空氣重介流化床干法選煤機結構改進設計

機械論文編號:JX344  所有圖紙,任務書。論文字數:30208.頁數:60

目  錄

1 緒論
  1.1我國能源的現狀………………………………………………………2
  1.2選煤技術簡介………………………………………………………2
  1.2.1選煤技術分類………………………………………………………2
  1.2.2干法選煤技術的發展過程………………………………………3
  1.2.3研究干法選煤技術的重要意義 ………………………………………6
  1.3空氣重介干法選煤技術簡介…………………………………………7
  1.3.1空氣重介干法選煤技術的原理……………………………………7
  1.3.2空氣重介干法選煤技術的發展……………………………………7
  1.3.3傳統空氣重介流化床選煤機的結構簡介……………………………10
  1.4傳統空氣重介流化床選煤機的特點及存在問題 ……………………11
  1.5 本設計在傳統方案上的一些改進……………………………………14
  1.6 本章小結 ………………………………………………………………16
2 空氣重介流化床選煤機機構總體設計
 2.1排料裝置的機構設計……………………………………………………17
 2.2布風板的結構設計  ……………………………………………………19
 2.3選煤機傳動方案的確定  ………………………………………………22
 2.4本章小結…………………………………………………………………23
3 流化床選煤機刮板運輸裝置的設計計算
 3.1有關原始數據的說明……………………………………………………24
 3.2輸送能力的計算…………………………………………………………24
 3.3刮板的設計計算…………………………………………………………25
 3.4鏈及鏈輪的設計計算……………………………………………………26
 3.5運行阻力的計算…………………………………………………………30
 3.6電動機功率的校核………………………………………………………32
 3.7緊鏈力和刮板強度的計算………………………………………………32
 3.8鏈輪軸的設計計算………………………………………………………34
 3.9本章小結…………………………………………………………………38
4 流化床布風裝置的設計計算
 4.1布風結構的設計…………………………………………………………39
 4.2布風裝置參數的確定……………………………………………………43
 4.3本章小結…………………………………………………………………44
5 激振裝置的設計
 5.1結構設計………………………………………………………………45
 5.2主要參數的計算………………………………………………………47
 5.3激振中心的確定………………………………………………………48
 5.4激振器的選型…………………………………………………………50
 5.5安裝運行………………………………………………………………51
 5.6本章小結………………………………………………………………51
6  排矸裝置的設計
 6.1排矸裝置的設計………………………………………………………52
  6.2傳感器的選型…………………………………………………………53
 6.3本章小結………………………………………………………………54
參考文獻………………………………………………………………………55

致謝……………………………………………………………………………56

摘   要

     我國是一個資源分布不平橫的國家。近幾年西部開發發現了西部的大量煤田。隨著選煤工業的發展，傳統的濕法選煤對水的要求量極大，不適應西部選煤生產的要求。而傳統干法的污染大。在上個世紀我國就開始了空重介流化床選煤技術的研究，取得了很大的成果。隨著全粒級煤炭的高效干法分選的實現將促進選煤事及潔凈煤技術的進一步發展。
論文討論了潔凈煤分選技術的意義和現狀、各種干法分選方法的特點以及空氣重介質流化床選煤技術的優越性。在傳統空氣重介流化床干法選煤機的基礎上,針對實際使用中出現的問題, 空氣重介質流化床選煤技術具有分選精度高、投資少、環境污染小、分選密度調節范圍寬等特點。我在設計中主要設計了選煤機專用刮板輸送機、布風板、振動裝置。在設計中嘗試進行了一些更新。為解決布風不均的問題,設計了一種新型的振動式氣體布風板。為了排放矸石,設計了一套排矸裝置,可以實現定量排矸。在設計中借鑒了直線振動篩的工作原理、結構設計及主要參數的設計過程。

關鍵詞：潔凈煤； 空氣重介； 流化床；
ABSTRACT

China is an uneven distribution of resources cross country. In recent years the development of the western region found a large number of western coalfield. Coal industry with the development of the traditional wet coal preparation of the water requirements of the large and does not meet Western Coal production requirements. Moreover, the traditional method of stem pollution. In the last century, China started on the heavy air-fluidized bed coal preparation technology, has made great achievements. The latest development of air heavy medium fluidized bed coal separation technology were discussed. The high efficient coal dry separation of whole size range is expected to come into application and the application will promote the further development of the coal separation undertaking and the coal cleaning technology.
The significance and present situation of clean coal technology were discussed. Characteristics of different dry coal beneficiation methods and advantages of air dense medium fluidized bed were introduced in paper. The air dense_medium fluidized bed technique is of high precision, low investment, wide range of density, and no environment pollution. I designed primarily designed for use exclusively Coal scraper conveyor, the grid plate, vibration device. On the base of previous air dense_medium fluidized bed separator, some renovation is done to solve the problem in use. In order to solve the unequality of the wind when it goes through the wind through board, the design gives a new board which is oscillated. The paper also designs an equipment for the excluding of the refuse, which can let the refuse out of the separator in set quality. I constructive the working principle, structure design and major parameters design process of linear vibrating screen, in this paper.

Keywords：clean coal;  air dense_medium; fluidized bed