Low-resistance and low-NOx rotational flow coal powder burner with divergent segment

A technology of swirling pulverized coal and gradually expanding section, which is applied to burners, burners, combustion methods and other directions of burning powder fuels, can solve the problems of boilers unable to operate at full load, low concentration and thin separation efficiency, and reduced coal mill output.

Inactive Publication Date: 2011-01-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing cyclone pulverized coal burner has low density separation efficiency, the resistance of the primary air increases and reaches a certain value, which will lead to the reduction of the output of the coal mill and the failure of the boiler to operate at full load , and then provide a low-resistance, low-NOx swirl pulverized coal burner with a diverging section

Method used

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  • Low-resistance and low-NOx rotational flow coal powder burner with divergent segment
  • Low-resistance and low-NOx rotational flow coal powder burner with divergent segment
  • Low-resistance and low-NOx rotational flow coal powder burner with divergent segment

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specific Embodiment approach 1

[0006] Specific implementation mode one: combine figure 1 and figure 2 This embodiment is described. This embodiment includes a primary air duct, at least one frustum-shaped separating ring 3, an inner swirler 5, an inner secondary air duct 6 and an outer secondary air duct 7. The primary air duct consists of a primary The air duct inlet straight pipe section 1, the primary air duct gradual expansion section 2 and the primary air duct outlet straight pipe section 4 are composed of the air inlet end of the primary air duct gradual expansion section 2 and the air outlet end of the primary air duct inlet straight pipe section 1 Then, the air outlet end of the primary air duct gradual expansion section 2 is fixedly connected with the air inlet end of the primary air duct outlet straight pipe section 4, and the at least one frustum-shaped separation ring 3 is arranged in the primary air duct gradual expansion section 2, The small-diameter end of the frustum-shaped separation ring...

specific Embodiment approach 2

[0007] Specific implementation mode two: combination figure 1 To describe this embodiment, the included angle between the primary air channel diverging section 2 and the central axis of the primary air channel in this embodiment is α, 90°>α>0°. Such setting can ensure that a dense coal powder area is formed near the center of the air outlet section of the straight pipe section 4 at the outlet of the primary air duct, and a light coal powder area is formed near the pipe wall area, and more effectively ensures that the primary wind resistance is low. Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0008] Specific implementation mode three: combination figure 1 Describe this embodiment, the primary air duct inlet straight pipe section 1, the primary air duct gradual expansion section 2, the frustum-shaped separation ring 3, the primary air duct outlet straight pipe section 4, the inner secondary air duct 6 and the outer secondary air duct in this embodiment. Wind duct 7 is coaxially arranged. Such setting is beneficial to the passage of primary wind and secondary wind. Other compositions and connections are the same as those in Embodiment 1 or 2.

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Abstract

A low resistance and low NOx rotational flow pulverized coal burner with a diverging section relates to a rotational flow pulverized coal burner. The invention solves the problems that the existing rotational flow pulverized coal burner has low efficiency in the separation of the concentration and dilution, the power of a coal pulverizer is reduced when the resistance of primary air increases andreaches a certain value, and a boiler can not run at full load. A wind inlet end and a wind outlet end of the primary air channel diverging section of the rotational flow pulverized coal burner are respectively fixed and connected with a wind outlet end of a primary air channel entrance straight tube section and a wind inlet end of a primary air channel exit straight tube section, at least one frustum shaped separating ring is arranged inside the primary air channel diverging section, the minor diameter end of the frustum shaped separating ring is arranged towards the wind inlet end of a primary air channel exit straight tube section, the outer side of the primary air channel exit straight tube section is provided with an inner secondary air channel, and the outer side of the inner secondary air channel is provided with an outer secondary air channel. The rotational flow pulverized coal burner has high efficiency in the separation of the concentration and dilution and little resistance, improves the power of the coal pulverizer, ensures the boiler to run at full load, and reduces the discharge amount of NOx.

Description

technical field [0001] The invention relates to a swirl pulverized coal burner. Background technique [0002] Swirling pulverized coal burners occupy a certain proportion in power plant boilers and other pulverized coal applications in my country. The swirl pulverized coal burner relies on the high-temperature recirculation zone as a stable heat source, so that the pulverized coal airflow can ignite in time and burn stably. The primary and secondary air of the ordinary swirl pulverized coal burner is strongly mixed, the temperature peak is high, and the NOx generation is large. Nitrogen oxide (NOx) is the main source of air pollution. In addition to forming acid rain and destroying the ecological environment, it can also form photochemical smog, which is harmful to human health. Coal combustion is one of the main sources of NOx. In order to control the increasingly serious NOx pollution, the "Law of the People's Republic of China on Air Pollution Prevention and Control" imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23D1/02
Inventor 陈智超李争起赵洋刘春龙
Owner HARBIN INST OF TECH
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