CN200988859Y - Oxygen bottom blowing melting furnace - Google Patents

Abstract

The utility model oxygen bottom-blown smelting furnace provides a new high-efficiency and energy-saving smelting furnace. The bottom of the furnace body is provided with several oxygen gun ports, and the oxygen gun ports are provided with an oxygen lance device. The oxygen lance device consists of an outer layer The casing and several inner layer casings are sleeved together. The several inner layer casings are nested in sequence. There are a number of ventilation grooves on the outside of the inner layer casing. A through hole is formed in the center of the inner layer casing. This new type The smelting furnace reasonably organizes the ventilation volume on the channels of each layer, and maintains a reasonable high air velocity, significantly reduces the oxygen supply pressure, and is conducive to the intense and efficient chemical reaction.

Description

Oxygen bottom-blown melting furnace

technical field

The utility model relates to metallurgical equipment used in the metallurgical industry, in particular to a novel melting furnace.

Background technique

Traditional lead smelting processes mainly include sintering pot-blast furnace process and sintering machine-blast furnace process. These two methods mainly use the method of sintering the lead concentrate to reduce and smelt through the blast furnace. The sintering pot-blast furnace process has serious environmental protection problems in production and application. The SO2 flue gas generated during the sintering process is completely emptied because it cannot be recycled, causing serious pollution to the atmospheric environment. At the same time, a large number of powder returning operations during the sintering process have caused The low-altitude dispersion of lead fume brings environmental pollution of lead fume. Sintering machine-blast furnace process, the output flue gas SO ₂ content is low, the actual production conversion rate in the acid production process commonly used in China is only about 80%, the tail gas emission still does not meet the environmental protection requirements, and the quality of sulfuric acid products is not high. There is TOPSOE acid production technology in foreign countries, but the technical software and hardware are expensive and economically unreasonable, and this process also has the problem of low-altitude dispersion of lead fumes caused by a large number of dust-returning operations during the sintering process, and the environmental protection problem still cannot be solved. In addition, in these two sintering methods, the oxidation reaction heat generated during the sintering process cannot be recycled, and the energy consumption of the smelting process is high. At present, there are more mature and advanced lead smelting processes in foreign countries, such as Kivicet method, QSL method, and top-blowing immersion smelting method. poor.

Utility model content

In practice, oxygen bottom-blown smelting furnaces are playing an increasingly important role in lead smelting and copper smelting, especially in the field of lead smelting, which has achieved remarkable results. Oxygen bottom-blown smelting furnace is a major improvement to the traditional lead (copper) smelting process.

The purpose of this utility model is to provide an oxygen bottom-blown smelting furnace with an oxygen lance device, so that the current oxygen bottom-blown smelting process has the outstanding advantages of low energy consumption, less pollution, and good operating environment.

The technical solution adopted by the oxygen bottom-blowing smelting furnace of the present utility model is:

An oxygen bottom blowing smelting furnace, comprising a furnace body, the bottom of the furnace body is provided with several oxygen lance ports, and the oxygen lance ports are provided with an oxygen lance device;

Wherein, the oxygen lance device is composed of an outer layer sleeve and several inner layer sleeves, and the several inner layer sleeves are nested sequentially. There are several ventilation grooves on the outside of the inner layer sleeve. A through hole is formed in the center of the tube;

Wherein, the cross-sectional areas of the ventilation grooves of each inner casing are different from each other;

Wherein, the number of ventilation grooves of each inner casing is different from each other;

Wherein, the number of the several inner casings is 2 to 5;

Wherein, the oxygen lance is set at -30°～+30° on the center line of the furnace bottom;

Wherein, the oxygen muzzle is arranged in a single row;

Among them, the oxygen muzzle is set in double rows;

By installing an oxygen lance device on the oxygen lance port at the bottom of the oxygen bottom-blown smelting furnace, oxygen is injected from the bottom of the molten pool in the furnace, so that the melt in the furnace is in a state of violent tumbling and stirring. It makes the chemical reaction speed more intense, the reaction is complete, and the chemical reaction rate is greatly improved. The optimized muzzle design makes the service life of the furnace longer and economical and reasonable, effectively overcoming the short service life of the existing oxygen lance device and the need for Disadvantages such as high oxygen pressure, low operating rate, and large power consumption.

Description of drawings

Fig. 1 is the front view of the utility model oxygen bottom blowing smelting furnace;

Fig. 2 is the side view of the utility model oxygen bottom blowing smelting furnace;

Fig. 3 is the installation position diagram of the oxygen muzzle of the oxygen bottom blowing smelting furnace of the present utility model;

Fig. 4 is a schematic cross-sectional structure diagram of the oxygen lance device of the oxygen bottom blowing smelting furnace of the present invention.

