CN105629933A - Raw coal bunker coal level layered monitoring method and system and power plant decentralized control method - Google Patents
Raw coal bunker coal level layered monitoring method and system and power plant decentralized control method Download PDFInfo
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- G05B19/41875—Total factory control, i.e. centrally controlling a plurality of machines, e.g. direct or distributed numerical control [DNC], flexible manufacturing systems [FMS], integrated manufacturing systems [IMS] or computer integrated manufacturing [CIM] characterised by quality surveillance of production
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Abstract
The invention provides a raw coal bunker coal level layered monitoring method and system and a power plant decentralized control method. Coal transported to a raw coal bunker is commonly transported through a belt coal transporter so that total mass of the current coal type added to the raw coal bunker can be easily obtained according to the belt weigher of the belt coal transporter. Meanwhile, the residual situation of the coal type of the lowest layer has the most attention in production, and a coal type change signal requires to be timely transmitted when the height of the coal level of the coal type of the lowest layer is low so that output mass of the coal type outputted by the raw coal bunker is acquired when the coal type is transported to the lowest layer; the residual mass of the coal type can be conveniently calculated according to the total mass and the output mass; and the current height of the coal type is determined according to the residual mass of the coal type and volume of the lowest layer of the raw coal bunker. The total mass of the certain coal type entering the raw coal bunker is monitored and the current height of the coal type is acquired in real time when the coal type is transported to the lowest layer so that replacement of the coal type can be conveniently and simply predicted.
Description
Technical Field
The invention relates to the technical field of production monitoring of thermal power plants, in particular to a raw coal bunker coal level layered monitoring method and system and a power plant decentralized control method.
Background
Due to the uneven distribution of coal resources, the change of market supply situation and the influence of various policies of the nation on coal use, a thermal power plant generally needs to burn various coal types. The production process of the thermal power plant comprises the following steps: coal entering a power plant from a vehicle or a ship is stored in a coal yard, then is sent into a raw coal bin by a belt coal conveyor, falls into a coal feeder from the raw coal bin, then enters a coal mill, and finally enters a boiler chamber for burning. Therefore, the stokehole raw coal bin is an important component of a coal pulverizing system of a coal-fired power plant, is positioned at the front end of a coal mill and provides a temporary storage space for the coal fired by a boiler. In order to ensure that the coal supply process continues, the raw coal bunker can generally provide a coal consumption of 5 to 8 hours for the coal mill. When the coal used by the power plant is more and is subjected to separate grinding and blending combustion, a plurality of kinds of coal are simultaneously stored in the raw coal bunker. When different coal types are ground and combusted in a coal feeder, a coal mill, a boiler and the like of a thermal power plant, the selected parameters are different, and the corresponding parameters need to be selected according to the coal types entering the coal feeder, the coal mill, the boiler and the like at present, so that the safe and efficient operation of equipment is ensured, and the economic benefit of coal burning is improved.
In the prior art, the method for monitoring the height of the whole coal level in the raw coal bunker is researched more frequently and commonly comprises the following steps: the methods can meet the requirements of different raw coal bunkers and provide accurate coal level height information for a Decentralized Control System (DCS) of a power plant. However, all of these schemes monitor the total height of all raw coals in the raw coal bunker, and in actual production, when a plurality of raw coals are co-fired, a plurality of raw coals exist in the raw coal bunker, namely: various raw coals are added into the raw coal bunker. Therefore, only the total height of all the raw coals in the raw coal bunker is monitored, so that the distribution condition and the residual condition of various coal types in the raw coal bunker are difficult to define visually and accurately, and particularly the residual condition of the current lowest coal type cannot be known, so that the relevant parameters of a coal mill, a boiler and the like cannot be adjusted in time according to the current coal type in the operation process.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that the remaining condition of the current lowest coal type cannot be known in the operation process and the related parameters of a coal mill, a boiler and the like cannot be adjusted in time in the prior art, so that a raw coal bunker coal level layered monitoring method and system and a power plant decentralized control method are provided.
Therefore, the technical scheme of the invention is as follows:
a raw coal bunker coal level layered monitoring method comprises the following steps:
acquiring the total mass of the current coal added into a raw coal bunker;
when the coal is conveyed to the bottommost layer, acquiring the output quality of the coal output by the raw coal bunker;
calculating the residual mass of the coal according to the total mass and the output mass;
and determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bunker.
