A method for transporting lime pellets to prevent pulverization

Abstract

The present invention discloses a method for transporting lime pellets to prevent pulverization, which is characterized by comprising the following steps: sealing a transport vehicle and laying a layer of lime powder on the bottom of the transport vehicle compartment; equipping the transport vehicle with monitoring equipment, an information sharing device, an inflation device, and a controller; directly delivering the lime pellets into a container or transport vehicle for stacking, and then sprinkling a layer of lime powder on the surface; observing the overall state of the pellet surface through monitoring equipment and detecting the air conditions in the transport vehicle compartment; presetting remedial conditions, and when the monitored air conditions meet the remedial conditions, using the inflation device to replenish inert gas into the transport vehicle compartment; continuing transportation if the remedial conditions are not met; and finally arriving at a discharge point. The method for transporting lime pellets to prevent pulverization provided by the present invention effectively reduces the pulverization rate of lime pellets during transportation, reduces losses during transportation, and thus facilitates transportation.

Description

Technical Field

[0001] The invention relates to the technical field of lime pelletizing and anti-powdering transportation, in particular to a lime pelletizing and anti-powdering transportation method. Background Art

[0002] Lime briquette is a kind of granules or balls made by pressing lime powder into a mass. Its purpose is to reduce dust, control bulk density, return for use and improve transportation characteristics.

[0003] When lime balls are exposed outdoors, they will continuously react with water in the air to produce calcium hydroxide. During the whole process, the balls will gradually peel off and disintegrate, and eventually completely lose their strength and turn into powder. This is called the self-pulverization phenomenon of the balls.

[0004] The outermost layer of lime balls piled outdoors will be powdered in a short time, and the powdered outer layer of balls will act like a barrier to isolate the inner layer of balls from direct contact with the air, so the inner layer of balls can maintain their strength for a long time outdoors.

[0005] The process of self-pulverization of lime pellets is affected by many factors, including the specific surface area of ​​the pellets, the temperature and humidity of the pellet pile, the air flow rate and other factors. Among them, the absolute humidity of the pellet environment is the most influential factor in this process.

[0006] Active lime produces a large amount of fly ash during loading and unloading, conveyor belts and truck transportation, with a fly ash rate as high as 22%. The produced fly ash can only be sold to sintering plants at a low price, resulting in increased production costs.

[0007] In response to the problem of high fly ash rate, after visiting many metallurgical enterprises and conducting technical exchanges with many experts on how to reduce the fly ash rate, the optimization solutions obtained are: first, to reduce the fly ash generation rate; second, to press the fly ash into balls and then send them to steelmaking. By reducing the probability of fly ash generation and using the ball pressing technology, the company's economic benefits have increased.

[0008] With the increasing development of the steel industry, the demand for high-quality active lime is increasing. However, active lime briquettes produce a large amount of fly ash during transportation. Refining high-quality steel requires 40 to 80 m of ash, and fly ash is difficult to smelt in blast furnaces.

[0009] Therefore, it is necessary to carry out technical transformation on the active lime pelletizing and transportation process to reduce the crushing rate of lime pellets during transportation. Summary of the Invention

[0010] In view of the shortcomings of the existing technology, the present invention provides a method for transporting lime pellets to prevent them from being pulverized, with the aim of solving the problem that lime pellets are prone to being pulverized in large quantities during transportation.

[0011] To achieve the above object, the present invention provides the following technical solutions:

[0012] A method for transporting lime pellets to prevent pulverization, comprising the following steps:

[0013] Step 1: The transport vehicle is sealed by using kraft paper, oilcloth and rubber rings to seal the transport vehicle compartment, and a layer of lime powder is laid on the bottom of the transport vehicle compartment;

[0014] The transport vehicle is equipped with a monitoring device, an information sharing device, an inflation device and a controller, and the monitoring device, the information sharing device and the inflation device are all electrically connected to the controller, and the signals and controls are connected through the controller;

[0015] Step 2: Press the lime balls within a fixed time, and the lime balls are directly put into the transport vehicle after being pressed into shape;

[0016] Step 3: Pile the lime balls in the transport truck compartment and then sprinkle a layer of lime powder on the surface.

[0017] Step 4: Observe the overall state of the ball pressing surface through monitoring equipment and detect the air conditions in the transport vehicle compartment;

[0018] Step 5: Preset remedial conditions. When the monitored air conditions meet the remedial conditions, use the inflation device to add inert gas to the transport vehicle compartment;

[0019] If the remediation conditions are not met, the transport will continue;

[0020] Step 6: Arrive at the unloading point.

[0021] Preferably, the monitoring equipment includes a camera and an air index detector.

