KR101730003B1 - Pet-coke burner and the method of it - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a petroleum coke fuel combustion apparatus and a method for operating the same, and more particularly, to a petroleum coke fuel combustion apparatus and a petroleum combustion combustion apparatus having a multistage divided structure for minimizing the generation of nitrogen oxides A first injection unit to which fuel is supplied; A first supply unit for supplying air while the first injection unit is inserted; A second injection unit into which the petroleum coke and the transfer gas are injected while the first supply unit is inserted; A second supply part to which air is supplied while the second injection part is inserted; And a third supply unit to which air is supplied while the second supply unit is inserted, wherein the NOx purifying catalyst is provided with NOx ) Reduction, while maximizing the combustion efficiency.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a petroleum coke fuel burning apparatus,

More particularly, the present invention relates to a petroleum coke fuel combustion and combustion furnace for a petroleum coke fuel combustion apparatus and a crucible combustion apparatus having a multi-stage partition structure for minimizing the generation of nitrogen oxides.

At present, the main energy source of mankind is hydrocarbon fossil fuel.

However, environmental pollution caused by combustion products of fossil fuels is seriously raised.

The main sources of environmental pollution include nitrogen oxides (NOx), carbon dioxide (CO2), and carbon monoxide (CO) and soot resulting from incomplete combustion of fuel.

In conventional combustors using fossil fuels, it is inevitable to produce nitrogen oxides (NOx) having chemical formulas of NO and NO2 by chemical reaction at the time of combustion.

The low NOx combustion technology for suppressing the generation of nitrogen oxides (NOx) is being developed by improving the structure of the combustor such as the mixture form of the fuel and the air and the air-fuel ratio.

Nitrogen oxides generated in the combustion process react with other oxygen in the atmosphere and cause environmental problems such as smog and atmospheric ozone increase.

In particular, emissions from these combustion processes are harming the environment and human health, and countries are tightening regulations on an increasingly stringent level.

  Petroleum coke has a very low content of volatile components and a very high content of fixed carbon, so it has poor ignitability and reactivity, and a long residence time at high temperature is required for complete combustion.

Prior art US 6,325,002 discloses a technique for reducing emissions of nitrogen oxides from combustion of carbon fuels using flue gas recirculation.

However, the prior art U.S. Patent No. 6,325,002 fails to minimize the concentration region of the combustion reaction and thus generates a hot spot at a high temperature, so that a large amount of nitrogen oxides is still released.

Such a conventional combustor has a problem in that it is difficult to secure the stability of the combustion system and the efficiency is low because the coal (pulverized coal) combustor is modified and optimized.

In other words, the conventional combustor has a fatal problem that a large amount of harmful substances (NOx) are generated.

Such a conventional combustor hinders efficient use of energy, thereby increasing the burden on the fuel cost, and also has a problem of increasing the maintenance cost of the post-treatment equipment such as the SCR.

United States Patent No. 6,325,002

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a petroleum coke fuel burner for minimizing the amount of nitrogen oxides generated during combustion of petroleum coke fuel, And it is an object of the present invention to provide a combustion apparatus.

In order to solve the above problems, the present invention provides a fuel injector comprising: a first injection unit to which fuel is supplied; A first supply unit for supplying air while the first injection unit is inserted; A second injection unit into which the petroleum coke fuel and the transfer gas are injected while the first supply unit is inserted; A second supply part to which air is supplied while the second injection part is inserted; And a third supply unit to which air is supplied while the second supply unit is being inserted.

The present invention also provides a combustion apparatus for a petroleum coke oven combustion and a crucible, characterized in that a swirling section is formed at the tip of at least one of the second supply section and the third supply section.

Also, the first injecting portion, the second injecting portion, the first supplying portion, the second supplying portion, and the third supplying portion are circular in cross section and are provided with a combustion furnace for a petroleum coke fuel combustion and a crucible .

The gap between the first supply part and the second supply part may be smaller than the gap between the second injection part and the second supply part, And the third supply part is formed to be smaller than the gap between the third supply part and the petroleum coke fuel burning device.