Preferably, the obtaining of the output quality of the raw coal bunker for outputting the coal type is obtained by a model as follows:
Me: from t1Time t2The output quality of the coal is output by the raw coal bunker at the moment;
mf: and the coal feeder feeds coal in real time.
Preferably, the step of calculating the remaining mass of the coal type according to the total mass and the output mass specifically includes:
M2＝M1-Me(ii) a Wherein,
M2: the coal type is at t2The remaining mass at that moment;
M1: the coal type is at t1The remaining mass at that moment; if t1Is the initial time, then M1Is the total mass of the coal;
Me: from t1Time t2The output quality of the coal is output by the raw coal bunker at the moment.
Preferably, the step of determining the current height of the coal type according to the residual mass of the coal type and the volume of the bottom layer of the raw coal bunker comprises the following steps:
establishing a model of the coal quantity and the coal level height;
and obtaining the current height of the coal according to the residual mass of the coal and the models of the coal amount and the coal level height.
Preferably, the step of establishing a model of the coal amount and the coal level height comprises:
the bottom of the raw coal bin is a cone, and the height of the cone is h1The amount of coal can be accommodated is m1(ii) a The middle part of the raw coal bin is a circular truncated cone body, and the height of the circular truncated cone body is h2The sum of the amount of coal which can be accommodated by the cone and the circular truncated cone is m2(ii) a The top of the raw coal bin is a cylinder, and the height of the cylinder is h3The sum of the coal capacity of the cone, the circular truncated cone and the cylinder is m3；
Then the model for establishing the coal quantity and the coal level height is as follows:
when the coal amount M is less than or equal to M1When the height H of coal position is H1；
When coal amount m1＜M≤m2Height of coal level
When coal amount m2＜M≤m3Height of coal levelWherein, α1And α2Both are factors determined by the coal type and the diameter of the coal bunker.
Preferably, the raw coal bunker coal level hierarchical monitoring method further includes a step of establishing a coal quantity information database, where the database at least includes: the method comprises the following steps of (1) coal types corresponding to coal beds, the sequence of the coal beds in a raw coal bunker in sequence and the height of each coal bed, wherein the step of establishing the database comprises the following steps:
acquiring the coal type of the coal bed on the uppermost layer of the raw coal bunker and the overall coal level height of the raw coal bunker;
acquiring the coal type on a belt coal conveyer and the newly increased quality of the coal type on the belt coal conveyer which is about to fall into a raw coal bin;
judging whether the coal type on the belt coal conveyor is the same as the coal type of the coal bed at the uppermost layer of the raw coal bunker, if so, judging that the mass of the coal type of the coal bed at the uppermost layer of the raw coal bunker is equal to the original mass plus the newly added mass; if not, a new coal seam is added as a new uppermost coal seam, the coal type of the coal seam is the coal type on a belt coal conveyor, and the quality of the coal seam is the added quality;
and obtaining the height of the coal type of the uppermost coal layer in the raw coal bunker according to the integral coal level height and the model of the coal amount and the coal level height.
Preferably, the step of determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bunker further comprises the step of generating a height signal according to the current height and sending the height signal; or
The step of determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bunker further comprises the following steps: and judging whether the current height is smaller than a preset threshold value, and if so, generating a replacement signal and sending the replacement signal.
Preferably, the raw coal bunker coal level layering monitoring method further comprises the step of obtaining the retention time of the coal type of the bottommost coal layer in the raw coal bunker according to the residual quality of the coal type.
A power plant decentralized control method comprises the following steps:
acquiring a height signal or a replacement signal by adopting the raw coal bunker coal level layered monitoring method;
judging whether coal type information needs to be replaced or not according to the height signal or the replacing signal;
if the coal type information needs to be replaced, acquiring the coal type of a coal layer above the current coal type;
and adjusting parameters for control in the power plant decentralized control system to parameters corresponding to the coal type.
A raw coal bunker coal level layered monitoring system, comprising:
the total mass obtaining module is used for obtaining the total mass of the current coal added into the raw coal bunker;
the acquisition output quality module is used for acquiring the output quality of the raw coal bunker for outputting the coal type when the coal type is conveyed to the bottommost layer;
the residual mass obtaining module is used for calculating the residual mass of the coal according to the total mass and the output mass;
and the current height obtaining module is used for determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bunker.
