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Oxygen injector used for oxygen-enriched combustion

An oxygen-enriched combustion and oxygen injector technology, which is applied in the direction of combustion methods, combustion equipment, and non-flammable liquid/gas transportation, can solve the problems of uneven mixing of oxygen and flue gas or oxygen and air, so as to avoid incomplete combustion Stabilize and improve the effect of uneven mixing

Inactive Publication Date: 2015-01-28
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides an oxygen injector for oxy-fuel combustion, the purpose of which is to overcome the uneven mixing of oxygen and flue gas or oxygen and air in the current premixed oxy-fuel combustion problems, and can be applied to the field of waste oxygen-enriched incineration. According to the theory of fluids, the shape and size of the oxygen injector are designed, and it can be flexibly replaced according to the pipe and size of the flue gas or air to ensure that oxygen and flue gas or Oxygen and air mix well

Method used

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Examples

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Effect test

example 1

[0038] The oxygen injector of the present invention is used in a 200MW pulverized coal combustion boiler, and the circulating flue gas volume of the flue gas pipeline for oxygen injection is 108680m 3 / h, the total flow rate of injected oxygen is 18791m 3 / h, the inner diameter of the flue gas pipe is 1250mm, the diameter of the main oxygen pipe is 350mm, and the diameter of the oxygen direct pipe is 150mm. The oxygen is equally divided into four oxygen branch pipes through the main oxygen pipe. Oxygen is injected into the flue gas pipe during oxy-fuel combustion. Oxygen enters the four oxygen branch pipes from the main oxygen pipeline, then flows through the flowmeter and enters the oxygen direct pipe of the oxygen injector, and then is sprayed out through the replaceable oxygen injection ring pipe connected by the flange. The replaceable oxygen injection ring pipe The outer diameter of the ring is 0.8 times the inner diameter of the flue gas pipe, which is 1000mm; the cross...

example 2

[0040] Applying the present invention to a waste incineration grate furnace with a processing capacity of 350t / d, the primary air volume of the air pipeline for oxygen injection is 28717m 3 / h, the total flow rate of injected oxygen is 1500m 3 / h, the inner diameter of the air pipe is 920mm, and the diameter of the oxygen direct pipe is 80mm. During the oxygen-enriched incineration of garbage, oxygen is injected into the primary air duct. Oxygen enters the direct oxygen pipe of the oxygen injector from the oxygen pipe through the flowmeter, and then sprays out through the replaceable oxygen injection ring connected by the flange. The outer diameter of the replaceable oxygen injection ring pipe is 0.7071 times the inner diameter of the air pipe. The outer diameter of the cross-section of the oxygen injection ring pipe is the same as the diameter of the oxygen direct-flow pipe, which is 80mm; the diameter of the nozzle hole inside the oxygen injection ring is 0.37 times the out...

Embodiment 3

[0042] Applying the present invention to a waste incineration grate furnace with a processing capacity of 500t / d, the primary air volume of the air pipeline for oxygen injection is 41060m 3 / h, the total flow rate of injected oxygen is 2150m 3 / h, the inner diameter of the air pipe is 1100mm, and the diameter of the oxygen direct pipe is 95mm. During the oxygen-enriched incineration of garbage, oxygen is injected into the primary air duct. Oxygen enters the direct oxygen pipe of the oxygen injector from the oxygen pipeline through the flowmeter, and then sprays out through the replaceable oxygen injection ring pipe connected by the flange. The outer diameter of the replaceable oxygen injection ring pipe ring is 0.5 times the inner diameter of the air pipe , is 550mm; the cross-sectional diameter of the oxygen injection ring pipe should be selected to be the same as the diameter of the oxygen direct-flow pipe, which is 95mm; the diameter of the nozzle hole inside the oxygen in...

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Abstract

The invention discloses an oxygen injector used for oxygen-enriched combustion. The oxygen injector comprises an oxygen injection ring pipe; the oxygen injection ring pipe is provided with an oxygen inlet end; the oxygen inlet end is provided with a second flange; a plurality of oxygen injection ring inner side spray orifices are formed in the ring inner side wall of the oxygen injection ring pipe, and a plurality of oxygen injection ring outer side spray orifices are formed in the ring outer side wall of the oxygen injection ring pipe; the oxygen injector also comprises an oxygen straight flow pipe; one end of the oxygen straight flow pipe is provided with a first flange, and the other end of the oxygen straight flow pipe is communicated with an outside oxygen source. After the first flange and the second flange are fixed, outside oxygen enters the oxygen injection ring pipe through the oxygen straight flow pipe, and is sprayed in a direction vertical to the wall of an air or smoke pipeline through the oxygen injection ring inner side spray orifices and the oxygen injection ring outer side spray orifices to realize uniform mixing. According to the oxygen injector disclosed by the invention, the problems that local high temperature is caused and the combustion is insufficient due to the fact the oxygen and air or smoke are not mixed uniformly are effectively solved.

Description

technical field [0001] The invention belongs to the field of combustion / incineration, and more specifically relates to an oxygen injector for oxygen-enriched combustion. Background technique [0002] Oxygen-enriched combustion refers to combustion with oxygen-enriched air with a higher oxygen concentration than normal air. It is an efficient and energy-saving combustion technology. Oxygen-enriched combustion technology is currently mainly used in pulverized coal furnaces and circulating fluidized bed boilers. There are two ways of oxyfuel combustion: non-premixed oxygen and premixed oxygen. Oxygen non-premixing means that pure oxygen enters the burner through a separate pipe, and is mixed with pulverized coal and flue gas in the furnace for combustion. At present, the more commonly used method is that the central pipe passes pure oxygen for stable combustion and the pure oxygen pipeline is arranged in a ring between the primary and secondary air to send pure oxygen for sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23L7/00
CPCY02E20/34
Inventor 张世红王克付哲李斌邵敬爱杨晴杨海平王贤华陈汉平
Owner HUAZHONG UNIV OF SCI & TECH
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