Heavy-load step-by-step direct-acting pneumatic conveying system for coarse slag

Abstract

The invention relates to the field of fly ash conveying equipment, in particular to a coarse slag heavy-load step-by-step direct-acting pneumatic conveying system which comprises a feeding system, a crushing system, a temporary storage system, a bin pump, a pneumatic slag conveying system and a tail end slag bin which are communicated with one another through pipelines. The feeding system comprises an original slag bin, a discharging valve is arranged in the original slag bin and communicated with a feeding device, the position, away from the discharging valve, of the feeding device is communicated with the crushing device, and the position, away from the discharging valve, of the crushing device is communicated with the temporary storage system. The temporary storage system comprises a temporary storage slag bin, the temporary storage slag bin is provided with a manual feeding valve, the manual feeding valve controls opening and closing of the temporary storage slag bin, the temporary storage slag bin is communicated with a bin pump, friction and collision of coarse and heavy materials in the conveying process are reduced through the step-by-step direct-acting conveying units arranged along the main pipeline, the conveying efficiency is improved, and the conveying cost is reduced. And the effect of improving the use flexibility of the slag conveying system is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of coarse slag conveying equipment, and in particular to a coarse slag heavy-load step-by-step direct-acting pneumatic conveying system. Background Art

[0002] Pneumatic conveying system, also known as air flow conveying system. It is usually divided into two modes: positive pressure conveying and negative pressure conveying. Positive pressure conveying is to input compressed air into the starting conveying pipeline, and use the pressure difference between the starting point and the end point of the pipeline to make the mixture of air and conveyed materials flow at a certain speed in the pipeline. It has the advantages of closed conveying process, high efficiency and energy saving, and flexible layout, and is widely used in material transportation and conveying industries.

[0003] At present, the treatment of coarse and heavy particulate materials such as slag is mostly handled by "dry slag discharger transportation + mechanical slag crushing" and then temporarily stored in the intermediate slag bin, and then transported to the ash storage at the end of the plant by vehicle. The transportation process causes serious environmental pollution in the plant area and consumes a lot of manpower and material resources. On the other hand, positive pressure pneumatic slag conveying systems are gradually emerging in the field of coarse and heavy material transportation, and related engineering research and development and application have been continuously promoted. As a relatively new transportation engineering application, the current research on positive pressure pneumatic slag conveying is mostly in the form of positive pressure double-tube pneumatic conveying. Due to the frequent changes in coal types and loads in coal-fired power plants, the system has poor adaptability, severe pipe wear during transportation, high energy consumption during transportation, and is prone to blockage. In addition, the system often lacks flexibility and adjustability, and it is difficult to adapt to the requirements of different material characteristics and transportation environments. Summary of the invention

[0004] The object of the present invention is to provide a coarse slag heavy-load step-by-step direct-acting pneumatic conveying system to achieve the effect of improving the use flexibility of the slag conveying system and to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] The coarse slag heavy-load step-by-step direct-acting pneumatic conveying system includes a feeding system, a crushing system, a buffer system, a bin pump, a pneumatic slag conveying system and a terminal slag bin. Each system is interconnected by pipelines.

[0007] The feeding system includes an original slag bin, in which a discharge valve is provided, the discharge valve is connected to a feeding device, a position of the feeding device away from the discharge valve is connected to a crushing device, and a position of the crushing device away from the discharge valve is connected to a buffer system;

[0008] The cache system includes a cache slag bin, which is provided with a manual feed valve, which controls the opening and closing of the cache slag bin, and the cache slag bin is connected to a bin pump;

[0009] The silo pump includes a silo pump with a pneumatic feed valve, the buffer slag silo is first connected to the pneumatic feed valve and then to the silo pump, and the silo pump is connected to the terminal slag silo;

[0010] The pneumatic slag conveying system includes an air storage tank, which is provided with an air source control valve. The air storage tank is connected to the main air intake assembly through the air source control valve. The main air intake assembly is connected to the silo pump air intake valve. The silo pump air intake valve is connected to the silo pump. The silo pump air intake valve controls the gas inside the air storage tank to enter the silo pump. A plurality of distributed direct-acting conveying units are arranged between the silo pump and the terminal slag silo, and the plurality of distributed direct-acting conveying units are connected in sequence.

