CN111878077B - Cutting dust falling and reducing method for coal roadway fully-mechanized excavation working face - Google Patents
Cutting dust falling and reducing method for coal roadway fully-mechanized excavation working face Download PDFInfo
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- 239000000428 dust Substances 0.000 title claims abstract description 186
- 239000003245 coal Substances 0.000 title claims abstract description 92
- 238000005520 cutting process Methods 0.000 title claims abstract description 81
- 238000009412 basement excavation Methods 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 43
- 230000009467 reduction Effects 0.000 claims abstract description 8
- 230000005641 tunneling Effects 0.000 claims description 13
- 230000000241 respiratory effect Effects 0.000 claims description 12
- 230000036346 tooth eruption Effects 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 4
- 230000018109 developmental process Effects 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000001629 suppression Effects 0.000 description 14
- 239000006260 foam Substances 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000004088 foaming agent Substances 0.000 description 6
- 239000004604 Blowing Agent Substances 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 208000028571 Occupational disease Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000010832 independent-sample T-test Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000001422 normality test Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 206010035653 pneumoconiosis Diseases 0.000 description 1
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- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/22—Equipment for preventing the formation of, or for removal of, dust
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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Abstract
The invention discloses a cutting dust fall and dust reduction method for a coal roadway fully-mechanized excavation working face, which comprises the steps of selecting a fully-mechanized excavation working face adopting the same dust fall technology as a control group before dust fall of a target fully-mechanized excavation working face, measuring the fixed carbon content and the brittleness value of coal, recording the dust fall medium usage corresponding to the maximum dust fall rate as the optimal dust fall medium usage, comparing the fixed carbon content and the brittleness value of the target working face coal with the control group, adjusting the dust fall medium usage of the target working face on the basis of the optimal dust fall medium usage, replacing a cutting tooth used by a heading machine with a cutting tooth with a smaller tooth tip conical angle, and cutting by adopting a smaller rotating speed if the rotating speed of the heading machine is adjustable. The invention can fundamentally reduce the generation of dust, provides scientific guidance for the amount of the dust-settling medium in advance, ensures the dust-settling effect, improves the economy of dust control, is favorable for the popularization and the application of the dust-settling technology, breaks through the current 'extensive dust-settling' old pattern and realizes a new 'precise dust-settling' method.
Description
Technical Field
The invention relates to a dust-settling and dust-reducing method for a driving face, in particular to a cutting dust-settling and dust-reducing method for a fully mechanized driving face of a coal roadway.
Background
The mechanization degree of a coal mine tunneling working face is increased year by year, and the dust yield is also increased sharply. The pneumoconiosis caused by long-term dust inhalation is the first major occupational disease in China, most of which are coal mine workers, and cause serious harm to physical and psychological health of the workers.
The dust fall technology applied to the fully mechanized excavation working face generally comprises dust fall spraying, dust suppression foam, a dust removal fan and the like, but researchers and field operators pay more attention to the optimization of self parameters of dust fall technical equipment, such as a nozzle structure of the dust fall spraying, water quantity, water pressure, foaming agent quantity and foam quantity of the dust suppression foam, air suction quantity of the dust removal fan and the like, and the difference of dust production characteristics among different working faces is rarely considered. In the actual production process, the concentration of different tunneling flour dust may differ by several times. Because the difference of dust production is not considered, the adopted technical parameters are often the same or similar, the formulation and implementation of dust prevention measures lack scientific basis, and the mismatching of dust fall capacity and dust production capacity is easily caused, namely the dust production concentration of a working face is high, but the dust fall capacity is insufficient (the dust fall medium is less), the final residual dust concentration is still high, and the dust fall effect is greatly reduced; or the dust concentration is low, and too many dust fall measures or media are adopted, so that the technical and economic matching is unreasonable, and the dust treatment efficiency is low. Therefore, if the dust is to be treated efficiently and economically, the difference of the cutting dust production of the heading machines with different working faces needs to be considered.
Disclosure of Invention
In order to solve the problems, the invention provides a cutting dust-settling and dust-reducing method for a fully mechanized excavation face of a coal roadway by comprehensively considering the difference characteristics of cutting dust production of a heading machine and aiming at the old pattern of the application of a 'rough' dust-settling technology, and the method can realize the 'accurate prevention and control' of dust.
