CN112007743A - A system for preparing modified blue carbon - Google Patents

Abstract

The invention relates to a preparation system for modified blue charcoal, comprising feeding equipment, conveying equipment, screening equipment, unloading equipment and detection equipment, as well as modification equipment, and the modification equipment is pressure crushing equipment. Feeding equipment includes vibrating feeder, quantitative feeder and forced feeder, and the forced feeder preferably twin-screw compression feeder provides pre-pressed feed for the reforming equipment. The pressure crushing device is preferably a static pressure crusher, especially a high static pressure roller press. The conveying equipment includes a conveyor belt, the screening equipment includes a vibrating screen, the unloading equipment is preferably a plow unloader, and the testing equipment includes a drying box, a muffle furnace, an analytical balance, a sulfur analyzer, a sample making machine and a jaw crusher. The modified blue charcoal produced by this system can partially or completely replace coal as the blast furnace injection raw material.

Description

A system for preparing modified blue carbon

technical field

The invention belongs to an energy raw material preparation system, in particular to a modified blue carbon preparation system.

Background technique

As a new type of carbon material, blue carbon has become an irreplaceable material due to its high fixed carbon, high specific resistance, high chemical activity, low ash content, low aluminum, low sulfur and low phosphorus. After the Ministry of Industry and Information Technology issued the coking product access policy in 2014, blue carbon entered people's field of vision. In 2016, it was officially included in the ranks of clean energy by the country, and it was comprehensively promoted and used nationwide, and gradually promoted blue carbon to replace coke (metallurgical coke). Widely used in chemical, smelting, gas production and other industries to control coal combustion pollution.

The amount of coal used by iron and steel enterprises in blast furnace injection is very large, so it is of great significance to use blue carbon instead of coal in the injection process. At present, the use of blue carbon instead of coal as the blast furnace injection raw material has a theoretical basis, but there are still great difficulties in practical application. The biggest obstacles are mainly reflected in two aspects:

(1) The most important thing is that the current Hastelloy grindability index of blue carbon is low, so that the pulverizing capacity of medium-speed grinding cannot meet the needs of blast furnaces. The reason for this phenomenon is mainly determined by the structural characteristics of blue charcoal itself. On the one hand, the hardness of blue charcoal is higher than that of bituminous coal, making it difficult to grind it. On the other hand, its structural form is denser than bituminous coal. 1(a) shows the microstructure of blue carbon. It can be seen from the figure that the microstructure of blue carbon has no obvious voids, while in the microstructure of bituminous coal shown in Figure 1(b), obvious microscopic voids can be seen. Its strength decreases, making it more fragile.

The low grindability of blue carbon has seriously affected the pulverizing efficiency, making it difficult to meet the production requirements of the medium-speed mill, and thus unable to increase the proportion of blue carbon in the pulverized coal injection. It can be seen from Figure 2 The change of the Hastelloy grindability index during the mixing process of blue carbon and bituminous coal does not show a linear relationship. The addition of blue carbon makes the Hastelloy grindability index of the mixed pulverized coal drop sharply. When the mixing ratio reaches 50%, the Hastelloy can be The grindability index is almost the same as the Hastelloy grindability index of the blue carbon itself, so in order to make the Hastelloy grindability index of the mixed pulverized coal meet the requirements, the mixing ratio of blue carbon is low. At present, the mixing ratio of iron and steel enterprises using blue carbon for blast furnace injection is generally 10%-15%, and the maximum is not more than 25%. It is difficult to completely replace pulverized coal, which seriously affects the realization of the process of decoalization.

(2) The wear of the blue carbon on the conveying equipment is serious, which shortens the replacement cycle of the equipment and increases the production cost. There are several reasons for this phenomenon. First, the hardness of blue carbon is relatively large; second, the microstructure of blue carbon has sharp edges and corners, as shown in Figure 3; third, blue carbon particles show obvious lamellae. like structure, may produce cutting effect during contact with the blowing equipment. All of the above conditions will aggravate the wear of the injection equipment.

At present, iron and steel enterprises that use blue carbon as raw material for blast furnace injection have not taken effective measures against the above problems. And relieve the wear and tear of the blowing equipment.

