Design of production and heating boiler house

Introduction

The thermal diagram of the production and heating boiler house with an open heat supply system should be made taking into account its main feature related to the presence of water discharge on the WAN from heat networks. This leads to a significant increase in coolant losses and requires an increase in the efficiency of the boiler water treatment system.

Makeup water flow rate for compensation of coolant losses in open systems is significantly higher than in closed systems. A significant increase in make-up water flow rate, and hence an increase in water treatment capacity, makes it economically feasible to separately prepare feed water for steam boilers and heat network make-up water. In addition, the quality of makeup water is lower than the feedwater for steam boilers, which allows the use of the first stage of softening and thermal deaeration of water. But the use of network water for domestic purposes of the GVA imposes increased sanitary requirements on it.

When using network water for WAN purposes, the thermal point schemes of subscribers are simplified, since there is no heat transfer of the WAN.

The advantages of open systems include:

Possibility of reduction of design and production heat source when hot water storage tanks are installed in it.

Reduced metal consumption of local cold water supply networks.

Increase the service life of local distribution networks of WCS (since they supply water from heat networks that does not contain salts, stiffness and corrosive gases).

Disadvantages of open systems include the possibility of deterioration of the quality of disassembled for the purpose of the WAN, and the need for separate preparation of feed and make-up water.

The maximum temperature in the heat networks does not exceed 150 0C in the supply pipeline and 70 0C in the reverse.

To cover the process load, as a rule, water vapor with a pressure of up to 1.4 MPa is used.

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