[0011] As a preferred embodiment of the present invention, a backup system is arranged between the cache system and the terminal slag bin, the backup system includes a backup bin pump, the cache slag bin is connected with the backup bin pump, the cache slag bin is connected with the backup bin pump and the bin pump respectively through a balancing valve, and the backup bin pump adopts multiple distributed direct-acting conveying units to be separately connected with the terminal slag bin.

[0012] As a preferred embodiment of the present invention, the silo pump and the spare silo pump are both provided with a material level meter, and a discharge valve is provided at the bottom end of the silo pump.

[0013] As a preferred embodiment of the present invention, the pneumatic slag conveying system is provided with a gas accompanying system, the gas accompanying system includes an instrument compressed air unit, the instrument compressed air unit provides airflow for the gas accompanying system, the instrument compressed air unit is connected to a gas accompanying component, and the gas accompanying component is respectively connected to each distributed direct-acting conveying unit.

[0014] As a preferred embodiment of the present invention, the pneumatic slag conveying system and the accompanying gas system are respectively provided with pressure detectors.

[0015] As a preferred embodiment of the present invention, the pneumatic slag conveying system and the accompanying gas system are commonly connected to a solenoid valve box, and the solenoid valve box is electrically connected to a pressure detector.

[0016] As a preferred embodiment of the present invention, the main air intake assembly includes a manual shut-off valve, one side of the manual shut-off valve is connected to the air storage tank, and the other side is connected to a filter, the filter is connected to a pressure regulating valve at a position away from the manual shut-off valve, the pressure regulating valve is connected to a pneumatic shut-off valve, the pneumatic shut-off valve is connected to a check valve, and the check valve is connected to a distributed direct-acting conveying unit.

[0017] As a preferred embodiment of the present invention, the accompanying gas component includes an accompanying gas manual shut-off valve, one side of the accompanying gas manual shut-off valve is connected to the instrument compressed air unit, and the other side is connected to an accompanying gas filter, one end of the accompanying gas filter is provided with an accompanying gas pressure regulating valve, the position of the accompanying gas filter away from the accompanying gas manual shut-off valve is connected to the accompanying gas pneumatic shut-off valve, the accompanying gas pneumatic shut-off valve is connected to the accompanying gas check valve, and the accompanying gas check valve is connected to the distributed direct-acting conveying unit.

[0018] As a preferred embodiment of the present invention, a screening device is provided between the crushing device and the buffer slag bin, the screening device is independently connected to a lifting device, the bottom of the lifting device is connected to the screening device, and the top is connected to the original slag bin.

[0019] Beneficial Effects

[0020] The beneficial effects of the present invention are:

[0021] The crushing system is installed below the outlet of the original slag bin. The materials processed by the crushing system first enter the buffer system, and then enter the bin pump for temporary storage, and then the pneumatic slag conveying system is started under the orderly control of the system. When the slag conveying is started, the control system first starts the instrument air compressor and the slag conveying air compressor, opens the main air intake component and the accompanying air component, closes the feed valve at the upper end of the bin pump, starts the bin pump fluidization, opens the bin pump discharge valve, starts pneumatic slag conveying in the main pipeline, and transports the slag-gas mixture to the end of the pipeline, and finally transports it to the terminal slag bin. Through the step-by-step direct-acting conveying unit arranged along the main pipeline, the friction and collision of coarse and heavy materials during the conveying process are reduced, the conveying efficiency is improved, and the flexibility of the slag conveying system is improved. It can realize the efficient, stable and reliable conveying of coarse slag and heavy-loaded materials, improve the conveying efficiency, reduce energy consumption, and promote the technological progress and green development of related industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0023] Figure 1 This is a schematic diagram of a coarse slag heavy-load step-by-step direct-acting pneumatic conveying system;

[0024] Figure 2 Schematic diagram of the main air intake assembly;

[0025] Figure 3 This is a schematic diagram of the gas-bearing assembly;

[0026] Figure 4 This is the operating program logic diagram of the step-by-step direct-acting conveying unit.

