Industrial steam supply system and method adapting to low load of thermal power generating unit

Abstract

The invention discloses an industrial steam supply system and method adapting to the low load of a thermal power generating unit. The industrial steam supply system comprises a high-pressure cylinder, a first-stage high-pressure heater and a heat exchange unit. One path of a first-section steam extraction opening of the high-pressure cylinder is connected with a steam-side inlet of the first-stage high-pressure heater and used for heating high-pressure feed water, and the other path of the first-section steam extraction opening of the high-pressure cylinder is connected with an industrial steam supply pipeline. A water-side outlet of the first-stage high-pressure heater is connected with the heat exchange unit, one path of an outlet of the heat exchange unit is connected with a boiler drum, and the other path of the outlet of the heat exchange unit is connected with an inlet of the heat exchange unit. A drain outlet of the first-stage high-pressure heater is connected with a next-stage high-pressure heater. When the industrial steam supply pressure of an original steam source cannot meet the requirements of a user at the low load of the unit, the steam intake amount of the first-stage high-pressure heater can be reduced, first-section extracted steam is supplemented to industrial steam supply to increase the industrial steam supply amount, and meanwhile the industrial steam supply amount is changed according to the requirements of actual conditions. The common problem that at present, the parameter regulation capacity of a combined intermediate valve is limited when the technologies of reheating hot section steam supply and the like are practically applied to the low load of the unit is solved, and the problem of contradiction between the deep peak regulation requirement of the coal power unit and the steam supply capacity guarantee is solved.

Description

technical field [0001] The invention belongs to the field of industrial steam supply, and relates to an industrial steam supply system and method adapted to the low load of thermal power units. Background technique [0002] With the massive grid-connected power generation of renewable energy such as wind, light and water, traditional thermal power is rapidly changing from the main energy source to the basic energy source, and it is urgent to undertake the task of ensuring the stable operation of the power grid, such as peak regulation, frequency regulation, and voltage regulation. With the upgrading and improvement of living standards, the demand for heat such as industrial steam and central heating is also increasing rapidly, resulting in a prominent contradiction between heat and power supply and demand. The traditional combined heat and power supply of thermal power units can no longer adapt to my country's rapid development and unbalanced heat and power demand, which has b...

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Problems solved by technology

The currently widely used steam supply technology for reheating hot section of Zoomlion Gate has certain limitations, and it is difficult to solve the contradiction between the deep peak regulation demand of coal-fired power units and the guarantee of steam supply capacity

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