A coal-fired power plant multi-coal storage decision method and system

Abstract

The present application provides a kind of coal-fired power plant multi-coal storage decision method, steps include: input coal quality, coal quantity;From digital coal yard system, obtain the three-dimensional shape of coal storage, coal type and coal quality, storage time;According to the shape data of coal storage, determine the coal storage space, calculate the coal storage volume of coal storage space, obtain the boundary coal quality information of coal storage space;Through the combination of existing coal storage space, find all the coal storage space combination of coal storage, form the initial scheme set of coal storage;According to the principle of less pile, the principle of similar coal quality, the principle of burning old and storing new, and the principle of easy-to-take coal, score all schemes in the initial scheme set of coal storage, and calculate the total score of each scheme by using weighted summation method;According to the order from high to low of the total score of scheme, output all coal storage schemes or the first i coal storage schemes.The present application solves the difficulty of lacking quantitative evaluation index and not easy to operate in coal storage decision.

Description

Technical Field

[0001] The present invention belongs to the field of coal-fired power generation, and in particular relates to a method and system for making decisions on storage of multiple types of coal in a coal-fired power plant. Background Art

[0002] Due to limited coal market supply, coal-fired power plants cannot always use the designated coal type as fuel. Mixed coal combustion is a common fuel operation method currently adopted by coal-fired power plants. Many power plants have a complex and diverse coal supply, often using several or even dozens of different types. Power plants often have limited coal yard space, making it impossible to store each type of coal separately. This inevitably leads to the problem of mixed coal stacking. To determine how to stack this diverse coal supply in the coal yard, it is necessary to determine a storage plan for the power plant's coal supply. For a specific amount of coal, a reasonable storage plan can be determined within the multiple available spaces in the coal yard. Based on the principles of classified stacking, reducing the number of separate piles, burning old coal and retaining new coal, and ensuring easy access, the goal is to reduce coal loss in the coal yard, ensure accurate future retrieval of stored coal, and improve coal yard space utilization. Although the coal storage objectives and principles of coal-fired power plants are well known, achieving these objectives in accordance with these principles is difficult to implement. The main reason is that the principles for coal storage in coal yards are vague and qualitative descriptions, while the objectives are diverse and difficult to quantify and meet simultaneously. This makes it difficult to develop an optimal decision-making method for achieving coal storage in coal yards.

[0003] In the existing literature, the intelligent stacking calculation module involved in the patent "An Intelligent Coal Dispatching System for Thermal Power Plants" (authorization announcement number CN102541036) has the following goals: "to transmit a coal stacking instruction to an online coal stacking unit, receive the coal stacking position, coal type and total amount of coal stacking from the online coal stacking unit, determine the available idle coal stacking position for the current coal stacking operation based on the coal stacking position and its total amount of coal stacking; make a stacking decision based on the current incoming coal type, the available idle coal stacking position and the predetermined stacking rules to select the best coal stacking position for the coal type, and store the stacking information containing the best coal stacking position information in the stacking unit." The patent states that "the instructions are transmitted to the stacker-reclaimer unit", and proposes that "stacking rules include similar coal quality rules, uniform stacking rules and no-stacking rules", and "the no-stacking rules, similar coal quality rules and uniform stacking rules are used in turn to filter the optional idle coal stacking positions, and finally determine the optimal coal stacking position". It can be seen that the relevant description of the intelligent stacking calculation module involved in this patent only describes the well-known goals and principles in coal yard storage decisions. As for how to achieve these goals and principles, the patent does not disclose any clear and operational methods or systems for realizing its functions. Summary of the Invention

[0004] The present invention proposes a method for making decisions on storage of multiple types of coal in a coal-fired power plant, which is characterized by comprising the steps of:

[0005] (1) Input the coal quality and quantity;

[0006] (2) Obtain the three-dimensional shape, coal type and quality, and storage time of the coal stored in the coal yard from the digital coal yard system or the coal yard coal counting instrument system;

[0007] (3) Analyze the coal storage shape data in the coal yard, determine the available coal storage space, number each coal storage space, calculate the available coal volume of the available coal storage space, and obtain the coal quality information of the coal storage space boundary from the digital coal yard system;

[0008] (4) Find all coal storage space combinations whose coal storage volume is greater than the incoming coal volume from the existing storage space by combining them to form a preliminary coal storage plan set;

[0009] (5) All the plans in the initial coal storage plan set are scored according to the principle of fewer piles, the principle of similar coal quality, the principle of burning old and retaining new, and the principle of easy access to coal, and are recorded as C1, C2, C3, and C4 in sequence. The total score C of each plan is calculated using the weighted sum method;

[0010] (6) Output all coal storage plans or the first i coal storage plans in order of the total scores from high to low.

