Vibration and noise reduction power generation room of diesel generator for tunnel power utilization

Abstract

The vibration and noise reduction power generation chamber comprises a power generation chamber, a diesel generator set is installed in the power generation chamber, the side wall of the power generation chamber adopts a sound insulation plate cavity, the inner side of the sound insulation plate cavity is provided with a sound absorption sponge layer, the front side of the power generation chamber is provided with a door, and the top of the power generation chamber is of a herringbone top structure. A vibration reduction table is arranged on the ground of the power generation chamber, a mounting frame is fixedly connected to the vibration reduction table and connected to a mounting bottom plate through a rubber vibration damper, and the mounting bottom plate is fixedly connected with a rack arranged at the bottom of the diesel generator. According to the utility model, the decibel of noise is greatly reduced, the influence on nearby operators is avoided, the noise pollution is reduced, the vibration of equipment and the transmission of vibration noise can be greatly reduced by adopting the matched installation of the rubber vibration damper and the vibration damping table, and the service life of the equipment after vibration damping is also greatly prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of tunnel electrical equipment and relates to a vibration-reducing and noise-reducing power generation room of a diesel generator used for tunnel electricity. Background Art

[0002] In order to ensure that the electrical equipment in the tunnel can operate normally in the event of a power outage, especially in tunnels with large water inflow, a backup power supply is required. The backup power supply uses a 0.4KV low-voltage diesel generator. Due to the limitations of the power line diameter and power supply distance, the backup power low-voltage diesel generator must be moved into the tunnel to ensure that the voltage meets the needs of the electrical equipment; tunnels with large water inflows have multi-stage pumping stations, and the large power load will inevitably increase the number of generators put into use. Once the generator in the tunnel is put into operation due to a power outage, the exhaust gas in the tunnel will be seriously polluted, affecting the health of the construction workers in the tunnel, and even endangering their lives. In order to avoid exhaust gas pollution from the generator in the tunnel, high-voltage generators are used to generate electricity outside the tunnel.

[0003] The units using high-power diesel generators are arranged outside the cave. Due to the large amount of vibration and noise generated during operation, noise pollution is caused. In addition, the diesel generator units are placed in the power generation room, which is not convenient for heat dissipation. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a vibration-reducing and noise-reducing power generation room for a diesel generator used for tunnel electricity, which can achieve effective noise reduction, meet environmental protection requirements, improve the working site, and facilitate heat dissipation.

[0005] The technical solution adopted by the utility model is: a vibration-damping and noise-reducing power generation room for a diesel generator used for electricity in a tunnel, comprising a power generation room, a diesel generator set installed in the power generation room, a side wall of the power generation room adopts a sound insulation board cavity, the sound insulation board cavity is filled with a glass wool layer, the sound insulation board cavity is made of a sound insulation board, a sound-absorbing sponge layer is arranged on the inner side of the sound insulation board cavity, a door is arranged on the front side of the power generation room, the top is a gable roof structure, a vibration-damping platform is arranged on the ground of the power generation room, a mounting frame is fixedly connected to the vibration-damping platform, the mounting frame is connected to a mounting base plate through a rubber vibration damper, and the mounting base plate is fixedly connected to a frame arranged at the bottom of the diesel generator.

[0006] Furthermore, multiple air intake branch pipes are arranged on both sides of the power generation room, the multiple air intake branch pipes are connected to the cold air main pipe, the cold air main pipe is connected to the cold air fan, and the air inlet of the cold air fan is connected to the inclined shaft tunnel through a pipeline.

[0007] Furthermore, a silica gel dehumidification device is arranged at the air inlet of the above-mentioned air conditioning fan.

[0008] Furthermore, a spoiler fan is arranged at one air intake end of the air intake branch pipe, and the spoiler fan is rotatably connected to a support seat at the air intake port via a rotating shaft, and the rotating shaft passes through the support seat and is circumferentially fixedly connected with an unpowered blade.

[0009] Furthermore, a plurality of vibration-damping grooves are arranged in the vibration-damping platform, and steel balls of different sizes are placed in the vibration-damping grooves.

[0010] Furthermore, a muffler is installed at the smoke exhaust port of the above diesel generator, a high temperature resistant layer is arranged outside the muffler, and a sound insulation sponge layer is arranged outside the high temperature resistant layer.

[0011] The beneficial effects of the utility model are as follows: compared with the prior art, the utility model can process the generated dense smoke by connecting the branch pipes of each unit (electric valves are installed on the branch pipes) to the smoke exhaust pipe and the particle catcher, so as to obtain smoke exhaust that meets environmental protection requirements; the cold air fan draws the cold air from the cold air section of the inclined shaft tunnel, and then sends it into the power generation room where the diesel generator is installed to cool it. The cooling in the tunnel is relatively clean, similar to the use of cold air in the cave (temperature below 20 degrees), which can greatly reduce costs, arrange multiple cold air inlets, and have a better cooling effect; a smoke exhaust pipe is set on the top of the power generation room to control the exhaust gas generated by each diesel generator The concentrated discharge makes the equipment more compact and easier to connect to the exhaust pipe. The exhaust pipe and exhaust fan are set to discharge the hot air in the power generation room, which is also conducive to the entry of cold air. A mechanical automatic exhaust valve is set on the side where the exhaust pipe is connected to the exhaust pipe (a mechanical automatic exhaust valve for preventing backflow at the connection between the Siemens range hood exhaust pipe and the chimney), which automatically opens when the set pressure is reached. A silica gel dehumidification device is set at the air inlet of the cold air fan. The silica gel dehumidification device can also be set up with a serpentine channel. Moisture-absorbing silica gel particles are arranged in the serpentine channel to remove moisture from the extracted cooling, which is more conducive to the use of cold air in the power generation room and avoids the impact of excessive humidity on the equipment in the power generation room. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the primary circuit flow chart of the self-generated power and city power supply lines;

[0013] Figure 2 This is the primary system diagram of the tunnel inclined shaft low-voltage generator parallel generator boosting voltage;

[0014] Figure 3 It is a schematic diagram of the side structure of the power generation room;

[0015] Figure 4 This is a schematic diagram of the front structure of the power generation room;

[0016] Figure 5 is a schematic diagram of a side cross-sectional structure of a particle catcher;

[0017] Figure 6It is a schematic diagram of the front cross-sectional structure of the particle catcher;