The technical scheme of the invention has the following advantages:
1. according to the raw coal bunker coal level layered monitoring method and system provided by the invention, because the coal conveyed to the raw coal bunker is generally conveyed through the belt coal conveyer, the total mass of the current coal added into the raw coal bunker can be easily obtained according to a belt scale of the belt coal conveyer. Meanwhile, the most concerned in production is the residual condition of the lowest-layer coal, and because a signal for replacing the coal needs to be sent out in time when the coal level of the lowest-layer coal is low, the output quality of the coal output by the raw coal bunker is obtained when the coal is conveyed to the lowest layer; the residual mass of the coal can be conveniently calculated according to the total mass and the output mass; and determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bin. The method and the system provided by the invention can conveniently and simply predict the change of the coal type, improve the economic benefit of fire coal and ensure the operation safety of equipment by monitoring the total quality of a certain coal type entering a raw coal bunker and acquiring the current height of the coal type in real time when the coal type is conveyed to the bottommost layer.
2. According to the raw coal bunker coal level layered monitoring method and system, the time integral is carried out on the preset time range through the real-time coal feeding rate of the coal feeder, so that the output quality of the coal within the time range is obtained, and the method and system are simple and easy to implement and convenient to use.
3. According to the raw coal bunker coal level layered monitoring method and system, the raw coal bunker is divided into three sections of the cone, the round table body and the cylinder from bottom to top in sequence, the structural characteristics of most raw coal bunkers are met, and then a model of the corresponding coal level height is designed when the coal output quantity is in different sections of the raw coal bunker, so that the accuracy and the reliability of prediction are improved.
4. The invention provides a method and a system for monitoring coal level of a raw coal bunker in a layered manner, and a coal quantity information database is established, wherein the database at least comprises the following components: the coal types corresponding to the coal beds, the sequence of the coal beds in the raw coal bunker and the height of each coal bed are convenient for later calling and visual display.
5. According to the raw coal bunker coal level layered monitoring method and the raw coal bunker coal level layered monitoring system, the time of the coal type of the bottommost coal bed remaining in the raw coal bunker can be obtained according to the residual quality of the coal type, so that the time can be conveniently displayed to workers in real time, and the residual condition of the bottommost coal type can be further conveniently monitored.
6. The power plant decentralized control method provided by the invention receives the height signal or the replacing signal, judges whether the coal type information needs to be replaced according to the height signal or the replacing signal, and acquires the coal type of the coal layer above the current coal type if the coal type information needs to be replaced; and parameters used for control in the power plant decentralized control system are adjusted to be parameters corresponding to the type of the coal to be changed into the bottommost layer.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a specific example of a raw coal bunker coal level layered monitoring method in embodiment 1 of the present invention;
FIG. 2 is a schematic structural diagram of a raw coal bunker in the method for layered monitoring of coal positions of the raw coal bunker in embodiment 1 of the present invention;
fig. 3 is a schematic block diagram of a specific example of a system for monitoring coal in-situ stratification of a raw coal bunker in embodiment 3 of the present invention;
reference numerals: 1-obtaining a total mass module; 2-obtaining an output quality module; 3-obtaining a residual mass module; 4-obtain the current height module.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1, this embodiment provides a raw coal bunker coal level layered monitoring method, which may include the following steps:
s1: and acquiring the total mass of the current coal added into the raw coal bunker. Since the coal transported into the raw coal bunker is generally transported by the belt conveyor, the total mass of the current coal type added to the raw coal bunker can be easily obtained according to the belt scale of the belt conveyor.
S2: and when the coal is conveyed to the bottommost layer, acquiring the output quality of the coal output by the raw coal bunker. Since the remaining situation of the lowest coal type is the most concerned in the production, since the signal for replacing the coal type needs to be issued in time when the coal level of the lowest coal type is low, the step S2 is executed when the coal type is transported to the lowest floor, which simplifies the procedure.
In step S2, the output quality of the coal type output by the raw coal bunker may be obtained at intervals according to practical situations, such as at intervals of 5S, or 10S, etc. When the coal level of the lowest coal seam is still higher, the output quality can be acquired at a longer interval, and if the coal level of the lowest coal seam is lower, the output quality can be acquired at a shorter interval, and the output quality can be set as required. The output quality can be obtained by the following model:
wherein M ise: from t1Time t2The output quality of the coal is output by the raw coal bunker at the moment; m isf: and the coal feeder feeds coal in real time. Since the real-time coal feeding rate of the coal feeder can be conveniently obtained from a DSC system of a power plant, the real-time coal feeding rate of the coal feeder is adjusted to a preset time range (such as t:)1Time t2Time) is integrated, and then the output quality of the coal within the time range is obtained.
