A dual-system raw coal storage, transportation and processing system and process thereof

Abstract

The present invention belongs to the field of coal coke storage and transportation for large-scale medium and low temperature coal pyrolysis, and in particular, relates to a dual-system raw coal storage and transportation processing system and its process. The system includes a car unloading system, a raw coal processing system, a raw coal storage and transportation system, and a raw coal external transportation loading system. The car unloading system includes a main system and a secondary system. The main system is connected to the raw coal processing system through a second belt conveyor, and the secondary system is connected to the raw coal storage and transportation system through a fourth belt conveyor; the raw coal storage and transportation system is connected to the raw coal transportation and processing system through a second belt conveyor; the raw coal transportation and processing system includes a first vibrating screen, a double-toothed roller crusher, and a second vibrating screen, and the crushed and screened pulverized coal is transported to different furnace groups and the raw coal external transportation loading system through a fifth belt, a sixth belt, a seventh belt, and an eighth belt. The present invention realizes the combination of direct processing and use of incoming coal and storage and use in the coal yard by setting up a main and secondary dual system, and maximizes the stable and continuous feeding of the subsequent pyrolysis section.

Description

Technical Field

[0001] The invention belongs to the field of storage and transportation of coal coke in large-scale medium- and low-temperature coal pyrolysis, and in particular relates to a dual-system raw coal storage, transportation and processing system and a process thereof. Background Art

[0002] my country is rich in low-rank coal resources such as lignite, long flame coal, weakly sticky coal, and non-sticky coal, accounting for 55% of the country's coal production and more than 80% of the coal production in Shaanxi, Inner Mongolia, and Xinjiang. Low-rank coal can be converted into different grades and qualities through medium and low temperature pyrolysis to obtain three energy products: coal gas, coal tar, and semi-coke. At present, my country's total semi-coke production capacity is about 100 million tons / year, and the pyrolysis process mainly uses an internal heating vertical furnace.

[0003] The raw coal storage and transportation device is the feeding and supply system of the internal heating vertical furnace group, which is crucial to maintaining the stable production of the furnace group. At present, the vertical furnace group mostly adopts a single coal loading system, that is, the raw coal is transported from the outside of the site to the site by car, and is directly unloaded to a single or multiple coal receiving pits, and then sent to the screening room for screening by the belt conveyor under the coal pit. The qualified coal for entering the furnace is screened and sent to the vertical furnace group. Generally, this process is simple, with less equipment, compact layout, and convenient operation. Small and medium-sized semi-coke plants at home and abroad basically adopt this coal loading process. However, with the increase in the number of furnace groups, from a single furnace group to a double furnace group or even four furnace groups, and with the increase in the production capacity of a single furnace, the scale of a single furnace group is also getting larger and larger. The amount of raw coal required for the overall furnace group has increased from millions of tons per year to nearly 10 million tons. The previous simple coal loading process cannot guarantee uniform and stable feeding of multiple furnace groups. At the same time, the large amount of raw coal storage and use in the field cannot be solved by the original process. Summary of the invention

[0004] The purpose of the present invention is to provide a dual-system raw coal storage, transportation and processing system and its process to solve the defects of the above-mentioned existing coal loading process that cannot ensure uniform and stable feeding to multiple furnace groups and the large amount of raw coal stored on site and inconvenient to use.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A dual-system raw coal storage, transportation and processing system comprises a truck coal unloading system, a raw coal processing system and a raw coal storage and transportation system, wherein the truck coal unloading system consists of a main system and a sub-system, the main system comprises a coal unloading chute for accommodating raw coal, an impeller coal feeder is provided at the outlet of the coal unloading chute, and the impeller coal feeder is connected to the raw coal processing system via a first belt conveyor and a second belt conveyor in sequence; the sub-system comprises a coal unloading pit, a first electro-hydraulic gate valve is provided at the outlet of the coal unloading pit, the first electro-hydraulic gate valve is connected to a first vibrating feeder, and the first vibrating feeder is connected to the raw coal storage and transportation system via a third belt conveyor and a fourth belt conveyor in sequence.

