Preheating device for pulverized coal injection

Abstract

The utility model relates to the technical field of pulverized coal preheating, and discloses a preheating device for pulverized coal injection. The preheating device for pulverized coal injection comprises a pulverized coal pipe, one side of the top of the pulverized coal pipe is movably connected with a conveying pipe, a control valve is fixedly installed at the bottom of the middle of the conveying pipe, a heating device is fixedly installed on one side of the control valve, and a connecting pipe is fixedly installed on the top of the heating device; and a mounting valve is fixedly mounted on one side of the connecting pipe, a temperature detector is fixedly mounted at the top of the conveying pipe, and a merging pipe is fixedly mounted at the top of the conveying pipe. Smoke enters through the smoke inlet pipe and then is shunted through the shunting pipe, the shunted smoke is filtered through the two filters, particulate matter in the smoke is filtered out, the problem that the smoke enters the shell to be accumulated and blocked is avoided, the filter on one side can be detached and cleaned by closing the fixed valve and the switch valve on one side, and therefore the smoke purifying device is convenient to use. And the convenience of the preheating device for pulverized coal injection is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal powder preheating, in particular to a preheating device for coal powder injection. Background Art

[0002] Blast furnace injection technology involves injecting pulverized coal directly into the blast furnace to replace scarce and expensive metallurgical coke, acting as a heating agent and reducing agent, thereby reducing the coke ratio and pig iron cost. It is one of the most effective measures for steel companies to save coke, increase production and improve smelting processes. About 90% of pig iron is smelted in blast furnaces using fuel injection.

[0003] An existing Chinese utility model patent, CN218763502U, is available for reference. It discloses a pulverized coal preheating and injection device for a pulverized coal furnace. The device comprises a powder spraying canister, a feed pipe fixedly mounted on the top of the canister, a control valve fixedly mounted on the feed pipe, a powder delivery pipe fixedly mounted on the bottom of the canister, and a preheating assembly mounted outside the delivery pipe. The preheating assembly comprises a preheating cylinder, an insulation layer, and a heating coil. The preheating cylinder is mounted on the delivery pipe, the insulation layer is fixedly mounted on the inner wall of the preheating cylinder, and the heating coil is fixedly mounted inside the preheating cylinder and mounted on the delivery pipe. This utility model fully preheats the pulverized coal to the desired temperature, thereby improving its utilization rate.

[0004] Although the above-mentioned pulverized coal furnace preheating and injection device solves the disadvantage of not being able to further increase the pulverized coal temperature by preheating the pulverized coal inside the pulverized coal conveying pipeline through the heating coil, the above-mentioned equipment has high energy consumption during preheating and the preheating effect is poor. Utility Model Content

[0005] (1) Technical problems solved

[0006] In view of the deficiencies in the prior art, the present invention provides a preheating device for coal powder injection, which has the advantages of good preheating effect and low energy consumption, and solves the above technical problems.

[0007] (2) Technical solution

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a preheating device for pulverized coal injection, comprising:

[0009] A pulverized coal pipe, a delivery pipe is movably connected to one side of the top of the pulverized coal pipe, a control valve is fixedly installed on the middle bottom of the delivery pipe, a heating device is fixedly installed on one side of the control valve, a connecting pipe is fixedly installed on the top of the heating device, a mounting valve is fixedly installed on one side of the connecting pipe, a temperature detector is fixedly installed on the top of the delivery pipe, a merging pipe is fixedly installed on the top of the delivery pipe, two switching valves are fixedly installed on both sides of the top of the merging pipe, a filter is fixedly installed on the top of the switching valve, a fixed valve is fixedly installed on the top of the filter, a diversion pipe is fixedly installed on the top of the fixed valve, and a smoke inlet pipe is fixedly installed in the middle of the top of the diversion pipe.

[0010] As a preferred technical solution of the present invention, a temperature detector is fixedly installed on one side of the outer side of the pulverized coal pipe, and the temperature detector is a structure for detecting temperature.

[0011] As a preferred technical solution of the present invention, a silicone grease layer is fixedly installed on the middle outer side of the pulverized coal pipe, and the silicone grease layer is a structure for filling the gap.

[0012] As a preferred technical solution of the present invention, a heat-conducting fin is fixedly installed on the outer side of the silicone grease layer. The heat-conducting fin is annular in shape and is a structure for heat conduction.