In order to achieve the purpose, the invention provides a cutting dust-settling and dust-reducing method for a fully mechanized excavation face of a coal roadway, which comprises the following steps: by executing the steps A1 to A2, aiming at a sample coal roadway fully mechanized excavation working face serving as a control group, the fixed carbon content and the brittleness value of the coal of the control group are measured, and the optimal dust fall medium dosage of the control group is obtained; then executing the step C, aiming at the process that the target heading machine carries out cutting operation on the fully mechanized excavation face of the target coal roadway, and realizing the adjustment of the use amount of the dust fall medium;
a1, selecting a sample coal roadway fully-mechanized excavation working face as a control group, and measuring the fixed carbon content and the brittleness value of coal of the control group;
step A2, obtaining the optimal dust-settling medium dosage of the control group through the steps B1 to B3;
and B1, initializing t to 1, and recording the dosage of the dust fall medium used by the target heading machine in the process of cutting the sample coal roadway fully-mechanized excavation working face of the control group at the tth time as wt；
Step B2, the target heading machine is used for fully excavating sample coal roadways of the control groupCutting the surface for the t time, and using the dosage w of the dust fall mediumtChanging according to a preset rule, and calculating the dust fall rate eta after adopting dust fall measurest；
B3, judging whether t is equal to 1, if t is equal to 1, increasing the value of t by 1, and entering a step B2; otherwise, judge ηtWhether or not it is less than or equal to etat-1If ηtIs less than or equal to etat-1Recording the dosage w of the dust-settling medium used in the t-1t-1The optimal dosage of the dustfall medium is the optimal dosage of the dustfall medium of the control group; otherwise, increasing the value of t by 1, and entering the step B2;
and C, adjusting the dust-settling medium dosage of the fully-mechanized excavation face of the target coal roadway to a target dosage by measuring the fixed carbon content and the brittleness value of the coal of the fully-mechanized excavation face of the target coal roadway and combining the fixed carbon content and the brittleness value of the coal of the control group and the optimal dust-settling medium dosage of the control group.
As a preferred embodiment of the present invention: and D1 to D2 are executed to adjust the cutting pick conical angle and the cutting head rotating speed of the target heading machine, so that the method for reducing dust generated by cutting of the coal roadway fully mechanized excavation face is completed:
d1, measuring a tip cone angle A of a cutting tooth used by the cutting head of the target tunneling machine, and inquiring the rotating speed v of the cutting head of the target tunneling machine;
step D2., the cutting teeth used by the heading machine are replaced by cutting teeth with the conical angle of the cutting tip smaller than A, and the rotating speed of the cutting head is smaller than v when cutting.
As a preferred embodiment of the present invention: the rotating speed of the cutting head of the target tunneling machine is adjustable.
As a preferred embodiment of the present invention: the brittleness value is half of the product of the uniaxial compressive strength value of the coal and the brazilian disc splitting tensile strength value.
As a preferred embodiment of the present invention: the dustfall rate is calculated according to the following formula:
whereinEta is the dust fall rate; c. C0The original dust concentration; c. C1The dust concentration is measured after dust fall measures are adopted.
As a preferred embodiment of the present invention: the dust concentration is respiratory dust concentration.
As a preferred embodiment of the present invention: and C, adjusting the amount of the dust fall medium for the carbon content and the brittleness value of the fully mechanized excavation working face of different target coal roadways according to the following standards:
combination (1): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is higher than that of the control group, the brittleness value is lower than that of the control group, and the amount of the dust-settling medium is adjusted to be higher than the optimal amount of the dust-settling medium of the control group;
combination (2): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is higher than that of the control group, the brittleness value is higher than that of the control group, and the amount of the dust-settling medium is adjusted to be higher than the optimal amount of the dust-settling medium of the control group;
combination (3): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is lower than the fixed carbon content of the control group, the brittleness value is lower than the brittleness value of the control group, and the amount of the dust-settling medium is adjusted to be lower than the optimal amount of the dust-settling medium of the control group;
combination (4): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is lower than that of the control group, the brittleness value is higher than that of the control group, and the amount of the dust-settling medium is adjusted to be lower than the optimal amount of the dust-settling medium of the control group.
