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『Calculation formula for triangular weir flow』Related information(clamp on meter|electromagnetic meter|venturi meterrotameter|orifice meter|ultrasonic flow meter|mass flow meter|coriolis mass flow meter|coriolis flow meter|magnetic flow meter|magmeter flow meter|magflow flow meter|mag meter flow meter|electromagnetic flow meter|vortex flow meter|turbine flow meter|thermal mass flow meter|thermal flow meter|rotameter flow meter)
1. Introduction to sewage treatment engineering design (10) - Weir calculation
Introduction to sewage treatment engineering design (10) - Weir calculation is an important and detailed link in sewage treatment engineering design, which directly affects the effluent flow rate, water quality, and the efficiency of the entire treatment system. The following is a basic introduction to the calculation of weirs, including the types of outlet weirs, right angled triangular weirs, trapezoidal weirs, and calculation methods for perforated collection channels.
1. There are three common types of outflow weirs: triangular weirs, trapezoidal weirs, and rectangular weirs.
. There are also perforated water collection tanks (walls) that are submerged. Among them, triangular weirs are divided into two types: right angled triangular weirs and acute angled triangular weirs, while rectangular weirs are further divided into non submerged rectangular weirs and submerged rectangular weirs. This article focuses on the common non submerged triangular weirs, trapezoidal weirs, and submerged perforated collection walls in sedimentation tanks.2. Right angled triangular weir 1 The basic structure of a right angled triangular weir is mainly composed of two parts: the weir plate and the weir mouth, with a shape of a 90 ° triangle. The basic structure of a right angled triangular weir is composed of parameters such as the length of the weir mouth, the static distance between weir mouths, the reserved length at the end of the weir mouth, the height of the weir mouth (equal to 0.5 times the length of the weir mouth), the water depth passing through the weir, and the height of the weir plate. Calculation formula: When the water
(2) Calculation formula for the number of weirs n=Q/q (pieces), where Q is the design flow rate (m ³/s) and q is the flow rate of a single weir (m ³/s).
(3) The main verification parameter is the load q on the weir, and the calculation formula is q=0.5 · Q/(h · n) (L/(m · s)). For the initial sedimentation tank, the load on the weir should be ≤ 2.9 L/(m · s); For the secondary sedimentation tank, it should be ≤ 1.7 L/(m · s).
III. Trapezoidal Weir 1 The basic structure of a trapezoidal weir is suitable for large water volumes, and its structural dimensions are relatively fixed. The basic structure of a trapezoidal weir is composed of parameters such as the length of the weir mouth, the static distance between weir mouths, the reserved length at the end of the weir mouth, the height of the weir mouth, the width of the weir sill, the width of the weir surface, the depth of water passing through the weir, and the height of the weir plate. 2. Calculation formula: (1) Calculation formula for a single weir flow meter. The flow rate of a trapezoidal weir at a single weir mouth is q=1.86eh ^ 3/2 (m ³/s), where e is the width of the weir sill (m), h is the depth of water passing through the weir (m), and 1.86 is the flow coefficient (when the incoming flow velocity is greater t