Silo belt corridor fresh air system

Abstract

A silo belt corridor fresh air system comprises an air exhaust / supply device arranged outside a silo, a fan is arranged on a shell of the air exhaust / supply device, an air purification device is arranged in the air exhaust / supply device, and blowdown devices are arranged at low-lying positions of an air supply pipeline and an air exhaust pipeline respectively. A plurality of gas detectors are further arranged in the belt corridor; the fan, the blowdown device and the gas detector are all in signal connection with the control box; the controller controls the on-site fan to start and stop through the output signal of the circuit breaker, so that toxic and harmful gas can be actively exhausted to the outside through the exhaust pipeline, and the environmental safety in a belt corridor is ensured; the system can realize closed-loop operation, unattended operation and automatic operation, and has the characteristics of high reliability and capability of switching between manual operation and remote operation.

Description

Technical Field

[0001] The present invention relates to the technical field of coal storage silos, and particularly to a fresh air system for the belt corridor of a silo. Background Art

[0002] At present, coal storage in silos has the characteristics of clean storage, small floor area, and convenient coal storage, and is widely used in various industries such as electric power, chemical industry, and coal mines. With the continuous increase in the coal storage volume, there are more and more large-capacity and group silos. Therefore, the coal unloading belt corridors at the bottom of the silos are getting longer and longer. In addition, some coal unloading belt corridors of large-capacity silos are built underground, which will cause poor air flow in the belt corridors.

[0003] Secondly, in order to extend the coal storage time, newly built silos are equipped with silo safety monitoring and inerting protection system devices. When the coal in the silo is unloaded, the inert gas and other toxic and harmful gases filled in the silo will be discharged together with the unloading. Although some silos have special ventilation shafts, the air circulation effect is poor, and there are no relevant safety equipment and measures. At this time, if there is no reliable ventilation system, it is very likely to cause gas poisoning or hypoxia problems for the staff, and even threaten life.

[0004] Chinese Patent CN201520222080.5 discloses a ventilation column for a dust removal system of an underground coal conveying corridor, including a column body. The column body is a hollow pipe, its upper end is connected to the rain shelter of the coal unloading ditch, and the top extends upward through the rain shelter of the coal unloading ditch. The lower end of the column body passes through the coal hopper concrete beam and is connected to the dust collector exhaust pipe. The ventilation column for the dust removal system of the underground coal conveying corridor can greatly improve the working environment of the underground coal conveying corridor, is beneficial to the physical health of the operators, combines the rain shelter column and the ventilation pipe into one, saves land, is arranged compactly and simply, and can greatly improve the working environment of the underground coal conveying corridor. However, since this system only aims at dust removal ventilation and does not monitor and feedback on toxic and harmful gases, it cannot automatically change the air according to the concentration of toxic and harmful gases, and there are potential safety hazards. Summary of the Invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the present invention is to provide a fresh air system for the belt corridor of a silo, which uses monitoring sensors set at different points in the corridor to monitor various indicators in real time, and transmits the monitored data to an external display in the corridor through a control box for display. When different indicators exceed the standard, the exhaust or air supply device is triggered, and the air inside the corridor is automatically replaced or updated through each ventilation pipe, which can achieve automatic monitoring and automatic linkage, ensure the cleanliness and safety of the air inside the corridor, thereby ensuring the safety of the staff, and has the characteristics of convenient operation and cost saving.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is:

[0007] A fresh air system for a silo belt corridor, comprising an exhaust / supply air device 1 arranged outside the silo. A fan 12 is provided on the outer shell of the exhaust / supply air device 1, and an air purification device 2 is arranged inside the exhaust / supply air device 1. The air inlet of the supply air duct 4 is connected to the exhaust / supply air device 1 through the air purification device 2. The supply air duct 4 is arranged inside the belt corridor 9 below the silo. A number of air supply outlets 11 are provided on the supply air duct 4. The air outlet of the exhaust air duct 5 is connected to the exhaust / supply air device 1 through the air purification device 2. The exhaust air duct 5 is arranged inside the belt corridor 9. A number of air exhaust outlets 10 are provided on the exhaust air duct 5. Drainage devices 7 are respectively arranged at the low-lying parts of the supply air duct 4 and the exhaust air duct 5; A number of gas detectors 8 are also arranged inside the belt corridor 9; The fan 12, the drainage device 7 and the gas detector 8 are all connected to the control box 3 by signals.

