CN114688105A - Multistage auxiliary pressurizing ship water supply device - Google Patents
Multistage auxiliary pressurizing ship water supply device Download PDFInfo
- Publication number
- CN114688105A CN114688105A CN202210385235.1A CN202210385235A CN114688105A CN 114688105 A CN114688105 A CN 114688105A CN 202210385235 A CN202210385235 A CN 202210385235A CN 114688105 A CN114688105 A CN 114688105A
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- jet pump
- stage
- inlet pipe
- flow inlet
- stage jet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/24—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing liquids, e.g. containing solids, or liquids and elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
Abstract
The invention discloses a multistage auxiliary supercharging ship water supply device, which comprises an N-stage jet pump, wherein N is more than or equal to 2, a scheme of increasing injection capacity and injection ratio by using steam spiral jet is adopted, a multistage boosting scheme is adopted, a steam-water jet device is firstly adopted to realize preliminary boosting, then high-pressure water is further used for injecting water supply, high-flow water supply injection is realized, in addition, a spiral jet mode is adopted to realize sufficient steam-water contact, and the injection capacity is fully released; through regulating and controlling the injection ratio of the multistage injection devices, all the injection devices are at the working point with lower vibration noise, and the reduction of the total vibration noise is realized.
Description
Technical Field
The invention belongs to the field of steam power of an ocean platform, and particularly relates to a multistage auxiliary pressurizing ship water supply device.
Background
The steam power system is one of the main power modes of ocean platforms such as large ships, the water supply system is an important subsystem of the steam power system and plays a role in providing high-pressure water and the like which meet requirements for a steam generating device, the traditional water supply system comprises a water supply pump, a regulating valve, a pipeline and the like, wherein the pressurization function is completed by the water supply pump, the requirement of energy supply of the large ships is maintained, the circulation efficiency is considered, the water supply pressure is usually higher, the flow rate and the lift of the water supply pump are high, the load of the water supply pump is large, the water supply pump and a matched driving mechanism of the water supply pump are large in size, the vibration noise generated by the water supply pump is high in size, the comfort of the ocean platforms is seriously influenced, and meanwhile, the vibration noise is transmitted to the ocean environment to cause noise pollution, and the direction which needs to be regulated and controlled is important; and because the pipe network is complex, it is often a weak link in reliability. How to simplify the water supply system, improve the compactness and reliability of the water supply system, and reduce the system noise is a key point and a difficulty point of the current research design.
At present, one-stage injection is adopted, the pressure of a high-flow aqueous medium in a single-stage injector is relatively improved, the realization difficulty is high, the equipment is complex, the steam-water contact interface of the traditional injector is limited, the injection capacity is difficult to fully release, on the other hand, the single-stage injection process is difficult to regulate and control, and although the noise characteristic line spectrum is not prominent, the total sound pressure level is relatively high.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a multistage auxiliary pressurizing ship water supply device, which solves the problem of high system noise of a water supply system.
In order to achieve the purpose, the invention provides a multistage auxiliary supercharged ship water feeding device, which comprises N stages of jet pumps, wherein N is more than or equal to 2, the first stage of jet pump comprises a first stage of jet pump drained inlet pipe, a first stage of jet pump mixing chamber, a first stage of jet pump throat, a first stage of jet pump diffuser and a first stage of jet pump outlet which are sequentially communicated, a first stage of jet pump working flow inlet pipe is arranged in the first stage of jet pump drained inlet pipe, the tail end of the first stage of jet pump working flow inlet pipe in the fluid flow direction is positioned in the first stage of jet pump mixing chamber, the tail end of the first stage of jet pump working flow inlet pipe is connected with a first stage of jet pump working flow inlet pipe nozzle, the outer wall at the front end of the first stage of jet pump working flow inlet pipe is connected with a plurality of branch pipes, and the branch pipes are communicated to the first stage of jet pump mixing chamber in the fluid flow direction, the tail end of the branch pipe is connected with a branch pipe nozzle, and the downstream of the branch pipe is spirally wound around the working flow inlet pipe of the first-stage jet pump;
the N-stage jet pump comprises an N-stage jet pump working flow inlet pipe, an N-stage jet pump mixing chamber, an N-stage jet pump throat pipe and an N-stage jet pump outlet which are sequentially communicated, wherein an N-stage jet pump drainage inlet pipe is arranged in the N-stage jet pump working flow inlet pipe, the tail ends of the N-stage jet pump working flow inlet pipe and the N-stage jet pump drainage inlet pipe in the fluid flow direction are both positioned in the N-stage jet pump mixing chamber, and an N-stage jet pump working flow inlet pipe nozzle is arranged at the tail end of the N-stage jet pump working flow inlet pipe;
and the high-pressure condensate water after being boosted in the N-1 th-stage jet pump flows into the working flow inlet pipe of the N-1 th-stage jet pump through the outlet of the N-1 th-stage jet pump.
