Quick starting system and method for thermal generator set in intermediate pressure cylinder starting mode

Abstract

The invention discloses a quick starting system and method for a thermal generator set in an intermediate pressure cylinder starting mode. The quick starting system comprises a superheater, an intermediate pressure cylinder and a starting steam header, wherein one steam exhaust path of the superheater enters a high pressure cylinder, and the other steam exhaust path enters a high exhaust check valve rear pipeline through a high pressure bypass valve; exhaust steam of the intermediate pressure cylinder enters a low pressure cylinder for acting and enters a condenser, and a condensate water outlet of the condenser is connected with a local condensate water system and an adjacent condenser through a condensate pump; one steam exhaust path of the starting steam header enters the high pressure cylinder for heating, and the other steam exhaust path enters the intermediate pressure cylinder for acting; and incoming steam of an adjacent machine is connected with a desuperheating water and the starting steam header through a pressure and temperature reducing device and the like. According to the quick starting system and method, the starting process of the thermal generator set in the intermediate pressure cylinder starting mode is converted from a cold state starting mode to a warm state starting mode. A boiler and steam turbine series connection mode is changed into a parallel connection mode in the starting process of the thermal generator set in the intermediate pressure cylinder starting mode, the starting time can be shortened, the starting cost is reduced, and the set can meet the power grid response requirement more quickly.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and relates to a quick start system and method for a thermal power generating set in a medium-pressure cylinder starting mode. Background technique [0002] With the increase of the proportion of clean energy with limited peak-shaving capacity such as wind power and solar energy in the power structure, the demand for peak-shaving power grid and the difficulty of peak-shaving further increase, and the utilization hours of coal-fired units have decreased year by year in recent years. The number of unit start-ups and shutdowns caused by them is increasing year by year. [0003] Taking the cold-state start-up process of the unit produced by a certain steam turbine factory using the medium-pressure cylinder start-up method as an example, the main steps are as follows: (1) Cleaning the system in cold state; (2) Putting on the shaft seal and vacuuming. (3) Boiler purging, ignition, hot...

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Problems solved by technology

The start-up time is long, and the cost of coal, steam, plant power consumption and environmental protection emissions generated during the start-up process is relatively high, and it is also difficult to meet the needs of the grid for rapid response to coal-fired units

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