Ventilation system and method for underground coal conveying vestibule

Abstract

The underground coal conveying vestibule ventilation system comprises a fresh air handling unit, an air exhaust unit, an air supply pipe, an air exhaust pipe, a high-speed operation air supply pipe, a high-speed operation air exhaust pipe, a low-speed operation air supply outlet, a low-speed operation air exhaust outlet, a high-speed operation air exhaust outlet and a high-speed operation air supply outlet, and the fresh air handling unit is connected with the air supply pipe longitudinally arranged on one side of an underground vestibule; the air supply pipe is provided with a low-speed operation air supply outlet, the exhaust pipe is provided with a low-speed operation exhaust outlet, and the high-speed operation air supply pipe is arranged at the end, provided with the fresh air handling unit, of the underground vestibule and connected with the inlet end of the air supply pipe. The high-speed operation exhaust pipe is arranged at the end, provided with the exhaust unit, of the underground vestibule and connected with the outlet end of the exhaust pipe. Through reasonable arrangement of the air pipes, occupation of the inner space of the vestibule is reduced, and the requirement for large air volume during accident ventilation is met. The occupied space is small, and various working conditions can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation for underground corridors used for coal transportation, and in particular to a ventilation system and method for an underground coal transportation corridor. Background Art

[0002] The coal handling corridor under the cylindrical coal bunker is a semi-enclosed space. A ventilation system must be set up to ensure air circulation in the corridor to avoid heat accumulation and the accumulation of harmful flammable dust and gas, thereby reducing safety hazards. Especially in the winter in the north, due to the influence of the climate, the doors and windows of the upper platform and the doors of the lower platform need to be closed to keep warm. There is almost no fresh air supply in the underground coal handling corridor, which brings great harm to the health of operators and maintenance personnel. Due to the limited space of the underground corridor, the actual ventilation system is mostly mechanical air supply and natural exhaust or mechanical exhaust and natural air supply to reduce the space occupied by the ventilation duct, but such a setting will result in uneven air volume and ventilation dead corners in the corridor. The existing ventilation system also does not fully consider the ventilation volume under accident conditions, and the actual ventilation volume is insufficient. In the winter in the northern region, the heat loss caused by ventilation cannot be balanced. For the purpose of insulation, the ventilation system is basically inactive in winter, which brings great safety hazards.

[0003] Defects and shortcomings of the existing technology:

[0004] (1) It is difficult to ensure the amount of fresh air with the existing ventilation methods, especially in the northern regions in winter, in order to maintain the temperature inside the building, almost no fresh air enters, which brings great harm to the health of operators and maintenance personnel.

[0005] (2) Only focusing on normal ventilation without considering the air volume under accident conditions, resulting in insufficient air volume in the ventilation system.

[0006] (3) The ventilation airflow organization is unreasonable, resulting in uneven air volume and ventilation dead corners in the corridor.

[0007] (4) The air duct layout is unreasonable, occupying a large space inside the corridor, and even expanding the corridor cross-section to arrange the air duct, resulting in increased investment costs and complex structure. Summary of the invention

[0008] The purpose of the present invention is to provide a ventilation system and method for an underground coal transportation corridor, which includes a mechanical air supply system at one end of the corridor and a mechanical exhaust system at the other end. The fresh air unit contains a fresh air preheating section, which can effectively solve the heat balance problem of winter ventilation. This method combines duct ventilation and tunnel ventilation to reduce the occupation of the internal space of the corridor and meet the demand for large air volume during accident ventilation. The ventilation method of the present invention has reasonable airflow organization, occupies little space, and can be applied to a variety of working conditions.

