Rotary kiln combustion system

Abstract

According to the rotary kiln combustion system, when rotary kiln combustion is needed, the end, close to a rotary kiln, of a gas supply pipeline in a communicating assembly is kept closed, a nitrogen purging valve arranged on the gas supply pipeline can purge the gas supply pipeline through nitrogen, and it is kept that the gas supply pipeline is filled with safe nitrogen; the possibility that combustible gas explodes in the gas supply pipeline is reduced, and the use safety of the rotary kiln is improved. Gas in the combustible gas supply equipment is led into the kiln head through the gas supply pipeline. And the ignition equipment is arranged at the kiln head of the rotary kiln and is used for igniting the combustible gas in the rotary kiln. An outlet of the air blower is communicated with the kiln head, an inlet of the induced draft fan is communicated with the kiln tail of the rotary kiln, flowing of air in the rotary kiln is controlled, and combustible gas can be combusted more sufficiently. And in cooperation with nitrogen purging before combustion of the rotary kiln, combustible gas can be combusted more sufficiently, and potential safety hazards during use are reduced. And the problem of potential safety hazards caused by difficult sufficient combustion and insufficient combustion of gas combustion is solved to a certain extent.

Description

Technical Field

[0001] The present application belongs to the technical field of rotary kiln ignition technology, and in particular to a rotary kiln combustion system. Background Art

[0002] At present, rotary kilns and rotary hearth furnaces are relatively mature and widely used technologies in the treatment of zinc-containing dust in steel enterprises in the world. Compared with rotary hearth furnaces, rotary kiln process equipment is simple, technology is mature, and investment is low. Although the energy consumption is high and the kiln is prone to ring formation, the rotary kiln has flexible production scale and has certain advantages in the treatment of zinc-containing metallurgical dust. The rotary kiln needs to ignite the internal fuel before calcination.

[0003] In the prior art, a gas ignition device is added to the kiln head of the rotary kiln to introduce gas into the rotary kiln and ignite it for combustion, thereby improving the processing efficiency of the rotary kiln. However, due to the limited air inside the rotary kiln, it is difficult for the gas to fully burn in the rotary kiln after ignition, and incomplete combustion of the gas will also bring certain safety hazards. Summary of the invention

[0004] The present application aims to at least to some extent solve the problem of difficulty in fully burning gas and potential safety hazards caused by incomplete combustion. To this end, the present application provides a rotary kiln combustion system.

[0005] The embodiment of the present application provides a rotary kiln combustion system, which is used to burn fuel in a rotary kiln and includes:

[0006] Combustible gas supply equipment and nitrogen gas source;

[0007] A connecting component, provided with a nitrogen purge valve and a gas supply pipeline with controllable on / off at both ends, the two ends of the gas supply pipeline are respectively used to connect the combustible gas supply equipment with the kiln head of the rotary kiln, and the nitrogen purge valve is arranged on the gas supply pipeline and is used to connect the nitrogen gas source;

[0008] A blower, the outlet of which is connected to the kiln head;

[0009] An induced draft fan, the inlet of which is connected to the kiln tail of the rotary kiln;

[0010] The ignition device is arranged at the kiln head of the rotary kiln and is used for igniting the combustible gas in the rotary kiln.

[0011] Optionally, the rotary kiln combustion system further comprises:

[0012] Pressure detection gauges are respectively arranged at the outlet of the blower and the inlet of the induced draft fan.

[0013] Optionally, the connectivity component further includes:

[0014] A temperature sensor is arranged in the rotary kiln;

[0015] The solenoid valve is arranged in the air supply pipeline and is electrically connected to the temperature sensor so as to close the air supply pipeline when the temperature sensor detects flameout.

[0016] Optionally, the connectivity component further includes:

[0017] A safety pipe, both ends of which are connected to the gas supply pipe and are spaced apart from each other;

[0018] A safety valve is arranged on the safety pipeline.

[0019] Optionally, the connectivity component further includes:

[0020] The automatic relief valve and the manual relief valve are arranged at intervals in the safety pipeline and are both spaced apart from the safety valve.

