Fully mechanized caving face production day plan planning method based on two-stage algorithm

Abstract

The invention discloses a fully mechanized caving face production day plan planning method based on a two-stage algorithm, and the method comprises the steps: respectively solving the coal blending proportions of mixed coal, injection coal, middling coal, coal slime and gangue in a coal blending stage through employing a non-homogeneous linear equation, and automatically giving an optimal coal blending scheme with the coal blending cost as a target. A data basis is provided for gross coal calculation in distribution and mining; in the distribution and mining stage, based on the ash balance from the ground to the underground, the influence of factors such as the length of the working face, the coal quality and the circulating footage on the amount of gangue falling on the working face is considered by reversely tracking the coal flow of the commercial coal from the ground to the underground raw coal; the method comprises the following steps of: establishing expressions of gross coal ash content, driving face ash content, stock gross coal ash content, working face ash content, working face falling gangue amount and the like, calculating to obtain gross coal planned yield and ash content of an underground working face, quickly and accurately compiling a daily production plan of a fully mechanized caving face, strengthening coal quality fine management of links such as underground coal laying and ground coal blending, and greatly improving the working efficiency of the fully mechanized caving face. And the coal mine gangue discharge amount is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of two-stage algorithms, and particularly to a method for planning the daily production plan of a fully-mechanized caving face using a two-stage algorithm. Background Technique

[0002] Previously, the daily production plan of the fully-mechanized caving face did not comprehensively consider factors such as the calorific value of blended coal above ground, commodity sales volume, coal blending, and single-knife production. Managers lacked calculation logic and tools, often consuming a large amount of time and energy, and were unable to quickly and accurately prepare the coal blending plan and the single-knife production plan for the fully-mechanized caving face. As a result, the preparation of the daily production plan for the fully-mechanized caving face was relatively rough and could not support the fine management of coal quality and the reduction of gangue emissions in the coal mine.

[0003] Currently, regarding the integrated optimization model and modeling method of production, transportation, and sales, it mainly focuses on the macro level of the coal mine group and is used to compile the production-transportation-sales plan at the group level to ensure the stable operation of production and sales at the group level. It does not involve the micro level of the planning of the coal mining face in the coal mine. It is necessary to conduct reverse tracking on the two-stage coal flow of coal blending above ground and coal mining below ground, and design an integrated production and sales model suitable for coal production units in the coal mine. Summary of the Invention

[0004] Aiming at the above-mentioned shortcomings of the existing technology, the purpose of the present invention is to provide a method for planning the daily production plan of a fully-mechanized caving face using a two-stage algorithm.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A method for planning the daily production plan of a fully-mechanized caving face using a two-stage algorithm, including the following steps:

[0006] Step 1: Ensure that the calorific value of the blended coal after coal blending is greater than the target value, and calculate the blending ratios of blended coal with pulverized coal injection, blended coal with medium coal, blended coal with slime, blended coal with gangue, blended coal with medium coal, and gangue respectively;

[0007] Step 2: According to the sales volume and price of blended coal, pulverized coal injection, medium coal, and slime, calculate different coal blending costs based on the blending ratio. Based on the principle of the lowest coal blending cost, and at the same time, according to the actual situation of the coal mine, find the optimal coal blending plan to optimize the product structure of the commercial coal in the coal mine, and at the same time provide a data basis for calculating the total amount of raw coal in coal mining;

[0008] Step 3: According to the screening and washing process of raw coal - blended coal - pulverized coal injection, based on the yields and sales volumes of blended coal and pulverized coal injection, calculate the total weight of raw coal underground, where the total weight of raw coal can be divided into raw coal from different working faces, heading coal gangue, and stockpiled raw coal;

[0009] Step 4: Calculate the raw coal ash content, the ash content of the tunneling face, the raw coal ash content in stock, and the ash content of the working face. Based on the ash balance between the surface and underground, establish an equation for the raw coal ash content, the ash content of the tunneling face, the raw coal ash content in stock, the ash content of the working face, and the amount of gangue dropped at the working face;

[0010] Step 5: Establish an equation for the calorific value of the coal quality at the working face, the length of the working face, the cyclic advance of the working face, and the amount of gangue dropped;

[0011] Step 6: Solve for the amount of gangue dropped at different working faces, determine the single-knife production of different working faces, and prepare the raw coal production plan for the underground working face.

[0012] Preferably, in Step 1,

[0013] (1) Ratio of blended coal to pulverized coal for injection: Incorporate pulverized coal for injection into the blended coal to optimize the calorific value of the blended coal. According to the calorific value balance, establish the equation:

[0014]

[0015] where a and b respectively represent the blending ratios of blended coal and pulverized coal for injection; Q 目 is the target calorific value of the blended coal, Q 混 is the calorific value of the blended coal, Q 喷 is the calorific value of the pulverized coal for injection; to ensure that the blending effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1;

[0016] (2) Ratio of blended coal to medium coal: Blend blended coal and medium coal to optimize the calorific value of the blended coal. According to the calorific value balance, establish the equation:

[0017]

[0018] where a and b respectively represent the blending ratios of blended coal and medium coal; Q 目 is the target calorific value of the blended coal, Q 混 is the calorific value of the blended coal, Q 中 is the calorific value of the medium coal; to ensure that the blending effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1;