The first supply unit is supplied with 10 to 35% of the total amount of combustion air, the second supply unit supplies 10 to 40% of the total amount of combustion air, and the third supply unit supplies 35 To 65% of air is supplied to the combustion chamber for combustion of petroleum coke fuel.

Also, the feed air supplied to the second injecting unit is supplied at a ratio of 5% to 15% of the total amount of air, and includes the petroleum coke fuel burning and combustion burning apparatus.

The method may further include: a first step of raising the temperature of the furnace to a first temperature using fuel; And a second step of supplying petroleum coke fuel to the combustion furnace. The method for operating a petroleum coke fuel combustion and combustion furnace according to claim 1,

Also, the first temperature is at least 800 degrees Celsius and not more than 1200 degrees Celsius.

The present invention as described above has the following effects.

First, since the multistage multi-stage feed system is provided through the first, second, and third supply units, the central region of the initial combustion reaction is minimized to prevent hot spots from being generated, ).

Second, there is an advantage of inducing NOx reduction through the separation of the fuel rich region and the lean region.

Third, since the pivot portion is formed in at least one of the second supply portion and the third supply portion near the end of the nozzle, which is the end of the combustor, the petroleum coke fuel is moved to the nozzle end while forming the cyclone motion in the rotation type together with the transfer air, The residence time in the combustion furnace is ensured and a sufficient combustion reaction is performed.

Fourth, the gap between the first supply part and the second injection part is formed to be smaller than the gap between the second injection part and the second supply part, and the gap between the second injection part and the second supply part is smaller than the gap between the second supply part and the third supply part The amount of air to be supplied through the first supply portion, the second supply portion, and the third supply portion is differently provided, so that more effective combustion can be performed.

Fifth, since the fuel is burned in the combustion furnace to raise the temperature of the combustion furnace to the first temperature, and the petroleum coke fuel is supplied, the combustion efficiency is maximized and the generation of nitrogen oxides is minimized.

Sixth, petroleum coke fuel can be burned and burned with other fuels, so that stability of combustion and improvement of stability and economical efficiency of combustion system can be achieved in addition to realization of low pollution.

1 is a conceptual diagram of a petroleum coke combustion system according to a preferred embodiment of the present invention.
2 is a side sectional view of a combustor according to a preferred embodiment of the present invention.
3 is a front cross-sectional view of a combustor according to a preferred embodiment of the present invention.
4 is a perspective view of a combustor according to a preferred embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, the definitions of these terms should be described based on the contents throughout this specification.

1. Description of components

1 is a conceptual diagram of a petroleum coke combustion system according to a preferred embodiment of the present invention.

FIG. 2 is a side sectional view of a combustor 100 according to a preferred embodiment of the present invention, and FIG. 3 is a front cross-sectional view of a combustor 100 according to a preferred embodiment of the present invention.

4 is a perspective view of a combustor 100 according to a preferred embodiment of the present invention.

The combustor 100 is formed at one side of the combustion furnace 200 and combusts the petroleum coke fuel into the combustion furnace 200.

As shown in FIG. 1, the entire combustion apparatus is composed of a combustor 100 and a furnace 200.

The furnace 200 must be able to withstand high temperature conditions of more than 1500 degrees Celsius. Therefore, it can be applied to a rectangular or circular combustion furnace (200) surface which is constructed of a heat resistant material capable of withstanding high temperature or can be cooled by utilizing air and cooling water.

3, the combustor 100 includes a first injection unit 111, a first supply unit 121, a second injection unit 112, and a third injection unit 114. The first injection unit 111, the first supply unit 121, the second injection unit 112, The second supply part 122, and the third supply part 123 in this order. 3 and 4, the first injection unit 111, the injection tube of the first supply unit 121 (the portion surrounding the first injection unit 111), the second injection unit 112 ), The injection tube of the second supply portion 122 (the portion surrounding the second injection portion 112), the injection tube of the third supply portion 123 (the injection of the second injection portion 112 and the second supply portion 122) The tube-wrapping portion) is coaxial, and its inner diameter gradually increases.
On the other hand, mixed liquid fuel is injected into the first injection portion 111.

