Oven drying device of top combustion type hot blast stove

Abstract

The utility model provides a top combustion type hot blast stove oven device which is arranged on the outer side of the upper portion of a mixing chamber and comprises a coal gas transverse pipe communicated with a coal gas loop on the side wall of a combustor, the coal gas transverse pipe is connected with a coal gas vertical pipe used for conveying fuel, and a sealing plate is arranged at the end, away from the combustor, of the coal gas transverse pipe. A furnace drying device used for drying a furnace is installed on the sealing plate and supported on the operation table through a supporting column. The oven device solves the problems that an existing oven device of the top combustion type hot blast stove is unreasonable in arrangement, and refractory materials of a burner cannot be effectively baked, the oven device can guarantee that refractory bricks and slurry of the burner are effectively baked and sintered into a whole, and the lining structure of the refractory materials is firmer after the hot blast stove is put into production.

Description

Technical Field

[0001] The utility model relates to the field of metallurgy and thermal energy engineering equipment, in particular to a top-burning hot blast furnace drying device. Background Art

[0002] After the hot blast furnace for metallurgical blast furnace is built or overhauled, the pressure test is successful and the furnace should be dried before it is put into use. The purpose of drying the furnace is: (1) Before it is put into use, the moisture accumulated during the masonry wall is slowly removed and the refractory mud is fully sintered to avoid the phenomenon of cracks or deformation of the furnace lining and cracking and collapse of the furnace wall due to the rapid temperature rise in the furnace, large amount of water vaporization and volume expansion when the hot blast furnace equipment is fired; (2) The equipment, process pipelines and automatic control system of the hot blast furnace system are tested for heat load; (3) The heat is gradually accumulated in the hot blast furnace to ensure the air temperature required for the blast furnace drying and opening. (4) The thermal expansion does not affect the stability of the masonry. The heating process should be carried out slowly, especially for hot blast furnaces using silica bricks. During the crystal transformation process of the residual quartz in the silica bricks, its expansion coefficient is large, resulting in the weakening of the silica bricks. If the heating is unreasonable, it is very easy to damage the masonry and affect the service life of the hot blast furnace. Therefore, strict requirements are imposed on the hot blast furnace from the furnace device to the formulation of the heating method and the control of the heating curve.

[0003] At present, the traditional method of baking furnaces is to set a temporary baking furnace device in the ignition manhole of the combustion chamber, and burn coal gas or natural gas and other fuels. The main disadvantages are as follows: (1) The refractory masonry inside the ignition manhole of the combustion chamber of the top-burning hot blast furnace is made of siliceous material. Silica bricks have unstable state variants in different temperature ranges. When baking silica bricks in the hot blast furnace, the temperature range of 180-300℃ and 500-600℃ needs to slow down the heating rate so that the silica bricks have sufficient expansion time. The baking furnace device can only reduce the temperature in the furnace by increasing the air supply in the early stage, which causes the combustion flame to be too long and damages the silica lining. Through a large number of cases, it was found that the refractory lining around the baking furnace device had large-scale peeling and damage. (2) The ignition hole of the combustion chamber of the top-burning hot blast furnace is located in the middle of the hot blast furnace. Due to the siphon effect of the chimney, during the combustion process of the furnace device, the hot flue gas generated by the flame enters the heat storage body for heat exchange and absorption, and the low-temperature flue gas is discharged through the chimney. As a result, the refractory masonry of the hot blast furnace burner located at the top of the hot blast furnace cannot be effectively baked, and the refractory material and mud are not sintered. As a result, after the hot blast furnace is put into production, the refractory lining of the top burner slides or even falls off. (3) After the furnace is baked, the temporary furnace device needs to be dismantled. This method makes the installation and dismantling of the furnace device troublesome, and the heat loss of the hot blast furnace is large. If the hot blast furnace needs to be repaired or resumed after suspension, the furnace device needs to be installed again.