[0027] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0028] 1. Original slag bin; 2. Discharge valve; 3. Feeding device; 4. Crushing device; 5. Screening device; 6. Buffer slag bin; 7. Lifting device; 8. Balance valve; 9. Manual feed valve; 10. Pneumatic feed valve; 11. Bin pump; 12. Level meter; 13. Bin pump air intake valve; 14. Unloading valve; 17. Distributed direct-acting conveying unit; 19. Pressure detector; 20. Main air intake assembly; 2001. Manual shut-off valve; 200 2. Filter; 2003. Pressure regulating valve; 2004. Pneumatic shut-off valve; 2005. Check valve; 22. Air storage tank; 24. Spare bin pump; 25. Solenoid valve box; 26. Compressed air unit for instrument; 27. Accompanying air component; 2701. Accompanying air manual shut-off valve; 2702. Accompanying air filter; 2703. Accompanying air pressure regulating valve; 2704. Accompanying air pneumatic shut-off valve; 2705. Accompanying air check valve; 28. Terminal slag bin. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-4 As shown, the coarse slag heavy-load step-by-step direct-acting pneumatic conveying system includes a feeding system, a crushing system, a buffer system, a bin pump 11, a pneumatic slag conveying system backup system and a terminal slag bin 28. The various systems are interconnected by pipelines. The crushing system is used to reduce the particle size of the coarse slag, thereby reducing the wear in the pipeline. The set backup system can be replaced and utilized in time, thereby improving the flexibility of equipment use and achieving the effect of improving the flexibility of the slag conveying system.

[0031] The feeding system comprises an original slag bin 1, in which a discharge valve 2 is arranged, the discharge valve 2 is connected to a feeding device 3, the feeding device 3 is connected to a crushing device 4 at a position away from the discharge valve 2, and the crushing device 4 is connected to a buffer system at a position away from the discharge valve 2;

[0032] The cache system includes a cache slag bin 6, which is provided with a manual feed valve 9, which controls the opening and closing of the cache slag bin 6, and the cache slag bin 6 is connected to a bin pump 11; a screening device 5 is provided between the crushing device 4 and the cache slag bin 6, and the screening device 5 is separately connected to a lifting device 7, and the bottom of the lifting device 7 is connected to the screening device 5, and the top is connected to the original slag bin 1. By providing the lifting device 7, the coarse slag with larger particle size screened out can be put back into the original slag bin 1, thereby improving the accuracy of crushing.

[0033] The bin pump 11 includes a bin pump 11 with a pneumatic feed valve 10, the buffer slag bin 6 is first connected to the pneumatic feed valve 10 and then connected to the bin pump 11, and the bin pump 11 is connected to the terminal slag bin 28;

[0034] The pneumatic slag conveying system includes an air storage tank 22, which is provided with an air source control valve. The air storage tank 22 is connected to the main air intake assembly 20 through the air source control valve. The main air intake assembly 20 includes a manual shut-off valve 2001, one side of the manual shut-off valve 2001 is connected to the air storage tank 22, and the other side is connected to a filter 2002. The filter 2002 is connected to a pressure regulating valve 2003 at a position away from the manual shut-off valve 2001. The pressure regulating valve 2003 is connected to a pneumatic shut-off valve 2004. The pneumatic shut-off valve 2004 is connected to a check valve 2005. The check valve 2005 is connected to the distributed direct-acting conveying unit 17. At the same time, the check valve 2005 is connected to the silo pump air inlet valve 13, and the silo pump air inlet valve 13 is connected to the silo pump 11. The silo pump air inlet valve 13 controls the gas inside the gas storage tank 22 to enter the silo pump 11. A plurality of distributed direct-acting conveying units 17 are arranged between the silo pump 11 and the terminal slag silo 28, and the plurality of distributed direct-acting conveying units 17 are connected in sequence.

