CN112007743B

CN112007743B - Blue charcoal preparation system of modification

Info

Publication number: CN112007743B
Application number: CN202010840283.6A
Authority: CN
Inventors: 付光临
Original assignee: Fu Guanglin
Current assignee: Fu Guanglin
Priority date: 2020-08-19
Filing date: 2020-08-19
Publication date: 2022-03-29
Anticipated expiration: 2040-08-19
Also published as: CN112007743A

Abstract

The invention relates to a modified semi-coke preparation system which comprises feeding equipment, conveying equipment, screening equipment, discharging equipment, detecting equipment and modifying equipment, wherein the modifying equipment is pressure crushing equipment. The feeding device comprises a vibrating feeder, a constant feeder and a forced feeder, and the forced feeder preferably selects a double-screw compression feeder to provide pre-pressing feeding for the quality-improving device. The pressure crushing plant is preferably a static pressure crusher, in particular a high static pressure roller press. The conveying equipment comprises a conveying belt, the screening equipment comprises a vibrating screen, the discharging equipment preferably selects a plow discharger, and the detecting equipment comprises a drying box, a muffle furnace, an analytical balance, a sulfur determinator, a sampling machine and a jaw crusher. The modified semi-coke prepared by the system can partially or completely replace coal to be used as a blast furnace injection raw material.

Description

Blue charcoal preparation system of modification

Technical Field

The invention belongs to an energy raw material preparation system, and particularly relates to a modified semi-coke preparation system.

Background

Semi coke is a novel carbon material, and becomes an irreplaceable material due to the characteristics of high fixed carbon, high specific resistance, high chemical activity, low ash content, low aluminum, low sulfur and low phosphorus. After the business department of industry and communications in 2014 came out of the coke product admission policy, semi coke is brought into the field of vision of people, is formally brought into clean energy ranks by the nation in 2016, is comprehensively popularized and used in the nation, and is gradually promoted to replace coke (metallurgical coke) to be widely used in industries such as chemical industry, smelting, gas making and the like so as to treat coal combustion pollution.

The using amount of coal in blast furnace injection of iron and steel enterprises is very large, so that the use of semi coke for replacing coal in the injection process has important significance. At present, the semi coke used for replacing coal as a blast furnace injection raw material has a theoretical basis, but still has great difficulty in practical popularization and application, wherein the biggest obstacles are mainly reflected in two aspects:

(1) most importantly, the Hardgrove grindability index of the semi coke is low at present, so that the milling capacity of the medium-speed mill cannot meet the requirement of a blast furnace. The reason for this phenomenon is mainly determined by the structural characteristics of semi-coke, on one hand, the semi-coke has higher hardness than that of bituminous coal, so that the semi-coke is difficult to grind, and on the other hand, the structural form of the semi-coke is denser than that of bituminous coal, as shown in fig. 1(a), the semi-coke has a microstructure without obvious gaps, and as shown in fig. 1(b), the bituminous coal has a microstructure with obvious micro-cavities, so that the strength of the bituminous coal is reduced, and the bituminous coal is easier to break.

The half-tone grindability of the semi-coke is low, which seriously affects the pulverizing efficiency, so that the machine-hour yield of medium-speed grinding is difficult to meet the production requirement, and the proportion of the semi-coke in the pulverized coal for injection cannot be improved, the accompanying drawing 2 shows that the change of the half-tone grindability index in the mixing process of the semi-coke and the bituminous coal does not present a linear relationship, the addition of the semi-coke enables the half-tone grindability index of the mixed pulverized coal to be sharply reduced, and the half-tone grindability index is almost different from the half-tone grindability index of the semi-coke when the mixing proportion reaches 50 percent, so that the half-tone grindability index of the mixed pulverized coal meets the requirement, and the mixing proportion of the semi-coke is low. At present, the mixing proportion of steel enterprises using semi coke for blast furnace injection is generally 10-15%, the highest mixing proportion is not more than 25%, and coal dust is difficult to completely replace, which seriously influences the realization of a coal removal process.

