Tunnel suspended ceiling type air purification and key exhaust smoke intensive system and operation method thereof

Abstract

A tunnel suspended ceiling type air purification and key exhaust smoke intensive system and a running method thereof, comprising: a main line tunnel, an exhaust smoke well, a suspended ceiling type air purification system channel and a key exhaust smoke channel; a pre-filter, an electrostatic dust removal device, a gas adsorption device and an axial flow fan are sequentially installed between the head and the tail in the air purification system channel; the air purification system channel and the key exhaust smoke channel are two channels independently arranged, and an inlet end of the key exhaust smoke channel is connected with a branch smoke channel; a first shunt conversion air chamber is arranged in the key exhaust smoke channel to connect the air purification system channel before the pre-filter and the main line tunnel; a second shunt conversion air chamber is arranged in the channel behind the axial flow fan to connect the exhaust smoke well and the main line tunnel; and a confluence conversion air chamber is arranged in the channel between the gas adsorption device and the axial flow fan to connect the end of the smoke channel; the present application reasonably controls a combined electric air valve, shares a large axial flow fan and realizes intensive design of the tunnel air purification system and the key exhaust smoke system.

Description

Technical Field

[0001] This invention belongs to the field of tunnel air purification technology, specifically a tunnel ceiling-mounted air purification and key smoke exhaust integrated system and its operation method. Background Technology

[0002] Currently, tunnel air purification systems are widely used abroad, particularly in Japan, South Korea, and Norway; however, only a small number of tunnel projects in China have adopted tunnel air purification technology.

[0003] Currently, in urban tunnels that simultaneously install air purification stations and smoke exhaust systems, as well as in highway tunnels that function as urban roads, the air purification stations and smoke exhaust systems are each set of separate equipment, which occupies a large space and wastes space resources.

[0004] Therefore, the primary problem to be solved by this invention is to study shared air purification and smoke exhaust systems, obtain integrated solutions for air purification and key smoke exhaust, rationally develop urban underground space, and promote the efficient use of space resources. Summary of the Invention

[0005] This invention discloses a tunnel ceiling-mounted integrated air purification and key smoke exhaust system and its operation method, aiming to solve the technical problem of integrated design of shared equipment for tunnel air purification and key smoke exhaust systems. Through the rational layout of air ducts and the opening and closing control of combined electric air valves, an integrated design of the tunnel air purification and key smoke exhaust system is achieved.

[0006] The technical solution of the present invention is as follows:

[0007] A tunnel ceiling-mounted air purification and key smoke exhaust integrated system includes: a main tunnel 8, a smoke exhaust shaft 11, and an air purification system channel suspended in the ceiling of the main tunnel; a pre-filter 1, an electrostatic dust removal device 2, a gas adsorption device 3, and an axial flow fan 9 are sequentially installed at both ends of the air purification system channel; characterized in that it also includes a key smoke exhaust duct 5.

[0008] The air purification system channel 100 and the key exhaust duct 5 are two independently constructed closed channels. The inlet end 51 of the key exhaust duct is connected to the branch exhaust duct 52. Each branch exhaust duct is connected to the main tunnel through multiple spaced smoke inlets 801 equipped with electric air valves. A first diversion conversion chamber 6 is set in the exhaust duct behind the inlet end of the key exhaust duct, connecting the air purification system channel at the front end of the pre-filter 1 and the main tunnel 8. A second diversion conversion chamber 10 is set in the end of the air purification system channel behind the axial flow fan 9, connecting the exhaust shaft 11 and the main tunnel 8. A merging conversion chamber 4 is set in the channel between the gas adsorption device 3 and the axial flow fan 9 in the air purification system channel.

[0009] The first diversion and conversion air chamber 6 includes a seventh, eighth, ninth, and tenth combined electric air valve; the first diversion and conversion air chamber is connected to the key exhaust ducts on both sides of the front and rear of the first diversion and conversion air chamber through the seventh combined electric air valve 18 and the tenth combined electric air valve 21; it is connected to the air purification system channel in front of the pre-filter 1 through the eighth combined electric air valve 19, and connected to the main tunnel 8 through the ninth combined electric air valve 20.