[0018] Figure 7 It is a schematic diagram of the structure of a particle trap (spatial structure without adsorption structure);

[0019] Figure 8 This is a schematic diagram of the structure of the muffler installation. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Example 1: Figures 1 to 8 As shown, a vibration reduction and noise reduction power generation room of a diesel generator for tunnel electricity comprises a power generation room 2, in which a diesel generator set 1 is installed, a side wall 201 of the power generation room 2 adopts a sound insulation board cavity, the sound insulation board cavity is filled with a glass wool layer 202, the sound insulation board cavity is made of a sound insulation board, a sound absorbing sponge layer 203 is arranged on the inner side of the sound insulation board cavity, a door is arranged on the front side of the power generation room 2, the top is a gable roof structure, a vibration reduction platform 204 is arranged on the ground of the power generation room 2, a mounting frame 205 is fixedly connected to the vibration reduction platform 204, the mounting frame 205 is connected to a mounting base plate 207 through a rubber vibration damper 206, and the mounting base plate 207 is fixedly connected to a frame arranged at the bottom of the diesel generator, a multiple sound insulation structure is adopted to isolate the noise generated by the diesel generator, greatly reduce the decibel of the noise, avoid affecting nearby workers, reduce noise pollution, and adopt the coordinated installation of rubber vibration dampers and vibration reduction platforms. The equipment can greatly reduce the transmission of equipment vibration and vibration noise, and the service life of the equipment is greatly improved after vibration reduction. Because the generator sets are prone to mutual interference, the use of rubber vibration absorbers can isolate vibrations and prevent the vibrations generated by them from being transmitted to adjacent equipment, thereby reducing the probability of resonance. A plurality of vibration reduction grooves 208 are arranged in the vibration reduction platform 204. Steel balls of different sizes are placed in the vibration reduction grooves 208, which can greatly improve the vibration reduction effect. In addition, the vibration reduction platform can be set to raise the diesel generator, reduce the possibility of equipment being easily rusted and flooded due to excessive moisture caused by outdoor placement, and improve the safety of equipment installation. A muffler 209 is installed at the exhaust port of the diesel generator, a high-temperature resistant layer 210 is arranged outside the muffler, and a sound insulation sponge layer 211 is arranged outside the high-temperature resistant layer 210. This structure can further avoid the transmission of sound and reduce noise pollution.

[0022] A smoke exhaust pipe 3 is arranged outside the top of the power generation room 2, and the smoke exhaust pipe 3 is connected to the smoke exhaust port of each diesel generator through multiple branch pipes 4. The smoke exhaust pipe 3 is connected to the particle catcher 5, and an exhaust fan 6 is installed at the air outlet of the particle catcher 5. An exhaust pipe 7 is also arranged on the top of the power generation room 2, and the exhaust pipe 7 is connected to the smoke exhaust pipe 3 through an exhaust fan 8. Multiple air intake branch pipes 9 are arranged on both sides of the power generation room 2, and the multiple air intake branch pipes 9 are connected to the cold air main pipe 10, and the cold air main pipe 10 is connected to the cold air fan 11. The air inlet of the cold air fan 11 is connected to the inclined shaft tunnel through a pipeline. The cold air fan 11 draws cold air from the cold air section of the inclined shaft tunnel, and then sends it into the power generation room where the diesel generator is installed to cool it. The cooling in the tunnel is relatively clean, similar to the use of cold air in a cave (the temperature is below 20 degrees), which can greatly reduce Low cost, multiple cold air inlets are arranged, and the cooling effect is better; a smoke exhaust pipe is arranged on the top of the power generation room to collect and discharge the exhaust smoke generated by each diesel generator, the equipment is more compact, and it is easier to connect the smoke exhaust pipe. An exhaust pipe and an exhaust fan are arranged to discharge the hot air in the power generation room, which is also conducive to the entry of cold air. A mechanical automatic exhaust valve (a mechanical automatic exhaust valve for preventing backflow at the connection between the Siemens range hood exhaust pipe and the chimney) is arranged on the side where the exhaust pipe 7 is connected to the smoke exhaust pipe 3. It automatically opens when the set pressure is reached. A silica gel dehumidification device 15 is arranged at the air inlet of the cold air fan 11. The silica gel dehumidification device can also be provided with a serpentine channel. Moisture-absorbing silica gel particles are arranged in the serpentine channel to remove moisture from the extracted cooling, which is more conducive to the use of cold air in the power generation room and avoids the influence of excessive humidity on the equipment in the power generation room.

[0023] The purpose of the above improvement is: multiple diesel generators are used to form a diesel generator set 1. After the diesel unit is formed, more exhaust smoke is generated, the environmental pollution is more serious, and centralized emissions cannot meet environmental protection requirements. Therefore, it is necessary to treat the smoke emitted by it. Moreover, after the closed centralized exhaust, the heat dissipation performance of the diesel generator set deteriorates. Therefore, it is necessary to cool it while exhausting the smoke.

[0024] By connecting the branch pipes of each unit (electric valves are installed on the branch pipes) to the smoke exhaust pipe and the particle collector, the generated thick smoke can be processed to obtain smoke exhaust that meets environmental protection requirements.

[0025] In order to facilitate the cleaning of the particle trap, it is set to a detachable modular structure, that is, the particle trap 5 includes a shell 501, a DPF module 1 502 and a DPF module 2 503. The shell 501 is a three-dimensional structure, with an air inlet on the left and an air outlet on the top. The DPF module 1 502 and the DPF module 2 503 are staggered to form a serpentine filter channel. The DPF module 1 502 includes an upper fixed plate 504, an upper vertical plate 505 and a porous wall channel 1 506. 06, the upper fixing plate 504 is horizontally and detachably embedded in the upper side of the housing 501, the upper vertical plate 505 is made of multiple pieces, the upper end of which is fixedly connected to the bottom of the upper fixing plate 504, the porous wall channel 1 506 is arranged on the left side of each upper vertical plate 505 and covers the entire surface, the DPF module 2 503 includes a lower fixing plate 507, a lower vertical plate 508 and a porous wall channel 2 509, the lower fixing plate 507 is horizontally and detachably embedded in the lower side of the housing 501, the lower vertical plate 508 is made of Multiple pieces are used, the lower end of which is fixedly connected to the bottom of the lower fixed plate 507, the porous wall channel 2 509 is arranged on the left side of each lower vertical plate 508 and covers the entire surface, the porous wall channel 1 506 and the porous wall channel 2 509 are both located between the cavities formed by the adjacent lower vertical plates 508 and the upper vertical plates 505, a porous wall channel 2 509 is arranged between the leftmost lower vertical plate 508 and the housing 501, and the DPF module 1 502 and the DPF module 2 503 are embedded in the rear outer side. The cover plate 510 is detachably sealed and fixed, the air inlet end of the serpentine channel formed inside is connected to the air inlet, and the air outlet end is connected to the air outlet. The exhaust smoke of the diesel generator is filtered by the particle collector to achieve exhaust smoke treatment, reduce particle pollution, and meet environmental protection requirements. The serpentine structure is more conducive to filtering and adsorption, and the detachable module structure is convenient for cleaning after disassembly, which is convenient for recycling and reducing costs. The vibration-reducing exhaust fan produces negative pressure, improves the exhaust effect, and reduces the possibility of blockage.