(2) The semi coke has serious abrasion to the conveying equipment, so that the equipment replacement period is shortened, and the production cost is increased. The reason for this phenomenon is several, one is that the semi-coke has a high hardness; secondly, sharp edges and corners exist in the microstructure of the semi-coke, as shown in the attached figure 3; thirdly, the semi-coke particles present obvious lamellar structures which can generate cutting effect during the contact with the blowing equipment. The above conditions all contribute to increased wear of the blowing equipment.

At present, steel enterprises using semi coke as a blast furnace injection raw material do not take effective measures against the problems, and the used process flow is shown in figure 4, so that the production efficiency requirement can be met and the abrasion condition of injection equipment can be relieved only by reducing the use proportion of the semi coke.

Based on the above analysis, there is an urgent need for a modified semi-coke preparation system which can process the existing semi-coke to obtain semi-coke powder with a higher hardgrove grindability index, and the modified semi-coke preparation system is developed by matching with the process requirements of the processing process application filed by the applicant on the same day so as to obtain the semi-coke powder with the higher hardgrove grindability index.

Disclosure of Invention

The invention aims to provide a modified semi-coke preparation system, so that semi-coke powder with a high Ha's grindability index can be efficiently prepared.

The utility model provides a blue charcoal preparation system of upgrading still includes the upgrading equipment in the system including feeder equipment, conveying equipment, screening equipment, unloading equipment and check out test set, the upgrading equipment is static pressure crushing equipment. The static pressure crushing plant is a high static pressure crushing plant. Wherein the high static pressure crushing equipment is a high static pressure roller press. The feeding device comprises a vibrating feeder, a constant feeder and a forced feeder. The forced feeder is a prepressing forced feeder. A double-screw compression feeder is adopted as a prepressing forced feeder. The conveying equipment is a conveying belt, is totally 14, consists of a rack, a conveying belt, a belt roller, a tensioning device and a motor, and is respectively arranged between the constant feeder and the forced feeder; between the high static pressure roller press and the screening system; between the screening system and the receiving pit; between the screening system and the finished product reservoir area. The screening apparatus comprises a vibrating screen. The discharging equipment is a plough type discharger. 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. The modified semi-coke prepared by the system is used for partially or completely replacing coal as a blast furnace injection raw material.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1(a) is a semi-coke microstructure;

FIG. 1(b) is a bituminous coal microstructure;

FIG. 2 is a graph of the effect of semi-coke mixing ratio on the Hardgrove grindability index;

FIG. 3 is a semi-coke outer microstructure;

FIG. 4 is a process flow of the conventional pulverized coal semi-coke mixed injection;

FIG. 5 is a schematic view of an upgraded semi-coke production system of the present invention;

FIG. 6 is a schematic view of a second embodiment of the upgraded semi-coke preparation system of the present invention;

fig. 7 is a schematic view of a third embodiment of the upgraded semi-coke production system of the present invention.

1. A vibrating feeder; 2. a constant feeder; 3. a belt conveyor; 3.1. a first conveyor belt; 3.2. a second conveyor belt; 3.3. a third set of belts; 3.4. a fourth set of conveyor belts; 4. a forced feeder; 5. a high static pressure roller press; 6. vibrating screen; 7. and (4) a discharge trolley.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