[0019] (3) Ratio of blended coal to slime: Blend blended coal and slime to optimize the calorific value of the blended coal. According to the calorific value balance, establish the equation:

[0020]

[0021] where a and b respectively represent the blending ratios of blended coal and slime; Q 目 is the target calorific value of the blended coal, Q 混 is the calorific value of the blended coal, Q 泥is the calorific value of slime; to ensure that the blending coal effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1;

[0022] (4) Blending ratio of blended coal and gangue: Blend the blended coal and gangue, optimize the heat of the blended coal, and list the equation according to the calorific value balance:

[0023]

[0024] Among them, a and b respectively represent the blending ratios of the blended coal and gangue; Q 目 is the target calorific value of the blended coal, Q 混 is the calorific value of the blended coal, Q 矸 is the calorific value of the gangue; to ensure that the blending coal effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1;

[0025] (5) Blending ratio of blended coal with medium coal and gangue: Blend the blended coal with medium coal and gangue, optimize the heat of the blended coal, and to ensure that the equation has a unique solution, the proportion of medium coal is set to 0.2, and list the equation according to the calorific value balance:

[0026]

[0027] Among them, a, b, and c respectively represent the blending ratios of the blended coal with gangue and medium coal; Q 目 is the target calorific value of the blended coal, Q 混 is the calorific value of the blended coal, Q 矸 is the calorific value of the gangue, Q 中 is the calorific value of the medium coal; to ensure that the blending coal effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1.

[0028] Preferably, in step two,

[0029] (1) Blending cost of blended coal and injection coal: Based on the blending ratios and prices of the blended coal and injection coal, calculate the blending cost:

[0030] Y 混-喷 =α×Z 混 +b×Z 喷 Formula (1)

[0031] Among them, Y 混-喷 is the blending cost, yuan / ton; a and b are respectively the blending ratios of the blended coal and injection coal; Z 混 and Z 喷 are respectively the prices of the blended coal and injection coal, yuan / ton;

[0032] (2) Blending cost of blended coal and medium coal: Based on the blending ratios and prices of the blended coal and medium coal, calculate the blending cost:

[0033] Y 混-中 =α×Z混 + b × Z 中 Formula (2)

[0034] Where Y 混-中 is the blending coal cost, yuan / ton; a and b are the blending ratios of blended coal and medium coal respectively; Z 混 and Z 中 are the prices of blended coal and medium coal respectively, yuan / ton;

[0035] (3) Blending coal cost of blended coal and slime: Based on the blending ratios and prices of blended coal and slime, calculate the blending coal cost:

[0036] Y 混-泥 = α × Z 混 + b × Z 泥 Formula (3)

[0037] Where Y 混-泥 is the blending coal cost, yuan / ton; a and b are the blending ratios of blended coal and slime respectively; Z 混 and Z 泥 are the prices of blended coal and slime respectively, yuan / ton;

[0038] (4) Blending coal cost of blended coal and gangue: Based on the blending ratios and prices of blended coal and gangue, calculate the blending coal cost:

[0039] Y 混-矸 = α × Z 混 + b × Z 矸 Formula (4)

[0040] Where Y 混-矸 is the blending coal cost, yuan / ton; a and b are the blending ratios of blended coal and gangue respectively; Z 混 and Z 矸 are the prices of blended coal and gangue respectively, yuan / ton;

[0041] (5) Blending coal cost of blended coal, medium coal and gangue: Based on the blending ratios and prices of blended coal, gangue and medium coal, calculate the blending coal cost:

[0042] Y 混-中-泥 = α × Z 混 + b × Z 中 + c × Z 矸 Formula (5)

[0043] Where Y 混-中-泥 is the blending coal cost, yuan / ton; a, b, and c are the blending ratios of blended coal, medium coal and gangue respectively, and the medium coal ratio b is 0.2; Z 混 , Z 中 , Z 矸 are the prices of blended coal, medium coal and gangue respectively, yuan / ton;

[0044] (6) Sort different coal blending plans based on the principle of minimizing the coal blending cost, and find the optimal coal blending plan in combination with the actual situation of the coal mine to optimize the product structures of the blended coal and pulverized coal injection coal in the coal mine.

[0045] Preferably, in step three, after the raw coal underground is crushed and screened, the undersize materials are divided into the blended coal for storage and the blended coal for washing, and the oversize materials are large lumps of gangue; the products after the blended coal for washing is processed by heavy medium separation include pulverized coal injection coal. Therefore, according to the planned sales volume and yield of the pulverized coal injection coal and the blended coal, the total amount of raw coal at the underground working face is solved:

[0046]

[0047] Among them, T 毛 is the planned output of the raw coal and blended coal, in tons; T 混总 is the total planned output of the blended coal, in tons; T 混 is the total amount of the blended coal for storage, in tons; T 喷 is the total amount of the pulverized coal injection coal, in tons; Y 喷 is the yield of the pulverized coal injection coal, %; Y 混 is the yield of the blended coal, %.

[0048] Preferably, in step four, the total weight of the raw coal above ground can be divided into the theoretical coal amount at the working face, the amount of gangue dropped at the working face, the amount of coal and gangue at the heading face, and the amount of raw coal in stock;

[0049] (1) The formula for the ash content of the raw coal above ground is shown in formula (8):

[0050] T 灰 = T 混总 × A 混 + T 毛 × A 矸 Formula (8)

[0051] Among them, T 灰 is the ash content of the raw coal, in tons; A 混 is the ash content of the blended coal, %; A 矸 is the gangue content rate of the large lumps, %.