[0026] Due to the principle that hot air rises and cold air sinks, if cold air is directly blown into the power generation room, the cooling effect is poor, and the air needs to be mixed and stirred. It is costly to directly install a stirring device. Therefore, an unpowered turbulence device is added, that is, a turbulence fan 12 is set at the air intake end of the above-mentioned air intake branch pipe 9. The turbulence fan 12 is rotatably connected to a support seat 13 at the air inlet through a rotating shaft. The support seat 13 is a frame structure, which reduces the resistance to air entry and makes the air intake smoother. After the rotating shaft passes through the support seat 13, an unpowered blade 14 is fixedly connected circumferentially. The unpowered blade will rotate under the drive of the intake air, and then drive the turbulence fan on the outside to disturb the air, thereby playing a role in mixing the hot air flow and the cold air flow in the power generation room. Moreover, blowing air around the oil production generator can also play a better cooling role.

[0027] Example 2: Figures 1 to 8As shown in the figure, the power load control method for a long inclined tunnel with a large slope is as follows:

[0028] When the city power is cut off, the microcomputer system of the intelligent high-voltage control cabinet receives the power outage signal, issues a command to disconnect the mains high-voltage cabinet incoming line circuit, and then closes the high-voltage control cabinet incoming line circuit after the diesel generator with electronic speed regulator is boosted; at the same time, the diesel generator parallel control cabinet receives the city power outage signal, and immediately issues a diesel generator self-start command to start multiple diesel generators to generate electricity (in two modes: automatic / manual start). When the unit is successfully started, power is sent to the generator parallel control cabinet. When paralleling is required, the synchronizer detects the signal, acts on the electric regulator, and automatically adjusts the frequency and phase of each diesel generator set to be consistent with the bus, issues a parallel signal, acts on the air switch to close and parallel, and after paralleling, uses the manual closing switch of the main circuit to boost the power generated by the parallel machine through the booster and transmit 10KV high voltage electricity to the tunnel;

[0029] When the mains power comes in, the microcomputer system of the intelligent high-voltage control cabinet receives the mains power signal and issues a command to disconnect the high-voltage control cabinet incoming line circuit for the generator boost, and then closes the mains power high-voltage cabinet incoming line circuit. The mains power directly provides electricity for the tunnel. At the same time, the diesel generator parallel control cabinet receives the mains power signal and immediately issues a command to stop the diesel generator, so that multiple diesel generators stop running (in two modes: automatic / manual start), and the electrician disconnects the disconnect switch of the main circuit of the generator parallel control cabinet.

[0030] 1. Construction Preparation

[0031] 1.1. Selection of substation equipment

[0032] Tunnel Inclined Shaft Emergency Power Generation Support Center Power Equipment Selection Table

[0033] Serial number name model unit quantity Remark 1 dynamo 500KW tower 8 Jiangsu Yingtai, 1 spare 2 transformer S11-3150 / 10-0.4 tower 1 3 transformer S11-1000 / 10-0.4 tower 2 4 transformer S11-630 / 10-0.4 tower 2 5 High voltage distribution cabinet 10KV set 1 6 Low voltage distribution cabinet 1000GGD set 1 7 Low voltage distribution cabinet 630GGD set 1 8 Busbar 120×8 rice 92 9 Vacuum circuit breaker 630A tower 5 10 High voltage cable ZR-YJV22-10kV-3*95 rice 1900 11 Terminal connector 10KV set 4 12 Terminal connector 10KV set 4 13 Grounding device set 5 14 Supplementary Materials several

[0034] 1.2. Site selection

[0035] One site is 30m long and 8m wide, and the other site is 6m long and 8m wide. The site is required to be flat and hardened, with a ceiling covered with colored steel tiles and ventilation on all sides.

[0036] 1.3 Equipment assembly

[0037] 8 generators are installed on the left side of the inclined shaft tunnel entrance. After being connected to the grid, they are introduced into the S11-3150 / -0.4 transformer through the busbar, and then introduced into the 10KV high-voltage distribution cabinet by the transformer. At the same time, the 10kv external power is also introduced into the high-voltage distribution cabinet, and the high-voltage distribution cabinet uses ZR-YJV22-10kV-3*150mm 2The high-voltage cable is introduced into the tunnel, and a S11-1000 / -0.4 transformer is installed at the first-level pump room in the tunnel, a S11-1000 / -0.4 transformer is installed at the second-level pump room, and a S11-1000 / -0.4 transformer is installed at the third-level pump room; while increasing the transformer as needed according to the load in the tunnel, the corresponding generator and grid-connected sub-cabinet are added outside the tunnel, and the voltage is transformed to 0.4KV by the transformer in the tunnel to supply power to the pumping equipment.

[0038] 2 Construction sequence

[0039] Determined according to the load of pumping equipment in the tunnel → generator selection and verification → busbar selection and verification → 0.4KV to 10KV transformer selection and verification → 10kV high-voltage line introduced into the distribution room → high-voltage cable laid into the cave → install a 1000KVA transformer in the first-level pump station, and a 1000KVA transformer in the second-level pump station, and the same for the third level → introduce 0.4KV distribution cabinet from the transformer in the tunnel → install transformer grounding system → install relay protection device and control → improve safety protection on site → put into production operation.