As shown in fig. 5, the first embodiment of the modified semi-coke preparation system of the present invention specifically includes: two vibration feeders 1 are used for uniformly, regularly and continuously feeding blocky and granular materials from a storage bin to a receiving device in a production process, and continuously and uniformly feeding crushing machines in a production line. The device has the characteristics of simple structure, uniform feeding, good continuity and adjustable exciting force; the flow can be changed and controlled at any time, and the operation is convenient. The semi-coke feeding device is used for feeding two or more selected semi-coke raw materials, and respectively feeding the semi-coke raw materials according to the proportion set by a program after the mixture ratio of the raw materials is determined. The two vibrating feeders 1 are respectively connected with the two constant feeders 2, the two constant feeders share one feeding belt conveyor 3 for connection, and the constant feeders continuously weigh and feed the bulk materials. It can convey load and speed signal to measurement control instrument or industrial computer, and instrument or industrial computer carry out the internal operation with load and speed signal and calculate actual feeding volume, constantly carry out the comparison with actual feeding volume and settlement feeding volume to control conveyor belt's speed makes feeding volume be close to as far as possible or equal to the feeding volume of settlement. The semi coke raw material falling from the vibrating feeder is subjected to quantitative feeding 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 with the double-screw compression feeder 4 after passing through the middle small bin and the small bin conveying belt, and the double-screw compression feeder is used as a forced feeder, so that the semi-coke conveyed by the feeding belt can be conveyed between the two grinding rollers of the high-static-pressure roller press 5 in a spiral feeding mode. The double-screw compression feeding machine can adjust the feeding amount according to production requirements in a frequency conversion control mode. Through the forced feeder, the semi-coke with lighter weight and relatively loose weight is pre-compressed, the tightness of the semi-coke before entering the high static pressure roller press is improved, and the forced feeder enters the high static pressure roller press, so that the extrusion effect is improved.

The double-screw compression feeder is connected with the upgrading device, so that the pre-compressed semi coke is fed into the upgrading device. The modifying equipment is a high static pressure roller press 5. The rolling process of the high static pressure roller press 5 is that materials are extruded by two rollers to generate a crushing effect between the materials, and the extrusion stress between the materials can be adjusted by the roller pressure. The high static pressure roller press 5 carries out quasi static pressure crushing, and compared with an impact crushing mode, the quasi static pressure crushing mode saves about 30% of energy consumption; the high static pressure roller press 5 crushes the material layer of the material, and the material are mutually crushed. The method has the main effects that the mixed semi-coke raw material is refined in size fraction through rolling, cracks in semi-coke particles extend and generate new cracks, and the microstructure of the semi-coke particles is passivated.

The system is also provided with conveying equipment consisting of four groups of conveying belts, each group of conveying belts consists of a rack, a conveying belt, a belt roller, a tensioning device and a motor, the motor drives the roller to rotate, and power is transmitted between the roller and the belt by virtue of friction force, so that the belt moves, and the materials on the belt are driven to move to realize a conveying function. The four groups of conveying belts are respectively a first conveying belt 3.1, a second conveying belt 3.2, a third conveying belt group 3.3 and a fourth conveying belt group 3.4, the first conveying belt is positioned between the constant feeder and the forced feeder, the second conveying belt is positioned between the high static pressure roller press and the screening device, the third conveying belt group is positioned between the screening device and the receiving pit, and the fourth conveying belt group is positioned between the screening device and the finished product storage area. Through the continuous, high-efficiency and large-inclination-angle transportation of the conveyer belt, the material conveying operation is safe and simple, the maintenance is easy, the transportation cost is low, the transportation distance can be shortened, the construction cost is reduced, and the manpower and the material resources are saved. The device is used as a connecting device between different devices and is respectively 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 reservoir area. The prior mode is that the finished product storage area is provided with a first finished product storage area and a second finished product storage area, and the finished product storage areas can be flexibly and alternately used in work.

(4) The semi coke modified by the high static pressure roller press is connected with 4 screening devices through a conveyer belt, the screening device is a vibrating screen 6 which works by utilizing reciprocating rotary vibration generated by vibrator excitation to divide the crushed material groups with different particle sizes into a plurality of different grades through single-layer or multi-layer screen surfaces with uniformly distributed holes for a plurality of times to complete screening. Particles larger than the screen openings remain on the screen surface, referred to as the oversize of the screen surface, and particles smaller than the screen openings permeate through the screen openings, referred to as the undersize of the screen surface. The sieve box vibrates strongly, so that the phenomenon that the sieve pores are blocked by materials is reduced, and the sieve has higher sieving efficiency and productivity; the structure is simple, and the screen surface is convenient to disassemble and replace; the electric energy consumed by screening each ton of materials is less. The method is used for controlling the grade of the modified semi-coke, the modified semi-coke with different grades can be obtained by selecting different screens, the modified semi-coke meeting the conditions is arranged below the screens, and the semi-coke above the screens is required to return to the high static pressure roller press 5 through a conveyor belt for circulating operation until the semi-coke meets the requirement of the grade.

