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Full-load efficient backheating and fire coal drying system

A drying system, full-load technology, applied in the direction of drying gas layout, preheating, drying, etc., can solve the problems of coal pulverized coal outlet temperature not reaching the design value, poor boiler combustion, and increased extraction steam temperature.

Active Publication Date: 2012-09-19
CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the simple full-load high-efficiency recuperation system still has the following shortcomings: (1) Due to the sliding pressure operation of the unit at part load, the extraction steam pressure is reduced, but the extraction steam temperature does not drop or drops very little, so at part load Switching the extraction steam of the lower heater to a high-pressure steam source may lead to an increase in the extraction steam temperature, so it is necessary to increase the material grade of the heater to meet the increase in the extraction steam temperature, which increases the cost of the heater; or take measures to reduce the extraction steam (such as spraying water to reduce temperature), wasting the heat of steam extraction; (2) due to the limitation of boiler structure and hydrodynamic conditions, there is an upper limit for the increase of feed water temperature
When the moisture content of the coal is much higher than the design coal type, it will happen that the pulverized coal cannot be completely dried even if the inlet air temperature of the pulverizer reaches the upper limit, that is, the pulverized coal temperature at the outlet of the pulverizer cannot reach the design value
This situation will lead to poor boiler combustion and reduced boiler efficiency

Method used

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  • Full-load efficient backheating and fire coal drying system
  • Full-load efficient backheating and fire coal drying system
  • Full-load efficient backheating and fire coal drying system

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Embodiment Construction

[0030] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0031] image 3 A schematic framework of a full-load high-efficiency heat recovery and coal-fired drying system according to the present invention is shown. like image 3 As shown, the full-load high-efficiency heat recovery and coal-fired drying system of the present invention mainly includes: cascaded multiple heaters 301-303, at least one high-load steam source 304, at least one low-load steam source 305, and coal-fired drying equipment 306. especially in image 3 Among them, the above-mentioned multiple heaters are successively condensed water heater 301, deaerator 302 and feed water heater 303, and correspondingly have three optional high-load steam sources 304, three optional low-load steam sources 305, and three optional low-load steam sources 305. A set of corresponding coal-fired drying equipment 306 is provided. Of course, the present inventio...

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Abstract

The invention provides a full-load efficient backheating and fire coal drying system which comprises a plurality of heaters, at least one high-load steam source, at least one low-load steam source and fire coal drying devices. The heaters are in cascade connection; each high-load steam source is selectively communicated with one of the heaters; each low-load steam source is selectively communicated with one of the heaters; and each fire coal drying device is arranged between the corresponding low-load steam source and the heater connected with the low-load steam source or between the corresponding high-load steam source and the heater connected with the high-load steam source, and the pressure of the low-load steam sources is higher than that of the high-load steam sources. The full-load efficient backheating and fire coal drying system can increase efficiency of a generator set under particle load, and the temperature of air of an inlet of a coal mill is increased so as to increase pulverized coal drying capacity of the coal mill.

Description

technical field [0001] The invention relates to the technical field of power generation, in particular to a full-load high-efficiency heat recovery and coal-fired drying system suitable for power plants. Background technique [0002] In a power plant, a regenerative system is a system that uses steam to heat condensate and feedwater. The system can recover all the heat of the steam to the working water to improve the thermodynamic cycle efficiency. The heaters of the regenerative system mainly include condensate heaters, deaerators and feed water heaters. In the application, the heat of the multi-stage extraction steam of the steam turbine is usually used in the configuration of the regenerative system to heat the condensed water and the feed water through the multi-stage heater, so as to recover all the heat of the steam into the working water and increase the temperature of the feed water. The system design of current power plants focuses on the efficiency of the generat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F22D1/32F26B21/00
CPCY02P70/10
Inventor 申松林叶勇健林磊施刚夜
Owner CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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