Based on the above analysis, there is an urgent need for a blue carbon powder that can process the existing blue carbon to obtain blue carbon powder with a higher Hastelloy grindability index. A modified blue carbon preparation system is developed to achieve blue carbon powder with higher Hastelloy grindability index.

SUMMARY OF THE INVENTION

One object of the present invention is to propose a modified blue carbon preparation system, so as to efficiently prepare and obtain blue carbon powder with high Hastelloy grindability index.

The modified blue charcoal preparation system of the present application includes feeding equipment, conveying equipment, screening equipment, unloading equipment and testing equipment, and the system also includes modification equipment, which is hydrostatic pressure crushing equipment. The static pressure crushing equipment is a high static pressure crushing equipment. Wherein, the high static pressure crushing equipment is a high static pressure roller press. Feeding equipment includes vibratory feeders, quantitative feeders and forced feeders. The forced feeder is a pre-pressed forced feeder. A twin-screw compression feeder is used as a pre-compression forced feeder. The conveying equipment is a conveyor belt, with a total of 14 pieces, consisting of a frame, a conveying belt, a belt roller, a tensioning device and a motor, which are respectively set between the quantitative feeder and the forced feeder; high static pressure roller press Between the screening system and the screening system; between the screening system and the receiving pit; between the screening system and the finished product storage area. The screening equipment includes a vibrating screen. The discharge device is a plow discharger. The detection equipment includes a drying box, a muffle furnace, an analytical balance, a sulfur analyzer, a calorimeter, a Hastelloy grinder, a sample making machine and a jaw crusher. The modified blue charcoal prepared by this system can partially or completely replace coal as the blast furnace injection raw material.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

Figure 1(a) is the microstructure of blue carbon;

Figure 1(b) is the microstructure of bituminous coal;

Fig. 2 is the influence of blue carbon mixing ratio on Hastelloy grindability index;

Figure 3 is the external microstructure of blue carbon;

Fig. 4 is the technological process of existing pulverized coal blue carbon mixed injection;

5 is a schematic diagram of a modified blue carbon preparation system of the present invention;

Fig. 6 is the schematic diagram of the second embodiment of the modified blue carbon preparation system of the present invention;

7 is a schematic diagram of the third embodiment of the modified blue carbon preparation system of the present invention.

1. Vibrating feeder; 2. Quantitative feeder; 3. Belt conveyor; 3.1. The first conveyor belt; 3.2. The second conveyor belt; 3.3. The third conveyor belt group; 3.4. The fourth conveyor belt group; 4. Forced feeder; 5. High static pressure roller press; 6. Vibrating screen; 7. Unloading trolley.

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

The first embodiment of the modified blue charcoal preparation system of the present invention, as shown in FIG. 5, specifically includes: two vibrating feeders 1, which are used in the production process to transfer the bulk and granular materials from the storage materials The silo is evenly, regularly and continuously fed to the receiving device, and in the production line, it can be continuously and evenly fed to the crushing machine. It is characterized by simple structure, uniform feeding, good continuous performance, adjustable excitation force, changing and controlling flow at any time, and easy operation. It is used to carry out the blanking operation for two or more selected blue carbon raw materials. After the raw material ratio is determined, the blanking is carried out according to the ratio set by the program. Two vibrating feeders 1 are respectively connected to two quantitative feeders 2, and the two quantitative feeders are connected by a feeding belt conveyor 3, which continuously weighs bulk materials. quantity feeding. It can transmit the load and speed signals to the measurement control instrument or the industrial computer. The instrument or the industrial computer calculates the actual feeding amount by performing internal operations on the load and speed signals, and continuously compares the actual feeding amount with the set feeding amount. , so as to control the speed of the conveyor belt so that the feeding amount is as close to or equal to the set feeding amount as possible. The blue carbon raw material dropped by the vibrating feeder passes through the quantitative feeder to determine the blanking amount of the raw material according to the proportioning coefficient, and then the raw material falls onto the feeding belt of the feeding belt conveyor 3.

