CN106032907A - Blast furnace gas burner ignition device and method - Google Patents

Abstract

The invention relates to the field of cyclic utilization of blast furnace gas and in particular relates to a blast furnace gas combustion ignition device and method. The blast furnace gas burner ignition device comprises a fuel oil supply gun arranged at the axis of a nozzle of a blast furnace gas burner, an air supply pipe sleeving the outside of the fuel oil supply gun coaxially, and a combustion stabilization cover which is arranged at the front end of the fuel oil supply gun and communicates with a combustion-supporting pure oxygen pipeline. The blast furnace gas burner ignition method is characterized by supplying pure oxygen to the nozzle of the blast furnace gas burner and a fuel oil nozzle to ignite blast furnace gas synchronously when fuel oil burns, and after the combustion lasts for some time, cutting the fuel oil supply and maintaining the pure oxygen supply until the temperature of a boiler meets the requirement for steady combustion of the blast furnace gas. According to the invention, the boiler is heated through the heating quantity of the blast furnace gas until the steady combustion of the blast furnace gas is realized, and ignition is completed successfully; the heat source employed by the ignition method is mainly blast furnace gas, so that the quantity of fuel oil required by start of the boiler is reduced and the ignition cost of the boiler is reduced.

Description

Blast furnace gas burner ignition device and method

technical field

The invention relates to the field of blast furnace gas recycling, in particular to a blast furnace gas combustion ignition device and an ignition method.

Background technique

Blast furnace gas is a low calorific value exhaust gas from steelmaking blast furnaces. As a gaseous fuel, there are more non-combustible components and less combustible components. The combustible components are about 30%, so its calorific value is low. Combustion The speed is slow, the ignition temperature is greater than 700°C, and it is not easy to catch fire. Considering the recycling of tail gas, for the self-owned power plants of large domestic steelmaking enterprises, cheap blast furnace gas is usually used as boiler fuel for power generation. However, due to the low calorific value of blast furnace gas, the blast furnace gas burners used in the boilers of self-owned power plants of large steelmaking enterprises are usually designed with a high gas velocity, which makes it unable to burn stably at low furnace temperatures. Therefore, during the start-up process of the blast furnace gas boiler, a large amount of combustion-supporting fuel oil needs to be put in for preheating. When the overall temperature of the boiler is higher than the ignition point of the blast furnace gas, the blast furnace gas is added to make it ignite and burn, and finally reach the cold state of the boiler. The purpose of ignition start. This makes it necessary to invest a large amount of combustion-supporting fuel oil during the start-up process of the boiler cold furnace, and the operating cost is relatively high.

Contents of the invention

The technical problem to be solved by the present invention is to provide an ignition device and method for a blast furnace gas burner. A small amount of fuel oil can be used to support the combustion of blast furnace gas at the initial stage of combustion. Stable combustion and smooth ignition; it solves the defect that the existing ignition method completely relies on fuel oil to heat the boiler, resulting in excessive fuel consumption.

The present invention is achieved like this: a kind of blast furnace gas burner ignition device comprises blast furnace gas burner spout and oil gun igniter, and described oil gun igniter comprises:

A fuel oil supply gun arranged at the axis of the nozzle of the blast furnace gas burner;

The air supply pipe coaxially set outside the fuel supply gun;

The combustion stabilization cover arranged at the front end of the fuel supply gun;

The combustion stabilization hood communicates with the combustion-supporting pure oxygen pipeline.

A pure oxygen cavity is provided on the stable combustion cover, the pure oxygen cavity is an annular cavity, and the pure oxygen cavity is coaxially set on the front end of the fuel supply gun, between the gas outlet of the pure oxygen cavity and the stable combustion cover Separated by an annular baffle, the annular baffle has a plurality of through holes in an annular array, and the combustion-supporting pure oxygen pipeline communicates with the air inlet of the pure oxygen chamber.

The fuel supply gun is a gasification fuel spray gun.

A method for igniting a blast furnace gas burner. A combustion flame port is provided to cover a fuel nozzle of the blast furnace gas burner nozzle. When the fuel is burning, pure oxygen is supplied to the blast furnace gas burner nozzle and the fuel nozzle to simultaneously ignite the blast furnace gas, and it is cut off after burning for a period of time. The fuel oil supply maintains the pure oxygen supply until the boiler temperature reaches the requirement for the stable combustion of blast furnace gas, then cuts off the pure oxygen supply, and finally realizes the smooth ignition of the boiler.

The ignition device and method of the blast furnace gas burner of the present invention can use a small amount of fuel oil to support the combustion of the blast furnace gas at the initial stage of combustion, and mainly use the calorific value of the blast furnace gas itself to heat the boiler until the stable combustion of the blast furnace gas is realized and the ignition is smooth; this ignition method uses The heat source is mainly blast furnace gas, which reduces the amount of fuel oil required for boiler startup and saves the ignition cost of the boiler.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of blast furnace gas burner ignition device of the present invention;

Fig. 2 is the schematic diagram of the front view structure of the blast furnace gas burner ignition device of the present invention;

Fig. 3 is a front structural schematic diagram of the oil gun igniter in the present invention.

