CN213838726U - Low-infrared radiation exhaust system of high-speed assault boat - Google Patents
Low-infrared radiation exhaust system of high-speed assault boat Download PDFInfo
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- CN213838726U CN213838726U CN202022227415.6U CN202022227415U CN213838726U CN 213838726 U CN213838726 U CN 213838726U CN 202022227415 U CN202022227415 U CN 202022227415U CN 213838726 U CN213838726 U CN 213838726U
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The utility model discloses a low infrared radiation exhaust system of a high-speed assault boat, which comprises a first exhaust pipe, an ejector, a silencer assembly, a second exhaust pipe, a compensator and an outlet pipe which are connected in sequence; the ejector is composed of a double-wall pipe, the height of the pipe orifice of the double-wall pipe close to the silencer assembly is lower than that of the pipe orifice of the double-wall pipe far away from the silencer assembly, a nozzle socket is arranged on the double-wall pipe, and a nozzle retainer is arranged on the nozzle socket. The utility model discloses a sea water cooling exhaust increases noise elimination performance, reduces in the exhaust harmful component and discharges in the atmosphere, increases safety on the ship. Seawater injection also reduces exhaust volume flow, thus reducing the weight and size of the exhaust system; the installation method of the system is ingenious in design, and the deformation of pipelines such as a system exhaust pipe and the like or the damage caused in the installation process are avoided.
Description
Technical Field
The utility model relates to a low infrared radiation exhaust system of high-speed assault ship.
Background
Fossil fuels are used in internal combustion engines such as diesel engines and internal combustion engines such as boilers. As fossil fuels are burned, exhaust gas containing NOX, SOX, oil, fine particles, and the like is generated, which becomes an environmental pollution source. Therefore, attempts have been made to reduce the sources of environmental pollution in exhaust gases by improving fuel, increasing combustion efficiency, introducing exhaust gas treatment equipment, and the like.
With respect to facilities such as vehicles, factories, or thermal power plants existing on land, substantial improvements have been made.
However, in a ship traveling on the sea or river, the engine exhaust gas amount is much larger than that of an automobile or the like, and there is almost no remaining space in which an exhaust gas treatment device can be disposed. Also, from an economic point of view, it is difficult to introduce land-oriented technologies and equipment.
For example, as a technique for treating NOX in exhaust gas, there is an ammonia SCR (Selective catalytic reduction) method. The ammonia SCR method is a method of decomposing NOX in exhaust gas into water and nitrogen by reacting with ammonia, and has been put into practical use on land. However, the ammonia SCR method has to secure a large amount of ammonia, and thus is difficult to apply to a ship.
In addition, as for SOX, a magnesium hydroxide method using a scrubber, a lime-gypsum method, or the like has been put into practical use on land. Further, as a technique for using them in ships, there is a method in which seawater is introduced into a scrubber to absorb SOX in exhaust gas with seawater, and SOX is oxidized to sulfate ions by an oxygenator and then treated. In addition, in the installation of an exhaust system, no method which can avoid damaging compensators such as a corrugated pipe and the like in a better installation mode exists at present.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the defect that exists among the prior art, provide a low infrared radiation exhaust system of high-speed assault ship, adopt sea water cooling exhaust, increase noise elimination performance, harmful components discharges in the reduction exhaust in the atmosphere, increases safety on the ship. Seawater injection also reduces exhaust volume flow, thus reducing the weight and size of the exhaust system; the installation method of the system is ingenious in design, and the deformation of pipelines such as a system exhaust pipe and the like or the damage caused in the installation process are avoided.