[0011] The coal quality includes: calorific value Q, moisture M, ash A, volatile matter V, sulfur S, and coal ash softening temperature T.

[0012] The three-dimensional shape of the coal stored in the coal yard refers to the height of the coal stored at each plane position in the coal yard.

[0013] The method for determining the coal storage space is as follows: analyzing the highest boundary line of the coal yard, and dividing the coal storage boundary into upslope, downslope and flat bottom according to the rate of change of the highest boundary line of the coal yard with the coal dropping position. Any space between the coal yard boundary and upslope, between the coal yard boundary and downslope, between adjacent downslopes and upslopes, and the upper part of the flat bottom that does not reach the maximum coal storage height is a coal storage space.

[0014] For a strip coal yard, the highest boundary line of the coal yard refers to the coal level height data at the straight line position where the coal dropping point is located; for a circular coal yard, the highest boundary line of the coal yard refers to the coal level height data at the circular position where the coal dropping point is located.

[0015] The coal at the boundary of the coal storage space refers to the coal that has surface contact with the coal storage space.

[0016] The method for calculating the coal storable volume of the coal storage space is: based on the coal storage repose angle and the three-dimensional shape data of the coal stored in the coal yard, with the coal storage height not exceeding the maximum coal storage height limit and the coal storage not overflowing into other spaces, the volume numerical integration method is used for calculation.

[0017] The calculation rule of the score C1 of the principle of less points is:

[0018] C1=C1,max -n

[0019] in:

[0020] C 1,max The highest score for C1;

[0021] n is the number of coal storage spaces included in the coal storage plan.

[0022] The calculation rules for the coal quality similarity score C2 are as follows:

[0023]

[0024] in:

[0025] C 2,max The highest score for item C2;

[0026] Q l 、M l 、A l 、V l 、S l 、T l They are the calorific value, moisture, ash, volatile matter, sulfur content and ash softening temperature of the incoming coal;

[0027] Q c 、M c 、A c 、V c 、S c 、T c They are the calorific value, moisture, ash, volatile matter, sulfur content and ash softening temperature of the coal at the boundary of the coal storage space;

[0028] Q Δ 、M Δ 、A Δ 、V Δ 、S Δ 、T Δ They are the interval quantities of calorific value, moisture, ash, volatile matter, sulfur content and ash softening temperature;

[0029] x Q 、x M 、x A 、x V 、x S 、x T The scoring weights are calorific value, moisture, ash, volatile matter, sulfur content, and ash softening temperature, which can be set by the coal yard manager according to the actual needs of the power plant, but must meet x Q +x M +x A +x V +x S +x T =1.

[0030] The calculation rule of the burn-out-and-retain-new principle score C3 is:

[0031]

[0032] in:

[0033] C 3,max The highest score for item C3;

[0034] V F The volume of coal at the boundary of the coal storage space covered by the coal storage space;

[0035] V Z is the total volume of coal at the boundary of the coal storage space;

[0036] t F The number of days that the coal at the boundary of the coal storage space is stored;

[0037] t Z The maximum allowable storage days for coal at the boundary of the coal storage space.

[0038] The calculation rule of the easy access to coal principle score C4 is:

[0039]

[0040] in:

[0041] C 4,max The highest score for item C4;

[0042] V x is the total volume of coal required to be fed into the furnace in the next m days at the boundary of the coal storage space.

[0043] When there are multiple types of boundary coal in the coal storage space, each type of boundary coal is calculated using the calculation rules of C2, C3, and C4, and then the weighted average is calculated based on the volume of each boundary coal covered by the coal storage space.

[0044] The calculation rules for the total score C of each scheme are as follows:

[0045] C=C1x1+C2x2+C3x3+C4x4

[0046] Among them: x1, x2, x3, and x4 are the weights of C1, C2, C3, and C4 respectively, which can be set by the coal yard manager according to the actual needs of the power plant, but are required to satisfy x1+x2+x3+x4=1.

[0047] The weight of each principle (x1, x2, x3, x4) and the maximum score (C 1,max 、C 2,max 、C 3,max 、C 4,max) can be set by the coal yard manager according to the actual needs of the power plant.