As a preferred embodiment of the present invention: compared with the optimal dust-fall medium dosage of a coal roadway fully mechanized excavation working face control group, the increase proportion of the dust-fall medium dosage of the combination (1) is more than a preset first threshold value; the increase proportion of the dust fall medium usage of the combination (2) is above a preset second threshold; the reduction ratio of the dust settling medium usage of the combination (3) to the dust settling medium usage of the combination (4) is preset to be the same fixed threshold; wherein the first threshold is higher than the second threshold.
As a preferred embodiment of the present invention: compared with the optimal dustfall medium dosage of a control group, the dustfall medium dosage of the combination (1) is increased by more than 60%; the dosage of the dust settling medium of the combination (2) is increased by more than 30 percent; the dosage of the dustfall media of the combination (3) and the combination (4) is reduced by more than 30 percent.
As a preferred embodiment of the present invention: combination (4) requires an increased frequency of deposited dust from periodic cleaning of equipment surfaces compared to combination (3).
Compared with the prior art, the cutting dust-settling and dust-reducing method for the fully mechanized excavation face of the coal roadway has the following technical effects:
the invention provides a cutting dust fall and dust reduction method for a coal roadway fully-mechanized excavation working face, which comprises the steps of firstly measuring the tip cone angle of a cutting tooth used by a cutting head of a heading machine, inquiring the rotating speed of the cutting head of the heading machine, and determining the cutting tooth structure and cutting working condition parameters of the heading machine; the cutting teeth used by the heading machine are replaced by the cutting teeth with the tip conical angles smaller, if the rotating speed of the heading machine is adjustable, the cutting is carried out at a lower rotating speed, so that the dust generation amount and the generation ratio of the respirable dust and PM2.5 can be effectively reduced, and the harm degree of the dust to a human body is fundamentally reduced. In order to realize accurate dust fall, the use amount of a more targeted dust fall medium is adopted in the dust treatment process, so that the cost performance of dust treatment is improved, a coal mine fully-mechanized excavation working face is selected as a control group, the fixed carbon content and the brittleness value (half of the product of the uniaxial compressive strength value of the coal and the Brazilian fracture tensile strength value) of the coal are measured, and the original concentration of the respiratory dust at a driver of the heading machine is measured. And adjusting the dosage of the dust-settling medium, measuring the residual concentration of the respiratory dust after the dust-settling technology is used and calculating the dust-settling rate after the dosage is adjusted once, respectively recording the dosage of the dust-settling medium and the dust-settling rate, and recording the dosage of the dust-settling medium corresponding to the maximum dust-settling rate as the optimal dosage of the dust-settling medium. Before the same dust fall technology is applied to the target fully-mechanized excavation face, the fixed carbon content and the brittleness value of coal are firstly measured, the fixed carbon content and the brittleness value of the coal are compared with those of the coal of a fully-mechanized excavation face control group, the dust production intensity of the target fully-mechanized excavation face can be estimated, and the dust fall medium dosage is adjusted on the basis of the optimal dust fall medium dosage according to four combinations: compared with a control group, the composition (1) has high fixed carbon content and low brittleness value, and the dosage of the dust-settling medium is increased by more than 60%; the combination (2) has high fixed carbon content and high brittleness value, and the dosage of the dust fall medium is increased by more than 30 percent; the combination (3) has low fixed carbon content and high brittleness value, and the dosage of dust fall media is reduced by more than 30 percent; the combination (4) has low fixed carbon content and low brittleness value, reduces the dosage of the dust fall medium by more than 30 percent, and has more attention to regularly cleaning the deposited dust on the surface of equipment than the combination (3). The dust suppression method has the advantages that the dust suppression medium consumption is adjusted in advance according to the measured coal properties, effective treatment of dust is realized earlier, meanwhile, the optimal dust suppression effect can be achieved on some working faces, the dust suppression medium consumption can be effectively reduced, the operation cost and the labor operation intensity of workers are reduced, and popularization and application of the dust suppression technology are facilitated.
Drawings
FIG. 1 is a flow chart of a cutting dust fall and reduction method of a coal roadway fully mechanized excavation face.