In order to achieve the purpose, the technical scheme of the utility model is to design a low infrared radiation exhaust system of a high-speed assault boat, which comprises a first exhaust pipe, an ejector, a silencer assembly, a second exhaust pipe, a compensator and an outlet pipe which are connected in sequence; the ejector is composed of a double-wall pipe, the height of the pipe orifice of the double-wall pipe close to the silencer assembly is lower than that of the pipe orifice of the double-wall pipe far away from the silencer assembly, a nozzle socket is arranged on the double-wall pipe, and a nozzle retainer is arranged on the nozzle socket. Each exhaust system provided by the north sea of the river yin is identified by injecting seawater into the exhaust. The seawater is adopted for cooling and exhausting, so that the noise elimination performance is improved, harmful components in the exhausted gas are reduced to be discharged into the atmosphere, and the safety of the ship is improved. Seawater injection also reduces exhaust volume flow and therefore can reduce the weight and size of the exhaust system. At the inlet of the injector, seawater is injected into the exhaust gas and the exhaust gas is cooled to about 60 ℃. From the ejector, the mixture of cooled exhaust gas, injected seawater and water vapor is directed into a downstream muffler. The injector is also part of the exhaust line. The design of the on-injector injection device facilitates the injection of seawater into the exhaust stream to cool the exhaust. The injected seawater is positioned in the main injector and is introduced into the main silencer (secondary injection); the injected seawater also reduces noise and reduces the pressure of the system. Seawater under pressure reaches the ejector unit and circulates through the annular double-walled chamber directly into each single nozzle holder assembly. The ejector portion of the muffler and the butt stock of the ejector components have perforations that conform to the double wall of the chamber. The associated injector-injector assembly is bolted to the injector seat and sealed with an o-ring. Note that the nozzles must be aligned with the exhaust flow. The spray must be in line with the flow direction of the exhaust gas. The seawater is dispersed by nozzles of different spray characteristics and different flow rates. The design principle of the nozzle is that the characteristic volume flow rate of the nozzle hole of the nozzle is in a specific pressure range and is specific to the specific seawater pressure. This design requires a certain volume of water to be used each time to ensure that all cooling, flushing and pressure drop is achieved. This volume is calculated and the appropriate number and type of nozzles are selected accordingly. In the ejector part of the silencer and ejector parts, the spray mode and the spray angle ensure that the gas is exposed to a larger water surface area, and effective heat transfer between the two media is realized.
The further technical scheme is that at least two supporting elements are arranged on the first exhaust pipe, the ejector, the silencer assembly, the second exhaust pipe, the compensator and the outlet pipe, one end of each supporting element is fixedly connected to the ship body, and the other end of each supporting element is connected to the exhaust system.
A further technical scheme is that the first exhaust pipe is connected with the engine through a flexible corrugated pipe, the first exhaust pipe is made of stainless steel AISI 316L, and a sealing element discharged from the opening of the first exhaust pipe is made of graphite.
The further technical scheme is that the ejector is made of an ASTM titanium alloy grade 2 material.
The silencer assembly is fixed on the ship structure through a flexible support part; and the surface of the first exhaust pipe is coated with a heat insulation layer. The seawater injection design of the exhaust system reduces the surface temperature behind the ejector. Under normal conditions, with the system fully operational and in compliance with design intent, the surface temperature is about 60 ℃, which is an acceptable equipment temperature in the machine space. The exhaust system is therefore covered only with the insulation up to the component in front of the injector. Whether or not the injector is spraying the next component, the injector is cold due to the double skin water jacket between the inlet and outlet flanges. The insulation of the hot section of the exhaust system is designed to reach the same surface temperature (about 60 ℃) to maintain equilibrium with the rest of the exhaust pipe.
The utility model also provides a technical scheme does, the method of the low infrared radiation exhaust system of high-speed assault ship of installation, including following step:
s1: connecting an outlet pipe with an interface flange on the ship body;
s2: making a compensator false mould and connecting the compensator false mould with an outlet pipe;
s3: connecting a second exhaust pipe to the compensator dummy;
s4: mounting the muffler assembly to the second exhaust pipe;
s5: mounting the ejector to the muffler assembly;
s6: connecting a first exhaust pipe to the ejector;
s7: manufacturing an engine compensator dummy mould and a flexible supporting dummy mould, and connecting the engine compensator dummy mould with a first exhaust pipe;
s8: installing a seawater supply assembly and a temperature sensor;
s9: removing the false model of the engine compensator, providing the engine compensator to an installation position, matching the flange surface of the engine compensator with the flange surface of the first exhaust pipe, and connecting the other flange of the engine compensator with the flange of the diesel engine;
s10: removing the compensator dummy, compressing the compensator using a compression tool, inserting a seal between the compensator and the flange of the adjacent component, and maintaining the compensator in a predetermined position; the compression tool is loosened and removed, the compensator flange is moved toward the mating surface, and the compensator flange is fixedly attached to the flange of the adjacent component using the fasteners. The flexible supporting dummy die is the same as the supporting element, one end of the flexible supporting dummy die is fixedly connected to the ship body, and the other end of the flexible supporting dummy die is connected to the exhaust system (specifically, the first exhaust pipe, the ejector, the silencer assembly, the second exhaust pipe, the compensator or the outlet pipe, and the mounting position and the situation are flexibly selected).