[0021] Optionally, two ends of the gas supply pipeline are connected to the combustible gas supply device and the kiln head respectively, and the connecting component further includes:

[0022] At least two control valves are respectively arranged at both ends of the gas supply pipeline and located on both sides of the safety pipeline;

[0023] At least two pressure gauges are respectively arranged at two ends of the gas supply pipeline and located on both sides of the safety pipeline.

[0024] Optionally, the connectivity component further includes:

[0025] a pressure regulating valve, disposed in the gas supply pipeline and spaced apart from the nitrogen purge valve;

[0026] A regulating valve is arranged on the gas supply pipeline and is located between the pressure regulating valve and the rotary kiln.

[0027] Optionally, the rotary kiln combustion system comprises:

[0028] The burner is provided with an air inlet and a connecting port which are spaced and connected. The air inlet is connected to the ignition device, the air inlet is also connected to the air supply pipeline and the blower, and the connecting port is connected to the kiln head.

[0029] Optionally, the rotary kiln combustion system further comprises:

[0030] The outlet of one of the two blowers is connected to the connecting port of the burner, and the outlet of the other blower is connected to the kiln head through a pipeline.

[0031] Optionally, the ignition device comprises:

[0032] An ignition gun, provided with an ignition port, the ignition port being communicated with the kiln head;

[0033] A controller is connected to the ignition gun and is used to control the switch of the ignition gun.

[0034] The embodiments of the present application have at least the following beneficial effects:

[0035] The rotary kiln combustion system can be used to burn fuel in a rotary kiln. When the rotary kiln needs to burn, the end of the gas supply pipeline in the connecting component close to the rotary kiln is kept closed, and the other end of the gas supply pipeline is opened. The nitrogen purge valve arranged on the gas supply pipeline can purge the gas supply pipeline with nitrogen, exhaust the gas through the open end of the gas supply pipeline, and fill the gas supply pipeline with relatively safe nitrogen, thereby reducing the possibility of explosion of combustible gas in the gas supply pipeline during the process of gas entering the rotary kiln from the gas supply pipeline, and improving the safety of the use of the rotary kiln. The gas supply pipeline connects the combustible gas supply equipment with the kiln head, and the gas in the combustible gas supply equipment is conducted to the kiln head to meet the combustion demand in the rotary kiln. The ignition equipment arranged at the kiln head of the rotary kiln ignites the combustible gas in the rotary kiln, and the rotary kiln burns normally. The blower whose outlet is connected to the kiln head and the induced draft fan whose inlet is connected to the kiln tail of the rotary kiln can control the flow of air in the rotary kiln before and during the combustion of the rotary kiln, so that the combustible gas in the rotary kiln can be burned more fully. It also reduces the potential safety hazard of gas explosion caused by incomplete combustion of combustible gas. In conjunction with the nitrogen purge before combustion in the rotary kiln, the combustible gas can be burned more fully and the safety hazard during use can be reduced. To a certain extent, it solves the problem of difficulty in fully burning gas and the safety hazard caused by incomplete combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic structural diagram of a rotary kiln combustion system provided in this application.

[0037] Explanation of the reference numerals: 1. Connecting component; 11. Nitrogen purge valve; 12. Gas supply pipeline; 13. Solenoid valve; 14. Safety pipeline; 15. Safety valve; 16. Automatic relief valve; 17. Manual relief valve; 18. Control valve; 19. Pressure gauge; 20. Pressure regulating valve; 21. Regulating valve; 2. Blower; 3. Induced draft fan; 4. Ignition equipment; 41. Ignition gun; 42. Control switch; 5. Pressure test gauge; 6. Burner; 61. Air inlet; 62. Connecting port; 7. Combustible gas supply equipment; 8. Nitrogen gas source; 10. Rotary kiln; 101. Kiln head; 102. Kiln tail. DETAILED DESCRIPTION

[0038] In order to enable technicians in the technical field to which the present application belongs to understand the present application more clearly, the technical solution of the present application is described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0039] Figure 1A schematic diagram of the structure of a rotary kiln combustion system provided in this application, refer to Figure 1 It can be seen that the rotary kiln combustion system provided in the embodiment of the present application is used to burn fuel in the rotary kiln, including:

[0040] Combustible gas supply equipment 7 and nitrogen gas source 8.