[0009] To achieve the above object, the present invention adopts the following technical solutions:

[0010] A ventilation system for an underground coal transportation corridor, comprising a fresh air unit, an exhaust air unit, a low-speed air supply pipe, a low-speed exhaust pipe, a high-speed air supply pipe, a high-speed exhaust pipe, a low-speed air supply port, a low-speed exhaust port, a high-speed exhaust port, and a high-speed air supply port, wherein the fresh air unit is arranged at one end of the underground corridor, the fresh air unit is connected to the low-speed air supply pipe, the low-speed air supply pipe is longitudinally arranged on one side of the underground corridor, the exhaust air unit is arranged at the other end of the underground corridor, the exhaust air unit is connected to the low-speed exhaust pipe, and the low-speed exhaust pipe is longitudinally arranged on the other side of the underground corridor On the side, the low-speed air supply pipe is longitudinally arranged with a plurality of low-speed air supply ports, the low-speed exhaust pipe is longitudinally arranged with a plurality of low-speed exhaust ports, the high-speed air supply pipe is arranged at one end of the underground corridor where a fresh air unit is arranged and is connected to the inlet end of the low-speed air supply pipe through an air supply electric valve, the high-speed air supply pipe is provided with a plurality of high-speed air supply ports, the high-speed exhaust pipe is arranged at one end of the underground corridor where an exhaust unit is arranged and is connected to the outlet end of the low-speed exhaust pipe through an exhaust electric valve, and the high-speed exhaust pipe is provided with a plurality of high-speed exhaust ports.

[0011] The air inlet of the fresh air unit is higher than the outdoor floor and is connected to the external atmosphere of the underground corridor.

[0012] The exhaust fan unit is connected to an exhaust chimney leading to the outside of the underground corridor, and the wind hood on the top of the exhaust chimney is higher than the power shadow area of ​​the roof.

[0013] The fresh air unit is provided with a filtering section and a preheating section.

[0014] The heating medium of the preheating section is steam or hot water or electric heating.

[0015] The low-speed air supply port, low-speed air exhaust port, high-speed air exhaust port and high-speed air supply port are all single-layer louver air ports.

[0016] A ventilation method for an underground coal conveying corridor ventilation system, wherein the air supply fan in the fresh air unit and the exhaust fan in the exhaust air unit are both dual-speed high-pressure centrifugal fans, which have two states of low-speed operation and high-speed operation. The low-speed operation is adopted in normal working conditions, and the high-speed operation is adopted in accident working conditions. Specifically:

[0017] 1) Low-speed operation state: The air supply fan of the fresh air unit and the exhaust fan of the exhaust air unit are both running at low speed, the air supply electric valve and the exhaust air electric valve are closed, the fresh air unit supplies positive pressure air to one longitudinal side of the underground corridor through the low-speed running air supply pipe and the low-speed running air supply outlet, and the exhaust air unit inhales the air in the underground corridor from the other longitudinal side of the underground corridor through the low-speed running exhaust pipe and the low-speed running exhaust outlet for negative pressure exhaust;

[0018] 2) High-speed operation state: the supply fan of the fresh air unit and the exhaust fan of the exhaust fan unit are both running at high speed, the supply air electric valve and the exhaust air electric valve are opened, a part of the fresh air enters the low-speed supply air duct and is positively pressure supplied to the longitudinal side of the underground corridor through the low-speed supply air duct and the low-speed supply air outlet, and the exhaust fan unit sucks the air in the underground corridor from the other longitudinal side of the underground corridor through the low-speed exhaust air duct and the low-speed exhaust air outlet for negative pressure exhaust; another part of the fresh air is sent into one end of the underground corridor from the high-speed supply air outlet, and the underground coal transportation corridor itself is used for tunnel ventilation. At the other end of the underground corridor, the high-speed exhaust air outlet negatively sucks the air in the underground corridor and discharges it through the exhaust fan unit.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1) A fresh air supply system is provided to ensure the fresh air volume in the working space inside the corridor, which is not affected by the closing of doors and windows. At the same time, a preheating section is provided in the fresh air unit to heat the incoming fresh air to reduce heat loss in winter, maintain the thermal balance inside the corridor, and ensure hygiene and comfort. The heating medium used in the preheating section can be steam, hot water or power supply, which is flexible and diverse.

[0021] 2) The supply and exhaust fans use two-speed high-pressure centrifugal fans. They run at low speed during normal ventilation and can be interlocked with the concentration alarm device. They run at high speed in the event of an accident. This method can reduce the number of fans and pipelines, reduce the floor space and construction difficulty, save investment, and take into account the air volume requirements for normal ventilation and emergency ventilation.