[0035] The backup system includes a backup bin pump 24, the buffer slag bin 6 is connected to the backup bin pump 24, the buffer slag bin 6 is connected to the backup bin pump 24 and the bin pump 11 respectively through a balance valve 8, and the backup bin pump 24 is connected to the terminal slag bin 28 separately using multiple distributed direct-acting conveying units 17. Both the bin pump 11 and the backup bin pump 24 are provided with a material level meter 12, and the bottom of the bin pump 11 is provided with a discharge valve 14.

[0036] The pneumatic slag conveying system is provided with a gas system, which includes an instrument compressed air unit 26. The instrument compressed air unit 26 provides airflow for the gas system. The instrument compressed air unit 26 is connected to a gas assembly 27. The gas assembly 27 includes a manual gas shut-off valve 2701. One side of the manual gas shut-off valve 2701 is connected to the instrument compressed air unit 26, and the other side is connected to a gas filter 2702. One end of the gas filter 2702 is provided with a gas pressure regulating valve 2703. The gas filter 2702 is connected to a gas pneumatic shut-off valve 2704 at a position away from the manual gas shut-off valve 2701. The gas pneumatic shut-off valve 2704 is connected to a gas check valve 2705. The gas check valve 2705 is connected to a distributed direct-acting conveying unit 17. The pneumatic slag conveying system and the gas system are respectively provided with pressure detectors 19.

[0037] The pneumatic slag conveying system and the accompanying gas system are connected to a solenoid valve box 25, which is electrically connected to the pressure detector 19. The control of the solenoid valve box 25 can timely control the pneumatic slag conveying system, thereby improving the convenience of the pneumatic slag conveying system. When the pressure of the main slag conveying pipeline increases and reaches the set opening pressure, the step-by-step direct-acting conveying unit on the accompanying gas pipeline can be intelligently opened to replenish air and blow out the blockage. At the same time, the action of the upstream step-by-step direct-acting conveying unit is inhibited through the interconnected distributed control gas path, and the action of the downstream step-by-step direct-acting conveying unit is promoted, forming a sequential purge starting from the blocking point, so that the conveyed material moves forward in sections and steps under the action of the airflow, preventing and solving the blockage problem, and ensuring the safe operation of the conveying system. When the pressure is lower than the set value, the step-by-step direct-acting conveying unit automatically closes to stop the fluidized air supply, and ends the upstream suppression at the same time. The whole process does not require program control, and each step-by-step direct-acting conveying unit can work independently. By repeating this process continuously, efficient and stable transportation of heavy-loaded coarse slag materials can be achieved.

[0038] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should fall within the protection scope of the present invention.

Claims

1. Coarse slag heavy-load step-by-step direct-acting pneumatic conveying system, characterized by: It includes a feeding system, a crushing system, a buffer system, a bin pump (11), a pneumatic slag conveying system and a terminal slag bin (28), and each system is interconnected by a pipeline; The feeding system comprises an original slag bin (1), a discharge valve (2) is arranged in the original slag bin (1), the discharge valve (2) is connected to a feeding device (3), a position of the feeding device (3) away from the discharge valve (2) is connected to a crushing device (4), and a position of the crushing device (4) away from the discharge valve (2) is connected to a buffer system; The cache system comprises a cache slag bin (6), the cache slag bin (6) is provided with a manual feed valve (9), the manual feed valve (9) controls the opening and closing of the cache slag bin (6), and the cache slag bin (6) is connected to a bin pump (11); The silo pump (11) comprises a silo pump (11) with a pneumatic feed valve (10), the buffer slag silo (6) is first connected to the pneumatic feed valve (10) and then connected to the silo pump (11), and the silo pump (11) is connected to the terminal slag silo (28); The pneumatic slag conveying system comprises an air storage tank (22), the air storage tank (22) is provided with an air source control valve, the air storage tank (22) is connected to a main air intake assembly (20) through the air source control valve, the main air intake assembly (20) is connected to a bin pump air intake valve (13), the bin pump air intake valve (13) is connected to a bin pump (11), the bin pump air intake valve (13) controls the gas inside the air storage tank (22) to enter the bin pump (11), a plurality of distributed direct-acting conveying units (17) are provided between the bin pump (11) and the terminal slag bin (28), and the plurality of distributed direct-acting conveying units (17) are connected in sequence.