[0052] (2) The ash content of the theoretical coal amount at the working face and the formula for the theoretical coal amount are shown in formulas (9) - (12)

[0053] W 1煤 = L1 × H1 × D1 × A 1灰 × R1 Formula (9)

[0054] W 2煤 = L2 × H2 × D2 × A 2灰 × R2 Formula (10)

[0055] T 1煤 = L1 × H1 × D1 × R1 Formula (11)

[0056] T 2煤 = L2 × H2 × D2 × R2 Formula (12)

[0057] Where, W 1煤 、W 2煤 are the inner ash content of working face 1 and working face 2, in tons; T 1煤 、T 2煤 are the theoretical coal quantity of working face 1 and working face 2, in tons; L1, H1, D1, A 1灰 、R1 are the length, coal seam thickness, advancement, ash content and recovery rate of working face 1; L2, H2, D2, A 2灰 、R2 are the length, coal seam thickness, advancement, ash content and recovery rate of working face 2;

[0058] (3) The roadway driving types are divided into coal roadway, rock roadway and semi - coal - rock roadway. Calculate the coal - rock ash component of the driving face:

[0059] W 掘矸 = (F 巷 × C 巷 × I 煤 × E 煤 × A 煤 + F 巷 × C 巷 × I 岩 × E 岩 × A 岩 ) / 1000 Formula (13)

[0060] Where, W 掘杆 is the ash component of the driving face, in tons; F is the driving footage, in m; C is the roadway cross - sectional area, in m 2 ; I is the bulk density, in kg / m 3 ; A is the ash content, in %; E is the roadway type. When the roadway type is coal roadway, E 煤 is 1, E 岩 is 0. When the roadway type is rock roadway, E 岩 is 1, E 煤 is 0. For semi - coal - rock roadway, E 煤 is 0.5, E 岩 is 0.5;

[0061] (4) Coal mines are all equipped with buffer bins. When the raw coal output underground is less than the production capacity of the coal preparation plant, part of the raw coal in the buffer bin enters the washing process. Calculate the ash content of the stored raw coal:

[0062] W 库存 = T 毛煤 × A 毛 Formula (14)

[0063] Where, W 库存 is the ash component of the stored raw coal, in tons, T毛煤 Raw coal consumption for inventory, tons; A 毛 Ash content of raw coal, %;

[0064] (5) Based on the ash balance between the surface and underground, establish equations for calculating the ash content of raw coal, the ash content of the heading face, the ash content of raw coal in inventory, the ash content of the working face, and the amount of gangue dropped at the working face;

[0065] w 1矸 ++w 2矸

[0066] = 1 * T 灰 -W 1煤 *A 1煤灰 -W 2媒 *A 2煤灰 -W 掘矸 -W 库存 Formula (15)

[0067] Wherein, W 1矸 , W 2矸 is the amount of gangue dropped at the working face, tons.

[0068] Preferably, in step five, the output of the working face can be divided into theoretical coal amount and gangue amount. The better the coal quality and calorific value of the working face, the more gangue is dropped in the fully-mechanized caving face; the worse the coal quality of the working face, the less gangue is dropped in the fully-mechanized caving face; the longer the working face length, the more gangue is dropped in the fully-mechanized caving face; the shorter the working face length, the less gangue is dropped in the fully-mechanized caving face; the larger the number of cutting cycles at the working face, the more gangue is dropped in the fully-mechanized caving face; the smaller the number of cutting cycles at the working face, the less gangue is dropped in the fully-mechanized caving face;

[0069]

[0070] Q1, Q2 are the coal quality calorific values of the working face, kcal / kg; L1, L2 are the lengths of the working face, m; D1, D2 are the number of cutting cycles at the working face.

[0071] Preferably, in step six, solve for the amount of gangue dropped at different working faces, calculate the planned output and the output per single cut of the working face, and compile the raw coal production plan table for different underground working faces;

[0072] T 1计划 = T 1煤 +W 1矸 Formula (17)

[0073] T 2计划 = T 2煤 +W 2矸 Formula (18)

[0074] T 总 = T 1计划 +W2计划 Formula (19)

[0075]

[0076] Wherein, T 1计划 , T 2计划 are respectively the planned output of the working face, in tons; T 总 is the total planned output of the mine, in tons; T 1刀 , T 2刀 is the output per single cut of the working face, in tons; D1 and D2 are respectively the number of cuts in the working face cycle.

