CN111692027B - Design method for diesel engine generator set system pipeline - Google Patents

Design method for diesel engine generator set system pipeline Download PDF

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CN111692027B
CN111692027B CN202010577221.0A CN202010577221A CN111692027B CN 111692027 B CN111692027 B CN 111692027B CN 202010577221 A CN202010577221 A CN 202010577221A CN 111692027 B CN111692027 B CN 111692027B
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pipeline
elbows
design
length
maximum
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CN111692027A (en
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姜旭龙
朱泉良
张允富
姚琦
吴嘉舜
刘吉义
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CRRC Dalian Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0047—Layout or arrangement of systems for feeding fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
    • F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
    • F02M37/0017—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor related to fuel pipes or their connections, e.g. joints or sealings
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/14—Pipes
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
    • G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces

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  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
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Abstract

The invention discloses a design method of diesel engine generator set system pipeline, which determines the expected number of elbows required by the system pipeline according to the use environment; listing a relation equation between the number of the elbows and the length of the pipeline; obtaining the design quantity of the elbows and the maximum design length of the pipeline based on the relational equation; and arranging the pipelines based on the design quantity of the elbows and the maximum design length of the pipelines. The invention provides a definite calculation method according to definite parameters of selected diesel engines and the equipment of each system, determines the length of the pipeline and the quantity of the elbows of the pipeline, designs the pipeline of the system according to the calculation result, so that the design work is more convenient and easier, and the running of the unit is more reliable.

