安全工程专业英语复试专业翻译
圣诞树怎么画-胎儿双顶径标准
1、巷道围岩散热是通风巷道内的主要热源,
它对于矿井风温预测、
制定降温措施和计算掘进工作面的制冷量都是至关重要的.
过去计
算这一部分散热量时, 常常借助于有限差分法和有限单元法,
但这两
种方法运用到半无限体时, 势必要人为地假定外部边界,
使得数学模
型与实际有一定的偏差; 而且在具体操作中,
其求解规模和数据准备
量也较大.本文采用边界单元法,
将区域内部的积分问题转化到边界
上, 然后再以问题的基本解建立边界积分方程,
对时间和边界离散进
行数值计算
Heat
dissipation of roadway surrounding rock is the
main heat source
of ventilation roadway in it
for the mine air temperature prediction,
formulate measures to cool and calculated
tunneling working face
refrigerating capacity
is very important. In the past this part
calculated
heat release, often by means of
finite difference method and finite
element
method, but the two methods applied to the semi-
infinite body, is
bound to artificially
assumes that external boundary, makes the
mathematical model and the actual has certain
deviation; And, in the
concrete operation of
its scale and amount of data preparation is
larger.
This paper, by using the boundary
element method to convert problem
areas within
the integral to boundary, and then to question the
basic
solution of boundary integral equation,
the numerical calculation was
carried
out on the discrete time and boundary
2、治理采空区火灾工作要求对采空区遗煤氧化规律有全面的认识!
目前研究者普遍
认为工作面推进速度，遗煤的厚度和粒度，采空区漏
风情况以及遗煤自身的自燃特性影响着采空区的自然
发火的进度，然
而，采空区遗煤的自燃是一个非常复杂的物理化学变化过程，也是一
个多变的自
动加速放热过程!微观上煤的自燃过程就是一个煤表面分
子与氧不断地复合不停地发生各种氧化反应，连
续释放出反应热的过
程!当采空区其他条件相同时，如果遗煤的粒度不同，则采空区遗煤
表现出
来的氧化升温速度就不可能相同!因为煤的粒度不同，孔隙率
不同会导致煤的表面积不同，跟氧气结合的
表面活性结构的数量就不
同最后致使煤的氧化速度不一致!本文以煤氧复合理论为基础，通过
几
种粒径煤的氧化升温实验，尝试找出遗煤粒度对氧化速度的影响规
律!
Governance goaf fire work requirements of
traces of goaf coal oxidation
laws have a
comprehensive understanding of! Now researchers
widely
believe that working face advancing
speed, but the thickness of the coal
and granularity, goaf air leakage and
heritage of coal spontaneous
combustion
characteristics of its own influence the goaf
spontaneous
combustion progress, however,
traces of goaf coal spontaneous
combustion is
a very complex physical and chemical change
process, is
also a changeful heat release
process in automatic! On microscopic coal
spontaneous combustion process is a coal
surface molecules and oxygen
compound kept
constantly produces various oxidation reaction,
continuous release heat of reaction process.
Traces of other conditions for
the mined-out
area at the same time, if the coal particle size
is different,
the traces of mined-out area of
coal oxidation heating speed can not be
the
same! Because of coal particle size, porosity
different will lead to the
surface area of
coal, with the amount of oxygen combined with
structure
of the surface activity of different
final speed of coal oxidation
inconsistent! In
this paper, based on the theory of coal and oxygen
compound, by raising the temperature of
several kinds of particle size of
coal
oxidation experiment, trying to find out the
influence law of coal
particle size on the
oxidation rate of kin!
3、
瓦斯抽放是防治煤矿瓦斯灾害事故的根本措施，然而，对于低透
气性煤层，难以进行本煤
层抽放，用传统的瓦斯抽放法难以满足要求，
我国 95%以上的高瓦斯和突出矿井所开采的煤层属于低
透气性煤
层，透气性系数只有,瓦斯抽放难度非常大。据统计采空区瓦斯的抽
放量仅占总抽放量
的 15。铁煤集团在大兴矿 405
工作面成功地进
行了地面钻井抽放瓦斯试验，并把这一技术在铁法矿区 6
对具有同
样低透性煤层生产矿井中推广应用，获得了宝贵的经验
Gas
drainage is a fundamental measure of disaster
prevention and
treatment of coal mine gas
accident, however, for low permeability coal
seam, the seam drainage is difficult to use
conventional gas extraction
method is
difficult to meet the requirements of more than
95% of the high
gas and outburst mined coal
seams are low permeability, gas permeability
coefficient only, gas drainage very difficult.