[0041] The connecting component 1 is provided with a nitrogen purge valve 11 and a gas supply pipeline 12 with controllable on / off at both ends. The two ends of the gas supply pipeline 12 are respectively used to connect the combustible gas supply equipment 7 and the kiln head 101 of the rotary kiln 10. The nitrogen purge valve 11 is arranged on the gas supply pipeline 12 to purge the gas supply pipeline 12 and the rotary kiln 10 with nitrogen.

[0042] The outlet of the blower 2 is communicated with the kiln head 101 .

[0043] The inlet of the induced draft fan 3 is communicated with the kiln tail 102 of the rotary kiln 10 .

[0044] The ignition device 4 is disposed at the kiln head 101 of the rotary kiln 10 and is used to ignite the combustible gas in the rotary kiln 10 .

[0045] The combustion system of the rotary kiln 10 can be used to burn the fuel in the rotary kiln 10. When the rotary kiln 10 needs to be burned, the end of the gas supply pipe 12 in the connecting component 1 close to the rotary kiln 10 remains closed, and the other end of the gas supply pipe 12 is opened. The nitrogen purge valve 11 provided on the gas supply pipe 12 can be connected to the nitrogen gas source 8, and the gas supply pipe 12 is purged by nitrogen, and the gas is exhausted through the open end of the gas supply pipe 12, and the gas supply pipe 12 is filled with relatively safe nitrogen. The possibility of explosion of combustible gas in the gas supply pipe 12 during the process of gas entering the rotary kiln 10 from the gas supply pipe 12 is reduced, and the use safety of the rotary kiln 10 is improved. The two ends of the gas supply pipe 12 are connected to the combustible gas supply device 7 and the kiln head 101 respectively, and the gas in the combustible gas supply device 7 is conducted to the kiln head 101 to meet the combustion demand in the rotary kiln 10. The ignition device 4 provided at the kiln head 101 of the rotary kiln 10 ignites the combustible gas in the rotary kiln 10, and the rotary kiln 10 burns normally. The blower 2 whose outlet is connected to the kiln head 101 and the draft fan 3 whose inlet is connected to the kiln tail 102 of the rotary kiln 10 can control the flow of air in the rotary kiln 10 before and during the combustion of the rotary kiln 10, so that the combustible gas in the rotary kiln 10 can be burned more fully. It also reduces the potential safety hazard of gas explosion caused by incomplete combustion of the combustible gas. In conjunction with the nitrogen purge before the combustion of the rotary kiln 10, the combustible gas can also be burned more fully and reduce the potential safety hazard during use. To a certain extent, it solves the problem of the potential safety hazard caused by the difficulty in fully burning and incomplete combustion of the gas combustion. In addition, the on-off of both ends of the gas supply pipeline 12 can be controlled, which can also facilitate the control of the flow and cutoff between the combustible gas and the nitrogen and the rotary kiln 10.

[0046] It should be noted that Figure 1 The structure of the rotary kiln 10 is simplified.

[0047] In some embodiments provided in the present application, the combustible gas supply device 7 may be a container for carrying part of natural gas, etc., and the nitrogen gas source 8 may be a container for carrying part of nitrogen. The present application does not impose any limitation on this.

[0048] In some embodiments provided in the present application, the combustion system of the rotary kiln 10 further includes: a pressure detection gauge 5 respectively arranged at the outlet of the blower 2 and the inlet of the induced draft fan 3 .

[0049] The pressure detection gauge 5 provided at the outlet of the blower 2 and the inlet of the induced draft fan 3 can detect the pressure of the air flow passing through the blower 2 or the induced draft fan 3 to control the stable flow of the air flow so that the gas in the rotary kiln 10 can be burned more fully, thereby improving the working efficiency of the rotary kiln 10.