[0010] The confluence conversion air chamber 4 includes a first, second, and third combined electric air valve; the confluence conversion air chamber 4 is connected to the air purification system channel at the tail of the gas adsorption device 3 through the first combined electric air valve 12, connected to the end of the key exhaust duct behind the first diversion conversion air chamber through the second combined electric air valve 13, and connected to the air purification system channel in front of the axial flow fan 9 through the third combined electric air valve 14.

[0011] The second diversion and conversion air chamber 10 includes a fourth, fifth, and sixth combined electric air valve; the second diversion and conversion air chamber 10 is connected to the air purification system channel at the tail of the axial flow fan 9 through the fourth combined electric air valve 15, connected to the main tunnel 8 through the sixth combined electric air valve 17, and connected to the smoke exhaust shaft 11 and connected to the outlet end of the smoke exhaust shaft through the fifth combined electric air valve 16.

[0012] The tunnel ceiling-mounted air purification and key smoke exhaust integrated system includes two axial flow fans 9, one in use and one on standby.

[0013] In the aforementioned tunnel ceiling-mounted air purification and key smoke exhaust integrated system, preferably, the branch smoke ducts are one or two.

[0014] The operation method of the tunnel ceiling-mounted air purification and key smoke exhaust intensive system, wherein, in the tunnel air purification mode, the seventh combined electric air valve 18, the tenth combined electric air valve 21, the second combined electric air valve 13, and the fifth combined electric air valve 16 are closed; the eighth combined electric air valve 19, the ninth combined electric air valve 20, the first combined electric air valve 12, the third combined electric air valve 14, the fourth combined electric air valve 15, and the sixth combined electric air valve 17 are open.

[0015] The system operates as follows: Polluted air in the main tunnel 8 enters the first diversion and conversion air chamber 6 through the ninth combined electric air valve 20, enters the air purification duct through the eighth combined electric air valve 19, passes through the pre-filter 1, electrostatic dust removal device 2, and gas adsorption device 3 in sequence, enters the confluence conversion air chamber 4 through the first combined electric air valve 12, enters the axial flow fan 9 through the third combined electric air valve 14, enters the second diversion and conversion air chamber 10 through the fourth combined electric air valve 15, and the air treated by the sixth combined electric air valve 17 is reinjected into the main tunnel 8.

[0016] The operation method of the tunnel ceiling-mounted air purification and key smoke exhaust intensive system, wherein, in the tunnel key smoke exhaust mode, the eighth combined electric air valve 19, the ninth combined electric air valve 20, the first combined electric air valve 12, and the sixth combined electric air valve 17 are closed, and the seventh combined electric air valve 18, the tenth combined electric air valve 21, the second combined electric air valve 13, the third combined electric air valve 14, the fourth combined electric air valve 15, and the fifth combined electric air valve 16 are open.

[0017] The system operates as follows: the flue gas in the main exhaust duct 5 enters the first diversion and conversion chamber 6 through the seventh combined electric air valve 18, enters the main exhaust duct 5 through the tenth combined electric air valve 21, enters the confluence conversion chamber 4 through the second combined electric air valve 13, enters the axial flow fan 9 through the third combined electric air valve 14, enters the second diversion conversion chamber 10 through the fourth combined electric air valve 15, and enters the exhaust shaft 11 through the fifth combined electric air valve 16 before being discharged from the exhaust shaft outlet.

[0018] Beneficial effects of the present invention

[0019] This invention provides a tunnel ceiling-mounted integrated air purification and key smoke exhaust system. Compared with existing air purification technologies, this system achieves an integrated design of the tunnel air purification system and the key smoke exhaust system through the rational control of combined electric air valves and the sharing of a large axial flow fan. The organic combination of the key smoke exhaust system and the air purification system effectively reduces initial equipment investment and saves on fan room building area. During operation, the fan operates in the same direction for both air purification and key smoke exhaust modes, which facilitates the selection of large axial flow fans.

[0020] This invention proposes an operation method for a tunnel ceiling-mounted air purification and key smoke exhaust integrated system. This method increases the frequency of use of axial flow fans under normal operating conditions and improves the equipment reliability rate of axial flow fans during fires. It also optimizes the footprint of the equipment room and reduces the initial investment in equipment. This is of great significance for the rational use of urban underground space and saving project costs. Attached Figure Description

[0021] Figure 1 This is a schematic elevation view of the overall structure of the present invention.