[0040] Among them, the transformer selection is as shown in Table 1;

[0041] Table 1 Power table of pumping machinery for inclined shaft in tunnel

[0042]

[0043]

[0044] From the statistical table, we can see that the rated power of the motor in the entire cave (KW): ΣP1 = 3036KW: The capacity of the lighting equipment in the entire cave (KW): ΣP2 = 10KW.

[0045]

[0046] According to the load calculation, the circuit capacity loss and the simultaneous power consumption coefficient should be considered when determining the power consumption. P is the total power consumption in the cave (KVA); P1 is the rated power of the motor in the entire cave (KW); P2 is the rated power of the welding machine in the entire cave (KVA); P3 is the capacity of the lighting equipment in the entire cave (KW); K is the standby coefficient, 1.05-1.10, take 1.05; The average power factor of the motor (the highest is 0.75–0.78 at the construction site, and generally 0.65-0.75) is taken as 0.75; K1, K2 and K3 are the required coefficients, as shown in Table 2.

[0047] Table 2 requires coefficient K value

[0048]

[0049] According to the situation of on-site electrical equipment, K1 is 0.6 and K2 is 0.9.

[0050] According to the above estimation formula, the total power consumption in the tunnel inclined shaft is:

[0051] P=1.05(0.6*3038 / 0.75+0.9*10)=2439

[0052] The capacity of the transformer in the tunnel is determined based on the estimated total construction power consumption. The capacity of the transformer should be equal to or slightly greater than the total construction power consumption. During use, it is generally best to make the power load borne by the transformer reach about 80% of the rated capacity.

[0053] The capacity of the transformer is

[0054] Where, P 变 is the capacity of the transformer (KVA);

[0055] Then P 变 =1.3P=3170KVA

[0056] According to the above calculations, one SZ11-3150 / -0.4 transformer is selected from the transformer product catalog for both the inside and outside of the tunnel inclined shaft. It is used to boost the voltage from 0.4KV to 10KV and is installed in the distribution room on the left side of the tunnel inclined shaft entrance, 50 meters away from the entrance.

[0057] Selection of high voltage cables

[0058] The cross-section of high-voltage cables is generally selected according to the economic current density, and then the long-term allowable current, voltage loss and mechanical strength are used to test whether the selected cross-section is reasonable.

[0059] 1) Select the cable cross section according to the economic current density. According to the maximum annual load utilization hours of the high-voltage cable line and the cable core material, find out the economic current density J (based on the current electricity unit price and material price analysis), as shown in Table 3. Then calculate the long-term maximum load current I during normal operation. max .

[0060] Table 3 Economic current density table A / mm 2

[0061]

[0062]

[0063] According to the capacity and voltage of the transformer, the maximum current I on the high voltage side of the transformer max =P 变 / U / 1.732, where Imax is the maximum current on the high-voltage side of the transformer (A); P is the transformer capacity (kVA); U is the high-voltage voltage; then I max =3036kVA / 10kV / 1.732=175A.

[0064] Safety management must be done for high voltage tunneling. Considering that armored cables can enhance cable strength and prevent mechanical damage, armored cables can be directly buried without special cable trenches during construction, or can be directly laid along the wall. Considering the comprehensive economic conditions and construction angles, 3*150mm is selected according to the economic current density in Table 4. 2 Copper core armored cable.

[0065] 2) Check the cable cross section according to the long-term allowable current. The current carrying capacity of the cable refers to the maximum current allowed to pass through the cable conductor at the highest allowable temperature. When selecting the cable, it is necessary to ensure that the heat generated by the loss of each part of the cable does not cause the cable temperature to exceed its maximum allowable temperature. According to the standard cross section selected according to the economic current density, as shown in Table 4, find out its long-term allowable current I y , should not be less than the long-term maximum load current / I max , that is, K c I y ≥I max (K c is the current-carrying capacity correction coefficient under different design conditions).

[0066] Table 4 10kV three-core power cable allowable current table A

[0067]

[0068] Note: Applicable to aluminum core cables. The allowable continuous current interception value of copper core cables can be multiplied by 1.29.

[0069] According to the design specifications for power engineering cables, the allowable current interception table for 10kV three-core power cables is shown in Table 4; the high-voltage cable for entering the tunnel is 150mm 2 The copper core armored cable is laid along the wall. The conductor is set at a maximum temperature of 90°C. The ambient temperature in the tunnel is the average of the highest daily temperature in the hottest month plus 5°C. The ambient temperature in the tunnel is 30°C. It can be seen from the table that 150mm 2 The long-term allowable current I of the copper core cable y It is 175A*1.29=225.7A, as shown in Table 5. The cable is laid along the wall in the tunnel. The conductor is at a maximum temperature of 90℃ and the ambient temperature in the tunnel is 30℃. The current-carrying correction coefficient K of the cable at different ambient temperatures is 1.09.

[0070] Table 5 Current-carrying capacity correction coefficients for cables up to 35 kV at different ambient temperatures

[0071]

[0072] Then KI y =1.09*276.1=246>I max =175A, the selected cable cross-section meets the requirements.

[0073] Due to the poor construction environment in the tunnel, the tunnel is humid, and vehicles are moving in the tunnel, the cable model is selected as ZR-YJV22-10Kv-3*150mm according to the actual situation in the tunnel and the load in the tunnel to reduce the power loss. 2 (Copper core cross-linked polyethylene insulated fine steel wire armored PVC sheathed power cable), the cable length is 1900m.

[0074] 3. Generator selection

[0075] The load of the pumping equipment in the inclined shaft of the tunnel is 3036KW. Nine 500KWA generators (1 spare) are selected, 8×500=4000KWA. According to the actual power generation capacity of 0.85 of the generator, 4000×0.85=3400KWA>3036KW. The selected generator meets the power supply requirements of the pumping equipment in the tunnel.

[0076] 4. Key points for parallel generator control cabinet parallel power generation and intelligent high-voltage control cabinet power transmission operation

[0077] 1. Key points for parallel operation of low-voltage diesel generators

[0078] Before starting the low-voltage diesel generator:

[0079] 1) Check the engine oil level, coolant level, fuel level, and check and eliminate the "three leaks" of the engine.

[0080] 2) Check whether the electrical circuit connection is reliable and whether there are any hidden dangers of leakage or short circuit such as broken skin and short circuit.