(5) The vibrating screen 6 is connected with a discharging device through a conveying belt, the discharging device comprises a discharging trolley, the discharging trolley determines the position of a discharging point in a discharging area, and the system further comprises a finished product storage area.

The preparation 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 Haw grindable instrument, a sampling machine and a jaw crusher. It is used for detecting: moisture, ash, volatiles, sulfur content, calorific value, and harderian grindability index.

The present invention also has a second embodiment of the upgraded semi-coke preparation system as shown in fig. 6, which differs from the first embodiment in that a small silo and a small silo conveyor are replaced by a middle large silo, and the weighed materials directly enter the forced feeder from the middle large silo.

The present invention also has a third embodiment of a modified semi-coke preparation system as shown in fig. 7, having two finished product inventory zones. The discharging device comprises a plow discharger and a discharging trolley 7.

When the plow discharger is in a non-working state, the electric push rod retracts, the plowshare lifts, the bearing roller and other groove-shaped bearing roller rollers are in the same level, and the movable roller is in a groove angle state. When the plough enters a working state, the electric push rod extends out, on one hand, the electric push rod drives the pull rod to put down the plough head, and meanwhile, the driving arm pushes the roller carrier to enable the roller carrier to rise to a discharging height, the groove angle of the movable roller disappears, and therefore the plough enters a discharging state. And after the unloading is finished, entering a preparation state. It has the characteristics of absolute self-locking, no internal and external leakage, great overload capacity and stable operation. The plough type discharger is used for loading the modified semi coke in the finished product storage area or placing the modified semi coke into a corresponding packaging container.

In the present system, there may be two product bays, as shown in fig. 7. Each finished product warehouse area is provided with a discharge trolley 7, and the discharge trolley 7 can control the blanking position of the modified semi-coke finished product in the finished product warehouse area to realize the uniform distribution of the finished product warehouse area. When one finished product warehouse area is full, the other finished product warehouse area can be started, the smooth operation of the semi-coke processing production line is ensured, and the temporary setting of the semi-coke processing production line caused by full load of the finished product warehouse area is avoided. The raw materials are placed in different finished product storage areas to improve the redundancy of the system, and the two finished product storage areas can alternately run to achieve the aim of continuous running of the system, thereby improving the efficiency. The plow discharger can select to use any discharging belt.

The preparation 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 Haw grindable instrument, a sampling machine and a jaw crusher. It is used for detection in turn: moisture, ash, volatiles, sulfur content, calorific value, and harderian grindability index.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer 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, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

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: the device also comprises a modification device, wherein the modification device is a static pressure crushing device;

the static pressure crushing equipment is a high static pressure roller press;

the feeding device comprises a receiving pit, a vibrating feeder, a constant feeder and a double-screw compression feeder, wherein the constant feeder is used for dropping the semi-coke material onto the conveying device after the dropping amount of the bulk semi-coke material is determined according to the proportioning coefficient, and the double-screw compression feeder is connected with the conveying device and is used for conveying the semi-coke material into a position between two grinding rollers of the high-static-pressure roller press in a screw feeding mode;

the double-screw compression feeder adjusts the feeding amount through frequency conversion control, and pre-compresses semi-coke with light weight and relatively loose weight;

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;

the first conveying belt is positioned between the constant feeder and the double-screw compression feeder, the second conveying belt is positioned between the high static pressure roller press and the screening equipment, the third conveying belt group is positioned between the screening equipment and the receiving pit, and the fourth conveying belt group is positioned between the screening equipment and the finished product storage area;

the screening device comprises a vibrating screen;

the discharging equipment comprises a plow discharger and a discharging trolley;

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.