發(fā)布時(shí)間：2018-06-25 16:01

  本文選題：真空制冰 + 氣動(dòng)輸送��； 參考：《武漢理工大學(xué)》2013年碩士論文

【摘要】：對(duì)于一個(gè)超過1000m深度甚至更深的礦井來說,一個(gè)很大的難題就是如何設(shè)計(jì)一個(gè)可行的制冷系統(tǒng)以保證井下有一個(gè)較好的工作環(huán)境。然而僅僅依靠通風(fēng)系統(tǒng)是無法帶走全部熱量帶走的,因此使用冷水作為冷媒來吸收并帶走大部分的熱量,吸收熱量后升溫的水再被水泵打到地面。但是利用冷水存在一些問題,例如用水量大,沿程溫升,滲漏等；如果利用冰來代替水作為冷媒,在吸收井下同等熱量的情況下,將節(jié)省四分之一的用量,這節(jié)約了很大的能源和費(fèi)用。因此,本文不同于以往研究冷水做冷媒,而是研究冰作為冷媒的礦井制冷系統(tǒng)。 一般而言,礦井管道輸送有兩種形態(tài)的冰：一種稱為硬冰,一種稱為冰漿。硬冰就是完全干燥的冰,按形狀不同又可以分為片冰、板冰、顆粒冰等；冰漿就是通過脫水冰水混合物制得,其中含有大概65%~75%冰晶固體。不同形態(tài)的冰有不同的制取方式,本文主要研究真空制冰方式。 由于輸冰的形態(tài)不同,輸冰管路系統(tǒng)的設(shè)計(jì)也各有特點(diǎn)。一個(gè)完整的輸冰系統(tǒng)管路包括若干水平和垂直部分。如何順利地將冰從地面輸送至井下,采用何種輸送方式,是本文研究的重點(diǎn)。對(duì)于氣動(dòng)輸冰而言,系統(tǒng)設(shè)計(jì)主要考慮的是如何防止冰堵,可保證輸送又具有經(jīng)濟(jì)性的輸氣速度為多大,冰漿和冰粒在管道中的流動(dòng)和壓降情況如何等因素。因?yàn)楣艿垒敱鶗r(shí),空氣占據(jù)了絕大部分的體積分?jǐn)?shù),因此空氣和冰的流動(dòng)可以近似地看成是一個(gè)關(guān)于空氣和潮濕固體的兩相流。
[Abstract]:For a mine more than 1000m deep or deeper, a big problem is how to design a feasible refrigeration system to ensure a better working environment. However, the ventilation system alone cannot take all the heat away, so cold water is used as a refrigerant to absorb and take away most of the heat, and then the heated water is pumped to the ground. However, there are some problems with using cold water, such as high water consumption, rising temperature along the path, leakage, etc. If ice is used instead of water as refrigerant, it will save 1/4 of the amount of water if it absorbs the same heat in the downhole. This saves a lot of energy and costs. Therefore, this paper is different from previous research on cold water as refrigerant, but on mine refrigeration system of ice as refrigerant. Generally speaking, mine pipes carry two types of ice: one called hard ice and one called ice slurry. Hard ice is completely dry ice, which can be divided into pieces of ice, plate ice, granular ice and so on according to different shapes. Ice slurry is made from a mixture of dehydrated ice water, which contains about 65% of ice crystal solids. Different forms of ice have different ways of making ice. Because of the different shape of ice transportation, the design of ice pipeline system has its own characteristics. A complete ice conveying system includes several horizontal and vertical parts. How to smoothly transport ice from the ground to the underground and how to transport it is the focus of this paper. As far as pneumatic ice transportation is concerned, the system design is mainly concerned with how to prevent ice blockage, how large the gas transport speed is, what the flow and pressure drop of ice slurry and ice particles are in the pipeline. Because the air takes up most of the volume fraction when the pipe ice is transported, the flow of air and ice can be approximately regarded as a two-phase flow of air and moist solid.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TD727

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本文編號(hào)：2066627