[0048] A multi-coal storage decision system for a coal-fired power plant, characterized in that the system comprises a coal tray shape processing module, a coal storage space calculation module, a coal storage plan construction module, a coal storage plan evaluation module, and a coal storage plan selection module;

[0049] The coal pan shape processing module is used to obtain coal pan data from the digital coal yard system or the coal pan meter system and format it into coal yard location-coal storage height data;

[0050] The coal storage space calculation module is used to calculate the number of coal storage spaces, the volume of coal storage spaces, boundary coal quality information, and the volume of boundary coal covered by the coal storage spaces;

[0051] The coal storage plan building module is used to generate a preliminary coal storage plan set;

[0052] The coal storage scheme evaluation module is used to calculate the total score of each scheme in the coal storage initial scheme set according to the calculation rule of the scheme total score C;

[0053] The coal storage plan selection module selects the first i plans in descending order of C according to the number of optimization plans set by the user and outputs them to the user.

[0054] The method and system for making decisions on the storage of multiple coal types in a coal-fired power plant quantitatively evaluate the principles of fewer piles, similar coal quality, burning old and storing new, and easy access to coal that must be met in the storage of multiple coal types in a coal-fired power plant, and form a method for calculating the total score of coal storage plans with adjustable weights. The multi-coal storage decision system based on this method can realize automated decision-making on incoming coal storage plans, solving the difficulties of existing coal storage decisions, such as the lack of quantitative evaluation indicators, vague principles, and difficulty in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 Schematic diagram of the steps for decision-making on storage of multiple coal types in coal-fired power plants.

[0056] Figure 2 This is a schematic diagram of the multi-coal storage decision-making system for coal-fired power plants.

[0057] Figure 3 This is a three-dimensional schematic diagram of the highest boundary line of coal storage in a circular coal yard.

[0058] Figure 4 This is a plan diagram of the highest boundary line of coal storage in a circular coal yard. DETAILED DESCRIPTION

[0059] The following describes a specific implementation of a method and system for making decisions on the storage of multiple types of coal in a coal-fired power plant with reference to the accompanying drawings. Figure 1The method comprises the following six steps: (1) inputting coal quality information and coal quantity information such as incoming coal volume; (2) obtaining the three-dimensional shape, coal type and quality, and storage time of the coal stored in the coal yard from the digital coal yard system or the coal yard coal counting instrument system; (3) analyzing the coal storage shape data of the coal yard, determining the coal storage space, numbering each coal storage space, calculating the coal storage volume of the coal storage space, and obtaining the coal quality information of the boundary coal of the coal storage space from the digital coal yard system; (4) finding all coal storage space combinations whose sum of coal storage volumes is greater than the incoming coal volume from the existing coal storage spaces by combination, and forming a set of preliminary coal storage plans; (5) scoring all plans in the set of preliminary coal storage plans according to the principle of few piles, the principle of similar coal quality, the principle of burning old and storing new, and the principle of easy access to coal, and recording them as C1, C2, C3, and C4 in sequence, and using the weighted summation method to calculate the total score C of each plan; (6) outputting all coal storage plans or the first i coal storage plans with the highest total score C in the order of the total scores of the plans from high to low.

[0060] Required coal quality information includes: calorific value Q, moisture M, ash content A, volatile matter V, sulfur content S, and ash softening temperature T. The three-dimensional shape of the coal stored in the coal yard refers to the height of the coal stored at each plane position in the coal yard. Coal at the boundary of the coal storage space refers to the coal that has surface contact with the coal storage space.

[0061] The method for determining the coal storage space is as follows: analyze the highest boundary line of the coal yard, and divide the coal storage boundary into upslope, downslope and flat bottom according to the rate of change of the highest boundary line of the coal yard with the coal dropping position. Any space between the coal yard boundary and upslope, between the coal yard boundary and downslope, between adjacent downslopes and upslopes, and the upper part of the flat bottom that has not reached the highest coal storage height is a coal storage space. For strip coal yards, the highest boundary line of the coal yard refers to the coal level height data at the straight position of the coal dropping point of the coal yard; for circular coal yards, the highest boundary line of the coal yard refers to the coal level height data at the circular position of the coal dropping point of the coal yard. An example of a highest boundary line of a circular coal yard is as follows: Figure 3 , where #1, #2...#8 are the numbers of the coal storage spaces. Figure 4 Shown Figure 3 The specific meaning of the coordinate axis in a circular coal yard. In a strip coal yard, the position in the length direction of the coal yard needs to be used instead of the angular position of the circular coal yard.

[0062] The method for calculating the storable coal volume of the coal storage space is as follows: based on the coal storage repose angle and the three-dimensional shape data of the coal stored in the coal yard, the coal storage height does not exceed the maximum coal storage height limit and the stored coal does not overflow into other spaces, and the volume numerical integration method is used for calculation.