Description

Design method for diesel engine generator set system pipeline
Technical Field
The invention relates to the technical field of diesel generator design, in particular to a diesel generator set system pipeline design method.
Background
The diesel generator set is composed of a diesel engine, a generator, a cooling water system, a fuel oil system, an engine oil system and other parts. Each system is provided with its own sub-equipment, which are connected together by pipelines, and the pump of each system drives the medium in the system to circulate and flow. Because each sub-device and diesel engine of each system have strict pressure requirements, the bent pipe and the pipeline run length are inevitably generated when the pipelines are connected, the medium has strict pressure requirements when circularly flowing in each system, and the length of the sub-device, the bent pipe and the pipeline of each system can generate resistance, which has great influence on the pressure required by each system. The pressure of the diesel engine and the pressure of the sub-equipment of each system are fixed and cannot be changed, and the number of the elbows of the pipelines and the length of the trend of the pipelines need to be reasonably arranged in order to ensure the internal pressure of the system when the pump to which each system belongs normally works. Otherwise, the internal pressure of a certain system is insufficient, so that the running requirement of the unit cannot be met.
At present, the system design of the diesel generating set preferably meets the arrangement and trend of system pipelines, and whether the resistance of each system meets the requirement or not is calculated after the design is finished, or the system is designed according to experience. The resistance of the system is calculated after the pipeline arrangement and the trend of the system are finished, so that great repeatability is brought to the design work, the system needs to be redesigned if the calculation does not meet the design requirement, so that the repeatability of the design work is high, and meanwhile, the design is designed by experience sometimes only to expose the problem during application, so that the change is difficult, and great defects are brought to production and use. .
Based on this, the prior art still remains to be improved.
Disclosure of Invention
In order to solve the above technical problems, an embodiment of the present invention provides a method for designing a pipeline of a diesel engine generator set system, so as to solve the technical problems of repeated modification of pipeline arrangement and trend of the system in a design stage and tedious and repetitive work in the prior art.
The embodiment of the invention discloses a method for designing a pipeline of a diesel engine generator set system, which comprises the following steps:
s100, determining the expected number of elbows needed by a system pipeline according to the using environment;
s200, listing a relation equation between the number of the elbows and the length of the pipeline;
s300, obtaining the design quantity of the elbows and the maximum design length of the pipeline based on the relational equation;
s400, arranging the pipelines based on the design quantity of the elbows and the maximum design length of the pipelines.
Further, the relational equation is:
Figure BDA0002551635360000021
wherein the content of the first and second substances,
d-system pipeline internal diameter, w-system pump flow, rho-medium density,
fmcoefficient of on-way resistance, ζ -coefficient of local resistance, n1The same number of bends, n2-the same number of valves,
pamaximum external resistance allowed by the system pump, pc-system individual plant resistance, L-maximum design length of piping.
Further, the inner diameter of the system pipeline simultaneously satisfies the following conditions:
db≤d≤2db
wherein d isb-pump inlet diameter.
Further, the obtaining of the design quantity of the elbows and the maximum design length of the pipeline based on the relational equation comprises:
s301, substituting the predicted number of the elbows into the relational equation to calculate the maximum design length of the pipeline,
s302, if the maximum design length of the pipeline is larger than 5m, performing a step 400;
if the maximum design length of the pipeline is less than 5 meters, the expected number of the elbows required by the modification according to the use environment is repeated S301.
Further, the elbow is a 90 ° elbow.
By adopting the technical scheme, the invention at least has the following beneficial effects:
the invention provides a method for designing a pipeline of a diesel engine generator set system, which provides a definite calculation method according to definite parameters of selected diesel engines and equipment of each system, determines the length of the pipeline and the number of the elbows of the pipeline, designs the pipeline of the system according to the calculation result, and ensures that the design work is more convenient and easier and the running of the set is more reliable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for designing a diesel engine generator set system pipeline according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
As shown in fig. 1, some embodiments of the present invention disclose a method for designing a pipeline of a diesel engine generator set system, comprising:
s100, determining the expected number of elbows needed by a system pipeline according to the using environment;
s200, listing a relation equation between the number of the elbows and the length of the pipeline;
s300, obtaining the design quantity of the elbows and the maximum design length of the pipeline based on the relational equation;
s400, arranging the pipelines based on the design quantity of the elbows and the maximum design length of the pipelines.
According to the embodiment, the number of the elbows is predicted firstly, the maximum design length of the pipeline is obtained based on the relation between the number of the elbows and the length of the pipeline, and then subsequent pipeline arrangement is carried out, so that accurate data support is provided for pipeline arrangement, the arranged pipeline can definitely meet requirements, the pipeline arrangement is prevented from being carried out firstly, and the pipeline arrangement, the trend repeated modification, the repeated computation and other complex repetitive work brought by the repeated computation are avoided. The design work is more convenient and easier, and the unit operation is more reliable.
In some preferred embodiments of the present invention, based on the above embodiments, the relation equation is:
Figure BDA0002551635360000041
wherein the content of the first and second substances,
d-system pipeline internal diameter, w-system pump flow, rho-medium density,
fmcoefficient of on-way resistance, ζ -coefficient of local resistance, n1The same number of bends, n2-the same number of valves,
pamaximum external resistance allowed by the system pump, pc-system individual plant resistance, L-maximum design length of piping.
The relationship between the maximum design length L of the pipeline and the number of the elbows can be obtained according to the relational expression, and the number of the elbows of the pipeline and the maximum pipeline length can be easily determined according to the arrangement condition of each device, so that the clear system pipeline design is carried out.
In some preferred embodiments, in order to further ensure the temperature operation of the equipment, the inner diameter of the system pipeline simultaneously satisfies the following conditions:
db≤d≤2db
wherein d isb-pump inlet diameter. If the inner diameter of the system pipe is too small, the requirement of the pump may not be met, and the pump may be damaged, and if the inner diameter of the system pipe is too large, the required pressure may not meet the requirement.
In the method for designing a pipeline of a diesel engine generator set system disclosed in some embodiments of the present invention, on the basis of the above embodiments, obtaining the design number of elbows and the maximum design length of the pipeline based on the relational equation includes:
s301, substituting the predicted number of the elbows into the relational equation to calculate the maximum design length of the pipeline,
s302, if the maximum design length of the pipeline is larger than 5m, performing a step 400;
if the maximum design length of the pipeline is less than 5 meters, the expected number of the elbows required by the modification according to the use environment is repeated S301.
In the above embodiment of the present invention, the elbow is preferably a uniform 90 ° elbow. The technical scheme of the invention is that the quantity of the elbows is firstly specified based on the use field, so that the arrangement scheme suitable for the 90-degree elbows can be preferentially obtained, the calculation and the arrangement are simpler, and the pipeline stability and the installation are simpler and more convenient.
In some embodiments of the invention, a diesel generator set is composed of components such as a diesel engine, a generator, a cooling water system, a fuel system, an engine oil system and the like. When each system is designed, the part to which each system belongs is selected according to the selected information such as the model and parameters of the diesel engine, and the embodiment only takes a cooling water system as an example. According to the use environment of a user, a cooling water system needs to comprise the parts of a radiator, a heater, a stop valve and the like. According to the design parameters given by the diesel engine and the selected parts of the cooling water system, the following data are obtained: pump inlet diameter db: 70mm, diesel pump flow w: 43m3H, maximum allowable external resistance of pump pa: 90kPa, system plant resistances and pc: 40kPa, the number n of stop valves required2: 1. the system medium is water, and the water density at 50 ℃ by adopting the common temperature of the unit is as follows: 998.1kg/m3。
According to formula db≤d≤2dbSelecting the pipeline with the inner diameter d of 80mm, searching a design file to obtain the physical property parameters of the water with the temperature of 50 ℃, and calculating the on-way resistance coefficient f according to a fluid mechanics related formulam: local resistance coefficient zeta of 0.013, 90 degree elbow1: 1, local resistance coefficient ζ of stop valve2: 7, substituting the parameters into the formula:
Figure BDA0002551635360000061
to obtain
5<L≤65.9776-6.15n1
According to the formula, the required number of 90-degree elbows is 8 by combining the arrangement position of the unit equipment, and the maximum length of the pipeline does not exceed 16.78 meters.
In the above formulae dbPump inlet diameter, d-system line internal diameter, w-system pump flow, ρ -medium density, fmCoefficient of on-way resistance, ζ -coefficient of local resistance, n1The same number of bends, n2The same number of valves, paMaximum external resistance allowed by the system pump, pcSystem individual plant resistances.
The embodiment is only a water system, and other systems can be calculated and designed according to the method.
In summary, the method for designing the system pipeline of the diesel generator set disclosed by the embodiment of the invention can avoid the complex repetitive work of repeated modification of the arrangement and the trend of the system pipeline in the design stage. According to the definite parameters of the selected diesel engine and the equipment of each system, a definite calculation method is provided, the length of the pipeline and the number of the elbow of the pipeline are determined, and the pipeline of the system is designed according to the calculation result, so that the design work is more convenient and easier, and the operation of the unit is more reliable.
It should be particularly noted that the various components or steps in the above embodiments can be mutually intersected, replaced, added or deleted, and therefore, the combination formed by the reasonable permutation and combination conversion shall also belong to the protection scope of the present invention, and the protection scope of the present invention shall not be limited to the embodiments.
The above is an exemplary embodiment of the present disclosure, and the order of disclosure of the above embodiment of the present disclosure is only for description and does not represent the merits of the embodiment. It should be noted that the discussion of any embodiment above is exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to those examples, and that various changes and modifications may be made without departing from the scope, as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.