[0081] 3) Check whether the circuit breaker closing and opening handle is in the open state and whether the battery cable connection is correct and reliable.

[0082] 4) Check and clean the unit and cooling fan to ensure there are no foreign objects around them, and no flammable objects around the exhaust system.

[0083] 5) If the unit is started for the first time or restarted after a long period of inactivity, the air in the fuel system should be exhausted first.

[0084] Low voltage diesel generator start-up (automatic operation steps):

[0085] 1) Press the "AUTO" key, and when the remote start (with load) input is valid, enter the "Start Delay" mode.

[0086] 2) The generator set status page displays the countdown for “Start-up Delay”.

[0087] 3) After the start-up delay ends, the generator set status page displays "Preheating delay XX".

[0088] 4) After preheating and starting, the frequency and phase of each generator set are automatically adjusted to be consistent with the bus when it starts generating electricity, and a parallel signal is issued. The air switch is automatically closed and the machine is paralleled. The closing switch of the main circuit is manually closed and the generator is powered.

[0089] Starting a low-voltage diesel generator (manual operation steps):

[0090] 1) Press the "MANUAL" key, the controller enters the "manual mode", and the manual mode indicator light turns on.

[0091] Press the "START" button to start the generator set, automatically judge the start-up success, and automatically increase the speed to high speed operation. When the diesel generator set encounters high water temperature, low oil pressure, overspeed, abnormal voltage, etc. during operation, it can effectively and quickly protect the shutdown.

[0092] 2) Manual shutdown: Press the "STOP" button to shut down the running generator set.

[0093] 3) Depending on the situation, the generator parallel control cabinet has a "main / standby" selection gear. When the rotary switch points to the "main" gear, the first unit will be started first, and the standby unit will be started with a delay. When the rotary switch points to the "standby" gear, the unit will be started first and the standby unit will be started with a delay.

[0094] Low voltage diesel generator in operation:

[0095] 1) After starting the unit, check whether the unit operating parameters such as oil pressure, cooling water temperature, frequency, voltage, etc. are normal, and check whether the oil level is within the specified scale range. If not, add oil in time.

[0096] 2) Check the fuel, oil, coolant, intake and exhaust systems for leaks, the generator for heat, smoke, burnt smell, and abnormal sounds, and handle them in a timely manner.

[0097] 3) The unit should run at no-load for about 5 minutes at rated speed. After checking that there are no abnormal conditions, the switch can be closed to supply power to the load. When the ambient temperature is low, it is necessary to warm up the unit at no load. After the water temperature rises to 50-60℃, the switch can be closed to supply power. Overloading is strictly prohibited.

[0098] 4) Check whether there is any looseness or abnormal vibration at each connection point of the unit, and deal with it in time.

[0099] 5) When the unit is running, there must be a dedicated person on duty to record the operating parameters and ambient temperature every 15 to 30 minutes.

[0100] 6) During continuous operation, check the oil level every 8 hours.

[0101] Low voltage diesel generator shutdown

[0102] 1) Before shutting down, the unit must be completely unloaded, disconnected, and run at no load for about 5 minutes. Turn the control key to the "0" position to shut down the unit.

[0103] 2) When the automation system is in manual mode, press the stop button to stop the unit.

[0104] 3) When the automation system is in automatic state, after the mains power is restored, the ATS-1600 / 4P dual power automatic switch is switched from the power generation position to the mains power input position, the unit stops after a speed reduction delay, and finally enters the standby state until the mains power fails again. (If you need to stop, you can also press the stop button to stop, but you need to unload and open the switch first.)

[0105] Emergency shutdown of low voltage diesel generator

[0106] 1) When the following abnormal conditions occur, emergency shutdown can be quickly taken: a. The oil pressure suddenly drops to 1.5 kg / cm 2 a. The unit does not automatically shut down because the temperature rises sharply to over 100℃ within 5 minutes; c. The oil pipe breaks, oil sprays, etc.; d. There are obvious dangers of fire, electric shock, explosion, etc. on site, the unit runs extremely unsteadily, and the smoke exhaust is abnormal; e. The unit makes abnormal noises (such as knocking sounds).

[0107] 2) Press the emergency stop button and the unit will stop immediately (the automation system has this function).

[0108] 3) If the automation system needs to be restarted after pressing the emergency stop button or after a fault, it must be restarted after the fault is eliminated. Before restarting, press the reset button (stop button) and then press the manual or automatic reduction button to enter the normal operation of the system.

[0109] 2. Key points for power transmission operation of intelligent high-voltage control cabinet

[0110] The control circuit of the generator self-generating boost main line is interlocked with the control circuit of the main power line to ensure safe power supply. If one circuit is closed, the other circuit must be disconnected. The operation process of stopping power supply of the two power supply main lines is the same, as follows:

[0111] Power transmission operation procedures:

[0112] 1) Close the front and rear doors of the high-voltage control system and check whether the isolating switch and circuit breaker are in the open position;

[0113] 2) Insert the operating rod into the operating mechanism of the isolating switch, and press the lock position with your hand at the same time (the white arrow is unlocked) to turn the mechanism clockwise to the closed position, and confirm that the isolating switch is in the closed position, then pull out the operating rod;

[0114] 3) Manually press the closing button on the instrument door (when abnormal, you can operate the manual mechanical closing button on the circuit breaker panel), the circuit breaker is closed, the corresponding position is displayed as closed, the red light is on (closing indication), and the power supply is completed. (Note: The circuit breaker can only be closed when the isolating switch is in the closed position)

[0115] Power outage operating procedures

[0116] 1) Contrary to power transmission, manually press the opening button on the instrument door (when abnormal, the manual mechanical opening button on the circuit breaker panel can be operated), the circuit breaker is in the opening position, and check that there is a green light on the circuit breaker panel (opening indication), confirm that the circuit breaker indicates the opening position;

[0117] 2) Insert the operating lever into the operating mechanism of the isolating switch and press the lock position at the same time (white arrow to unlock) before turning the mechanism counterclockwise to the open position. Make sure the isolating switch is in the open position and pull out the operating lever to complete the power outage.