[0007] Furthermore, the raw coal storage and transportation system includes a bucket wheel stacker and reclaimer, a strip yard is provided below the bucket wheel stacker and reclaimer, and the strip yard is connected to the raw coal transportation and processing system via a second belt conveyor.

[0008] Furthermore, the raw coal transportation and processing system includes a first vibrating screen, a crushing buffer bin, a second vibrating screen and an intermediate buffer bin. The crushing buffer bin feeds the second vibrating screen through a third electro-hydraulic gate valve and a third vibrating feeder. The second vibrating screen is connected to the intermediate buffer bin via a fifth belt conveyor and a sixth belt conveyor; the intermediate buffer bin has a double outlet, each outlet is provided with a fourth electro-hydraulic gate valve, and each outlet of the fourth electro-hydraulic gate valve is connected to a fourth vibrating feeder, one of the fourth vibrating feeders is connected to the seventh belt conveyor, and the other fourth vibrating feeder is connected to the eighth belt conveyor.

[0009] Furthermore, the raw coal conveying and processing system also includes a pre-screen buffer bin, which feeds the first vibrating screen through a second electro-hydraulic gate valve and a second vibrating feeder.

[0010] Furthermore, a double-toothed roller crusher is provided between the first vibrating screen and the crushing buffer bin, and unqualified raw coal screened by the first vibrating screen is crushed by the double-toothed roller crusher and then enters the crushing buffer bin.

[0011] Furthermore, a dual-system raw coal storage, transportation and processing system also includes a raw coal export transportation and loading system, which includes an electro-hydraulic three-way distributor and a pulverized coal silo, wherein the electro-hydraulic three-way distributor is connected to the pulverized coal silo via a tenth belt conveyor, and an electro-hydraulic jaw gate is provided at the outlet of the pulverized coal silo.

[0012] Furthermore, the coal unloading chute is a trough-shaped seam-type coal unloading bunker, and the coal unloading pit is a pyramid-shaped coal unloading bunker.

[0013] A dual-system raw coal storage and transportation processing technology includes the following steps:

[0014] S1, coal from trucks is unloaded into the coal unloading chute, and then falls onto the first belt conveyor through the impeller coal feeder under the coal unloading chute, and then falls onto the second belt conveyor;

[0015] S2, coal from trucks is unloaded into the coal unloading pit, and the raw coal falls onto the third belt conveyor through the electro-hydraulic gate valve and vibrating feeder under the coal unloading pit;

[0016] S3, the raw coal on the third belt conveyor is transferred to the strip yard via the fourth belt conveyor, and the raw coal in the strip yard is evenly and continuously transferred to the second belt conveyor to realize the standby function of storage and retrieval of the auxiliary system;

[0017] S4, the raw coal from the second belt conveyor enters the pre-screen buffer bin, and after buffering, is fed to the first vibrating screen through the second electro-hydraulic gate valve and the second vibrating feeder;

[0018] S5. The two kinds of mixed coal are screened once. The qualified raw coal directly enters the crushing buffer bin, and the unqualified raw coal enters the double-toothed roller crusher and enters the crushing buffer bin after being crushed;

[0019] S6. The raw coal in the crushing buffer bin is fed to the second vibrating screen through the third electro-hydraulic gate valve and the third vibrating feeder. After secondary screening, the qualified pulverized coal is sent to the intermediate buffer bin through the fifth belt conveyor and the sixth belt conveyor, and the unqualified pulverized coal is sent to the raw coal transport loading system;

[0020] S7. The pulverized coal in the intermediate buffer bin is fed to the seventh belt conveyor and the eighth belt conveyor through the fourth electro-hydraulic gate valve and the fourth vibrating feeder, and then sent to different furnace groups in two ways.

[0021] Furthermore, the unqualified raw coal in step S5 is pulverized coal with a particle size greater than 80 mm, and the qualified raw coal is pulverized coal with a particle size less than or equal to 80 mm.