Preferably, the branch nozzle is a laval nozzle.
Preferably, the branch pipe is provided with a break point, and the branch pipe nozzle gradually approaches to the extension of the first-stage jet pump working flow inlet pipe nozzle along the fluid flow direction.
Preferably, the included angle between the nozzle direction of the branch pipe nozzle and the axial direction of the working flow inlet pipe of the first-stage jet pump is 15-45 degrees
Preferably, the distance between the branch pipe nozzle and the axis of the first-stage jet pump working flow inlet pipe is greater than the outlet diameter of the first-stage jet pump working flow inlet pipe nozzle.
Preferably, the branch pipe nozzle is 10-100mm deeper into the first stage jet pump mixing chamber than the first stage jet pump working fluid inlet pipe.
Preferably, the nth stage jet pump working fluid inlet pipe nozzle is a spiral nozzle.
The invention provides a multistage auxiliary pressurizing ship water supply device which has the following beneficial effects:
1. high-pressure steam as working fluid of the first-stage jet pump enters a first-stage jet pump working flow inlet pipe, condensed water is guided to enter a first-stage jet pump guided inlet pipe, partial condensed water is boosted by utilizing the steam-water jet, spiral jet flow is formed by utilizing a branch pipe, the steam is accelerated to a supersonic speed state in a branch pipe nozzle, on one hand, the steam-water contact area is increased, the ejecting capacity is enhanced, on the other hand, the spiral jet flow enables the center to form a local low-pressure area, and the ejecting capacity to the condensed water is enhanced;
2. the branch pipe nozzle is deeper into the mixing chamber of the first-stage jet pump by 10-100mm than the working flow inlet pipe of the first-stage jet pump, and the distance between the branch pipe nozzle and the axis of the working flow inlet pipe of the first-stage jet pump is greater than the outlet diameter of the working flow inlet pipe nozzle of the first-stage jet pump, so that jet flow interference can be avoided, and the rotational flow boosting efficiency is improved;
3. the N-stage jet pump working flow inlet pipe nozzle uses a spiral nozzle to enhance the injection capacity;
4. injecting the condensate water flowing out of the drainage inlet pipe of the Nth-level jet pump in the Nth-level jet pump mixing chamber, boosting the pressure at high lift to obtain high-pressure condensate water after high flow boosting, solving the problem that only one-level jet pump is difficult to consider high lift and high flow condensate water injection, realizing high-efficiency boosting of the condensate water, improving boosting capacity, simultaneously realizing boosting of the high flow condensate water, and realizing the comprehensive optimization of boosting efficiency, injection noise and the like through adjusting the flow of high-pressure steam and distributing the condensate water in the jet pumps at all levels.
Drawings
Fig. 1 is a schematic structural diagram of a multistage auxiliary pressurized water supply device for a ship in embodiment 1.
Fig. 2 is a schematic structural diagram of a working flow inlet pipe and a branch pipe of the first-stage jet pump in this embodiment 1.
Fig. 3 is a longitudinal sectional view of the branch pipe nozzle in this embodiment 1.
In the figure:
1-a first stage jet pump working flow inlet pipe; 2-a first stage jet pump is guided to a drainage inlet pipe; 3-branch pipe; 4-first stage jet pump working flow inlet pipe nozzle; 5-a first-stage jet pump mixing chamber; 6-a first-stage jet pump throat; 7-first stage jet pump diffuser; 8-first stage jet pump outlet; 9-a second stage jet pump working flow inlet pipe; 10-a second-stage jet pump is guided to a drainage inlet pipe; 11-branch nozzles; 12-a second stage jet pump working stream inlet pipe nozzle; 13-a second stage jet pump mixing chamber; 14-a second stage jet pump throat; 15-second stage jet pump outlet.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
A multistage auxiliary supercharging ship water supply device uses a scheme of increasing injection capacity and injection ratio by steam spiral jet, simultaneously adopts a multistage boosting scheme, firstly adopts a steam-water jet device to realize preliminary boosting, then further injects water by high-pressure water to realize high-flow water supply injection, and in addition, adopts a spiral jet mode to realize sufficient contact of steam and water and fully release injection capacity; through regulating and controlling the injection ratio of the multistage injection devices, all the injection devices are at the working point with lower vibration noise, and the reduction of the total vibration noise is realized.
