Example of outdoor heating pipe network system setting when the topography is very different: a plant is a large-scale petrochemical plant, and a large amount of waste heat is generated from the oil refining device. In order to achieve energy recovery, the heat required for heating and domestic water is in principle the waste heat of the production device. The company is located on a hillside. Due to geographical constraints, the terrain is complex, the topography is very different, and the north-south height difference is 40 meters. The pipe network layout is very difficult. For unified management, the hot water station is located in the installation area at the highest point of the plant. At an altitude of 7 meters, there are two 75-meter high-rise apartments at an altitude of 40 meters in the north. The plant's approach is not to isolate the high-rise. To use the same system with other users, in order to meet the stability of the high-level water supply, and can overcome the resistance of the pipeline network at one time, the hot water station used high-lift pumps. The users in the lower part of the north of the network will be under high pressure. Exceeds the pressure-bearing energy of cooling equipment. Heating pipelines and equipment are under high pressure for a long time, which shortens the life span and increases the incomplete factor.
In view of the actual situation of the disparity in height difference, it is recommended to make the following changes: reduce the head of the circulating pump of the hot water station to meet the needs of most users except high-rises. The high-rise water supply is equipped with pipeline pressure pumps, so that the operating point of the pump matches the characteristics of the pipeline , This basically meets the pressure capacity of other user equipment (most of the unit radiators use high-pressure cast iron radiators).
In situations where the topography is very different, if you do not want to use high-pressure heat dissipation equipment to avoid excessive investment, in addition to high-rise isolation, you can also set up a pressurized water pump on the return water line to reduce the pressure capacity of the heat dissipation equipment and cut the network according to the terrain Maintain different hydrostatic pressure lines for two different areas. When the pump is shut down, the pressure of the return water pipe rises. When the pressure reaches the low pressure hydrostatic pressure line, the water supply line is automatically closed, and the check valve and the return water line stop The valve divides the network into two, and the low-pressure area is not affected by the high-pressure area. The high-pressure hydrostatic pressure line is maintained by the system make-up water, and the low-pressure hydrostatic pressure line is maintained by the pressure reduction of the throttle regulating valve.
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