[0022] 3) This ventilation method sets up a mechanical air supply system at one end of the corridor and a mechanical exhaust system at the other end of the corridor, which are extended to the inside of the corridor through pipes to form a reasonable air flow organization and avoid uneven air volume and ventilation dead corners.

[0023] 4) Due to the space limitation in the underground coal transportation corridor, the air supply and exhaust ducts are set according to the air volume when the fan is running at low speed. An electric air valve that opens when the fan is running at high speed is set at the fan end duct. This air valve is interlocked with the fan, closed when the fan is running at low speed, and opened when the fan is running at high speed. When the fan is running at high speed, part of the air volume is used for underground ventilation in the coal transportation corridor itself, ensuring that the wind speed in the cross section of the coal transportation corridor is 0.3-4m / s, without dust and blowing feeling, meeting the requirements of the relevant specifications.

[0024] In summary, the present invention can effectively solve a series of problems arising in the actual operation of the underground coal conveying corridor ventilation system. The system is simple, low in investment cost, compact in structure, easy in construction, easy to use, applicable to a variety of working conditions, and occupies a small area. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of the ventilation system of the present invention.

[0026] Figure 2 It is a top view of the underground corridor of the ventilation system of the present invention.

[0027] In the figure: 1. fresh air unit, 2. exhaust fan unit, 3. air supply electric valve, 4. exhaust air electric valve, 5. low-speed air supply outlet, 6. low-speed exhaust outlet, 7. high-speed air supply outlet, 8. high-speed exhaust outlet, 9. low-speed air supply duct, 10. low-speed exhaust duct, 11. air inlet, 12. wind hood, 13. air supply room, 14. exhaust room, 15. high-speed air supply duct, 16. high-speed exhaust duct. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only for illustration and are not intended to limit the present invention.

[0029] like Figure 1 , Figure 2 As shown, an underground coal transportation corridor ventilation system includes a fresh air unit 1, an exhaust air unit 2, a low-speed running air supply pipe 9, a low-speed running exhaust pipe 10, a high-speed running air supply pipe 15, a high-speed running exhaust pipe 16, a low-speed running air supply port 5, a low-speed running exhaust port 6, a high-speed running exhaust port 8, and a high-speed running air supply port 7. The fresh air unit 1 is arranged at one end of the underground corridor, and the fresh air unit 1 is connected to the low-speed running air supply pipe 9 through a main air supply pipe. The low-speed running air supply pipe 9 is longitudinally arranged on one side of the underground corridor. The exhaust air unit 2 is arranged at the other end of the underground corridor. The exhaust air unit 2 is connected to the low-speed running exhaust pipe 10 through the main exhaust pipe. The low-speed running The exhaust duct 10 is longitudinally arranged on the other side of the underground corridor, and a plurality of low-speed air supply outlets 5 are longitudinally arranged on the low-speed air supply duct 9. A plurality of low-speed exhaust outlets 6 are longitudinally arranged on the low-speed exhaust duct 10. The high-speed air supply duct 15 is arranged at one end of the underground corridor where the fresh air unit 1 is arranged and is connected to the main air supply duct through the air supply electric valve 3. The high-speed air supply duct 15 is provided with a plurality of high-speed air supply outlets 7. The high-speed exhaust duct 16 is arranged at one end of the underground corridor where the exhaust unit 2 is arranged and is connected to the main exhaust duct through the exhaust electric valve 4. The high-speed exhaust duct 16 is provided with a plurality of high-speed exhaust outlets 8.

[0030] The air inlet 11 of the fresh air unit 1 is higher than the outdoor floor and is connected to the external atmosphere of the underground corridor.

[0031] The exhaust fan unit 2 is connected to an exhaust chimney leading to the outside of the underground corridor, and the wind hood 12 on the top of the exhaust chimney is higher than the power shadow area of ​​the roof.

[0032] The fresh air unit 1 is provided with a filtering section and a preheating section.

