Energy-saving structure of hot blast stove

Abstract

The utility model discloses an energy-saving structure of a hot blast stove, which relates to the technical field of light calcined magnesia production, and comprises a stove body, a feed port, an air inlet, a discharge port and an injection device, the stove body comprises a hot air chamber, a decomposition chamber and a hot air decomposition chamber, and the injection device is positioned in the hot air decomposition chamber and the hot air chamber and comprises an injection pipeline and a nozzle, four horizontally-surrounding injection pipelines are arranged in the hot air chamber, five hot air decomposition chambers are arranged, the temperature can be uniform, generation of nitric oxide is reduced, the activity of light calcined magnesia is improved, a nozzle is composed of an inner pipe and an outer pipe, a spiral blade is arranged at the end of the outer pipe, coal gas is introduced into the inner pipe, air is introduced into the outer pipe, and coal gas injection is driven through a side cyclone duct and central negative pressure. Pressurizing pressure of a gas pipeline and electricity consumption of a compressor are reduced; during working, air is in contact with magnesite after being preheated, the surface layer is crushed into powder, the powder reacts in the decomposition chamber to generate active caustic calcined magnesite, and the structure has the advantages of improving activity, reducing emission, reducing energy consumption and the like.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnesium oxide light-firing kilns, in particular to an energy-saving structure of a hot blast furnace. Background Art

[0002] Light-burned magnesium oxide, also known as calcined magnesia, is produced by calcining magnesite, brucite, or magnesium hydroxide extracted from seawater or brine at temperatures between 800°C and 1000°C, causing it to decompose and release carbon dioxide or water vapor. Light-burned magnesium oxide is widely used in a variety of fields, including building materials, chemicals, metallurgy, and medicine. It is an important raw material for the production of fireproof panels, lightweight partition boards, magnesium sulfate, papermaking, desulfurization processes, and steel mill slag protection. Lightly burned magnesium oxide is generally produced by calcining in a hot blast furnace. The hot blast furnace is divided into two parts, the upper and lower parts. The thicker part at the bottom is the hot blast chamber, which is generally composed of three injection pipe triangles to form an injection device. The three injection devices are arranged around the furnace body. The temperature of the hot blast chamber is about 1450℃. There is a nozzle at the end of the injection pipe. The nozzle is a double-layer structure. The outer structure is slightly longer than the inner structure. The outer edge shrinks to gather wind. The outer structure goes through gas and the inner structure goes through air. The material discharged from the discharge port reacts in the decomposition chamber. The temperature of the decomposition chamber is about 1200℃. The high temperature leads to a high nitrogen oxide content at the outlet of the hot blast furnace, while the low temperature will lead to insufficient purity of magnesium oxide. How to produce magnesium oxide in an environmentally friendly and efficient way is an urgent problem to be solved.

[0003] Therefore, in order to solve the problems existing in the existing hot blast furnace, it is necessary to improve and optimize it. By improving the structural design and rationally arranging the internal structure, the quality of light-burned magnesia can be improved, energy consumption can be reduced, the generation of pollutants can be reduced, and production efficiency can be improved, providing better protection for the production of light-burned magnesia. Utility Model Content

[0004] The purpose of the utility model is to provide an energy-saving structure of a hot blast furnace, comprising a furnace body, a feed port, an air inlet, a discharge port, and an injection device, wherein the feed port is arranged in the middle of the furnace body, the air inlet is arranged in the lower part of the furnace body, and the discharge port is arranged at the top of the furnace body; the furnace body comprises a hot blast chamber and a decomposition chamber, the hot blast chamber is arranged in the lower part of the furnace body, the decomposition chamber is arranged in the middle of the furnace body, a hot blast decomposition chamber is further provided between the hot blast chamber and the decomposition chamber, the injection device is arranged in the hot blast decomposition chamber and the hot blast chamber, the injection device comprises an injection pipe and a nozzle, the injection pipe passes through the furnace body, and the nozzle is arranged at the end of the injection pipe.

[0005] Furthermore, four horizontally surrounding injection pipes are provided in the hot air chamber, and five horizontally surrounding injection pipes are provided in the hot air decomposition chamber.

[0006] Furthermore, the nozzle includes an inner tube and an outer tube, the length of the inner tube is greater than that of the outer tube, and a spiral blade is fixedly connected to the end of the outer tube.

[0007] Furthermore, gas is passed through the inner tube and air is passed through the outer tube. The light-burned magnesium oxide drum cooler of the present invention has the following advantages:

[0008] 1. The heating decomposition chamber structure is adopted to reasonably control the temperature distribution in the furnace body, thereby improving the activity of decomposing light-burned magnesia in the decomposition chamber and reducing the emission of nitrogen oxides and the amount of raw coal used.

[0009] 2. The inner and outer nozzles and spiral blades are set to make the combustion at the nozzle more complete, reducing the power consumption of the compressor, slightly reducing the amount of raw coal used, and improving energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is the original hot blast furnace structure diagram.

[0011] Figure 2 It is the structure of the utility model.

[0012] Figure 3 This is the structural diagram of the original nozzle.

[0013] Figure 4 This is a nozzle structure diagram of the present utility model.

[0014] Figure 5 This is a structural diagram of the spiral blade of the present utility model.

