本文選題：煤泥水　切入點(diǎn)：脫水機(jī)　出處：《安徽理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：在選煤廠中,細(xì)顆粒物料的脫水較為困難,通常采用的脫水機(jī)械主要有壓濾機(jī)等脫水設(shè)備。壓濾機(jī)的脫水效果相對(duì)較好,但由于其屬于間斷式工作方式,工作周期太長(zhǎng),工作效率低,不適用于連續(xù)處理煤泥水的狀況。因此在連續(xù)給料的情況下如何提高脫水效率以獲得細(xì)顆粒物料是一個(gè)亟待解決的技術(shù)問(wèn)題。 針對(duì)此問(wèn)題,根據(jù)生產(chǎn)需要,本文設(shè)計(jì)了一種脫水效率高的新型立式螺旋篩網(wǎng)脫水機(jī)。介紹了該機(jī)的具體結(jié)構(gòu)組成、工作原理和技術(shù)特性。分析和設(shè)計(jì)了立式螺旋篩網(wǎng)脫水機(jī)關(guān)鍵部件的結(jié)構(gòu)參數(shù)。 本脫水機(jī)包括沿豎直方向設(shè)置在殼體中的螺旋輸送器,螺旋輸送器的外側(cè)套設(shè)有篩網(wǎng),螺旋輸送器和篩網(wǎng)均呈倒置的圓臺(tái)狀,篩網(wǎng)的下端呈敞口狀,且篩網(wǎng)下端敞口處的外側(cè)設(shè)有環(huán)狀的分隔板；螺旋輸送器的上轉(zhuǎn)軸穿過(guò)篩網(wǎng)并伸出在殼體的頂部外側(cè),上轉(zhuǎn)軸中穿設(shè)有送料管,且上轉(zhuǎn)軸靠近螺旋輸送器本體的一端設(shè)有噴料口,螺旋輸送器的下轉(zhuǎn)軸伸出在殼體的底部外側(cè),且下轉(zhuǎn)軸處設(shè)置有支撐裝置；所述上轉(zhuǎn)軸或下轉(zhuǎn)軸處還設(shè)置有驅(qū)動(dòng)螺旋輸送器轉(zhuǎn)動(dòng)的驅(qū)動(dòng)裝置；本脫水機(jī)經(jīng)過(guò)過(guò)濾脫水和擠壓脫水的雙重脫水作用,進(jìn)行對(duì)細(xì)顆粒物的脫水。 在充分考慮選煤廠實(shí)際應(yīng)用的基礎(chǔ)上,對(duì)本文對(duì)所設(shè)計(jì)的脫水機(jī)進(jìn)行了fluent模擬和實(shí)驗(yàn)?zāi)M。在螺旋篩網(wǎng)垂直沉降離心機(jī)流體模擬中,分別以清水以及不同比重物質(zhì)為試驗(yàn)對(duì)象,模擬一定的轉(zhuǎn)速下各個(gè)物質(zhì)流場(chǎng)流速的分布以及粒子的軌跡分布,從而表征不同的流速下,不同比重粒子軌跡偏移量,來(lái)說(shuō)明離心脫水機(jī)的脫水效果。在實(shí)驗(yàn)?zāi)M中,本文是以煤水混合物為原料,進(jìn)行了固液分離生產(chǎn)性能試驗(yàn)。研究了進(jìn)料量、物料粒度、和不同濃度的煤泥水對(duì)煤水混合物脫水率、處理量和設(shè)備能耗等性能指標(biāo)的影響,并對(duì)立式螺旋篩網(wǎng)脫水機(jī)的工藝參數(shù)進(jìn)行了優(yōu)化選擇。試驗(yàn)結(jié)果表明：此螺旋篩網(wǎng)垂直沉降式脫水機(jī)運(yùn)用螺旋給料擠壓及重力脫水原理,具有良好的脫水效果,脫水率≤75%,生產(chǎn)量≥8t/h,設(shè)備能耗≤1.5kw·h/t,該設(shè)備固液分離方式性能優(yōu)越,能較好滿足煤泥水固液分離生產(chǎn)要求。
[Abstract]:In the coal preparation plant, the dehydration of fine particle materials is more difficult. The dehydration machines are mainly used in filter press and other dehydration equipment. The dehydration effect of filter press is relatively good, but because of its intermittent working mode, the working period is too long. The working efficiency is low and it is not suitable for the continuous treatment of coal slime water. Therefore, how to improve the dehydration efficiency in order to obtain fine particle material under the condition of continuous feed is a technical problem to be solved urgently. In order to solve this problem and according to the need of production, a new type of vertical screw-screen dehydrator with high dehydration efficiency is designed in this paper. The concrete structure of the machine is introduced. Working principle and technical characteristics. Structural parameters of key components of vertical spiral screen dehydrator are analyzed and designed. The dehydrator comprises a spiral conveyer arranged in the shell in the vertical direction, the outer sleeve of the spiral conveyor is provided with a screen net, the spiral conveyer and the screen net are in the shape of an inverted round platform, and the lower end of the screen net is open. The outer side of the lower end of the screen is provided with a annular separator; the upper shaft of the spiral conveyer passes through the screen net and protrudes outside the top of the shell, and the upper shaft is pierced with a feeding tube. One end of the upper shaft near the screw conveyor body is provided with a material injection port, the lower rotary shaft of the screw conveyer is protruded outside the bottom of the shell, and the lower rotary shaft is provided with a support device. The upper or lower rotating shaft is also provided with a driving device for driving the rotation of the screw conveyer; the dehydration machine carries out the dehydration of fine particles through the dual dehydration of filtration dehydration and extrusion dehydration. On the basis of fully considering the practical application of coal preparation plant, the fluent simulation and experimental simulation of the designed dehydrator are carried out in this paper. Taking clear water and different specific gravity substances as experimental objects, the velocity distribution and particle trajectory distribution of each material flow field at certain rotational speed are simulated, so as to characterize the trajectory migration of particles with different specific gravity at different velocities. In the experiment simulation, the production performance test of solid-liquid separation was carried out with the mixture of coal and water as raw material. And the effects of different concentrations of slime water on the dehydration rate, treatment capacity and equipment energy consumption of coal-water mixture, The experimental results show that the screw feed extrusion and gravity dehydration principle are applied to the vertical settling type dehydrator, which has a good dehydration effect. The dehydration rate 鈮，

本文編號(hào)：1642008