According to statistics gob
gas pumping
drainage volume of the total volume accounted for
only 15.
Iron Daxing Coal Mine successfully in
the face of the ground 405 gas
drainage
drilling test and put this technology in Tiefa six
pairs with the
same low permeability coal mine
production application, gained valuable
experience
4、在压
力状态下，瓦斯赋存于煤层的微孔和裂隙中，工作面回采后，
原有的应力状态被破坏，工作面周围的应力
重新分布、变化，采空区
上覆岩层在一定范围内自下而上形成冒落带、裂隙带和弯曲下沉带，
下
覆岩层形成裂隙带和膨胀变形带。采用地面钻孔抽放采空区瓦斯，
在开采前先从地面向开采层的上部打一
些垂直钻孔，以便抽放采空区
瓦斯。当长壁回采工作面推过这些钻孔时，由于顶板的冒落和下沉使
上覆岩层产生裂隙，在钻孔抽放负压的作用下，聚集在裂隙中的瓦斯
就会渗透到钻孔
Under pressure, coal seam gas deposit in
the pores and cracks in the
mining face, the
original stress state is destroyed, the stress
redistribution
around the face, changes within
a certain range of the mined-out area
overlying strata bottom-up formation of caving
zone, fractured zone and
bending subsidence
zone, fractured zone under overburden formation
and
expansion deformation bands. Using ground
gob gas drainage drilling
before mining to
start mining for the upper layer to play some
vertical
drilling to gob gas drainage. When
longwall mining face pushed through
these
holes, because the roof caving and sinking so
overburden produce
fissures, in the role of
negative pressure drainage drilling, gathered in
the
cracks of the gas will penetrate into the
drill hole
5、采煤工作面推进速度[l]与采空区
自然发火2[]密切相关,直接影响其
严重程度。加快推进速度,能使升温中的遗煤更快速地进入到采空
区
窒息带。窒息带内漏风风速很小,氧浓度很低,这些遗煤不再氧化放热,
温度也将不再上升,
从而降低了采空区遗煤的自燃危险。研究表明存
在一个最小推进速度值,只要工作面推进速度持续大于该
值时便可有
效预防采空区自燃火灾。国内学者根据采空区内氧化带3[]的宽度与
煤最短自然发
火期的比值来作为预防采空区自燃的工作面最小安全
推进度。但采空区氧化带难以准确界定,所得出的最
小安全推进速度
往往偏小。此外,工作面风量也是影响采空区自然发火的重要因素。
供风量增大
,引起工作面两端压差增大,导致漏入采空区的风量也增大,
为遗煤氧化放热反应提供了更为充足的氧气
,由此增大了采空区的自
然发火危险。但现阶段多数关于最小安全推进速度的研究忽视了工作
面
风量不同所带来的影响。为此,在不同供风量条件下,将采空区自然
发火数值模拟与煤自燃临界温度结合
起来研究综采面最小安全推进
速度。
Coalface
advance speed [l] and Spontaneous Combustion 2 [ ]
are closely
related , directly affecting its
severity. Accelerate the speed of warming in
the genetic make coal more quickly into the
mined-out area with
suffocation . Suffocation
wind band leakage is small, the oxygen
concentration is low, these are no
longer exothermic oxidation of coal
left , the
temperature will not rise , thereby reducing Gobs
of coal
spontaneous combustion hazard. Studies
have shown that the presence of
a minimum
forward speed value , as long as the continuous
advance
speed is greater than the face value
can be effective in preventing Gob
fires. The
ratio of domestic scholars of spontaneous
combustion of coal in
accordance with the
minimum width of the mined area oxidized zone 3 [
]
to a preventive Gob 's face minimum safety
advance degrees. But Gob
oxidation zone is
difficult to define precisely , the resulting
minimum safe
forward speed is often too small.
In addition, the face amount of wind is
also
an important factor Spontaneous Combustion impact.
Supply air
volume increases, causing increased
pressure at both ends of the face ,
causing
leakage into the mined-out area of air volume also
increased, as
the exothermic oxidation
reaction of residual coal provides more
adequate oxygen , thereby increasing the
mined-out area the danger of
spontaneous
combustion . But most on the minimum safe speed
propulsion research stage, ignoring the
effects of different amounts of
wind brought
face . To this end, for the amount of wind in
different
conditions, Spontaneous Combustion
of Coal Spontaneous Combustion
Simulation and
study the critical temperature combine to promote
mechanized mining face minimum safe speed .