Explosion-proof airflow crushing system and control method

Abstract

The invention discloses an explosion-proof airflow pulverizing system and a control method, comprising: a fluidized bed airflow pulverizer, an inert gas source preparation machine, a raw material barrel, a plurality of valve systems, and a plurality of monitoring systems. The valve system comprises an electromagnetic vent valve, a three-way reversing valve, a pneumatic ball valve, a rotary feed valve, and a mechanical vent valve. The monitoring system comprises a flow monitor, an online dew point meter, an oxygen content analyzer, a pressure sensor, and an online particle size analyzer. The inert gas source preparation machine is connected to a control system, and the control system controls the operation of the entire system. In the explosion-proof airflow pulverizing system, the inert gas source preparation machine introduces inert gas into a pipeline, thereby reducing the contact between material dust and oxygen in the pipeline, which is beneficial to improving the safety of the pulverizing system. The inert gas compression and purification system introduces inert gas into the fluidized bed airflow pulverizer, thereby reducing the contact between the pulverized material and oxygen during the pulverizing process, thereby reducing the safety risk.

Description

Technical Field

[0001] The present invention relates to the technical field of material crushing, and in particular to an explosion-proof airflow crushing system and a control method. Background Art

[0002] Fluidized bed air flow mill is a machine that uses compressed air that has been frozen, filtered, and dried, and then forms a supersonic airflow through a nozzle and is injected into the grinding chamber, fluidizing the material. The accelerated material converges at the intersection of the jet airflows of several nozzles, producing violent collisions, friction, and shearing to achieve ultra-fine grinding of particles.

[0003] When the fluidized bed jet mill is in the process of crushing combustible materials, the fine materials are suspended in the air. When they reach a very high concentration, they will burn instantly when they encounter flames, sparks, electric arcs or appropriate temperatures. The crushed materials have a larger surface area, a larger area in contact with the air, more oxygen molecules are adsorbed, and the oxidation exothermic process is fast, which will form a violent explosion and create a safety risk. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an explosion-proof airflow pulverizing system and a control method.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an explosion-proof airflow pulverizing system, comprising: a fluidized bed airflow pulverizer, an inerting gas source preparation machine, a raw material barrel, a plurality of valve systems, and a plurality of monitoring systems, wherein the valve system comprises an electromagnetic vent valve, a three-way reversing valve, a pneumatic ball valve, a rotary feeding valve and a mechanical vent valve, and the monitoring system comprises a flow monitor, an online dew point meter, an oxygen content analyzer, a pressure sensor and an online particle size analyzer, the inerting gas source preparation machine is connected to a control system, and the control system controls the operation of the entire system, and the inerting gas source preparation machine fills inert gas into a pipeline through the control system, and a Roots blower is arranged on one side of the inerting gas source preparation machine, and the Roots blower is used to guide the direction of the airflow in the pipeline.

[0006] As a further description of the above technical solution: the raw material barrel is connected to the first dust collector and the silo through a pipeline, and the raw material barrel is fed into the silo through the first dust collector.

[0007] As a further description of the above technical solution: the silo is connected to the fluidized bed air flow pulverizer, the fluidized bed air flow pulverizer is connected to the second dust collector and the inert gas compression purification system through a pipeline, and the inert gas compression purification system is used to fill the fluidized bed air flow pulverizer with high-pressure inert gas.

[0008] As a further description of the above technical solution: the second dust collector is connected to the first finished product silo and the second finished product silo, the first finished product silo and the second finished product silo cooperate to output materials through the three-way reversing valve, and part of the material flows into the silo through the first dust collector along with the airflow in the pipeline.

[0009] As a further description of the above technical solution: the control system opens an inert gas supply port into the pipeline, the Roots blower includes a Roots blower body, the Roots blower body is connected to a secondary filter A, the Roots blower body is connected to a cooler through a pipeline, and the Roots blower body transports airflow toward the cooler.

