Cooling air heat circulation system for feeding hopper of circular cooler

Abstract

The invention provides a circular cooler feeding hopper cooling air heat circulation system which comprises a cooling pipeline, a circular cooler feeding hopper, a hot air pipeline and a main combustor, the outlet end of the cooling pipeline communicates with the circular cooler feeding hopper, and a cooling fan is arranged on the cooling pipeline so that cooling gas can be guided into the circular cooler feeding hopper through the cooling pipeline, and the hot air pipeline is communicated with the main combustor. The hot air pipeline is communicated with the feeding hopper of the circular cooler and the main combustor so that gas heated by the feeding hopper of the circular cooler can be guided into the main combustor. By arranging the hot air pipeline, high-temperature hot air cooled by the feeding hopper of the circular cooler can be introduced into the main combustor to participate in combustion, energy waste caused by direct discharge of the high-temperature hot air is avoided, and the energy utilization efficiency is improved. The high-temperature hot air serves as the combustion-supporting air of the main combustor, the temperature of the high-temperature hot air is higher than that of normal-temperature combustion-supporting air used in the prior art, more favorable conditions can be provided for combustion, fuel combustion is more sufficient, fuel consumption of the main combustor is reduced, and the energy cost in the production process is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of pellet production, and specifically relates to a cooling air heat circulation system for a ring cooler feed hopper. Background Art

[0002] In existing technology, the "grate conveyor - rotary kiln - ring cooler" process is one of the main production processes for iron ore pellets. In this process, the ring cooler feed hopper operates at high temperatures for extended periods of time. To ensure stable operation, the ring cooler feed hopper is equipped with a separate cooling fan. The cooling fan draws ambient air into the ring cooler feed hopper to cool it, and the hot air is then directly discharged through a duct. However, the hot air is high-temperature and free of harmful substances, so direct discharge results in energy waste. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present application is to provide a cooling air heat circulation system for the feeding hopper of the ring cooler, which can realize the recycling of the cooling gas of the feeding hopper of the ring cooler while ensuring the stable operation of the feeding hopper of the ring cooler.

[0004] In order to solve the above problems, the present application provides a ring cooler feed hopper cooling air heat circulation system, including a cooling pipe, a ring cooler feed hopper, a hot air pipe and a main burner, the outlet end of the cooling pipe is connected to the ring cooler feed hopper, and a cooling fan is provided on the cooling pipe to introduce the cooling gas into the ring cooler feed hopper through the cooling pipe, and the hot air pipe is respectively connected to the ring cooler feed hopper and the main burner to introduce the gas heated by the ring cooler feed hopper into the main burner.

[0005] Optionally, the inlet end of the cooling fan is connected to the external environment so that air at normal temperature is sucked into the cooling fan as the cooling gas.

[0006] Optionally, the outlet end of the cooling pipe is arranged at one end of the feeding hopper of the ring cooler, and the inlet end of the hot air pipe is arranged at the other end of the feeding hopper of the ring cooler.

[0007] Optionally, the cooling fan is a Roots blower.

[0008] Optionally, the main burner is not provided with a combustion-supporting fan.

[0009] Optionally, a first temperature sensor is provided at the outlet end of the hot air duct, and a flow regulating valve is provided on the hot air duct.

[0010] Optionally, a second temperature sensor is provided on the feeding hopper of the ring cooler, and the cooling fan is a variable frequency fan.

[0011] Optionally, there are multiple second temperature sensors, and the multiple second temperature sensors are evenly arranged on the outer wall of the ring cooler feed hopper.

[0012] Optionally, a heat-insulating layer is provided on the hot air duct.

[0013] Optionally, the insulation layer is arranged on the outer wall of the hot air duct.

[0014] Beneficial effects:

[0015] A cooling air heat circulation system for the annular cooler feed hopper provided in an embodiment of the present invention can introduce cooling gas into the annular cooler feed hopper by setting a cooling pipe and a cooling fan, thereby cooling the annular cooler feed hopper. By setting a hot air pipe and connecting the hot air pipe to the annular cooler feed hopper and the main burner respectively, the high-temperature hot air after cooling the annular cooler feed hopper can be introduced into the main burner to participate in combustion, thereby avoiding the energy waste caused by the direct discharge of high-temperature hot air, effectively utilizing the heat generated during the cooling process, and improving energy utilization efficiency. Moreover, by using the high-temperature hot air after cooling the annular cooler feed hopper as the combustion-supporting air of the main burner, its temperature is higher than the normal-temperature combustion-supporting air used in the prior art, which can provide more favorable conditions for combustion, make the fuel burn more fully, thereby reducing the fuel consumption of the main burner and reducing the energy cost in the production process. In addition, the method of directly discharging the cooling air in the prior art is changed and recycled, thereby reducing the amount of gas discharged in industrial production and reducing air pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a system schematic diagram of the cooling air heat circulation system of the ring cooler feed hopper of an embodiment of the present application.