S3: and calculating the residual mass of the coal according to the total mass and the output mass. The specific implementation manner of the step can be as follows: m2＝M1-Me(ii) a Wherein M is2: the coal type is at t2The remaining mass at that moment; m1: the coal type is at t1The remaining mass at that moment; if t1At the initial time (i.e., the time when the coal type is changed to the lowest coal type), M1Is the total mass of the coal; me: from t1Time t2The output quality of the coal is output by the raw coal bunker at the moment.
S4: determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bunker, namely: fig. 2 shows a schematic diagram of 1,2 … … n coal seams in a raw coal bunker, where the current height of the lowest coal type is the height of the interface 1-2 between coal type 1 and coal type 2. The step may specifically include:
firstly, establishing a model of coal quantity and coal level height;
and secondly, obtaining the current height of the coal according to the established model of the residual mass of the coal and the coal amount and the coal level height.
As shown in fig. 2, the raw coal bunker has a structure that: and the model is divided into three sections, namely a cone (the position of the coal bed 1), a circular truncated cone (the position of the coal bed 2) and a cylinder (the position of the coal bed 3-n) from bottom to top, so that the corresponding relation between the coal quantity of the raw coal bunker and the coal level height is established by dividing the model into three sections, and the model is more accurate. The method specifically comprises the following steps:
firstly, the bottom of a raw coal bunker is set as a cone, and the height of the cone is h1The amount of coal can be accommodated is m1(ii) a The middle part of the raw coal bin is a round table body, and the height of the round table body is h2The total amount of coal which can be accommodated by the cone and the circular truncated cone is m2(ii) a The top of the raw coal bin is a cylinder, and the height of the cylinder is h3The total amount of coal contained in the cone, the truncated cone and the cylinder is m3；
Then, establishing a model of the coal amount and the coal level height as follows:
when the coal amount M is less than or equal to M1When the height H of coal position is H1；
When coal amount m1＜M≤m2Height of coal level
When coal amount m2＜M≤m3Height of coal levelWherein, α1And α2The coefficients are determined by the coal type and the diameter of the coal bunker, and can be obtained by performing data fitting according to the diameter of the raw coal bunker to be monitored and the type of the coal type.
In actual use, the height of the cone in the most common raw coal bunker in a power plant is h12m, the amount of coal can be accommodated1110 t; the height of the truncated cone is h22m, the total amount of coal which can be accommodated by the cone and the circular truncated cone is m2200 t; the top of the raw coal bin is a cylinder, and the height of the cylinder is h3The total amount of coal contained in the cone, the truncated cone and the cylinder is m3524 t. The model of the coal amount and the coal level height is shown in table 1. Meanwhile, the time of the coal type of the bottommost coal bed remaining in the raw coal bunker can be obtained according to the residual quality of the coal type, so that the time can be conveniently displayed to workers in real time, and the residual condition of the bottommost coal type can be further conveniently monitored.
Table 1:
according to the raw coal bunker coal level layered monitoring method provided by the invention, the total quality of a certain coal type entering the raw coal bunker is monitored, and the current height of the coal type is obtained in real time when the coal type is conveyed to the bottommost layer, so that the replacement of the coal type is conveniently and simply predicted, the economic benefit of fire coal is improved, and the operation safety of equipment is ensured.
On the basis of the above scheme, the raw coal bunker coal level hierarchical monitoring method provided in this embodiment may further include a step of establishing a coal quantity information database, where the database at least includes: the method comprises the following steps of (1) coal types corresponding to coal beds, the sequence of the coal beds in a raw coal bunker in sequence and the height of each coal bed, wherein the step of establishing the database comprises the following steps:
firstly, the coal type of the coal layer at the uppermost layer of the raw coal bunker and the overall coal level height of the raw coal bunker are obtained. The overall coal level is obtained in a variety of ways known in the art and will not be described in detail herein.
And secondly, acquiring the coal type on the belt coal conveyor and the newly added quality of the coal type on the belt coal conveyor to fall into a raw coal bin. The mass can likewise be obtained by means of a belt scale of a belt conveyor.
