CN112729841B - Multi-station engine test bed exhaust device - Google Patents
Multi-station engine test bed exhaust device Download PDFInfo
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- CN112729841B CN112729841B CN202011572226.0A CN202011572226A CN112729841B CN 112729841 B CN112729841 B CN 112729841B CN 202011572226 A CN202011572226 A CN 202011572226A CN 112729841 B CN112729841 B CN 112729841B
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- 238000012360 testing method Methods 0.000 title claims abstract description 82
- 230000030279 gene silencing Effects 0.000 claims abstract description 39
- 238000000926 separation method Methods 0.000 claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 71
- 238000001179 sorption measurement Methods 0.000 claims description 24
- 239000007921 spray Substances 0.000 claims description 20
- 229910052799 carbon Inorganic materials 0.000 claims description 19
- 239000006260 foam Substances 0.000 claims description 19
- 230000003584 silencer Effects 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 15
- 238000011010 flushing procedure Methods 0.000 claims description 14
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 91
- 239000003921 oil Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 7
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- 238000010276 construction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
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- 230000033228 biological regulation Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 239000002737 fuel gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Exhaust Silencers (AREA)
Abstract
A multi-station engine test bed exhaust device comprises a 1# engine test bed exhaust pipeline, a 2# engine test bed main exhaust pipeline, a 2# engine test bed auxiliary exhaust pipeline, a gas release pipeline, an exhaust main pipeline, a vertical oil-gas separation device and a silencing device; two ends of the vertical oil-gas separation device are respectively communicated with a main exhaust pipeline outlet and an inlet of an exhaust main pipeline of a test bed of the No. 2 engine; the exhaust pipeline of the test bed of the No.1 engine and the auxiliary exhaust pipeline of the test bed of the No. 2 engine are arranged in parallel and are communicated with the inlet of the main exhaust pipeline; the outlet of the exhaust main pipeline is communicated with the silencing device; the air release pipeline is communicated with the silencing device; the multi-station engine test bed exhaust device is suitable for the working condition that exhaust pipelines of a plurality of engine test beds or a plurality of stations of one engine test bed share the same silencing tower, avoids the mutual interference of air flows exhausted by the air outlet holes of a plurality of variable frequency diffusers, avoids secondary noise pollution and reduces silencing difficulty.
Description
Technical Field
The invention relates to the technical field of engine tests, in particular to an exhaust device of a multi-station engine test bed.
Background
Noise sources polluting various workplaces and surrounding environments of the engine test bed are mainly from aerodynamic noise, and the noise sources only exist in the test bed for testing, and when high-pressure, high-speed and high-temperature compressed air and fuel gas flow in metal or other enclosing structures or are discharged to the atmosphere, the noise sources generate more than 130dB (A). The noise is unnecessary sound of people, the frequency of sound which can be heard by the human ear is within 20HZ to 20000HZ, the noise which can be directly felt by people, and the noise beyond the frequency is the noise which can not be felt by the human ear and is also the object of noise control. At present, different countries regulate noise to be controlled within different sound pressure levels according to different environments. According to the relevant regulations of the national environmental protection laws, a new enterprise working for 8 hours a day allows a noise sound pressure level of 85dB (A), and 94dB (A) is allowed for 1 hour a day. For the engine test bed with the sound power greater than 130dB (A), the action time is short, the workplace is far away from towns and residential areas, and the noise control aim is mainly to enable the noise of the workplace of the test bed to reach the specified index and reduce the noise to the environment outside the test bed as far as possible.
In the existing engine test bed silencing device, a variable frequency diffuser is arranged at the tail end of an exhaust pipeline, variable frequency diffuser air outlet holes in the form of through holes are arranged on the surface of the variable frequency diffuser, noise frequency is shifted to high frequency by air flow through a plurality of variable frequency diffuser air outlet holes, and noise control difficulty is reduced by utilizing a high-frequency ratio low-frequency easy-silencing control principle; however, when exhaust pipelines and/or bypass pressure relief pipelines of a plurality of engine test benches or a plurality of stations of one engine test bench are/is arranged, a plurality of silencing towers are required to be arranged, so that construction and maintenance costs are greatly increased, and the same silencing towers are brought into, namely, when the exhaust pipelines and/or bypass pressure relief pipelines enter the same silencing towers, variable frequency diffusers are arranged at the tail ends of the pipelines, air flows exhausted by air outlets of the variable frequency diffusers have the phenomenon of mutual interference, secondary noise pollution is generated, and silencing difficulty is increased.