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The first injection unit 111 is inserted into the first supply unit 121 and the first combustion air is supplied to the first supply unit 121 to burn the liquid fuel injected into the first injection unit 111.

Petroleum coke fuel and air for transporting it are injected into the second injection part 112.

The second injection portion 112 is inserted into the second supply portion 122, and air is supplied to the second supply portion 122.

The second supply part 122 is inserted into the third supply part 123, and air is supplied to the third supply part 123.

Thus, the combustion air is divided into primary, secondary, and tertiary air through the first supply unit 121, the second supply unit 122, and the third supply unit 123.

This multi-stage supply of air minimizes the concentration area of the initial combustion reaction and prevents the generation of hot spots at high temperatures, thereby suppressing the generation of thermal NOx.

In addition, nitrogen oxide (NOx) reduction is induced through the separation of the fuel rich region and the lean region.

The primary air supplied to the first supply part 121 is supplied in a direction perpendicular to the axial direction of the combustor 100 to eliminate the high temperature region formed at the beginning of the flame.

Since the primary air supplied to the first supply part 121 is supplied in a direction perpendicular to the axial direction of the combustor 100, generation of thermal NOx generated at a high temperature can be suppressed.

The primary air supplied to the first supply part 121 is supplied to occupy 10 to 35% of the total air amount.

It is preferable that the swivel part 130 is formed on at least one of the second supply part 122 and the third supply part 123.

Secondary air supplied through the second supply part 122 and tertiary air supplied through the third supply part 123 form a strong swirling flow due to the swivel parts 130 and 130 '.

At this time, the secondary air supplied through the second supply part 122 and the tertiary air supplied through the third supply part 123 can increase the turbulence intensity by making the swing strength, the flow rate, and the flow velocity different.

Secondary air and tertiary air induce strong turbulence at the tip of the flame, ensuring flame stabilization.

It is possible to use the swivel parts 130 and 130 'of the second supply part 122 and the third supply part 123 and the swivel parts 130 and 130' of the same angle or different angles, It should be noted that the flow rate and flow rate should be different from each other so that the strength of the swirling flow is different.

The secondary air supplied to the second supply part 122 is supplied so as to occupy 10% to 40% of the total amount of combustion air, but this may vary depending on the capacity of the combustor 100 or the fuel condition.

The tertiary air supplied to the third supply part 123 is supplied so as to occupy 35% to 65% of the total amount of combustion air.

The distance between the first feeding part 121 and the second feeding part 112 may be smaller than the distance between the second feeding part 112 and the second feeding part 122 desirable.

The gap between the second injection part 112 and the second supply part 122 may be smaller than the gap between the second supply part 122 and the third supply part 123.

The regeneration oil or heavy oil used for mixing is supplied through the first injection unit 111 at the center of the combustor 100 through a pressurized or air / steam mixed injection nozzle.

The first injection unit 111 supplies the liquid fuel and can be used as a liquid fuel supply unit at the time of initial heat-up of the combustion system before the injection of the petroleum cocos fuel.

The petroleum coke fuel, which is a solid fuel, is supplied through the second injection unit 112 together with the air as the transfer gas.

Petroleum coke fuel and air for transporting it are supplied to the periphery of the first supply part 121.

The petroleum coke fuel is allowed to travel with the transfer air to the nozzle end 1404, which is the end of the combustor 100, with a cyclone motion of a rotational type.

Since the cyclone motion type is in a rotating and progressing mode, the residence time is maximized so that the fuel can sufficiently cause a combustion reaction in the combustion furnace 200.

This allows the fuel to achieve a sufficient combustion reaction in the furnace 200 so that the stability of the flame can be maintained.

At this time, the amount of the transferring air is supplied at a ratio of 5% to 15% of the total amount of air.

2. Explanation of operation method of combustion device

Since petroleum coke has little volatilization and a large amount of fixed carbon, a combustion furnace (200) condition that is heated to a high temperature is required for stable combustion.

The combustion apparatus according to the present invention raises the temperature of the combustion furnace 200 using liquid fuel such as refined oil and heavy oil, and supplies the petroleum coke fuel when the combustion furnace 200 is sufficiently heated.

