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Flue gas and air premixing pipe bundle self-cooling low-nitrogen combustion device and combustion method thereof

A low-nitrogen combustion, low-nitrogen burner technology, applied in the combustion method, flue gas combustion, burner and other directions, can solve the problems of high local flame temperature, excessive nitrogen oxide emissions, and large excess air coefficient, and reduce combustion. Temperature and surface flame temperature, control of nitrogen oxides generation, effect of reducing nitrogen oxides generation

Active Publication Date: 2017-04-26
王立臣
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing boiler burner structure and control methods have problems such as large excess air coefficient and high local flame temperature, which make the emission of nitrogen oxides exceed the standard. key

Method used

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  • Flue gas and air premixing pipe bundle self-cooling low-nitrogen combustion device and combustion method thereof
  • Flue gas and air premixing pipe bundle self-cooling low-nitrogen combustion device and combustion method thereof

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Embodiment

[0035] Example: see attached figure 1 , 2, a flue-air premixed tube bundle self-cooling low-nitrogen combustion device and its combustion method, which is provided with a gas pipeline, a blower 2, a flue-air premixed tube bundle self-cooling low-nitrogen burner 1; the air inlet of the blower is connected with a flue gas mixer 3. The outlet of the blower is connected with a smoke-air mixing pipe 9, and the smoke-air mixing pipe is connected with a smoke-air mixing ejector 7; the low-nitrogen burner is provided with a wind jacket 34, and a main gas nozzle is arranged in the wind jacket 35. The main gas nozzle passes through the flange at the rear end of the wind jacket, and is fixedly arranged in the middle of the wind jacket. A position-adjustable swirl piece 29 is arranged on the outer periphery of the front end, and a ring is arranged around the main gas nozzle in the wind jacket. The smoke and wind mixed gas cooling tube bundle 28, the smoke and wind mixed gas tube bundle i...

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Abstract

The invention discloses a flue gas and air premixing pipe bundle self-cooling low-nitrogen combustion device and a combustion method thereof. The flue gas and air premixing pipe bundle self-cooling low-nitrogen combustion device comprises a gas pipeline, an air blower and a flue gas and air premixing pipe bundle self-cooling low-nitrogen combustor; a flue gas and air mixing device is connected to an air inlet of the air blower; a flue gas and air mixing pipeline is connected to an air outlet of the air blower; a flue gas and air mixing ejector is connected onto the flue gas and air mixing pipeline; an air sleeve is arranged on the low-nitrogen combustor; a main gas jet pipe is arranged in the air sleeve; a circle of flue gas and air mixing cooling pipe bundle is arranged on the periphery of the main gas jet pipe and directly goes deep into a hearth; a burning torch is arranged on the combustor; a flue gas and air mixing inlet is formed in the air sleeve; the rear end of the main gas jet pipe communicates with a big fire gas pipeline provided with a big fire valve and a small fire gas pipeline provided with a small fire valve; and a flame detector is arranged on the end head of the burning torch. The device is applicable to a gas boiler, has the characteristics of simple structure, reasonable design, flame combustion with low nitrogen at low temperature, capability of automatic cooling, accurate control and the like, and ensures lower nitric oxide emission load of the gas boiler.

Description

technical field [0001] The invention relates to the technical field of low-nitrogen combustion of gas-fired boilers, in particular to a self-cooling low-nitrogen combustion device and a combustion method for a flue-air premixed tube bundle. Background technique [0002] The nitrogen oxides produced during fuel combustion are mainly NO and a small amount of NO2, which are collectively referred to as NOx. NO accounts for about 90% of the nitrogen oxides generated during the combustion of gas, and the rest is NO2. Nitrogen oxides are an important cause of photochemical smog and acid rain. [0003] The generation and emission of NOx are related to conditions such as combustion temperature and excess air ratio. There are three main mechanisms for the formation of NOx in various combustion processes, namely thermal NOx, instantaneous reaction NOx and fuel NOx. According to the mechanism of NOx generation, the factors affecting the amount of NOx generation mainly include flame t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C9/08F23D14/24F23N1/02
CPCF23C9/08F23C2202/30F23D14/24F23D2900/14F23N1/02F23N2221/12F23N2239/04
Inventor 王立臣
Owner 王立臣
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