When the flame tube oil mist field test and the nozzle thermal protection test are carried out, the exhaust gas contains a large amount of coal oil vapor and vapor liquid drops, and the exhaust gas is discharged into the atmosphere after being subjected to oil-gas separation treatment. The fuel concentration in the exhaust gas meets the secondary emission standard of integrated emission standard of atmospheric pollutants (GB 16297-1996), namely the maximum allowable emission concentration of non-methane total hydrocarbon is 120mg/m < 3 >, and the maximum allowable emission rate is 53kg/h (exhaust gas height is 30 m).
As early as thirty in the last century, demisters were invented for industrial production. The demisters can be classified into various types according to the purpose or structure thereof, such as a louvered separator, a gravity sedimentation separator and a cyclone plate separator, but these separators are not efficient in separation and are not easy to separate mist having smaller particle diameters; although the silk screen demister can separate common mist, the mist is required to be clean, the airflow velocity is small, the resistance is large, the service period is short, and the equipment investment is large.
Therefore, the problems to be solved in the novel high-efficiency demister flame tube oil mist field test and the nozzle heat protection test with high separation efficiency, small resistance, high allowable airflow speed and strong anti-blocking function are researched and produced.
Disclosure of Invention
The technical solution of the invention is as follows: overcomes the defects of the prior art and provides a multi-station engine test bed exhaust device.
The technical scheme of the invention is as follows:
A multi-station engine test bed exhaust device comprises a 1# engine test bed exhaust pipeline, a 2# engine test bed main exhaust pipeline, a 2# engine test bed auxiliary exhaust pipeline, a gas release pipeline, an exhaust main pipeline, a vertical oil-gas separation device and a silencing device; two ends of the vertical oil-gas separation device are respectively communicated with a main exhaust pipeline outlet and an inlet of an exhaust main pipeline of a test bed of the No. 2 engine; the exhaust pipeline of the test bed of the No. 1 engine and the auxiliary exhaust pipeline of the test bed of the No. 2 engine are arranged in parallel and are communicated with the inlet of the main exhaust pipeline; the outlet of the exhaust main pipeline is communicated with the silencing device; the air release pipeline is communicated with the silencing device; the vertical oil-gas separation device comprises a demister and an activated carbon adsorption device; the gas outlet of the demister is communicated with the gas inlet of the activated carbon adsorption device through a gas conveying pipeline; the demister comprises a shell body formed by sequentially connecting an upper end enclosure, a cylinder section and a lower end enclosure, wherein the lower part of the cylinder section is provided with an air inlet which is communicated with an outlet of a main exhaust pipeline of a test bed of the No. 2 engine, and the top of the upper end enclosure is provided with a gas outlet of the demister; a baffle plate foam remover is arranged in the cylinder section and above the air inlet, a wire mesh foam remover is arranged at the top of the cylinder section, and the wire mesh foam remover is arranged above the baffle plate foam remover; a spray flushing device is arranged on the side wall of the cylinder section; the bottom of the lower seal head is provided with a liquid outlet; the activated carbon adsorption device comprises a horizontally arranged activated carbon box body; along the flowing direction of the gas discharged from the gas outlet of the demister, a vertical active carbon adsorption box and a horizontal active carbon adsorption box are sequentially arranged in the active carbon box body, the active carbon box body is provided with a gas outlet, and the gas outlet of the active carbon box body is communicated with the silencing device through a pipeline; meanwhile, the bottom of the activated carbon box body is provided with a liquid outlet of the activated carbon adsorption device.
Further, the silencer comprises a tower body, a silencing sheet assembly and 2 variable frequency diffusers, and each variable frequency diffuser has the same structure; each variable-frequency diffuser comprises a variable-frequency diffuser cylinder body and a variable-frequency diffuser guide cone, the variable-frequency diffuser cylinder body is a hollow circular cylinder body, a plurality of variable-frequency diffuser air outlet holes are formed in the surface of the cylinder body, and the variable-frequency diffuser air outlet holes are through holes penetrating through the circular cylinder body; the variable-frequency diffuser diversion cone is in a cone shape, the conical surface of the variable-frequency diffuser diversion cone is arranged inside the circular cylinder, and the bottom excircle of the variable-frequency diffuser diversion cone is fixedly connected with one end surface of the circular cylinder; in each variable-frequency diffuser, the projection of the air outlet hole of the variable-frequency diffuser along the axis direction of the air outlet hole of the variable-frequency diffuser is not on the variable-frequency diffuser cylinder body of the adjacent variable-frequency diffuser; the outlet of the exhaust main pipeline is communicated with the silencing device; the air release pipeline is communicated with the silencing device; the air release pipeline is communicated with one variable frequency diffuser, and the outlet of the main exhaust pipeline is communicated with the other variable frequency diffuser.
