Flow and pressure combined control system and method for multiple cold and reheat supply units

Abstract

The invention relates to a flow and pressure combined control system and method for multiple cold and reheat supply units. The system comprises a first unit, a second unit, a third unit, a heat supply mother pipe, a heat supply mother pipe pressure setting module, a heat supply mother pipe flow demand calculation module, a multi-unit actual generation power acquisition module, a multi-unit flow scheduling module, an amplitude and speed limiting module, a deviation calculation module and a PID control module. Through combined operation of flow adjustment of the two units and pressure adjustment of one unit, on one hand, heat supply mother pipe flow demand estimation calculation and real-time adjustment are achieved, so that flow adjustment economic performance real-time calculation is conducted according to the current unit electric load condition, heat load dynamic distribution of the two heat supply units is achieved, and the heat supply efficiency is improved. Therefore, the purposes of energy conservation and emission reduction are achieved; on the other hand, the problem of pressure fluctuation caused in the flow adjusting process can be solved through single pressure adjustment, and the steam parameter quality of steam enterprises is guaranteed. Therefore, excellent plant-level joint scheduling is realized.

Description

technical field [0001] The invention relates to the field of energy distribution, in particular to a combined flow and pressure control system and method for multiple cooling and reheating units. Background technique [0002] With the rapid development of my country's economy, the demand for energy is becoming more and more strong, and the shortage of energy will seriously restrict the development of my country's economy. On the one hand, the heating unit needs to meet the electricity demand of enterprises and residents, and on the other hand, it needs to meet the steam demand of industrial production enterprises. Therefore, there is still a lot of room for the energy-saving optimization control of the heating unit. [0003] In recent years, plant-level load scheduling has provided new ideas for energy-saving optimization of heating units. Thermal power plants are responsible for the heat load demand of a certain area. There are many constraints on safety protection and pro...

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Problems solved by technology

[0004] In current engineering practice, in order to ensure the steam temperature and pressure demand on the user side, the unit mostly adopts pressure control, but due to the characteristics of large inertia and large delay of the heating pipeline, the actual flow demand of the user and the steam supply flow of the plant side are not real-time Balanced, the difference in flow is large; on the other hand, the pressure control cannot realize the adjustment of the heating flow of a single unit, the control is relatively extensive, and the plant-level heating cannot achieve the purpose of energy saving

[0005] The heat supply of the unit adopts flow control. Due to the network security requirements of the power plant, the heat user demand data on the unit side cannot be transmitted to the DCS closed-loop acquisition, so that in the actual operation of the heating unit, the heat supply of a single unit is often dispatched through the telephone based on personnel experience, although the heat supply can be realized. adjustment, but there is no specific economic evaluation index, and the personnel adjustment cannot be optimized in real time with the change of electrical load; Tube steam parameters are unstable

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