[0033] The heating medium of the preheating section is steam or hot water or electric heating.

[0034] The low-speed air supply port 5, the low-speed air exhaust port 6, the high-speed air exhaust port 8 and the high-speed air supply port 7 are all single-layer louver air ports.

[0035] A ventilation method for an underground coal conveying corridor ventilation system, wherein the air supply fan in the fresh air unit and the exhaust fan in the exhaust air unit are both dual-speed high-pressure centrifugal fans, which have two states of low-speed operation and high-speed operation. The low-speed operation is adopted in normal working conditions, and the high-speed operation is adopted in accident working conditions. Specifically:

[0036] 1) Low-speed operation state: the air supply fan of the fresh air unit 1 and the exhaust fan of the exhaust air unit 2 are both running at low speed, the air supply electric valve 3 and the exhaust air electric valve 4 are closed, the fresh air unit 1 supplies positive pressure air to one longitudinal side of the underground corridor through the low-speed running air supply pipe 9 and the low-speed running air supply port 5, and the exhaust air unit 2 inhales the air in the underground corridor from the other longitudinal side of the underground corridor through the low-speed running exhaust pipe 10 and the low-speed running exhaust port 6 to perform negative pressure exhaust;

[0037] 2) High-speed operation state: the air supply fan of the fresh air unit 1 and the exhaust fan of the exhaust unit 2 are both running at high speed, the air supply electric valve 3 and the exhaust electric valve 4 are opened, a part of the fresh air enters the low-speed supply air duct 9 and is positively pressure supplied to the longitudinal side of the underground corridor through the low-speed supply air outlet 5, and the exhaust unit 2 sucks the air in the underground corridor from the other longitudinal side of the underground corridor through the low-speed exhaust air duct 10 and the low-speed exhaust air outlet 6 for negative pressure exhaust; another part of the fresh air is sent into one end of the underground corridor from the high-speed supply air outlet 7, and the coal conveying corridor itself is used for tunnel ventilation. At the other end of the underground corridor, the air in the underground corridor is negatively pressure sucked in through the high-speed exhaust air outlet 8 and discharged through the exhaust unit 2.

[0038] The underground coal transportation corridor ventilation system of the present invention includes two major parts: an air supply system and an exhaust system. An air supply room 13 and an exhaust room 14 are respectively set on the ground at both ends of the underground corridor, and the fresh air unit 1 and the exhaust air unit 2 are placed in their respective rooms. Since the two rooms are far apart and separated by buildings, there is no short-circuit problem between the introduced fresh air and exhaust air. The fresh air unit 1 is provided with a preheating section to meet the winter ventilation needs in the northern region. The air supply fan and the exhaust fan use dual-speed centrifugal fans, which run at low speed during normal ventilation and at high speed during accidents. This setting can reduce the number of fans, reduce the floor space, save investment, and take into account the air volume requirements for normal ventilation and accident ventilation. The low-speed supply air duct 9 and the low-speed exhaust air duct 10 are respectively arranged on both sides of the length direction of the underground corridor according to the air volume when the fans are running at low speed, for normal ventilation; when the fans are running at high speed, their respective electric air valves are opened, and part of the air volume is used for ventilation through the air ducts, and part of the air volume is used for tunnel ventilation through the underground coal transportation corridor itself. This air duct setting method can form a reasonable airflow organization, avoid uneven air volume and ventilation dead corners, reduce the occupied internal space of the corridor, reduce the amount of air duct materials, and also reduce the construction difficulty.