[0008] The control box 3 includes a controller 13. The signal input end of the controller 13 is connected to the signal output end of the gas detector 8; A display screen 6 is arranged on the outer shell of the control box 3. The signal output end of the controller 13 is connected to the signal input end of the display screen 6; A communication module 14 is also arranged inside the control box 3. The signal output end of the controller 13 is connected to the signal input end of the communication module 14; A circuit breaker 15 is arranged inside the control box 3. The controller 13 is in bidirectional signal connection with the circuit breaker 15. The signal output end of the circuit breaker 15 is connected to the signal input end of the fan 12; The signal input end of the drainage device 7 is connected to the signal output end of the controller 13; A rotary switch 16, an alarm indicator light 17, an emergency stop button 18 and an interface 19 are also arranged on the shell of the control box 3. The signal input ends of the rotary switch 16, the alarm indicator light 17, the emergency stop button 18 and the interface 19 are all connected to the signal output end of the controller 13.

[0009] The interface 19 includes an RS485 interface and an industrial Ethernet interface.

[0010] The supply air duct 4 is a square pipe type duct connected by multiple flanges, and the material is selected as stainless steel.

[0011] The exhaust air duct 5 is a square pipe type duct connected by multiple flanges, and the material is selected as stainless steel.

[0012] The gas detector 8 includes a dust concentration sensor, a toxic gas detector and an oxygen sensor.

[0013] The number of the gas detectors 8 is determined according to the number of the inspection positions inside the belt corridor 9.

[0014] The gas detector 8 can replace the corresponding gas monitoring sensor according to the actual environment of the belt corridor 9.

[0015] Based on the above fresh air system for the silo belt corridor, the following control strategy is adopted:

[0016] Step 1: First, the gas detectors 8 set at each inspection position of the belt corridor 9 are used to continuously monitor the dust concentration, toxic gas concentration, and oxygen concentration in the belt corridor, and transmit the data to the controller 13 for centralized display on the display screen 6;

[0017] Step 2: When the toxic gas concentration exceeds the set value, or the oxygen concentration is lower than the set value, or the dust concentration is greater than the set value, the controller 13 controls the alarm indicator light 17 to light up, and automatically activates the exhaust or air supply mode. When the exhaust / air supply device 1 starts, the fan 12 is turned on, and the fresh air filtered by the air purification device 2 is conveyed into the belt corridor through the air supply pipe 4, or the toxic and harmful gases are discharged outside the belt corridor 9 through the exhaust pipe 5;

[0018] Step 3: During the operation of the exhaust / air supply device 1, the gas detector 8 continuously monitors the gas environment in the belt corridor and transmits the data to the controller 13. When indicators such as the dust concentration, toxic gas concentration, and oxygen concentration return to normal levels, the controller 13 controls the fan 12 to stop running and enters the standby monitoring state.

[0019] The beneficial effects of the present invention are as follows:

[0020] A fresh air system for a silo belt corridor, where a fan 12 is provided on the outer shell of the exhaust / air supply device 1. Since the air supply pipe 4 is arranged inside the belt corridor 9 under the silo, several air supply ports 11 are provided on the air supply pipe 4, the exhaust pipe 5 is arranged inside the belt corridor 9, several gas detectors 8 are also arranged inside the belt corridor 9, and a control box 3 is provided at the entrance of the belt corridor 9. The signal output end of the control box 3 is connected to the signal input end of the fan 12, and the signal input end of the control box 3 is connected to the signal output end of the gas detector 8. It can automatically control the air renewal operation in closed environments such as the belt corridor. Compared with the original silo safety monitoring and inerting protection system that only includes oxygen concentration monitoring, when the oxygen concentration is low, only natural ventilation and other methods can be used to make the oxygen concentration normal; the signal input end of the sewage discharge device 7 is connected to the signal output end of the controller 13, which can control the system to automatically discharge sewage.