Further, judging whether the coal type on the belt coal conveyor is the same as the coal type of the coal bed at the uppermost layer of the raw coal bunker, if so, judging that the quality of the coal type of the coal bed at the uppermost layer of the raw coal bunker is equal to the original quality plus the added quality; if the coal seam is different from the belt coal conveyor, a new coal seam is added as a new uppermost coal seam, the coal type of the coal seam is the coal type on the belt coal conveyor, and the quality of the coal seam is the newly added quality;
and finally, obtaining the height of the coal type of the coal bed at the uppermost layer in the raw coal bunker according to the overall coal level height and the model of the coal amount and the coal level height. And determining the section of the model of the coal quantity and the coal level height of the current uppermost coal level according to the overall coal level height.
Through establishing the database, later-stage calling and visual display are facilitated, such as: the coal level layering is visually displayed, and meanwhile, the deeper the color is, the higher the heat value of the coal is, so that the coal level layering is visualized and convenient to monitor.
On the basis of the above scheme, step S4 may further include a step of sending a current altitude generation altitude signal, that is: determine whether it is necessaryThe coal type is changed by judging through a power plant decentralized control system; or after the step S4, determining whether the current height is less than a preset threshold (the threshold may be the height h of the cone at the bottom of the raw coal bunker)1Adding a preset value, if the current h is1If the value is 2m, the threshold may be a value between 2m and 4m, preferably 3m), and if the value is smaller than the threshold, a replacement signal is generated and transmitted, that is, the step of: the signal sent is that the replacement is needed. The specific mode is flexibly set according to the actual condition.
Example 2
The embodiment provides a power plant decentralized control method, which may include the following steps:
adopting the coal position layering monitoring method of the original coal bunker in the embodiment 1 to obtain a height signal or a replacement signal;
and judging whether the coal type information needs to be replaced or not according to the height signal or the replacing signal. If the received height signal is the height signal, the current height of the current bottommost coal type contained in the height signal can be obtained, whether the current height is smaller than a preset threshold value or not is judged, and if the current height is smaller than the preset threshold value, the coal type signal is judged to need to be replaced; and if the received signal is a replacing signal, directly judging whether the coal type information needs to be replaced according to the yes or no of the replacing signal.
If the coal type information needs to be replaced, acquiring the coal type of a coal layer above the current coal type;
and adjusting parameters for control in the power plant distributed control system to be parameters corresponding to the type of the coal to be changed into the bottommost layer. The parameters used for control may be: the method is used for controlling relevant parameters of the coal mill, the boiler and the like.
The power plant decentralized control method provided by the embodiment can timely adjust relevant parameters of the coal mill, the boiler and the like, ensures the operation safety of equipment and improves the economic benefit of coal burning.
On the basis of the scheme, the method can also realize the statistics of the real-time coal consumption of the unit, the accumulated coal consumption of the unit, the total coal consumption of the power plant and the real-time coal consumption of various coal types.
Example 3
As shown in fig. 3, the present embodiment provides a raw coal bunker coal level layered monitoring system, including:
the total mass obtaining module 1 is used for obtaining the total mass of the current coal added into the raw coal bunker;
the acquisition output quality module 2 is used for acquiring the output quality of the coal output by the raw coal bunker when the coal is conveyed to the bottommost layer;
the residual mass obtaining module 3 is used for calculating the residual mass of the coal according to the total mass and the output mass;
and the current height obtaining module 4 is used for determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bunker.
According to the raw coal bunker coal level layered monitoring system provided by the embodiment, coal conveyed to the raw coal bunker is generally conveyed through the belt coal conveyer, so that the total mass of the current coal types added into the raw coal bunker can be easily obtained according to a belt scale of the belt coal conveyer. Meanwhile, the most concerned in production is the residual condition of the lowest-layer coal, and because a signal for replacing the coal needs to be sent out in time when the coal level of the lowest-layer coal is low, the output quality of the coal output by the raw coal bunker is obtained when the coal is conveyed to the lowest layer; the residual mass of the coal can be conveniently calculated according to the total mass and the output mass; and determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bin. The system can conveniently and simply predict the replacement of the coal types by monitoring the total quality of a certain coal type entering the raw coal bunker and acquiring the current height of the coal type in real time when the coal type is conveyed to the bottommost layer, thereby improving the economic benefit of fire coal and ensuring the operation safety of equipment.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A raw coal bunker coal level layered monitoring method is characterized by comprising the following steps:
acquiring the total mass of the current coal added into a raw coal bunker;
when the coal is conveyed to the bottommost layer, acquiring the output quality of the coal output by the raw coal bunker;
calculating the residual mass of the coal according to the total mass and the output mass;
and determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bunker.
