Electric heating effectively solves the problem of winter non-freezing of metro water pipes in the open air

Published on:

2022-10-14 10:30

In the non-freezing method of water supply and drainage pipelines in winter, traditional steam or hot water non-freezing is gradually replaced by flexible and reliable temperature controlled heating cables. The impact of the electric water pipe heating cable and operating costs are two important factors that investors should consider. This article uses a technical example to illustrate the freezing protection method of electric heating water pipes.

The pipeline layer of the Jinan Metro Second Line equipment contains the main pipes of the heat pipe network, the main pipes of the water pipe network, the fire protection pipe networks (including the garage sprinkler pipe network) and the main pipes of the sewer pipe network; pipe diameter DN25-DN300. To prevent freezing in winter of all types of pipelines, except for thermal ones, the construction team conducted experiments and came to the following conclusions:

The antifreeze scheme for water pipes, which uses only thermal insulation and treatment to preserve heat, has a greater risk;

The design and construction of an electric heating scheme using hot water or steam as a coolant is complex, and operation and management is difficult;

The antifreeze pouring scheme is not suitable for urban water and sewer pipes, and its application in the fire-fighting pipeline network is not very developed.

Therefore, in this project, a thermal insulation layer scheme plus a heating cable for temperature control is selected.

Temperature control heating cable: Use temperature control to control the temperature of the heating cable. Installation angle, heating cable length and heating power can be selected.

Each unit of heating cable in the thermal insulation layer plus a heating cable solution for temperature control includes a temperature controller, a temperature sensor, an air switch, and an isolation transmission of the AC overcurrent alarm. In working condition, the temperature sensor is placed on a heated chimney, and its temperature can be measured at any time. The thermostat compares the measured temperature with the temperature sensor according to the specified temperature, disables the transmission through the air switch in the control unit of the heating cable and the alarm over the AC limit, and disconnects and connects the power supply in time. To achieve the purpose of heating and antifreeze.

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