Detailed Description
The following description will explain embodiments of the present invention in further detail with reference to the accompanying drawings. Firstly, adjusting the conical angle of a cutting pick of a target tunneling machine and the rotating speed of a cutting head through steps D1 to D2 to reduce dust generated by cutting the coal roadway fully-mechanized tunneling working face, wherein the rotating speed of the cutting head of the target tunneling machine is adjustable, firstly measuring the conical angle A of the cutting pick of the cutting head of the target tunneling machine, and inquiring the rotating speed v of the cutting head of the target tunneling machine; secondly, the cutting teeth used by the heading machine are replaced by cutting teeth with the tip cone angle smaller than A, and the rotating speed of the cutting head is smaller than v when cutting.
The first embodiment is as follows: D1-D2 in the steps of the method are implemented to realize that the conical angle of a cutting tooth and the rotating speed of a cutting head are adjusted to reduce dust generated during cutting, the conical angle of the cutting tooth tip of the cutting tooth used by the cutting head of the heading machine in a certain mine in Guizhou province is 117 degrees, the rotating speed of the cutting head of the heading machine is two-stage adjustable at 46rpm and 23rpm, and when the conical angle of the cutting tooth tip is 117 degrees, the rotating speeds of the cutting tooth tip and the cutting head are respectively the total dust and the respiratory dust concentration under the conditions of 46rpm and 23rpm by adopting a direct-reading dust concentration measuring instrument; and the concentration values of the total dust and the respiratory dust under the condition that the conical angle of the cutting pick tip is 83 degrees and the rotating speed is 23rpm are shown in a table 1.
TABLE 1 dust concentration under different cutting conditions
As can be seen from the first embodiment, after the pick taper angle and the cutting head rotation speed are adjusted according to the steps D1 to D2, the concentration of dust generated during cutting is obviously reduced.
The method comprises the following steps of A1-A2, and aiming at a sample coal roadway fully mechanized excavation working face serving as a control group, the fixed carbon content and the brittleness value of the coal of the control group are measured, and the optimal dust fall medium dosage of the control group is obtained; then executing the step C, aiming at the process that the target heading machine carries out cutting operation on the fully mechanized excavation face of the target coal roadway, and realizing the adjustment of the use amount of the dust fall medium;
a1, selecting a sample coal roadway fully mechanized excavation working face as a control group, and determining the fixed carbon content and the brittleness value of the coal of the control group, wherein the brittleness value is half of the product of the uniaxial compressive strength value of the coal and the Brazilian disc splitting tensile strength value;
step A2, obtaining the optimal dust-settling medium dosage of the control group through the steps B1 to B3;
and B1, initializing t to 1, and recording the dosage of the dust fall medium used by the target heading machine in the process of cutting the sample coal roadway fully-mechanized excavation working face of the control group at the tth time as wt；
B2, performing the cutting operation for the t time on the sample coal roadway fully-mechanized excavation working face of the control group by the target development machine, wherein the used dust fall medium dosage wtChanging according to a preset rule, and calculating the dust fall rate eta after adopting dust fall measurestHere, the dustfall rate is calculated according to the following formula:
in the formula: etatThe dust fall rate is obtained; c. C0The original concentration of the respiratory dust at the driver of the development machine is mg/m 3; c. CtFor adopting dust-settling measuresThe concentration of respirable dust, mg/m3, was measured at the driver of the machine.
