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Pulverized coal flameless combustion system and method

A flameless combustion, pulverized coal technology, applied in the field of combustion, can solve the problems of easy wear of nozzles, complex system, high energy consumption of high-pressure fans, achieve simple system, reduce fan head and power consumption, and flameless combustion method of pulverized coal reliable results

Inactive Publication Date: 2019-10-08
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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  • Claims
  • Application Information

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Problems solved by technology

Although this method can achieve flameless combustion of pulverized coal, the whole system is complex, the high-pressure fan consumes a lot of energy, and the nozzle of the high-speed injection is easy to wear

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  • Pulverized coal flameless combustion system and method
  • Pulverized coal flameless combustion system and method
  • Pulverized coal flameless combustion system and method

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Embodiment Construction

[0039] The disclosure provides a pulverized coal flameless combustion system and method, which adopts the method of preheating fuel and graded air distribution, and disperses the secondary air and tertiary air into the furnace to ensure that the oxygen content in the reaction zone in the furnace is lower than 10 % or lower, after the pulverized coal combustion is stable, the flame front disappears, showing uniform flameless combustion, which can reduce the injection speed of the secondary air, so that the injection speed of the secondary air is between 20 and 50m / s, and the pressure head of the fan can be reduced and power consumption.

[0040] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0041] As an embodiment of the present disclosure, a pulverized coal flameless co...

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Abstract

The invention provides a pulverized coal flameless combustion system and method. The system comprises a hearth body and a pulverized coal preheater, wherein the hearth body comprises a pulverized coalflameless burner arranged at the bottom of the hearth body and tertiary air nozzles which are divided into at least two layers in the axial direction of the hearth body and arranged on the side wallof the hearth body, the pulverized coal flameless burner comprises a preheating fuel nozzle and a plurality of secondary air nozzles, and the pulverized coal preheater is connected to the preheating fuel nozzle and used for preheating pulverized coal and conveying the preheated pulverized coal to the pulverized coal flameless burner. The invention further provides the pulverized coal flameless combustion method using the system. By means of preheating fuel and grading air distribution, uniform flameless combustion is realized, the secondary air injection speed can be reduced, and fan pressurehead and power consumption can be reduced.

Description

technical field [0001] The present disclosure relates to the field of combustion technology, in particular to a pulverized coal flameless combustion system and method. Background technique [0002] Flameless combustion technology is a new type of low NO X Combustion technology, in flameless combustion, the temperature distribution in the combustion area is uniform and the peak temperature is low, there is no obvious flame front, the temperature field is uniform, and there is no obvious peak temperature, but the average temperature in the furnace is increased and the radiation efficiency is high. Compared with conventional combustion, the thermal efficiency of flameless combustion can be increased by 30%, while NO 963. Emissions can be reduced by 70%. Flameless combustion is also called high-temperature low-oxygen combustion. To achieve flameless combustion, the following conditions generally need to be met: 1) The oxidant is preheated to a certain high temperature before t...

Claims

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Application Information

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IPC IPC(8): F23D1/00F23L9/00F23K1/04
CPCF23D1/00F23K1/04F23L9/00Y02E20/34
Inventor 欧阳子区李诗媛朱建国
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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