[0063] The calculation rules for the total score C of each plan are as follows:

[0064] C=C1x1+C2x2+C3x3+C4x4

[0065] Among them: x1, x2, x3, x4 are the weights of C1, C2, C3, and C4 respectively, which can be set by the coal yard manager according to the actual needs of the power plant, but it is required to satisfy x1+x2+x3+x4=1. The scoring calculation rules for each sub-item are as follows

[0066] (1) The calculation rules for the score C1 of the principle of less points are as follows:

[0067] C1=C 1,max -n

[0068] in:

[0069] C 1,max The highest score for C1;

[0070] n is the number of coal storage spaces included in the coal storage plan.

[0071] (2) The calculation rule of the coal quality similarity score C2 is:

[0072]

[0073] in:

[0074] C 2,max The highest score for item C2;

[0075] Q l 、M l 、A l 、V l 、S l 、T l They are the calorific value, moisture, ash, volatile matter, sulfur content and ash softening temperature of the incoming coal;

[0076] Q c 、M c 、A c 、V c 、S c 、T c They are the calorific value, moisture, ash, volatile matter, sulfur content and ash softening temperature of the coal at the boundary of the coal storage space;

[0077] Q Δ 、M Δ 、A Δ 、V Δ 、S Δ 、T Δ They are the interval quantities of calorific value, moisture, ash, volatile matter, sulfur content and ash softening temperature;

[0078] x Q 、x M 、x A 、x V 、xS 、x T The scoring weights are calorific value, moisture, ash, volatile matter, sulfur content, and ash softening temperature, which can be set by the coal yard manager according to the actual needs of the power plant, but must meet x Q +x M +x A +x V +x S +x T =1.

[0079] (3) The calculation rule for the score C3 of the principle of burning the old and keeping the new is:

[0080]

[0081] in:

[0082] C 3,max The highest score for item C3;

[0083] V F The volume of coal at the boundary of the coal storage space covered by the coal storage space;

[0084] V Z is the total volume of coal at the boundary of the coal storage space;

[0085] t F The number of days that the coal at the boundary of the coal storage space is stored;

[0086] t Z The maximum allowable storage days for coal at the boundary of the coal storage space.

[0087] (4) The calculation rule of the easy access to coal principle score C4 is:

[0088]

[0089] in:

[0090] C 4,max The highest score for item C4;

[0091] V x is the total volume of coal required to be fed into the furnace in the next m days at the boundary of the coal storage space.

[0092] When there are multiple types of boundary coal in the coal storage space, each type of boundary coal is calculated using the calculation rules of C2, C3, and C4, and then the weighted average is calculated based on the volume of each boundary coal covered by the coal storage space.

[0093] The weight of each principle (x1, x2, x3, x4) and the maximum score (C 1,max 、C 2,max 、C 3,max 、C 4,max) can be set by the coal yard manager according to the actual needs of the power plant.

[0094] In order to realize the decision-making method of multiple coal types storage in coal-fired power plants, a decision-making system for multiple coal types storage in coal-fired power plants is constructed. Figure 2 The system includes a coal pan shape processing module, a coal storage space calculation module, a coal storage plan construction module, a coal storage plan evaluation module, and a coal storage plan selection module. The coal pan shape processing module is used to obtain coal pan data from the digital coal yard system or coal pan meter system and format it into coal yard location-coal storage height data; the coal storage space calculation module is used to calculate the number of coal storage spaces, the volume of coal storage spaces, boundary coal quality information statistics, and the volume of boundary coal covered by coal storage spaces; the coal storage plan construction module is used to generate a set of preliminary coal storage plans; the coal storage plan evaluation module is used to calculate the total score of each plan in the set of preliminary coal storage plans according to the calculation rules of the total plan score C; the coal storage plan selection module selects the first i plans in descending order of C based on the number of optimization plans set by the user and outputs them to the user.