B3, judging whether t is equal to 1, if t is equal to 1, increasing the value of t by 1, and entering a step B2; otherwise, judge ηtWhether or not it is less than or equal to etat-1If ηtIs less than or equal to etat-1Recording the dosage w of the dust-settling medium used in the t-1t-1The optimal dosage of the dustfall medium is the optimal dosage of the dustfall medium of the control group; otherwise, increasing the value of t by 1, and entering the step B2;
and C, adjusting the amount of the dust-settling medium to the target amount of use according to the following standard by measuring the fixed carbon content and the brittleness value of the coal of the target coal roadway fully-mechanized excavation working face and combining the fixed carbon content and the brittleness value of the coal of the control group and the optimal amount of the dust-settling medium of the control group:
combination (1): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is higher than that of the control group, the brittleness value is lower than that of the control group, the amount of the dust-settling medium is adjusted to be higher than the optimal amount of the dust-settling medium of the control group, and the adjustment amount is more than 60%;
combination (2): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is higher than that of the control group, the brittleness value is higher than that of the control group, the amount of the dust-settling medium is adjusted to be higher than the optimal amount of the dust-settling medium of the control group, and the adjustment amount is more than 30%;
combination (3): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is lower than the fixed carbon content of the control group, the brittleness value is lower than the brittleness value of the control group, the dosage of the dust-settling medium is adjusted to be lower than the optimal dosage of the dust-settling medium of the control group, and the adjustment amount is more than 30%;
combination (4): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is lower than that of the control group, the brittleness value is higher than that of the control group, the amount of the adjusted dust-settling medium is lower than that of the optimal dust-settling medium of the control group, the amount of the adjusted dust-settling medium is more than 30%, and meanwhile, compared with the combination (3), the frequency of regularly cleaning the deposited dust on the surface of equipment needs to be increased.
The second and third examples correspond to the cases of the combination (2) and the combination (4) in the step C of the present invention, respectively, and are applied in combination with the actual cases;
example two: firstly, implementing steps A1 to A2 of the invention, selecting a Guizhou ore fully-mechanized excavation working face in the first embodiment as a control group, obtaining the fixed carbon content, the brittleness value and the optimal dust-fall medium dosage of the control group, then implementing step C of the invention, comparing the Anhui ore fully-mechanized excavation working face serving as a target working face with the control group, pre-adjusting the dust-fall medium dosage, realizing accurate dust fall, improving the dust-fall efficiency and the dust control performance-price ratio;
according to the step A1, the fixed carbon content and the brittleness value of the coal of the fully mechanized working face of a certain mineral in Guizhou are respectively 54.78% and 5.29;
according to the step A2, adjusting the dosage of the dustfall medium on the fully mechanized excavation face of the control group, measuring the residual concentration of the respiratory dust after the dustfall technology is used and calculating the dustfall rate of the respiratory dust after each dosage adjustment, respectively recording the dosage of the dustfall medium and the dustfall rate, and finally obtaining the dosage of the dustfall medium corresponding to the maximum dustfall rate (the residual respiratory dust concentration value is minimum) (the concentration of the foaming agent used by the dust suppression foam is 0.3%, and the average flow of the generated foam is 43 m)3/h) recording as the optimal dust fall medium usage;
according to the step C, it is determined that the coal of the target fully mechanized face (Anhui-Ore) has a fixed carbon content (58.35%) higher than that of the control group and a friability value (3.48) lower than that of the control group, which is the case of the combination (2) in the step C, thereby increasing the amount of the dust suppressing foam blowing agent used for the target fully mechanized face to 0.5 wt% (the average flow rate of the generated foam is 50 m)3H), the values of the total dust and respirable dust concentrations were determined without dustfall measure and with 0.3 wt% and 0.5 wt% of dust suppressing foam blowing agent, respectively, as shown in Table 2. The dustfall rate here is calculated according to the following formula:
in the formula: eta is the dust fall rate; c. C0In terms of original dust concentration, mg/m3；c1The dust concentration is mg/m measured after dust fall measures are adopted3The dust may be respiratory dust or total dust.
TABLE 2 dust concentration value of fully mechanized excavation face of Anhui mine
And (3) carrying out normality test and two independent sample t tests on the residual concentrations of the total dust and the respiratory dust under the conditions that the concentrations of the dust suppression foam foaming agent are 0.3 wt% and 0.5 wt%, and verifying the significance of the residual dust concentration difference under the conditions of different dust suppression medium dosages. After the test, the concentration of the total dust and the concentration of the respirable dust are both reduced after the concentration of the foaming agent is increased, and the average dust fall rates corresponding to the total dust and the respirable dust are respectively and obviously improved, which shows that if the amount of the dust fall medium adopted by the fully-mechanized excavation working face of a control group is used, the concentration of the residual dust on the fully-mechanized excavation working face of a certain mine still has a space for further reducing. Therefore, according to the method, the usage amount of the dust settling medium is increased by using the property comparison result of the coal, and the dust settling efficiency can be effectively improved.
