Heat-preservation greenhouse modeling method used for sewage treatment at northeast severe cod region

A technology for sewage treatment and thermal insulation greenhouses, which is applied in the fields of biological water/sewage treatment, water/sludge/sewage treatment, energy wastewater treatment, etc. It can solve the problems that sewage plants are difficult to operate stably and have low operating efficiency in winter, and achieve thermal insulation effect Excellent, good heat preservation effect, small temperature fluctuations between day and night

Inactive Publication Date: 2016-05-25
JILIN JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve the problems of difficult stable operation and low operating efficiency of sewage plants in northern cities in winter, and proposes a thermal insulation greenhouse modeling method for sewage treatment in severe cold regions in Northeast China

Method used

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  • Heat-preservation greenhouse modeling method used for sewage treatment at northeast severe cod region
  • Heat-preservation greenhouse modeling method used for sewage treatment at northeast severe cod region
  • Heat-preservation greenhouse modeling method used for sewage treatment at northeast severe cod region

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specific Embodiment approach 1

[0041] Embodiment 1: A method for modeling thermal insulation greenhouses for sewage treatment in severe cold areas in Northeast China includes the following steps:

[0042] Step 1: Determine the physical model, set the length of the aeration tank as L, the width of the aeration tank as B, the distance from the arch to the bottom of the aeration tank as H, the height of the aeration tank as h, the height of the arch as H-h, and the temperature of the sewage inlet as t i , the outlet temperature is t o , the air temperature in the greenhouse is t n , the ambient temperature is t w , the solar radiation intensity is q, and the shapes of the greenhouses are respectively arched and wedge-shaped;

[0043] Step 2: Import the physical model in Step 1 into Fluent software (Fluent software is existing software), and establish a mathematical model;

[0044] Step 3: According to the mathematical model established in step 2, determine the shape of the greenhouse as a wedge-shaped shed;...

specific Embodiment approach 2

[0072] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the mathematical model in described step 2, step 5, step 8 and step 11 is:

[0073] ∂ ρ ∂ τ + ∂ ( ρ u ) ∂ x + ∂ ( ρ v ) ∂ y + ∂ ( ρ w ) ∂ z = 0

[0074] d u d ...

specific Embodiment approach 3

[0115] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the specific process of selecting the shape of the greenhouse as a wedge-shaped shed in the step three is:

[0116] Through numerical simulation, monitor the air temperature in the greenhouse and the water temperature at the outlet of the aeration tank when different shapes of greenhouses are selected; When using a shaped shed, the air temperature in the shed is 275-280K, and the water temperature at the outlet of the aeration tank is 283.5-283.8K; the wedge-shaped shed is selected as the shape of the shed. When the wedge-shaped shed is selected, although the air temperature in the shed is lower than that of the arched shed, the outlet water temperature is higher. The main function of the greenhouse is to increase the water temperature in the aeration tank. Therefore, even if the air temperature in the shed is low, as long as the water temperature meets the requireme...

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Abstract

The invention relates to a heat-preservation greenhouse modeling method used for sewage treatment at the northeast severe cold region and is applied to the field of sewage treatment. The purpose is to solve the problems that in a north city, a sewage plant has difficulty in stable operation and is low in operation efficiency in winter. A greenhouse heat-preservation technology is adopted for intensifying operation of the sewage plant at low temperature in winter, and first a physical model is determined and imported into Fluent software to establish a mathematical model; through monitoring air temperature inside a greenhouse and the water temperature of an outlet in an aeration tank, the greenhouse is determined to be in a wedge shape, a greenhouse film is made of PO, the arch height of the greenhouse is 2.5 m, and the greenhouse film is provided with two layers; the temperature inside the greenhouse and the water temperature of the outlet in the aeration tank when air is not injected are compared with the temperature inside the greenhouse and the water temperature of the outlet in the aeration tank when air is injected, and therefore it is determined that recycled waste heat is utilized for increasing the temperature inside the greenhouse.

Description

technical field [0001] The invention relates to a modeling method for a thermal insulation greenhouse used for sewage treatment in severe cold areas in Northeast China. Background technique [0002] In northern my country, the winter temperature is low (the lowest temperature is -42.2°C) and the freezing period is long (up to 200 days in some areas). The sewage treatment plant is placed outdoors for long-term low-temperature operation, and the influent load fluctuates greatly, resulting in a decrease in effective biomass and biochemical The weakened metabolic activity makes it difficult for the sewage plant to operate stably, and the quality of the effluent water deteriorates, especially the content of nitrogen, phosphorus and organic matter exceeds the standard. In addition, due to the impact of low temperature, the physicochemical and biochemical effects are significantly reduced, it is difficult to effectively remove pollutants by traditional processes, and the operating e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50A01G9/14C02F3/30
CPCA01G9/14C02F3/308G06F30/13G06F30/23G06F30/367Y02A40/25Y02W10/37
Inventor 战乃岩徐沛巍徐玥邓玉峰
Owner JILIN JIANZHU UNIVERSITY
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