[0017] The reference numerals indicate:

[0018] 1. Cooling fan; 2. Cooling pipe; 3. Annular cooler feed hopper; 4. Hot air pipe; 5. Main burner. DETAILED DESCRIPTION

[0019] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships 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 should not be understood as limiting the present invention.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0021] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0022] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0023] See also Figure 1 As shown, according to an embodiment of the present application, a ring cooler feed hopper cooling air heat circulation system is provided, including a cooling pipe 2, a ring cooler feed hopper 3, a hot air pipe 4 and a main burner 5. The outlet end of the cooling pipe 2 is connected to the ring cooler feed hopper 3, and a cooling fan 1 is provided on the cooling pipe 2 to introduce the cooling gas into the ring cooler feed hopper 3 through the cooling pipe 2. The hot air pipe 4 is respectively connected to the ring cooler feed hopper 3 and the main burner 5 to introduce the gas heated by the ring cooler feed hopper 3 into the main burner 5.

[0024] By setting up a cooling pipe 2 and a cooling fan 1, the cooling gas can be introduced into the annular cooler feed hopper 3, thereby cooling the annular cooler feed hopper 3. By setting up a hot air pipe 4 and connecting the hot air pipe 4 to the annular cooler feed hopper 3 and the main burner 5 respectively, the high-temperature hot air after cooling the annular cooler feed hopper 3 can be introduced into the main burner 5 to participate in combustion, thereby avoiding the energy waste caused by the direct discharge of the high-temperature hot air, effectively utilizing the heat generated during the cooling process, and improving energy utilization efficiency. Moreover, by using the high-temperature hot air after cooling the annular cooler feed hopper 3 as the combustion-supporting air of the main burner 5, its temperature is higher than the normal-temperature combustion-supporting air used in the prior art, which can provide more favorable conditions for combustion, make the fuel burn more fully, thereby reducing the fuel consumption of the main burner 5 and reducing the energy cost in the production process. In addition, the method of directly discharging the cooling air in the prior art is changed and recycled, thereby reducing the amount of gas discharged in industrial production and reducing air pollution.

[0025] The outlet end of the cooling pipe 2 is connected to the space where the annular cooler feed hopper 3 is located, and the cooling gas is introduced into the space where the annular cooler feed hopper 3 is located to cool the annular cooler feed hopper 3.

[0026] Among them, the inlet end of the hot air duct 4 is connected to the space where the annular cooler feed hopper 3 is located, and the outlet end of the hot air duct 4 is connected to the main burner 5, thereby introducing the cooling gas heated by the annular cooler feed hopper 3 into the main burner 5.

[0027] The inlet end of the cooling fan 1 is connected to the external environment so that air at normal temperature is sucked into the cooling fan 1 as cooling gas.

[0028] Normal temperature air is used as the cooling gas, and no additional preparation or transportation is required, and the cooling gas can be directly inhaled through the cooling pipe 2, thereby reducing the acquisition cost of the cooling gas and the complexity of the system.

[0029] The cooling fan 1 may be arranged at the inlet end of the cooling pipe 2 , or may be arranged between the inlet end and the outlet end of the cooling pipe 2 .

[0030] The outlet end of the cooling pipe 2 is arranged at one end of the feeding hopper 3 of the ring cooler, and the inlet end of the hot air pipe 4 is arranged at the other end of the feeding hopper 3 of the ring cooler.

[0031] By locating the outlet of the cooling duct 2 and the inlet of the hot air duct 4 at either end of the feed hopper, room-temperature air entering from one end can flow along the entire length of the feed hopper, fully absorbing heat from high-temperature areas of the equipment. This convection layout reduces short-circuiting and localized stagnation of cooling gas, ensuring effective cooling in all areas of the feed hopper and preventing localized overheating of the equipment due to uneven cooling. It also allows the cooling gas to flow longer within the feed hopper, increasing its contact time with high-temperature equipment surfaces and improving heat exchange efficiency.

