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A deep energy-saving process for tubular heating furnace

A tubular heating furnace and process technology, which is applied to the field of deep energy-saving technology of tubular heating furnaces, can solve the problems of no fuel gas, thermal efficiency is difficult to reach the design expected level, and high exhaust gas temperature, so as to save fuel gas and reduce the acidity of flue gas. The effect of dew point corrosion and high burning intensity

Active Publication Date: 2018-11-23
上海浩用工业炉有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since most of the tubular heating furnaces in refineries currently use fuel gas (refinery gas, natural gas or liquefied petroleum gas), they all contain a considerable amount of H 2 S gas, but the detection value of fuel gas sulfur content in actual production operations is often 100-300μL / L, sometimes even higher, resulting in high exhaust gas temperature, and the thermal efficiency is difficult to reach the expected level of design.
Fundamentally speaking, in order to reduce corrosion, sulfur or hydrogen sulfide in fuel must be removed first, but there are basically no processes or equipment for deep desulfurization of fuel gas in the published patents and literatures
But for the first point, there is no literature or patent report on strengthening the deep desulfurization treatment of fuel

Method used

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Embodiment 1

[0032] A deep energy-saving process for a tubular heating furnace, the process of which is as follows figure 1 As shown, the tubular heating furnace combustion system is mainly composed of fuel gas and air. In the method of the present invention, the fuel gas passes through the fuel gas preheater 11 and the gas desulfurization reactor 12, and the air passes through the air preheater 21. Enter the double preheating burner 3, and then burn in the tube heating furnace 4.

[0033] Fuel gas is generally refinery gas, natural gas or liquefied petroleum gas, in which the sulfur content is generally 100-300 μL / L, and the temperature is generally room temperature. The fuel gas first enters the fuel gas preheater 11 through the fuel gas pipeline 1, and is preheated to 100°C by the high-temperature flue gas. Subsequently, the fuel gas passes through the gas desulfurization reactor 12, and a desulfurization reaction occurs in the gas desulfurization reactor 12, reducing the sulfur conten...

Embodiment 2

[0039] A deep energy-saving process for a tubular heating furnace, the process of which is as follows figure 2 As shown, it is generally the same as in Example 1, the difference is that since the fuel gas still cannot reach the reaction temperature required by the gas desulfurization reactor 12 after being preheated by the fuel gas preheater 11, it needs to pass through the tubular heating furnace 3 Auxiliary heating to 500 ° C, and then into the gas desulfurization reactor 12 for deep desulfurization treatment. The air is combustion-supporting air, generally at room temperature. The air first enters the air preheater 21 through the air pipeline 2, and is preheated to 500°C by the high-temperature flue gas.

Embodiment 3

[0041] The deep energy-saving process of the tubular heating furnace can also use the fuel gas without preheating, and directly desulfurize it at a working condition of about 40°C before entering the fuel burner of the heating furnace. A conventional low-nitrogen oxide burner can be used, and the internal gas desulfurization reactor can be appropriately increased. The catalyst prolongs the desulfurization time and improves the efficiency of the desulfurization reactor.

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Abstract

The invention relates to a tube heating furnace deep energy-saving technology. The technology employs an energy-saving concept of fuel gas deep desulfurization, and functions of dual pre-heating combustors are improved through the addition of a fuel gas pre-heater and a gas desulfurization reactor, so that the dew-point temperature in the flue gas can be reduced, the exhaust gas temperature of the flue gas can be decreased, the thermal efficiency of a system can be improved, high-intensity combustion can be performed, the energy utilization rate is high, the fuel is saved, a process flow is simple, a good environmental protection function is achieved, and the reliability and security during an operation process are high. Compared with the prior art, the method can be widely applied, an operation period is long, the reliability and the security are high, the engineering investment is saved, and an improved method is provided for energy conservation for a tube heating furnace.

Description

technical field [0001] The invention belongs to the field of tubular heating furnaces, and in particular relates to a deep energy-saving process for tubular heating furnaces. Background technique [0002] For a long time, the acid dew point corrosion caused by sulfide in the flue gas has been serious, which affects the long-term safe operation of the heating furnace equipment of the refinery unit. In order to protect the equipment, it is often necessary to increase the final discharge temperature of the flue gas so that the temperature of the cold surface is higher than the dew point temperature, thereby preventing or reducing acid corrosion caused by condensation. As refineries have higher and higher requirements for energy saving and consumption reduction, the acid dew point corrosion of flue gas has become the main obstacle to reduce the flue gas temperature of tubular furnaces and improve thermal efficiency, which has brought great troubles to refineries. Finding ways t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23K5/00F23L15/00F23C5/08F27D17/00B01D53/74B01D53/52B01D53/48C10L3/00C10L3/10
CPCY02E20/34
Inventor 闫广豪马雷张明会
Owner 上海浩用工业炉有限公司
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