Drying equipment for strip steel surface coating

Abstract

The drying equipment comprises an open fire furnace and a hot blast stove, the hot blast stove is placed on the outlet side of the open fire furnace and communicated with the open fire furnace, and a heat exchanger is fixedly installed on the inlet side of an inner cavity of the open fire furnace. A drying burner is arranged on the furnace wall of the open fire furnace, and a gas valve group and an air valve group are respectively communicated with the drying burner; a spraying box is installed in the hot blast stove, and a plurality of air spraying openings are formed in the spraying box. The drying device has the advantage of high efficiency, and solves the problems that the efficiency of drying the surface of the strip steel by hot air is not high, the heat loss is increased, and the environment-friendly and energy-saving effects of the drying device are reduced in the using process of the existing drying device for coating the surface of the strip steel.

Description

Technical Field

[0001] The utility model relates to the technical field of strip steel processing, in particular to drying equipment for strip steel surface coating. Background Art

[0002] Drying equipment for coated steel strips is used to quickly remove excess moisture or solvent from the strip surface after the coating process is complete, ensuring rapid curing and hardening of the coating. This equipment plays a vital role in ensuring coating quality, improving production efficiency, and conserving energy. During strip drying, direct flame heating combined with circulating hot air accelerates the evaporation of surface moisture. This type of equipment effectively controls temperature and humidity and is suitable for drying a variety of coating materials.

[0003] During use, the existing drying equipment for coating the surface of steel strips is not convenient for efficiently drying the steel strips by combining open flames and hot air, which increases heat loss and reduces the environmental protection and energy saving effect of the drying equipment. Utility Model Content

[0004] The purpose of the utility model is to provide a drying equipment for strip steel with coating on its surface, which has the advantage of high efficiency and solves the problem that the existing drying equipment for strip steel with coating on its surface is not convenient for efficiently drying the strip steel by combining open flame and hot air during use, which increases heat loss and reduces the environmental protection and energy-saving effect of the drying equipment.

[0005] To achieve the above object, the present invention provides the following technical solution: a drying device for coating the surface of a steel strip, comprising an open flame furnace and a hot air furnace, wherein the hot air furnace is placed at the outlet side of the open flame furnace and is connected to the open flame furnace.

[0006] A heat exchanger is fixedly installed on the inlet side of the inner cavity of the open flame furnace;

[0007] A drying burner is installed on the wall of the open flame furnace, and the drying burner is connected to a gas valve group and an air valve group respectively;

[0008] A spray box is installed inside the hot blast furnace, and a plurality of air injection ports are opened on the spray box.

[0009] As a preferred drying equipment for strip steel surface coating of the present invention, the exterior of the open flame furnace and the hot air furnace is a steel structure, and refractory heat-insulating materials are installed inside the steel structure.

[0010] As a preferred drying equipment for strip steel surface coating of the present invention, the air inlet end of the gas valve group is connected to a gas pipeline, the air inlet end of the air valve group is connected to an air supply pipe, and the air inlet end of the air supply pipe is connected to an air pipeline.

[0011] As a preferred drying equipment for strip steel surface coating of the present invention, the air inlet end of the gas pipeline is connected to a gas regulating valve, the air inlet end of the gas regulating valve is connected to a gas flow meter, and the gas flow meter is connected to the gas main.

[0012] As a preferred drying equipment for strip steel surface coating of the present invention, the air inlet end of the air pipeline is connected to a combustion-supporting pipe, the air inlet end of the combustion-supporting pipe is connected to an air regulating valve, the air inlet end of the air regulating valve is connected to an air flow meter, and the air inlet end of the air flow meter is connected to a combustion-supporting fan.

[0013] As a preferred drying equipment for strip steel surface coating of the utility model, it also includes a hot air circulation fan, the air inlet end of the hot air circulation fan is respectively connected to the first flap valve and the second flap valve, the air inlet end of the first flap valve is connected to the first hot air pipe, the air inlet end of the first hot air pipe is connected to the air suction port, and the air suction port is fixedly installed on the inlet side of the open flame furnace.

[0014] As a preferred drying equipment for strip steel surface coating of the present invention, the air inlet end of the second flap valve is connected to a second hot air pipe, and the air inlet end of the second hot air pipe passes through the right side of the hot air furnace cavity.

[0015] As a preferred drying device for strip steel surface coating of the present invention, the air outlet end of the hot air circulation fan is connected to an air outlet pipe, and the air outlet end of the air outlet pipe is connected to the air inlet end of the spray box.

[0016] As a preferred drying equipment for strip steel surface coating of the present invention, the heat exchanger includes a circulating square tube, one side of the circulating square tube is connected to a plurality of air outlet circular tubes and air inlet circular tubes, the air outlet end of the air outlet circular tube is connected to the air outlet square tube, and the air inlet end of the air inlet circular tube is connected to the air inlet square tube.