[0022] Preferably, the thickness of the lime powder is h1:

[0023]

[0024] Among them, f represents the real-time relative humidity, f0 represents the relative humidity when the lime pelletizing speed is at its maximum limit, F represents the real-time absolute humidity, F0 represents the absolute humidity when the lime pelletizing speed is at its maximum limit, t represents the transportation time in hours, and h1 is in mm.

[0025] Preferably, the thickness of the lime powder sprinkled on the surface is h2:

[0026]

[0027] The unit of h2 is mm.

[0028] Preferably, the air conditions include oxygen content, absolute humidity and temperature.

[0029] Preferably, the rate of filling with inert gas is V:

[0030]

[0031] Among them, O represents the real-time oxygen content, O0 represents the oxygen content when the lime ball pulverization speed is maximized, T represents the real-time temperature, and T0 represents the temperature when the lime ball pulverization speed is maximized.

[0032] Preferably, the height of the loaded pressure balls cannot exceed 1m.

[0033] Preferably, the monitoring equipment also includes a GPS positioning device.

[0034] Preferably, an air valve is provided in the transport vehicle compartment for exhausting air to the outside.

[0035] Preferably, an air storage box is provided in the compartment of the transport vehicle, inert gas is stored in the air storage box, an air outlet pipe with a solenoid valve is provided on the side of the air storage box, and the solenoid valve is connected to the controller.

[0036] Beneficial effects

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention provides a method for transporting lime pellets to prevent them from pulverizing. The present invention adopts bottom-line thinking and, based on the fact that lime pellets will pulverize during storage and transportation, provides technical support for comprehensively and accurately controlling the storage and transportation process of lime pellets.

[0039] Furthermore, through the coordination of various devices and structures, combined with the transportation method of the present application, the pulverization rate of lime balls during transportation is effectively reduced, and the loss during transportation is reduced, thereby making transportation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of a method for transporting lime pellets to prevent pulverization according to the present invention;

[0041] Figure 2 Comparison of drop test results of newly made press balls after being stacked in the chamber for 0 hours (left) and 4 hours (right). DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] In this embodiment, the following method is included:

[0044] After receiving the lime briquette order, the lime briquette is pressed within a fixed time. After the lime briquette is pressed and formed, it is directly put into the transport vehicle to ensure that the briquette has less contact with the air and slow down the pulverization.

[0045] In order to prevent the compressed balls from excessively coming into contact with air during transportation, the containers / transport vehicles are sealed using materials such as kraft paper, tarpaulin and rubber rings. Different orders have different sealing materials.

[0046] During the loading and unloading process, strict operating procedures are adopted to minimize the amount of dust generated; protective covers are added to the transport vehicles, which not only reduces wind erosion but also prevents pollution to the environment on both sides of the road; a layer of lime powder is spread on the bottom or surface layer with a thickness of h1 to prevent the lime balls from coming into contact with the free air on the surface and accelerating their pulverization. The thickness of the lime powder is related to the distance from the order and the air humidity on that day:

[0047]

[0048] Among them, f represents the real-time relative humidity, f0 represents the relative humidity when the lime pelletizing speed is at its maximum limit, F represents the real-time absolute humidity, F0 represents the absolute humidity when the lime pelletizing speed is at its maximum limit, t represents the transportation time in hours, and h1 is in mm.

[0049] Furthermore, the thickness of the lime paving can reduce the wear and tear of the pressed balls. Figure 2 It can be seen that the soft ground surface can significantly reduce the crushing of the pressure ball.

[0050] The base of the packaging transport device is fixedly connected with shock-absorbing wheels, handles and a cargo compartment, and is provided with a viewing window and a discharge port, etc., all of which aim to reduce excessive contact with air and wear during transportation.

[0051] In order to further reduce the pulverization rate of lime balls, a layer of lime powder with a thickness of h2 is sprinkled on the surface of the piled lime balls, which can reduce the contact between the lime balls and the air to a certain extent and reduce the pulverization rate of the lime balls:

[0052]

[0053] The unit of h2 is mm.

[0054] The packaging and transport device (container / transport vehicle) is equipped with a monitoring platform (camera, temperature sensor and air index detector). The monitoring platform mainly refers to the ability to observe the overall state of the surface of the pressed ball and detect the state of its internal environment (air humidity, oxygen content and temperature, etc. The specific detection method is the existing method of camera, temperature sensor and air index detector, and the signal transmission method is also existing, so the details will not be repeated).

[0055]

[0056] The above table shows the time required for the pellets to self-powder under different conditions at a temperature of 25°C. As the temperature rises, the time required for powdering becomes shorter. Therefore, it is necessary to monitor various data in real time through a monitoring platform, and then fill in dry inert gas (such as nitrogen) at a certain speed according to the changes in the data. This can replace the moisture-containing air in the storage and transportation device, making the storage and transportation device drier. The inert gas is stored in the air storage box installed in the carriage of the transport vehicle.