The further technical scheme is that the compensator dummy mould and the compensator are in copying.
The further technical scheme is that the compression tool comprises a threaded rod, two compensator chucks are arranged on the threaded rod in a sliding mode, round holes with the hole diameters larger than the outer diameter of threads on the threaded rod are formed in the compensator chucks, two adjusting nuts are arranged in a matched mode with the threaded rod and close to two ends of the threaded rod, and the two compensator chucks are arranged between the two nuts.
The main body portion of the muffler assembly is also made of ASTM titanium alloy grade 2 material; the main muffler is designed as a reflex muffler, the main function of which is to attenuate the sound pressure level carried by the exhaust gas flow. The sound pressure pulses are attenuated by destructive interference of the sound pressure waves. Secondary functions: allowing the bore to be probed through the inspection port into the interior; placing a nozzle holder assembly for secondary injection; housing a meter element for monitoring temperature;
the second exhaust pipe is part of an exhaust gas duct. The main function of all parts of the exhaust pipe is to safely guide the exhaust gases from the engine to the exhaust outlet. After the seawater is injected, the seawater is a single exhaust pipe. The choice of materials ensures corrosion and temperature cycle resistance to meet the design life of the vessel. The diameter selected meets the overall system back pressure specification at maximum load. The exhaust pipe provides a flange of appropriate size to accommodate the seal that will prevent any exhaust gas from leaking to the vessel. The flange is designed to accept a specified torque value of the bolts so as to form a tight seal without deformation.
And the compensator and the second exhaust pipe are fixedly assembled by bolts. Based on the vibration analysis results, the length of the compensator is mainly determined by the axial displacement and the lateral displacement. Thermal expansion is taken into account when selecting the compensator. The compensator is made of ASTM titanium grade 2 and stainless steel AISI 316L materials; the compensator performs the following main functions: it absorbs thermal expansion and contraction; it can absorb limited vibration; when it allows limited dynamic axial deflection, the system is in use; when it allows limited dynamic axial deflection, the system is in use;
the outlet pipe is part of the exhaust duct. The main function of all parts of the exhaust pipe is to safely guide the exhaust gases from the engine to the exhaust outlet. The exhaust seawater mixture is obtained after the seawater is injected. The choice of materials ensures corrosion and temperature cycle resistance to meet the design life of the vessel. The diameter selected meets the overall system back pressure specification at maximum load. The exhaust pipe provides a flange of appropriate size to accommodate the seal that will prevent any exhaust gas from leaking to the vessel. The flange is designed to accept a specified torque value of the bolts so as to form a tight seal without deformation. The primary functions of the interface flange include sealing against hull penetration, primarily to protect the integrity of the hull, to protect the hull from damage by the exhaust pipe, and to support the exhaust system.
In order to support the exhaust system, the support element will be used mounted on a dedicated bracket of the entire exhaust system. The foundation of the support interfacing with the hull should be provided by the shipyard. In order to prevent heat transfer to the container structure, each support element is insulated.
The seawater supply should be provided by a seawater pump driven by a dedicated PTO (diesel engine PTO-TAKE-OFF) which is a kind of POWER TAKE-OFF, also called POWER takeoff. The seawater supply system assembly includes a pump, a filter, a service valve, a regulator valve and an ejector connected to the inlet of the pump and the seawater piping system, the discharge port pump and the seawater piping system, and piping systems therebetween by flexible hoses. Seawater is supplied to the injector unit by a mechanically driven pump. The pump is mounted in the lower left PTO position of the engine. In any case, when the engine is not running, it is impossible to inject seawater into the exhaust system, thereby ensuring a normal supply of seawater to the exhaust system. However, emergency supplies may be deployed where the water supply system of the vessel can provide water. In order to give the system flexibility to cope with vibrations, a flexible hose is mounted on the supply conduit. A water supply valve is installed in the seawater supply system to provide local isolation when the injector is in use or serviced. A y-filter located before the seawater pump inlet to keep clean water passing through the pump. In all cases there is an emergency seawater supply connected to the injector from the marine seawater system. The seawater pressure must then be monitored on a pressure gauge, and the flow must be adjusted manually on the supply pipe.
