precaution is carried out according to the precaution parameters of the flue gas furnace. The embodiment of the invention can effectively improve the working efficiency of coal injection and pulverizing, and has high safety and stability.

In addition, the embodiment of the invention also provides a coal injection and pulverizing coordinated control device, which comprises: a processor and a memory; the memory is used for storing one or more program instructions; the processor is configured to execute one or more program instructions to perform the steps of a coal injection and pulverizing coordinated control method according to any one of the above claims.

In addition, the embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and the computer program realizes the steps of the coal injection and powder preparation coordinated control method according to any one of the above steps when being executed by a processor.

In the embodiment of the invention, the processor may be an integrated circuit chip with signal processing capability. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components.

The disclosed methods, steps, and logic blocks in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The processor reads the information in the storage medium and, in combination with its hardware, performs the steps of the above method.

The storage medium may be memory, for example, may be volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory.

The nonvolatile memory may be a Read-only memory (R-oxy M), a programmable Read-only memory (Pr-oxy-grangmabler-oxy-M), an erasable programmable Read-only memory (erasblepr-oxy-M, EPR-oxy-M), an electrically erasable programmable Read-only memory (electrically EPR-oxy-M, EEPR-oxy-M), or a flash memory.

The volatile memory may be a Random Access Memory (RAM) which serves as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous SLDRAM (SLDRAM), and direct memory bus RAM (DRRAM).

The storage media described in embodiments of the present invention are intended to comprise, without being limited to, these and any other suitable types of memory.

Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present invention may be implemented in a combination of hardware and software. When the software is applied, the corresponding functions may be stored in a computer-readable medium or transmitted as one or more instructions or code on the computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

While the invention has been described in detail in the foregoing general description and specific examples, it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.

Claims

1. The coordinated control method for coal injection and powder preparation is characterized by comprising the following steps:

2. The coordinated control method for coal injection and powder preparation according to claim 1, wherein the control parameters in the coal injection and powder preparation process are detected and obtained by performing blast furnace coal injection and powder preparation according to preset initial parameters, and the coordinated control method comprises the following steps:

Presetting an initial coal feeding flow set value;

3. The coordinated control method for coal injection and pulverization according to claim 2, wherein the safety verification processing is performed on the control parameters by using preset boundary conditions to ensure the safety and stability of the coal injection and pulverization process, and the verified coal injection and pulverization process is obtained, comprising:

4. The coordinated control method of coal injection and pulverization according to claim 3, wherein the control parameters are subjected to safety verification processing by using preset boundary conditions, the safety and stability of the coal injection and pulverization process are ensured, and the verified coal injection and pulverization process is obtained, further comprising:

5. The coordinated control method for coal injection and pulverization according to claim 4, wherein for the coal injection and pulverization process passing verification, the coal injection and pulverization flow rate of a coal feeder is gradually increased, so as to increase the load of the coal mill, and a flue gas furnace valve is adjusted according to the inlet-outlet pressure difference of the coal mill and the outlet temperature of the coal mill, so as to obtain a coal injection and pulverization process of which the load of the flue gas furnace is matched with the load of the coal mill, and for the coal injection and pulverization process of which the load of the flue gas furnace is matched with the load of the coal mill, the coal injection and pulverization flow rate of the coal feeder is continuously adjusted according to the current change trend of the coal mill, so as to obtain a preferable coal injection and pulverization process, comprising:

6. The coordinated control method for coal injection and pulverization according to claim 5, wherein the coal injection and pulverization process in which the load of the flue gas furnace is adapted to the load of the coal mill by synchronously adjusting the gas valve, the air valve and the exhaust gas induced draft fan valve of the flue gas furnace is obtained, comprises:

7. The coordinated control method for coal injection and powder preparation according to claim 6, wherein during coal injection and powder preparation, carbon monoxide content at an inlet of a coal mill and oxygen content at an inlet of the coal mill are used as smoke furnace early warning parameters, and safety early warning is performed according to the smoke furnace early warning parameters, and the method comprises the following steps:

8. A coal injection and pulverizing coordinated control system, the system comprising:

9. A coal injection and pulverizing coordinated control device, characterized in that the device comprises: a processor and a memory;

the memory is used for storing one or more program instructions;

the processor is configured to execute one or more program instructions for performing the steps of a coal injection and pulverizing coordinated control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and the computer program when executed by a processor implements the steps of a coal injection and pulverizing coordinated control method according to any one of claims 1 to 7.