[0021] Through the monitoring and analysis of the environmental gas in the silo belt corridor, the air supply device automatically provides fresh air to the enclosed environment, greatly reducing the time for the oxygen concentration to recover and improving safety. In addition, when the inerting protection system fills the silo with inert gas for a long time, during the coal unloading process in the silo, a large amount of inert gas and toxic and harmful gases overflow from the discharge port along with the coal flow, greatly increasing the risk for on-site operators. However, the controller 13 of the present invention outputs a signal through the circuit breaker 15 to control the start and stop of the on-site fan 12, and can actively discharge the toxic and harmful gases to the outside through the exhaust duct 5, thus ensuring the environmental safety in the belt corridor. In addition, an interface 19, including an RS485 interface and an industrial Ethernet interface, is provided on the outer shell of the control box 3, which can be used for the centralized control center equipment to read relevant data.

[0022] In summary, the present invention can achieve closed-loop operation, unattended operation, and automatic operation, and has the characteristics of high reliability, and can be switched between manual operation and remote operation. Brief Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the present invention.

[0024] Figure 2 is a working flow chart of the present invention.

[0025] Figure 3 is a circuit block diagram of the control box 3 of the present invention.

[0026] Wherein: 1, exhaust / air supply device; 2, air purification device; 3, control box; 4, air supply duct; 5, exhaust duct; 6, display screen; 7, sewage discharge device; 8, gas detector; 9, belt corridor; 10, exhaust port; 11, air supply port; 12, fan; 13, controller; 14, communication module; 15, circuit breaker; 16, rotary switch; 17, alarm indicator light; 18, emergency stop button; 19, interface. Detailed Description of the Preferred Embodiment

[0027] The present invention will be further described in detail below with reference to the accompanying drawings.

[0028] See Figure 1, A new air system device for the silo belt corridor, including an exhaust / supply air device 1 arranged outside the silo. An air purification device 2 is provided inside the exhaust / supply air device 1. The air inlet of the supply air duct 4 is connected to the exhaust / supply air device 1 through the air purification device 2. The control box 3 is connected to the fan 12 of the exhaust / supply air device 1 and is also connected to gas detectors 8 arranged at various inspection points inside the belt corridor 9. The control box 3 analyzes, processes all on-site signals and issues corresponding instructions. The outside of the supply air duct 4 is connected to the exhaust / supply air device 1, and its inside is arranged to the belt corridor 9, and air supply openings 11 are provided at each inspection point. The outside of the exhaust duct 5 is connected to the exhaust / supply air device 1, and its inside is arranged to the belt corridor 9, and exhaust openings are provided at each inspection point. A display screen 6 is provided on the outer shell of the control box 3 for real-time display of various data inside the belt corridor 9. The control box 3 is arranged at the entrance of the belt corridor 9 to facilitate maintenance personnel to have a clearer understanding of the environment inside the corridor before entering. The sewage discharge device 7 is arranged at the low-lying parts of the supply air duct 4 and the exhaust duct 5. The gas detectors 8 are arranged at the main inspection positions inside the belt corridor 9 for real-time monitoring of various indicators inside the belt corridor 9.

[0029] An interface 19, including an RS485 interface and an industrial Ethernet interface, is provided on the outer shell of the control box 3 for the centralized control center equipment to read relevant data.

[0030] The exhaust / supply air device 1 includes several explosion-proof fans 12, which can realize exhaust and supply air, and the air volume of the fans 12 can be configured as required according to the size of the corridor environment and ventilation requirements.