[0039] The equipment, facilities, working principles and precautions of the ventilation system of the present invention are as follows: the fresh air unit 1 includes a filter section, a preheating section, and a fan section, and other functional sections can also be added according to actual needs. The heating medium used in the preheating section can be steam, hot water or power. The preheating section is turned on in winter to heat the fresh air, and it is disabled in summer and transition seasons. The fan section has two operating conditions: high-speed operation and low-speed operation. It runs at low speed during normal times and runs at high speed during accident conditions. The operating mode of the fresh air unit 1 can be adjusted manually or interlocked with a concentration alarm device. The air inlet 11 is set on the outer wall of the air supply room 13. Note that the bottom edge of the air inlet 11 should be 2 meters higher than the outdoor floor. When the outdoor is a green area, the air inlet 11 should not be less than 1 meter from the outdoor floor. The air supply electric valve 3 is closed when the fresh air unit 1 is running at a low speed, and is opened when the fresh air unit 1 is running at a high speed. The low-speed air supply pipe 9 is set according to the air volume when the fan is running at a low speed to reduce the occupation of the internal space of the corridor. The low-speed air supply vent 5 and the high-speed air supply vent 7 are both single-layer louver vents. The exhaust fan unit 2 uses a dual-speed centrifugal explosion-proof type. Because the corridor contains flammable and explosive dust and gases, the exhaust fan unit 2 has two operating conditions: high-speed operation and low-speed operation. It runs at a low speed during normal times and at a high speed during accident conditions. The exhaust electric valve 4 is closed when the exhaust fan unit 2 runs at a low speed, and opens when the exhaust fan unit 2 runs at a high speed. The low-speed exhaust duct 10 is set according to the air volume when the exhaust fan unit 1 runs at a low speed to reduce the space occupied inside the corridor. The low-speed exhaust vent 6 and the high-speed exhaust vent 8 are both single-layer louver vents. The setting height of the hood 12 needs to be above the roof power shadow area to facilitate exhaust.

[0040] The working process of the ventilation system of the present invention is as follows: the air supply system introduces outdoor fresh air into the fresh air unit 1 through the air inlet 11 and the air duct, and after being processed by the fresh air unit 1, it is sent to one side of the underground corridor through the main air supply duct, the low-speed air supply duct 9 and the low-speed air supply port 5. The exhaust system, under the negative pressure generated by the exhaust unit 2, sucks the dirty air in the underground corridor through the low-speed exhaust duct 10 and the low-speed exhaust port 6 set on the other side of the corridor, and then discharges it to the outdoors through the main exhaust duct, the exhaust unit 2 and the exhaust pipe. During normal ventilation, the fresh air unit 1 and the exhaust unit 2 run at low speed, and the air supply electric valve 3 and the exhaust electric valve 4 are closed; when an accident condition or the concentration detection device alarms, the fresh air unit 1 and the exhaust unit 2 run at high speed, and the air supply electric valve 3 and the exhaust electric valve 4 are opened. When this ventilation mode is set in the northern region, the fresh air unit 1 needs to be equipped with a preheating section to heat the fresh air in winter to reduce heat loss and maintain the internal heat balance of the corridor, and it should be deactivated in summer and transition seasons. The ventilation mode shown in the figure is only for illustration and reference. In actual application, corresponding adjustments can be made based on the ideas shown in the figure and combined with the actual situation on site.

[0041] The advantages of the present invention are as follows:

[0042] 1) The ventilation system can operate stably all year round and is suitable for a variety of working conditions and climatic conditions. It effectively protects the personal safety and health of operators and maintenance personnel and improves production efficiency and labor efficiency.

[0043] 2) By selecting a dual-speed fan, the number of fans used is reduced, the equipment investment cost is reduced, and the floor space occupied is reduced.

[0044] 3) Because the ventilation system uses a two-speed fan, it has low operating energy consumption, low pollution emissions, and good energy-saving and emission reduction effects.

[0045] 4) The ventilation system has simple duct setting, reduced construction difficulty, and occupies little space inside the corridor.

[0046] 5) The coal handling corridor itself is used for underground ventilation, which reduces ventilation dead corners and the amount of duct material, increasing ventilation effects while reducing costs.

[0047] 6) The ventilation system is easy to operate and convenient to switch working conditions.

[0048] The above is a schematic description of the invention and its implementation methods, which is not restrictive. Therefore, if a person skilled in the art is inspired by it and, without departing from the purpose of the invention, designs a structure and implementation method similar to the technical solution without creativity, they should all fall within the scope of protection of this patent.