The multistage auxiliary supercharged ship water supply device comprises N-grade jet pumps, wherein N is more than or equal to 2, the outlets of the N-1-grade jet pumps are connected with the inlets of the N-grade jet pumps, the outlets of the first-grade jet pumps are connected with the inlets of the second-grade jet pumps, each first-grade jet pump comprises a first-grade jet pump working flow inlet pipe 1, a first-grade jet pump drainage inlet pipe 2, 4-8 branch pipes 3 (even number of branch pipes) and a first-grade jet pump working flow inlet pipe nozzle 4, the jet pump comprises a first-stage jet pump mixing chamber 5, a first-stage jet pump throat pipe 6, a first-stage jet pump diffuser 7 and a first-stage jet pump outlet 8, wherein a branch pipe nozzle 11 is arranged at one end, close to the first-stage jet pump mixing chamber 5, of a branch pipe 3, the branch pipe nozzle 11 is a Laval nozzle, the first half part of the branch pipe nozzle 11 is contracted to a narrow throat from big to small in the middle, and the narrow throat is expanded outwards from small to big. The branch pipe 3 is bent, the tail end of the branch pipe 3 is obliquely and eccentrically arranged with the first-stage jet pump working flow inlet pipe 1 in the mixing chamber, the branch pipe nozzle 11 is close to the first-stage jet pump working flow inlet pipe nozzle 4, and the branch pipe 3 is spiral around the first-stage jet pump working flow inlet pipe nozzle 4. The Nth-stage jet pump comprises an Nth-stage jet pump working flow inlet pipe, an Nth-stage jet pump drainage inlet pipe, an Nth-stage jet pump working flow inlet pipe nozzle, an Nth-stage jet pump mixing chamber, an Nth-stage jet pump throat pipe and an Nth-stage jet pump diffuser. High-pressure steam as working fluid of the first-stage jet pump enters a first-stage jet pump working flow inlet pipe 1, condensed water is guided to enter a first-stage jet pump guided flow inlet pipe 2, part of condensed water is boosted by utilizing steam-water jet, and spiral jet flow is formed by utilizing a branch pipe 3, so that the steam-water contact area is increased, the ejection capacity is enhanced, and the spiral jet flow enables the center to form a local low-pressure area, so that the ejection capacity of the condensed water is enhanced; the boosted condensed water is used as working fluid, and the rest non-boosted fluid is injected by the second-stage jet pump, so that the power consumption of the centrifugal water-feeding pump is reduced, the centrifugal water-feeding pump can be even cancelled, and the safety and reliability of the system are improved.
Example 1
As shown in fig. 1, the multistage auxiliary supercharging ship water supply device takes a two-stage jet pump boosting scheme as an example, the first-stage jet pump comprises a first-stage jet pump induced flow inlet pipe 2, a first-stage jet pump mixing chamber 5, a first-stage jet pump throat pipe 6, a first-stage jet pump diffuser 7 and a first-stage jet pump outlet 8 which are sequentially communicated. The center department is equipped with first order jet pump work flow inlet pipe 1 in first order jet pump quilt drainage import pipe 2, and first order jet pump work flow inlet pipe 1 is in first order jet pump mixing chamber 5 at the ascending end of working fluid flow direction, and the end of first order jet pump work flow inlet pipe 1 is frustum of a cone, is connected with first order jet pump work flow inlet pipe nozzle 4 at the end of first order jet pump work flow inlet pipe 1. The outer wall of the front end of a first-stage jet pump working flow inlet pipe 1 is connected with 4-8 branch pipes 3, the number of the branch pipes 3 is even, the branch pipes 3 are communicated to a first-stage jet pump mixing chamber 5 along the flow direction of working liquid, a branch pipe nozzle 11 is arranged at one end, close to the first-stage jet pump mixing chamber 5, of each branch pipe 3, the branch pipe nozzle 11 is a Laval nozzle, the front half part of the branch pipe nozzle 11 is contracted to a narrow throat from big to small towards the middle, the narrow throat is expanded outwards from small to big, and therefore the branch pipe nozzle 11 is a supersonic nozzle. The branch pipe is provided with a break point, the downstream of the branch pipe is spirally wound around the working flow inlet pipe 1 of the first-stage jet pump, the tail end of the branch pipe is obliquely and eccentrically arranged with the working flow inlet pipe 1 of the first-stage jet pump in the mixing chamber 5 of the first-stage jet pump, so that the branch pipe nozzle 11 is gradually close to the extension of the working flow inlet pipe nozzle 4 of the first-stage jet pump, and the included angle between the nozzle direction of the branch pipe nozzle 11 and the axial direction of the working flow inlet pipe 1 of the first-stage jet pump is 15-45 degrees; the branch pipe is spiral around the first-stage jet pump working flow inlet pipe nozzle 4, steam in the branch pipe forms spiral jet flow after being jetted into the first-stage jet pump mixing chamber 5, wherein the branch pipe nozzle 11 is deeper into the first-stage jet pump mixing chamber by 10-100mm than the first-stage jet pump working flow inlet pipe 1, the distance between the branch pipe nozzle 11 and the first-stage jet pump working flow inlet pipe 1 axis is larger than the outlet diameter of the first-stage jet pump working flow inlet pipe nozzle 4, jet flow interference can be avoided, and therefore the spiral flow boosting efficiency is improved.
