Fuel staging process for low NOx operations

A technology of fuel and fuel flow, which is applied in the field of fuel dilution nozzles and fuel dilution devices, and can solve problems such as low efficiency, low-efficiency steam injection mode, and uneconomical economy

Active Publication Date: 2005-05-18
AIR PROD & CHEM INC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, there is a huge economic price to be paid for reducing NOx emissions due to inefficient steam injectio...

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  • Fuel staging process for low NOx operations
  • Fuel staging process for low NOx operations
  • Fuel staging process for low NOx operations

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Embodiment Construction

[0059] The present invention solves a series of problems faced in the design of combustion equipment, such as burners for heating reformers, thermal processors, boilers, ethylene cracking furnaces or other high temperature furnaces. The present invention relates to an improved fuel staging process. In particular, two general methods to achieve rapid dilution and blending according to the desired processing purpose are:

[0060] I. Use another fuel to segment fuel (F-F): inject high-pressure refinery waste fuel, atomized liquid fuel, etc. into the vicinity of cleaner low-pressure gaseous fuel to achieve clean, maintenance-free, low NOx working conditions ;and

[0061] II. Fuel staging with inert gas (F-I): splitting high-pressure inert fluids such as water vapor, nitrogen, CO 2 Injection near low-pressure gaseous fuel to reduce NOx.

[0062] As used herein, the term "fuel index" (FI) is defined as the weighted total number of carbon atoms in a fuel, where H 2 is assigned a ...

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Abstract

A method of diluting fuel to reduce NOx using a fuel dilution device comprising: a first conduit having an inlet and an outlet for conveying fuel flowing into the inlet and out of the outlet in a first thermodynamic state and a first fuel index and a second conduit having an inlet and an outlet for conveying flow into the inlet and out of the outlet at a second/different thermodynamic state and a second fuel index that differs from the first fuel index by at least about 0.1 fluid flow, whereby there is a tendency to mix between the two streams exiting said outlet and discharge; near said outlet and discharge, at least a portion of the fuel mixes with at least a portion of the fluid, thereby producing a stream having intermediate fuel Exponential dilution of fuel flow.

Description

Background technique [0001] The present invention relates to fuel staging methods and systems for reducing nitrogen oxide (NOx) emissions, and more particularly to such methods and systems using fuel dilution nozzles in low NOx combustors. [0002] One of the challenges faced by the chemical process industry (CPI) is to burn spent fuel for economical reasons while meeting low NOx and CO emission requirements. Spent fuel contains a higher C / H ratio gas mixture which burns with a very bright flame due to the formation of carbon oxides and depending on the combustion conditions also produces carbon black particles or carbon. A typical refinery fuel composition includes varying amounts of fuel and inert gases (eg Cl, C2, C3, ... Cn, olefins, hydrogen, nitrogen, CO2, water vapour). If carbon or soot particles are formed on a fuel nozzle, under the appropriate current pressure and temperature conditions, the soot structure will usually grow near the nozzle exit. This can lead to c...

Claims

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Application Information

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IPC IPC(8): F23L7/00F23C6/04F23C99/00F23D14/24F23D14/58F23D17/00F23D99/00F23K5/00F23N1/00F23R3/28
CPCF23C2202/20F23K5/007F23K2900/05004F23L7/00F23L2900/07002F23L2900/07009F23C6/04F23R3/28
Inventor M·L·乔施X·J·李A·G·斯拉维科夫
Owner AIR PROD & CHEM INC
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