To monitor the surface temperature of the exhaust system, a temperature sensor would be installed at a dedicated connection (down from the injection point) to the inlet of the main muffler. The exhaust gas temperature sensor has a safety critical function.
Therefore, the device should be in perfect technical condition and should be properly calibrated at any time. If the feedback signal is corrupted or the unit is in a bad state, it may cause a system malfunction. Exhaust temperature is an indication of system function and must be below a specified maximum value. The primary purpose of the sensor is to provide a feedback signal to the Engine Control System (ECS). The signal has an alarm function.
The utility model has the advantages and the beneficial effects that: the seawater is adopted for cooling and exhausting, so that the noise elimination performance is improved, harmful components in the exhausted gas are reduced to be discharged into the atmosphere, and the safety of the ship is improved. Seawater injection also reduces exhaust volume flow, thus reducing the weight and size of the exhaust system; the installation method of the system is ingenious in design, and the deformation of pipelines such as a system exhaust pipe and the like or the damage caused in the installation process are avoided. The seawater injection design of the exhaust system reduces the surface temperature behind the ejector. Under normal conditions, with the system fully operational and in compliance with design intent, the surface temperature is about 60 ℃, which is an acceptable equipment temperature in the machine space. The exhaust system is therefore covered only with the insulation up to the component in front of the injector. Whether or not the injector is spraying the next component, the injector is cold due to the double skin water jacket between the inlet and outlet flanges. The insulation of the hot section of the exhaust system is designed to reach the same surface temperature (about 60 ℃) to maintain equilibrium with the rest of the exhaust pipe. The profiling dummy die is adopted to connect the inflexible pipe fittings so as to determine the installation positions of all parts of the whole exhaust system, then the flexible pipe fittings such as a compensator in the form of a corrugated pipe are connected to the exhaust system after the dummy die is removed, the damage of the flexible parts during the installation is avoided, and the accurate and rapid installation positions of other parts can be ensured due to the arrangement of the rigid material dummy die (such as the profiling dummy die made of hard plastic or hard rubber) during the installation.
Drawings
Fig. 1 is a schematic view of a low ir exhaust system of a high speed assault boat of the present invention;
FIG. 2 is a compression tool of the present invention;
FIG. 3 is a perspective view of the compensator cartridge of FIG. 2;
FIG. 4 is a schematic illustration of the operation of a compression compensator using the compression tool of FIG. 2.
In the figure: 1. a first exhaust pipe; 2. an ejector; 3. a muffler assembly; 4. a cabin penetrating piece; 5. a second exhaust pipe; 6. a compensator; 7. an outlet pipe; 8. a support element; 9. a threaded rod; 10. a compensator cartridge; 11. a circular hole; 12. and a nut.
Detailed Description
The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1 to 4, the utility model relates to a low infrared radiation exhaust system of a high-speed assault boat, which comprises a first exhaust pipe 1, an ejector 2, a silencer assembly 3, a second exhaust pipe 5, a compensator 6 and an outlet pipe 7 which are connected in sequence; the ejector 2 is composed of a double-walled pipe, the pipe orifice of the double-walled pipe close to the silencer assembly 3 is lower in height than the pipe orifice of the double-walled pipe far from the silencer assembly 3, a nozzle socket is arranged on the double-walled pipe, and a nozzle retainer is arranged on the nozzle socket. The silencer assembly 3 and the second exhaust pipe 5 are connected to the first exhaust pipe 1, the ejector 2, the silencer assembly 3, the second exhaust pipe 5, the compensator 6 and the outlet pipe 7 through cabin penetrating pieces 4, at least two supporting elements 8 are arranged on the exhaust pipe, one ends of the supporting elements 8 are fixedly connected to the ship body, and the other ends of the supporting elements are connected to the exhaust system. First exhaust pipe 1 passes through flexible bellows and links to each other with the engine, and first exhaust pipe 1 adopts stainless steel AISI 316L material, and the sealing member that the 1 mouth of pipe of first exhaust pipe goes out adopts the graphite material. The injector 2 is made of ASTM titanium alloy grade 2 material. The silencer assembly 3 is fixed on the ship structure through a flexible support piece; and the surface of the first exhaust pipe 1 is coated with a heat insulation layer.
