Tube heating furnace low-calorific value fuel gas stable combustion method

A tubular heating furnace, stable combustion technology, applied in the direction of combustion method, combustion equipment, fuel supply, etc., to achieve the effects of high combustion intensity, simple process flow, and fuel saving

Active Publication Date: 2015-10-07
上海浩用工业炉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a method for stable combustion of low calorific value fuel gas in a tubular heating furnace in order to overcome the above-mentioned defects in the prior art, so as to solve the problem of reasonable and effective utilization of low calorific value gas fuel generated in the production process of petrochemical enterprises. The fuel gas is heated to a higher temperature in the convection section of the tubular heating furnace or the heat exchanger, and various combination schemes for the stable combustion of the low calorific value fuel gas are proposed to fully ensure the high efficiency and stability of the low calorific value fuel gas in the tubular heating furnace combustion

Method used

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  • Tube heating furnace low-calorific value fuel gas stable combustion method

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Effect test

Embodiment 1

[0041] A new method for stable combustion of low calorific value fuel gas in tubular heating furnaces, the process is as follows figure 1 As shown, the combustion system of the tubular heating furnace is mainly composed of fuel gas and air. The fuel gas is divided into low calorific value fuel gas and auxiliary blended fuel gas. In the method of the present invention, the low calorific value fuel gas passes through the fuel gas low pressure drop preheater 6 enters the burner 3 after heating, the burner 3 is a dual-fuel burner, and the fuel gas low pressure drop preheater 6 is a turbulent heat exchanger, and then diffusion combustion occurs in the tubular heating furnace 4.

[0042]Low calorific value fuel gas is generally flexible coking gas, desorbed gas, various types of coal gas, etc. in refineries, and the temperature is generally room temperature. The low calorific value fuel gas first enters the fuel gas low-pressure drop preheater 6 through the main fuel gas pipeline 1,...

Embodiment 2

[0048] A new method for stable combustion of low calorific value fuel gas in tubular heating furnaces, the process is as follows figure 2 As shown, it is generally the same as that of Embodiment 1, except that the auxiliary blended fuel gas is not blended, and the auxiliary blended fuel gas pipeline 7 is not required, and only the low calorific value fuel gas is preheated by the fuel gas low-pressure drop preheater 6. Participate in diffusion combustion after being heated to 100-500°C. The burner adopts a conventional low-nitrogen oxide burner, and the fuel gas low pressure drop preheater 6 is a tubular heat exchanger.

[0049] When the low calorific value fuel gas is preheated for high-intensity combustion, on the one hand, the combustion of the low calorific value fuel gas can be stabilized, and on the other hand, the energy utilization rate of the low calorific value fuel can be increased by 2%-12%.

Embodiment 3

[0051] A new method for stable combustion of low calorific value fuel gas in tubular heating furnaces, the process is as follows image 3 As shown, it is generally the same as that of Example 1, except that the auxiliary blended fuel gas is not blended, the auxiliary blended fuel gas pipeline 7 is not required, and only the low calorific value fuel gas is preheated to 100- Participate in diffusion combustion after 500°C, while the combustion-supporting air is preheated to 100-500°C by the combustion-supporting air preheater 22, the burner 3 is a double preheating low-NOx burner, and the heat source of the combustion-supporting air preheater 22 can be multiple A heat source, such as high temperature flue gas or medium and low pressure steam.

[0052] When the low-calorific-value fuel gas and air are simultaneously preheated for high-intensity combustion, on the one hand, the combustion of the low-calorific-value fuel gas can be stabilized, and on the other hand, the energy util...

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Abstract

The invention relates to a tube heating furnace low-calorific value fuel gas stable combustion method. The method comprises following steps: a fuel gas low-dropout pre-heater is added to a convection zone of a tube heating furnace, low-calorific value fuel gas is pre-heated to 100-500 DEG C through the fuel gas low-dropout pre-heater firstly, and then the low-calorific value fuel gas is introduced into the tube heating furnace; high-calorific value fuel gas is employed as the auxiliary blending fuel gas and is introduced into the tube heating furnace through an auxiliary blending fuel gas pipeline; normal temperature air is employed as the combustion air, is not required to be re-heated, and is sent to the tube heating furnace through a negative pressure suction manner or a blower fan; and finally stable combustion is carried out in the tube heating furnace. Compared with the prior art, the method has obvious application values in the field of the tube heating furnace combusting low-calorific value fuel gas, an operation period is long, the reliability and the security are high, the engineering investment is saved, and an improved method is provided for stable combustion for the tube heating furnace employing the low-calorific value fuel gas.

Description

technical field [0001] The invention belongs to the field of tubular heating furnaces, and in particular relates to a method for stabilizing combustion of low calorific value fuel gas in tubular heating furnaces. Background technique [0002] At present, petrochemical enterprises produce a large number of low calorific value by-product gaseous fuels in the production process of oil products and chemicals, mainly including flexible coking gas, desorbed gas, and various types of coal gas, etc., which are all clean fuel gases, but heat relatively low value. According to the calorific value, gas fuel can be divided into three categories: the calorific value greater than 15107kJ / m3 is high calorific value fuel, the calorific value is (6128~15107) kJ / Nm3 is medium calorific value fuel, and the calorific value is less than 6128kJ / Nm3 is low calorific value fuel . The lower the calorific value of the fuel, the more difficult its combustion is to control the tissue. The flexible c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23K5/00F23L15/00
CPCY02E20/34
Inventor 马雷张明会
Owner 上海浩用工业炉有限公司
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