Further, the spray rinsing device comprises a first spray rinsing device, a second spray rinsing device, a third spray rinsing device and a fourth spray rinsing device.
Further, the baffle plate demister comprises a baffle plate and a barb, and the barb is arranged at the bending part of the baffle plate.
Further, the baffle demister comprises a plurality of baffle plates.
Further, the aperture ratio of the variable frequency diffuser air outlet holes of each variable frequency diffuser is 30% -65%.
Further, in each variable frequency diffuser, the sum of the areas of the air outlets of the variable frequency diffuser is larger than the cross-sectional area of the cylinder of the variable frequency diffuser.
Further, in each variable frequency diffuser, the sum of the areas of the air outlets of the variable frequency diffuser is at least 1.1 times the cross-sectional area of the cylinder of the variable frequency diffuser.
Further, a plurality of variable frequency diffusers are arranged in parallel.
Compared with the prior art, the invention has the advantages that:
1. In the multi-station engine test bed exhaust device, the exhaust pipeline, the exhaust pipelines of different test beds and the exhaust pipelines of different stations of the same test bed are led into the same silencing device, so that the construction and operation cost is reduced, the condition that air flows exhausted by the air outlet holes of a plurality of variable frequency diffusers are mutually interfered is avoided or reduced, secondary noise pollution is avoided, and the silencing difficulty is reduced.
2. In the multi-station engine test bed exhaust device, the oil-gas separation silencing device occupies small area, is suitable for oil-gas separation of high-flow gas, is easy to install, is simple to operate and good in defoaming effect, and can realize 99% removal of oil drops; meanwhile, the device can be suitable for any liquid-carrying gas, effectively reduces the blocking condition of the demister and ensures long-time use of the demister.
3. In the multi-station engine test bed exhaust device, the baffle plate demister is adopted to carry out 100% effective separation on oil drops and liquid drops with the diameter of 20um-50um, the silk screen demister is adopted to carry out 99% effective separation on the oil drops and the liquid drops with the diameter of 5um-20um, and in addition, the purpose of oil-gas separation can be realized by adjusting the plate spacing of the baffle plate demister and the thickness of the silk screen demister according to different oil-gas separation requirements.
4. In the multi-station engine test bed exhaust device, the oil-gas separation silencer adopts the spray flushing device to flush the baffle plate demister, so that scaling attached to the baffle plate demister after long-term operation is flushed and removed.
5. In the multi-station engine test bed exhaust device, the oil-gas separation silencer is provided with the activated carbon adsorption device, and the adsorption is carried out on oil drops below 5 mu m, so that the purification efficiency of organic waste gas can reach 90-95%, the gas treated by the vertical oil-gas separation device is ensured to meet the national emission standard, and in addition, the activated carbon can be desorbed and regenerated by hot air after being saturated for reusing or replacing the activated carbon.
6. In the multi-station engine test bed exhaust device, the silencer adopts 2 variable frequency diffusers, and as the air outlet holes of the variable frequency diffusers are arranged in each variable frequency diffuser, the projection along the axis direction of the variable frequency diffuser is not on the variable frequency diffuser cylinder bodies of the adjacent variable frequency diffusers, namely the air flow discharged by the air outlet holes of the variable frequency diffusers in each variable frequency diffuser is in non-contact with the adjacent variable frequency diffuser cylinder bodies, the adjacent variable frequency diffuser cylinder bodies cannot be impacted, and the condition that the air flows discharged by the air outlet holes of the variable frequency diffusers are mutually interfered is avoided or reduced, so that secondary noise pollution is avoided, and the silencing difficulty is reduced.
7. In the multi-station engine test bed exhaust device, the silencing device adopts 2 variable frequency diffusers, the sum of the areas of the variable frequency diffuser air outlet holes of each variable frequency diffuser is increased, the flow velocity of air flowing through the variable frequency diffuser air outlet holes is reduced, and the noise of flowing gas is reduced along with the reduction of the flow velocity of flowing gas, so that the original noise level of the air flow in the silencing tower is reduced, and the silencing difficulty is reduced.
8. In the multi-station engine test bed exhaust device, the silencing device adopts 2 variable frequency diffusers, is suitable for the working condition that exhaust pipelines and/or bypass pressure relief pipelines of a plurality of stations of a plurality of engine test beds or one engine test bed share the same silencing tower, avoids the mutual interference of air flows exhausted by air outlet holes of the variable frequency diffusers, avoids secondary noise pollution and reduces silencing difficulty.