[0022] Figure 2 This is a schematic diagram of the air purification system channel room structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the connection structure between the branch flue inlet and the main tunnel.

[0024] Figure 4 This is a schematic diagram illustrating the operating principle of the air purification system of the present invention.

[0025] Figure 5 This is a schematic diagram of the operating principle of the key smoke exhaust system of this invention.

[0026] Explanation of the attached diagram numbers: 1-Pre-filter; 2-Electrostatic dust removal device; 3-Gas adsorption device; 4-Combined conversion air chamber; 5-Key flue, inlet end 51, branch flue 52; 6-First diversion conversion air chamber; 7-Flue; 8-Main tunnel, 801-Smoke inlet; 9-Axial flow fan; 10-Second diversion conversion air chamber; 11-Smoke exhaust shaft; 12-First combined electric air valve; 13-Second combined electric air valve; 14-Third combined electric air valve; 15-Fourth combined electric air valve; 16-Fifth combined electric air valve; 17-Sixth combined electric air valve; 18-Seventh combined electric air valve; 19-Eighth combined electric air valve; 20-Ninth combined electric air valve; 21-Tenth combined electric air valve; 22-Electric smoke exhaust valve (one every 60m along the tunnel boring machine); 100-Air purification system channel. Detailed Implementation

[0027] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0028] In the description of this invention, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] See Figure 1-3As shown, the present invention discloses a tunnel ceiling-mounted air purification and key smoke exhaust integrated system, comprising: a main tunnel 8, a smoke exhaust shaft 11, and an air purification system channel suspended in the ceiling of the main tunnel; a pre-filter 1, an electrostatic dust removal device 2, a gas adsorption device 3, and an axial flow fan 9 are sequentially installed at both ends of the air purification system channel; it also includes a key smoke exhaust duct 5; the key smoke exhaust duct 5 can be located in the interlayer between the main tunnel 8 and the air purification system channel 100, and is arranged in the same direction, see [reference]. Figure 1 As shown;

[0030] The air purification system channel 100 and the key exhaust duct 5 are two independently constructed closed channels. The inlet end 51 of the key exhaust duct is connected to the branch exhaust duct 52. Each branch exhaust duct is connected to the main tunnel through multiple spaced smoke inlets 801 equipped with electric air valves. A first diversion conversion chamber 6 is set in the exhaust duct behind the inlet end of the key exhaust duct, connecting the air purification system channel at the front end of the pre-filter 1 and the main tunnel 8. A second diversion conversion chamber 10 is set in the end of the air purification system channel behind the axial flow fan 9, connecting the exhaust shaft 11 and the main tunnel 8. A merging conversion chamber 4 is set in the channel between the gas adsorption device 3 and the axial flow fan 9 in the air purification system channel. The branch exhaust duct 52 can be set on the extension line of the key exhaust duct 5.

[0031] See Figure 1 As shown, the first diversion and conversion air chamber 6 includes a seventh, eighth, ninth, and tenth combined electric air valve; the first diversion and conversion air chamber is connected to the key exhaust ducts on both sides of the front and rear of the first diversion and conversion air chamber through the seventh combined electric air valve 18 and the tenth combined electric air valve 21; it is connected to the air purification system channel in front of the pre-filter 1 through the eighth combined electric air valve 19, and to the main tunnel 8 through the ninth combined electric air valve 20;

[0032] The confluence conversion air chamber 4 includes a first, second, and third combined electric air valve; the confluence conversion air chamber 4 is connected to the air purification system channel at the tail of the gas adsorption device 3 through the first combined electric air valve 12, connected to the end of the key exhaust duct behind the first diversion conversion air chamber through the second combined electric air valve 13, and connected to the air purification system channel in front of the axial flow fan 9 through the third combined electric air valve 14.