A method of installing a low ir exhaust system for a high speed assault craft comprising the steps of:
s1: the outlet pipe 7 is connected with an interface flange on the ship body;
s2: a dummy mold of the compensator 6 is made and connected to the outlet pipe 7;
s3: connecting the second exhaust pipe 5 to the compensator 6 dummy;
s4: mounting the muffler assembly 3 to the second exhaust pipe 5;
s5: mounting the ejector 2 to the muffler assembly 3;
s6: connecting the first exhaust pipe 1 to the ejector 2;
s7: manufacturing a false model of the engine compensator 6 and a flexible supporting false model, and connecting the false model of the engine compensator 6 with the first exhaust pipe 1;
s8: installing a seawater supply assembly and a temperature sensor;
s9: removing the false model of the engine compensator 6 and then providing the engine compensator 6 to the installation position, matching the flange surface of the engine compensator 6 with the flange surface of the first exhaust pipe 1, and connecting the other flange of the engine compensator 6 with the flange of the diesel engine;
s10: removing the compensator 6 dummy, compressing the compensator 6 using a compression tool, inserting a seal between the compensator 6 and the flange of the adjacent component, holding the compensator 6 in a predetermined position; the compression tool is loosened and removed, the compensator 6 flange is moved toward the mating surface, and fasteners are used to fixedly attach the compensator 6 flange to the flange of the adjacent component. The compensator 6 dummy is conformal to the compensator 6. The compression tool comprises a threaded rod 9, two compensator chucks 10 are arranged on the threaded rod 9 in a sliding mode, round holes 11 with the hole diameters larger than the outer diameter of threads on the threaded rod 9 are formed in the compensator chucks 10, two adjusting nuts 12 are matched with the threaded rod 9 and are arranged close to two ends of the threaded rod 9, and the two compensator chucks 10 are arranged between the two nuts 12.
The diesel engine adopts a model of 12V 2000M 96L in the north sea of Jiangyin, and the parameters are as follows: power 1432, engine speed 2450, exhaust flow 5.0m3The exhaust temperature is 560 ℃, the exhaust pressure (designed) is 30mbar, the exhaust pressure (maximum) is 85mbar, the cylinder number is 12, and the outlet of the engine compensator is 1 outlet;
during the cooling process, the initial injection of seawater causes wide variations in the exhaust energy. The temperature of the cooling water is not a critical factor for cooling the exhaust gas, since a major part of this energy transfer is the result of evaporation of the injected seawater. The temperature of the cooling water is increased by 5C, and the necessary amount of seawater is only increased by about 0.9%. In this case, the engine rated power is P1432 [ Kw ]. exhaust cooling is maintained to about 1. When the engine is fully loaded, the exhaust system of the propulsion diesel engine has a temperature in the range of 60-70 ℃ and 50 liters per minute, while the maximum seawater flow should not exceed 120 liters per minute. The marine current is calibrated to a size in the range of 65 liters/minute at full engine load of the injector. The minimum required seawater supply pressure at the injector is 0.3bar or higher at any time for any load situation on the engine. Note that: the injector design pressure was 2.5 bar. Not to exceed this value! Exhaust velocities in various systems are determined by the engine manufacturer's recommended exhaust backpressure levels. The exhaust velocity for the dry section of the exhaust system used to propel the diesel engine will be 48-52 meters/second. For part of the downstream water injection, the exhaust velocity will be in the range of 28-31 m/s. The downstream main injector, which calculates the exhaust velocity, is an effective mixture to cool the exhaust, injecting seawater and water vapor to about 60-70 ℃.