Drawings
Fig. 1 is a schematic diagram of a multi-station engine test bed exhaust apparatus according to the present invention.
Fig. 2 is a schematic structural diagram of a vertical oil-gas separation device in the exhaust device of the multi-station engine test bed.
Fig. 3 is a cross-sectional view A-A in fig. 2.
Fig. 4 is a schematic diagram of a two-barb S2-type baffle plate demister with a vertical oil-gas separator in an exhaust device of a multi-station engine test bed.
Fig. 5 is a schematic diagram of a three-barb S3-type baffle demister with a vertical oil-gas separator in the multi-station engine test bed exhaust device of the invention.
Fig. 6 is a schematic diagram of a baffle plate demister with four barbs S4 of a vertical oil-gas separator in the multi-station engine test bed exhaust device of the invention.
Fig. 7 is a schematic diagram of the working principle of the activated carbon adsorption device of the vertical oil-gas separator in the multi-station engine test bed exhaust device.
Fig. 8 is a schematic structural view of a silencer in the exhaust device of the multi-station engine test bed of the present invention.
Fig. 9 is a schematic structural view of 2 variable frequency diffusers in a silencer in the exhaust device of a multi-station engine test bed of the present invention.
Fig. 10 is a schematic radial sectional view of 2 or more variable frequency diffusers in the silencer in the exhaust device of the multi-station engine test bed according to the present invention.
Fig. 11 is a schematic structural view of a first variable frequency diffuser among 2 variable frequency diffusers in a silencer in an exhaust device of a multi-station engine test bed according to the present invention.
Fig. 12 is a schematic structural view of a first variable diffuser cone in the first variable diffuser of fig. 11.
Fig. 13 is a schematic structural view of a second variable frequency diffuser among 2 variable frequency diffusers in a silencer in the exhaust device of the multi-station engine test bed of the present invention.
Fig. 14 is a schematic structural view of a second variable diffuser cone in the second variable diffuser of fig. 13.
Detailed Description
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
1-14, A multi-station engine test bed exhaust device comprises a 1# engine test bed exhaust pipeline 10, a 2# engine test bed main exhaust pipeline 20, a 2# engine test bed auxiliary exhaust pipeline 30, a gas release pipeline 40, an exhaust main pipeline 50, a vertical oil-gas separation device 200 and a silencer 100; two ends of the vertical oil-gas separation device 200 are respectively communicated with an outlet of the main exhaust pipeline 20 of the test bed of the No. 2 engine and an inlet of the main exhaust pipeline 50; the exhaust pipeline 10 of the test bed of the No. 1 engine and the auxiliary exhaust pipeline 30 of the test bed of the No. 2 engine are arranged in parallel and are communicated with the inlet of the main exhaust pipeline 50.
The vertical oil-gas separation device 200 comprises a foam remover 210 and an activated carbon adsorption device 220; the gas outlet of the demister 210 is communicated with the gas inlet of the activated carbon adsorption device 220 through a gas conveying pipeline 230; the demister 210 comprises a shell body formed by sequentially connecting an upper seal head 214, a cylinder section 215 and a lower seal head 216, wherein an air inlet 213 is formed in the lower part of the cylinder section 215, and the air inlet 213 is communicated with an outlet of a main exhaust pipeline 20 of the test bed of the No. 2 engine; a gas outlet of the demister 210 is arranged at the top of the upper seal head 214; a baffle plate demister 211 is arranged in the cylinder section 215 and above the air inlet 213, a wire mesh demister 212 is arranged at the top in the cylinder section 215, and the wire mesh demister 212 is arranged above the baffle plate demister 211; the demister 210 innovatively adopts a baffle plate demister 211 and silk screen demister 212 combined type efficient demolding device, wherein the baffle plate demister is used for effectively separating oil drops and liquid drops of 20um-50um by 100%; the silk screen demister is used for carrying out 99% effective separation on liquid drops below 20um and above 5 um; aiming at the characteristics that the flow channel of the baffle plate foam remover is relatively large and is not easy to block, gas firstly enters the baffle plate foam remover to remove oil drops with the diameter of 20-50 um preferentially, and the subsequent wire mesh foam remover is protected from being blocked due to relatively large oil quantity.
Preferably, the bottom of the lower seal head 216 is provided with a supporting leg 219 of the demister, and the elevation of the demister 210 is adjusted by adjusting the supporting leg 219 of the demister, so as to adapt to pipelines with different elevations.
Preferably, baffle demister 211 comprises baffle 2111 and barb 2112, said barb 2112 being provided at the bend of said baffle 2111; the baffle demister 211 comprises a plurality of baffle plates 2111 arranged in parallel, and a barb 2112 is arranged at the bending position of each baffle plate 2111.
