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Combustion control method and system for lignite-fired unit

A technology of control system and control method, applied in the direction of combustion method, control combustion, lighting and heating equipment, etc., to achieve the effect of reducing power consumption, reducing resistance, and reducing usage

Active Publication Date: 2011-07-06
NORTH CHINA ELECTRICAL POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of the primary air volume in the prior art, the present invention provides a combustion control method and system for a lignite unit

Method used

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  • Combustion control method and system for lignite-fired unit
  • Combustion control method and system for lignite-fired unit
  • Combustion control method and system for lignite-fired unit

Examples

Experimental program
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Embodiment 2

[0032] image 3 It is a schematic diagram of the combustion control system of the lignite unit provided by the present invention. The system includes: boiler 305, coal mill 304, air preheater 306, dust collector 307, induced draft fan 301, primary fan 303, secondary fan 302 and chimney 308; among them, coal mill 304 is connected to boiler 305 primary fan Between the outlets of 303, the outlet of the secondary fan 302 is connected to the boiler 305, and the air preheating between the flue gas pipe, the secondary air pipe and the primary air pipe is realized in the air preheater 306. The dust collector 307 is connected to the smoke of the air preheater. Between the air duct and the inlet of the induced draft fan 301, the outlet of the induced draft fan is connected to the chimney 308.

[0033] The system also includes: a flue gas regulating device 309;

[0034] The flue gas adjusting device 309 is connected between the outlet of the induced draft fan 301 and the inlet of the primary...

Embodiment 3

[0045] Figure 5 It is a schematic diagram of the combustion control system of the lignite unit provided by the present invention. The system includes: boiler 505, coal mill 504, air preheater 506, dust collector 507, induced draft fan 501, primary fan 503, secondary fan 502 and chimney 508; among them, coal mill 504 is connected to boiler 505 primary fan Between the outlets of 503, the outlet of the secondary fan 502 is connected to the boiler 505, and the air preheating between the flue gas pipe, the secondary air pipe and the primary air pipe is realized in the air preheater 506. The dust collector 507 is connected to the smoke of the air preheater. Between the air duct and the inlet of the induced draft fan 501, the outlet of the induced draft fan is connected to the chimney 508.

[0046] The system also includes: a flue gas adjusting device 509;

[0047] The flue gas adjusting device 509 is connected between the outlet of the induced draft fan 501 and the inlet of the primary...

Embodiment 4

[0079] Figure 7 The schematic diagram of the combustion control method of the lignite unit provided by the present invention. The method includes:

[0080] S701: Feed back the flue gas sent from the outlet of the induced draft fan to the inlet of the primary fan;

[0081] S702: The primary fan mixes the feedback flue gas with the air sent from the outside, and sends the mixed gas to the boiler through the air preheater and the coal mill to burn the lignite.

[0082] In order to explain the method provided in the embodiment of the present invention in more detail. Here, please see Figure 5 The combustion control system of the lignite unit provided. In this embodiment, since the flue gas fed back from the induced draft fan 501 has a certain amount of heat, the flue gas fed back from the induced draft fan 501 is mixed with the air sent from the outside to obtain a mixed gas. Compared with the prior art using only air as the desiccant, this example uses the mixed gas as the desiccan...

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Abstract

The invention provides a combustion control method and a system for a lignite-fired unit, and the method comprises the following steps: feeding back flue gas sent out from an outlet of an induced draft fan to an inlet of a primary air fan; and using the primary air fan to mix the fed back flue gas with air sent in from outside, and sending the mixed gas into a boiler for the combustion of lignitethrough an air preheater and a coal pulverizer. By adopting the technical scheme, a flue gas regulating device is connected between the outlet of the induced draft fan and the inlet of the primary air fan through a flue, and a certain amount of the flue gas is doped into primary air, thereby not only reducing the using amount of the primary air of a boiler and controlling NOx within a qualified range, but also reducing the resistance of a primary air pipeline due to the elimination of a primary air heater and reducing power consumption of the primary air fan.

Description

Technical field [0001] The present invention relates to the technical field of lignite combustion, in particular, to a combustion control method and system of a lignite unit. Background technique [0002] Lignite is the coal with the shallowest degree of coal mining, accounting for about 12% of the country's coal reserves, and will surely become the main source of energy in my country. However, because of its high moisture content, a large amount of primary air is required during combustion, which makes the amount of primary air input to the boiler large, and NO x (Nitrogen oxide) is difficult to control, and at the same time the exhaust smoke loss is large, and the boiler efficiency is very low. [0003] Such as figure 1 Shown is a schematic diagram of the combustion control system of a lignite unit provided by the prior art. The coal mill 104 is connected between the outlet of the primary fan 103 of the boiler 105, and the outlet of the secondary fan 102 is connected to the boil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23N3/00
CPCY02E20/34
Inventor 赵振宁张清峰
Owner NORTH CHINA ELECTRICAL POWER RES INST