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Unpowered multi-channel flue gas heating device and method

A flue gas heating, multi-channel technology, applied in the field of thermal power plant equipment, can solve the problems of increased coal consumption, low inlet flue temperature of low-load denitration, insufficient drying capacity of pulverizing system, etc., so as to improve boiler combustion efficiency and meet deep peak regulation. Effect

Pending Publication Date: 2021-02-12
XIAN THERMAL POWER RES INST CO LTD
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  • Abstract
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Problems solved by technology

[0008] The purpose of the present invention is to provide a non-powered multi-channel flue gas heating device and method, which are used to solve the defects of low-load denitrification inlet flue temperature, insufficient drying capacity of the pulverizing system, and increased coal consumption existing in existing coal-fired units.

Method used

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  • Unpowered multi-channel flue gas heating device and method
  • Unpowered multi-channel flue gas heating device and method
  • Unpowered multi-channel flue gas heating device and method

Examples

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Effect test

Embodiment 1

[0047] The test unit is a 350MW unit boiler in Fuxin Power Plant. The flue width of the SCR reactor is 12m, using 4 circular pipes and 4-point mixing technology. The preferred choice is about 500mm behind the high temperature superheater in the horizontal flue. The distance between adjacent mixing points is about 2.4m, and the material is 12cr1MoV. The insertion point is at the front end of the horizontal flue of the SCR reactor, which is also the highest point of the flue gas space of the SCR reactor. Since there is no heating surface at the insertion point, the pipe is inserted at 45° to a depth of about 250mm and sealed. Install shut-off door and adjustment door 2 door control, choose heat-resistant material. The extraction point is selected after the high-temperature superheater in the horizontal flue, the extraction point smoke temperature is 500℃~600℃, and the negative pressure is 150Pa~200Pa. The insertion point is at the highest point of the SCR reactor, where the ne...

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Abstract

The invention provides an unpowered multi-channel flue gas heating device and method. The unpowered multi-channel flue gas heating device comprises a flue gas extraction port and an insertion port, wherein the flue gas extraction port is formed in a side enclosure wall on a horizontal flue and is formed in the position at the downstream of a high-temperature superheater, the insertion port is formed in the front end of a horizontal flue of a SCR reactor; and the flue gas extraction port is connected to the insertion port through a connecting pipe. According to the unpowered multi-channel fluegas heating device and method, the device can to be put into use at any time by adjusting a valve according to load requirements, the valve is closed under high load, leakage is avoided in the closingprocess, jamming is avoided in the opening process, after the device is put into use, the SCR inlet flue gas temperature can be increased by 50 DEG C, and the hot primary air temperature can be increased by 30 DEG C. and remarkable effects of meeting the requirements of deep peak regulation of a large thermal power generating unit and the drying capacity of a coal pulverizing system at medium andlow load stages and improving the boiler combustion efficiency can be achieved.

Description

technical field [0001] The invention belongs to the field of thermal power plant equipment, and in particular relates to a non-powered multi-channel flue gas heating device and method. Background technique [0002] At present, efforts are being made to optimize the structure and layout of power sources, accelerate clean substitution on the supply side, and vigorously develop clean energy such as wind and solar; strictly control the total amount of coal power, optimize the layout of coal power, and change the positioning of coal power; vigorously promote the transformation of coal power flexibility and accelerate pumped storage construction of flexible power sources and the application of new energy storage technologies. [0003] The proportion of coal power installed capacity and power generation continued to decline. The proportion of national coal power installed capacity dropped from 59% to 50.7%, and the proportion of power generation decreased from 67.9% to 61.5%, down...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/08
CPCF23J15/08
Inventor 吴景兴张安文吕中琪
Owner XIAN THERMAL POWER RES INST CO LTD
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