Determination method of regenerative work ratio and regenerative gain rate of non-reheat unit with electric pump
A technology of non-reheat unit and recuperation work ratio, which is applied in the field of soft measurement, and can solve the problems of loss of cold source, recuperation work ratio, and failure of the calculation method of recuperation gain rate, etc.
Active Publication Date: 2018-04-10
SOUTHEAST UNIV
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Problems solved by technology
However, when the non-reheat unit has an electric pump, there is a loss of cold source in the heat recovery cycle corresponding to the electric motor driving the feed water pump, which leads to the failure of the calculation method of the heat recovery work ratio and heat recovery gain rate
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[0056] A method for measuring the regenerative work ratio and regenerative gain rate of a non-reheat unit with an electric pump, and its calculation model is aimed at a non-reheat unit with three-stage steam extraction and recuperation. The steam turbine consists of a cylinder, and its three-stage extraction steam is numbered as the first, second and third extraction steam in sequence, and is connected to the first, second and third heaters respectively. The heater is a surface heater, and its water discharges to the second-stage heater, the second-stage heater is a hybrid heater, and the third-stage heater is a surface heater, and its water discharges to the hot well of the condenser. The electric pump is driven by factory electricity to drive the water supply pump. The measurement steps are as follows,
[0057] Step 1: Calculation of steam-water parameters in thermal system
[0058] Step 1.1: Take the relative internal efficiency η of the steam turbine under THA (Turbine H...
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The invention discloses a method for measuring the heat recovery work ratio and the heat recovery gain rate when the non-reheat unit has an electric pump. The steam turbine of the non-reheat unit is composed of a cylinder, and its three-stage steam extraction is sequentially numbered as the first stage, The second and third stages extract steam and are connected to the first, second and third stage heaters respectively. The first stage heater is a surface heater, and its water discharges to the second stage heater. The tertiary heater is a surface heater, and its water is discharged to the hot well of the condenser. When the non-reheat unit has an electric pump, the determination steps of the regenerative work ratio and the regenerative gain rate are as follows: Obtain the non-reheat unit Equivalent regenerative steam flow work, equivalent condensate steam flow work and non-reheat non-reheat cycle without dimensionless heat rate when there is an electric pump; determine the regenerative work when the non-reheat unit has an electric pump Ratio and heat recovery gain rate. The measuring method of the invention can realize the high-precision and low-cost soft measurement of the regenerative work ratio and the regenerative gain rate when the non-reheating unit has an electric pump.
Description
technical field [0001] The invention relates to a method for measuring the regenerative work ratio and regenerative gain rate when a non-reheat unit has an electric pump, which can realize the measurement of the regenerative work ratio and regenerative gain rate when the non-reheat unit has an electric pump , belonging to the field of soft measurement. Background technique [0002] The heat recovery cycle composed of heaters is an important part of the non-reheat unit, and the heat recovery effect is one of the main factors affecting the thermal efficiency of the non-reheat unit. The main technical indicators for evaluating the heat recovery effect are heat recovery work ratio and heat recovery gain rate. Among them, the regenerative work ratio refers to the proportion of the work done by the regenerative steam flow in the internal work of the steam turbine (the sum of the work done by the regenerative steam flow and the work done by the condensing steam flow), and the rege...
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IPC IPC(8): G06F19/00
Inventor 王培红江承潮郝勇生赵佳骏孙文
Owner SOUTHEAST UNIV