[0022] Furthermore, the qualified pulverized coal in step S6 is pulverized coal with a particle size of 10-80 mm, and the unqualified pulverized coal is pulverized coal with a particle size of less than 10 mm.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) The present invention sets up a main and auxiliary dual system, wherein a portion of the coal from the truck is directly unloaded into the main system, and the other portion is unloaded into the auxiliary system. The raw coal from the auxiliary system is transported to the raw coal storage and transportation system via the third belt conveyor and the fourth belt conveyor, thereby realizing the combination of direct processing and use of the incoming coal and storage and retrieval of the incoming coal in the coal yard, thereby ensuring stable and continuous feeding of the subsequent pyrolysis section to the greatest extent.

[0025] (2) The main and auxiliary systems of the present invention share a raw coal transportation and processing system. The raw coal stored in the auxiliary system is taken and incorporated into the raw coal processing system of the main system, which simplifies the process, reduces investment, and ensures the stability of coal used by the raw coal processing system.

[0026] (3) The bucket wheel stacker and reclaimer used in the raw coal storage and transportation system can also realize zoned and classified stacking, providing the possibility for different furnace groups to receive different types of coal. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a dual-system raw coal storage, transportation and processing device provided by the present invention;

[0028] Figure 2 A flow chart of a dual-system raw coal storage and transportation processing process provided by the present invention;

[0029] Among them, 1- coal unloading chute, 2- impeller coal feeder, 3- first belt conveyor, 4- coal unloading pit, 5- first electro-hydraulic gate valve, 6- first vibrating feeder, 7- third belt conveyor, 8- fourth belt conveyor, 9- bucket wheel stacker and reclaimer, 10- strip yard, 11- second belt conveyor, 12- pre-screen buffer bin, 13- second electro-hydraulic gate valve, 14- second vibrating feeder, 15- first vibrating screen, 16- double-toothed roller crusher, 17- crushing buffer bin, 18- third electro-hydraulic gate valve, 1 9-the third vibrating feeder, 20-the second vibrating screen, 21-the fifth belt conveyor, 22-the sixth belt conveyor, 23-the intermediate buffer bin, 24-the fourth electro-hydraulic gate valve, 25-the fourth vibrating feeder, 26-the seventh belt conveyor, 27-the eighth belt conveyor, 28-the electro-hydraulic three-way distributor, 29-the ninth belt conveyor, 30-the tenth belt conveyor, 31-the pulverized coal silo, 32-the electro-hydraulic jaw gate, A-furnace group No. 1, B-furnace group No. 2, C-subsequent processes, D-external transportation and loading. DETAILED DESCRIPTION

[0030] To make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail with reference to the accompanying drawings. The "first" and "second" mentioned in the text do not refer to the order, but to distinguish similar structures.

[0031] Example 1

[0032] See also Figure 1 , Figure 2 A dual-system raw coal storage, transportation and processing system includes a truck unloading system, a raw coal processing system and a raw coal storage and transportation system, wherein the truck unloading system is composed of a main system and a secondary system, the main system includes a coal unloading chute 1 for accommodating raw coal, an impeller coal feeder 2 is provided at the outlet of the coal unloading chute 1, and the impeller coal feeder 2 is connected to the raw coal processing system via a first belt conveyor 3 and a second belt conveyor 11 in sequence; the secondary system includes a coal unloading pit 4, a first electro-hydraulic gate valve 5 is provided at the outlet of the coal unloading pit 4, the first electro-hydraulic gate valve 5 is connected to a first vibrating feeder 6, and the first vibrating feeder 6 is connected to the raw coal storage and transportation system via a third belt conveyor 7 and a fourth belt conveyor 8 in sequence. As a preferred embodiment, the coal unloading chute 1 is a slot-shaped seam coal unloading bin, and the coal unloading pit 4 is a pyramidal coal unloading bin.