[0013] As a preferred technical solution of the present invention, a shell is fixedly installed on the outer side of the pulverized coal pipe, and the shell is a structure for wrapping the outer side.

[0014] As a preferred technical solution of the present invention, a smoke outlet pipe is fixedly mounted on one side of the bottom of the shell, and the smoke outlet pipe is a structure for discharging smoke.

[0015] As a preferred technical solution of the present invention, a connection port is fixedly installed on one side of the top of the shell, and the connection port is a structure for connection.

[0016] Compared with the prior art, the present invention provides a preheating device for pulverized coal injection, which has the following beneficial effects:

[0017] 1. The utility model diverts smoke through the diversion pipe after the smoke enters, and then passes through the diversion pipe to filter the diverted smoke. The particulate matter in the smoke is filtered out, avoiding the problem of accumulation and blockage inside the shell. By closing the fixed valve and the switch valve on one side, the filter on one side can be disassembled and cleaned, thereby improving the convenience of the preheating device for coal powder injection, and the combined smoke is sent to the interior of the conveying pipe through the combining pipe.

[0018] 2. The utility model can detect the temperature of the flue gas inside the conveying pipe through a temperature detector. When the flue gas temperature is insufficient, the flue gas is sent from the connecting pipe into the interior of the heating device through the installed valve for heating. After heating, the flue gas returns to the interior of the conveying pipe through the control valve and finally enters the interior of the outer shell. The heat is absorbed by the heat-conducting fins to preheat the coal powder inside the coal powder pipe, thereby improving the use needs and convenience of the preheating device for coal powder injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the pulverized coal pipe of the utility model;

[0021] Figure 3 This is a schematic diagram of the delivery pipe of the utility model;

[0022] Figure 4 This is a schematic diagram of the merged pipe of the utility model.

[0023] Among them: 1. Pulverized coal pipe; 11. Temperature detector; 12. Silicone grease layer; 13. Heat-conducting fins; 14. Housing; 15. Smoke outlet pipe; 16. Connecting port; 2. Delivery pipe; 21. Control valve; 22. Heating device; 23. Connecting pipe; 24. Installation valve; 25. Temperature detector; 3. Merging pipe; 31. Switch valve; 32. Filter; 33. Fixed valve; 34. Diverter pipe; 35. Smoke inlet pipe. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] In the description of this utility model, unless otherwise specified, "plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed, or operate in a specific direction, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] See also Figure 1 - Figure 4 In this embodiment, a preheating device for pulverized coal injection includes: a pulverized coal pipe 1, a temperature detector 11 is fixedly installed on one side of the outer side of the pulverized coal pipe 1, a silicone grease layer 12 is fixedly installed on the middle outer side of the pulverized coal pipe 1, a heat-conducting fin 13 is fixedly installed on the outer side of the silicone grease layer 12, and the heat-conducting fin 13 is annular in shape. A shell 14 is fixedly installed on the outer side of the pulverized coal pipe 1, a smoke outlet pipe 15 is fixedly installed on the bottom side of the shell 14, and a connecting port 16 is fixedly installed on the top side of the shell 14.

[0028] Specifically, the silicone grease layer 12 can fill the gap between the heat-conducting fins 13 and the pulverized coal pipe 1 to conduct heat, the temperature detector 11 can detect the temperature after waste heat, the shell 14 can wrap the outside, and the smoke can be discharged through the smoke outlet pipe 15.

[0029] A delivery pipe 2 is movably connected to one side of the top of the pulverized coal pipe 1. A control valve 21 is fixedly installed at the middle bottom of the delivery pipe 2. A heating device 22 is fixedly installed on one side of the control valve 21. A connecting pipe 23 is fixedly installed on the top of the heating device 22. An installation valve 24 is fixedly installed on one side of the connecting pipe 23. A temperature detector 25 is fixedly installed on the top of the delivery pipe 2.

[0030] Specifically, the temperature of the flue gas inside the delivery pipe 2 can be monitored by the temperature detector 25. When the temperature is insufficient, the flue gas is sent into the interior of the heating device 22 through the connecting pipe 23 by installing the valve 24 for heating, and then sent back to the interior of the delivery pipe 2 through the control valve 21.

