本文選題：高固氣比 + 阻力損失�。� 參考：《西安建筑科技大學(xué)》2015年碩士論文

【摘要】：外循環(huán)式高固氣比分解爐利用離心分離的原理選擇性地讓粗顆粒物料作爐外循環(huán)。工程實(shí)踐表明其具有熱穩(wěn)定性好,單位容積熱負(fù)荷率高,分解效率高等優(yōu)勢(shì),同時(shí)對(duì)降低有害氣體的排放有明顯的效果。為進(jìn)一步豐富該爐型的基礎(chǔ)數(shù)據(jù),優(yōu)化結(jié)構(gòu)和操作參數(shù),本論文以粉體工程研究所研發(fā)的基礎(chǔ)爐型結(jié)構(gòu)為基礎(chǔ),通過(guò)冷態(tài)模擬試驗(yàn),考察外循環(huán)式高氣比分解爐系統(tǒng)中三次風(fēng)管入口風(fēng)速和分離器底部結(jié)構(gòu)參數(shù)與系統(tǒng)阻力損失、外循環(huán)率、分離特性之間的對(duì)應(yīng)數(shù)量關(guān)系,為后續(xù)工業(yè)裝置的優(yōu)化設(shè)計(jì)提供基礎(chǔ)參數(shù)。研究得到以下結(jié)論:(1)隨著分解爐截面風(fēng)速的增大,外循環(huán)系統(tǒng)和各單體結(jié)構(gòu)的阻力損失逐漸增大。粗分離器集料下錐體結(jié)構(gòu)參數(shù)變化對(duì)外循環(huán)系統(tǒng)的阻力損失影響顯著。粗分離器集料軸心位置變化對(duì)阻力損失的影響遠(yuǎn)大于錐體面積變化產(chǎn)生的影響�？蛰d條件下,OS1型錐體結(jié)構(gòu)對(duì)應(yīng)的阻力損失最小。負(fù)荷狀態(tài)下,DS1型錐體結(jié)構(gòu)對(duì)應(yīng)的阻力特性最優(yōu)。當(dāng)分解爐截面風(fēng)速相同,隨著三次風(fēng)速的增加,分解爐上行管阻力損失增加。在分解爐截面風(fēng)速=5.0m/s~8.0m/s范圍內(nèi),帶料負(fù)荷(z=0.5)比空載運(yùn)行時(shí)的外循環(huán)系統(tǒng)阻力損失增加約3.0%~12.0%。(2)對(duì)高效分離器,隨著分解爐截面風(fēng)速增大,分離效率ηg先增大,后有所降低。在風(fēng)速=6m/s時(shí)分離效率ηg最高。粗分離器下錐體結(jié)構(gòu)參數(shù)的改變對(duì)外循環(huán)系統(tǒng)的循環(huán)率有較大影響,粗分離器的總分離效率變化趨勢(shì)為隨us增大先減小,再增大。七種錐體結(jié)構(gòu)參數(shù)中,IS1型結(jié)構(gòu)對(duì)應(yīng)的外循環(huán)率最高,其余按CS3型、CS1型、CS2型、DS1型、USI型、OS1型結(jié)構(gòu)依次外循環(huán)率降低。(3)對(duì)同一粗分離器錐體結(jié)構(gòu),當(dāng)=5~6m/s,=26~28m/s時(shí),或當(dāng)=7~8m/s,=24m/s時(shí),同一顆粒粒徑dp的分級(jí)效率較高;粗分離器下錐體結(jié)構(gòu)參數(shù)變化對(duì)分級(jí)效率影響很大。物料顆粒粒徑在dp40μm和dp55μm時(shí),分級(jí)效率變化幅度很小,即對(duì)風(fēng)速us變化不敏感,顆粒粒徑在40μmdp55μm范圍內(nèi),分級(jí)分離效率變化幅度較大,即風(fēng)速us對(duì)分級(jí)分離效率影響明顯,在=6~7m/s時(shí),粗分離器能夠?qū)⑤^多的粗顆粒收集下來(lái)再次循環(huán)進(jìn)入分解爐。
[Abstract]:The external circulation high solid gas ratio calciner uses the centrifugal separation principle to selectively let the coarse particle material as the outside circulation. The engineering practice shows that it has the advantages of good thermal stability, high heat load per unit volume, high decomposition efficiency and so on. At the same time, it has obvious effect on reducing the emission of harmful gases. In order to further enrich the basic data of the furnace and optimize the structure and operation parameters, this paper is based on the basic furnace structure developed by the Institute of Powder Engineering. The quantitative relationship between the inlet wind speed of the tertiary air tube and the bottom structure parameters of the separator and the system resistance loss, the external circulation rate and the separation characteristics in the external circulation high gas ratio calciner system is investigated. To provide the basic parameters for the optimization design of the subsequent industrial plant. The following conclusions are obtained: (1) with the increase of the cross-section wind velocity of the calciner, the resistance loss of the external circulation system and the individual structure increases gradually. The change of structural parameters of cone under coarse separator aggregate has a significant effect on the resistance loss of external circulation system. The influence of the axial position of coarse separator on the resistance loss is much greater than that on the area of cone. Under the condition of no load, the resistance loss corresponding to the type of OSI 1 pyramidal structure is minimum. The resistance characteristics of the type DS 1 conical structure are optimized under load condition. When the cross section of the calciner is the same, with the increase of the third wind speed, the resistance loss of the tube on the calciner increases. In the range of wind speed of 5.0 m / s to 8.0 m / s, the resistance loss of external circulation system with charge load increases by about 3.0m / s compared with that of no-load operation. For the high-efficiency separator, the separation efficiency 畏 g increases first and then decreases with the increase of the cross-section wind velocity of the calciner. At the wind speed of 6 m / s, the separation efficiency 畏 g is the highest. The change of the structure parameters of the cone under the coarse separator has a great influence on the circulation rate of the external circulatory system. The total separation efficiency of the coarse separator decreases first and then increases with the increase of us. Of the seven conical structure parameters, the outer circulation rate corresponding to the IS1 structure is the highest, while the outer circulation rate of the rest is decreased according to the CS3 / CS1 / CS2 / DS1 / USI / USI / US1 structure.) for the same coarse separator pyramidal structure, when 5 / 6 m / s / s is 2628m / s, or when 78-ms-1 / s / s is over 24m/ s, The classification efficiency of the same particle diameter DP is higher, and the change of the structure parameters of the cone under the coarse separator has a great influence on the classification efficiency. When the particle size is in the range of dp40 渭 m and dp55 渭 m, the fractionation efficiency varies very little, that is, it is insensitive to the change of wind speed us, and the particle size is in the range of 40 渭 mdp55 渭 m, the fractionation efficiency varies greatly, that is, the wind velocity us has a significant effect on the fractionation efficiency, and when the particle size is in the range of 6 渭 mdp55 / s, The coarse separator can collect more coarse particles and recycle into the calciner again.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ172.6

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 彭新戰(zhàn);周勇敏;張少明;胡道和;吳石福;王輝;;循環(huán)流化床新型分料器的性能[J];南京工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);1993年S1期

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本文編號(hào)：1908975