The baffle demister 211 according to the present invention is separated according to the principle of physical inertia, and when the air flow with entrained liquid droplets or solid particles passes through a specially designed baffle plate at a speed of 3-9m/s, the movement direction of the liquid droplets or solid particles is changed from the movement direction of the gas under the action of inertial force at the turning position of the baffle plate, so that the liquid droplets or solid particles are separated from the gas. The separation process can be divided into the following three steps:
1. The gas is divided into a plurality of individual flow channels.
2. The inertial force impinges the droplets on the baffle plate.
3. The drop film moves forward to the barb and is separated.
The baffle plate type foam remover is structurally characterized in that the forms of baffle plate type foam removers are different according to different purposes, wherein the S type foam remover is an impact type high-efficiency foam remover mainly applied to air flow in the horizontal direction, higher surface speed is allowed under the conditions of low resistance drop and high-efficiency separation, the baffle plate type foam remover with two barbs S2 can be arranged according to actual needs according to the size of the limit drop diameter of mist, the mist drop load and whether dust is contained in the air flow, and the principle schematic diagrams of the baffle plate type foam remover with three barbs S3 and the baffle plate type foam remover with four barbs S4 are shown in the attached drawings.
The baffle demister 211 can effectively remove droplets with different sizes by changing the form of baffle plates, for example, the baffle angle is 60 degrees, 90 degrees or 120 degrees, the baffle plates with grooves and the like, and the best defoaming effect of the droplets with the size of 30 μm can be achieved by adjusting the baffle plate spacing.
The wire mesh demister 212 achieves the best defoaming effect for 5 μm droplets by changing the type of wire mesh, such as SP type, HP type, DP type and HR type, and the thickness of the wire mesh demister.
The side wall of the cylinder section 215 is provided with spray flushing devices, preferably, the spray flushing devices comprise a first spray flushing device 2171, a second spray flushing device 2172, a third spray flushing device 2173 and a fourth spray flushing device 2174. The baffle plate demister 211 is washed by a spray head, and scaling attached to the baffle plate demister 211 after long-term operation is washed and removed.
The bottom of the lower seal head 216 is provided with a liquid outlet 218 for intensively discharging the discharged liquid.
The activated carbon adsorption apparatus 220 includes a horizontally disposed activated carbon tank 221; along the flow direction of the gas discharged from the gas outlet of the demister, a vertical active carbon adsorption box 222 and a horizontal active carbon adsorption box 223 are sequentially arranged in the active carbon box body, the active carbon box body 221 is provided with a gas outlet 225, and the gas outlet 225 of the active carbon box body 221 is communicated with the silencer 100 through a pipeline; meanwhile, an activated carbon adsorption device liquid outlet 224 is arranged at the bottom of the activated carbon box. Preferably, the bottom of the activated carbon tank 221 is provided with a supporting leg 226, so that the elevation of the activated carbon tank 221 can be adjusted by the supporting leg 226. The active carbon adsorption device is arranged for adsorbing oil drops below 5 mu m, the adsorption can enable the purification efficiency of the organic waste gas to reach 90-95%, and further, the gas treated by the vertical oil-gas separation device meets the national emission standard, and in addition, the active carbon can be desorbed and regenerated by hot air after being adsorbed and saturated to enable the active carbon to be reused or replaced.
The silencer comprises a tower body 130, a silencing sheet assembly 140, a first variable frequency diffuser 110 and a second variable frequency diffuser 120, wherein each variable frequency diffuser has the same structure; each variable-frequency diffuser comprises a variable-frequency diffuser cylinder body and a variable-frequency diffuser guide cone, the variable-frequency diffuser cylinder body is a hollow circular cylinder body, a plurality of variable-frequency diffuser air outlet holes are formed in the surface of the cylinder body, and the variable-frequency diffuser air outlet holes are through holes penetrating through the circular cylinder body; the variable frequency diffuser guide cone is cone-shaped, the conical surface of the variable frequency diffuser guide cone is arranged inside the circular cylinder, and the bottom excircle of the variable frequency diffuser guide cone is fixedly connected with one end face of the circular cylinder. In each variable-frequency diffuser, the projection of the air outlet hole of the variable-frequency diffuser along the axis direction of the air outlet hole of the variable-frequency diffuser is not on the variable-frequency diffuser cylinder body of the adjacent variable-frequency diffuser; the bleed air line 40 communicates with the first variable frequency diffuser 110, and the outlet of the main exhaust line 50 communicates with the second variable frequency diffuser 120.