[0033] The raw coal storage and transportation system includes a bucket wheel stacker and reclaimer 9, and a strip yard 10 is provided below the bucket wheel stacker and reclaimer 9. The strip yard 10 is connected to the raw coal transportation and processing system via a second belt conveyor 11. The raw coal storage and transportation system uses two bucket wheel stackers and reclaimers 9 to retrieve materials, which are used as backup for each other. They stack coal in the yard and retrieve coal at the same time, completing the stacking and retrieving work in the large strip coal yard. In addition, raw coal of different types is stacked in different areas in the strip yard, and different pulverized coal can be transported to different furnace groups.

[0034] The raw coal conveying and processing system comprises a first vibrating screen 15, a crushing buffer bin 17, a second vibrating screen 20 and an intermediate buffer bin 23. After the raw coal transported from the raw coal storage and transportation system and the automobile coal unloading system is screened by the first vibrating screen 15, the qualified raw coal directly enters the crushing buffer bin 17 for buffering, and is fed to the second vibrating screen 20 through a third electro-hydraulic gate valve 18 and a third vibrating feeder 19; the qualified coal for entering the furnace after screening by the second vibrating screen 20 is transported to the intermediate buffer bin 23 through a fifth belt conveyor 21 and a sixth belt conveyor 22; the intermediate buffer bin 23 has a double outlet, each outlet is provided with a fourth electro-hydraulic gate valve 24, and each outlet of the fourth electro-hydraulic gate valve 24 is connected to a fourth vibrating feeder 25, one of the fourth vibrating feeders 25 transports the finished coal to A through a seventh belt conveyor 26, and the other fourth vibrating feeder 25 transports the finished coal to B through an eighth belt conveyor 27.

[0035] In addition, the raw coal transportation and processing system adopts a dual-route layout, with one route in operation and one route in standby.

[0036] Example 2

[0037] On the basis of Example 1, the raw coal conveying and processing system also includes a pre-screen buffer bin 12, and a second electro-hydraulic gate valve 13 is provided at the outlet of the pre-screen buffer bin 12. The second electro-hydraulic gate valve 13 is connected to a second vibrating feeder 14 through a chute, and the vibrating feeder 14 feeds to the first vibrating screen 15.

[0038] Example 3

[0039] On the basis of Example 1, a double-toothed roller crusher 16 is further arranged between the first vibrating screen 15 and the crushing buffer bin 17. The unqualified raw coal screened by the first vibrating screen 15 is crushed by the double-toothed roller crusher 16 and then enters the crushing buffer bin 17. The double-toothed crushing roller 16 has two sets of independent driving devices, and the two crushing rollers can work independently. During crushing, the working system can be changed according to the amount of raw coal, that is, a single machine is used when the amount of raw coal is small, and a double machine is used when the amount of raw coal is large, so that both large-scale raw coal and small-scale raw coal can be crushed. In addition, when a certain crushing roller fails, it does not affect the crushing of unqualified raw coal.

[0040] Example 4

[0041] On the basis of Example 1, a dual-system raw coal storage, transportation and processing device also includes a raw coal transport and loading system for receiving unqualified coal (pulverized coal) after screening by the second vibrating screen 20, and the raw coal transport and loading system includes an electro-hydraulic three-way distributor 28, and the outlet of the electro-hydraulic three-way distributor 28 is connected to a ninth belt conveyor 29 and a tenth belt conveyor 30, and the outlet of the tenth belt conveyor 30 is connected to a pulverized coal silo 31, and the outlet of the pulverized coal silo 31 is provided with an electro-hydraulic jaw gate 32. Preferably, a plurality of pulverized coal silos 31 are arranged in parallel, and 4 discharge ports are arranged under each pulverized coal silo 31, and the electro-hydraulic jaw gate 32 is used for discharge and loading, and two silos are arranged in a group, and a ground scale is arranged under each group of silos, corresponding to loading a transport vehicle.