[0077] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0078] In the coal blending stage of the present invention, non-homogeneous linear equations are used to respectively solve the coal blending ratios of blended coal with pulverized coal injection, medium coal, slime and gangue. According to the level of coal blending cost, the best coal blending plan is given. The coal mine sales department selects a reasonable coal blending plan according to the actual situation on site, providing a basis for calculating the raw coal quantity in coal mining;

[0079] In the coal mining stage, based on the ash balance between the surface and the underground, by backtracking the coal flow of surface commercial coal - underground raw coal, an equation of the raw coal ash content with the ash content of the heading face, the ash content of the raw coal in stock, the ash content of the working face, and the amount of gangue dropped at the working face is established, and the planned output and ash content of the raw coal of the underground working face are calculated, supporting the rapid and accurate preparation of the daily production plan of the fully mechanized caving face. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] Figure 1 is a flowchart of the method for planning the daily production plan of the fully mechanized caving face with the two-stage algorithm of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0081] Please refer to Figure 1 , the present invention provides a technical solution: a method for planning the daily production plan of the fully mechanized caving face with a two-stage algorithm, including the following steps:

[0082] Step 1: Ensure that the heat of the blended coal after coal blending is greater than the target value by the coal blending coefficient, and calculate the coal blending ratios of blended coal with pulverized coal injection, blended coal with medium coal, blended coal with slime, blended coal with gangue, blended coal with medium coal, and gangue respectively;

[0083] Step 2: Based on the sales volume and price of blended coal, pulverized coal injection, medium coal and slime, calculate different coal blending costs based on the coal blending ratio. According to the principle of the lowest coal blending cost, and at the same time, find the optimal coal blending plan according to the actual situation of the coal mine, optimize the product structure of the coal mine's commercial coal, and provide data basis for calculating the total amount of raw coal in coal mining;

[0084] Step 3: Based on the screening and washing processes of raw coal - blended coal - pulverized coal injection coal, calculate the total weight of underground raw coal according to the yields and sales volumes of blended coal and pulverized coal injection coal. The total weight of raw coal can be divided into raw coal from different working faces, heading coal gangue, and stockpiled raw coal.

[0085] Step 4: Calculate the ash content of raw coal, the ash content of the heading face, the ash content of stockpiled raw coal, and the ash content of the working face. Based on the ash balance between the surface and underground, establish equations for the ash content of raw coal, the ash content of the heading face, the ash content of stockpiled raw coal, the ash content of the working face, and the amount of gangue dropped at the working face.

[0086] Step 6: Establish equations for the calorific value of coal quality at the working face, the length of the working face, the cyclic advance of the working face, and the amount of gangue dropped.

[0087] Step 6: Solve for the amount of gangue dropped at different working faces, determine the single - cut production of different working faces, and prepare the production plan for underground raw coal at the working face.

[0088] In Step 1,

[0089] (1) Ratio of blended coal to pulverized coal injection coal: Incorporate pulverized coal injection coal into blended coal to optimize the calorific value of blended coal. According to the calorific value balance, establish the equation:

[0090]

[0091] where a and b represent the blending ratios of blended coal and pulverized coal injection coal respectively; Q 目 is the target calorific value of blended coal, Q 混 is the calorific value of blended coal, Q 喷 is the calorific value of pulverized coal injection coal; to ensure that the blending effect is slightly greater than the specified calorific value of blended coal, l is the blending coefficient, and its value is set between 1 and 1.1.

[0092] (2) Ratio of blended coal to middlings: Blend blended coal and middlings to optimize the calorific value of blended coal. According to the calorific value balance, establish the equation:

[0093]

[0094] where a and b represent the blending ratios of blended coal and middlings respectively; Q 目 is the target calorific value of blended coal, Q 混 is the calorific value of blended coal, Q 中 is the calorific value of middlings; to ensure that the blending effect is slightly greater than the specified calorific value of blended coal, l is the blending coefficient, and its value is set between 1 and 1.1.

[0095] (3) Ratio of blended coal to slime: Blend blended coal and slime to optimize the calorific value of blended coal. According to the calorific value balance, establish the equation:

[0096]

[0097] Among them, a and b respectively represent the blending ratios of blended coal and slime; Q 目 is the target calorific value of the blended coal, and Q 混 is the calorific value of the blended coal, and Q 泥 is the calorific value of the slime; to ensure that the blending effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1;

[0098] (4) Blending ratio of blended coal and gangue: Blend the blended coal and gangue to optimize the calorific value of the blended coal, and list the equation according to the calorific value balance:

[0099]

[0100] Among them, a and b respectively represent the blending ratios of blended coal and gangue; Q 目 is the target calorific value of the blended coal, and Q 混 is the calorific value of the blended coal, and Q 矸 is the calorific value of the gangue; to ensure that the blending effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1;

[0101] (5) Blending ratio of blended coal with medium coal and gangue: Blend the blended coal with medium coal and gangue to optimize the calorific value of the blended coal. To ensure that the equation has a unique solution, the proportion of medium coal is set to 0.2, and list the equation according to the calorific value balance:

[0102]

[0103] Among them, a, b, and c respectively represent the blending ratios of blended coal with gangue and medium coal; Q 目 is the target calorific value of the blended coal, and Q 混 is the calorific value of the blended coal, and Q 矸 is the calorific value of the gangue, and Q 中 is the calorific value of the medium coal; to ensure that the blending effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1;

[0104] In step two,

[0105] (1) Blending cost of blended coal and pulverized coal injection: Based on the blending ratios and prices of blended coal and pulverized coal injection, calculate the blending cost:

[0106] Y 混-喷 =α×Z 混 +b×Z 喷 Formula (1)

[0107] Among them, Y 混-喷 is the blending cost, yuan / ton; a and b are respectively the blending ratios of blended coal and pulverized coal injection; Z 混 and Z 喷 are respectively the prices of blended coal and pulverized coal injection, yuan / ton;

[0108] (2) Blending cost of blended coal and medium coal: Based on the blending ratios and prices of blended coal and medium coal, calculate the blending cost:

[0109] Y 混-中 = α × Z 混 + b × Z 中 Formula (2)

[0110] Where, Y 混-中 is the blending cost, yuan / ton; a and b are the blending ratios of blended coal and medium coal respectively; Z 混 and Z 中 are the prices of blended coal and medium coal respectively, yuan / ton;

[0111] (3) Blending cost of blended coal and slime: Based on the blending ratios and prices of blended coal and slime, calculate the blending cost:

[0112] Y 混-泥 = α × Z 混 + b × Z 泥 Formula (3)

[0113] Where, Y 混-泥 is the blending cost, yuan / ton; a and b are the blending ratios of blended coal and slime respectively; Z 混 and Z 泥 are the prices of blended coal and slime respectively, yuan / ton;

[0114] (4) Blending cost of blended coal and gangue: Based on the blending ratios and prices of blended coal and gangue, calculate the blending cost:

[0115] Y 混-矸 = α × Z 混 + b × Z 矸 Formula (4)

[0116] Where, Y 混-矸 is the blending cost, yuan / ton; a and b are the blending ratios of blended coal and gangue respectively; Z 混 and Z 矸 are the prices of blended coal and gangue respectively, yuan / ton;

[0117] (5) Blending cost of blended coal, medium coal and gangue: Based on the blending ratios and prices of blended coal, gangue and medium coal, calculate the blending cost:

[0118] Y 混-中-泥 = α × Z 混 + b × Z 中 + c × Z 矸 Formula (5)

[0119] Where, Y 混-中-泥 is the blending cost, yuan / ton; a, b, and c are the blending ratios of blended coal, medium coal and gangue respectively, and the medium coal ratio b is 0.2; Z 混, Z 中 , Z 矸 are the prices of blended coal, medium coal, and gangue, respectively, in yuan per ton;

[0120] (6) Sort different coal blending schemes based on the principle of minimizing the blending cost, and combine the actual situation of the coal mine to find the optimal coal blending scheme to optimize the product structures of the blended coal and pulverized coal injection coal in the coal mine;

[0121] In Step 3, after the raw coal underground is crushed and screened, the undersize materials are divided into the blended coal for binning and the blended coal for washing, and the oversize materials are large lumps of gangue; the products of the blended coal for washing after heavy medium washing include pulverized coal injection coal. Therefore, according to the planned sales volume and yield of pulverized coal injection coal and blended coal, the total amount of raw coal at the underground working face is solved:

[0122]

[0123] where, T 毛 is the planned output of raw blended coal, in tons; T 混总 is the total planned output of blended coal, in tons; T 混 is the total amount of blended coal for binning, in tons; T 喷 is the total amount of pulverized coal injection coal, in tons; Y 喷 is the yield of pulverized coal injection coal, in %; Y 混 is the yield of blended coal, in %;

[0124] In Step 4, the total weight of the raw coal above ground can be divided into the theoretical coal amount at the working face, the amount of gangue dropped at the working face, the coal and gangue amount at the heading face, and the inventory of raw coal;

[0125] (1) The formula for the ash content of the raw coal above ground is as shown in Formula 8:

[0126] T 灰 = T 混总 × A 混 + T 毛 × A 矸 Formula (8)

[0127] where, T 灰 is the ash content component of the raw coal, in tons; A 混 is the ash content of the blended coal, in %; A 矸 is the large lump gangue content rate, in %;

[0128] (2) The ash content and the theoretical coal amount of the theoretical coal amount at the working face are calculated as shown in Formulas 9 - 12

[0129] W 1煤 = L1 × H1 × D1 × A 1灰 × R1 Formula (9)

[0130] W 2煤 = L2 × H2 × D2 × A 2灰 × R2 Formula (10)

[0131] T 1煤 = L1×H1×D1×R1 Formula (11)

[0132] T 2煤 = L2×H2×D2×R2 Formula (12)

[0133] Where, W 1煤 and W 2煤 are the internal ash amounts of working face 1 and working face 2, in tons; T 1煤 and T 2煤 are the theoretical coal amounts of working face 1 and working face 2, in tons; L1, H1, D1, A 1灰 and R1 are the length, coal seam thickness, advance rate, ash content and recovery rate of working face 1 respectively; L2, H2, D2, A 2灰 and R2 are the length, coal seam thickness, advance rate, ash content and recovery rate of working face 2 respectively;

[0134] (3) The roadway driving types are divided into coal roadways, rock roadways and semi - coal - rock roadways. Calculate the coal - rock ash component of the driving face:

[0135] W 掘矸 = (F 巷 × C 巷 × I 煤 × E 煤 × A 煤 + F 巷 × C 巷 × I 岩 × E 岩 × A 岩 ) / 1000 Formula (13)

[0136] Where, W 掘杆 is the ash component of the driving face, in tons; F is the driving footage, in m; C is the roadway cross - sectional area, in m 2 ; I is the unit weight, in kg / m 3 ; A is the ash content, in %; E is the roadway type. When the roadway type is a coal roadway, E 煤 is 1, E 岩 is 0. When the roadway type is a rock roadway, E 岩 is 1, E 煤 is 0. For a semi - coal - rock roadway, E 煤 is 0.5, E 岩 is 0.5;