[0017] As a preferred drying equipment for strip steel surface coating of the present invention, the square air outlet pipe is fixedly connected to the square air inlet pipe, the square air inlet pipe is connected to a flue gas inlet, the flue gas inlet is connected to the combustion flue gas, and the air outlet pipe is connected to a cold air outlet.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. The utility model adopts the method of hot air heat exchange and direct burning of open flame, which makes the heating method more direct, reduces heat loss, and is more environmentally friendly and energy-saving. Moreover, the open flame is generated by the drying burner, which is easier to adjust and control. Through open flame and hot air drying, the temperature inside the drying equipment is higher, which can meet the needs of high-speed and large-volume production lines.

[0020] 2. When the strip is dried by the present invention, the outlet of the open flame furnace is connected with the inlet of the hot blast furnace. After the surface of the strip is coated, it enters from the inlet of the open flame furnace. The drying burner in the open flame furnace burns to emit an open flame. After the open flame reaches the required temperature for drying, the coating on the surface of the strip is dried. During the operation of the drying burner, external gas enters the gas pipeline through the gas flow meter and the gas regulating valve. The gas flow meter and the gas regulating valve detect and control the gas flow. The gas after flow adjustment enters the drying burner through the gas valve group. The combustion-supporting fan draws air from the outside and delivers it to the air flow meter, the air regulating valve and the air pipeline. The air flow meter and the air regulating valve adjust the air flow. The air inside the air pipeline enters the drying burner through the air valve group. The air valve group switches the air volume to control the combustion or shutdown of the drying burner. The air and gas are mixed and burned inside the drying burner to generate an open flame to dry the strip.

[0021] 3. The spray box inside the hot blast furnace of the utility model sprays hot air through the air jet port to perform secondary drying on the strip steel, which can make the surface temperature of the strip steel more uniform, the drying more thorough, and perform the initial cooling. During the operation of the spray box, the hot air circulation fan extracts hot air from the open flame furnace and the hot blast furnace through the first flap valve, the second flap valve, the first hot air pipe, the air nozzle and the second hot air pipe. The first hot air pipe and the air suction port extract the hot air from the inlet of the open flame furnace, and the second hot air pipe extracts the hot air from the inside of the hot blast furnace. The second flap valve and the first flap valve adjust the extraction amount, and the extracted hot air enters the spray box through the air outlet pipe to supply air to the spray box. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front sectional view of the utility model;

[0023] Figure 2 This is a top view of the utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the practical heat exchanger.

[0025] In the figure: 1. Open flame stove; 2. Hot air stove; 3. Gas pipeline; 4. Heat exchanger; 5. First hot air pipe; 6. Air nozzle; 7. Air pipeline; 8. Gas supply pipe; 9. Drying burner; 10. Air valve group; 11. Gas valve group; 12. Spray box; 13. Air outlet pipe; 14. Combustion-supporting fan; 15. Hot air circulation fan; 16. Air regulating valve; 17. Gas regulating valve; 18. Gas flow meter; 19. Combustion-supporting pipe; 20. First flap valve; 21. Second flap valve; 22. Second hot air pipe; 23. Air flow meter; 401. Circulation square pipe; 402. Outlet circular pipe; 403. Outlet square pipe; 404. Cold air outlet; 405. Flue gas inlet; 406. Inlet square pipe; 407. Inlet circular pipe. DETAILED DESCRIPTION

[0026] See also Figure 1-Figure 3 A drying device for coating the surface of a steel strip comprises an open flame furnace 1 and a hot air furnace 2. The hot air furnace 2 is placed at the outlet side of the open flame furnace 1 and is connected thereto.

[0027] Furthermore, a heat exchanger 4 is fixedly installed on the inlet side of the inner cavity of the open flame furnace 1.

[0028] Furthermore, a drying burner 9 is installed on the furnace wall of the open flame furnace 1, and the drying burner 9 is connected to a gas valve group 11 and an air valve group 10 respectively.

[0029] Furthermore, a spray box 12 is installed inside the hot blast furnace 2, and a plurality of air jets are opened on the spray box 12.

[0030] Furthermore, the exterior of the open flame furnace 1 and the hot blast furnace 2 is a steel structure, and fire-resistant heat-insulating materials are installed inside the steel structure.

[0031] Furthermore, the air inlet end of the gas valve group 11 is connected to the gas pipeline 3 , the air inlet end of the air valve group 10 is connected to the air supply pipe 8 , and the air inlet end of the air supply pipe 8 is connected to the air pipeline 7 .

[0032] Furthermore, the gas inlet end of the gas pipeline 3 is connected to a gas regulating valve 17 , the gas inlet end of the gas regulating valve 17 is connected to a gas flow meter 18 , and the gas flow meter 18 is connected to the gas main.