The exhaust gas of the exhaust pipeline 10 of the test bed of the No. 1 engine and the gas outlet 225 of the active carbon box 221 enter from the end face of one end of the opening of the variable frequency diffuser cylinder, are guided by the variable frequency diffuser guide cone and are discharged from the air outlet holes of the variable frequency diffuser, and the gas entering the variable frequency diffuser cylinder is guided by the variable frequency diffuser guide cone with a conical shape, so that the gas entering the variable frequency diffuser cylinder is uniformly discharged from the air outlet holes of the variable frequency diffuser, the subsequent silencing is facilitated, and the silencing effect is improved.
Preferably, the first variable frequency diffuser 110 and the second variable frequency diffuser 120 have the same structure, and further preferably, the first variable frequency diffuser 110 and the second variable frequency diffuser 120 are disposed in parallel.
The first variable frequency diffuser 110 comprises a first variable frequency diffuser cylinder 111 and a first variable frequency diffuser guide cone 113, the first variable frequency diffuser cylinder 111 is a hollow circular cylinder, a plurality of first variable frequency diffuser air outlet holes 112 for discharging gas are arranged on the surface of the cylinder, and the plurality of first variable frequency diffuser air outlet holes 112 are through holes penetrating through the circular cylinder; the first variable frequency diffuser guide cone 113 is of a conical shape, the conical surface of the first variable frequency diffuser guide cone 113 is arranged inside the circular cylinder, the diameter of the outer circle at the bottom of the first variable frequency diffuser guide cone 113 is the same as the inner diameter of the circular cylinder, the outer circle at the bottom of the first variable frequency diffuser guide cone 113 is fixedly connected with one end face of the circular cylinder, and one end of the first variable frequency diffuser cylinder 111 is closed.
The second variable frequency diffuser 120 comprises a second variable frequency diffuser barrel 121 and a second variable frequency diffuser guide cone 123, the second variable frequency diffuser barrel 121 is a hollow circular barrel, a plurality of second variable frequency diffuser air outlet holes 122 for discharging gas are arranged on the surface of the barrel, and the plurality of second variable frequency diffuser air outlet holes 122 are through holes penetrating through the circular barrel; the second variable frequency diffuser guide cone 123 is of a conical shape, the conical surface of the second variable frequency diffuser guide cone 123 is arranged inside the circular cylinder, the diameter of the bottom outer circle of the second variable frequency diffuser guide cone 123 is the same as the inner diameter of the circular cylinder, the bottom outer circle of the second variable frequency diffuser guide cone 123 is fixedly connected with one end face of the circular cylinder, and one end of the second variable frequency diffuser cylinder 121 is closed.
The first variable frequency diffuser cylinder 111 has a first circular cross section, herein defined as a first circle, and the second variable frequency diffuser cylinder 121 has a second circular cross section, herein defined as a second circle, in radial cross sections of the first variable frequency diffuser 110 and the second variable frequency diffuser 120, a first variable frequency diffuser first tangent line L 21 and a first variable frequency diffuser second tangent line L 22 tangential to the second circle are respectively formed from the center O 1 of the first circle to the second circle, The included angle between the first tangent line L 21 of the first variable frequency diffuser and the second tangent line L 22 of the first variable frequency diffuser is a first variable frequency diffuser cut angle theta 1, and a part S 1 of the first variable frequency diffuser cylinder 111 corresponding to the first variable frequency diffuser cut angle theta 1 is not provided with a first variable frequency diffuser air outlet hole 112; Correspondingly, a first tangent line L 11 of the second variable frequency diffuser and a second tangent line L 12 of the second variable frequency diffuser are respectively made from the center O 2 of the second circle to the first circle, the included angle between the first tangent line L 11 of the second variable frequency diffuser and the second tangent line L 12 of the second variable frequency diffuser is a second variable frequency diffuser cut angle theta 2, The second variable frequency diffuser outlet hole 122 is not formed in the portion S 2 of the second variable frequency diffuser barrel 121 corresponding to the second variable frequency diffuser chamfer angle θ 2. accordingly, the gas discharged from the first variable frequency diffuser outlet 112 of the first variable frequency diffuser 110 does not impact the second variable frequency diffuser cylinder 121, and similarly, the gas discharged from the second variable frequency diffuser outlet 122 of the second variable frequency diffuser 120 does not impact the first variable frequency diffuser cylinder 111, and even if there is little collision between the gas discharged from the first variable frequency diffuser outlet 112 of the first variable frequency diffuser 110 and the gas discharged from the second variable frequency diffuser outlet 122 of the second variable frequency diffuser 120, the collision does not generate secondary noise pollution.
