Fully-mechanized excavation face dust fall effect evaluation method

Abstract

The invention relates to a fully-mechanized excavation face dust fall effect evaluation method, and belongs to the technical field of coal mine operation. The method comprises the following steps: selecting a range 50m from the head of a fully-mechanized excavation face, and dividing the fully-mechanized excavation face into three areas according to a dust concentration rule: an area I with the dust concentration higher than 200mg / m < 3 >, and the length of the area I being l1; the dust concentration of the region II is 50-200mg / m < 3 >, and the length of the region II is 12; the dust concentration of the region III is lower than 50mg / m < 3 >, and the length of the region III is 13. The dust control effect of the fully-mechanized excavation face can be evaluated by establishing the evaluation relation between the dust control and removal effect and the regional distribution and the dust fall concentration. Therefore, monitoring and improvement of dust control measures of the fully-mechanized excavation face are facilitated, and cleanliness and safety of the working environment are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine operation and relates to a method for evaluating dust reduction effect of a comprehensive excavation face. Background Art

[0002] During coal mining, a large amount of dust is generated in the fully mechanized excavation face. Long-term inhalation of dust can cause serious harm to the miners' health, such as pneumoconiosis, respiratory diseases, etc. At the same time, high concentrations of dust can also reduce visibility, affect work safety, and even cause explosion accidents.

[0003] The traditional dust reduction effect evaluation method mainly relies on measuring the dust concentration at the driver's position or a fixed point on the working face. This method cannot fully reflect the overall dust reduction effect of the comprehensive excavation face, nor can it reflect the advantages of the long-pressure short-extraction air control dust removal technology. In addition, the traditional evaluation method cannot provide the distribution of dust concentration and the scope of the dust control area, which is not conducive to guiding dust control and optimizing the working face layout.

[0004] The long-pressure short-extraction air control and dust removal technology is one of the most effective dust prevention technical measures for comprehensive excavation working faces. It controls dust within a certain range of the working face through wind control devices such as wall-mounted wind ducts, and removes and purifies dust through dust collectors, thereby improving dust reduction efficiency. However, the dust reduction effect of the working face is affected by process parameters such as wind control by wall-mounted wind ducts and dust extraction by dust collectors, resulting in differences in dust concentration distribution and dust control area range. Therefore, a more scientific and objective evaluation method is needed to measure the dust reduction effect. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a method for evaluating the dust reduction effect of a comprehensive excavation face.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The dust reduction effect evaluation method of comprehensive excavation face is as follows:

[0008] The 50m range of the fully mechanized excavation face was selected and divided into three areas according to the dust concentration law:

[0009] Dust concentration is higher than 200mg / m 3 The length of zone I is l1;

[0010] Dust concentration is between 50 and 200 mg / m 3 Zone II, the length of Zone II is l2;

[0011] Dust concentration is less than 50mg / m 3 Zone III, the length of Zone III is l3;

[0012] Establish the evaluation relationship between dust control effect and regional distribution:

[0013] A l =0.5l1+0.3l2+0.2l3 (1)

[0014] In the formula, A l is the index of the dust control area, l1, l2, and l3 are the lengths of different concentration areas, in meters;

[0015] Establish the evaluation relationship between dust control effect and dust concentration:

[0016] A c =0.5c1+0.3c2+0.2c3 (2)

[0017] In the formula, A c is the dust concentration index, c1, c2, c3 are the dust concentrations in different areas, the unit is mg / m 3 ;

[0018] Establish the evaluation relationship between dust control effect, dust control area and dust concentration:

[0019]

[0020] Where A is the comprehensive index of dust control effect.

[0021] Furthermore, the three regions are divided based on the trend that dust concentration decreases with increasing distance.

[0022] Furthermore, the higher the value of the comprehensive index A of the dust control effect is, the better the dust reduction effect is.

[0023] The beneficial effects of the present invention are:

[0024] (1) The present invention can more objectively and comprehensively evaluate the dust reduction effect of the comprehensive excavation face by establishing an evaluation relationship between the dust control effect and the regional distribution and dust concentration, thus avoiding the limitation of the traditional method of judging with data from a single measuring point.

[0025] (2) By analyzing the dust concentration distribution in different areas, targeted dust control plans can be formulated, such as increasing spray dust reduction, improving ventilation systems, etc., thereby reducing dust concentration and protecting workers' health.

[0026] (3) According to the distribution of dust concentration, the working surface layout can be optimized and the area division can be adjusted to make the dust concentration distribution more uniform, reduce the area of ​​high-concentration areas, and improve the overall dust reduction effect.

[0027] (4) Through reasonable dust control measures and dust concentration management, the impact of dust on equipment and workers can be reduced, and work efficiency and production benefits can be improved.

[0028] (5) The present invention can be used as one of the important indicators for green mine construction, promoting mining enterprises to adopt more environmentally friendly and sustainable measures, reduce dust emissions, reduce the impact on the environment, and achieve sustainable development of mines.

[0029] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0031] Figure 1 This is a system diagram of the present invention. DETAILED DESCRIPTION

[0032] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0033] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0034] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] The invention is as follows: after adopting the long-pressure short-extraction controlled dust removal system composed of the wall-attached air duct and the dust collector, the backward diffusion of the head-on dust is effectively prevented, and the dust concentration shows a trend of decreasing with increasing distance.