[0137] (4) Coal mines are all equipped with buffer bins. When the raw coal output underground is less than the production capacity of the coal preparation plant, part of the raw coal in the buffer bin enters the washing process. Calculate the ash content of the stored raw coal:

[0138] W 库存 = T 毛煤 × A 毛Formula (14)

[0139] Wherein, W 库存 is the gross coal ash content in stock, in tons, and T 毛煤 is the amount of raw coal used in stock, in tons; A 毛 is the ash content of raw coal, %;

[0140] (5) Based on the ash balance between the surface and underground, establish equations for calculating the gross coal ash content, the ash content in the heading face, the gross coal ash content in stock, the ash content in the working face, and the amount of gangue dropped in the working face;

[0141] W 1矸 ++W 2矸 = 1 * T 灰 -W 1煤 * A 1煤灰 -W 2煤 * A 2煤灰 -W 掘矸 -W 库存 Formula (15)

[0142] Wherein, W 1矸 , W 2矸 is the amount of gangue dropped in the working face, in tons;

[0143] In step five, the output of the working face can be divided into theoretical coal volume and gangue volume. The better the coal quality and calorific value of the working face, the more gangue is dropped in the fully-mechanized caving face; the worse the coal quality of the working face, the less gangue is dropped in the fully-mechanized caving face; the longer the working face length, the more gangue is dropped in the fully-mechanized caving face; the shorter the working face length, the less gangue is dropped in the fully-mechanized caving face; the larger the number of cutting cycles in the working face, the more gangue is dropped in the fully-mechanized caving face; the smaller the number of cutting cycles in the working face, the less gangue is dropped in the fully-mechanized caving face;

[0144]

[0145] Q1 and Q2 are the coal quality calorific values of the working face, in kcal / kg; L1 and L2 are the lengths of the working face, in m; D1 and D2 are the number of cutting cycles in the working face;

[0146] In step six, solve to obtain the amount of gangue dropped in different working faces, calculate the planned output and output per cutting cycle of the working face, and prepare the production plan of raw coal for different working faces underground;

[0147] T 1计划 = T 1煤 + W 1矸 Formula (17)

[0148] T 2计划 = T 2煤 + W 2矸 Formula (18)

[0149] T总 = T 1计划 + W 2计划 Formula (19)

[0150]

[0151] Wherein, T 1计划 , T 2计划 are respectively the planned output of the working face, in tons; T 总 is the total planned output of the mine, in tons; T 1刀 , T 2刀 is the output per single cut of the working face, in tons; D1 and D2 are respectively the number of cuts in the working face cycle;

[0152] In the coal blending stage, a non - homogeneous linear equation is used to solve the coal blending ratio, and the optimal coal blending plan is given according to the coal blending cost. Compared with advanced algorithms such as linear programming and evolutionary algorithms, this method is simple and easy to use, and the coal mine can flexibly select the coal blending plan according to the actual situation on site; according to the two - stage reverse tracking of surface coal blending - underground coal mining, a daily production plan for the fully - mechanized caving face based on the two - stage of coal blending - coal mining is constructed, and the daily production plan for the fully - mechanized caving face is compiled quickly and accurately, greatly reducing the difficulty of compiling the daily production plan for the fully - mechanized caving face, strengthening the fine management of coal quality in links such as underground coal caving and coal blending, effectively reducing the discharge of coal gangue in the coal mine, and improving the economic benefits of low - value products.

Claims

1. A planning method for the daily production plan of the fully-mechanized caving face with a two-stage algorithm, characterized in that, It includes the following steps: Step 1: Ensure that the heat of the blended coal after blending is greater than the target value by the blending coefficient, and calculate the blending ratios of the blended coal with the injection coal, the blended coal with the medium coal, the blended coal with the slime, the blended coal with the gangue, the blended coal with the medium coal, and the gangue respectively; Step 2: Based on the sales volumes and prices of the blended coal, injection coal, medium coal, and slime, calculate the different blending costs according to the blending ratios. Taking the principle of the lowest blending cost, and at the same time, find the optimal blending plan according to the actual situation of the coal mine, optimize the product structure of the commercial coal in the coal mine, and provide data basis for calculating the total amount of raw coal in the combined mining; Step 3: According to the screening and washing processes of the raw coal - blended coal - injection coal, calculate the total weight of the underground raw coal based on the yields and sales volumes of the blended coal and injection coal. The total weight of the raw coal can be divided into the raw coal of different working faces, the heading coal gangue, and the stockpiled raw coal; Step 4: Calculate the ash content of the raw coal, the ash content of the heading working face, the ash content of the stockpiled raw coal, and the ash content of the working face. Based on the ash balance between the surface and underground, establish equations for calculating the ash content of the raw coal and the ash content of the heading working face, the ash content of the stockpiled raw coal, the ash content of the working face, and the amount of gangue dropped at the working face; Step 5: Establish equations for the coal quality heat, the working face length, the cyclic advance of the working face, and the amount of gangue dropped; Step 6: Solve the dropping amounts of different working faces, determine the single - cut production of different working faces, and prepare the production plan of the underground working face raw coal.

