Heating pipe drainage thermodynamic system and control method

Abstract

The invention relates to the technical field of thermodynamic systems, and discloses a heating pipe drainage thermodynamic system and a control method.The heating pipe drainage thermodynamic system comprises a first main steam pipe, a second main steam pipe, a first drainage branch line and a second drainage branch line; a second turn-off door and a second drain valve are sequentially arranged on the second drain branch line; each of the first shutoff door and the second shutoff door has a normally open state and a temporary closed state; each of the first drain valve and the second drain valve has a full-open state and a partial-open state; the drainage system further comprises a control unit, a balance pipe is connected between the first drainage branch line and the second drainage branch line, a temperature sensor is arranged on the balance pipe, and the control unit is used for receiving temperature signals and transmitting opening degree signals to all the drainage valves. The first drainage branch line, the second drainage branch line and the balance pipe meet the requirements of pipe heating, drainage and steam balance of the thermodynamic system at the same time, pipeline arrangement and valve arrangement are reduced, space is saved, and cost is reduced.

Description

technical field [0001] The invention relates to the technical field of thermal systems, in particular to a warm pipe draining thermal system and a control method. Background technique [0002] With the development of thermal power plants to large capacity and high parameters, the pipelines transporting steam medium have also formed a trend of larger specifications and thicker wall thicknesses. The wall thickness of some high-temperature pipelines has exceeded 110mm, and the pipelines have a large heat capacity , the pipeline needs more energy when starting and stopping, making it one of the main factors to consider the drainage and heating of the pipeline when the unit starts and stops. [0003] For the main steam system where the high pressure bypass acts as a safety valve, when considering the safety function, its layout is required to be placed on the boiler side, so that the section of the main steam pipeline from the high bypass inlet to the steam turbine inlet can only...

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Problems solved by technology

[0003] For the main steam system where the high-pressure bypass acts as a safety valve, its layout is required to be placed on the boiler side in consideration of safety, so that the section of the main steam pipeline from the high-side inlet to the turbine inlet can only be heated through the drain pipe, but Drainage pipes are mainly used to discharge condensed water, and there is no guarantee that the parameters of steam turbine steam can meet the demand for power generation in the later stages of this journey, so it is necessary to add another warm pipe; in addition, the main steam pipe of some projects adopts a double-pipe structure. In addition to drain pipes and heating pipes, balance pipes also need to be arranged. The number of pipes is large, and the space on the side of the main steam pipe is not enough. Therefore, the thermal system needs to comprehensively meet the needs of heating pipes, draining and steam balance.

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