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渣漿泵漿體管路損失確定方法研究概況
漿體管路水頭損失，隨著漿體中所含固體顆粒粒徑、固體物相對(duì)密度、漿體濃度等因素的不同而變化。漿體管路水頭損失是以清水管路水頭損失為基礎(chǔ)。下面簡(jiǎn)要介紹一下漿體管路損失確定方法研究概況。
一、均質(zhì)漿體管路水頭損失確定方法
固體物料所有固體顆粒小于0. lmm,重量濃度C≤30%，體積濃度C≤15%的漿體，屬于均質(zhì)漿體，不需考慮固體顆粒的沉降。其管路水頭損失與清水時(shí)基本相同。因此，水頭損失和管路特性曲線，可以按照清水時(shí)的辦法求得.
二、典型漿體管路水頭損失確定方法
典型漿體是指固體顆粒粒徑dso =0.1~03mm,重量濃度C_≤40%，體積濃度C.≤20%的漿體。
沃曼公司在選型手冊(cè)中認(rèn)為，這類渣漿泵漿體的管路水頭損失有如下特點(diǎn):在同樣的管路條件下，當(dāng)漿體流速為其臨界沉降流速的0.7倍(V=0.7V.) 時(shí)漿體的水頭損失與清水以漿體臨界沉降流速流動(dòng)(v=V2) 時(shí)的水頭損失相同;當(dāng)漿體流速為其臨界沉降流速的1.3倍(V=1.3V2)時(shí)，漿體水頭損失與清水以同樣流速流動(dòng)時(shí)的水頭損失相同。將上述情況示在H V坐標(biāo)系中，如圖1-4- 1所示，用曲線將點(diǎn)C和B連接起來且在點(diǎn)B處相切，就得到漿體管路特性(阻力)出線。
三、非典型漿體管路水頭損失研究方法
非典型漿體是指固體額粒徑da>0.3mm、體積液度c,≤20%的某體，確定這種漿體管路鎖失的方法是，將流速V-V,時(shí)清水水頭損失作為漿體水頭損失，而漿體損失與清水時(shí)水頭損失相同時(shí)的流速計(jì)算（何希杰已給出了具體表達(dá)式），再用光滑曲線將這兩點(diǎn)連接起來，就可以得到漿體管路損失曲線。
如果給定漿體有關(guān)參數(shù)C. di.)和現(xiàn)場(chǎng)工況條件，就可以算出V.、K和K，值，這樣根據(jù)上述公式確定不同流速V時(shí)的漿體管路水頭損失H.值然后根據(jù)選型程序，計(jì)算有關(guān)參數(shù)值，就可以選擇適合現(xiàn)場(chǎng)工況條件要求的泵型。
Overview of research on determination method of slurry pipeline loss in slurry pump
The head loss of slurry pipeline varies with the size of solid particles, the relative density of solid and the concentration of slurry. The head loss of slurry pipeline is based on the head loss of clear water pipeline. The following is a brief introduction of slurry pipeline loss determination methods.
1. Method to Determine Head Loss of Homogeneous Slurry Pipeline
All solid particles of solid material are less than 0. lmm, and the slurry with weight concentration C < 30% and volume concentration C < 15%. It belongs to homogeneous slurry and does not need to consider the settling of solid particles. The head loss of pipeline is basically the same as that of clear water. Therefore, the head loss and pipeline characteristic curve can be obtained according to the method of clear water.
2. Determination of Head Loss in Typical Slurry Pipeline
Typical slurry is slurry with solid particle size DSO = 0.1~03mm, weight concentration C less than 40%, volume concentration C less than 20%.
In the selection manual, Walman Company considers that the head loss of slurry in the slurry pipeline of this kind of slurry pump has the following characteristics: under the same pipeline conditions, when the slurry velocity is 0.7 times of its critical sedimentation velocity (V=0.7V.), the head loss of slurry is the same as that of clear water flowing at the slurry critical sedimentation velocity (V=V2); When the critical sedimentation velocity is 1.3 times (V=1.3V2), the head loss of slurry is the same as that of clear water when it flows at the same velocity. The above situation is shown in the H-V coordinate system. As shown in Fig. 1-4-1, the slurry pipeline characteristics (resistance) can be obtained by connecting points C and B with curves and tangential at point B.
3. Research methods of head loss in atypical slurry pipelines
Atypical slurry refers to a body with solid particle size Da > 0.3mm, volume liquid degree C and less than 20%. The method to determine the lock-in loss of slurry pipeline is to take the loss of clear water head as slurry head loss when the flow velocity V-V, and calculate the flow velocity when the slurry loss is the same as that of clear water head (He Xijie has given the specific expression), and then use it. By connecting these two points with smooth curve, slurry pipeline loss curve can be obtained.
Given the parameters C. di.) of slurry and the working conditions on site, the values of V., K and K can be calculated, so that the head loss H. of slurry pipeline at different flow velocities V can be determined according to the above formulas, and then the relevant parameters can be calculated according to the selection program, so that the pump type suitable for the working conditions on site can be selected.
