CN201313912Y - A burner for a top-fired hot blast stove - Google Patents

Abstract

The utility model provides a burner of a top-combustion hot-blast stove. The burner mainly comprises an air inlet (1), a gas inlet (5), an air loop (2), a gas loop (6), air nozzles (3), gas nozzles (7), a pre-combustion chamber (9) and vaults (8), and the burner is characterized in that masonry bricks of the air inlet (1), the gas inlet (5), the loop vaults and the vault of the pre-combustion chamber are combined bricks, and the masonry bricks of the residual parts are special shaped bricks. The structural stability of the burner can be improved and the masonry time of the burner can be shortened; through the different designs of the angles of elevation angles between the adjacent air nozzles (3), air and gas are fully pre-mixed and are mixed during the combustion in the pre-combustion chamber, thereby leading high-temperature flue gas flow to enter a regenerator chamber of the hot-blast stove evenly, ensuring the stable combustion of a large-scale blast furnace hot-blast stove when the amount of gas is great and improving the combustion efficiency. The top-combustion hot-blast stove adopts the burner has more reasonable technical arrangement; the occupied space is small, the investment saved, the service life is prolonged, and the high blast temperature above 1250 DEG C for the blast furnace can be provided.

Description

A burner for a top-fired hot blast stove

technical field

The utility model relates to a burner of a top-burning hot blast stove, in particular to a rotary jet burner of a top-burning hot blast stove capable of burning a large amount of blast furnace gas.

Background technique

At present, blast furnace hot blast stoves are divided into three types: internal combustion type, external combustion type and top combustion type. The burners of the internal combustion and external combustion hot blast stoves are arranged in the lower part, and have an independent combustion chamber. The combustion chamber occupies a large area, requires a high investment in refractory materials and steel structures, and is difficult to construct. The structure of the burners is complex and there are many types of bricks. , the manufacturing cycle is long, and the masonry is difficult; moreover, several types of burners arranged in the lower part have different degrees of combustion pulsation when the gas volume is large, which reduces the life of the burner and directly affects production. Although the top-fired hot blast stove overcomes the above shortcomings, because most of the existing top-fired hot blast stove burners are built with standard bricks, there are problems such as difficult masonry, long cycle, poor structural stability, and short life. In addition, because the air nozzle elevation angle of the burner of the top-fired hot blast stove is either arranged horizontally or uniformly arranged at a certain angle, the air-gas premixing effect is poor and the combustion efficiency is low in the case of a large gas volume.

Contents of the invention

The purpose of this utility model is to provide a top-fired hot blast stove burner with simple structure and brick type, easy on-site masonry, low engineering investment, and short construction period, so as to solve the problem of poor air gas premixing effect under the condition of large gas volume. Poor, the problem of low combustion efficiency.

The purpose of this utility model is achieved in the following way: a burner for a top-fired hot blast stove mainly includes an air and gas inlet, an air and gas ring, an air and gas nozzle, a pre-combustion chamber and a vault, and is characterized in that: The masonry bricks of the entrance, gas inlet, loop vault and pre-combustion chamber are composite bricks, and the rest of the masonry bricks are special-shaped bricks. The elevation angles between adjacent air nozzles are different, and the composite bricks and Special-shaped bricks are made of andalusite-mullite. Air and gas enter their respective rings from the air and gas inlets respectively, and then enter the pre-combustion chamber through their respective rotary cutting jet nozzles at different elevation and rotary cutting angles, and burn while fully and evenly mixing to store heat for the hot blast stove Chamber checker bricks provide uniform high-temperature flue gas.

Because the utility model adopts combined bricks and special-shaped bricks for masonry, it solves the problem of traditional hot blast stoves with large floor area, high initial investment, complex brick type, high manufacturing difficulty, high difficulty in masonry, and burning when the hot blast stove operates with a large amount of gas. Instability and other disadvantages. Compared with the existing technology, it can improve the structural stability of the burner, shorten the masonry time of the burner, and ensure the stable combustion of the large-scale blast furnace hot blast stove when the gas volume is large; through the staggered arrangement of the air nozzle elevation angle, the air and gas can be fully Premixing, burning while mixing in the pre-combustion chamber, so that the high-temperature flue gas flow evenly enters the regenerator of the hot blast stove. The technological layout of the top-burning hot blast stove of the utility model is more reasonable, the furnace construction period is effectively shortened, the service life and work efficiency of the equipment are greatly improved, and the production cost of the hot blast stove operation is reduced. The life span can reach 25-30 years.