[0032] The outlet end of the cooling pipe 2 is connected to one end of the space where the annular cooler feed hopper 3 is located, and the inlet end of the hot air pipe 4 is connected to the other end of the space where the annular cooler feed hopper 3 is located.

[0033] Specifically, the outlet end of the cooling pipe 2 can be arranged below the feeding hopper 3 of the ring cooler, and the inlet end of the hot air pipe 4 can be arranged above the feeding hopper 3 of the ring cooler.

[0034] In this embodiment, the cooling fan 1 is a Roots blower.

[0035] The Roots blower is a positive displacement cooling blower 1, which delivers a fixed volume of gas through the rotation of its impeller. Its flow rate is minimally affected by pressure fluctuations. In the cooling system of the annular cooler's feed hopper 3, it ensures that ambient air enters the cooling duct 2 at a steady flow rate, ensuring a stable cooling effect.

[0036] The main burner 5 is not provided with a combustion-supporting blower.

[0037] By eliminating the combustion-supporting blower previously used in the main burner 5, procurement costs are reduced. Conventional combustion-supporting blowers are typically Roots blowers, which are expensive to purchase. Eliminating this feature reduces equipment investment. Furthermore, eliminating the combustion-supporting blower eliminates the need for equipment maintenance, eliminating routine maintenance tasks such as inspections, bearing lubrication, and impeller replacement. This reduces maintenance labor costs and spare parts expenses, while also minimizing the risk of production downtime due to combustion-supporting blower failure.

[0038] By arranging a cooling fan 1 on the cooling duct 2 and using a Roots blower as the cooling fan 1 on the cooling duct 2, not only can external air be driven into the cooling duct 2, but also the gas in the hot air duct 4 can be driven into the main burner 5, thereby achieving dual purposes of one machine, optimizing the power system configuration, and avoiding energy waste.

[0039] A first temperature sensor is provided at the outlet end of the hot air duct 4 , and a flow regulating valve is provided on the hot air duct 4 .

[0040] By installing the first temperature sensor at the outlet end of the hot air duct 4, the hot air temperature data entering the main burner 5 can be collected and accurately obtained in real time, and the flow rate of the gas in the hot air duct 4 can be adjusted according to the hot air temperature data.

[0041] The flow rate can be adjusted by manually adjusting the flow control valve, or by automatically adjusting the flow rate.

[0042] Specifically, when the automatic flow adjustment method is adopted, a first temperature sensor is set at the outlet end of the hot air pipe 4 and a flow regulating valve is configured on the pipe. Through real-time monitoring and dynamic adjustment, the temperature of the gas entering the main burner 5 is ensured to be stable in a reasonable range. The first temperature sensor can obtain the hot air temperature change in real time and feed it back to the control system. When the temperature fluctuates, the flow regulating valve automatically adjusts the opening according to the sensor signal. If the temperature is lower than the set value, the valve opening is reduced to reduce the hot air discharge volume, so that more cooling gas can fully absorb heat and heat up in the annular cooler feed hopper 3. If the temperature is higher than the set value, the valve opening is increased to speed up the hot air delivery to avoid excessive temperature affecting the combustion stability. By forming a closed-loop control, the influence of the temperature fluctuation of the annular cooler feed hopper 3 or the change of the cooling air volume on the hot air temperature can be effectively offset, and a temperature-stable combustion-supporting gas is provided to the main burner 5 to ensure combustion efficiency and process stability.

[0043] The first temperature sensor can be selected to meet the requirements of room temperature up to 250°C. For example, a PT100 thermal resistor temperature sensor can be selected. The flow control valve can be an electric regulating butterfly valve, such as an SKD62 electric butterfly valve.

[0044] The first temperature sensor is fixedly attached to the inner wall of the hot air duct 4, and the flow control valve can be connected to the hot air duct 4 via a flange connection. The specific installation method is conventional in the art and is not detailed here. A second temperature sensor is installed on the ring cooler feed hopper 3, and the cooling fan 1 is a variable frequency fan.

[0045] By installing a second temperature sensor on the cooling machine feed hopper 3, real-time surface or internal temperature data can be collected to accurately reflect whether the operating temperature is within the safe range. By using a variable frequency fan, the speed of the cooling fan 1 can be adjusted, thereby adjusting the air volume.