Radiating when each system operates normally, wherein the following conditions are adopted during normal operation:
q Heat flow [ W ]
h thermal coefficient assumed to be 14W/m 2K
Assuming a cabin air flow velocity of 1m/s
Tm constant temperature air cabin 30 DEG C
Surface temperature of Te exhaust component is 70 DEG C
A surface area 16,06m2
Suppose air is h 12 √ (1) +2 ≈ 14
Q＝h A(Te-Tm)
Q＝89936W＝9kW
Each system stops heating during emergency operation (loss of seawater cooling) when the following conditions are present:
q Heat flow [ W ]
h thermal coefficient hypothesis 14W/m 2K
Assuming an air flow velocity of 1m/s in the cabin
Tm constant temperature air cabin 30 DEG C
Surface temperature of Te exhaust component 560 DEG C
A surface area 1606m2
Suppose air is h 12 √ (1) +2 ≈ 14
Q＝h A(Te-Tm)
Q＝1191652W＝1191kW；
The flange connection mode between each adjacent part or adjacent pipe fittings is as follows:
temporarily fixing the flange connecting position by using three sets of fasteners to ensure that the positions of the fasteners can be hermetically installed between the flanges, and then screwing the nuts;
distance elements, for example rectangular metal bars of 32 x 5 x 250mm, are used in order to create the necessary space between the flanges for a sealed installation. The sealing thickness is 2 mm; carefully insert seals according to the relevant item list and assembly drawing. Ensuring that there is no contact between the distance element and the sealing element; securing the position of the seal using four sets of fasteners, and then removing the distance piece; the remaining fasteners are installed and tightened by hand.
The installation of the outlet pipe with interface flange to the hull penetration assembly is as follows:
and providing an outlet pipe with an interface flange to be placed at the ship body penetration installation position. And matching the interface flange surface with the hull penetration flange surface. Note that the associated seals, both per item list and assembly drawing, must be installed in the same order. And (3) temporarily fixing the water outlet pipe and the ship body by using three sets of fasteners, wherein the specific position is the position of an interface flange penetrated by the ship body. The bolts were tightened by hand. It is checked whether the outlet pipe connected to the interface flange penetrated by the hull is in the correct position. The remaining fasteners are used and pulled tight.
Installation of compensator
After replacement of the compensator dummy with the compensator, the seal will be installed later in the installation. Providing a relevant dummy of the installation site. Matching the flange surface of the dummy flange with the flange surface of the water outlet pipe; note that the compensator will be installed with the associated seals according to the project list and assembly drawing. Use the associated fasteners and tighten them by hand. The fastener is tightened. The load carrying capacity of the bolt is not exceeded. Note that the remaining fasteners will be used during replacement of the compensator dummy.
The second exhaust pipe is mounted as follows:
providing the second exhaust pipe to the mounting location. And matching the flange surface of the false flange with the flange surface of the second exhaust pipe. And the compensator is required to be inserted into a relevant seal according to an item list and an assembly drawing when being installed. Use the associated fasteners and tighten them by hand. The fastener is tightened. The load carrying capacity of the bolt is not exceeded. Note that the remaining fasteners will be used during replacement of the compensator dummy.
The bulkhead penetration assembly is mounted as follows:
bulkhead penetration seals on the flanges are drawn from the exhaust pipe. With the help of liquid soap, the seal is placed correctly according to the current drawings. The separation flanges were placed on both sides of the seal and secured in place with three sets of fasteners. The bolts were tightened by hand. Check if the bulkhead penetration seal is in the correct position. The remaining fasteners are used and pulled tight.
The main silencer assembly is installed by the following steps:
the main muffler is provided to the mounting location. And matching the flange surface of the main silencer with the flange surface of the second exhaust pipe. The position of the main muffler is fixed by three sets of fasteners on the outlet side of this part. The position of the fasteners is ensured to enable a sealed mounting between the flanges. The seal thickness was 2 mm. The nut is tightened by hand. And inserting the relevant stamp according to the item list and the assembly drawing. It is checked whether the main muffler is in the correct position. The remaining fasteners are used and pulled tight.
