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Pre-mixed grading combustion method and device

A staged combustion and premixing technology, applied in the field of boilers, can solve the problems of reducing NOx emissions and insufficient secondary combustion of high-temperature flue gas, and achieve the effects of reducing NOx synthesis, improving heat utilization efficiency, and reducing combustion temperature

Pending Publication Date: 2019-04-16
浙江力巨热能设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a premixed staged combustion method and device to solve the problems in the prior art that the high-temperature flue gas produced by oxygen-enriched combustion cannot be fully combusted and the NOx emission cannot be reduced to the greatest extent.

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  • Pre-mixed grading combustion method and device
  • Pre-mixed grading combustion method and device
  • Pre-mixed grading combustion method and device

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Embodiment 1

[0031] This embodiment provides a premixed staged combustion method, which includes the following steps: S1, controlling the air excess coefficient of the premixed gas A to 1.3 to 1.7, so that the premixed gas A is combusted under oxygen-enriched conditions to form flue gas A' ; The air excess coefficient of the premixed gas B is controlled to be 1 to 1.02, so that the premixed gas B is burned under oxygen-poor conditions to form flue gas B'; S2, flue gas A' and flue gas B' are pre-fired in the primary combustion chamber After mixing evenly through the throttling parts, it enters the secondary combustion chamber, where secondary combustion occurs, and finally the combustion is complete.

[0032] The premixed gas is mixed with gas and air into the required ratio and then passed into the combustion chamber. The premixed gas can reduce the NO in the flue gas X . The combustion speed of the premixed gas is fast, the flame length is short, and the combustion is intense, so the siz...

Embodiment 2

[0037] like Figure 1-3 As shown, this embodiment provides a premixed staged combustion device, including a burner and a combustion chamber. The burner includes a first burner 11 and a second burner 12 . The first burner 11 and the second burner 12 are both premixed burners. The premixed gas composed of gas and air is mixed in the first burner 11 and the second burner 12 respectively to the required ratio. The premixed gas Can reduce NO in flue gas X . The premixed gas has fast combustion speed, short flame length and intense combustion, so it can reduce the size of the combustion chamber and improve the safety performance of the boiler. The combustion chamber includes a primary combustion chamber 21 and a secondary combustion chamber 22 . The combustion ends of the first burner 11 and the second burner 12 are located in the primary combustion chamber 21 . A throttling component 3 is also provided in the combustion chamber, and the throttling component 3 is located betwee...

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Abstract

The invention relates to a combustion method and a combustion device, in particular to a water-cooled premixed grading combustion method and device. The method comprises the following steps that 1, the air excess coefficient of the premixed gas A is controlled at 1.3-1.7, so that the premixed gas A is combusted under oxygen-rich conditions to form the flue gas A', and the air excess coefficient ofthe premixed gas B is controlled at 1-1.02, so that premixed gas B is combusted under the condition of poor oxygen to form the flue gas B'; and 2, the flue gas A' and flue gas B' are premixed in a primary combustion chamber, evenly mixed through a throttling part and enter a secondary combustion chamber, and secondary combustion is conducted in the secondary combustion chamber. The water-cooled premixed grading combustion device includes a first combustion machine, and a second combustion machine, the combustion chamber includes the primary combustion chamber and the secondary combustion chamber, the throttling part is located between the primary combustion chamber and the secondary combustion chamber, the flue gas A' produced through the oxygen-rich combustion is fully mixed with the flue gas B' produced through the oxygen-poor combustion, the secondary combustion is conducted, and the heat in the fuel can be fully released.

Description

technical field [0001] The invention relates to a combustion method and a combustion device, in particular to a premixed staged combustion method and device, and belongs to the technical field of boilers. Background technique [0002] Premixed combustion can effectively reduce thermal NOx emissions. If lower thermal NOx emissions are to be obtained, it can be solved by lowering the combustion temperature. The effective ways to reduce the combustion temperature are: increase the oxygen content in the flue gas to make the fuel burn under the condition of oxygen-rich premixing; reduce the oxygen content in the flue gas and increase the CO content to make the fuel burn under the oxygen-poor premixed condition . [0003] For example, the Chinese patent with the publication number CN 107246608A discloses an air staging combustion device and an air staging configuration method, including a throat, a burner, an outer ring tube, and a refractory material layer closely attached to t...

Claims

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Application Information

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IPC IPC(8): F23C6/04F23C7/02
CPCF23C6/04F23C7/02F23C2201/102Y02E20/34
Inventor 邱周春孙浩迪孙亮何健
Owner 浙江力巨热能设备有限公司