[0033] Furthermore, the air inlet end of the air pipeline 7 is connected to the combustion-supporting pipe 19, the air inlet end of the combustion-supporting pipe 19 is connected to the air regulating valve 16, the air inlet end of the air regulating valve 16 is connected to the air flow meter 23, and the air inlet end of the air flow meter 23 is connected to the combustion-supporting blower 14.

[0034] Furthermore, it also includes a hot air circulation fan 15, the air inlet end of the hot air circulation fan 15 is respectively connected to the first flap valve 20 and the second flap valve 21, the air inlet end of the first flap valve 20 is connected to the first hot air pipe 5, and the air inlet end of the first hot air pipe 5 is connected to the air intake port 6, which is fixedly installed on the right side of the open flame stove 1.

[0035] Furthermore, the air inlet end of the second flap valve 21 is connected to the second hot air pipe 22 , and the air inlet end of the second hot air pipe 22 passes through the right side of the inner cavity of the hot air stove 2 .

[0036] Furthermore, the air outlet end of the hot air circulation fan 15 is connected to the air outlet pipe 13 , and the air outlet end of the air outlet pipe 13 is connected to the air inlet end of the spray box 12 .

[0037] Furthermore, the heat exchanger 4 includes a circulation square tube 401, one side of which is connected to several air outlet circular tubes 402 and air inlet circular tubes 407, the air outlet end of the air outlet circular tube 402 is connected to the air outlet square tube 403, and the air inlet end of the air inlet circular tube 407 is connected to the air inlet square tube 406.

[0038] Furthermore, the square air outlet pipe 403 is fixedly connected to the square air inlet pipe 406 . The square air inlet pipe 406 is connected to a flue gas inlet 405 . The flue gas inlet 405 is connected to the combustion air. The square air outlet pipe 403 is connected to a cold air outlet 404 .

[0039] Furthermore, thermocouples are installed on the open flame furnace 1 and the hot air furnace 2. The thermocouples detect the temperature inside the open flame furnace 1 and the hot air furnace 2, and the detection signal is transmitted to the external control system. The control system controls the gas outlet of the gas valve group 11 and the air valve group 10 according to the preset temperature and the detection temperature to adjust the open flame temperature of the drying burner 9, and adjusts the exhaust volume of the second flap valve 21 and the first flap valve 20 to control the flow rate of the hot air.

[0040] Furthermore, the gas valve group 11 includes a pressure regulating valve, a filter and a manual shut-off valve. The pressure regulating valve is used to adjust the outlet pressure of the gas pipeline 3, the filter is used to filter impurities in the gas pipeline 3, and the manual shut-off valve is used to cut off the gas flow.

[0041] Furthermore, the gas regulating valve 17 and the gas flow meter 18 are used to detect the gas flow and regulate the gas flow.

[0042] Furthermore, the air valve group 10 includes an air shut-off valve and an air balancing valve. The air shut-off valve is used to cut off the air supply and control the combustion of the drying burner 9 , and the air balancing valve is used to adjust the combustion state of the drying burner 9 .

[0043] Furthermore, the drying burner 9 includes a gas shut-off valve, a gas balancing valve and a burner body. The gas shut-off valve is used to cut off the gas supply, and the gas balancing valve is used to adjust the combustion state of the drying burner 9. The burner body fully burns the supplied air and gas to generate the heat required for drying the strip steel.

[0044] When drying the strip steel, the outlet of the open flame furnace 1 is connected to the inlet of the hot blast furnace 2. After the surface of the strip steel is coated, it enters from the inlet of the open flame furnace 1. The drying burner 9 in the open flame furnace 1 burns to emit an open flame. After the open flame reaches the required drying temperature, the coating on the surface of the strip steel is dried. During the operation of the drying burner 9, the external gas enters the gas pipeline 3 through the gas regulating valve 17 and the gas flow meter 18. The gas regulating valve 17 and the gas flow meter 18 detect and control the gas flow. The gas after the flow adjustment enters the drying burner 9 through the gas valve group 11. The combustion-supporting fan 14 draws air from the outside and delivers it to the air regulating valve 16 and the air pipeline 7 through the air flow meter 23. The air flow meter 23 and the air regulating valve 16 adjust the air flow. The air inside the air pipeline 7 enters the drying burner 9 through the air valve group 10. The air valve group 10 switches the air to adjust the combustion or shutdown of the burner. The air and gas are mixed and burned inside the drying burner 9 to generate an open flame to dry the strip steel.

[0045] After the initial drying, the strip enters the entrance of the hot blast furnace 2 from the outlet of the open flame furnace 1, and then moves inside the hot blast furnace 2. The spray box 12 inside the hot blast furnace 2 sprays hot air through the air jet port to perform secondary drying on the strip, which can make the surface temperature of the strip more uniform, the drying more thorough, and perform the initial cooling.