[0031] A merging pipe 3 is fixedly installed on the top of the delivery pipe 2, two switch valves 31 are fixedly installed on both sides of the top of the merging pipe 3, a filter 32 is fixedly installed on the top of the switch valve 31, a fixed valve 33 is fixedly installed on the top of the filter 32, a diversion pipe 34 is fixedly installed on the top of the fixed valve 33, and a smoke inlet pipe 35 is fixedly installed in the middle of the top of the diversion pipe 34.

[0032] Specifically, after the smoke enters through the smoke inlet pipe 35, it is diverted through the diversion pipe 34 and sent to the inside of the two filters 32 for filtration, so that impurities and dust in the high-temperature smoke can be filtered out, and the filtered smoke is merged through the merging pipe 3 and sent to the inside of the shell 14.

[0033] During use, the high-temperature flue gas is first sent into the interior of the diversion pipe 34 through the smoke inlet pipe 35 for diversion, and the diverted high-temperature flue gas is sent into the interior of the filter 32 through the two fixed valves 33. The dust and impurities in the high-temperature flue gas can be filtered out through the filter 32, thereby avoiding the problem of dust and impurities entering the interior of the shell 14 and accumulating and causing blockage inside the shell 14, thereby improving the practicality and convenience of the preheating device for coal powder injection. When it is necessary to filter the filter 32, by closing the fixed valve 33 and the switch valve 31 on one side, the high-temperature flue gas can be filtered through the filter 32 on the other side, so that the filter 32 on the closed side can be disassembled and cleaned, thereby avoiding the problem of the filter 32 being blocked due to long-term use and being inconvenient to clean during use, thereby improving the practicality of the preheating device for coal powder injection. The high-temperature flue gas is heated to a suitable temperature by the heating device 22 and then sent back to the inside of the delivery pipe 2 through the control valve 21. Finally, the high-temperature flue gas is sent into the inside of the outer shell 14 through the delivery pipe 2, thereby improving the practicability and convenience of the preheating device for pulverized coal injection and avoiding the problem of poor preheating effect caused by insufficient flue gas temperature. The gap between the heat-conducting fins 13 and the pulverized coal pipe 1 can be filled and sealed by the silicone grease layer 12, so that the pulverized coal inside the pulverized coal pipe 1 is preheated after the temperature is absorbed by the heat-conducting fins 13, and the flue gas is sent out through the smoke outlet pipe 15, thereby improving the practicability and convenience of the preheating device for pulverized coal injection.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A preheating device for pulverized coal injection, characterized in that: The pulverized coal injection preheating device comprises a pulverized coal pipe (1), a delivery pipe (2) movably connected to one side of the top of the pulverized coal pipe (1), a control valve (21) fixedly installed at the middle bottom of the delivery pipe (2), a heating device (22) fixedly installed on one side of the control valve (21), a connecting pipe (23) fixedly installed on the top of the heating device (22), a mounting valve (24) fixedly installed on one side of the connecting pipe (23), a temperature detector (25) fixedly installed on the top of the delivery pipe (2), a merging pipe (3) fixedly installed on the top of the delivery pipe (2), two switch valves (31) fixedly installed on both sides of the top of the merging pipe (3), a filter (32) fixedly installed on the top of the switch valve (31), a fixed valve (33) fixedly installed on the top of the filter (32), a diverter pipe (34) fixedly installed on the top of the fixed valve (33), and a smoke inlet pipe (35) fixedly installed in the middle of the top of the diverter pipe (34).

2. A preheating device for pulverized coal injection according to claim 1, characterized in that: A temperature detector (11) is fixedly mounted on one side of the outer side of the pulverized coal pipe (1).

3. A preheating device for pulverized coal injection according to claim 2, characterized in that: A silicone grease layer (12) is fixedly mounted on the middle outer side of the pulverized coal pipe (1).

4. A preheating device for pulverized coal injection according to claim 3, characterized in that: A heat-conducting fin (13) is fixedly mounted on the outer side of the silicone grease layer (12), and the heat-conducting fin (13) is annular in shape.

5. A preheating device for pulverized coal injection according to claim 4, characterized in that: An outer shell (14) is fixedly mounted on the outer side of the pulverized coal pipe (1).

6. A preheating device for pulverized coal injection according to claim 5, characterized in that: A smoke outlet pipe (15) is fixedly mounted on one side of the bottom of the housing (14).

7. A preheating device for pulverized coal injection according to claim 6, characterized in that: A connection port (16) is fixedly mounted on one side of the top of the housing (14).

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