Preferably, the aperture ratio of the outlet hole of the variable frequency diffuser of each variable frequency diffuser is 30% -65%, and the flow velocity of the air passing through the outlet hole of the variable frequency diffuser is reduced by improving the aperture ratio of the outlet hole of the variable frequency diffuser of each variable frequency diffuser, and the noise of flowing gas is reduced along with the reduction of the flow velocity of flowing gas, so that the original noise level of the air flow in the silencing tower is reduced, and the silencing difficulty is reduced.
Preferably, in each variable frequency diffuser, the sum of the areas of the air outlets of the variable frequency diffuser is larger than the cross-sectional area of the cylinder of the variable frequency diffuser, further preferably, in each variable frequency diffuser, the sum of the areas of the air outlets of the variable frequency diffuser is at least 1.1 times of the cross-sectional area of the cylinder of the variable frequency diffuser, and the flow velocity of the air flow passing through the air outlets of the variable frequency diffuser is reduced by enlarging the sum of the areas of the air outlets of the variable frequency diffuser.
Preferably, a plurality of variable frequency diffusers are arranged in parallel.
Preferably, the tower 130 is a reinforced concrete structure or a steel frame structure.
The silencer assembly, the installation method of the silencer assembly and the connection method of the silencer assembly and the tower body, and the connection method of the variable-frequency diffuser and the tower body are in the prior art, and particularly refer to prior applications CN201420056662.6, CN201420056663.0 and CN201420057351.1 of the applicant.
The working process of the multi-station engine test bed exhaust device is as follows:
The gas source redundant gas enters the silencer 100 through the gas release pipeline, and the gas of the auxiliary paths of the No. 1 engine test bed and the No. 2 engine test bed respectively passes through the exhaust pipeline 10 of the No. 1 engine test bed and the auxiliary exhaust pipeline 30 of the No. 2 engine test bed and then is converged into the exhaust main pipeline 50 to enter the silencer;
The gas discharged from the main exhaust pipeline 20 of the test bed of the No.2 engine enters the shell of the demister 210 through the gas inlet 213, the gas flow enters the baffle plate demister 211 at a flow speed of 3m/s-6m/s, the baffle plate demister 211 divides the gas flow into a plurality of single flow channels through the baffle plate 2111, oil drops collide on the baffle plate 2111 through inertia effect by changing the direction of the gas flow, the oil drop film moves forward to the barb and is separated, and after the 20um-50um oil drops entrained in the gas flow are removed, the gas flow enters the wire mesh demister 212 to separate the oil drops of 5um-20 um; however, the combined demister of the baffle plate demister 211 and the wire mesh demister 212 in the demister 210 has not been used for effectively removing oil drops below 5um, so that the gas outlet of the demister 210 is connected with the activated carbon adsorption device 220 through the gas conveying pipeline 230, and the gas discharged from the gas outlet of the demister 210 adsorbs organic waste gas through the tiny pores of the activated carbon, so that the gas discharge reaches the discharge standard and then flows into the main exhaust pipeline 50 to enter the silencer;
The gas discharged from the gas discharge pipeline 40 and the gas discharge main pipeline 50 enters from the end face of one end of the opening of the variable frequency diffuser cylinder body through a pipeline, is guided by a variable frequency diffuser guide cone, is discharged through a plurality of variable frequency diffuser gas outlet holes, and the gas flow shifts the noise frequency to high frequency through a dry variable frequency diffuser gas outlet hole, so that the difficulty of noise control is reduced by utilizing the principle that the noise is easy to be damped and controlled at a high frequency than a low frequency; the gas exhausted by the gas outlet holes of the variable-frequency diffuser is exhausted from the outlet at the top of the tower body after noise reduction through the staggered airflow channels formed by the 3 layers of silencing sheet assemblies.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (7)
1. The multi-station engine test bed exhaust device is characterized by comprising a 1# engine test bed exhaust pipeline, a 2# engine test bed main exhaust pipeline, a 2# engine test bed auxiliary exhaust pipeline, a deflation pipeline, an exhaust main pipeline, a vertical oil-gas separation device and a silencing device;
Two ends of the vertical oil-gas separation device are respectively communicated with a main exhaust pipeline outlet and an inlet of an exhaust main pipeline of a test bed of the No. 2 engine; the exhaust pipeline of the test bed of the No. 1 engine and the auxiliary exhaust pipeline of the test bed of the No. 2 engine are arranged in parallel and are communicated with the inlet of the main exhaust pipeline; the outlet of the exhaust main pipeline is communicated with the silencing device; the air release pipeline is communicated with the silencing device;
