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A heat exchange type flameless combustion furnace and its control method

A flameless combustion, heat exchange technology, applied in the combustion method, the use of a variety of fuel combustion, combustion types and other directions, can solve the problem of not easy to achieve flameless combustion, reduce power requirements, enhance mixing in the furnace, speed and the effect of reducing dilution requirements

Active Publication Date: 2019-01-29
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the small size of the furnace in this design, when the combustion power is high, the temperature of the furnace wall is too high and it is not easy to achieve flameless combustion

Method used

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  • A heat exchange type flameless combustion furnace and its control method
  • A heat exchange type flameless combustion furnace and its control method
  • A heat exchange type flameless combustion furnace and its control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The heat exchange type flameless combustion furnace of the present embodiment is used for flameless combustion industrial boilers, such as figure 2 shown. First, the wall surface of the refractory material furnace is preheated to 800° C. by means of flame combustion. At this time, the water flow of the water cooling sleeve 3 is small, and the heat of the preheated refractory material furnace is basically not taken away. Thereafter, the flameless burner 1 is switched to the flameless combustion state, and at the same time, the water-cooled sleeve 3 performs independent heat exchange for the three regions, and the water intake is dynamically adjusted according to the temperature measurement results of the thermocouple 24, so that the wall surface temperature of the refractory material furnace At around 1000°C. After the flameless combustion is realized, the generated high-temperature and low-pollution flue gas enters the two-pass heat exchange tube bundle 13 through the...

Embodiment 2

[0036] The flameless combustion furnace of the heat exchange type of the present embodiment is used for the flameless combustion rolling steel heating furnace, such as image 3 shown. First, the wall surface of the refractory material furnace is preheated to 800° C. by means of flame combustion. At this time, the water flow of the water cooling sleeve 3 is small, and the heat of the preheated refractory material furnace is basically not taken away. Thereafter, the flameless burner 1 is switched to the flameless combustion state. Since the heating of steel rolling requires a large amount of heat, and the length and width of the refractory material furnace are relatively small, the water-cooling sleeve adopts an integrated water cooling method, and the entire refractory material furnace Perform heat exchange. The furnace wall is maintained at about 1200°C in this application example. The high-temperature flue gas produced by the refractory material furnace enters the furnace 1...

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Abstract

The invention discloses a heat exchange type flameless combustion hearth and a control method thereof. A refractory material furnace of the heat exchange type flameless combustion hearth has a gradually-expanded angle, heat exchange control is conducted for different areas in the refractory material furnace through multiple independent area water cooling sleeves, and therefore the requirements for the speed and dilution of flameless combustion can be lowered and flameless combustion of higher volumetric power can be achieved; high-temperature smoke generated after combustion can more rapidly flow back to a front mixing area, and the effect of enhancing inside-furnace mixing is achieved; the experiment result shows that after the gradually-expanded type furnace design is adopted, the speed of gas and an oxidizing agent of flameless combustion can be decreased by 20%, and the power requirement of gas conveying is effectively lowered; and meanwhile, after heat exchange of the independent water cooling sleeves, heat generated in the refractory material furnace can be effectively brought away in time, and therefore the volumetric power and temperature in the refractory material furnace are controlled to be within the optimal range of flameless combustion.

Description

technical field [0001] The invention relates to a combustion equipment furnace, in particular to a heat exchange type flameless combustion furnace and a control method thereof. Background technique [0002] Flameless combustion (MILD Combustion, Flameless Combustion) has the characteristics of high efficiency and low pollution. It is a new type of low NOx combustion technology. It has great development potential under the current situation of energy and environmental problems becoming more and more serious. Compared with traditional combustion, the realization of flameless combustion requires more precise adjustment of the furnace inlet conditions, the flow field in the furnace and the multiple conditions of the furnace wall. At present, most of the implementation methods for flameless combustion focus on controlling the speed, temperature and dilution degree of the inlet reactants to create a uniform reaction zone in the furnace, so as to realize flameless combustion. Comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24H1/44F24H9/18F23C1/00
CPCF23C1/00F24H1/44F24H9/1809Y02E20/34
Inventor 米建春张健鹏代冲舒子云
Owner PEKING UNIV