The diameter of the throat 6 of the first-stage jet pump is smaller than the drained inlet pipe 2 and the outlet 8 of the first-stage jet pump, and the mixing chamber 5 of the first-stage jet pump and the diffuser 7 of the first-stage jet pump are both in a cone frustum shape.
High-pressure steam from a steam generating device enters from a working flow inlet pipe 1 of a first-stage jet pump, condensed water flows in from the first-stage jet pump by a flow guide inlet pipe 2, part of the steam enters a branch pipe and then forms spiral jet flow from a branch pipe nozzle 11 and flows out, the steam is accelerated to a supersonic speed state in the branch pipe nozzle 11, on one hand, the steam-water contact area in a mixing chamber 5 of the first-stage jet pump is increased, the injection capacity is enhanced, the injection efficiency is improved, the boosting capacity is improved, on the other hand, the spiral jet flow enables a center to form a local low-pressure area, and the injection capacity of the condensed water is enhanced; and taking the boosted high-pressure condensate water as working fluid of the second-stage jet pump, and allowing the working fluid to enter the second-stage jet pump through the throat 6 of the first-stage jet pump, the diffuser 7 of the first-stage jet pump and the outlet 8 of the first-stage jet pump.
The second-stage jet pump comprises a second-stage jet pump working flow inlet pipe 9, a second-stage jet pump mixing chamber 13, a second-stage jet pump throat pipe 14 and a second-stage jet pump outlet 15 which are sequentially communicated, a second-stage jet pump drainage inlet pipe 10 is arranged at the central position of the second-stage jet pump working flow inlet pipe 9, the second-stage jet pump working flow inlet pipe 9 and the second-stage jet pump drainage inlet pipe 10 are both located in the second-stage jet pump mixing chamber 13 at the tail end of the liquid flow direction, a second-stage jet pump working flow inlet pipe nozzle 12 is arranged at the tail end of the second-stage jet pump working flow inlet pipe 9 in the working flow direction, and the second-stage jet pump working flow inlet pipe nozzle 12 uses a spiral nozzle to enhance the injection capacity.
The high-pressure condensate water after boosting enters a second-stage jet pump working flow inlet pipe 9 as second-stage jet pump working fluid, the second-stage jet pump is introduced with condensate water in a drainage inlet pipe 10, the high-pressure condensate water is spirally sprayed out through a second-stage jet pump working flow inlet pipe nozzle 12, the condensate water flowing out of the second-stage jet pump by the drainage inlet pipe 10 is injected in a second-stage jet pump mixing chamber 13, the high-lift boosting is realized, the high-pressure condensate water after high-flow boosting is obtained, the problem that only one-stage jet pump is difficult to consider high-lift injection and high-flow condensate water injection is solved, the efficient boosting of the condensate water is realized, the boosting capacity is improved, meanwhile, the boosting of the high-flow condensate water is realized, the high-pressure steam flow can be adjusted, the distribution of the condensate water in the jet pumps at different stages is realized, and the comprehensive optimization of boosting efficiency, injection noise and the like is realized. The high-pressure condensate water after the large flow rate and the pressure increase is sprayed out through the second-stage jet pump throat pipe 14 and the second-stage jet pump outlet 15. The rest non-pressurized condensate water is injected through the second-stage jet pump, so that the power consumption of the centrifugal water-feeding pump can be reduced, the centrifugal water-feeding pump for providing the condensate water can be even cancelled, and the safety and reliability of the system are improved.