[0046] The speed of the cooling fan 1 can be adjusted manually, or the air volume can be adjusted automatically.

[0047] Specifically, when the automatic adjustment method is adopted, the second temperature sensor collects its temperature in real time and converts it into a current signal or a digital signal and transmits it to the PLC. The target temperature range of the feed hopper and the speed adjustment range of the variable frequency fan are preset in the PLC. When the sensor detects that the feed hopper temperature is higher than the upper limit of the target value, the PLC calculates the temperature deviation and outputs a frequency adjustment signal to the variable frequency fan control cabinet, so that the speed of the cooling fan 1 increases and the cooling air volume increases, thereby enhancing the cooling of the feed hopper. When the temperature is lower than the lower limit of the target value, the PLC controls the speed of the cooling fan 1 to decrease and reduce the cooling air volume to avoid overcooling. Through closed-loop control, the feed hopper temperature is stabilized within the set range, and the cooling air volume is adjusted on demand, thereby improving the energy saving and cooling efficiency of the system.

[0048] Specifically, the second temperature sensor may be a PT100 thermal resistor temperature sensor. The cooling fan 1 may be a variable frequency Roots blower.

[0049] Specifically, there are multiple second temperature sensors, and the multiple second temperature sensors are evenly arranged on the outer wall of the feeding hopper of the annular cooler.

[0050] The hot air duct 4 is provided with a heat-insulating layer. Specifically, the heat-insulating layer is provided on the outer wall of the hot air duct 4.

[0051] By providing a thermal insulation layer, heat transfer can be effectively blocked, ensuring that the gas temperature in the hot air duct 4 is stable.

[0052] Specifically, the insulation layer can be made of insulation materials such as rock wool and aluminum silicate.

[0053] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0054] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A cooling air heat circulation system for a ring cooler feed hopper, characterized in that: The invention comprises a cooling pipe (2), an annular cooler feed hopper (3), a hot air pipe (4) and a main burner (5); the outlet end of the cooling pipe (2) is connected to the annular cooler feed hopper (3); a cooling fan (1) is provided on the cooling pipe (2) to introduce cooling gas into the annular cooler feed hopper (3) via the cooling pipe (2); the hot air pipe (4) is respectively connected to the annular cooler feed hopper (3) and the main burner (5) to introduce the gas heated by the annular cooler feed hopper (3) into the main burner (5).

2. The cooling air heat circulation system for the feeding hopper of the ring cooler according to claim 1 is characterized in that: The inlet end of the cooling fan (1) is connected to the external environment so that air at normal temperature is sucked into the cooling fan (1) as the cooling gas.

3. The cooling air heat circulation system for the feeding hopper of the ring cooler according to claim 1 is characterized in that: The outlet end of the cooling pipe (2) is arranged at one end of the annular cooler feed hopper (3), and the inlet end of the hot air pipe (4) is arranged at the other end of the annular cooler feed hopper (3).

4. The cooling air heat circulation system for the feeding hopper of the ring cooler according to claim 1, characterized in that: The cooling fan (1) is a Roots blower.

5. The cooling air heat circulation system for the feeding hopper of the ring cooler according to claim 1 is characterized in that: The main burner (5) is not provided with a combustion-supporting blower.

6. The cooling air heat circulation system for the feeding hopper of the ring cooler according to claim 1, characterized in that: A first temperature sensor is provided at the outlet end of the hot air duct (4), and a flow regulating valve is provided on the hot air duct (4).

7. The cooling air heat circulation system for the feeding hopper of the ring cooler according to claim 1, characterized in that: The ring cooler feed hopper (3) is provided with a second temperature sensor, and the cooling fan (1) is a variable frequency fan.

8. The cooling air heat circulation system for the feeding hopper of the ring cooler according to claim 7, characterized in that: There are multiple second temperature sensors, and the multiple second temperature sensors are evenly arranged on the outer wall of the ring cooler feeding hopper.

9. The cooling air heat circulation system for the feeding hopper of the ring cooler according to claim 1, characterized in that: The hot air duct (4) is provided with a heat insulation layer.

10. The cooling air heat circulation system for the feeding hopper of the ring cooler according to claim 9, characterized in that: The heat-insulating layer is arranged on the outer wall of the hot air duct (4).

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