[0010] As a further description of the above technical solution: the raw material barrel is connected to the pipeline through a pneumatic ball valve, an online dew point meter, an oxygen content analyzer, a three-way reversing valve and a pressure sensor are arranged on the pipeline connecting the cooler and the raw material barrel, a three-way reversing valve is arranged on the pipeline connecting the raw material barrel and the first dust collector, and a flow monitor, an inert gas replenishing port, a mechanical vent valve and an electromagnetic vent valve are arranged on the pipeline connecting the secondary filter A and the first dust collector.

[0011] As a further description of the above technical solution: the material bin includes a material bin to be crushed, the first dust collector is connected to the material bin to be crushed through a pneumatic ball valve, the material bin to be crushed is connected to a buffer material bin through a pneumatic ball valve, the buffer material bin is connected to a fluidized bed airflow pulverizer through a rotary feeding valve, a pressure sensor is arranged on the fluidized bed airflow pulverizer, an online particle size analyzer is arranged on the pipeline between the fluidized bed airflow pulverizer and the second dust collector, and a pneumatic ball valve and a three-way reversing valve are arranged on the second dust collector.

[0012] As a further description of the above technical solution: the inert gas compression and purification system includes a secondary filter B, the secondary filter B is connected to an air compressor, the air compressor is connected to an oil remover through a pipeline, the oil remover is connected to a first precision filter through a pipeline, the first precision filter is connected to a cold dryer through a pipeline, the cold dryer is connected to a second precision filter through a pipeline, the second precision filter is connected to the fluidized bed airflow pulverizer through a pipeline, a pneumatic ball valve, an online dew point meter, a pressure sensor and an oxygen content analyzer are arranged on the pipeline between the second precision filter and the fluidized bed airflow pulverizer, and an electromagnetic vent valve, a mechanical vent valve and an inert gas replenishment port are arranged on the pipeline between the second dust collector and the secondary filter B.

[0013] As a further description of the above technical solution: the material bin to be crushed includes an exhaust filter, the exhaust filter is arranged on the material bin to be crushed, and an explosion vent is arranged on the material bin to be crushed.

[0014] A control method for an explosion-proof airflow pulverizing system, comprising:

[0015] S1: Turn on the inert gas source preparation machine to produce inert gas, turn on the whole system, and the inert gas fills the entire pipeline along with the airflow generated by the Roots blower body, and continuously replenishes inert gas into the pipeline through the inert gas replenishing port, and the air in the pipeline is replaced by inert gas;

[0016] S2: The raw material barrel is put into the material, and the material flows into the first dust collector along with the airflow. The first dust collector removes the dust from the material and then sends it to the material bin to be crushed. The material in the material bin to be crushed passes through the buffer bin and enters the fluidized bed airflow mill for crushing;

[0017] S3: When the fluidized bed airflow mill is pulverizing, high-pressure compressed inert gas needs to be introduced for high-speed pulverization. The inert gas supply port introduces inert gas into the pipeline, and the inert gas flows into the inert gas compression purification system for pressurized purification. The pressurized and purified gas flows into the fluidized bed airflow mill through the pipeline;

[0018] S4: The crushed material passes through the online particle size analyzer along with the airflow. The online particle size analyzer detects the particle size of the crushed material powder. The powders that meet the particle size standard and those that do not meet the particle size standard are dedusted by the second dust collector and then passed into the first finished product silo and the second finished product silo.

[0019] S5: The qualified powder in the first finished product silo is output to the packaging equipment through the three-way reversing valve, and the unqualified powder in the second finished product silo is introduced into the pipeline through the three-way reversing valve and sent to the first dust collector by air for further processing from S2. The powder after further processing is output to the packaging equipment through the three-way reversing valve connected to the first finished product silo.

[0020] The above technical solution has the following advantages or beneficial effects:

[0021] 1. The inert gas source preparation machine introduces inert gas into the pipeline, which reduces the contact between material dust and oxygen in the pipeline and is beneficial to improving the safety of the crushing system.

[0022] 2. The inert gas compression and purification system introduces inert gas into the fluidized bed airflow pulverizer, which reduces the contact between the pulverized material and oxygen during the pulverizing process and reduces safety risks.