[0015] Figure 6 It is the left view of the nozzle of the present utility model. DETAILED DESCRIPTION

[0016] The following combination Figure 1-5 The specific content of the utility model is described in detail through specific embodiments. The hot air furnace energy-saving structure is a device for calcining light-burned magnesia. It improves the activity of light-burned magnesia by setting up a hot air decomposition chamber, and reduces the amount of raw materials used by improving the layout of the injection device. The following is a specific embodiment:

[0017] 1. Equipment structure

[0018] A hot blast furnace energy-saving structure includes a furnace body 1, a feed port 2, an air inlet 3, a discharge port, and an injection device 4. The feed port 2 is arranged in the middle of the furnace body 1, the air inlet 3 is arranged in the lower part of the furnace body 1, and the discharge port is arranged at the top of the furnace body. The furnace body includes a hot blast chamber 5 and a decomposition chamber 6, the hot blast chamber 5 is arranged in the lower part of the furnace body, and the decomposition chamber 6 is arranged in the middle of the furnace body. It is characterized in that a hot blast decomposition chamber 7 is further provided between the hot blast chamber and the decomposition chamber, the injection device 4 is arranged in the hot blast decomposition chamber and the hot blast chamber, the injection device includes an injection pipe 8 and a nozzle 9, the injection pipe 8 passes through the furnace body 1, and the nozzle 9 is arranged at the end of the injection pipe 8. The three injection pipes are triangularly combined to become a single injection pipe, so that the local heating temperature before the nozzle is not higher than 1100°C, thereby reducing the generation of nitrogen oxides.

[0019] The hot air chamber is provided with four horizontally surrounding injection pipes, and the hot air decomposition chamber 7 is provided with five horizontally surrounding injection pipes. Such a layout can control the temperature of the hot air chamber at 900°C to achieve the purpose of preheating the air. The temperature in the hot air decomposition chamber is 1200°C, and the decomposition chamber gradually decreases from 1000°C to 750°C at the discharge port for full decomposition, further reducing the nitrogen oxide content. The fuel consumption per ton of finished magnesium oxide is reduced from 220kg standard coal to 180kg standard coal, and the temperature is uniform, and the activity of light-burned magnesium oxide is high.

[0020] The nozzle includes an inner tube 10 and an outer tube 11. The length of the inner tube is greater than that of the outer tube. A spiral blade 12 is fixedly connected to the end of the outer tube. Gas flows in the inner tube and air flows in the outer tube. The air passes through the spiral blades of the outer tube to generate a side cyclone. The negative pressure in the central area drives the gas injection from the inner tube, reducing the pressure of the gas pipeline. It is measured that the power consumption of the screw compressor is reduced by 30%.

[0021] 2. Working Principle

[0022] Air enters the hot air chamber from the air inlet at the bottom of the hot air furnace, and the injection device preheats the air to 900℃. The 900℃ air enters the hot air decomposition chamber upward and is further heated to 1200℃. The air comes into contact with the dolomite, and the surface of the dolomite is broken into finer powder. The broken powder further reacts in the decomposition chamber to achieve the optimal activity of light-burned magnesia products within the range of 1000-750 degrees Celsius.

[0023] 3. Advantages of the embodiment

[0024] The advantages of this embodiment mainly include the following aspects:

[0025] (1) The heating decomposition chamber structure is adopted to reasonably control the temperature distribution in the furnace body, thereby improving the activity of decomposing light-burned magnesium in the decomposition chamber and reducing the emission of nitrogen oxides and the amount of raw coal used.

[0026] (2) The setting of inner and outer nozzles and spiral blades makes the combustion at the nozzle more complete, reduces the power consumption of the compressor, slightly reduces the amount of raw coal used, and improves energy utilization.

[0027] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 a limitation on the present invention.

Claims

1. A hot blast furnace energy-saving structure, comprising a furnace body (1), a feed port (2), an air inlet (3), a discharge port, and an injection device (4), wherein the feed port (2) is arranged in the middle of the furnace body (1), the air inlet (3) is arranged in the lower part of the furnace body (1), and the discharge port is arranged at the top of the furnace body (1), the furnace body (1) comprises a hot blast chamber (5) and a decomposition chamber (6), the hot blast chamber (5) is arranged in the lower part of the furnace body (1), and the decomposition chamber (6) is arranged in the middle of the furnace body (1), characterized in that: A hot air decomposition chamber (7) is further provided between the hot air chamber (5) and the decomposition chamber (6). The injection device (4) is provided in the hot air decomposition chamber and the hot air chamber. The injection device comprises an injection pipe (8) and a nozzle (9). The injection pipe (8) passes through the furnace body (1), and the nozzle (9) is provided at the end of the injection pipe (8).

2. The hot blast stove energy-saving structure according to claim 1, characterized in that: The hot air chamber (5) is provided with four horizontally surrounding injection pipes (8), and the hot air decomposition chamber (7) is provided with five horizontally surrounding injection pipes (8).

3. The hot blast stove energy-saving structure according to claim 1, characterized in that: The nozzle (9) comprises an inner tube (10) and an outer tube (11), the length of the inner tube (10) is greater than the length of the outer tube (11), and a spiral blade (12) is fixedly connected to the end of the outer tube (11).

4. The hot blast stove energy-saving structure according to claim 3, characterized in that: The inner tube (10) is filled with gas, and the outer tube (11) is filled with air.

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