[0050] In some embodiments provided in the present application, the connectivity component 1 further includes:

[0051] A temperature sensor (not shown in the figure) is arranged in the rotary kiln 10 .

[0052] The solenoid valve 13 is disposed in the gas supply pipeline 12 and is electrically connected to the temperature sensor so as to close the gas supply pipeline 12 when the temperature sensor detects flameout.

[0053] The solenoid valve 13 cooperates with the temperature sensor, which is arranged in the rotary kiln 10. When the fire burning in the rotary kiln 10 is accidentally extinguished, the gas supply pipeline 12 can be automatically closed to prevent gas leakage after ignition failure or accidental extinguishment of the fire, thereby improving the overall safety of the rotary kiln 10 during combustion.

[0054] In some embodiments provided in the present application, the temperature sensor may be a thermocouple, which is easy to install and has a low manufacturing cost. The temperature sensor may also be configured as a different structure according to the application scenario, which is not limited in the present application.

[0055] In some embodiments provided in the present application, the connectivity component 1 further includes:

[0056] Both ends of the safety pipe 14 are connected to the gas supply pipe 12 and are spaced apart from each other.

[0057] The safety valve 15 is arranged on the safety pipeline 14 .

[0058] The safety pipe 14 constitutes a branch pipe of the gas supply pipe 12. A safety valve 15 is separately arranged on the safety pipe 14, which can release the pressure in the gas supply pipe 12 when the pressure in the gas supply pipe 12 is too high, thereby improving the overall safety of the combustion system of the rotary kiln 10. At the same time, it has no effect on the normal gas supply of the gas supply pipe 12. The safety pipe 14 can also increase the installation space for some valves in a limited space.

[0059] In some embodiments provided in the present application, the safety valve 15 may be a safety ball valve, which is not limited in the present application.

[0060] In some embodiments provided in the present application, the connecting component 1 also includes: an automatic relief valve 16 and a manual relief valve 17. The automatic relief valve 16 and the manual relief valve 17 are arranged in the safety pipe 14 at intervals and are both spaced apart from the safety valve 15. The automatic relief valve 16 and the manual relief valve 17 can both automatically release the pressure in the gas supply pipe 12, and the pressure release has a certain fault tolerance, which is beneficial to improving the overall safety of the combustion system of the rotary kiln 10. When the safety valve 15 and the automatic relief valve 16 are provided, it is also possible to purge the gas supply pipe 12 with nitrogen before ignition, and cooperate with the safety valve 15 and the automatic relief valve 16 to exhaust the air in the pipe to prevent explosion. The manual relief valve 17 can also be used for gas sampling and detection, and can be used to refer to the gas conditions in the gas supply pipe 12.

[0061] In some embodiments provided in the present application, two ends of the gas supply pipeline 12 are respectively connected to the combustible gas supply device 7 and the kiln head 101, and the connecting component 1 further includes:

[0062] At least two control valves 18 are respectively disposed at two ends of the gas supply pipeline 12 and located on both sides of the safety pipeline 14 .

[0063] At least two pressure gauges 19 are respectively disposed at two ends of the gas supply pipeline 12 and located on both sides of the safety pipeline 14 .

[0064] The two ends of the gas supply pipeline 12 are respectively connected to the combustible gas supply device 7 and the kiln head 101 of the rotary kiln 10, which can facilitate the connection between the combustible gas supply device 7 and the rotary kiln 10. The control valves 18 at both ends of the gas supply pipeline 12 can effectively realize the connection and closing of the two ends of the gas supply pipeline 12. It is convenient to control the flow and cutoff of the gas in the gas supply pipeline 12. The pressure gauge 19 set at both ends of the gas supply pipeline 12 can effectively control the stable delivery of the gas. And the control valve 18 and the pressure gauge 19 are both located at both ends of the gas supply pipeline 12, and the positions are both located on both sides of the safety pipeline 14. Then, the safety pipeline 14 and the safety valve 15 on the safety pipeline 14 and other structures are all located near the middle of the gas supply pipeline 12, with a certain buffer time, better pressure release effect, and higher safety.