[0118] In order to ensure that the two main lines of the mains power supply and the generator power generation and boosting are not connected, an intelligent high-voltage control cabinet is installed on the two lines to realize the line switch interlocking, and a high-voltage isolating switch is installed to ensure the safety of the control cabinet during maintenance. To prevent the high-voltage control cabinet from dripping with water due to humid air and causing leakage accidents, the mains cabinet, generator power generation and boosting control cabinet, and high-voltage cable paralleling cabinet of the high-voltage control cabinet are all equipped with heaters for dehumidification.

[0119] Benefit Analysis:

[0120] In tunnels with long excavation footage, large water inflow, and high reverse slope pumping head, it is necessary to establish multi-stage pumping stations for staged pumping. Under the condition of high power concentration point of tunnel power load, the low-voltage diesel generator parallel power generation boost power supply outside the tunnel is compared with the high-voltage generator power supply outside the tunnel and the generator placed inside the tunnel. The low-voltage diesel generator parallel power generation boost power supply has the following advantages:

[0121] 1) Low-voltage diesel generators are connected outside the cave and use boosting technology to generate power. The power is guaranteed and the power generation speed is fast. When the city power is cut off, the required number of generators can be quickly started according to the total power load and there are backup generators. Once a generator fails, the backup generator can be started to supply power to ensure timely power supply;

[0122] 2) Compared with high-voltage generators, the low-voltage diesel generator offline parallel power generation and boosting technology has lower procurement costs, higher utilization rates of low-voltage diesel generators, less investment in insulation level protection for distribution cabinets, and higher safety assurance.

[0123] 3) Compared with the generator in the tunnel, the low-voltage diesel generator can generate power in parallel outside the tunnel, which can save labor costs, centrally control equipment, and reduce the labor intensity of personnel. With the increase of excavation depth in tunnels with large water inflow, the number of pump station designs is increasing, and the operation and inspection of the generator in the tunnel requires more than 2 people, while the low-voltage diesel generator can generate power in parallel outside the tunnel with only 1 electrician for operation and monitoring;

[0124] 4) Low-voltage diesel generators are paralleled outside the tunnel to generate power and boost the voltage. Low-voltage diesel generators are paralleled outside the tunnel to generate power and boost the voltage. This reduces the number of standby generators, reduces equipment procurement costs, eliminates various adverse factors caused by air pollution caused by generator exhaust emissions, improves the construction environment in the tunnel, and reduces the investment cost of ventilation equipment. Due to the exhaust gas of construction equipment in the tunnel, the maintenance cycle of the generator needs to be shortened, while parallel generation outside the tunnel allows equipment maintenance to be carried out during the normal installation cycle, saving the project's economic cost.

[0125] In summary, the effects of the above control method are as follows:

[0126] 1) Centralized control of generators and quick commissioning of spontaneous power supply

[0127] The generators placed in the tunnel are placed near different power-consuming equipment according to the power load. Once the city power is cut off, relevant staff need to go to different locations to start the generators. The dispersion of the generators greatly increases the start-up time and power supply time of the generators. The failure of the generators placed in the tunnel cannot be solved in the short term, and must be deployed from other places, which greatly prolongs the power supply recovery time. Use multiple generators to generate electricity in parallel, and concentrate all the generators in the distribution room built in the open area outside the tunnel. Electricians and generator maintenance personnel jointly ensure the operation of the equipment, realize the centralized management of generators, and appropriately configure standby generators according to the load. Once a generator in operation fails, part of the load is reduced, and the standby generator is quickly put into power generation through the control system, which greatly improves the delivery speed of the standby power supply when the city power is cut off. When the power load changes, the number of running units can be increased or decreased according to the load rate. When the load rate is lower than 50%, the unit will be decoupled, and when the load rate is higher than 80%, the parallel unit will be started to make the unit run in the most economical and fuel-saving state.

[0128] 2) Reduce equipment use costs and labor costs, and reduce equipment exhaust pollution

[0129] Tunnels with long excavation footage, large water inflow, and large reverse slope pumping lift require the establishment of multi-stage pumping stations for graded pumping, which results in many concentrated points of electricity load in the tunnel. To meet the electricity load demand, some large-load pumping stations must be equipped with 2 to 3 generators of more than 400KW. Generators must be placed in the comprehensive caverns excavated on the side walls of the tunnel to reduce the impact on construction and transportation, which increases the cost of excavation support. In addition, the load carried by each generator is limited, and the load must be reasonably distributed, which increases the related costs of low-voltage power distribution in the tunnel. In order to ensure the operation of the generator, more than 2 staff members must be arranged to inspect the operation of the generator. The number of equipment operations must be adjusted through communication between the generator operator and the pump station operator, which increases the labor intensity and labor costs of the staff. When 2 to 3 generators of the same level pumping station generate electricity at the same time, the relevant staff fail to communicate and inspect properly, and fail to start and stop the generators according to the actual load, which increases the equipment operation cost; there is also a situation where the groundwater flow decreases, and a generator only carries a small part of the load pumping equipment, and other generators run at full load, but the generator with a small load cannot be turned off. Once turned off, the drainage volume cannot meet the requirements, which also increases the equipment operation cost. When a failure occurs during equipment operation and cannot be solved, a spare generator needs to be dispatched to replace it, which increases the transfer cost. The generator is placed in the tunnel, and the exhaust pollution of the generator seriously affects the health of the construction workers in the tunnel. In order to improve the air conditions in the tunnel, it is necessary to increase the investment in ventilation equipment, which also accelerates the maintenance cycle of the generator and increases the equipment procurement cost and maintenance cost.

[0130] Multiple generators are connected in parallel to generate electricity through a booster, and the original high-voltage line of the city power entering the tunnel is used for power supply. The transformers in the tunnel step down the voltage to supply each load. The low-voltage line and protection control system of the power load only need to be set up according to the load, and are not affected by the power supply demand relationship between a single generator and the load, which increases the material cost of the low-voltage line and protection control system, saving the material cost of the low-voltage power supply system. The generators are concentrated in the power distribution room outside the tunnel, and one electrician can operate and monitor the operation of the equipment through an intelligent controller, reducing the work intensity and labor costs of the electrician. Electricians and pump station managers communicate with each other in advance, and can flexibly increase or reduce the number of parallel generators according to changes in load, which enhances the mobility of the generator use and makes the operating cost of the generator much lower than the situation where a single generator enters the tunnel and operates to generate electricity and drive the load. The use of multiple generators in parallel outside the tunnel to generate electricity reduces the related costs of excavating a comprehensive cavern in the tunnel, facilitating tunnel construction and transportation; it avoids the impact of exhaust emissions on construction personnel in the tunnel (especially pump station managers). At the same time, the generators can also be maintained according to normal cycles without worrying about the generator maintenance cycle having to be shortened and the maintenance cost increasing due to the exhaust emissions from the generators themselves in the tunnel.