[0023] 3. The inert gas compression and purification system pressurizes and purifies the inert gas introduced into the fluidized bed air flow pulverizer, thereby increasing the pressure inside the fluidized bed air flow pulverizer to facilitate pulverization, and the purified inert gas is beneficial to reducing the impurities entering the fluidized bed air flow pulverizer.

[0024] 4. The materials in the second finished product silo that do not meet the particle size standards are circulated to the fluidized bed airflow mill and crushed again until the particle size meets the standards, which is beneficial to improving the crushing quality of the crushing system.

[0025] 5. The monitoring system monitors the inert gas in the pipeline. The monitoring system cooperates with the valve system to stabilize the pressure of the inert gas in the pipeline, which is beneficial to enhance the explosion-proof performance of the pipeline in the crushing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A flow chart of an explosion-proof airflow pulverizing system proposed by the present invention;

[0027] Figure 2 This is a schematic diagram of a material bin to be crushed in an explosion-proof airflow crushing system proposed by the present invention.

[0028] Legend:

[0029] 1. Inert gas source preparation machine; 2. Control system; 3. Inert gas supply port; 4. Roots blower; 41. Roots blower body; 42. Secondary filter A; 43. Cooler; 5. Valve system; 51. Solenoid vent valve; 52. Three-way reversing valve; 53. Pneumatic ball valve; 54. Rotary feed valve; 55. Mechanical vent valve; 6. Monitoring system; 61. Flow monitor; 62. Online dew point meter; 63. Oxygen content analyzer; 64. Pressure sensor; 65. Online particle size analyzer; 7. Raw material barrel; 8. First dust collector; 9. Silo; 91. Silo for crushing; 911. Exhaust filter; 912. Explosion vent; 92. Buffer silo; 10. Fluidized bed airflow pulverizer; 11. Second dust collector; 12. First finished product silo; 13. Second finished product silo; 14. Inert gas compression and purification system; 141. Secondary filter B; 142. Air compressor; 143. Degreaser; 144. First precision filter; 145. Cold dryer; 146. Second precision filter. DETAILED DESCRIPTION

[0030] 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.

[0031] Reference Figure 1~Figure 2An embodiment of the present invention includes: a fluidized bed airflow mill 10, an inerting gas source preparation machine 1, a raw material barrel 7, a plurality of valve systems 5, and a plurality of monitoring systems 6. The valve system 5 includes an electromagnetic vent valve 51, a three-way reversing valve 52, a pneumatic ball valve 53, a rotary feed valve 54, and a mechanical vent valve 55. The monitoring system 6 includes a flow monitor 61, an online dew point meter 62, an oxygen content analyzer 63, a pressure sensor 64, and an online particle size analyzer 65. The inerting gas source preparation machine 1 is connected to a control system 2, and the control system 2 controls the operation of the entire system. The inerting gas source preparation machine 1 fills the pipeline with inert gas through the control system 2. A Roots blower 4 is arranged on one side of the inerting gas source preparation machine 1, and the Roots blower 4 is used to guide the airflow direction in the pipeline.

[0032] The control system 2 opens an inert gas supply port 3 into the pipeline. The Roots blower 4 includes a Roots blower body 41. The Roots blower body 41 is connected to a secondary filter A42. The Roots blower body 41 is connected to a cooler 43 through a pipeline. The Roots blower body 41 delivers airflow toward the cooler 43.

[0033] The raw material barrel 7 is connected to the first dust collector 8 and the silo 9 through a pipeline. The raw material barrel 7 feeds the silo 9 through the first dust collector 8. The raw material barrel 7 is connected to the pipeline through a pneumatic ball valve 53. An online dew point meter 62, an oxygen content analyzer 63, a three-way reversing valve 52 and a pressure sensor 64 are arranged on the pipeline connecting the cooler 43 and the raw material barrel 7. A three-way reversing valve 52 is arranged on the pipeline connecting the raw material barrel 7 and the first dust collector 8. A flow monitor 61, an inert gas replenishing port 3, a mechanical vent valve 55 and an electromagnetic vent valve 51 are arranged on the pipeline connecting the secondary filter A42 and the first dust collector 8. The silo 9 is connected to the fluidized bed air flow pulverizer 10. The fluidized bed air flow pulverizer 10 is connected to the second dust collector 11 and the inert gas compression purification system 14 through a pipeline. The inert gas compression purification system 14 is used to fill the fluidized bed air flow pulverizer 10 with high-pressure inert gas to assist the fluidized bed air flow pulverizer 10 in pulverizing materials.