[0036] The 50m range of the fully mechanized excavation face was selected and divided into three areas according to the dust concentration law: the dust concentration was higher than 200mg / m 3 Zone I, the length of zone I is l1; the dust concentration is between 50 and 200 mg / m 3 Zone II, the length of Zone II is l2; the dust concentration is less than 50mg / m 3 The length of zone III is l3, such as Figure 1 shown.

[0037] Establish the evaluation relationship between dust control effect and regional distribution:

[0038] A l =0.5l1+0.3l2+0.2l3 (1)

[0039] In the formula, A l is the index of the dust control area, l1, l2, l3 are the lengths of different concentration areas, respectively, in meters.

[0040] Establish the evaluation relationship between dust control effect and dust concentration:

[0041] A c =0.5c1+0.3c2+0.2c3 (2)

[0042] In the formula, A c is the dust concentration index, c1, c2, c3 are the dust concentrations in different areas, the unit is mg / m 3 .

[0043] Establish the evaluation relationship between dust control effect, dust control area and dust concentration:

[0044]

[0045] Result analysis:

[0046] The dust reduction effect of the comprehensive excavation face is evaluated based on the value of the comprehensive index A of dust control effect.

[0047] Analyze the dust concentration distribution in different areas, guide dust control and optimize the working surface layout.

[0048] Compare the effects of different dust control measures and dust reduction concentrations on work efficiency and optimize them.

[0049] Implementation Cases:

[0050] The dust reduction effect evaluation was carried out in a fully mechanized excavation face, and the collected data are as follows:

[0051] Zone I length l1 = 15m, dust concentration c1 = 245mg / m 3 ;

[0052] Zone II length l2 = 25m, dust concentration c2 = 120mg / m 3 ;

[0053] Zone III length l3 = 10m, dust concentration c3 = 46mg / m 3 .

[0054] Calculation steps:

[0055] Calculate the dust control area index: A l =l1+l2=15m+25m=40m

[0056] Calculate dust concentration index: A c =c1+c2+c3=245mg / m 3 +120mg / m 3 +46mg / m 3 =411mg / m 3

[0057] Calculate the comprehensive index of dust control effect: A = A l *A c =40m*411mg / m 3 =16340(m*mg / m 3 )

[0058] Result analysis:

[0059] The comprehensive index of dust control effect A is 16340 (m*mg / m 3 ), indicating that the dust reduction effect of this comprehensive excavation face is better.

[0060] The lengths of zones I and II are relatively long, indicating that the wind control and dust removal technology effectively controls the diffusion of dust.

[0061] The dust concentration in zone III is lower, indicating that the dust collector has a better purification effect.

[0062] Optimization suggestions:

[0063] The arrangement of the wall-attached air ducts can be further optimized to improve the wind control effect.

[0064] You can choose a more efficient dust collector to reduce the operating resistance of the dust collector and improve the dust removal efficiency.

[0065] Measures such as spray dust suppression can be added to reduce the amount of dust generated.

[0066] Here are two more examples of calculations:

[0067] Group 1:

[0068] Long pressure and short draw: l1, l2, l3 are: 15m, 25m and 10m respectively, c1, c2, c3 are: 245mg / m 3 , 120mg / m 3 and 46 mg / m 3 , the dust control effect A is calculated to be 3.38.

[0069] Group 2:

[0070] Long pressure and short draw: l1, l2, l3 are 8m, 11m and 31m respectively, c1, c2, c3 are 288mg / m 3 , 164mg / m 3 and 24 mg / m 3 , the dust control effect A is calculated to be 3.33.

[0071] Comparing the dust reduction effects of the two groups, the second group had better dust reduction effect.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A method for evaluating dust reduction effect of a fully mechanized excavation face, characterized in that: The method is: The 50m range of the fully mechanized excavation face was selected and divided into three areas according to the dust concentration law: Dust concentration is higher than 200mg / m 3 The length of zone I is l1; Dust concentration is between 50 and 200 mg / m 3 Zone II, the length of Zone II is l2; Dust concentration is less than 50mg / m 3 Zone III, the length of zone III is l3; Establish the evaluation relationship between dust control effect and regional distribution: A l ＝0.5l1+0.3l2+0.2l3 (1) In the formula, A l is the index of the dust control area, l1, l2, and l3 are the lengths of different concentration areas, in meters; Establish the evaluation relationship between dust control effect and dust concentration: A c =0.5c1+0.3c2+0.2c3 (2) In the formula, A c is the dust concentration index, c1, c2, c3 are the dust concentrations in different areas, the unit is mg / m 3 ; Establish the evaluation relationship between dust control effect, dust control area and dust concentration: Where A is the comprehensive index of dust control effect.

2. The method for evaluating dust reduction effect of a fully mechanized excavation face according to claim 1, characterized in that: The three regions are divided based on the trend that dust concentration decreases with increasing distance.

3. The method for evaluating dust reduction effect of a fully mechanized excavation face according to claim 1, characterized in that: The higher the value of the comprehensive index A of the dust control effect, the better the dust reduction effect.

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