Description of drawings

Fig. 1 is the structural representation of the utility model top-fired hot blast stove burner;

Fig. 2 is a sectional view of the air loop of the burner of the utility model top-fired hot blast stove;

Fig. 3 is a sectional view of the gas loop of the burner of the top-fired hot blast stove of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

As shown in Figures 1, 2, and 3, a burner for a top-fired hot blast stove mainly includes an air inlet 1, a gas inlet 5, an air ring 2, a gas ring 6, an air nozzle 3, a gas nozzle 7, a pre-combustion Chamber 9 and vault 8 are characterized in that: the masonry bricks of air inlet 1, gas inlet 5, ring road vault and pre-combustion chamber vault are composite bricks, and the remaining parts such as pre-combustion chamber partition wall 10, air ring Partition wall 11 in the road, outer partition wall 12 of air loop, loop partition wall 4, inner partition wall 13 of gas loop, outer partition wall 14 of gas loop, air spout 3, the masonry brick type of gas spout 7 are special-shaped bricks.

A number of air nozzles 3 are correspondingly arranged on the inner partition wall 11 of the air ring 2 and the combustion chamber partition wall 10, and different elevation angles are set between adjacent air nozzles 3; the inner partition wall 13 of the gas ring road 6 and the combustion chamber partition wall 10 Several gas nozzles 7 are correspondingly arranged on the top, and different rotary cutting angles are set between adjacent gas nozzles 7 .

The air and gas enter the air ring 2 and the gas ring 6 through the air inlet 1 and the gas inlet 5 respectively, and then enter the pre-heater at different angles (5-25°) through the rotary cutting jet nozzles 3 and 7 of the air and gas. The combustion chamber 9 is fully and evenly mixed while burning, and provides uniform high-temperature flue gas to the checker bricks in the regenerator of the hot blast stove.

The air inlet combination brick, the gas inlet combination brick, the air loop vault combination brick, the gas loop vault combination brick, and the combustion chamber vault combination brick are pre-cut and numbered and packed in the factory, and are not allowed Processing of bricks at the masonry site.

The refractory material of the utility model uses andalusite-mullite brick, whose thermal shock stability (1100°C water cooling) is ≥110 times, and is built with corundum mud.

The burner of the utility model is arranged on the upper part of the hot blast stove vault, supported by independent brick rings and arch feet, and has no relationship with the hot blast stove vault, so as to ensure that its structure is not affected by hot blast stove combustion, partition, air supply, etc. Influence of work status.

The burner of the utility model is suitable for 300m ³ -5000m ³ blast furnace hot blast stoves, the gas combustion volume is from 10000Nm ³ to 140000Nm ³ , and it is suitable for various forms of air and gas double preheating process (the temperature difference between air and gas is 0 ~ 400 ℃) , to ensure that the hot blast stove provides an air temperature above 1250°C.

Claims (5)

1. A burner for a top-fired hot blast stove, mainly comprising air and gas inlets (1, 5), air and gas loops (2, 6), air and gas nozzles (3, 7), pre-combustion chamber (9 ) and vault (8), characterized in that: the masonry bricks of the air inlet (1), the gas inlet (5), the loop vault and the pre-combustion chamber vault are composite bricks, and the masonry bricks of the remaining parts are For special-shaped bricks. 2. The burner of the top-fired hot blast stove according to claim 1, characterized in that: the elevation angles between adjacent air nozzles (3) are different. 3. The burner of the top-fired hot blast stove according to claim 1 or 2, characterized in that the composite brick and the special-shaped brick are made of andalusite-mullite. 4. The burner of the top-fired hot blast stove according to claim 2, characterized in that the rotary angles between adjacent gas nozzles (7) are different. 5. The burner of the top-fired hot blast stove according to claim 1 or 2, characterized in that the angle between the elevation angle of the air nozzle (3) and the rotary cutting angle of the gas nozzle (7) is 5-25°.

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