Intelligent energy-saving mixed water heat supply method

Abstract

The invention relates a mixed water heat supply system, in particular to an intelligent energy-saving mixed water heat supply method. In the invention, developed from a system adopting the conventional valve throttling distribution, a corresponding intelligent energy-saving mixed water heat supply system consists of a mixed water station intelligent balance monitoring subsystem, a computer centralized monitoring center, a video monitoring subsystem and a secondary network intelligent balance and energy-conservation monitoring subsystem; and the operation optimization and energy conservation of the entire mixed water heat supply system are realized by the excellent cooperation of the four subsystems.

Description

technical field [0001] The invention relates to a mixed water heating system, in particular to an intelligent energy-saving mixed water heating method. Background technique [0002] The current central heating system can be divided into three forms: direct heat supply, indirect heating and mixed water heating. The characteristic of indirect heating is that the primary network and the secondary network with different pressure characteristics are separated through the plate heat exchanger. During the operation, the two do not interfere with each other, and it is easy to realize management control and stable operation. However, the indirect heating method inherently has the following limitations: 1) The heat transfer depends on the efficiency of the plate heat exchanger, which is difficult to guarantee in actual operation due to fouling and other reasons. At the same time, the resistance of the secondary network operation will increase with the deterioration of the heat exchan...

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Problems solved by technology

However, the indirect heating method inherently has the following limitations: 1) The heat transfer depends on the efficiency of the plate heat exchanger, which is difficult to guarantee in actual operation due to fouling and other reasons

At the same time, the resistance of the secondary network operation will increase with the deterioration of the heat exchanger fouling

2) For the primary network, due to the requirements of safety design and safe operation, the operation mode of large flow and small temperature difference is adopted, resulting in high energy consumption in operation, and making it difficult to adapt to the operating conditions of continuous increase in the heating area of ​​end users ; 3) Under the existing operation mode, cogeneration of heat and power must be fully realized in order to make full use of the waste heat of the power plant and improve the thermal efficiency of the power plant

However, its structural characteristics also cause inherent defects in the mixed water heating system: 1) The direct coupling between the primary network and the secondary network causes the fluctuation of the primary network to directly affect the stability of the secondary network operation, that is to say, the system As a result, the difficulty of operation control will increase sharply, which is the most direct reason for the difficulty in promoting the system; 2) The return water pressure of the primary network is relatively high. While ensuring the resistance of the user, the return water pressure head needs to provide a pressure difference for the development of mixed water, causing the secondary return water pressure to be higher than the primary water supply pressure. Intuitively, this part of energy will eventually be partially wasted to maintain the balance of the primary return water In terms of throttling, it may also cause an increase in the pressure resistance of the primary network pipes

[0004] Although indirect heating and mixed water heating are different in characteristics, they have common problems in the process of system design and selection: 1) Redundant mode of safe design and safe operation, operating conditions and design working conditions The long-term and huge differences between the conditions have caused the limitations of both systems to be overkill, and most of the systems operate in a low-efficiency state; 2) The traditional operation mode of primary pump pressurization pipeline network transmission and distribution, as well as changes in operating conditions The continuity of the system makes the hydraulic characteristics of the operating conditions of the system complex, and it is difficult to achieve dynamic hydraulic balance on the set pipe network

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