[0034] The inert gas compression and purification system 14 includes a secondary filter B141, which is connected to an air compressor 142, which is connected to an oil remover 143 through a pipeline, which is connected to a first precision filter 144 through a pipeline, which is connected to a cold dryer 145 through a pipeline, which is connected to a second precision filter 146 through a pipeline, which is connected to a fluidized bed airflow pulverizer 10 through a pipeline, and a pneumatic ball valve 53, an online dew point meter 62, a pressure sensor 64 and an oxygen content analyzer 63 are arranged on the pipeline between the second precision filter 146 and the fluidized bed airflow pulverizer 10, and an electromagnetic vent valve 51, a mechanical vent valve 55 and an inert gas supply port 3 are arranged on the pipeline between the second dust collector 11 and the secondary filter B141, and the exhaust filter 911 on the second dust collector 11 passes the gas into the secondary filter B141 for re-filtration, and reuses it after filtration, thereby saving costs.

[0035] The second dust collector 11 is connected to the first finished product silo 12 and the second finished product silo 13. The first finished product silo 12 and the second finished product silo 13 cooperate to output materials with qualified particle size through the three-way reversing valve 52, and materials with unqualified particle size flow into the silo 9 through the first dust collector 8 along with the airflow in the pipeline.

[0036] The silo 9 includes a silo 91 to be crushed, the first dust collector 8 is connected to the silo 91 to be crushed via a pneumatic ball valve 53, the silo 91 to be crushed includes an exhaust filter 911, the exhaust filter 911 is arranged on the silo 91 to be crushed, and the silo 91 to be crushed is provided with an explosion vent 912, the first finished product silo 12 and the second finished product silo 13 have the same structure as the silo 91 to be crushed, so the functions of the first finished product silo 12 and the second finished product silo 13 are interchangeable, and the first finished product silo 12 and the second finished product silo 13 are both provided with an exhaust filter 911 and an explosion vent 912, the silo 9 to be crushed The buffer bin 92 is connected to the fluidized bed airflow pulverizer 10 through the pneumatic ball valve 53, and the buffer bin 92 is connected to the fluidized bed airflow pulverizer 10 through the rotary feed valve 54. The fluidized bed airflow pulverizer 10 is provided with a pressure sensor 64. An online particle size analyzer 65 is provided on the pipeline between the fluidized bed airflow pulverizer 10 and the second dust collector 11. The online particle size analyzer 65 analyzes the particle size of the pulverized material. The second dust collector 11 is provided with a pneumatic ball valve 53 and a three-way reversing valve 52, and the material powders with particle sizes that meet the standards and those that do not meet the standards analyzed by the online particle size analyzer 65 are respectively introduced into the first finished product bin 12 and the second finished product bin 13.

[0037] A control method for an explosion-proof airflow pulverizing system, comprising:

[0038] S1: Turn on the inert gas source preparation machine 1 to produce inert gas, turn on the whole system, the inert gas fills the whole pipeline along with the airflow generated by the Roots blower body 41, and continuously replenishes the inert gas into the pipeline through the inert gas replenishing port 3, the electromagnetic vent valve 51 and the mechanical vent valve 55 discharge the air in the pipeline, and the air in the pipeline is replaced by inert gas, which reduces the contact between material dust and oxygen in the pipeline, and is conducive to improving the safety of the pulverizing system;

[0039] S2: The raw material barrel 7 is fed with material, and the material flows into the first dust collector 8 along with the airflow. The first dust collector 8 removes dust from the material and then sends it to the material bin 91 to be crushed. The material in the material bin 91 to be crushed passes through the buffer bin 92 and enters the fluidized bed airflow mill 10 for crushing;