[0004] In view of this, it is necessary to design a new type of top-burning hot blast furnace device to solve the problems existing in the prior art. Utility Model Content

[0005] In order to solve the deficiencies in the prior art, the utility model provides a top-burning hot blast furnace baking device, which solves the problem that the existing top-burning hot blast furnace baking device is unreasonable in setting and the burner refractory material cannot be effectively baked. The baking device can ensure that the burner refractory bricks and mud are effectively baked and sintered into one. After the hot blast furnace is put into production, the refractory material lining structure is more solid.

[0006] In order to achieve the above purpose, the specific solution adopted by the utility model is:

[0007] A top-fired hot blast furnace drying device, the hot blast furnace comprising a burner, the burner comprising a combustion chamber and a mixing chamber, a gas annular channel and a combustion-supporting air annular channel provided in the side wall of the mixing chamber, the gas annular channel provided with a gas nozzle communicating with the inner cavity of the mixing chamber, and the combustion-supporting air annular channel provided with a combustion-supporting air nozzle communicating with the inner cavity of the mixing chamber; a drying device provided on the upper outer side of the mixing chamber, comprising a gas cross pipe communicating with the gas annular channel, a sealing plate provided at one end of the gas cross pipe away from the burner, a drying device for drying the furnace mounted on the sealing plate, and the drying device supported on an operating table by pillars;

[0008] The gas horizontal pipe is connected to a gas vertical pipe for transporting fuel, and the gas vertical pipe is fixed on the side wall of the burner.

[0009] Furthermore, the sealing plate is provided with a circular hole that cooperates with the drying oven, and the diameter of the circular hole is 350-600 mm.

[0010] Furthermore, the oven drying device uses coke oven gas as fuel.

[0011] Furthermore, the operating table is horizontally arranged on the outer wall of the burner.

[0012] Beneficial effects:

[0013] (1) The furnace drying device of the present invention includes a gas horizontal pipe, a gas vertical pipe, a sealing plate, a furnace drying device, and an operating table. By arranging the gas horizontal pipe with a matching sealing plate and an operating table, the furnace drying device connected to the gas horizontal pipe burns the fuel input from the gas vertical pipe to generate heat, which passes through the gas ring channel and the gas nozzle to reach the mixing chamber, forming a vortex high-temperature (temperature less than 1000°C) airflow in the inner cavity of the mixing chamber. The high-temperature flue gas flows in the mixing chamber from top to bottom and from inside to outside, baking the refractory materials in various parts of the top-fired hot blast furnace burner. At the same time, part of the high-temperature flue gas can enter the combustion air nozzle and bake the refractory materials inside the combustion air ring channel. The high-temperature flue gas in the inner cavity of the mixing chamber rotates downward and enters the combustion chamber and the heat storage chamber, and is discharged from the exhaust gas outlet. The furnace drying device can ensure that the burner refractory bricks and mud are effectively baked and sintered into one. After the hot blast furnace is put into production, the refractory material lining structure is more solid.

[0014] (2) The furnace drying device is a standing device and does not need to be dismantled after the furnace drying is completed. During the blast furnace shutdown period, coke oven gas or other fuels can be used to burn the furnace drying device to keep the refractory materials in the furnace within a certain temperature, thus solving the problem of the refractory materials needing to be kept warm when the hot blast furnace is kept in the furnace for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the drying furnace device in the present utility model.