[0031] The air purification device 2 is installed inside the exhaust / supply air device 1, at the front parts of the supply air duct 4 and the exhaust duct 5, for filtering sundries and dust in the air during supply air and dust inside the corridor during exhaust.

[0032] See Figure 3, the control box 3 is a customized complete set of control box. The controller 13 installed in the control box 3 analyzes, processes all on-site signals and issues corresponding instructions. The signal input end of the controller 13 is connected to the signal output end of the gas detector 8; a display screen 6 is arranged on the outer shell of the control box 3, and the signal output end of the controller 13 is connected to the signal input end of the display screen 6, and the monitored data can be displayed on the display screen 6; a communication module 14 is also arranged in the control box 3, and the signal output end of the controller 13 is connected to the signal input end of the communication module 14, and all data can be transmitted to other upper-level control systems through the communication module 14; a circuit breaker 15 is arranged in the control box 3, and the controller 13 is bidirectionally signal-connected to the circuit breaker 15. The signal output end of the circuit breaker 15 is connected to the signal input end of the fan 12, and the controller 13 controls the start and stop of the on-site fan 12 by outputting signals through the circuit breaker 15; the signal output end of the control box 3 is connected to the signal input end of the fan 12; the signal input end of the sewage discharge device 7 is connected to the signal output end of the controller 13 for automatic sewage discharge and maintenance.

[0033] A rotary switch 16, an alarm indicator light 17, an emergency stop button 18 and an interface 19 are also arranged on the shell of the control box 3. The signal input ends of the rotary switch 16, the alarm indicator light 17, the emergency stop button 18 and the interface 19 are all connected to the signal output end of the controller 13; the rotary switch 16 controls the automatic and manual conversion; when the concentration of toxic gas exceeds the set value or the concentration of oxygen is lower than the set value or the concentration of dust is greater than the set value, the alarm indicator light 17 lights up; in an emergency, the emergency stop button 18 can control the emergency stop of the fan 12; the interface 19 includes an RS485 interface and an industrial Ethernet interface, which can be used for the centralized control center equipment to read relevant data.

[0034] The air supply duct 4 is a square pipe type duct connected by multiple flanges. The material is selected as stainless steel, which has high anti-corrosion performance and can be used for a long time. The starting point of the air supply duct 4 is the air supply duct interface on the air supply / exhaust device 1, and the end point is arranged at the inner end of the belt corridor 9, and air supply outlets are arranged at each inspection point.

[0035] The exhaust duct 5 is a square pipe type duct connected by multiple flanges. The material is selected as stainless steel, which has high anti-corrosion performance and can be used for a long time. The starting point of the exhaust duct 5 is the exhaust duct interface on the air supply / exhaust device 1, and the end point is arranged at the inner end of the belt corridor 9, and exhaust outlets are arranged at each inspection point and near the silo discharge port.

[0036] The display screen 6 is arranged at the entrance of the belt corridor 9, and there are two types of the display 6 to choose from, namely an explosion-proof LED dot matrix screen and a touch screen.

[0037] The gas detector 8 generally includes a dust concentration sensor, a toxic gas detector and an oxygen sensor.

[0038] The number of the gas detectors 8 varies according to the number of internal inspection positions in the belt corridor 9. Generally, one set of gas detectors 8 is configured for each discharge outlet at the lower end of the silo. When the discharge outlet is the annular coal feeder outlet, four sets are provided.

[0039] The gas detector 8 can also replace the corresponding gas monitoring sensor according to the actual environment of the belt corridor 9.