2. The daily production plan planning method for the fully-mechanized caving face of a two-stage algorithm according to claim 1, wherein: In the above step 1, (1) Blending ratio of the blended coal with the injection coal: Incorporate the injection coal into the blended coal to optimize the heat of the blended coal, and list the equation according to the calorific value balance: Among them, a and b respectively represent the blending ratios of blended coal and injection coal; Q 目 is the target calorific value of the blended coal, and Q 混 is the calorific value of the blended coal, and Q 喷 is the calorific value of the injection coal; to ensure that the blending effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1; (2) Blending ratio of the blended coal with the medium coal: Blend the blended coal with the medium coal to optimize the heat of the blended coal, and list the equation according to the calorific value balance: Among them, a and b respectively represent the blending ratios of blended coal and medium coal; Q 目 is the target calorific value of the blended coal, and Q 混 is the calorific value of the blended coal, and Q 中 is the calorific value of the medium coal; to ensure that the blending effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1; (3) Blending ratio of the blended coal with the slime: Blend the blended coal with the slime to optimize the heat of the blended coal, and list the equation according to the calorific value balance: Among them, a and b respectively represent the blending ratios of blended coal and slime; Q 目 is the target calorific value of the blended coal, and Q 混 is the calorific value of the blended coal, and Q 泥 is the calorific value of the slime; to ensure that the blending effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1; (4) Blending ratio of the blended coal with the gangue: Blend the blended coal with the gangue to optimize the heat of the blended coal, and list the equation according to the calorific value balance: Among them, a and b respectively represent the blending ratios of blended coal and gangue; Q 目 is the target calorific value of the blended coal, Q 混 is the calorific value of the blended coal, Q 矸 is the calorific value of the gangue; to ensure that the blending effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.1; (5) Blending ratio of the blended coal with the medium coal and gangue: Blend the blended coal with the medium coal and gangue to optimize the heat of the blended coal. To ensure a unique solution to the equation, set the proportion of the medium coal to 0.2, and list the equation according to the calorific value balance: Among them, a, b, and c respectively represent the blending ratios of blended coal with gangue and medium coal; Q 目 is the target calorific value of the blended coal, Q 混 is the calorific value of the blended coal, Q 矸 is the calorific value of the gangue, Q 中 is the calorific value of the medium coal; to ensure that the blending effect is slightly greater than the specified calorific value of the blended coal, l is the blending coefficient, and its value is set between 1 and 1.

1.

3. The production daily plan planning method for fully-mechanized caving face with two-stage algorithm according to claim 1, characterized in that: In the above step 2, (1) Blending cost of the blended coal with the injection coal: Calculate the blending cost based on the blending ratio and price of the blended coal and injection coal: Y 混-喷 = a × Z 混 + b × Z 啧 Formula (1) Among them, Y 混-喷 is the blending coal cost, yuan / ton; a and b are the blending ratios of blended coal and pulverized coal injection coal respectively; Z 混 and Z 喷 are the prices of blended coal and pulverized coal injection coal respectively, yuan / ton; (2) Blending cost of the blended coal with the medium coal: Calculate the blending cost based on the blending ratio and price of the blended coal and medium coal: Y 混-中 = a × Z 混 + b × Z 中 Formula (2) Among them, Y 混-中 is the blending coal cost, yuan / ton; a and b are the blending ratios of blended coal and medium coal respectively; Z 混 and Z 中 are the prices of blended coal and medium coal respectively, yuan / ton; (3) Blending cost of the blended coal with the slime: Calculate the blending cost based on the blending ratio and price of the blended coal and slime: Y 混-泥 = a × Z 混 + b × Z 泥 Formula (3) Among them, Y 混-泥 is the blending coal cost, yuan / ton; a and b are the blending ratios of blended coal and slime respectively; Z 混 and Z 泥 are the prices of blended coal and slime respectively, yuan / ton; (4) Blending cost of the blended coal with the gangue: Calculate the blending cost based on the blending ratio and price of the blended coal and gangue: Y 混-矸 = a × Z 混 + b × Z 矸 Formula (4) Among them, Y 混-矸 is the blending coal cost, yuan / ton; a and b are the blending ratios of blended coal and gangue respectively; Z 混 and Z 矸 are the prices of blended coal and gangue respectively, yuan / ton; (5) Blending cost of the blended coal with the medium coal and gangue: Calculate the blending cost based on the blending ratio and price of the blended coal, gangue, and medium coal: Y 混-中-泥 = α × Z 混 + b × Z 中 + c × Z 矸 Equation (5) Among them, Y 混-中-泥 is the blending coal cost, yuan / ton; a, b, and c are the blending ratios of blended coal, medium coal, and gangue respectively, and the medium coal ratio b is 0.2; Z 混 and Z 中 and Z 矸 are the prices of blended coal, medium coal, and gangue respectively, yuan / ton; (6) Taking the minimum blending cost as the principle, sort different blending plans, and find the optimal blending plan in combination with the actual situation of the coal mine to optimize the product structures of the blended coal and injection coal in the coal mine.

4. A comprehensive production daily plan planning method for fully-mechanized caving face using a two-stage algorithm according to claim 1, characterized in that: In Step 3, after the raw coal underground is crushed and screened, the undersize materials are divided into the coal blend for bin entry and the coal blend for washing, and the oversize materials are large lumps of gangue. The products after the heavy medium washing of the coal blend for washing include pulverized coal for injection. Therefore, based on the planned sales volume and yield of the pulverized coal for injection and the coal blend, the total amount of raw coal at the underground working face is solved: Among them, T 毛 is the planned output of blended coal, in tons; T 混总 is the total planned output of blended coal, in tons; T 混 is the total amount of blended coal entering the warehouse, in tons; T 喷 is the total amount of injection coal, in tons; Y 喷 is the yield of injection coal, %; Y 混 is the yield of blended coal, %.