[0033] The second diversion and conversion air chamber 10 includes a fourth, fifth, and sixth combined electric air valve; the second diversion and conversion air chamber 10 is connected to the air purification system channel at the tail of the axial flow fan 9 through the fourth combined electric air valve 15, connected to the main tunnel 8 through the sixth combined electric air valve 17, and connected to the smoke exhaust shaft 11 and connected to the outlet end of the smoke exhaust shaft through the fifth combined electric air valve 16.

[0034] The tunnel ceiling-mounted air purification and key smoke exhaust integrated system, preferably, has one air purification system channel, one key smoke exhaust duct, and one or two branch smoke ducts, or multiple ducts as needed. Two axial flow fans 9 are configured, one in operation and one on standby. Each fan is equipped with a third combined electric damper 14 and a fourth combined electric damper 15, respectively. (See [reference]). Figure 2 As shown.

[0035] See Figure 1-4 As shown, the operation method of the tunnel ceiling-mounted air purification and key smoke exhaust intensive system includes the following: In tunnel air purification mode, the seventh combined electric air valve 18, the tenth combined electric air valve 21, the second combined electric air valve 13, and the fifth combined electric air valve 16 are closed; the eighth combined electric air valve 19, the ninth combined electric air valve 20, the first combined electric air valve 12, the third combined electric air valve 14, the fourth combined electric air valve 15, and the sixth combined electric air valve 17 are open.

[0036] The system operates as follows: Polluted air in the main tunnel 8 enters the first diversion and conversion air chamber 6 through the ninth combined electric air valve 20, and then enters the air purification system channel through the eighth combined electric air valve 19. After passing through the pre-filter 1, electrostatic dust removal device 2, and gas adsorption device 3 in sequence, it enters the confluence conversion air chamber 4 through the first combined electric air valve 12, enters the axial flow fan 9 through the third combined electric air valve 14, enters the second diversion and conversion air chamber 10 through the fourth combined electric air valve 15, and the air treated by the sixth combined electric air valve 17 is reinjected into the main tunnel 8.

[0037] See Figure 1-3 As shown in Figure 5, the operation method of the tunnel ceiling-mounted air purification and key smoke exhaust intensive system is as follows: In the tunnel key smoke exhaust mode, the eighth combined electric air valve 19, the ninth combined electric air valve 20, the first combined electric air valve 12, and the sixth combined electric air valve 17 are closed, while the seventh combined electric air valve 18, the tenth combined electric air valve 21, the second combined electric air valve 13, the third combined electric air valve 14, the fourth combined electric air valve 15, and the fifth combined electric air valve 16 are open.

[0038] The system operates as follows: the flue gas in the main exhaust duct 5 enters the first diversion and conversion chamber 6 through the seventh combined electric air valve 18, enters the main exhaust duct 5 through the tenth combined electric air valve 21, enters the confluence conversion chamber 4 through the second combined electric air valve 13, enters the axial flow fan 9 through the third combined electric air valve 14, enters the second diversion conversion chamber 10 through the fourth combined electric air valve 15, and enters the exhaust shaft 11 through the fifth combined electric air valve 16 before being discharged from the exhaust shaft outlet.

[0039] See Figures 1-3 As shown, this invention provides a tunnel ceiling-mounted air purification and key smoke exhaust integrated system. The air purification system channel, key smoke exhaust duct 5, and smoke exhaust shaft 11, which are suspended in the main tunnel, are all located below ground level, and the outlet end of the smoke exhaust shaft is connected to the ground level. The function of the merging and splitting air chamber is realized by the first to tenth combined electric air valves.

[0040] The integrated system functions mainly rely on the confluence conversion air chamber 4 and its control valve, axial flow fan 9, first diversion conversion air chamber 6, second diversion conversion air chamber 10 and its control valve.

[0041] The selection of axial flow fan 9 should simultaneously meet the air volume and pressure requirements for air purification and key smoke exhaust. The air volume for air purification should meet the pollutant concentration requirements at sensitive points around the tunnel entrance, and the pressure should take into account the final resistance of the purification equipment. The air volume for key smoke exhaust should meet the smoke exhaust requirements corresponding to the heat release rate of a tunnel fire, and the pressure should fully consider the friction resistance along the key smoke exhaust duct. Pre-filter 1, electrostatic precipitator 2, and gas adsorption device 3 should be selected as needed, using existing conventional technologies.