the vertical oil-gas separation device comprises a demister and an activated carbon adsorption device; the gas outlet of the demister is communicated with the gas inlet of the activated carbon adsorption device through a gas conveying pipeline;
The demister comprises a shell body formed by sequentially connecting an upper end enclosure, a cylinder section and a lower end enclosure, wherein the lower part of the cylinder section is provided with an air inlet which is communicated with an outlet of a main exhaust pipeline of a test bed of the No. 2 engine, and the top of the upper end enclosure is provided with a gas outlet of the demister;
A baffle plate foam remover is arranged in the cylinder section and above the air inlet, a wire mesh foam remover is arranged at the top of the cylinder section, and the wire mesh foam remover is arranged above the baffle plate foam remover; a spray flushing device is arranged on the side wall of the cylinder section; the bottom of the lower seal head is provided with a liquid outlet;
The activated carbon adsorption device comprises a horizontally arranged activated carbon box body; along the flowing direction of the gas discharged from the gas outlet of the demister, a vertical active carbon adsorption box and a horizontal active carbon adsorption box are sequentially arranged in the active carbon box body, the active carbon box body is provided with a gas outlet, and the gas outlet of the active carbon box body is communicated with the silencing device through a pipeline; meanwhile, the bottom of the activated carbon box body is provided with a liquid outlet of the activated carbon adsorption device;
The silencer comprises a tower body, a silencing sheet assembly and 2 variable frequency diffusers, and each variable frequency diffuser has the same structure;
Each variable-frequency diffuser comprises a variable-frequency diffuser cylinder body and a variable-frequency diffuser guide cone, the variable-frequency diffuser cylinder body is a hollow circular cylinder body, a plurality of variable-frequency diffuser air outlet holes are formed in the surface of the cylinder body, and the variable-frequency diffuser air outlet holes are through holes penetrating through the circular cylinder body; the variable-frequency diffuser diversion cone is in a cone shape, the conical surface of the variable-frequency diffuser diversion cone is arranged inside the circular cylinder, and the bottom excircle of the variable-frequency diffuser diversion cone is fixedly connected with one end surface of the circular cylinder;
In each variable-frequency diffuser, the projection of the air outlet hole of the variable-frequency diffuser along the axis direction of the air outlet hole of the variable-frequency diffuser is not on the variable-frequency diffuser cylinder body of the adjacent variable-frequency diffuser;
the outlet of the exhaust main pipeline is communicated with the silencing device; the air release pipeline is communicated with the silencing device; the air release pipeline is communicated with one variable-frequency diffuser, and the outlet of the main exhaust pipeline is communicated with the other variable-frequency diffuser;
the spray flushing device comprises a first spray flushing device, a second spray flushing device, a third spray flushing device and a fourth spray flushing device.
2. The apparatus of claim 1, wherein the baffle demister comprises a baffle and a barb, the barb being disposed at a bend of the baffle.
3. The apparatus of claim 2 wherein the baffle demister includes a plurality of baffle plates therein.
4. The apparatus according to claim 1, wherein: the aperture ratio of the outlet hole of the variable frequency diffuser of each variable frequency diffuser is 30% -65%.
5. The apparatus according to claim 1, wherein: in each variable frequency diffuser, the sum of the areas of the air outlets of the variable frequency diffuser is larger than the cross-sectional area of the cylinder of the variable frequency diffuser.
6. The apparatus according to claim 5, wherein: in each variable frequency diffuser, the sum of the areas of the air outlets of the variable frequency diffuser is at least 1.1 times of the cross-sectional area of the cylinder of the variable frequency diffuser.
7. The apparatus according to claim 2, wherein: the variable frequency diffusers are arranged in parallel.
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| US20120152007A1 (en) * | 2007-01-12 | 2012-06-21 | Richard Holmes | Testing performance of a material for use in a jet engine |
| CN201594039U (en) * | 2009-12-10 | 2010-09-29 | 中国航空规划建设发展有限公司 | Aircraft engine test bed exhaust silencing device |
| CN102087853B (en) * | 2010-12-03 | 2012-11-28 | 中国航空规划建设发展有限公司 | Component integrated type ultralow-frequency sound eliminating device for aeroengine test bed |
| KR101516491B1 (en) * | 2013-10-30 | 2015-05-04 | 손계동 | Multi flow type-vehicle muffler having discharging heat device |
| CN210802910U (en) * | 2019-12-02 | 2020-06-19 | 北京航天三发高科技有限公司 | Engine test bed |
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