2. The method of claim 1, wherein the obtaining of the output quality of the raw coal bin outputting the coal is obtained by a model comprising:
Me: from t1Time t2The output quality of the coal is output by the raw coal bunker at the moment;
mf: and the coal feeder feeds coal in real time.
3. The method according to claim 2, wherein the step of calculating the remaining mass of the coal type from the total mass and the output mass specifically comprises:
M2＝M1-Me(ii) a Wherein,
M2: the coal type is at t2The remaining mass at that moment;
M1: the coal type is at t1The remaining mass at that moment; if t1Is the initial time, then M1Is the total mass of the coal;
Me: from t1Time t2The output quality of the coal is output by the raw coal bunker at the moment.
4. A method according to any one of claims 1 to 3, wherein the step of determining the current height of the coal species from the residual mass of the coal species and the volume of the raw coal bunker floor comprises:
establishing a model of the coal quantity and the coal level height;
and obtaining the current height of the coal according to the residual mass of the coal and the models of the coal amount and the coal level height.
5. The method of claim 4, wherein the step of modeling the coal volume and the coal level height comprises:
the bottom of the raw coal bin is a cone, and the height of the cone is h1The amount of coal can be accommodated is m1(ii) a The middle part of the raw coal bin is a circular truncated cone body, and the height of the circular truncated cone body is h2The sum of the amount of coal which can be accommodated by the cone and the circular truncated cone is m2(ii) a The top of the raw coal bin is a cylinder, and the height of the cylinder is h3The sum of the coal capacity of the cone, the circular truncated cone and the cylinder is m3；
Then the model for establishing the coal quantity and the coal level height is as follows:
when the coal amount M is less than or equal to M1When the height H of coal position is H1；
When coal amount m1＜M≤m2Height of coal level
When coal amount m2＜M≤m3Height of coal levelWherein, α1And α2Both are factors determined by the coal type and the diameter of the coal bunker.
6. The method according to claim 4 or 5, further comprising the step of establishing a coal amount information database, wherein the database at least comprises: the method comprises the following steps of (1) coal types corresponding to coal beds, the sequence of the coal beds in a raw coal bunker in sequence and the height of each coal bed, wherein the step of establishing the database comprises the following steps:
acquiring the coal type of the coal bed on the uppermost layer of the raw coal bunker and the overall coal level height of the raw coal bunker;
acquiring the coal type on a belt coal conveyer and the newly increased quality of the coal type on the belt coal conveyer which is about to fall into a raw coal bin;
judging whether the coal type on the belt coal conveyor is the same as the coal type of the coal bed at the uppermost layer of the raw coal bunker, if so, judging that the mass of the coal type of the coal bed at the uppermost layer of the raw coal bunker is equal to the original mass plus the newly added mass; if not, a new coal seam is added as a new uppermost coal seam, the coal type of the coal seam is the coal type on a belt coal conveyor, and the quality of the coal seam is the added quality;
and obtaining the height of the coal type of the uppermost coal layer in the raw coal bunker according to the integral coal level height and the model of the coal amount and the coal level height.
7. The method of claim 1, wherein the step of determining the current height of the coal species based on the remaining mass of the coal species and the volume of the raw coal bunker floor is followed by the step of generating a height signal from the current height; or
The step of determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bunker further comprises the following steps: and judging whether the current height is smaller than a preset threshold value, and if so, generating a replacement signal and sending the replacement signal.
8. The method of claim 1, further comprising the step of deriving a retention time of the coal species in the bottommost coal seam in the raw coal bunker based on a remaining mass of the coal species.
9. A power plant decentralized control method is characterized by comprising the following steps:
obtaining a height signal or a replacement signal by using the raw coal bunker coal level layering monitoring method of claim 7;
judging whether coal type information needs to be replaced or not according to the height signal or the replacing signal;
if the coal type information needs to be replaced, acquiring the coal type of a coal layer above the current coal type;
and adjusting parameters for control in the power plant decentralized control system to parameters corresponding to the coal type.
10. The utility model provides a raw coal bunker coal position layering monitoring system which characterized in that includes:
the total mass obtaining module (1) is used for obtaining the total mass of the current coal added into the raw coal bunker;
the acquisition output quality module (2) is used for acquiring the output quality of the coal output by the raw coal bunker when the coal is conveyed to the bottommost layer;
a residual mass obtaining module (3) for calculating the residual mass of the coal type according to the total mass and the output mass;
and the current height obtaining module (4) is used for determining the current height of the coal according to the residual mass of the coal and the volume of the bottom layer of the raw coal bunker.
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