[0057] In this embodiment, the rate of inert gas filling is V:

[0058]

[0059] Among them, O represents the real-time oxygen content, O0 represents the oxygen content when the lime ball pulverization speed is maximized, T represents the real-time temperature, and T0 represents the temperature when the lime ball pulverization speed is maximized.

[0060] The maximum limit of the lime ball pulverization speed mentioned in the above embodiment means that the lime ball pulverization rate is generally required to be no more than 22%. In this application, the pulverization rate is set to no more than 12%. At this time, the pulverization speed is the maximum limit of the pulverization speed.

[0061] By using the above method, we can reduce the fly ash rate to about 11% to 12%.

[0062] During the transportation process, the vehicle can be monitored in real time, GPS-located, and its speed and operation can be controlled to ensure that it arrives at the destination within the time required by the customer. After arriving at the destination, the vehicle can be fully inspected and confirmed to have arrived at the destination.

[0063] In another embodiment, the pulverization speed is set to be the maximum limit of the pulverization speed when the pulverization rate is 10%.

[0064] Similarly, by using the above method, we can reduce the fly ash rate to about 9% to 11%.

[0065] The following table shows the crushing rate of lime pellets at different transportation times and under different conditions:

[0066]

[0067]

[0068] From the above table, we can clearly see that compared with the use of existing transportation methods, only adopting some measures of this application can effectively reduce the crushing rate, and fully using the method of this application can greatly reduce the crushing rate of lime balls during transportation, and as the transportation time increases, the effect of reducing the crushing rate is more obvious.

[0069] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0070] While embodiments of the present invention have been shown and described, it will be appreciated 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 invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for transporting lime pellets to prevent pulverization, characterized in that: The steps include: Step 1: The transport vehicle is sealed by using kraft paper, oilcloth and rubber rings to seal the transport vehicle compartment, and a layer of lime powder is laid on the bottom of the transport vehicle compartment; The transport vehicle is equipped with a monitoring device, an information sharing device, an inflation device and a controller, and the monitoring device, the information sharing device and the inflation device are all electrically connected to the controller, and the signals and controls are connected through the controller; Step 2: Press the lime balls within a fixed time, and the lime balls are directly put into the transport vehicle after being pressed into shape; Step 3: Pile the lime balls in the transport vehicle compartment and then sprinkle a layer of lime powder on the surface; Step 4: Observe the overall state of the ball pressing surface through monitoring equipment and detect the air conditions in the transport vehicle compartment; Step 5: Preset remedial conditions. When the monitored air conditions meet the remedial conditions, use the inflation device to add inert gas to the transport vehicle compartment; If the remediation conditions are not met, the transport will continue; Step 6: Arrive at the unloading point.

2. A method for transporting lime pellets to prevent pulverization according to claim 1, characterized in that: The monitoring equipment includes a camera and an air index detector.

3. The method for transporting lime pellets to prevent pulverization according to claim 1, wherein: The thickness of lime powder is h1: Among them, f represents the real-time relative humidity, f0 represents the relative humidity when the lime pelletizing speed is at its maximum limit, F represents the real-time absolute humidity, F0 represents the absolute humidity when the lime pelletizing speed is at its maximum limit, t represents the transportation time in hours, and h1 is in mm.

4. The method for transporting lime pellets to prevent pulverization according to claim 1, wherein: The thickness of the lime powder sprinkled on the surface is h2: The unit of h2 is mm.

5. The method for transporting lime pellets to prevent pulverization according to claim 1, characterized in that: The air conditions include oxygen content, absolute humidity and temperature.

6. A method for transporting lime pellets to prevent pulverization according to claim 5, characterized in that: The rate of inert gas filling is V: Among them, O represents the real-time oxygen content, O0 represents the oxygen content when the lime ball pulverization speed is maximized, T represents the real-time temperature, and T0 represents the temperature when the lime ball pulverization speed is maximized.

7. The method for transporting lime pellets to prevent pulverization according to claim 1, characterized in that: The height of the installed pressure balls cannot exceed 1m.

8. The method for transporting lime pellets to prevent pulverization according to claim 1, characterized in that: The monitoring equipment also includes a GPS positioning device.

9. The method for transporting lime pellets to prevent pulverization according to claim 1, characterized in that: An air valve is provided inside the transport vehicle compartment for exhausting air to the outside.

10. The method for transporting lime pellets to prevent pulverization according to claim 1, characterized in that: An air storage box is provided in the carriage of the transport vehicle, in which inert gas is stored. An air outlet pipe with a solenoid valve is provided on the side of the air storage box, and the solenoid valve is connected to the controller.

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