In other words, it is preferable to inject petroleum coke fuel only when the temperature of the furnace 200 reaches about 1000 degrees centigrade.

Thereafter, it is preferable that the petroleum coke fuel burning is carried out as necessary or the combustion ratio system is set by operating the combustion system.

The high temperature exhaust gas formed through such a combustion device can be applied to an industrial combustion system such as a boiler.

More specifically, in the first step, the temperature of the furnace 200 is raised to the first temperature by using the fuel.

The first temperature is preferably in the range of 800 DEG C or more and 1200 DEG C or less.

When the temperature of the combustion furnace 200 is heated to the first temperature, the process proceeds to the second step in which the coke fuel is supplied to the combustion furnace 200.

The coke fuel supplied in the second step is smoothly combusted in the combustion furnace 200 heated to the first temperature, so that the emission of nitrogen oxides is reduced.

4, when the petroleum coke fuel is transferred from the combustor 100 toward the nozzle end 1404, the coke fuel proceeds while cyclone motion is performed therein, so that the residence time is maximized and the combustion is smoothly performed As a result, the emission of nitrogen oxides is greatly reduced.

It is also desirable that the combustor 100 is capable of burning petroleum coke fuel and mixed combustion with liquid fuel such as refined oil and heavy oil.

The range in which the petroleum coke fuel and the liquid fuel can be mixed together is preferably in the range of 10 to 0 under the burning condition.

It is preferable that the petroleum coke fuel and the liquid fuel are formed at a ratio of 7 to 3 when the petroleum coke fuel and the liquid fuel are mixed together.

Of course, the mixing ratio between the petroleum coke fuel and the liquid fuel can be variously changed or adjusted so that burning and burning can be performed according to the use environment and the combustion condition.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the present invention can be changed.

100: Combustor
111:
112:
121:
122:
123: third supply unit
130, 130 ': turning part
140: nozzle end
200: Combustion furnace

Claims (8)

A combustion furnace 200 and a combustor 100 disposed at one side of the combustion furnace 200 for supplying fuel and air to the combustion furnace 200, As an apparatus,
The combustor (100)
A first injection unit 111 into which liquid fuel is injected;
The primary combustion air of 10 to 35% of the total amount of air supplied to the combustion furnace communicates with the first injection portion 111 and is supplied in a straight line direction as the axial direction of the combustor 100 121);
A second injection part 112 supplied with 5-15% of the total amount of air supplied to the combustion furnace, the air being supplied from the petroleum coke fuel and the air for transporting the petroleum coke fuel;
A second supply part 122 communicating with the second injection part 112 and supplied with secondary combustion air of 10 to 40% of the total amount of air supplied to the combustion furnace;
A third supply unit 123 communicating with the second injection unit 112 and supplied with 35 to 65% of the total amount of air supplied to the combustion furnace; And
And a swirling part 130 provided at the ends of the second supply part 122 and the third supply part 123 to supply the secondary and tertiary air to the combustion furnace 200 as a swirling flow In addition,
The injection tube of the first injection part 111, the injection tube of the first supply part 121, the injection tube of the second injection part 112, the injection part of the second supply part 122, The inner diameters of the coils are coaxially increased,
Wherein an interval between the outer circumferential surface and the inner circumferential surface of each injection tube is wider toward the outside of the combustor,
When the temperature in the combustion furnace 200 becomes equal to or higher than a predetermined first temperature through the combustion of the liquid fuel and the primary combustion air supplied to the combustion furnace 200, The secondary combustion air is supplied to the combustion furnace 200 to be burned,
The air having passed through the swirling unit 130 and having a swirling flow is supplied in a multi-stage split manner, whereby hot spot generation and NOx generation in the combustion furnace 200 are suppressed,
Petroleum coke fuel burning and burning combustion devices.
The method according to claim 1,
A plurality of revolving bodies 131 are provided inside the revolving unit 130. The revolving bodies 131 protrude in the thread direction with respect to the axial direction of the first injecting unit 111, The secondary combustion air and the tertiary combustion air are injected into the second injection part 112 while being rotated by the slewing body 131 of the first injection part 130,
Petroleum coke fuel burning and burning combustion devices.




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