Example three: according to the fixed carbon content, the brittleness value and the optimal dust suppression medium dosage of the comparison group of the Guizhou ore fully-mechanized coal mining surfaces obtained from the step A1 to the step A2 in the second embodiment, the step C of the invention is continuously carried out, and the fixed carbon content (51.22%) of the coal of the target fully-mechanized coal mining surface (the Shandong ore) is lower than that of the comparison group, the brittleness value (7.35) is higher than that of the comparison group, and the coal belongs to the combination (4) in the step C, so that the dosage of the dust suppression foaming agent of the target fully-mechanized coal mining surface is reduced to 0.1 wt%, and the average flow rate of generated foam is 30m3The values of the total dust and respirable dust concentrations were determined for the dust suppression foam blowing agent used in the amounts of 0.1 wt.% and 0.3 wt.%, respectively, without dust suppression measure, as shown in Table 3, and the dust reduction rate was calculated by referring to the formula in example II.
TABLE 3 dust concentration value of fully mechanized excavation face of Shandong mine
The significance of the difference in residual dust concentration between 0.1 wt% and 0.3 wt% of the dust suppressing foam blowing agent concentration was verified with reference to example two. Although the average dust fall rate is different under the condition of the concentrations of the two foaming agents, the residual concentrations of the total dust and the respirable dust are not obviously changed through inspection, so that the phenomenon of resource waste can be caused if the amount of a dust fall medium adopted by a control group fully-mechanized excavation working face is used, the operation cost of the dust fall technology is increased, but the dust fall effect is not obviously improved. In addition, if the spraying dust fall is adopted, the water accumulation on the working surface is more likely to be caused, the labor intensity of workers is increased, and the occurrence probability of accidents is increased.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A cutting dust fall and reduction method for a coal roadway fully mechanized excavation working face is characterized by comprising the following steps: by executing the steps A1 to A2, aiming at a sample coal roadway fully mechanized excavation working face serving as a control group, the fixed carbon content and the brittleness value of the coal of the control group are measured, and the optimal dust fall medium dosage of the control group is obtained; then executing the step C, aiming at the process that the target heading machine carries out cutting operation on the fully mechanized excavation face of the target coal roadway, and realizing the adjustment of the use amount of the dust fall medium;
a1, selecting a sample coal roadway fully-mechanized excavation working face as a control group, and measuring the fixed carbon content and the brittleness value of coal of the control group;
step A2, obtaining the optimal dust-settling medium dosage of the control group through the steps B1 to B3;
and B1, initializing t to 1, and recording the dosage of the dust fall medium used by the target heading machine in the process of cutting the sample coal roadway fully-mechanized excavation working face of the control group at the tth time as wt；
B2, performing the cutting operation for the t time on the sample coal roadway fully-mechanized excavation working face of the control group by the target development machine, wherein the used dust fall medium dosage wtChanging according to a preset rule, and calculating the dust fall rate eta after adopting dust fall measurest；
B3, judging whether t is equal to 1, if t is equal to 1, increasing the value of t by 1, and entering a step B2; otherwise, judge ηtWhether or not it is less than or equal to etat-1If ηtIs less than or equal to etat-1Recording the dosage w of the dust-settling medium used in the t-1t-1The optimal dosage of the dustfall medium is the optimal dosage of the dustfall medium of the control group; otherwise, increasing the value of t by 1, and entering the step B2;
and C, adjusting the dust-settling medium dosage of the fully-mechanized excavation face of the target coal roadway to a target dosage by measuring the fixed carbon content and the brittleness value of the coal of the fully-mechanized excavation face of the target coal roadway and combining the fixed carbon content and the brittleness value of the coal of the control group and the optimal dust-settling medium dosage of the control group.
2. The coal roadway fully mechanized excavation face cutting dust settling and reducing method according to claim 1, characterized in that: and D1 to D2 are executed to adjust the cutting pick conical angle and the cutting head rotating speed of the target heading machine, so that the method for reducing the dust generated by cutting the coal roadway fully-mechanized excavation face is completed:
d1, measuring a tip cone angle A of a cutting tooth used by the cutting head of the target tunneling machine, and inquiring the rotating speed v of the cutting head of the target tunneling machine;
step D2., the cutting teeth used by the heading machine are replaced by cutting teeth with the conical angle of the cutting tip smaller than A, and the rotating speed of the cutting head is smaller than v when cutting.
