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Adjustment method for steam turbine control valve flows in thermal power plant

A technology for thermal power plants and adjustment methods, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc., and can solve the problems that the unit adjustment performance cannot meet the power grid, sudden load changes, and slow adjustment, so as to facilitate coordinated control and prevent swings , improve the effect of linearization

Inactive Publication Date: 2014-03-26
GANSU DATANG INT LIANCHENG POWER GENERATION
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Problems solved by technology

At the same time, in the production process, after the steam turbine has been running for a period of time, or after the high-speed valve is disassembled and repaired, the flow characteristics of the valve will change, and there will be deviations from the original flow opening correction function of the valve, which is prone to load when the unit changes load and a frequency adjustment. Problems such as abrupt change or slow adjustment make the adjustment performance of the unit unable to meet the relevant technical requirements of the power grid

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  • Adjustment method for steam turbine control valve flows in thermal power plant
  • Adjustment method for steam turbine control valve flows in thermal power plant
  • Adjustment method for steam turbine control valve flows in thermal power plant

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Embodiment Construction

[0047] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0048] Based on a subcritical parameter of a thermal power plant, natural circulation, single furnace, one-time intermediate reheating, four-corner tangential combustion, balanced ventilation, solid-state slag discharge, full-suspension structure, metal rain cover on the furnace roof, and tight-fitting closed structure , "II" shape layout steam drum furnace as an example. The boiler can operate at constant pressure, or in a fixed-slip-fixed mode. The boiler can operate with base load or peak load. The pulverizing system adopts five HP-823 medium-speed mills, and the positive pressure direct blowing type pulverizing system of the cold primary fan. Four mills are normally in operation, and one mill is in standby. Under the condition of normal coal incomin...

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Abstract

The invention provides an adjustment method for steam turbine control valve flows in a thermal power plant. The adjustment method includes the following steps that step1, a control valve optimization experiment is performed, all experimental data are determined, and a load up-and-down experiment needing to be performed for a current valve curve linear relation, a high control valve flow characteristic experiment, and determining on maximum strokes and sequence valve curves of all high control valve equalizing valves, sequence valve curves after on-line inspection and modification and maximum flow point positions of intermediate control valves are sequentially performed; step2, a control valve flow curve optimization scheme is obtained through calculation and analysis performed on control valve flow curve experimental data. The adjustment method can effectively improve the flow characteristic of steam turbine control valves, improve load variation and primary frequency modulation performance of a generator set, effectively improve adjustment quality of the generator set, and improve running safety and service life of high control valves and the intermediate control valves and economy of the set.

Description

technical field [0001] The invention relates to the technical field of thermal energy and power engineering, in particular to a method for adjusting the flow rate of a steam turbine in a thermal power plant. Background technique [0002] With the continuous development of the electric power industry to the period of large capacity, high parameters and high automation, 300MW and 600MW thermal power units have become the main units of the power grid. The safe and stable operation of these large thermal power units directly affects the safe, stable and economical operation of the power grid. At present, the control method of large-scale thermal power generation units basically adopts the coordinated control based on boiler following, the purpose is to enable the generation units to quickly respond to the changes in dispatching AGC load instructions and the primary frequency regulation requirements of the power grid. The realization method is mainly that the main control comman...

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Application Information

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IPC IPC(8): F01D17/00
Inventor 孙奇李会军陈世炯李盛平卓响马有利黑金玉
Owner GANSU DATANG INT LIANCHENG POWER GENERATION
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