CN2511874Y

CN2511874Y - Heat storing burner for blast furnace gas

Info

Publication number: CN2511874Y
Application number: CN 01276401
Authority: CN
Inventors: 饶文涛; 杜军; 许永贵
Original assignee: Baoshan Iron and Steel Co Ltd
Current assignee: Baoshan Iron and Steel Co Ltd
Priority date: 2001-12-29
Filing date: 2001-12-29
Publication date: 2002-09-18
Anticipated expiration: 2011-12-29

Abstract

The utility model relates to a heat storing burner for blast furnace gas. At least two pairs of combustion-supporting airways are symmetrically arranged surrounding the airway of blast furnace gas and the center of the burner. The distance of nozzle of every combustion-supporting airway and the central airway nozzle of blast furnace gas is not equal. The axle line of the combustion-supporting airway which is farer from the airway of the central blast furnace gas shows a radial shape. The oblique angle of the axle wire is ranged from 5 degrees to 20 degrees. The mixing of the combustion-supporting air and the furnace gas is retarded to reach grading burning. Two heat storing bodies are respectively arranged on the inlets of the combustion-supporting airway and the airway of the central blast furnace gas. The heat storing body is used to absorb the heat of smoke and preheat the gas and the air. The utility model is of simple structure, lower cost, effective energy saving and environment protection.

Description

A kind of heat-accumulating burner of burning blast furnace gas

Technical field

The utility model relates to a kind of heat-accumulating burner of burning blast furnace gas.

Background technology

The calorific value of blast furnace gas is lower, directly be used for burning and satisfy the requirement of heating process, minority iron and steel enterprise with good conditionsi is blast furnace gas and other high heating value combustion gas such as coke-stove gas, the blending utilization of burning, or directly other Fuel Furnace of spirt as auxiliary fuel; But those do not possess the iron and steel enterprise of the condition utilized, then often directly emptying diffuse burning, therefore annual and cause energy waste to reach 900,000 tons of standard coals, and severe contamination environment.

The double pre-heating heat accumulation type stove of domestic use can use blast furnace gas, heats combustion air and combustion gas by utilizing fume afterheat, improves the theoretical temperature combustion of combustion gas, satisfies smooth combustion and heating process requirement.But do not have nozzle structure, have only combustion gas spout and air port, both are arranged in parallel or arranged crosswise, and more than combustion air and the gas-preheating to 800 ℃, temperature is higher in the stove, and formation of nitrogen oxides is big, consumes energy and contaminated environment.The FDI type burner of Japan adopts a plurality of little spout high-speed jet injection inner flue gas of the stove principles, and the oxygen concentration of combustion gas combustion air before catching fire is reduced, and reaches the purpose that reduces formation of nitrogen oxides.But FDI type burner is applicable to the high heating value combustion gas, is not suitable for low-calorie blast furnace gas.

Summary of the invention

The purpose of this utility model provides a kind of heat-accumulating burner of burning blast furnace gas, and it not only is fit to low-calorie blast furnace gas, and the optimization by nozzle structure, has reduced the growing amount of nitrogen oxide, thus energy savings, the protection environment.

For achieving the above object, around the blast furnace gas air flue of the center of burner, be symmetrical arranged at least two pairs of combustion air air flues, the distance of the every pair of combustion air air flue spout and center blast furnace gas air flue spout does not wait.

The axis of the combustion air air flue that described distance center blast furnace gas air flue is far away is radial.

Outward-dipping 5 °～20 ° of the axis of the combustion air air flue that described distance center blast furnace gas air flue is far away.Make in time and blast furnace gas mixed combustion, and, reach the fractional combustion purpose from of the postponement that mixes of the decentre jet opening distance air that spout sprayed far away with blast furnace gas from the nearer air that spout sprayed of decentre jet opening distance.