[0042] Example 5

[0043] A dual-system raw coal storage and transportation processing technology includes the following steps:

[0044] S1. The coal from trucks is unloaded into the coal unloading chute by self-unloading or mechanical unloading. The raw coal falls onto the first belt conveyor through the impeller coal feeder under the coal unloading chute, and then falls onto the second belt conveyor;

[0045] S2, coal from trucks is unloaded into the coal unloading pit, and the raw coal falls onto the third belt conveyor through the electro-hydraulic gate valve and vibrating feeder under the coal unloading pit;

[0046] S3, the raw coal on the third belt conveyor is transferred to the strip yard via the fourth belt conveyor, and the raw coal in the strip yard is evenly and continuously transferred to the second belt conveyor to realize the standby function of storage and retrieval of the auxiliary system;

[0047] S4, the raw coal from the second belt conveyor enters the pre-screen buffer bin, and after buffering, is fed to the first vibrating screen through the second electro-hydraulic gate valve and the second vibrating feeder;

[0048] S5. After the first screening, the unqualified raw coal with a size of >80 mm enters the double-toothed roller crusher and enters the crushing buffer bin after being crushed, while the qualified raw coal with a size of ≤80 mm is directly mixed into the crushing buffer bin;

[0049] S6. The raw coal in the crushing buffer bin is fed to the second vibrating screen through the third electro-hydraulic gate valve and the third vibrating feeder. After secondary screening, the 10-80mm screen-surface material is qualified coal for furnace entry and is sent to the intermediate buffer bin through the fifth belt conveyor. The unqualified pulverized coal under the screen <10mm is sent to the subsequent device or the raw coal transport loading system.

[0050] S7. The pulverized coal in the intermediate buffer bin is fed to the seventh belt conveyor and the eighth belt conveyor through the fourth electro-hydraulic gate valve and the fourth vibrating feeder, and then sent to different furnace groups in two ways.

[0051] Example 6

[0052] Based on Example 5, the specific steps of sending the small-size pulverized coal to the raw coal transport loading system in step S6 are as follows:

[0053] S61, the unqualified pulverized coal screened by the second vibrating screen is sent to the electric hydraulic three-way distributor through the tenth belt conveyor;

[0054] S62, a part of the pulverized coal separated by the electro-hydraulic three-way distributor is sent to the subsequent process section C via the ninth belt conveyor, and the other part is sent to the pulverized coal silo via the tenth belt conveyor;

[0055] S63. After being filtered in the pulverized coal silo, the pulverized coal is discharged through an electro-hydraulic jaw gate for external transportation and loading onto trucks D.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A dual-system raw coal storage, transportation and processing system, characterized in that: The invention comprises a truck coal unloading system, a raw coal conveying and processing system and a raw coal storage and transportation system, wherein the truck coal unloading system is composed of a main system and a sub-system, the main system comprises a coal unloading chute (1) for accommodating raw coal, an impeller coal feeder (2) is arranged at the outlet of the coal unloading chute (1), and the impeller coal feeder (2) is connected to the raw coal conveying and processing system via a first belt conveyor (3) and a second belt conveyor (11) in sequence; the sub-system comprises a coal unloading pit (4), a first electro-hydraulic gate valve (5) is arranged at the outlet of the coal unloading pit (4), the first electro-hydraulic gate valve (5) is connected to a first vibrating feeder (6), and the first vibrating feeder (6) is connected to the raw coal storage and transportation system via a third belt conveyor (7) and a fourth belt conveyor (8) in sequence; The raw coal storage and transportation system comprises a bucket wheel stacker (9), a strip yard (10) is provided below the bucket wheel stacker (9), and the strip yard (10) is connected to the raw coal transportation and processing system via a second belt conveyor (11); The raw coal conveying and processing system comprises a first vibrating screen (15), a crushing buffer bin (17), a second vibrating screen (20) and an intermediate buffer bin (23); the crushing buffer bin (17) feeds the second vibrating screen (20) via a third electro-hydraulic gate valve (18) and a third vibrating feeder (19); the second vibrating screen (20) is connected to the intermediate buffer bin (23) via a fifth belt conveyor (21) and a sixth belt conveyor (22); the intermediate buffer bin (23) has two outlets, each outlet is provided with a fourth electro-hydraulic gate valve (24); each outlet of the fourth electro-hydraulic gate valve (24) is connected to a fourth vibrating feeder (25); one of the fourth vibrating feeders (25) is connected to a seventh belt conveyor (26), and the other of the fourth vibrating feeders (25) is connected to an eighth belt conveyor (27).