[0040] See Figure 2 , the controller 13 of the present invention is configured with self-developed control software for realizing the ventilation control of a fresh air system for a silo belt corridor of the present invention:

[0041] Step 1: First, the gas detectors 8 arranged at each inspection position in the belt corridor 9 are used to continuously monitor the dust concentration, toxic gas concentration, and oxygen concentration in the belt corridor, and transmit the data to the controller 13 and centrally display it on the display screen 6;

[0042] Step 2: When the toxic gas concentration exceeds the set value, or the oxygen concentration is lower than the set value, or the dust concentration is greater than the set value, the controller 13 controls the alarm indicator light 17 to light up and automatically turns on the exhaust or air supply mode. When the exhaust / air supply device 1 starts, the fan 12 is turned on, and the fresh air filtered by the air purification device 2 is conveyed into the belt corridor through the air supply pipe 4 or the toxic and harmful gases are discharged outside the belt corridor 9 through the exhaust pipe 5;

[0043] Step 3: During the operation of the exhaust / air supply device 1, the gas detector 8 continuously monitors the gas environment in the belt corridor and transmits the data to the controller 13. When the indicators such as the dust concentration, toxic gas concentration, and oxygen concentration all return to the normal level, the controller 13 controls the fan 12 to stop running and enters the standby monitoring state.

Claims

1. A silo belt corridor fresh air system, characterized in that: The invention comprises an exhaust / air supply device (1) arranged outside the silo, a fan (12) being arranged on the outer shell of the exhaust / air supply device (1), an air purification device (2) being arranged inside the exhaust / air supply device (1), an air inlet of an air supply duct (4) being connected to the exhaust / air supply device (1) through the air purification device (2), the air supply duct (4) being arranged inside a belt corridor (9) below the silo, a plurality of air supply ports (11) being arranged on the air supply duct (4), and an air outlet of the exhaust duct (5) The outlet is connected to the exhaust / air supply device (1) through an air purification device (2); the exhaust duct (5) is arranged inside the belt corridor (9); a plurality of exhaust outlets (10) are arranged on the exhaust duct (5); low-lying parts of the air supply duct (4) and the exhaust duct (5) are respectively provided with sewage discharge devices (7); a plurality of gas detectors (8) are also arranged inside the belt corridor (9); the fan (12), the sewage discharge device (7) and the gas detector (8) are all connected to the control box (3) by signal.

2. A silo belt corridor fresh air system according to claim 1, characterized in that: The control box (3) comprises a controller (13), the signal input end of the controller (13) being connected to the signal output end of the gas detector (8); a display screen (6) is arranged on the outer shell of the control box (3), the signal output end of the controller (13) being connected to the signal input end of the display screen (6); a communication module (14) is also arranged in the control box (3), the signal output end of the controller (13) being connected to the signal input end of the communication module (14); a circuit breaker (15) is arranged in the control box (3), the controller (13) and the circuit breaker are connected to each other. (15) a two-way signal connection, the signal output end of the circuit breaker (15) is connected to the signal input end of the fan (12); the signal input end of the sewage discharge device (7) is connected to the signal output end of the controller (13); the control box (3) is also provided with a rotary switch (16), an alarm indicator light (17), an emergency stop button (18) and an interface (19), and the signal input ends of the rotary switch (16), the alarm indicator light (17), the emergency stop button (18) and the interface (19) are all connected to the signal output end of the controller (13).

3. A silo belt corridor fresh air system according to claim 1, characterized in that: The outer shell of the control box (3) is provided with an interface (19), including an RS485 interface and an industrial Ethernet interface.

4. A silo belt corridor fresh air system according to claim 1, characterized in that: The air supply duct (4) is a square tube-type duct connected by multiple flange sections, and the material is stainless steel.

5. A silo belt corridor fresh air system according to claim 1, characterized in that: The exhaust duct (5) is a square tube-shaped duct connected by multiple flange sections, and the material is stainless steel.

6. A silo belt corridor fresh air system according to claim 1, characterized in that: The gas detector (8) comprises a dust concentration sensor, a toxic gas detector and an oxygen sensor.

7. A silo belt corridor fresh air system according to claim 1, characterized in that: The number of the gas detectors (8) is determined according to the number of inspection positions inside the belt corridor (9).

8. A silo belt corridor fresh air system according to claim 1, characterized in that: The gas detector (8) can be replaced with a corresponding gas monitoring sensor according to the actual environment of the belt corridor (9).

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