[0040] S3: When the fluidized bed air flow mill 10 is being crushed, it is necessary to introduce high-pressure compressed inert gas for high-speed crushing. The inert gas supply port 3 introduces inert gas into the pipeline, and the inert gas flows into the inert gas compression purification system 14 for pressurized purification. The pressurized and purified gas flows into the fluidized bed air flow mill 10 through the pipeline, increasing the pressure inside the fluidized bed air flow mill 10 to facilitate crushing, and the purified inert gas is conducive to reducing impurities entering the fluidized bed air flow mill 10;

[0041] S4: The crushed material body passes through the online particle size analyzer 65 along with the air flow, and the online particle size analyzer 65 detects the particle size of the crushed material body. The powders that meet the particle size standard and those that do not meet the particle size standard are dedusted by the second dust collector 11 and then passed into the first finished product bin 12 and the second finished product bin 13. The first finished product bin 12 and the second finished product bin 13 have the same structure, so the functions of the first finished product bin 12 and the second finished product bin 13 can be interchanged;

[0042] S5: The qualified powder in the first finished product silo 12 is output to the packaging equipment through the three-way reversing valve 52, and the substandard powder in the second finished product silo 13 is passed into the pipeline through the three-way reversing valve 52 and blown to the first dust collector 8 for further processing from S2. The re-processed powder is output to the packaging equipment through the three-way reversing valve 52 connected to the first finished product silo 12.

[0043] Working principle: The Roots blower body 41 determines the direction of the inert gas flow in the pipeline, the raw material barrel 7 puts the material down, the material passes through the first dust collector 8 into the to-be-crushed material bin 91, and then is passed into the second dust collector 11 after being crushed by the fluidized bed airflow pulverizer 10. The inert gas pressurized by the air compressor 142 and filtered by the second precision filter 146 is passed into the fluidized bed airflow pulverizer 10 for auxiliary crushing. The second dust collector 11 separates the material dust analyzed by the online particle size analyzer 65 into the first finished product bin 12 and the second finished product bin 13. The first finished product bin 12 outputs qualified materials, and the unqualified materials in the second finished product bin 13 are passed into the first dust collector 8 in the pipeline to continue to participate in subsequent crushing.