Claims

1. A method for making decisions on the storage of multiple types of coal in a coal-fired power plant, characterized in that: Including steps: (1) Input coal quality information and coal volume; (2) Obtain the three-dimensional shape, coal type and quality, and storage time of the coal stored in the coal yard from the digital coal yard system or the coal yard coal counting instrument system; (3) Analyze the coal storage shape data in the coal yard, determine the available coal storage space, number each coal storage space, calculate the available coal volume of the available coal storage space, and obtain the coal quality information of the coal storage space boundary from the digital coal yard system; (4) Find all coal storage space combinations whose coal storage volume is greater than the incoming coal volume from the existing storage space by combining them to form a preliminary coal storage plan set; (5) All the plans in the initial coal storage plan set are scored according to the principle of fewer piles, the principle of similar coal quality, the principle of burning old and retaining new, and the principle of easy access to coal, and are recorded as C1, C2, C3, and C4 in sequence. The total score C of each plan is calculated using the weighted sum method; (6) Output all coal storage plans or the first i coal storage plans in order of the total scores from high to low; The coal quality information includes: calorific value Q, moisture M, ash content A, volatile matter V, sulfur content S, and coal ash softening temperature T; The three-dimensional shape of the coal stored in the coal yard refers to the height of the coal stored at each plane position in the coal yard; The method for determining the available coal storage space is as follows: analyzing the highest boundary line of the coal yard, dividing the coal storage boundary into upslope, downslope, and flat bottom according to the rate of change of the highest boundary line of the coal yard with position, and defining any area between the coal yard boundary and upslope, between the coal yard boundary and downslope, between adjacent downslopes and upslopes, and above the flat bottom that does not reach the maximum coal storage height as a available coal storage space; For a strip coal yard, the highest boundary line of the coal yard refers to the coal level height data at the straight line position where the coal dropping point of the coal yard is located; For a circular coal yard, the highest boundary line of the coal yard refers to the coal level height data at the circular position where the coal drop point of the coal yard is located; the boundary coal of the coal storage space refers to the coal that has surface contact with the coal storage space; The method for calculating the coal storage volume of the coal storage space is as follows: based on the coal storage repose angle and the three-dimensional shape data of the coal stored in the coal yard, the coal storage height does not exceed the maximum coal storage height limit, and the coal does not overflow into other spaces, the volume numerical integration method is used for calculation; The calculation rule of the score C1 of the principle of less points is: C1=C 1,max -n; in: C 1,max The highest score for C1; n is the number of coal storage spaces included in the coal storage plan; The calculation rules for the coal quality similarity score C2 are as follows: in: C 2,max The highest score for item C2; Q l 、M l 、A l 、V l 、S l 、T l They are the calorific value, moisture, ash, volatile matter, sulfur content and ash softening temperature of the incoming coal; Q c 、M c 、A c 、V c 、S c 、T c They are the calorific value, moisture, ash, volatile matter, sulfur content and ash softening temperature of the coal at the boundary of the coal storage space; Q Δ 、M Δ 、A Δ 、V Δ 、S Δ 、T Δ They are the interval quantities of calorific value, moisture, ash, volatile matter, sulfur content and ash softening temperature; x Q 、x M 、x A 、x V 、x S 、x T They are the scoring weights of calorific value, moisture, ash, volatile matter, sulfur content and ash softening temperature respectively. Q +x M +x A +x V +x S +x T =1; The calculation rule of the burn-out-and-retain-new principle score C3 is: in: C 3,max The highest score for item C3; V F The volume of coal at the boundary of the coal storage space covered by the coal storage space; V Z is the total volume of coal at the boundary of the coal storage space; t F The number of days that the coal at the boundary of the coal storage space is stored; t Z The maximum allowable storage days of coal at the boundary of the coal storage space; The calculation rule of the easy access to coal principle score C4 is: in: C 4,max The highest score for item C4; V x is the total volume of coal required to be fed into the furnace in the next m days at the boundary of the coal storage space; When there are multiple types of boundary coal in the coal storage space, the calculation rules of C2, C3, and C4 are used to calculate each type of boundary coal, and then the weighted average is calculated based on the volume of each boundary coal covered by the coal storage space; The calculation rules for the total score C of each scheme are as follows: C=C1x1+C2x2+C3x3+C4x4 Among them: x1, x2, x3, x4 are the weights of C1, C2, C3, C4 respectively; The weight of each principle (x1, x2, x3, x4) and the highest score (C 1,max 、C 2,max 、C 3,max 、C 4,max ) can be set by the coal yard manager according to the actual needs of the power plant, but it must satisfy x1+x2+x3+x4=1.

2. A method for making decisions on storage of multiple types of coal in a coal-fired power plant according to claim 1, characterized in that: The multi-coal storage decision-making system for coal-fired power plants that implements this method consists of a coal plate shape processing module, a coal storage space calculation module, a coal storage plan construction module, a coal storage plan evaluation module, and a coal storage plan selection module. The coal pan shape processing module is used to obtain coal pan data from the digital coal yard system or the coal pan meter system and format it into coal yard location-coal storage height data; The coal storage space calculation module is used to calculate the number of coal storage spaces, the volume of coal storage spaces, boundary coal quality information, and the volume of boundary coal covered by the coal storage spaces; The coal storage plan building module is used to generate a preliminary coal storage plan set; The coal storage scheme evaluation module is used to calculate the total score of each scheme in the coal storage initial scheme set according to the calculation rule of the scheme total score C; The coal storage plan selection module selects the first i plans in descending order of C according to the user's setting of the number of optimal plans i required and outputs them to the user.

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