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A technology for pulverized coal burners and air ducts, which is applied in the direction of burners, burners for burning powder fuel, and combustion methods, etc. It can solve the problems of inability to effectively suppress NOx, poor concentration separation effect of pulverized coal airflow, and chaotic airflow field, etc. question
Inactive Publication Date: 2015-04-29
YANTAI LONGYUAN POWER TECH
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[0016] The purpose of the present invention is to propose a pulverized coal burner and a boiler equipped with the pulverized coal burner, which solves the problems in the prior art that the concentration separation effect of the pulverized coal air flow is poor, the concentration of ca
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[0066] Implementation mode 1:
[0067] like Figure 4 and Figure 5 As shown, the pulverized coal burner provided by the embodiment of the present invention includes a central air duct 56, a primary air duct 52, a secondary air duct ( Image 6 Shown is the inner secondary air cylinder) 53 and the dual-zone flow field generating structure arranged in the primary air cylinder 52 (the preferred embodiment of this structure will be described in detail below), wherein:
[0068] The secondary air cylinder 53 is sheathed outside the primary air cylinder 52 .
[0069] The primary air duct 52 is sleeved outside the central air duct 56 .
[0070]The double-zone flow field generation structure can make the pulverized coal concentration of the pulverized airflow sprayed out by the primary air duct 52 through the dual-zone flow field generation structure be distributed in a state of being thick on the outside and light on the inside. Form the first annular recirculation zone 72 between...
Example Embodiment
[0103] Implementation mode 2:
[0104] like Figure 6 ~ Figure 7 As shown, the pulverized coal burner provided in Embodiment 2 of this paper includes a central air duct 46, a primary air duct 42, a guide air duct 425, a block 421, and a guide device 424 that can adjust the rigidity or momentum of the pulverized coal airflow , the pulverized coal burner also includes a nozzle section 426, wherein:
[0105] The primary air duct 42 is sheathed outside the central air duct 46 .
[0106] The guide air cylinder 425 is located between the downstream section of the central air cylinder 46 and the downstream section of the primary air cylinder 42 .
[0107] The block 421 is fixed on the inner wall of the upstream section of the primary air cylinder 42, the flow guide device 424 is fixed on the outer wall of the central air cylinder 46, and the flow guide device 424 is located in the flow guide air cylinder 425, and the flow guide air cylinder 425 A nozzle section 426 is provided at ...
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Abstract
The invention discloses a pulverized coal burner and a boiler, which relate to a pulverized coal combustion technology, and solve the technical problem that NOx generation cannot be effectively restrained due to poor pulverized coal air flow dense-dilute separation effect and the like existing in the prior art. The pulverized coal burner comprises a central air duct, a primary air duct, a secondary air duct and a dual-section flow field generation structure arranged in the primary air duct, wherein the dual-section flow field generation structure can enable pulverized coal concentration of pulverized coal borne air flow which passes through the dual-section flow field generation structure and is ejected by the primary air duct to be distributed in a state of thick outside and diluted inside; a first annular recirculation zone is formed between the pulverized coal borne air flow with higher concentration and the pulverized coal borne air flow with lower concentration; a second annular recirculation zone is formed between the pulverized coal borne air flow with higher concentration and a secondary air flow ejected by an air flow channel formed between the secondary air duct and the primary air duct; a central recirculation zone is formed on a downstream region of the air flow with lower concentration. The boiler comprises the pulverized coal burner provided by the invention. According to the pulverized coal burner and the boiler provided by the invention, the generation of NOx can be more effectively restrained.
Description
technical field [0001] The invention relates to pulverized coal combustion technology, in particular to a pulverized coal burner and a boiler provided with the pulverized coal burner. Background technique [0002] The coal market fluctuates and the demand for power supply declines. Most power plants improve corporate efficiency by changing the coal-fired structure. At the same time, the change of the coal-fired structure, that is, the huge difference between the actual coal quality of the boiler and the original design coal quality, causes the flow field of the outlet of the burner to be chaotic, and it is difficult to meet a reasonable flow field, the combustion characteristics of the burner are reduced, and NOx emissions characteristics deteriorate. [0003] NOx is nitric oxide (NO) and nitrogen dioxide (NO 2 ) and other nitrogen oxides, which are mainly derived from fuel combustion products and are a major pollutant in the atmosphere. Among them, power plant boiler pul...
Claims
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