A hot blast stove coal powder injection device

Abstract

The utility model discloses a kind of hot blast furnace coal powder's injection device, including injection tank and hot blast furnace, the side of injection tank is provided with air inlet pipeline, heat exchanger and heater are provided on air inlet pipeline, the top of injection tank is provided with feed pipeline, heat exchanger and heater are also provided on feed pipeline, connecting pipeline is provided between injection tank and hot blast furnace, the top of hot blast furnace is provided with air outlet pipeline, air outlet pipeline pipeline is connected with regenerative pipeline, regenerative pipeline divides two regenerative branch pipes, two regenerative branch pipes are connected with the import of two heat exchangers respectively, the outlet of two heat exchangers is provided with exhaust branch pipe, two exhaust branch pipes are gathered into one exhaust pipeline;The utility model collects the exhaust of hot blast furnace and utilizes heat, cooperate heater, improve the heating effect to material, reduce the loss of heat, improve heat conversion efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of hot blast stove equipment, and in particular to a coal powder injection device for a hot blast stove. Background Technology

[0002] Hot blast furnaces, as a type of thermal power machinery, have been widely used in industries such as power, chemical, metallurgy, cement, pharmaceutical, and textile, becoming a replacement for traditional electric and steam heat sources. They are an indispensable main piece of equipment in drying devices such as airflow drying, spray drying, fluidized bed drying, and rotary drying. Existing hot blast furnaces require preheating of pulverized coal and gas before combustion to ensure better combustion and improve heat conversion efficiency. However, simply using a heater to heat the material is insufficient in heating effect, failing to fully utilize heat and resulting in significant energy waste. Utility Model Content

[0003] The purpose of this invention is to provide a coal powder injection device for a hot blast stove, which collects the exhaust gas from the hot blast stove and utilizes the heat. In conjunction with a heater, it improves the heating effect on the material, reduces heat loss, and increases heat conversion efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a pulverized coal injection device for a hot blast stove, comprising an injection tank and a hot blast stove, an air inlet pipe on one side of the injection tank, a heat exchanger and a heater on the air inlet pipe, a feed pipe on the top of the injection tank, a heat exchanger and a heater on the feed pipe, a connecting pipe between the injection tank and the hot blast stove, an air outlet pipe on the top of the hot blast stove, a regenerative pipe connected to the air outlet pipe, two regenerative branch pipes branching off from the regenerative pipe, the two regenerative branch pipes being connected to the inlets of two heat exchangers respectively, and exhaust branch pipes being provided at the outlets of the two heat exchangers, the two exhaust branch pipes converging into one exhaust pipe.

[0005] Optionally, the injection tank has a conical structure, and several inclined baffles are fixedly connected to the inner wall of the injection tank. The baffles are evenly staggered in the horizontal and vertical directions.

[0006] Optionally, the bottom baffle is positioned facing the air inlet duct.

[0007] Optionally, the heat exchanger is provided with distribution plates at both ends, and a number of distribution pipes are evenly arranged between the two distribution plates. The gas flow direction in the heat exchanger is opposite to the material flow direction in the distribution pipes.

[0008] Optionally, a filter is installed on the regenerative piping.

[0009] Optionally, the air inlet duct, feed duct, and connecting duct are all provided with an insulation layer on the outside.

[0010] The pulverized coal injection device for the hot blast stove of this invention has the following advantages: (1) The reheat pipe collects part of the exhaust gas from the hot air furnace and sends it into two heat exchangers to preheat the air and pulverized coal, and recover part of the heat of the exhaust gas. The heater then reheats the air and pulverized coal to further increase the temperature. The high-temperature pulverized coal and high-temperature air are mixed in the injection tank and then enter the hot air furnace for combustion.

[0011] (2) The baffle plate can fully disperse the coal powder, so that the coal powder can be more fully mixed with the incoming air and can burn faster and more fully after entering the hot blast stove.

[0012] (3) Distribution pipes can increase the heat exchange area between materials and hot air, thereby improving the heating effect. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is a simplified internal diagram of a heat exchanger. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings. Figure 1 The direction in the middle is the reference.

[0016] like Figures 1-2 As shown, a pulverized coal injection device for a hot blast stove includes an injection tank 1 and a hot blast stove 2. An air inlet pipe 3 is located on the left side of the injection tank 1, and a heat exchanger 4 and a heater 5 are installed on the air inlet pipe 3. The heat exchanger 4 is located upstream of the heater 5. A feed pipe 6 is located at the top of the injection tank 1, and a heat exchanger 4 and a heater 5 are also installed on the feed pipe 6, with the heat exchanger 4 located upstream of the heater 5. The injection tank 1 has a conical structure. Two inclined baffle plates 7 are fixedly connected to the inner wall of the injection tank 1. One baffle plate 7 is located at the upper left, and the other baffle plate 7 is located at the lower right. The lowermost baffle plate 7 faces the air inlet pipe 3. When the pulverized coal falls from the feed pipe 6, it is dispersed by the two baffle plates 7 and falls into the air inlet pipe 3, which facilitates the thorough mixing of the air and the pulverized coal.