[0131] 3) Improved generator maintenance space, operation and power safety

[0132] The generator is placed in the tunnel for power generation. The construction environment in the tunnel with heavy water inflow is humid. Once a power outage occurs, electricians must implement generator closing and switching operations at various pumping stations in the tunnel, which will inevitably increase the possibility of leakage and bring certain safety hazards to the generator operators. At the same time, due to space limitations in the tunnel, it is not convenient to carry out generator maintenance work in the tunnel.

[0133] The generator parallel power generation center is located outside the tunnel, and the generator power supply operation is carried out in the distribution room. The distribution room is drier than the tunnel, and the insulation protection is easier to implement than in the tunnel, which strengthens the safety of electrician operating equipment and provides ample space for the repair and maintenance of the generator. In order to achieve rapid and safe power supply by using the high-voltage cable of the mains power entering the tunnel after the generator parallel power generation is boosted by the booster, an intelligent high-voltage control cabinet is installed to realize the interlocking of the mains power high-voltage incoming line control circuit and the high-voltage control circuit after the spontaneous boost through the intelligent microcomputer system, so that the two incoming line circuits cannot be closed at the same time to ensure the power supply line The safety of electricity.

[0134] In summary: 1. The use of the above control method saves equipment use fees and labor costs, creates (direct) economic benefits of 1 million yuan, and has significant economic benefits. 2. By setting up an emergency power generation guarantee center outside the tunnel, centralized management of construction electricity in the tunnel is carried out, and rapid conversion and safety interlocking of city power and self-generated power are achieved, ensuring the safety, quality, and construction period of tunnel construction, with significant social benefits. 3. It overcomes the problems of internal combustion engine exhaust pollution, inconvenient maintenance and operation, and major safety hazards of electricity use after the generator enters the tunnel, and has significant energy-saving and environmental protection benefits. The above control method is suitable for long tunnels or mines with long power supply distances and large power loads, especially mountainous areas with unstable city power, tunnels or mines with large water inflow and graded design of pumping stations.

[0135] A plurality of diesel generators are used to form a diesel generator set 1. After the diesel generator set is formed, more exhaust smoke is generated, and the environmental pollution is more serious. Centralized emission cannot meet environmental protection requirements. Therefore, it is necessary to treat the smoke emitted by it, and after the closed centralized exhaust, the heat dissipation performance of the diesel generator set becomes poor. Therefore, it is necessary to cool it while exhausting the smoke. The specific solution is: the diesel generator set 1 is installed in the power generation room 2, and a smoke exhaust pipe 3 is arranged outside the top of the power generation room 2. The smoke exhaust pipe 3 is connected to the exhaust port of each diesel generator through a plurality of branch pipes 4. The smoke exhaust pipe 3 is connected to the particle catcher 5. The air outlet of the particle catcher 5 is installed with an exhaust fan 6. An exhaust pipe 7 is also arranged on the top of the power generation room 2. The exhaust pipe 7 is connected to the exhaust pipe 3 through an exhaust fan 8. A plurality of air intake branch pipes 9 are arranged on both sides of the power generation room 2. The plurality of air intake branch pipes 9 are connected to the cooling main pipe 10. The cooling main pipe 10 is connected to the cooling fan 11. The air inlet of the cooling fan 11 is connected to the inclined In the shaft tunnel, the cooling fan 11 draws cold air from the cold air section of the inclined shaft tunnel, and then sends it into the power generation room where the diesel generator is installed to cool it. The cooling in the tunnel is relatively clean, similar to the use of cold air in a cave (temperature below 20 degrees), which can greatly reduce costs. By arranging multiple cooling air inlets, the cooling effect is better; an exhaust pipe is arranged on the top of the power generation room to collect and discharge the exhaust smoke generated by each diesel generator. The equipment is more compact and easier to connect the exhaust pipe. An exhaust pipe and an exhaust fan are arranged to discharge the hot air in the power generation room, which is also conducive to the entry of cold air. A mechanical automatic exhaust valve is arranged on one side of the exhaust pipe 7 connected to the exhaust pipe 3, which automatically opens when the set pressure is reached. A silica gel dehumidification device 15 is arranged at the air inlet of the cooling fan 11. The silica gel dehumidification device can also be provided with a serpentine channel. Moisture-absorbing silica gel particles are arranged in the serpentine channel to remove moisture from the extracted cooling, which is more conducive to the use of cold air in the power generation room and avoids the impact of excessive humidity on the equipment in the power generation room.

[0136] After a high-power diesel generator is started, it will make a lot of noise and vibrate. If it is not installed properly, it will have a great impact on the service life of the equipment. Therefore, it is particularly important to reduce the vibration of the generator during installation and to soundproof the power generation room. That is, the side wall 201 of the power generation room 2 adopts a soundproof board cavity, and the soundproof board cavity is filled with a glass wool layer 202. The soundproof board cavity is made of a soundproof board, and a sound-absorbing sponge layer 203 is arranged on the inner side of the soundproof board cavity. A door is arranged on the front side of the power generation room 2, and the top is a gable roof structure. A vibration reduction platform 204 is arranged on the ground of the power generation room 2, and a mounting frame 205 is fixedly connected to the vibration reduction platform 204. The mounting frame 205 is connected to the mounting base plate 207 through a rubber vibration damper 206. The mounting base plate 207 is fixedly connected to the frame arranged at the bottom of the diesel generator. A multiple sound insulation structure is adopted to isolate the noise generated by the diesel generator, greatly reduce the decibel of the noise, avoid affecting nearby workers, and reduce noise pollution. The coordinated installation of rubber vibration dampers and vibration damping platforms can greatly reduce the transmission of equipment vibration and vibration noise, and the service life of the equipment is also greatly improved after vibration damping. Because generator sets are prone to mutual interference, the use of rubber vibration dampers can isolate vibrations and prevent the vibrations generated by them from being transmitted to adjacent equipment, thereby reducing the probability of resonance. The vibration damping platform 204 is provided with a plurality of vibration damping grooves 208, and steel balls of different sizes are placed in the vibration damping grooves 208, which can greatly improve the vibration damping effect. In addition, the vibration damping platform can be set up to raise the diesel generator, reduce the possibility of equipment being easily rusted and flooded due to excessive moisture caused by outdoor placement, and improve the safety of equipment installation. The exhaust port of the diesel generator is installed with a muffler 209, and a high-temperature resistant layer 210 is arranged outside the muffler, and a sound insulation sponge layer 211 is arranged outside the high-temperature resistant layer 210. This structure can further avoid the transmission of sound and reduce noise pollution.

