Primary hot air heating system of secondary reheated fired coal power generation set

A technology of secondary reheating and generating sets, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems of increased resistance of the primary air system, overheating of steam temperature, etc., and achieve cascade utilization, flexible control, The effect of enlarging the suitable range of coal types

Pending Publication Date: 2020-10-09
XIAN THERMAL POWER RES INST CO LTD
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Problems solved by technology

However, when the primary air temperature is low and the output of the pulverizing system is to be ensured, it is necessary to increase

Method used

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  • Primary hot air heating system of secondary reheated fired coal power generation set

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Embodiment Construction

[0024] The present invention is described in further detail below in conjunction with embodiment.

[0025] Such as figure 1 Shown: a hot primary air heating system for a coal-fired power unit with double reheating, including a steam turbine two-stage steam extraction system, a steam turbine four-stage steam extraction system, a hot primary air heating system and a feed water heating system. in;

[0026] The second-stage steam extraction of the steam turbine is divided into two paths, which are respectively connected to the inlet of the external steam cooler 10A and the hot primary air heater 3A. No. 2 high-pressure heater 12 inlet; the four-stage steam extraction of the steam turbine is also divided into two routes, which are respectively connected with the inlet of another set of external steam cooler 10B and the hot primary air heater 3B, and pass through the external steam cooler 10B and the heat After the primary air heater 3B is merged, it is connected to the inlet of N...

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Abstract

The invention relates to a primary hot air heating system of a secondary reheated fired coal power generation set. The system comprises a second-stage extraction steam system of a steam turbine, wherein the second-stage extraction steam system of the steam turbine is connected to an external steam cooler and a primary hot air heater, separately, and extracted steam through the external steam cooler and the primary hot air heater is in joint connection to a second high pressure heater; four-stage extracted steam of the steam turbine is connected to the external steam cooler and the primary hotair heater, separately, and is in joint connection to a fourth high pressure heater through the external steam cooler and the primary hot air heater; a primary hot air inlet air duct is connected to an air pre-heater, and the primary hot air inlet air duct is connected to a primary hot air outlet air duct through two primary hot air heaters arranged in parallel; and a flow regulating valve on a water supply bypass of the external steam cooler can adjust the flow of water flowing through the external steam cooler. The system can improve the blending combustion proportion of a secondary reheatedfired coal boiler on high water and low heating value coal types, so that the variable load operating performance of the secondary reheating boiler is improved.

Description

technical field [0001] The invention relates to the technical field of coal-fired power generation, in particular to a secondary-reheat coal-fired generating set hot primary air heating system. Background technique [0002] At present, coal-fired generating units are still the main body of my country's power production and the basic guarantee for the long-term and stable development of my country's national economy. In recent years, double reheat technology has been gradually applied in the field of coal-fired power generation because of its cleanliness and high efficiency. However, in the thermal system of the double-reheat unit, the superheat of the extraction steam at each stage is relatively large, especially after the two-stage reheat, the superheat of the extraction steam is the largest, as high as about 300°C. In order to make full use of the superheat of the extraction steam and realize the cascaded utilization of the heat of the extraction steam, an external steam ...

Claims

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Application Information

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IPC IPC(8): F01K27/00F01K21/00F01K17/02F01K13/00F01K11/02F01D17/14F01D15/10
CPCF01D15/10F01D17/145F01K11/02F01K13/00F01K17/02F01K21/00F01K27/00
Inventor 乔永强李红智张旭伟张一帆白文刚杨玉韩万龙姚明宇
Owner XIAN THERMAL POWER RES INST CO LTD
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