In combustion air air flue and blast furnace gas air flue porch, center, heat storage is set respectively.In order to absorb heat, preheating gas and the air of flue gas.Thereby the reduction exhaust gas temperature guarantees ignition temperature, makes blast furnace gas smooth combustion under low-oxygen environment, reduces the growing amount of nitrogen oxide, satisfies the heating process requirement of heating furnace.

Because the calorific value of blast furnace gas is lower, the relative high heating value combustion gas of required combustion-supporting air quantity is few, and a warm-up combustion-supporting air can't all absorb smoke discharging residual heat, thereby exhaust gas temperature is increased, and the thermal efficiency reduces; Adopt the utility model, preheated air, coal gas can reduce exhaust gas temperature simultaneously; improve theoretical temperature combustion, stable ignition makes the blast furnace gas can smooth combustion under lower oxygen concentration; and reduce the growing amount of nitrogen oxide, thus energy savings, the protection environment.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is that the A-A of Fig. 1 is to profile;

Fig. 3 is that the B-B of Fig. 1 is to profile.Drawing reference numeral explanation: 1 center blast furnace gas spout, 2,3,4,5 combustion air spouts, 6 heat storages

The specific embodiment

As shown in Figure 1, be symmetrical arranged at least two pairs of combustion air air flues around the blast furnace gas air flue of the center of burner, the distance of the every pair of combustion air

air flue spout

2,3,4,5 and center blast furnace gas air flue spout 1 does not wait.

As Fig. 2, shown in Figure 3, spout 2,4 distance center spouts 1 are two spouts 3 relatively in addition, 5 want near, and the air flue central axis of No. 3 and No. 5 spouts is radial, its outward-dipping angle is 5 °～20 °, can postpone like this from spout 3 and the combustion air of 5 ejections and mixing of blast furnace gas, make spout 2 and 4 air that sprayed and the abundant mixed combustion of blast furnace gas, and the postponement that mixes of

spout

3 and 5 air that sprayed and blast furnace gas, thereby reach the purpose of the two preheatings of fractional combustion, improve theoretical temperature combustion, stable ignition is realized high-temperature and low-oxygen combustion, thereby reduces the growing amount of nitrogen oxide.Corresponding to 5 ° of air jet inclination angle, 10 °, 15 °, 20 ° the time, the ppm value of the nitrogen oxide that the exit generates is respectively 103.7,141.8, and 125.9 and 165.8, can see that the formation of nitrogen oxides in this scope can remain on below the 170ppm.

The muzzle velocity of blast furnace gas and air is 40～60m/s, and temperature is more than 800 ℃, and theoretical temperature combustion is higher than 1500 ℃.Heat storage 6 is set, in order to absorb the heat of flue gas, storage temperature around spout.Thereby the reduction exhaust gas temperature guarantees ignition temperature, makes blast furnace gas smooth combustion under low-oxygen environment, reduces the growing amount of nitrogen oxide, satisfies the heating process requirement of heating furnace.Through experimental analysis, the thermal efficiency of stove can be brought up to 81.5% from 62.2% behind application the utility model.

Claims

1. the heat-accumulating burner of a burning blast furnace gas is symmetrical arranged at least two pairs of combustion air air flues around the blast furnace gas air flue of the center of burner, it is characterized in that, the distance of the every pair of combustion air air flue spout and center blast furnace gas air flue spout does not wait.

2. the heat-accumulating burner of burning blast furnace gas as claimed in claim 1 is characterized in that, the axis of the combustion air air flue that described distance center blast furnace gas air flue is far away is radial.

3. the heat-accumulating burner of burning blast furnace gas as claimed in claim 2 is characterized in that, outward-dipping 5 °～20 ° of the axis of the combustion air air flue that described distance center blast furnace gas air flue is far away.

4. as the heat-accumulating burner of the described blast furnace gas of claim 1,2 or 3, it is characterized in that,, heat storage is set respectively in combustion air air flue and blast furnace gas air flue porch, center.