The feeding belt conveyor 3 is connected to the twin-screw compression feeder 4 after passing through the intermediate small silo and the small silo conveyor belt. The twin-screw compression feeder is used as a forced feeder, and the feeding belt can be conveyed. The blue charcoal is conveyed between the two grinding rollers of the high static pressure roller press 5 in the way of screw feeding. The twin-screw compression feeder can adjust the feeding amount according to the production requirements by means of frequency conversion control. Through the forced feeder, the lighter and relatively loose blue carbon is pre-compressed, the tightness of the blue carbon before entering the high static pressure roller press is improved, and the material is forced to enter the high static pressure roller press to improve the extrusion effect. .

The twin-screw compression feeder is connected with the upgrading equipment, so that the pre-compressed blue carbon is fed into the upgrading equipment. The modification equipment is a high static pressure roller press 5 . The rolling process of the high static pressure roller press 5 is to extrude the materials through two rollers to cause crushing between the materials, and the extrusion stress between the materials can be adjusted by the pressure of the rollers. The high static pressure roller press 5 implements quasi-static crushing, which saves about 30% of energy consumption compared to the impact crushing method; the high static pressure roller press 5 implements material layer crushing, It is the mutual crushing of materials and materials. Its main function is to refine the particle size of the mixed blue carbon raw material by rolling, to extend the internal cracks of the blue carbon particles and generate new cracks, and at the same time to passivate the microstructure of the blue carbon particles.

There are also four groups of conveyor belts in this system. Each group of conveyor belts is composed of a frame, a conveyor belt, a belt pulley, a tensioning device and a motor. The pulley is driven by the motor to rotate, and the friction between the pulley and the belt depends on the friction force. The power is transmitted to make the belt move, thereby driving the movement of the material on the belt to realize the conveying function. The four groups of conveyor belts are the first conveyor belt 3.1, the second conveyor belt 3.2, the third conveyor belt group 3.3, and the fourth conveyor belt group 3.4. The first conveyor belt is located between the quantitative feeder and the forced feeder. The second conveyor belt is located between the high static pressure roller press and the screening equipment, the third conveyor belt group is located between the screening equipment and the receiving pit, and the fourth conveyor belt group is located between the screening equipment and the finished product storage area. Through the continuous, high-efficiency, and large-angle transportation of the conveyor belt, the material conveying operation can be made safe, simple, easy to maintain, and the freight is low. As a connection device between different equipments, it is distributed between the high static pressure roller press 5 and the screening system; between the screening system and the receiving pit; between the screening system and the finished product storage area. In a preferred way, the finished product storage area has a first finished product storage area and a second finished product storage area, which can be used flexibly and alternately in work.

(4) The blue charcoal modified by the high static pressure roller press is connected to 4 screening equipments through the conveyor belt. In the work, the crushed and bulk materials with different particle sizes are passed through the single-layer or multi-layer screen surface with uniform holes for many times, and are divided into several different levels of process to complete the screening. The particles larger than the sieve hole remain on the sieve surface, which is called the oversize of the sieve surface, and the particles smaller than the sieve hole pass through the sieve hole, which is called the undersize of the sieve surface. Due to the strong vibration of the screen box, the phenomenon of material clogging the screen holes is reduced, so that the screen has high screening efficiency and productivity; the structure is simple, the screen surface is easy to replace; the power consumption per ton of material for screening is small. It is used to control the particle size of the modified blue charcoal. Different sieves can be selected to obtain modified blue charcoal with different particle sizes. Below the screen is the modified blue charcoal that meets the conditions. The blue charcoal above the screen must pass through the conveyor belt. Return to the high static pressure roller press 5 for cyclic operation until it meets the particle size requirements.

(5) The vibrating screen 6 is connected to a discharging device through a conveyor belt. The discharging device includes a discharging trolley. The discharging trolley determines the position of the discharging point in the discharging area. The system also includes a finished product storage area.

The preparation system also includes testing equipment, which includes a drying box, a muffle furnace, an analytical balance, a sulfur analyzer, a calorimeter, a Hastelloy grinder, a sample making machine and a jaw crusher. It is used to detect: moisture, ash, volatile matter, sulfur content, calorific value and Hastelloy grindability index.

The present invention also has a second embodiment of the modified blue charcoal preparation system as shown in Figure 6, which is different from the first embodiment in that a large intermediate silo is used to replace the small silo and the small silo conveyor. The amount of material enters the forced feeder directly from the middle large silo.