[0044] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An explosion-proof airflow crushing system, comprising: A fluidized bed air flow mill (10), an inert gas source preparation machine (1), a raw material barrel (7), a plurality of valve systems (5), and a plurality of monitoring systems (6), wherein the valve system (5) comprises an electromagnetic vent valve (51), a three-way reversing valve (52), a pneumatic ball valve (53), a rotary feed valve (54), and a mechanical vent valve (55), and the monitoring system (6) comprises a flow monitor (61), an online dew point meter (62), an oxygen content analyzer (63), a pressure sensor (64), and an online particle size analyzer (65), characterized in that: the inert gas source preparation machine (1) is connected to a control system (2), the control system (2) controls the operation of the entire system, and the inert gas source preparation machine (1) fills an inert gas into a pipeline through the control system (2); A Roots blower (4) is provided on one side of the inert gas source preparation machine (1), and the Roots blower (4) is used to guide the direction of airflow in the pipeline; The raw material barrel (7) is connected to the first dust collector (8) and the material bin (9) via a pipeline, and the raw material barrel (7) feeds the material into the material bin (9) via the first dust collector (8); The silo (9) is connected to the fluidized bed air flow pulverizer (10), and the fluidized bed air flow pulverizer (10) is connected to a second dust collector (11) and an inert gas compression purification system (14) via a pipeline, and the inert gas compression purification system (14) is used to fill the fluidized bed air flow pulverizer (10) with high-pressure inert gas; The second dust collector (11) is connected to the first finished product bin (12) and the second finished product bin (13), and the first finished product bin (12) and the second finished product bin (13) cooperate to output materials via the three-way reversing valve (52); The control system (2) is provided with an inert gas supply port (3) in the pipeline, the Roots blower (4) comprises a Roots blower body (41), the Roots blower body (41) is connected to a secondary filter A (42), the Roots blower body (41) is connected to a cooler (43) via a pipeline, and the Roots blower body (41) delivers airflow in the direction of the cooler (43); The raw material barrel (7) is connected to a pipeline via a pneumatic ball valve (53); an online dew point meter (62), an oxygen content analyzer (63), a three-way reversing valve (52) and a pressure sensor (64) are arranged on the pipeline connecting the cooler (43) and the raw material barrel (7); a three-way reversing valve (52) is arranged on the pipeline connecting the raw material barrel (7) and the first dust collector (8); a flow monitor (61), an inert gas supply port (3), a mechanical vent valve (55) and an electromagnetic vent valve (51) are arranged on the pipeline connecting the secondary filter A (42) and the first dust collector (8); The material bin (9) comprises a material bin to be crushed (91); the first dust collector (8) is connected to the material bin to be crushed (91) via a pneumatic ball valve (53); the material bin to be crushed (91) is connected to a buffer material bin (92) via a pneumatic ball valve (53); the buffer material bin (92) is connected to a fluidized bed air flow pulverizer (10) via a rotary feed valve (54); a pressure sensor (64) is provided on the fluidized bed air flow pulverizer (10); an online particle size analyzer (65) is provided on the pipeline between the fluidized bed air flow pulverizer (10) and the second dust collector (11); and the second dust collector (11) is provided with a pneumatic ball valve (53) and a three-way reversing valve (52); The inert gas compression and purification system (14) comprises a secondary filter B (141), the secondary filter B (141) is connected to an air compressor (142), the air compressor (142) is connected to an oil remover (143) via a pipeline, the oil remover (143) is connected to a first precision filter (144) via a pipeline, the first precision filter (144) is connected to a cold dryer (145) via a pipeline, the cold dryer (145) is connected to a second precision filter (146) via a pipeline, and the second The precision filter (146) is connected to the fluidized bed air flow pulverizer (10) via a pipeline; a pneumatic ball valve (53), an online dew point meter (62), a pressure sensor (64) and an oxygen content analyzer (63) are arranged on the pipeline between the second precision filter (146) and the fluidized bed air flow pulverizer (10); and an electromagnetic vent valve (51), a mechanical vent valve (55) and an inert gas supply port (3) are arranged on the pipeline between the second dust collector (11) and the secondary filter B (141); The material bin to be crushed (91) comprises an exhaust filter (911), the exhaust filter (911) being arranged on the material bin to be crushed (91), and an explosion vent (912) being arranged on the material bin to be crushed (91).

2. A control method using the explosion-proof airflow pulverizing system of claim 1, characterized in that: include: S1: The inert gas source preparation machine (1) is turned on to produce inert gas, and the entire system is turned on. The inert gas fills the entire pipeline along with the airflow generated by the Roots blower body (41), and the inert gas is continuously replenished into the pipeline through the inert gas replenishing port (3), and the air in the pipeline is replaced by the inert gas; S2: the raw material barrel (7) is charged with material, and the material flows into the first dust collector (8) along with the airflow. The first dust collector (8) removes dust from the material and then sends it to the material bin to be crushed (91). The material in the material bin to be crushed (91) passes through the buffer bin (92) and enters the fluidized bed airflow mill (10) for crushing; S3: When the fluidized bed air flow mill (10) is being pulverized, it is necessary to introduce high-pressure compressed inert gas for high-speed pulverization. The inert gas supply port (3) introduces inert gas into the pipeline, and the inert gas flows into the inert gas compression purification system (14) for pressurized purification. The pressurized and purified gas flows into the fluidized bed air flow mill (10) through the pipeline; S4: The pulverized material passes through an online particle size analyzer (65) along with the air flow. The online particle size analyzer (65) detects the particle size of the pulverized material. The powders that meet the particle size standards and those that do not meet the particle size standards are dedusted by a second dust collector (11) and then passed into a first finished product bin (12) and a second finished product bin (13); S5: the powder that meets the standards in the first finished product silo (12) is output to the packaging equipment through the three-way reversing valve (52), and the powder that does not meet the standards in the second finished product silo (13) is introduced into the pipeline through the three-way reversing valve (52) and sent by air to the first dust collector (8) to be processed again in the order of S2. The powder that has been processed again is output to the packaging equipment through the three-way reversing valve (52) connected to the first finished product silo (12).

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