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Method and device for burning petroleum coke by use of circulating fluid bed

A circulating fluidized bed and petroleum coke technology, applied in the field of circulating fluidized bed, can solve the problems of difficulty in ignition, difficulty in burning out, and less volatile matter, and achieve the effect of effective control and emission reduction

Inactive Publication Date: 2003-05-07
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of sulfur and nitrogen in petroleum coke is relatively high, and SO 2 and NO x Serious pollution; and its volatile matter is low, contains a large amount of external water, and it is difficult to catch fire
At present, due to the characteristics of low-pollution incineration of circulating fluidized bed, many countries are developing the technology of incinerating petroleum coke in fluidized bed; however, due to the influence of various characteristics of petroleum coke as fuel, some problems are still encountered during combustion, such as: It is difficult to burn out on fire, how to desulfurize, and the phenomenon of slag formation is easy to appear in the cyclone separator and tail flue of the circulating fluidized bed

Method used

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  • Method and device for burning petroleum coke by use of circulating fluid bed
  • Method and device for burning petroleum coke by use of circulating fluid bed
  • Method and device for burning petroleum coke by use of circulating fluid bed

Examples

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Effect test

Embodiment 1

[0019] Such as figure 1 As shown, a circulating fluidized bed utilizing the present invention is mainly composed of a cold slag pipe 1, a primary air duct 2, an air distribution plate 3, a membrane water wall 4, a combustion chamber 5, a secondary air duct 6, and a silo 7. Secondary superheater 8, steam drum 9, cyclone separator 10, feeder 11, third-stage superheater 13, primary superheater 8, air preheater 16, tail flue 19 and pipeline oil burner 20 constitute. The silo 7 for adding mixed fuel communicates with the combustion chamber 5, the bottom of the combustion chamber 5 is equipped with an air distribution plate 3, the inner wall of the upper part of the combustion chamber 5 is a membrane water wall 4, and the lower part is arranged with a thermal insulation and anti-wear layer 18, which is heat-resistant The wall height of the wear-resistant layer 18 accounts for 1 / 5 of the total height of the combustion chamber wall, such as figure 2 shown. The air duct is composed...

Embodiment 2

[0024] Keep the structure of the circulating fluidized bed in Example 1 unchanged, only change the height of the heat preservation and wear-resistant layer 18, so that the height of the heat preservation and wear-resistant layer 18 accounts for 1 / 6 of the total height of the wall surface of the combustion chamber 5 . Used petroleum coke mixed fuel can also adopt following proportioning; Coal accounts for 15% of the gross weight of two kinds of fuels of coal and petroleum coke, and the addition of desulfurizer limestone makes the mol ratio of Ca / s in the mixed mixed fuel after mixing be 1.3, while the particle size parameters in the mixed fuel are the same as in Example 1. Adopt the same method as embodiment 1, only the air supply volume is different in the staged combustion process, the primary air supply volume accounts for 65%, and the secondary air supply volume accounts for 35%, can reach the effect of embodiment 1 equally, make the desulfurization rate reach 90% %, reduce...

Embodiment 3

[0026] Such as figure 1 In the circulating fluidized bed, only the height of the thermal insulation and wear-resistant layer 18 is changed under the condition of keeping other structures unchanged, so that the height of the thermal insulation and wear-resistant layer 18 accounts for 1 / 5 of the total height of the combustion chamber 5 walls. Adopt same method and following mixed fuel, coal accounts for 20% of the gross weight of two kinds of fuels of coal and petroleum coke, and the addition amount of desulfurizer limestone makes the mol ratio of Ca / s in the mixed fuel after mixing be 1.5; In the fluidized bed staged combustion process, the primary air supply volume accounts for 70%, and the secondary air supply volume accounts for 30%. Under the condition that other parameters remain unchanged, the same effect as that of Example 1 can be achieved, and NOx emissions can be reduced. The desulfurization rate reaches 92%, eliminates the phenomenon of slag formation, is beneficial ...

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Abstract

This invention relates to a method and device for using oil coke as fuel in circulation fluidized bed solving the difficulties of burned-out in burning, desulfurization and lumping, slag-bonding appearing in end flue pipe and cyclone separator in the circulation fluidized bed. This invented oil coke combined fuel includes oil coke, coal and desulfurizer which can effectively removed SO2 and eliminate lumping and slag-bonding phenomenon and big mesh sieving is applied for oil coke particles to form thicken or thin phase beds in firing chamber, suitable for subjects balance in bed; warm scuff-resistant coating is designed under the circulation fluidized bed to form high temperature zone good for firing of oil coke and burning-out, stepped burning is good for reducing NOx exhaust.

Description

(1) Technical field [0001] The invention relates to a method for mainly using petroleum coke, an industrial solid waste, as a fuel, especially a method for using it in a circulating fluidized bed, and belongs to the technical field of fuel incineration. (2) Background technology [0002] Petroleum coke is a by-product of petroleum refining and is a solid waste. It can be used as raw materials for coking and electrodes, but when the content of sulfur and heavy metals in petroleum coke reaches a certain value, petroleum coke cannot be used for coking and electrodes. With the development and application of heavy oil and low-quality oil, the output of petroleum coke has increased year by year. Petroleum coke is a better fuel because of its high calorific value, less ash content and good grindability. However, the content of sulfur and nitrogen in petroleum coke is relatively high, and SO 2 and NO x The pollution is serious; and its volatile matter is low, and it contains a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
Inventor 沈伯雄姚强项光明刘惠永徐纪清李玉晗
Owner TSINGHUA UNIV
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