Claims (2)

1. A method for designing a pipeline of a diesel engine generator set system is characterized by comprising the following steps:
s100, determining the expected number of elbows needed by a system pipeline according to the using environment;
s200, listing a relation equation between the number of the elbows and the length of the pipeline;
s300, obtaining the design quantity of the elbows and the maximum design length of the pipeline based on the relational equation;
s400, arranging pipelines based on the design quantity of the elbows and the maximum design length of the pipelines;
the relational equation is as follows:
Figure FDA0003357719590000011
wherein the content of the first and second substances,
d-system pipeline internal diameter, w-system pump flow, rho-medium density,
fmcoefficient of on-way resistance, ζ -coefficient of local resistance, n1The same number of bends, n2-the same number of valves,
pamaximum external resistance allowed by the system pump, pc-system individual plant resistance, L-maximum design length of piping;
the inner diameter of the system pipeline simultaneously meets the following requirements:
db≤d≤2db
wherein d isb-a pump inlet diameter;
obtaining the design quantity of the elbows and the maximum design length of the pipeline based on the relational equation comprises the following steps:
s301, substituting the predicted number of the elbows into the relational equation to calculate the maximum design length of the pipeline,
s302, if the maximum design length of the pipeline is larger than 5m, performing a step 400;
if the maximum design length of the pipeline is less than 5 meters, the expected number of the elbows required by the modification according to the use environment is repeated S301.
2. The diesel engine power generation battery system piping design method of claim 1, wherein the elbow is a 90 ° elbow.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102243683A (en) * 2011-08-19 2011-11-16 泰戈特（北京）工程技术有限公司 Method and device for realizing pipeline design
CN104500283A (en) * 2014-11-26 2015-04-08 中国北车集团大连机车车辆有限公司 Multistage-heating oil supply device for heavy oil generator set and method of multistage-heating oil supply device
CN107449091A (en) * 2017-07-31 2017-12-08 湖南科技大学 A kind of drop resistance Optimization Design for collaborating three ventilation ducts

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US8301417B2 (en) * 2008-11-12 2012-10-30 The Boeing Company Method for identifying the analytical transitional cross-sections of a rigid transport element
TN2017000140A1 (en) * 2014-10-12 2018-10-19 Vincent Darrell L Apparatus and method for assembling measuring and monitoring integrity of mechanical pipe joints.

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
CN102243683A (en) * 2011-08-19 2011-11-16 泰戈特（北京）工程技术有限公司 Method and device for realizing pipeline design
CN104500283A (en) * 2014-11-26 2015-04-08 中国北车集团大连机车车辆有限公司 Multistage-heating oil supply device for heavy oil generator set and method of multistage-heating oil supply device
CN107449091A (en) * 2017-07-31 2017-12-08 湖南科技大学 A kind of drop resistance Optimization Design for collaborating three ventilation ducts

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基于最短路径快速算法的船舶管路自动敷设方法;董宗然;《计算机集成制造系统》;20141231;第2963-2971页 *

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