[0042] The combined electric air valve in this invention is usually composed of several small air valves spliced ​​together to form a larger air valve, which is a traditional technology and will not be described in detail here.

[0043] Ceiling-mounted air purification refers to installing an air purification system at the top of a tunnel. It draws in a certain proportion of polluted air from the tunnel, purifies it through the system, and then sends it back into the tunnel.

[0044] The present invention provides a tunnel ceiling-mounted air purification and key smoke exhaust integrated system with two modes: a tunnel air purification mode and a tunnel key smoke exhaust mode. The working principles of the two modes are as follows:

[0045] 1. Tunnel air purification mode

[0046] See Figure 1 , Figure 2 and Figure 4As shown, in tunnel air purification mode, the second combined electric air valve 13, the fifth combined electric air valve 16, the seventh combined electric air valve 18, and the tenth combined electric air valve 21 are closed; the first combined electric air valve 12, the third combined electric air valve 14, the fourth combined electric air valve 15, the sixth combined electric air valve 17, the eighth combined electric air valve 19, and the ninth combined electric air valve 20 are open. The system operates as follows: Polluted air in the main tunnel enters the first diversion and conversion chamber 6 through the ninth combined electric air valve 20, and then enters the air purification duct through the eighth combined electric air valve 19. After passing through the pre-filter 1, electrostatic dust removal device 2, and gas adsorption device 3 in sequence, it enters the confluence conversion chamber 4 through the first combined electric air valve 12, and then enters the axial flow fan 9 through the third combined electric air valve 14. In the air purification mode, one or two fans of the axial flow fan 9 can be turned on according to the usage requirements. The air then enters the second diversion and conversion chamber 10 through the fourth combined electric air valve 15, and the air treated by the sixth combined electric air valve 17 is reinjected into the main tunnel.

[0047] 2. Tunnel-specific smoke extraction mode

[0048] See Figure 1 , Figure 3 and Figure 5 As shown, in the tunnel's key smoke extraction mode, the first combined electric air valve 12, the sixth combined electric air valve 17, the eighth combined electric air valve 19, and the ninth combined electric air valve 20 are closed, while the second combined electric air valve 13, the third combined electric air valve 14, the fourth combined electric air valve 15, the fifth combined electric air valve 16, the seventh combined electric air valve 18, and the tenth combined electric air valve 21 are open. The system operates as follows: Smoke from the main tunnel 8 enters the branch flue 52 via the combined electric damper 22 at the smoke inlet 801, then enters the key exhaust flue 5 through the inlet end 51. From the key exhaust flue 5, smoke enters the first diversion chamber 6 via the seventh combined electric damper 18, then enters the flue 7 via the tenth combined electric damper 21, then enters the confluence chamber 4 via the second combined electric damper 13, then enters the axial flow fan 9 via the third combined electric damper 14, then enters the second diversion chamber 10 via the fourth combined electric damper 15, and finally exits outdoors through the exhaust shaft 11 via the fifth combined electric damper 16. In exhaust mode, the axial flow fan 9 is set to 1 in use and 1 in standby mode. In key exhaust mode, one fan and its corresponding damper are activated. The branch flue 52 can be equipped with multiple exhaust outlets at intervals, and the electric exhaust valves of the exhaust outlets are opened as needed.

