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Calculation method of air volume and air pressure inside the straight-through shaft structure

A calculation method and shaft technology, applied in calculation, computer-aided design, design optimization/simulation, etc., to achieve the effect of simple method

Active Publication Date: 2019-02-12
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there is still no direct algorithm to estimate the air intake of the system

Method used

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  • Calculation method of air volume and air pressure inside the straight-through shaft structure
  • Calculation method of air volume and air pressure inside the straight-through shaft structure
  • Calculation method of air volume and air pressure inside the straight-through shaft structure

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Effect test

Embodiment 1

[0040] figure 1 It is a schematic diagram of the straight-through shaft structure device of this embodiment. The top of the shaft is sealed and air is brought in through an air inlet 6 with a diameter of 0.1 m. The water flows into the water passing section 8 of the vertical shaft through the water inlet pipe 7 with a diameter of 0.19 m, and then is discharged through the drain pipe 9. The diameters of the vertical shaft 8 and the drain pipe 9 are both 0.38m. The drop of water flow is from the bottom of the inlet pipe z=0m to the drain pipe z=7.72m.

[0041] In the calculation, the loss coefficient in formula (1) is 1.5. This result was obtained by fitting the experimental results. This example also knows the pressure P at the end of its drainpipe 3 = 0 Pa. Like this, simultaneous equation (1), (2) and (4), just can finish the calculation of air pressure value and suction capacity in this shaft structure. image 3 is a comparison between the estimated value of the shaft...

Embodiment 2

[0043] figure 2 It is a schematic diagram of the structure of this embodiment, which forms a wet pipe 11 and an air pipe 12 by adding a partition 10 to the vertical shaft of the first embodiment, leaving a small hole with a diameter of about 0.10m above the partition 10. The water flow flows through the side of the wet pipe 11, and the gas entrained downstream can be partially circulated from the air pipe 12 into the wet pipe 11 to form an internal circulating air flow. For such vertical shafts with circulating air flow, in addition to applying the formulas (1)-(4) in Example 1, the circulating air flow rate (5) should also be considered. In the formula (5), the resistance coefficient of the circulating air flow is determined as Kc=K through experiments t +K b , K b =20 is the loss coefficient when the circulating air flow passes through the bottom of the shaft, K t =1.23, which is the loss coefficient when the circulating air flow passes through the top hole. In this ca...

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Abstract

The invention discloses a method for calculating entrainment air quantity and intratubal air pressure of a direct-flow vertical shaft structure with a circulating air pipe in a sewerage system. A water fall structure is composed of a water incoming pipe, an air incoming pipe, a vertical pipe and a flow outgoing pipe, and three stages of changing of air pressure along with elevation in the verticalshaft structure include a water tongue blocking stage, a constant stage and a linear increasing stage. An applicable formula is put forward for the water tongue blocking stage, and constant elevationat the second stage is determined; pressure gradient of a linear increasing area is calculated to obtain a relation between pressure and air quantity at an air inlet. Other characteristic parameterslike vertical shaft air suction quantity can be obtained on the basis of any known upstream-downstream condition, and a reliable reference is provided for design a vertical shaft.

Description

technical field [0001] The invention relates to an algorithm for pipeline gas volume in the field of sewage discharge, in particular to a calculation method for the volume of gas volume in a direct-flow vertical shaft structure and the air pressure in a pipe. Background technique [0002] In the sewage / rainwater pipeline system, in order to transport the water flow from a high place to a low place, the drainage system is often provided with vertical wells or drop wells and other falling water structures. When the shaft structure flows, it is often accompanied by the entrainment of a large amount of external gas, which is brought into the downstream of the shaft and even the entire drainage pipe, and increases the internal pressure of the pipe. This has a certain impact on the normal and good operation of the system. The escaping odor also seriously affects the life of urban residents, which is not conducive to environmental construction and development. Therefore, it is ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/20G06F2113/14G06F2119/06
Inventor 魏佳芳张健俞晓东陈胜
Owner HOHAI UNIV