[0137] In order to facilitate the cleaning of the particle trap, it is set to a detachable modular structure, that is, the particle trap 5 includes a shell 501, a DPF module 1 502 and a DPF module 2 503. The shell 501 is a three-dimensional structure, with an air inlet on the left and an air outlet on the top. The DPF module 1 502 and the DPF module 2 503 are staggered to form a serpentine filter channel. The DPF module 1 502 includes an upper fixed plate 504, an upper vertical plate 505 and a porous wall channel 1 506. 06, the upper fixing plate 504 is horizontally and detachably embedded in the upper side of the housing 501, the upper vertical plate 505 is made of multiple pieces, the upper end of which is fixedly connected to the bottom of the upper fixing plate 504, the porous wall channel 1 506 is arranged on the left side of each upper vertical plate 505 and covers the entire surface, the DPF module 2 503 includes a lower fixing plate 507, a lower vertical plate 508 and a porous wall channel 2 509, the lower fixing plate 507 is horizontally and detachably embedded in the lower side of the housing 501, the lower vertical plate 508 is made of Multiple pieces are used, the lower end of which is fixedly connected to the bottom of the lower fixed plate 507, the porous wall channel 2 509 is arranged on the left side of each lower vertical plate 508 and covers the entire surface, the porous wall channel 1 506 and the porous wall channel 2 509 are both located between the cavities formed by the adjacent lower vertical plates 508 and the upper vertical plates 505, a porous wall channel 2 509 is arranged between the leftmost lower vertical plate 508 and the housing 501, and the DPF module 1 502 and the DPF module 2 503 are embedded in the rear outer side. The cover plate 510 is detachably sealed and fixed, the air inlet end of the serpentine channel formed inside is connected to the air inlet, and the air outlet end is connected to the air outlet. The exhaust smoke of the diesel generator is filtered by the particle collector to achieve exhaust smoke treatment, reduce particle pollution, and meet environmental protection requirements. The serpentine structure is more conducive to filtering and adsorption, and the detachable module structure is convenient for cleaning after disassembly, which is convenient for recycling and reducing costs. The vibration-reducing exhaust fan produces negative pressure, improves the exhaust effect, and reduces the possibility of blockage.

[0138] Due to the principle that hot air rises and cold air sinks, if cold air is directly blown into the power generation room, the cooling effect is poor, and the air needs to be mixed and stirred. It is costly to directly install a stirring device. Therefore, an unpowered turbulence device is added, that is, a turbulence fan 12 is set at the air intake end of the above-mentioned air intake branch pipe 9. The turbulence fan 12 is rotatably connected to a support seat 13 at the air inlet through a rotating shaft. The support seat 13 is a frame structure, which reduces the resistance to air entry and makes the air intake smoother. After the rotating shaft passes through the support seat 13, an unpowered blade 14 is fixedly connected circumferentially. The unpowered blade will rotate under the drive of the intake air, and then drive the turbulence fan on the outside to disturb the air, thereby playing a role in mixing the hot air flow and the cold air flow in the power generation room. Moreover, blowing air around the oil production generator can also play a better cooling role.

[0139] The above description is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present utility model, which should be included in the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims

1. A vibration and noise reduction power generation room for a diesel generator used for tunnel electricity, characterized by: The invention comprises a power generation room (2), wherein a diesel generator set (1) is installed in the power generation room (2), a side wall (201) of the power generation room (2) adopts a sound insulation board cavity, the sound insulation board cavity is filled with a glass wool layer (202), the sound insulation board cavity is made of a sound insulation board, a sound absorbing sponge layer (203) is arranged on the inner side of the sound insulation board cavity, a door is arranged on the front side of the power generation room (2), the top is a gable roof structure, a vibration reduction platform (204) is arranged on the ground of the power generation room (2), a mounting frame (205) is fixedly connected to the vibration reduction platform (204), the mounting frame (205) is connected to a mounting base plate (207) via a rubber vibration damper (206), and the mounting base plate (207) is fixedly connected to a frame arranged at the bottom of the diesel generator.

2. The vibration and noise reduction power generation room of a diesel generator for tunnel electricity according to claim 1, characterized in that: A plurality of air intake branch pipes (9) are arranged on both sides of the power generation room (2); the plurality of air intake branch pipes (9) are connected to a cooling air main pipe (10); the cooling air main pipe (10) is connected to a cooling air fan (11); and an air intake of the cooling air fan (11) is connected to the inclined shaft tunnel via a pipeline.

3. The vibration and noise reduction power generation room of a diesel generator for tunnel electricity according to claim 1, characterized in that: A silica gel dehumidification device (15) is provided at the air inlet of the cooling air fan (11).

4. The vibration and noise reduction power generation room of a diesel generator for tunnel electricity according to claim 2, characterized in that: A turbulent fan (12) is provided at one air intake end of the air intake branch pipe (9), and the turbulent fan (12) is rotatably connected to a support seat (13) at the air intake port via a rotating shaft, and the rotating shaft passes through the support seat (13) and is circumferentially fixedly connected to an unpowered blade (14).

5. The vibration and noise reduction power generation room of a diesel generator for tunnel electricity according to claim 1, characterized in that: A plurality of vibration-damping grooves (208) are arranged in the vibration-damping platform (204), and steel balls of different sizes are placed in the vibration-damping grooves (208).

6. The vibration and noise reduction power generation room of a diesel generator for tunnel electricity according to claim 1, characterized in that: A muffler (209) is installed at the smoke exhaust port of the diesel generator, a high temperature resistant layer (210) is arranged outside the muffler, and a sound insulation sponge layer (211) is arranged outside the high temperature resistant layer (210).

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