2. The coarse slag heavy-load step-by-step direct-acting pneumatic conveying system according to claim 1 is characterized by: A backup system is provided between the cache system and the terminal slag bin (28), the backup system comprising a backup bin pump (24), the cache slag bin (6) being connected to the backup bin pump (24), the cache slag bin (6) being connected to the backup bin pump (24) and the bin pump (11) respectively via a balancing valve (8), and the backup bin pump (24) being connected to the terminal slag bin (28) separately via a plurality of distributed direct-acting conveying units (17).

3. The coarse slag heavy-load step-by-step direct-acting pneumatic conveying system according to claim 2 is characterized by: The silo pump (11) and the standby silo pump (24) are both provided with a material level meter (12), and a discharge valve (14) is provided at the bottom end of the silo pump (11).

4. The coarse slag heavy-load step-by-step direct-acting pneumatic conveying system according to claim 3 is characterized by: The pneumatic slag conveying system is provided with a gas accompanying system, which includes an instrument compressed air unit (26). The instrument compressed air unit (26) provides airflow for the gas accompanying system. The instrument compressed air unit (26) is connected to a gas accompanying component (27), and the gas accompanying component (27) is respectively connected to each distributed direct-acting conveying unit (17).

5. The coarse slag heavy-load step-by-step direct-acting pneumatic conveying system according to claim 4 is characterized in that: The pneumatic slag conveying system and the accompanying gas system are respectively provided with a pressure detector (19).

6. The coarse slag heavy-load step-by-step direct-acting pneumatic conveying system according to claim 5 is characterized in that: The pneumatic slag conveying system and the accompanying gas system are commonly connected to a solenoid valve box (25), and the solenoid valve box (25) is electrically connected to a pressure detector (19).

7. The coarse slag heavy-load step-by-step direct-acting pneumatic conveying system according to claim 1 is characterized by: The main air intake assembly (20) comprises a manual shut-off valve (2001), one side of the manual shut-off valve (2001) is connected to the air storage tank (22), and the other side is connected to a filter (2002), the filter (2002) is connected to a pressure regulating valve (2003) at a position away from the manual shut-off valve (2001), the pressure regulating valve (2003) is connected to a pneumatic shut-off valve (2004), the pneumatic shut-off valve (2004) is connected to a check valve (2005), and the check valve (2005) is connected to a distributed direct-acting conveying unit (17).

8. The coarse slag heavy-load step-by-step direct-acting pneumatic conveying system according to claim 1 is characterized by: The accompanying gas component (27) includes an accompanying gas manual shut-off valve (2701), one side of the accompanying gas manual shut-off valve (2701) is connected to the instrument compressed air unit (26), and the other side is connected to the accompanying gas filter (2702), one end of the accompanying gas filter (2702) is provided with an accompanying gas pressure regulating valve (2703), the position of the accompanying gas filter (2702) away from the accompanying gas manual shut-off valve (2701) is connected to the accompanying gas pneumatic shut-off valve (2704), the accompanying gas pneumatic shut-off valve (2704) is connected to the accompanying gas check valve (2705), and the accompanying gas check valve (2705) is connected to the distributed direct-acting conveying unit (17).

9. The coarse slag heavy-load step-by-step direct-acting pneumatic conveying system according to claim 1 is characterized by: A screening device (5) is provided between the crushing device (4) and the buffer slag bin (6); the screening device (5) is independently connected to a lifting device (7); the bottom of the lifting device (7) is connected to the screening device (5), and the top of the lifting device (7) is connected to the original slag bin (1).

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