The flexible support is installed by the following steps:
the correct position of the aluminum element on the hull is found and marked for welding and adjustment, and the threaded rods are cut down if necessary. Note that after the flexible support element is properly installed, the threaded rod should be rotated at least 2 turns by the spin nut. The exhaust system is protected before the aluminum elements are welded to the hull. The aluminum element in the hull structure is correctly welded. The flexible bracket is tightened with a nut to properly position the exhaust system mounting component. It is checked whether the mounted component is in the correct position. The position of the mounting member is fixed by a counter nut.
The injector mounting steps are as follows:
providing a main injector to the installation location. And matching the flange surface of the main ejector with the flange surface of the main silencer. Three sets of fasteners are used on the outlet side of the assembly to secure the position of the main injector. The position of the fasteners is ensured to enable a sealed mounting between the flanges. The seal thickness was 2 mm. Screwing down by using a handle nut; check if the main injector is in the correct position, use four sets of fasteners to ensure the sealed position. The remaining fasteners are used and pulled tight.
The installation steps of the first exhaust pipe assembly are as follows:
and (5) detaching the engine compensator and placing the exhaust pipe number. The exhaust pipe is placed at the correct position according to the relevant layout. Three sets of fasteners were used at the outlet end of the assembly. The position of the fasteners is ensured to enable a sealed mounting between the flanges. The seal thickness was 2 mm. Screwing down by using a handle nut; the remaining fasteners are used and hand tightened to mark the appropriate length at the entrance of the first exhaust duct. Note that this mounting step can only be performed if the main injectors are in the correct position according to the relevant engine outlet. The first exhaust pipe is cut off according to the mark. It is ensured that all openings in the engine and the exhaust system cover the inlet of the welding flange to the first exhaust pipe. Ensuring that all openings on the engine and exhaust system are properly covered and protecting the engine and exhaust system itself from weld spatter; and (5) mounting a false model of the engine compensator. Inserting fasteners between the compensator dummy flange and the manifold flange and engine flange to secure the position and tighten by hand; installing a related flexible supporting dummy; the position of the counter-cradle of the flexible support is defined. Welding the counter bracket to the container structure. Then inserting a fastener between the flexible dummy mould and the reverse bracket and screwing the fastener; note that the flexible support dummy should be put in place before the insulation pack installation is complete. This is recommended in order to properly install the remaining components. When the thermal insulation installation is carried out, the flexible supporting dummy is replaced by a corresponding flexible element and a corresponding gasket.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the technical principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The low infrared radiation exhaust system of the high-speed assault boat is characterized by comprising a first exhaust pipe, an ejector, a silencer assembly, a second exhaust pipe, a compensator and an outlet pipe which are sequentially connected; the ejector is composed of a double-wall pipe, the height of the pipe orifice of the double-wall pipe close to the silencer assembly is lower than that of the pipe orifice of the double-wall pipe far away from the silencer assembly, a nozzle socket is arranged on the double-wall pipe, and a nozzle retainer is arranged on the nozzle socket.
2. The high speed assault boat low infrared radiation exhaust system of claim 1 wherein at least two support members are provided on the first exhaust pipe, the ejector, the muffler assembly, the second exhaust pipe, the compensator and the outlet pipe, the support members having one end fixedly attached to the hull and the other end attached to the exhaust system.
3. The low ir emission exhaust system of claim 2, wherein the first exhaust pipe is connected to the engine via a flexible bellows, the first exhaust pipe is made of stainless steel AISI 316L, and the sealing member at the outlet of the first exhaust pipe is made of graphite.
4. The high speed assault boat low infrared radiation exhaust system of claim 3 wherein the injector is made using ASTM titanium alloy grade 2 material.
5. The high speed assault boat low infrared radiation exhaust system of claim 4 wherein the muffler assembly is secured to the ship structure by a flexible support; and the surface of the first exhaust pipe is coated with a heat insulation layer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112253296A (en) * | 2020-10-09 | 2021-01-22 | 江阴市北海救生设备有限公司 | Low-infrared radiation exhaust system of high-speed assault boat and installation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112253296A (en) * | 2020-10-09 | 2021-01-22 | 江阴市北海救生设备有限公司 | Low-infrared radiation exhaust system of high-speed assault boat and installation method thereof |
| CN112253296B (en) * | 2020-10-09 | 2022-02-25 | 江阴市北海救生设备有限公司 | Method for installing low-infrared radiation exhaust system of high-speed assault boat |
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