【摘要】：結(jié)合工程實(shí)例,對(duì)長(zhǎng)距離重力流輸水工程中減壓消能技術(shù)進(jìn)行了分析,介紹了減壓閥的設(shè)置方式,并對(duì)其口徑選擇及配套設(shè)施進(jìn)行了分析。根據(jù)可調(diào)式減壓閥的特點(diǎn),結(jié)合典型工程實(shí)例,對(duì)減壓方案進(jìn)行了比選,采用兩級(jí)減壓方案較為經(jīng)濟(jì)合理。利用KYpipe2010水錘分析軟件進(jìn)行了數(shù)學(xué)模擬計(jì)算,通過對(duì)穩(wěn)態(tài)分析我們發(fā)現(xiàn),設(shè)計(jì)在正常運(yùn)行工況下,一、二級(jí)減壓閥減壓比均小于3,發(fā)生氣蝕的可能性很小;在極端小流量工況下二級(jí)減壓閥后減壓比大于3,氣蝕系數(shù)為0.52,閥后會(huì)出現(xiàn)氣蝕現(xiàn)象,為防止氣蝕發(fā)生,在二級(jí)減壓閥處并聯(lián)一個(gè)小口徑的網(wǎng)孔套筒式調(diào)節(jié)閥(DN400),在小流量及極端小流量工況下,關(guān)閉大的減壓閥,開啟網(wǎng)孔套筒式調(diào)節(jié)閥,防止氣蝕破壞;通過對(duì)關(guān)閥水錘計(jì)算,可以看出,末端關(guān)閥和減壓閥的關(guān)閉存在一定的時(shí)間差,末端關(guān)閥時(shí)間應(yīng)大于到減壓閥處的壓力波的傳導(dǎo)時(shí)間,以確保減壓閥正常關(guān)閉,達(dá)到減壓效果。
[Abstract]:Combined with an engineering example, this paper analyzes the energy dissipation technology of decompression in long distance gravity flow water conveyance project, introduces the setting mode of the pressure reducing valve, and analyzes its caliber selection and supporting facilities. According to the characteristics of adjustable pressure reducing valve and combined with typical engineering examples, the decompression scheme is compared and selected, and the two-stage decompression scheme is more economical and reasonable. By using the KYpipe2010 water hammer analysis software, the mathematical simulation calculation is carried out. Through the steady state analysis, we find that under the normal operation condition, the decompression ratio of the two stage pressure reducing valve is less than 3, and the possibility of cavitation corrosion is very small. In the extreme small flow condition, the pressure reduction ratio behind the two-stage pressure reducing valve is greater than 3, and the cavitation coefficient is 0.52.The phenomenon of cavitation corrosion will occur behind the valve, in order to prevent cavitation from occurring, A small diameter reticulated sleeve regulating valve (DN400) is connected at the secondary pressure reducing valve. Under the condition of small flow rate and extreme small flow rate, the large pressure reducing valve is closed, and the mesh sleeve regulating valve is opened to prevent cavitation damage. It can be seen that there is a certain time difference between the closing of the end valve and the valve, and the time of the end valve closing should be longer than the conduction time of the pressure wave to the pressure relief valve, so as to ensure the normal closure of the pressure relief valve and achieve the effect of decompression.
【作者單位】： 新疆水利水電規(guī)劃設(shè)計(jì)管理局;
【分類號(hào)】：TV672.2

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