2. A dual-system raw coal storage, transportation and processing system according to claim 1, characterized in that: The raw coal conveying and processing system further comprises a pre-screen buffer bin (12), and the pre-screen buffer bin (12) feeds materials to the first vibrating screen (15) through a second electro-hydraulic gate valve (13) and a second vibrating feeder (14).

3. A dual-system raw coal storage, transportation and processing system according to claim 1, characterized in that: A double-toothed roller crusher (16) is also provided between the first vibrating screen (15) and the crushing buffer bin (17); unqualified raw coal screened by the first vibrating screen (15) is crushed by the double-toothed roller crusher (16) and then enters the crushing buffer bin (17).

4. A dual-system raw coal storage, transportation and processing system according to claim 1, characterized in that: The invention also comprises a raw coal transport and loading system, the raw coal transport and loading system comprising an electro-hydraulic three-way distributor (28) and a pulverized coal silo (31), the electro-hydraulic three-way distributor (28) being connected to the pulverized coal silo (31) via a tenth belt conveyor (30), and an electro-hydraulic jaw gate (32) being provided at the outlet of the pulverized coal silo (31).

5. A dual-system raw coal storage, transportation and processing system according to any one of claims 1 to 4, characterized in that: The coal unloading chute (1) is a trough-shaped seam-type coal unloading bin, and the coal unloading pit (4) is a pyramid-shaped coal unloading bin.

6. A dual-system raw coal storage, transportation and processing technology, characterized in that: The steps include: S1, coal from trucks is unloaded into the coal unloading chute, and then falls onto the first belt conveyor through the impeller coal feeder under the coal unloading chute, and then falls onto the second belt conveyor; S2, coal from trucks is unloaded into the coal unloading pit, and the raw coal falls onto the third belt conveyor through the electro-hydraulic gate valve and vibrating feeder under the coal unloading pit; S3, the raw coal on the third belt conveyor is transferred to the strip yard via the fourth belt conveyor, and the raw coal in the strip yard is evenly and continuously transferred to the second belt conveyor to realize the standby function of storage and retrieval of the auxiliary system; S4, the raw coal from the second belt conveyor enters the pre-screen buffer bin, and after buffering, is fed to the first vibrating screen through the second electro-hydraulic gate valve and the second vibrating feeder; S5. The two kinds of mixed coal are screened once. The qualified raw coal directly enters the crushing buffer bin, and the unqualified raw coal enters the double-toothed roller crusher and enters the crushing buffer bin after being crushed; S6. The raw coal in the crushing buffer bin is fed to the second vibrating screen through the third electro-hydraulic gate valve and the third vibrating feeder. After secondary screening, the qualified pulverized coal is sent to the intermediate buffer bin through the fifth belt conveyor and the sixth belt conveyor, and the unqualified pulverized coal is sent to the raw coal transport loading system; S7. The pulverized coal in the intermediate buffer bin is fed to the seventh belt conveyor and the eighth belt conveyor through the fourth electro-hydraulic gate valve and the fourth vibrating feeder, and then sent to different furnace groups in two ways.

7. A dual-system raw coal storage, transportation and processing process according to claim 6, characterized in that: The unqualified raw coal in step S5 is pulverized coal with a particle size greater than 80 mm, and the qualified raw coal is pulverized coal with a particle size less than or equal to 80 mm.

8. The dual-system raw coal storage, transportation and processing technology according to claim 6 is characterized in that: The qualified pulverized coal in step S6 is pulverized coal with a particle size of 10-80 mm, and the unqualified pulverized coal is pulverized coal with a particle size of less than 10 mm.

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