In the figure: 1 blast furnace gas burner nozzle, 2 oil gun igniter, 3 fuel supply gun, 4 fuel oil, 5 air supply pipe, 6 combustion-supporting pure oxygen pipeline, 7 combustion stabilization cover, 8 pure oxygen cavity, 9 annular partition plate, 10 through holes.

detailed description

Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content of the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

Example 1

As shown in Figures 1, 2, and 3, a blast furnace gas burner ignition device includes a blast furnace gas burner nozzle 1 and an oil gun igniter 2, and the oil gun igniter 2 includes a fuel supply gun 3 and an air supply pipe 5 and a stable combustion cover 7, the fuel supply gun 3 in this embodiment is a gasification fuel spray gun, the fuel supply gun 3 is arranged at the axis of the blast furnace gas burner nozzle 1, and the air supply pipe 5 is coaxially sleeved on the Outside the fuel supply gun 3, the combustion stabilization cover 7 is arranged at the front end of the fuel supply gun 3, and the combustion stabilization cover 7 is connected with a combustion-supporting pure oxygen pipeline 6, which uses pure oxygen to increase the combustion temperature of the fuel oil and reduce the ignition temperature of the blast furnace gas. Finally, the synchronous ignition of blast furnace gas and fuel oil is realized, so that in the process of boiler heating to stable combustion, blast furnace gas also burns and generates heat, thus reducing fuel consumption.

In this embodiment, in order to stably and evenly supply pure oxygen for combustion, the combustion stabilization cover 7 is provided with a pure oxygen cavity 8, the pure oxygen cavity 8 is an annular cavity, and the pure oxygen cavity 8 is the same as The shaft sleeve is placed on the front end of the fuel supply gun 3, and the air outlet of the pure oxygen cavity 8 is separated from the combustion stabilization cover 7 by an annular partition 9, and there are a plurality of through holes 10 in an annular array on the annular partition 9, and the combustion-supporting The pure oxygen pipeline 6 communicates with the air inlet of the pure oxygen chamber 8 .

A method for igniting a blast furnace gas burner. A combustion flame port is provided to cover a fuel nozzle of the blast furnace gas burner nozzle. When the fuel is burning, pure oxygen is supplied to the blast furnace gas burner nozzle and the fuel nozzle to simultaneously ignite the blast furnace gas, and it is cut off after burning for a period of time. The fuel oil supply maintains the pure oxygen supply until the boiler temperature reaches the requirement for the stable combustion of blast furnace gas, then cuts off the pure oxygen supply, and finally realizes the smooth ignition of the boiler.

The whole ignition process is divided into the following stages

1) Add pure oxygen to assist the combustion of fuel oil

When the boiler is ignited and started, the fuel oil 4 used for ignition is ejected by the fuel supply gun 3, and the air required for the combustion of the fuel oil 4 is ejected by the air supply pipe 5 to provide the air required for combustion of the fuel oil. After the fuel oil 4 is ignited in the combustion-stabilizing hood 7, pure oxygen is sent into the combustion-stabilizing hood 7 from the pure oxygen cavity 8, and finally the combustion of the fuel oil 4 is promoted due to the addition of pure oxygen, forming a full-coverage at the nozzle 1 of the blast furnace gas burner. High temperature heat source for the nozzle.

Due to the addition of pure oxygen, the combustion intensity of the fuel oil is improved, and the temperature of the fuel combustion flame is higher, forming a sufficiently high-temperature heat source covering the entire nozzle at the nozzle of the blast furnace gas burner, which is conducive to igniting the blast furnace gas with low calorific value;

2) Blast furnace gas combustion

After a continuous high-temperature heat source covering the entire nozzle is formed at the nozzle 1 of the blast furnace gas burner, the blast furnace gas and air can be quickly ignited in the nozzle 1 of the blast furnace gas burner when the blast furnace gas and air are ejected from the grill nozzle of the blast furnace gas burner. The heat generated by the combustion of gas is combined with fuel to increase the temperature of the boiler;

3) Late stage of ignition

As the blast furnace gas burns for a certain period of time, the furnace temperature of the boiler rises. When the furnace temperature reaches about 700 ^o C, the input of fuel oil 4 is stopped, and the blast furnace gas is directly ignited by the high-temperature flue gas blanket, and at the same time, it relies on the continuous addition of pure oxygen. , improve the combustion stability of the blast furnace gas, and finally cut off the supply of pure oxygen after reaching the ignition temperature of the blast furnace gas, so that the boiler can be ignited smoothly.

Claims (4)

1. a blast furnace gas burner ignition device, comprising blast furnace gas burner spout (1) and oil gun igniter (2), is characterized in that, described oil gun igniter (2) comprises: A fuel oil supply gun (3) arranged at the axis of the blast furnace gas burner nozzle (1); The air supply pipe (5) coaxially set outside the fuel supply gun (3); The combustion stabilization cover (7) arranged at the front end of the fuel supply gun (3); The combustion stabilization hood (7) communicates with the combustion-supporting pure oxygen pipeline (6). 2. The blast furnace gas burner ignition device as claimed in claim 1, characterized in that: said combustion stabilization cover (7) is provided with a pure oxygen cavity (8), and said pure oxygen cavity (8) is annular The cavity, the pure oxygen cavity (8) is coaxially set on the front end of the fuel supply gun (3), and the gas outlet of the pure oxygen cavity (8) is separated from the stable combustion cover (7) by an annular partition (9) , the annular partition (9) has a plurality of through holes (10) in the annular array, and the combustion-supporting pure oxygen pipeline (6) communicates with the air inlet of the pure oxygen chamber (8). 3. The blast furnace gas burner ignition device according to claim 1 or 2, characterized in that: the fuel supply gun (3) is a gasification fuel spray gun. 4. A blast furnace gas burner ignition method is characterized in that: a combustion flame port is set to cover the fuel nozzle of the blast furnace gas burner nozzle, and when the fuel oil burns, pure oxygen is fed to the blast furnace gas burner nozzle and the fuel nozzle to ignite the blast furnace gas simultaneously After a period of combustion, cut off the fuel supply and maintain the pure oxygen supply until the boiler temperature reaches the requirements for stable combustion of blast furnace gas, cut off the pure oxygen supply, and finally realize the smooth ignition of the boiler.