3. The coal roadway fully mechanized excavation face cutting dust settling and reducing method according to claim 2, characterized in that: the rotating speed of the cutting head of the target tunneling machine is adjustable.
4. The coal roadway fully mechanized excavation face cutting dust settling and reducing method according to claim 1, characterized in that: the brittleness value is half of the product of the uniaxial compressive strength value of the coal and the brazilian disc splitting tensile strength value.
5. The coal roadway fully mechanized excavation face cutting dust settling and reducing method according to claim 1, characterized in that: the dustfall rate is calculated according to the following formula:
wherein eta is the dust fall rate; c. C0The original dust concentration; c. C1The dust concentration is measured after dust fall measures are adopted.
6. The coal roadway fully mechanized excavation face cutting dust settling and reducing method according to claim 5, characterized in that: the original dust concentration and the dust concentration measured after the dust reduction measure are respiratory dust concentrations.
7. The coal roadway fully mechanized excavation face cutting dust settling and reducing method according to claim 1, characterized in that: c, adjusting the amount of the dust fall medium for the carbon content and the brittleness value of the fully mechanized excavation working face of different target coal roadways according to the following standards;
combination (1): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is higher than that of the control group, the brittleness value is lower than that of the control group, and the amount of the dust-settling medium is adjusted to be higher than the optimal amount of the dust-settling medium of the control group;
combination (2): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is higher than that of the control group, the brittleness value is higher than that of the control group, and the amount of the dust-settling medium is adjusted to be higher than the optimal amount of the dust-settling medium of the control group;
combination (3): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is lower than the fixed carbon content of the control group, the brittleness value is lower than the brittleness value of the control group, and the amount of the dust-settling medium is adjusted to be lower than the optimal amount of the dust-settling medium of the control group;
combination (4): the fixed carbon content of the fully mechanized excavation face of the target coal roadway is lower than that of the control group, the brittleness value is higher than that of the control group, and the amount of the dust-settling medium is adjusted to be lower than the optimal amount of the dust-settling medium of the control group.
8. The coal roadway fully mechanized excavation face cutting dust settling and reducing method according to claim 7, characterized in that: compared with the optimal dust-fall medium dosage of a coal roadway fully mechanized excavation working face control group, the increase proportion of the dust-fall medium dosage of the combination (1) is more than a preset first threshold value; the increase proportion of the dust fall medium usage of the combination (2) is above a preset second threshold; the reduction ratio of the dust settling medium usage of the combination (3) to the dust settling medium usage of the combination (4) is preset to be the same fixed threshold; wherein the first threshold is higher than the second threshold.
9. The coal roadway fully mechanized excavation face cutting dust settling and reducing method according to claim 8, characterized in that: compared with the optimal dustfall medium dosage of a control group, the dustfall medium dosage of the combination (1) is increased by more than 60%; the dosage of the dust settling medium of the combination (2) is increased by more than 30 percent; the dosage of the dustfall media of the combination (3) and the combination (4) is reduced by more than 30 percent.
10. The coal roadway fully mechanized excavation face cutting dust settling and reducing method according to claim 8, characterized in that: combination (4) requires an increased frequency of deposited dust from periodic cleaning of equipment surfaces compared to combination (3).
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| WO2020006816A1 (en) * | 2018-07-02 | 2020-01-09 | 山东科技大学 | Three-dimensional space dust control and removal method used for dust produced during bracket motion of fully mechanized mining face |
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| US5330671A (en) * | 1992-09-11 | 1994-07-19 | Pullen Erroll M | Fluid, formulation and method for coal dust control |
| CN102536236A (en) * | 2011-12-30 | 2012-07-04 | 中国矿业大学 | Settling, isolating and removing integrated dust prevention method of fully mechanized excavation face |
| CN107620607A (en) * | 2017-09-12 | 2018-01-23 | 中国矿业大学 | A kind of fully mechanized workface step subzone of atomization dust removal method |
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