The present invention also has a third embodiment of the modified blue carbon preparation system as shown in FIG. 7, which has two finished product storage areas. The unloading equipment includes plow unloader and unloading trolley 7 .

When the plough unloader is not working, the electric push rod is retracted, the plow head is lifted up, the bearing roller is at the same level as other grooved bearing idler rollers, and the movable roller is in a groove angle state. When entering the working state, the electric push rod is extended. On the one hand, the electric push rod drives the pull rod to put down the plowshare, and at the same time pushes the idler frame through the driving arm to make the idler frame rise to the unloading height, and the groove angle of the movable roller disappears. unloading status. After the unloading is completed, it will enter the preparation state. It has the characteristics of absolute self-locking, no internal and external leakage, great overload capacity and stable operation. The plow unloader is used to load the modified blue charcoal in the finished product storage area or put it into the corresponding packaging container.

In this system, as shown in Figure 7, there can be two finished product storage areas. Each finished product storage area is provided with an unloading trolley 7, and the unloading trolley 7 can control the blanking position of the modified blue carbon finished product in the finished product storage area, so as to realize the uniform distribution of the finished product storage area. When a finished product storage area is full, another finished product storage area can be activated to ensure the smooth operation of the blue carbon processing production line and avoid the temporary scheduling of the blue carbon processing production line due to the full load of the finished product storage area. The raw materials are placed in different finished product storage areas to improve the redundancy of the system. The two finished product storage areas can be operated alternately to achieve the purpose of continuous operation of the system, so as to improve efficiency. The plow discharger can be optionally used with either discharge belt.

The preparation system also includes testing equipment, which includes a drying box, a muffle furnace, an analytical balance, a sulfur analyzer, a calorimeter, a Hastelloy grinder, a sample making machine and a jaw crusher. It is used in turn to detect: moisture, ash, volatile matter, sulfur content, calorific value and Hastelloy Grindability Index.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and combine the different embodiments or examples described in this specification, as well as the features of the different embodiments or examples, without conflicting each other.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Embodiments are subject to variations, modifications, substitutions and variations.

Claims (11)

1. The utility model provides a blue charcoal preparation system of upgrading, includes feeder equipment, conveying equipment, screening equipment, discharge apparatus, its characterized in that: also included is a upgrading apparatus that is a hydrostatic crushing apparatus.

2. The modified semi coke preparation system of claim 1, wherein: the static pressure crushing plant is a high static pressure crushing plant.

3. The modified semi-coke preparation system according to claim 2, wherein: the high static pressure crushing equipment is a high static pressure roller press.

4. The modified semi coke preparation system according to any one of claims 1 to 3, wherein: the feeding equipment comprises a receiving pit, a vibrating feeder, a constant feeder and a forced feeder.

5. The modified semi-coke preparation system according to claim 4, wherein: the forced feeder is a prepressing forced feeder.

6. The modified semi-coke preparation system according to claim 5, wherein: the prepressing forced feeding machine is a double-screw compression feeding machine.

7. The modified semi coke preparation system according to any one of claims 1 to 3, wherein: the conveying equipment is provided with a first conveying belt, a second conveying belt, a third group of conveying belts and a fourth group of conveying belts.

8. The modified semi-coke preparation system according to claim 7, wherein: the first conveying belt is located between the constant feeder and the forced feeder, the second conveying belt is located between the high static pressure roller press and the screening device, the third conveying belt group is located between the screening device and the receiving pit, and the fourth conveying belt group is located between the screening device and the finished product storage area.

9. The modified semi coke preparation system according to any one of claims 1 to 3, wherein: the screening apparatus comprises a vibrating screen.

10. The modified semi coke preparation system according to any one of claims 1 to 3, wherein: the discharging equipment comprises a plow discharger and a discharging trolley.

11. The modified semi coke preparation system according to any one of claims 1 to 3, wherein: the system also comprises detection equipment, wherein the detection equipment comprises a drying box, a muffle furnace, an analytical balance, a sulfur determinator, a calorimeter, a Hardgrove grindometer, a sampling machine and a jaw crusher.

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