5. A method for planning the daily production plan of the fully-mechanized caving face with a two-stage algorithm according to claim 1, characterized in that: In Step 4, the total weight of the raw coal above ground can be divided into the theoretical coal amount at the working face, the amount of gangue caved at the working face, the coal and gangue amount at the heading face, and the amount of raw coal in stock. (1) The ash content formula of the raw coal above ground is as shown in Formula 8: T 灰 = T 混总 × A 混 + T 毛 × A 矸 Formula (8) Among them, T 灰 is the weight of raw coal ash, in tons; A 混 is the ash content of blended coal, in %; A 矸 is the gangue content in large lumps, in %; (2) The ash content and the theoretical coal amount formula of the theoretical coal amount at the working face are as shown in Formulas 9 - 12 W 1煤 = L1 × H1 × D1 × A 1灰 × R1 Equation (9) W 2煤 = L2 × H2 × D2 × A 2灰 × R2 Formula (10) T 1煤 = L1 × H1 × D1 × R1 Equation (11) T 2煤 = L2 × H2 × D2 × R2 Equation (12) Among them, W 1煤 and W 2煤 are the internal ash amounts of working face 1 and working face 2 respectively, in tons; T 1煤 and T 2煤 are the theoretical coal amounts of working face 1 and working face 2 respectively, in tons; L1, H1, D1, A 1灰 and R1 are the length, coal seam thickness, advancement, ash content and recovery rate of working face 1 respectively; L2, H2, D2, A 2灰 and R2 are the length, coal seam thickness, advancement, ash content and recovery rate of working face 2 respectively; (3) The types of roadway headings are divided into coal roadway, rock roadway, and semi - coal - rock roadway. Calculate the coal and rock ash content at the heading face: W 掘矸 =(F 巷 ×C 巷 ×I 煤 ×E 煤 ×A 煤 +F 巷 ×C 巷 ×I 岩 ×E 岩 ,×A 岩 ) / 1000 Formula (13) Among them, W 掘杆 is the ash content of the driving face, in tons; F is the driving footage, in m; C is the cross-sectional area of the roadway, in m 2 ; I is the unit weight, in kg / m 3 ; A is the ash content, in %; E is the roadway type. When the roadway type is a coal roadway, E 煤 is 1, E 岩 is 0. When the roadway type is a rock roadway, E 岩 is 1, E 煤 is 0. For a semi-coal rock roadway, E 煤 is 0.5, E 岩 is 0.5; (4) Buffer bins are set in all coal mines. When the output of raw coal underground is less than the production capacity of the coal washing plant, part of the raw coal in the buffer bin enters the washing process. Calculate the ash content of the raw coal in stock: W 库存 = T 毛煤 × A 毛 Formula (14) Among them, W 库存 is the ash content of raw coal in stock, in tons, T 毛煤 is the amount of raw coal used in stock, in tons; A 毛 is the ash content of raw coal, %; (5) Based on the ash balance between above - ground and underground, establish an equation for the ash content of the raw coal, the ash content at the heading face, the ash content of the raw coal in stock, the ash content at the working face, and the amount of gangue caved at the working face; W 1矸 ++W 2矸 = 1*T 灰 -W 1煤 *A 1煤灰 -W 2煤 *A 2煤灰 -W 掘矸 -W 库存 Formula (15) Among them, W 1矸 , W 2矸 is the amount of gangue dropped at the working face, in tons.

6. The daily production plan planning method for the fully-mechanized caving face of a two-stage algorithm according to claim 1, wherein: In Step 5, the output of the working face can be divided into the theoretical coal amount and the amount of gangue. The better the coal quality heat of the working face, the more gangue is caved in the fully - mechanized caving face; the worse the coal quality of the working face, the less gangue is caved in the fully - mechanized caving face. The longer the working face length, the more gangue is caved in the fully - mechanized caving face; the shorter the working face length, the less gangue is caved in the fully - mechanized caving face. The larger the number of cutting passes in the working face cycle, the more gangue is caved in the fully - mechanized caving face; the smaller the number of cutting passes in the working face cycle, the less gangue is caved in the fully - mechanized caving face. Q1 and Q2 are the coal quality heat of the working face, kcal / kg; L1 and L2 are the lengths of the working face, m; D1 and D2 are the number of cutting passes in the working face cycle.

7. A comprehensive production daily plan planning method for fully-mechanized caving face using a two-stage algorithm according to claim 1, characterized in that: In Step 6, the amount of gangue caved at different working faces is solved, the planned output and the output per cutting pass of the working face are calculated, and a production plan table of the raw coal at different underground working faces is compiled. T 1计划 = T 1煤 + W 1矸 Formula (17) T 2计划 = T 2煤 + W 2矸 Equation (18) T 总 = T 1计划 + W 2计划 Equation (19) Among them, T 1计划 , T 2计划 are the planned output of the working face, in tons; T 总 is the total planned output of the mine, in tons; T 1刀 , T 2刀 is the output per single cut of the working face, in tons; D1 and D2 are the number of cuts in the working face cycle respectively.

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