[0065] In some embodiments provided in the present application, the control valve 18 may be a ball valve, an electric valve, or a hydraulic valve, which is not limited in the present application.

[0066] In some embodiments provided in the present application, the connecting component 1 further includes a pressure regulating valve 20 and a regulating valve 21. The pressure regulating valve 20 is arranged in the gas supply pipeline 12 and is spaced apart from the nitrogen purge valve 11, and the regulating valve 21 is located between the pressure regulating valve 20 and the rotary kiln 10. According to the flame combustion condition and the temperature in the kiln, the pressure regulating valve 20 can adjust the pressure, and the regulating valve 21 adjusts the opening to ensure that the temperature of the rotary kiln 10 is steadily increased. After the temperature in the rotary kiln 10 reaches the requirement, the regulating valve can be gradually closed until it is closed. It is convenient to adjust the combustion condition of the rotary kiln 10 to ensure that the combustion of the combustible gas in the rotary kiln 10 is relatively sufficient and stable.

[0067] In some embodiments provided in the present application, the combustion system of the rotary kiln 10 includes a burner 6. The burner 6 is provided with an air inlet 61 and a connecting port 62 which are spaced apart and connected, the air inlet 61 is connected to the ignition device 4, the air inlet 61 is also connected to the air supply pipe 12 and the blower 2, and the connecting port 62 is connected to the kiln head 101.

[0068] The air inlet 61 of the burner 6 is connected to the ignition device 4, and the air inlet 61 of the burner 6 is also connected to the air supply pipe 12 and the blower 2. The combustible gas in the air supply pipe 12 and the air in the blower 2 can enter the air supply pipe 12 from the air inlet 61 and then be partially mixed. After mixing, they enter the kiln head 101 of the rotary kiln 10 from the connection port 62. The ignition device 4 can ignite the combustible gas from the air inlet 61 of the burner 6, and ignite the combustible gas in the rotary kiln 10 through the connection port 62. This is conducive to the full combustion of the combustible gas in the rotary kiln 10.

[0069] In some embodiments provided by the present application, the combustion system of the rotary kiln 10 may also include at least one blower 2, and one blower 2 may be connected to the connection port 62 of the burner 6, and the other blower 2 may be directly connected to the kiln head 101 of the rotary kiln 10 through a pipeline. More sources of air can facilitate the adjustment of the ratio of oxygen to combustible gas in the gas in the rotary kiln 10, which is conducive to the full combustion of the combustible gas. At least two blowers 2 are provided at the same time, and the blowers 2 can also play a role of standby replacement with each other.

[0070] In some embodiments provided in this application, the ignition device 4 includes:

[0071] The ignition gun 41 is provided with an ignition port, and the ignition port is communicated with the kiln head 101 .

[0072] The control switch 42 is connected to the ignition gun 41 and is used to control the switch of the ignition gun 41 .

[0073] The ignition device 4 includes an ignition gun 41 and a control switch 42, which can be used to control the ignition gun 41 to ignite, so as to realize the combustion of combustible gas in the rotary kiln 10. In addition, the ignition gun 41 is relatively independent, which is also convenient for the ignition gun 41 to ignite the burner 6 or move the rotary kiln 10. When the burner 6 is set, the ignition device 4 can also be located at the kiln head 101, and connected to the kiln head 101 of the rotary kiln 10 through the burner 6.