[0017] A connecting pipe 8 is installed between the injection tank 1 and the hot blast stove 2. After the incoming air is mixed with pulverized coal, it enters the hot blast stove 2 through the connecting pipe 8. An air outlet pipe 9 is installed at the top of the hot blast stove 2. A regenerative pipe 10 is connected to the air outlet pipe 9. A filter 17 is installed on the regenerative pipe 10 to filter the exhaust gas, preventing more impurities from entering the heat exchanger 4 and improving the service life of the heat exchanger 4. Two regenerative branch pipes 11 branch off from the regenerative pipe 10. The two regenerative branch pipes 11 are connected to the inlets of the two heat exchangers 4 respectively. An exhaust branch pipe 12 is installed at the outlet of the two heat exchangers 4. The two exhaust branch pipes 12 converge into an exhaust pipe 13.

[0018] Distribution plates 14 are provided at both ends of the heat exchanger 4, and several distribution pipes 15 are evenly arranged between the two distribution plates 14. The gas flow direction inside the heat exchanger 4 is opposite to the material flow direction inside the distribution pipes 15. The distribution pipes 15 can increase the heat exchange area between the material and the exhaust gas, thereby improving the preheating effect of the material. The air inlet pipe 3, the feed pipe 6, and the connecting pipe 8 are all provided with insulation layers 16 to reduce heat loss during air intake and coal powder retransmission, and improve heat utilization efficiency.

[0019] After the heat from the combustion of pulverized coal in the hot blast stove 2 is utilized, the exhaust gas still has a high temperature. A portion of the exhaust gas from the hot blast stove 2 is collected via the reheat pipe 10 and sent to two heat exchangers 4 through the reheat branch pipe 11. Convection heat exchange provides initial heating of the inlet air and pulverized coal, partially recovering the heat from the exhaust gas. Then, the heater 5 further heats the inlet air and pulverized coal, increasing their temperature. The high-temperature pulverized coal and high-temperature inlet air are uniformly mixed in the injection tank 1 and finally enter the hot blast stove 2 for rapid and complete combustion, releasing heat. By collecting the exhaust gas from the hot blast stove 2 and recovering the heat, the heating load on the heater 5 is reduced. The secondary heating by the heater 5 improves the heating effect on the materials, reduces heat loss, and increases heat conversion efficiency.

[0020] The embodiments described above are merely some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the protection scope of this utility model.

Claims

1. A coal pulverization injection device for a hot blast stove, characterized in that: It includes a blower tank and a hot air furnace. The blower tank has an air inlet pipe on one side, and a heat exchanger and a heater are installed on the air inlet pipe. The blower tank has a feed pipe on the top, and a heat exchanger and a heater are also installed on the feed pipe. A connecting pipe is installed between the blower tank and the hot air furnace. The hot air furnace has an air outlet pipe on the top, and a regenerative pipe is connected to the air outlet pipe. The regenerative pipe branches into two regenerative branch pipes, which are respectively connected to the inlets of two heat exchangers. The outlets of the two heat exchangers are equipped with exhaust branch pipes, and the two exhaust branch pipes are combined into one exhaust pipe.

2. The pulverized coal injection device for a hot blast stove as described in claim 1, characterized in that: The injection tank has a conical structure, and several inclined baffles are fixedly connected to the inner wall of the injection tank. The baffles are evenly staggered in the horizontal and vertical directions.

3. The pulverized coal injection device for a hot blast stove as described in claim 2, characterized in that: The bottom baffle is positioned facing the air inlet duct.

4. The pulverized coal injection device for a hot blast stove as described in claim 1, characterized in that: The heat exchanger has distribution plates at both ends, and several distribution pipes are evenly distributed between the two distribution plates. The gas flow direction inside the heat exchanger is opposite to the material flow direction inside the distribution pipes.

5. The pulverized coal injection device for a hot blast stove as described in claim 1, characterized in that: A filter is installed on the heat recovery pipe.

6. The pulverized coal injection device for a hot blast stove as described in claim 1, characterized in that: The air inlet pipe, feed pipe, and connecting pipe are all equipped with an insulation layer on the outside.

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