Claims

1. An underground coal conveying gallery ventilation system, characterized in that: The invention comprises a fresh air unit, an exhaust air unit, a low-speed air supply pipe, a low-speed exhaust pipe, a high-speed air supply pipe, a high-speed exhaust pipe, a low-speed air supply port, a low-speed exhaust port, a high-speed exhaust port and a high-speed air supply port, wherein the fresh air unit is arranged at one end of the underground corridor, the fresh air unit is connected to the low-speed air supply pipe, the low-speed air supply pipe is longitudinally arranged at one side of the underground corridor, the exhaust air unit is arranged at the other end of the underground corridor, the exhaust air unit is connected to the low-speed exhaust pipe, the low-speed exhaust pipe is longitudinally arranged at the other side of the underground corridor, and the low-speed A plurality of low-speed air supply outlets are longitudinally arranged on the operating air supply duct, a plurality of low-speed air exhaust outlets are longitudinally arranged on the low-speed air exhaust duct, the high-speed air supply duct is arranged at one end of the underground corridor where a fresh air unit is arranged and is connected to the inlet end of the low-speed air supply duct through an air supply electric valve, the high-speed air supply duct is provided with a plurality of high-speed air supply outlets, the high-speed exhaust duct is arranged at one end of the underground corridor where an exhaust unit is arranged and is connected to the outlet end of the low-speed exhaust duct through an exhaust electric valve, and the high-speed exhaust duct is provided with a plurality of high-speed exhaust outlets.

2. The underground coal handling corridor ventilation system according to claim 1, characterized in that: The air inlet of the fresh air unit is higher than the outdoor floor and is connected to the external atmosphere of the underground corridor.

3. The underground coal transportation corridor ventilation system according to claim 1, characterized in that: The exhaust fan unit is connected to an exhaust chimney leading to the outside of the underground corridor, and the wind hood on the top of the exhaust chimney is higher than the power shadow area of ​​the roof.

4. An underground coal handling gallery ventilation system according to claim 1 or 2, characterized in that: The fresh air unit is provided with a filtering section and a preheating section.

5. The underground coal transportation corridor ventilation system according to claim 4, characterized in that: The heating medium of the preheating section is steam or hot water or electric heating.

6. The underground coal transportation corridor ventilation system according to claim 1, characterized in that: The low-speed air supply port, low-speed air exhaust port, high-speed air exhaust port and high-speed air supply port are all single-layer louver air ports.

7. A ventilation method for an underground coal handling corridor ventilation system according to any one of claims 1 to 6, characterized in that: The air supply fan in the fresh air unit and the exhaust fan in the exhaust unit are both two-speed centrifugal fans, which are operated at a low speed in normal working conditions and at a high speed in accident conditions, specifically: 1) Low-speed operation state: The air supply fan of the fresh air unit and the exhaust fan of the exhaust air unit are both running at low speed, the air supply electric valve and the exhaust air electric valve are closed, the fresh air unit supplies positive pressure air to one longitudinal side of the underground corridor through the low-speed running air supply pipe and the low-speed running air supply outlet, and the exhaust air unit inhales the air in the underground corridor from the other longitudinal side of the underground corridor through the low-speed running exhaust pipe and the low-speed running exhaust outlet, and performs negative pressure exhaust; 2) High-speed operation state: the supply fan of the fresh air unit and the exhaust fan of the exhaust fan unit are both running at high speed, the supply air electric valve and the exhaust air electric valve are opened, a part of the fresh air enters the low-speed supply air duct and is positively pressure supplied to the longitudinal side of the underground corridor through the low-speed supply air duct and the low-speed supply air outlet, and the exhaust fan unit sucks the air in the underground corridor from the other longitudinal side of the underground corridor through the low-speed exhaust air duct and the low-speed exhaust air outlet for negative pressure exhaust; another part of the fresh air is sent into one end of the underground corridor from the high-speed supply air outlet, and the underground coal transportation corridor itself is used for tunnel ventilation. At the other end of the underground corridor, the high-speed exhaust air outlet negatively sucks the air in the underground corridor and discharges it through the exhaust fan unit.

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