Detailed ways

The utility model oxygen bottom-blown smelting furnace is the core equipment of the oxygen bottom-blown smelting process, as shown in Fig. components, where the transmission a is connected to the generator 1. Furnace body 10 is a horizontal cylindrical shape, and high-quality magnesia-chrome bricks are built in the steel shell, which can be rotated at any angle as required. The support device b can meet the needs of the furnace body 10 rotation and thermal expansion and contraction. The upper part is provided with a smoke outlet 4 and a feeding port 5. The smoke outlet device of this oxygen bottom blowing smelting furnace has a special design structure. During use No smoke leakage, no lumpy sticking. Even in the process of rotating the furnace body, there is no leakage of smoke from the smoke outlet. This is due to the rational design of the smoke outlet structure and the effect of the fixedly connected banana cover. The lack of block-like adhesion at the smoke outlet is mainly because the method of avoiding agglomeration has been fully considered in the design and the water jacket of good material is used as the flue gas channel, so that no agglomeration can be formed on the inner surface of the smoke outlet. One end of the furnace body is provided with a slag discharge port 8 and the other end is provided with a metal discharge port 2 and an oxygen oil burner port 3 . The smoke outlet 4 on the top is connected with the smoke hood. There is a burner 7 at each end. The burner at the slag outlet is used for heating up the furnace, temporary heat preservation and heat supply to the furnace body. The burner at the other end is mainly used for thermal boiler direct heating. The flue, its possible agglomerates fall into the furnace, where it is melted with this burner. In addition, an oxygen oil burner port is provided at one end of the furnace body 10 , and a material detection port 6 is provided at the upper part.

The key points of the present utility model are: several oxygen muzzles 9 are arranged on the furnace body 10, and the oxygen muzzles are arranged between -30°～+30° on the center line of the furnace bottom, and are usually arranged in double rows. It can also be arranged in a single row if required, and there is an oxygen lance device 11 inside the oxygen lance.

As shown in Figure 4, the oxygen device 11 is composed of an outer sleeve 111 and an inner sleeve, the inner sleeve is composed of a first inner sleeve 121, a second inner sleeve 122 and a third inner sleeve. The inner casing 123 is composed of a through hole 13 formed in the center of each casing, on which a first ventilation groove 124, a second ventilation groove 125, and a third ventilation groove 126 are correspondingly provided. The cross-sectional area of each ventilation groove is different, and The number of ventilation grooves provided in each inner casing is also different according to the needs of the reaction, so as to ensure the supply of different amounts of gas and reasonably distribute the ventilation volume of each layer of channels. Usually, the first ventilation groove 124 is nitrogen and water mist The channels, the second vent slot 125, the third vent slot 126 and the central through hole deliver oxygen.

The prepared charge is thrown into the furnace through the charging port 5 on the top of the furnace or the throwing machine at the end, and scattered on the surface of the molten pool. Oxygen is injected from the bottom of the molten pool in the furnace through an oxygen lance, so that the melt in the furnace is in a state of violent tumbling and stirring. The charge falling into the molten pool is quickly engulfed and melted by the melt, so a sharp chemical reaction occurs to form metal (or matte) and slag. The formed product settles and separates in the settling zone due to its different gravity to form a metal layer and a slag layer, which are released from different outlets respectively. The oxygen bottom-blown smelting process is an autothermal reaction process.

The physical and chemical reactions are more complete and complete, which is conducive to the intense and efficient chemical reactions. The smelting process of the oxygen bottom-blown smelting furnace is carried out in an almost completely sealed state, so the flue gas with a high concentration of sulfur dioxide can be obtained to facilitate acid treatment, and at the same time, the workshop environment can meet the good environmental protection requirements of no smoke and less dust. Due to the optimized design of the muzzle, the life of the furnace is guaranteed to be increased and the economy is reasonable. In addition, because the number and area of the ventilation grooves on the outside of each inner casing are different, the ventilation volume of each layer of channels is reasonably organized, and a reasonable high air velocity is maintained. At the same time, the air flow is relatively dispersed, and the reaction area between the gas and the solution is increased. , which is conducive to the intense and efficient chemical reaction, so that the oxygen supply pressure is significantly reduced. Specifically speaking from the data: the service life of the oxygen lance of the present utility model can generally reach more than 30 days, which greatly improves the operation rate of the oxygen bottom blowing smelting furnace. In addition, the oxygen pressure used by the oxygen lance device of the present utility model is only (0.6-0.8MPa) greatly reduces power consumption, the utility model oxygen bottom blowing melting furnace is a new type of high-efficiency melting furnace.

Claims (8)

1, a kind of oxygen bottom-blowing stove includes shaft, it is characterized in that: this shaft bottom is provided with several oxygen muzzle, and this oxygen muzzle place is provided with the oxygen gun apparatus.

2, oxygen bottom-blowing stove as claimed in claim 1, it is characterized in that: this oxygen gun apparatus is formed by outer layer sleeve, several inner layer sleeve fits, these several inner layer sleeves are nested successively, and this inner layer sleeve outside is provided with some air channels, and this inner layer sleeve center is formed with through hole.

3, oxygen bottom-blowing stove as claimed in claim 2, it is characterized in that: the section area of the air channel of this each inner layer sleeve is different.

4, oxygen bottom-blowing stove as claimed in claim 2, it is characterized in that: the quantity of the air channel of this each inner layer sleeve is different.

5, oxygen bottom-blowing stove as claimed in claim 2 is characterized in that: the number of these several inner layer sleeves is 2～5.

6, oxygen bottom-blowing stove as claimed in claim 1 is characterized in that: this oxygen muzzle is arranged on furnace bottom medullary ray-30 °～+ 30 °.

7, oxygen bottom-blowing stove as claimed in claim 1 is characterized in that: this oxygen muzzle is single setting.

8, oxygen bottom-blowing stove as claimed in claim 1 is characterized in that: this oxygen muzzle is double setting.

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