[0074] In some embodiments provided by the present application, the pressure regulating valve 20 and the safety valve 15 can be fully opened, and the control valve 18, the nitrogen purge valve 11, the manual relief valve 17, and the control valve 18 connected to one end of the gas supply pipeline 12 and the rotary kiln 10 can be closed; the connecting component 1 is purged with nitrogen to prevent the mixture of air and natural gas from exploding. The blower 2 is set to start at 20HZ, and the induced draft fan 3 is operated at 1920HZ; the pressure gauge 19 on the side of the combustible gas supply device 7 is observed to be stable in the pressure range of 0.1-0.2MPa; the control valve 18 on the side of the combustible gas supply device 7 is opened, and it is slowly opened at 10% opening. After the pressure gauge 19 behind the pressure regulating valve 20 shows a stable reading of 12-18 KPa, fully open the control valve 18 on the side of the combustible gas supply device 7; fully open the control valve 18 at one end of the gas supply pipe 12 connected to the rotary kiln 10, insert the ignition gun 41 into the burner 6, start the control switch 42 to ignite, and take out the ignition gun 41 after ignition; according to the flame combustion situation and the temperature in the kiln, the opening of the regulating valve 21, the frequency of the blower 2 and the frequency of the induced draft fan 3 can be adjusted. After the temperature in the rotary kiln 10 reaches the requirement, the regulating valve 21 can be gradually closed until it is closed, and the two control valves 18 can be closed at the same time to complete the ignition.

[0075] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0076] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A rotary kiln combustion system, characterized in that: Applied to burning fuel in rotary kiln, including: Combustible gas supply equipment and nitrogen gas source; A connecting component, provided with a nitrogen purge valve and a gas supply pipeline with controllable on / off at both ends, the two ends of the gas supply pipeline are respectively used to connect the combustible gas supply equipment with the kiln head of the rotary kiln, and the nitrogen purge valve is arranged on the gas supply pipeline and is used to connect the nitrogen gas source; A blower, the outlet of which is connected to the kiln head; An induced draft fan, the inlet of which is connected to the kiln tail of the rotary kiln; The ignition device is arranged at the kiln head of the rotary kiln and is used for igniting the combustible gas in the rotary kiln.

2. The rotary kiln combustion system according to claim 1, characterized in that: The rotary kiln combustion system also includes: Pressure detection gauges are respectively arranged at the outlet of the blower and the inlet of the induced draft fan.

3. The rotary kiln combustion system according to claim 1, characterized in that: The connectivity component also includes: A temperature sensor is arranged in the rotary kiln; The solenoid valve is arranged in the air supply pipeline and is electrically connected to the temperature sensor so as to close the air supply pipeline when the temperature sensor detects flameout.

4. The rotary kiln combustion system according to any one of claims 1 to 3, characterized in that: The connectivity component also includes: A safety pipe, both ends of which are connected to the gas supply pipe and are spaced apart from each other; A safety valve is arranged on the safety pipeline.

5. The rotary kiln combustion system according to claim 4, characterized in that: The connectivity component also includes: The automatic relief valve and the manual relief valve are arranged at intervals in the safety pipeline and are both spaced apart from the safety valve.

6. The rotary kiln combustion system according to claim 4, characterized in that: The two ends of the gas supply pipeline are respectively connected to the combustible gas supply equipment and the kiln head, and the connecting component also includes: At least two control valves are respectively arranged at both ends of the gas supply pipeline and located on both sides of the safety pipeline; At least two pressure gauges are respectively arranged at two ends of the gas supply pipeline and located on both sides of the safety pipeline.

7. The rotary kiln combustion system according to any one of claims 1 to 3, characterized in that: The connectivity component also includes: a pressure regulating valve, disposed in the gas supply pipeline and spaced apart from the nitrogen purge valve; A regulating valve is arranged on the gas supply pipeline and is located between the pressure regulating valve and the rotary kiln.

8. The rotary kiln combustion system according to any one of claims 1 to 3, characterized in that: The rotary kiln combustion system comprises: The burner is provided with an air inlet and a connecting port which are spaced and connected. The air inlet is connected to the ignition device, the air inlet is also connected to the air supply pipeline and the blower, and the connecting port is connected to the kiln head.

9. The rotary kiln combustion system according to claim 8, characterized in that: The rotary kiln combustion system also includes: The outlet of one of the two blowers is connected to the connecting port of the burner, and the outlet of the other blower is connected to the kiln head through a pipeline.

10. The rotary kiln combustion system according to any one of claims 1 to 3, characterized in that: The ignition device comprises: An ignition gun, provided with an ignition port, the ignition port being communicated with the kiln head; A controller is connected to the ignition gun and is used to control the switch of the ignition gun.

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