[0046] During the operation of the spray box 12, the hot air circulation fan 15 extracts hot air from the open flame stove 1 and the hot air stove 2 through the first flap valve 20, the second flap valve 21, the first hot air pipe 5, the air intake 6 and the second hot air pipe 22. The first hot air pipe 5 and the air nozzle 6 extract the hot air from the right end of the inner cavity of the open flame stove 1, and the second hot air pipe 22 extracts the hot air from the right end of the inner cavity of the hot air stove 2. The second flap valve 21 and the first flap valve 20 adjust the extraction amount, and the extracted hot air enters the spray box 12 through the air outlet pipe 13 to supply air to the spray box 12.

[0047] By adopting the method of hot air heat exchange and direct burning of open flame, the heating method is more direct, heat loss is reduced, and it is more environmentally friendly and energy-saving. Moreover, the open flame is generated by the drying burner 9, which is easier to adjust and control. Through open flame and hot air drying, the temperature in the drying equipment is made higher, which can meet the needs of high-speed and large-volume production lines.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A drying device for coating a steel strip surface, comprising an open flame furnace (1) and a hot air furnace (2), wherein the hot air furnace (2) is installed at the outlet side of the open flame furnace (1) and communicated with the hot air furnace (2), characterized in that: A heat exchanger (4) is fixedly installed on the inlet side of the furnace body of the open flame furnace (1); A drying burner (9) is installed on the furnace wall of the open flame furnace (1), and the drying burner (9) is connected to a gas valve group (11) and an air valve group (10) respectively; A spray box (12) is installed inside the hot blast furnace (2), and a plurality of air jet ports are provided on the spray box (12).

2. The drying equipment for coating a steel strip surface according to claim 1, characterized in that: The exteriors of the open flame furnace (1) and the hot blast furnace (2) are steel structures, and fire-resistant heat-insulating materials are installed inside the steel structures.

3. The drying equipment for coating a steel strip surface according to claim 1, characterized in that: The air inlet end of the gas valve group (11) is connected to a gas pipeline (3), the air inlet end of the air valve group (10) is connected to an air supply pipe (8), and the air inlet end of the air supply pipe (8) is connected to an air pipeline (7).

4. The drying equipment for coating a steel strip surface according to claim 3, characterized in that: The gas inlet end of the gas pipeline (3) is connected to a gas regulating valve (17), the gas inlet end of the gas regulating valve (17) is connected to a gas flow meter (18), and the gas flow meter (18) is connected to a gas main.

5. The drying equipment for coating the surface of a steel strip according to claim 4, characterized in that: The air inlet end of the air pipeline (7) is connected to a combustion-supporting pipe (19), the air inlet end of the combustion-supporting pipe (19) is connected to an air regulating valve (16), the air inlet end of the air regulating valve (16) is connected to an air flow meter (23), and the air inlet end of the air flow meter (23) is connected to a combustion-supporting blower (14).

6. The drying equipment for coating a steel strip surface according to claim 1, characterized in that: The invention also includes a hot air circulation fan (15), wherein the air inlet end of the hot air circulation fan (15) is respectively connected to a first flap valve (20) and a second flap valve (21), the air inlet end of the first flap valve (20) is connected to a first hot air pipe (5), and the air inlet end of the first hot air pipe (5) is connected to an air suction port (6), and the air suction port (6) is fixedly installed on the right side of the open flame stove (1).

7. The drying equipment for coating the surface of a steel strip according to claim 6, characterized in that: The air inlet end of the second flap valve (21) is connected to a second hot air pipe (22), and the air inlet end of the second hot air pipe (22) passes through the right side of the inner cavity of the hot air furnace (2).

8. The drying equipment for coating the surface of a steel strip according to claim 7, characterized in that: The air outlet end of the hot air circulation fan (15) is connected to an air outlet pipeline (13), and the air outlet end of the air outlet pipeline (13) is connected to the air inlet end of the spray box (12).

9. The drying equipment for coating a steel strip surface according to claim 1, characterized in that: The heat exchanger (4) comprises a circulation square tube (401), one side of the circulation square tube (401) is connected to a plurality of air outlet circular tubes (402) and an air inlet circular tube (407), the air outlet end of the air outlet circular tube (402) is connected to the air outlet square tube (403), and the air inlet end of the air inlet circular tube (407) is connected to the air inlet square tube (406).

10. The drying equipment for coating the surface of a steel strip according to claim 9, characterized in that: The air outlet square tube (403) is fixedly connected to the air inlet square tube (406); the air inlet square tube (406) is connected to a smoke inlet (405); the smoke inlet (405) is connected to combustion smoke; and the air outlet square tube (403) is connected to a cold air outlet (404).

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