[0016] Graphic markings: 1. Regenerator, 2. Combustion chamber manhole, 3. Combustion chamber, 4. Mixing chamber, 5. Combustion air nozzle, 6. Combustion air ring, 7. Gas ring, 8. Gas nozzle, 9. Gas cross pipe, 10. Sealing plate, 11. Oven drying device, 12. Operating table, 13. Gas vertical pipe, 14. Exhaust gas outlet. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions of the present invention in conjunction with specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "upper" and "lower" etc. indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0019] It should be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0020] like Figure 1 As shown, the utility model discloses a top-burning hot blast furnace drying device. First, the structure of the hot blast furnace is roughly described. The hot blast furnace includes a burner, and the burner includes a mixing chamber 4 and a combustion chamber 3. The combustion chamber 3 is provided with a combustion chamber manhole 2; the mixing chamber 4 is provided with a combustion air annulus 6 and a gas annulus 7, the combustion air annulus 6 is provided with a combustion air nozzle 5 connected to the inner cavity of the mixing chamber 4, and the gas annulus 7 is provided with a gas nozzle 8 connected to the inner cavity of the mixing chamber 4. The specific structure of the drying device arranged on the upper part of the mixing chamber is described below. The drying device includes a gas cross pipe 9 connected to the gas annulus 7 on the side wall of the burner, and the gas cross pipe 9 is connected to a gas vertical pipe 13 for transporting fuel, and the gas vertical pipe 13 is fixed to the side wall of the burner. The end of the gas cross pipe 9 away from the burner is provided with a sealing plate 10, on which a furnace drying device 11 for drying the furnace is installed. The furnace drying device 11 is supported on an operating table 12 by a support, and the operating table 12 is horizontally arranged on the outer wall of the burner. The furnace drying device in the utility model is provided with a furnace drying device 11 at the end of the gas cross pipe 9. The furnace drying device 11 is a burner for drying the furnace. Coke oven gas or other fuel is used as fuel and is input into the gas cross pipe 9 from a gas vertical pipe 13. The heat generated by the combustion of the fuel by the furnace drying device 11 enters the gas annulus 7 through the gas branch pipe 9. The high-temperature flue gas passing through the gas annulus 7 passes through the gas nozzle 8 and forms a vortex high-temperature airflow (temperature less than 1000°C) in the inner cavity of the mixing chamber 4. The high-temperature flue gas flows from top to bottom and from inside to outside in the mixing chamber 4, baking the refractory materials in various parts of the mixing chamber 4 of the top-fired hot blast furnace. Some of the high-temperature flue gas enters the combustion air nozzle 5, baking the refractory material within the combustion air annulus 6. The high-temperature flue gas within the mixing chamber 4 rotates downward, enters the combustion chamber 3 and the regenerator 1, and is discharged through the exhaust gas outlet 14. The oven baking device of the present invention ensures that all parts of the burner are effectively baked.

[0021] Specifically, the sealing plate 10 is provided with a circular hole that cooperates with the drying oven 11 , and the diameter of the circular hole is 350-600 mm.

[0022] The oven drying device of the present invention is arranged on the upper part of the burner of the hot blast furnace. The oven drying device is a standing device and does not need to be removed after the oven drying is completed. During the shutdown phase of the blast furnace, coke oven gas or other fuel can be used to burn the oven drying device 11 to keep the refractory material in the furnace within a certain temperature, thus solving the problem of the hot blast furnace being kept in the furnace for a long time and the refractory material needing to be kept warm.

[0023] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any equivalent changes or modifications made according to the essence of the present invention should be included in the scope of protection of the present invention.

Claims

1. A top-fired hot blast furnace drying device, the hot blast furnace comprising a burner, the burner comprising a combustion chamber (3) and a mixing chamber (4), a gas annular channel (7) and a combustion-supporting air annular channel (6) being provided in the side wall of the mixing chamber (4), a gas nozzle (8) being provided on the gas annular channel (7) being communicated with the inner cavity of the mixing chamber (4), and a combustion-supporting air nozzle (5) being provided on the combustion-supporting air annular channel (6) being communicated with the inner cavity of the mixing chamber (4); characterized in that: The furnace drying device is arranged on the upper outer side of the mixing chamber (4), and includes a gas cross pipe (9) connected to the gas ring channel (7). The end of the gas cross pipe (9) away from the burner is provided with a sealing plate (10). A furnace drying device (11) for drying the furnace is installed on the sealing plate (10). The furnace drying device (11) is supported on an operating table (12) by a support. The gas horizontal pipe (9) is connected to a gas vertical pipe (13) for transporting fuel, and the gas vertical pipe (13) is fixed on the side wall of the burner.

2. A top-fired hot blast furnace drying device according to claim 1, characterized in that: The sealing plate (10) is provided with a circular hole that cooperates with the drying oven (11), and the diameter of the circular hole is 350-600 mm.

3. A top-fired hot blast furnace drying device according to claim 1, characterized in that: The oven drying device (11) uses coke oven gas as fuel.

4. A top-fired hot blast furnace drying device according to claim 1, characterized in that: The operating table (12) is horizontally arranged on the outer wall of the burner.

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