Claims

1. A tunnel ceiling type air purification and key exhaust smoke intensive system operation method, The system comprises: Main line tunnel (8), smoke exhaust shaft (11), air purification system channel arranged in the main line tunnel; The air purification system channel is provided with a pre-filter (1), an electrostatic dust removal device (2), a gas adsorption device (3), and an axial flow fan (9) arranged in sequence from the head to the tail; and a key exhaust smoke passage (5) is further arranged; The air purification system channel (100) and the key exhaust smoke passage (5) are two closed channels arranged independently, the inlet end (51) of the key exhaust smoke passage is connected with branch smoke passages (52), each branch smoke passage is connected with the main line tunnel through a plurality of interval arranged smoke inlets (801) provided with electrically operated air valves; a first shunt conversion air chamber (6) is arranged in the smoke passage behind the inlet end of the key exhaust smoke passage, and is connected with the air purification system channel in front of the pre-filter (1) and the main line tunnel (8); a second shunt conversion air chamber (10) is arranged in the end of the air purification system channel behind the axial flow fan (9), and is connected with the smoke exhaust shaft (11) and the main line tunnel (8); a confluence conversion air chamber (4) is arranged in the air purification system channel between the gas adsorption device (3) and the axial flow fan (9); The first shunt conversion air chamber (6) comprises seventh, eighth, ninth and tenth combined electrically operated air valves; the first shunt conversion air chamber is connected with the key exhaust smoke passage on the front and back sides of the first shunt conversion air chamber through the seventh combined electrically operated air valve (18) and the tenth combined electrically operated air valve (21); the air purification system channel in front of the pre-filter (1) is connected through the eighth combined electrically operated air valve (19), and the main line tunnel (8) is connected through the ninth combined electrically operated air valve (20); The confluence conversion air chamber (4) comprises first, second and third combined electrically operated air valves; the confluence conversion air chamber (4) is connected with the air purification system channel at the tail of the gas adsorption device (3) through the first combined electrically operated air valve (12), is connected with the end of the key exhaust smoke passage behind the first shunt conversion air chamber through the second combined electrically operated air valve (13), and is connected with the air purification system channel in front of the axial flow fan (9) through the third combined electrically operated air valve (14); The second shunt conversion air chamber (10) comprises fourth, fifth and sixth combined electrically operated air valves; the second shunt conversion air chamber (10) is connected with the air purification system channel at the tail of the axial flow fan (9) through the fourth combined electrically operated air valve (15), is connected with the main line tunnel (8) through the sixth combined electrically operated air valve (17), and is connected with the smoke exhaust shaft (11) and is connected with the outlet end of the smoke exhaust shaft through the fifth combined electrically operated air valve (16); The axial flow fan (9) is provided with two fans, one of which is used and the other is standby. In the tunnel air purification mode, the seventh combined electric air valve (18), the tenth combined electric air valve (21), the second combined electric air valve (13), and the fifth combined electric air valve (16) are closed; the eighth combined electric air valve (19), the ninth combined electric air valve (20), the first combined electric air valve (12), the third combined electric air valve (14), the fourth combined electric air valve (15), and the sixth combined electric air valve (17) are opened. The system operates as follows: the polluted air in the main tunnel (8) enters the first shunt conversion air chamber (6) through the ninth combined electric air valve (20), enters the air purification air duct through the eighth combined electric air valve (19), and then passes through the pre-filter (1), the electrostatic dust removal device (2), and the gas adsorption device (3) in sequence, enters the confluence conversion air chamber (4) through the first combined electric air valve (12), enters the axial flow fan (9) through the third combined electric air valve (14), enters the second shunt conversion air chamber (10) through the fourth combined electric air valve (15), and the treated air is backfilled into the main tunnel (8) through the sixth combined electric air valve (17).

2. A method of operating a tunnel ceiling type air purification and focused smoke exhaust intensive system according to claim 1, characterized in that, The branch flue is one or two.

3. The method of operating a tunnel ceiling type air purification and focused smoke exhaust intensive system of claim 1 wherein, In the tunnel key smoke exhaust mode, the eighth combined electric air valve (19), the ninth combined electric air valve (20), the first combined electric air valve (12), and the sixth combined electric air valve (17) are closed, and the seventh combined electric air valve (18), the tenth combined electric air valve (21), the second combined electric air valve (13), the third combined electric air valve (14), the fourth combined electric air valve (15), and the fifth combined electric air valve (16) are opened. The system operates as follows: the smoke in the key smoke exhaust duct (5) enters the first shunt conversion air chamber (6) through the seventh combined electric air valve (18), enters the key smoke exhaust duct (5) through the tenth combined electric air valve (21), enters the confluence conversion air chamber (4) through the second combined electric air valve (13), enters the axial flow fan (9) through the third combined electric air valve (14), enters the second shunt conversion air chamber (10) through the fourth combined electric air valve (15), and enters the smoke exhaust shaft (11) through the fifth combined electric air valve (16) to be discharged from the outlet end of the smoke exhaust shaft.

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