Automatic control method for achieving optimal initial-pressure operation of heat-supply units

Abstract

The invention discloses an automatic control method for achieving optimal initial-pressure operation of heat-supply units. By modifying a coordinated control system, the method achieves optimal initial-pressure automatic control operation of heat-supply units under all operating conditions; according to the automatic control method, by real-time back pressures and real-time heat supplying, power variations corresponding to a standard operating condition are calculated and then subjected to addition operation with load commands, and after that, the operated power variations are used as new load commands of optimal initial-pressure functions, and initial-pressure values corresponding to the new load commands are calculated and output again. The method can achieve optimal initial-pressure automatic control operation of heat-supply units under all operating conditions. At the external conditions of spontaneous environment-temperature variations and requirement changes of heat consumers, the method can ensure that the units maintain operating around economic efficiency points. Because only the testing cost of field performance is involved, the method is low in investment cost, brings extremely considerable economic and environmental protection benefits to heat supply, industrial heat supply and units with both heat supply and industrial heat supply, and has a wide popularization effect.

Description

technical field [0001] The invention belongs to the technical field of energy and environmental protection, and in particular relates to an automatic control method for optimal initial pressure operation of a heating unit. Background technique [0002] With the development of my country's combined heat and power generation business, heating units are gradually becoming large-scale. Currently, heating units with a capacity of 300MW have become the main force. Some supercritical units with a capacity of 600MW have also begun to provide heat after transformation. And the economy has been greatly improved, representing the development direction of today's central heating. However, due to the complexity of the structure and system of large-scale heating units, some new problems have emerged, such as the safety of the heating system, the operation mode of the unit, and the economical operation of important auxiliary equipment, especially the unreasonable sliding pressure operation ...

AI Technical Summary

Problems solved by technology

However, due to the complexity of the structure and system of large-scale heating units, some new problems have emerged, such as the safety of the heating system, the operation mode of the unit, and the economical operation of important auxiliary equipment, especially the unreasonable sliding pressure operation mode. That is to say, the heating unit basically still uses the sliding pressure operation mode of the original pure condensing condition

As the unit deviates from the economic initial pressure operation for a long time, the coal consumption increases, and at the same time, the load response rate decreases, and there may be vibration of the steam turbine unit, hidden dangers in the operation of auxiliary equipment, etc., which seriously affect the safety and economy of the unit operation

[0003] At present, the research technology on the optimization of unit sliding pressure operation is relatively mature, but the research scope is limited to the pure condensing condition, which is mainly due to the following reasons: (1) The heat supply is limited by the heating user demand, and the operation safety of the steam turbine unit must be considered , the heat supply adjustment range is narrow; (2) The heating steam volume is not easy to measure, and the field is often based on the measurement of the drain flow, while most power plant flow measurement devices have poor stability and low precision, and quantitative analysis is difficult; ( 3) Due to the alternating influence and change of the three parameters of power, main steam flow, and heat supply, the conventional test method of sequentially changing a single parameter will increase the workload, and the stability between the system and other parameters will affect the test. accuracy of results

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