The second-stage jet pump injects other non-pressurized fluid, so that the power consumption of the centrifugal water feed pump is reduced, the centrifugal water feed pump can be even cancelled, the condensed water pressurization without the help of rotating equipment is realized, and the safety and reliability of the system are improved.
The Nth-stage jet pump comprises an Nth-stage jet pump working flow inlet path, an Nth-stage jet pump drainage inlet pipe and an Nth-stage jet pump working flow inlet pipe nozzle.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (7)
1. A multistage auxiliary supercharged ship water feeding device is characterized by comprising N stages of jet pumps, wherein N is more than or equal to 2, the first stage of jet pump comprises a first stage of jet pump drainage inlet pipe, a first stage of jet pump mixing chamber, a first stage of jet pump throat pipe, a first stage of jet pump diffuser and a first stage of jet pump outlet which are sequentially communicated, a first stage of jet pump working flow inlet pipe is arranged in the first stage of jet pump drainage inlet pipe, the tail end of the first stage of jet pump working flow inlet pipe in the fluid flow direction is positioned in the first stage of jet pump mixing chamber, the tail end of the first stage of jet pump working flow inlet pipe is connected with a first stage of jet pump working flow inlet pipe nozzle, the outer wall of the front end of the first stage of jet pump working flow inlet pipe is connected with a plurality of branch pipes, and the branch pipes are communicated to the first stage of jet pump mixing chamber in the fluid flow direction, the tail end of the branch pipe is connected with a branch pipe nozzle, and the downstream of the branch pipe is spirally wound around the working flow inlet pipe of the first-stage jet pump;
the N-stage jet pump comprises an N-stage jet pump working flow inlet pipe, an N-stage jet pump mixing chamber, an N-stage jet pump throat pipe and an N-stage jet pump outlet which are sequentially communicated, wherein an N-stage jet pump drainage inlet pipe is arranged in the N-stage jet pump working flow inlet pipe, the tail ends of the N-stage jet pump working flow inlet pipe and the N-stage jet pump drainage inlet pipe in the fluid flow direction are both positioned in the N-stage jet pump mixing chamber, and an N-stage jet pump working flow inlet pipe nozzle is arranged at the tail end of the N-stage jet pump working flow inlet pipe;
and the high-pressure condensate water after being boosted in the N-1 th-stage jet pump flows into the working flow inlet pipe of the N-1 th-stage jet pump through the outlet of the N-1 th-stage jet pump.
2. The multi-stage booster marine water supply installation of claim 1, wherein the branch nozzles are laval nozzles.
3. The multi-stage booster marine water supply installation of claim 1, wherein the branch pipe is provided with a break point, and the branch pipe nozzle gradually approaches to the extension of the first-stage jet pump working flow inlet pipe nozzle along the fluid flow direction.
4. The multistage auxiliary pressurizing ship water feeding device according to claim 3, wherein an included angle between the nozzle direction of the branch pipe nozzle and the axial direction of the working flow inlet pipe of the first-stage jet pump is 15-45 degrees.
5. The multi-stage booster marine water supply installation of claim 3, wherein the branch pipe nozzle is spaced from the first stage jet pump working fluid inlet pipe axis by a distance greater than the outlet diameter of the first stage jet pump working fluid inlet pipe nozzle.
6. The multi-stage booster marine water supply installation of claim 1, wherein the branch pipe nozzles are located 10-100mm deeper into the first stage jet pump mixing chamber than the first stage jet pump working stream inlet pipe.
7. The multi-stage booster marine water supply installation of claim 1, wherein the nth stage jet pump working stream inlet pipe nozzle is a spiral nozzle.
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| CN202210385235.1A CN114688105A (en) | 2022-04-13 | 2022-04-13 | Multistage auxiliary pressurizing ship water supply device |
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| CN202210385235.1A CN114688105A (en) | 2022-04-13 | 2022-04-13 | Multistage auxiliary pressurizing ship water supply device |
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| CN115234524A (en) * | 2022-07-03 | 2022-10-25 | 中国船舶重工集团公司第七0三研究所 | Detachable low-noise steam jet compressor |
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