KR101953238B1 - Novec gas extigushing system design method - Google Patents

Novec gas extigushing system design method Download PDF

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KR101953238B1
KR101953238B1 KR1020160015861A KR20160015861A KR101953238B1 KR 101953238 B1 KR101953238 B1 KR 101953238B1 KR 1020160015861 A KR1020160015861 A KR 1020160015861A KR 20160015861 A KR20160015861 A KR 20160015861A KR 101953238 B1 KR101953238 B1 KR 101953238B1
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pressure
nozzle
pipe
fire extinguishing
gas fire
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KR20170094721A (en
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윤정인
김정환
김성윤
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재단법인한국조선해양기자재연구원
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    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C31/00—Delivery of fire-extinguishing material
    • A62C31/02—Nozzles specially adapted for fire-extinguishing
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C35/00—Permanently-installed equipment
    • A62C35/58—Pipe-line systems
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C35/00—Permanently-installed equipment
    • A62C35/58—Pipe-line systems
    • A62C35/64—Pipe-line systems pressurised
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62C—FIRE-FIGHTING
    • A62C37/00—Control of fire-fighting equipment
    • A62C37/50—Testing or indicating devices for determining the state of readiness of the equipment

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  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)

Abstract

According to one embodiment of the present invention, a method for designing a Novec gas fire extinguishing system comprising: a) input of piping information, a cylinder capacity, and a discharge coefficient of a nozzle by a user; b) a user entering a first pressure at the cylinder outlet; c) calculating the pressure of the tubing or the nozzle; d) calculating the discharge flow rate of the nozzle based on the discharge coefficient of the nozzle; e) recalculating the pressure of each of the pipes based on the discharge flow rate, and calculating a second pressure of the cylinder outlet; f) comparing the difference between the first pressure and the second pressure with a tolerance range; And g) outputting a calculation result when the difference between the first pressure and the second pressure is smaller than the tolerance range, and when the difference between the first pressure and the second pressure is greater than the tolerance range, and repeating steps b) to f), wherein the calculation result of step g) includes the release time of the Novec gas.

Description

Novek gas fire extinguishing system design method {NOVEC GAS EXTIGUSHING SYSTEM DESIGN METHOD}

The present invention relates to a method for designing a Norbek gas fire extinguishing system, and more particularly, a user inputs piping information, a cylinder capacity, and a discharge coefficient of a nozzle, calculates a discharge flow rate based on the first pressure, and calculates a discharge flow rate. The present invention relates to a method for designing a fire extinguishing system using Novec gas, which calculates a second pressure and compares the difference between the first pressure and the second pressure with a tolerance.

Recently, researches for analyzing problems of existing fire extinguishing facilities by using Novec Gas, which is known as an environmentally friendly fire extinguishing agent, have been attempted at home and abroad.

According to the national fire safety standards for gas fire extinguishing systems, the pipe size of the fire extinguishing system should be designed to release the extinguishing agent required for the extinguishing concentration within a specified time. In the case of carbon dioxide extinguishing systems, the global release time should be within 10 minutes for halogenated extinguishing systems and within 10 seconds for clean extinguishing agents. Gas-based fire extinguishing systems must meet various technical requirements such as extinguishing concentration, design concentration, discharge time and spray head minimum design pressure.

In addition, there are major issues to be solved in terms of fire safety as well as in the form of outward buildings, as well as the fire fighting system and the fundamental fire extinguishing agent. Of these, halon-based fire extinguishing agents used in the past are non-toxic and non-conductive, and have excellent extinguishing effects. Therefore, it is urgent to develop an eco-friendly, harmless human body and a high extinguishing agent. In the developed countries, the United States, Europe, and Japan, many efforts have been made to develop a new concept of clean extinguishing agent. Alternative extinguishing agents such as 1-1-, HFC-125 and HFC-227 have been developed. Novec gas is a fire extinguishing agent that has been recently developed according to the demand of the industry, and it is attracting attention as a next-generation environmentally friendly fire extinguishing agent as a fire extinguishing agent that almost completely compensates for the shortcomings of various clean extinguishing agents previously used.

However, the Noveg gas fire extinguishing device has a discharge time required to be completed before the Noveg gas converted into gaseous phase is liquefied again and is generally 10 seconds or less, which is very short compared to other clean extinguishing agents. It is essential to design the piping system considering the discharge time requirement. However, since Novek has a relatively short period of application in the industry, design criteria have not been proposed for the design of piping systems.

The technical problem to be achieved by the present invention is to solve the problem that the design criteria are not presented in connection with the design of the piping system of the Norbeck gas fire extinguishing system.

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned above may be clearly understood by those skilled in the art from the following description. There will be.

In order to achieve the above technical problem, an embodiment of the present invention is a method for designing Novek gas fire extinguishing equipment, a) a step of inputting piping information, cylinder capacity and the discharge coefficient of the nozzle by the user; b) a user entering a first pressure at the cylinder outlet; c) calculating the pressure of the tubing or the nozzle; d) calculating the discharge flow rate of the nozzle based on the discharge coefficient of the nozzle; e) recalculating the pressure of each of the pipes based on the discharge flow rate, and calculating a second pressure of the cylinder outlet; f) comparing the difference between the first pressure and the second pressure with a tolerance range; And g) outputting a calculation result when the difference between the first pressure and the second pressure is smaller than the tolerance range, and when the difference between the first pressure and the second pressure is greater than the tolerance range, and repeating steps b) to f), wherein the calculation result of step g) includes the release time of the Novec gas.

In addition, in one embodiment of the Novek gas fire extinguishing facility design method of the present invention, the pipe information of the a) step, the length of the pipe, the pipe diameter, the start point of the pipe, the end point of the pipe, the time point of the pipe And it may include a height difference of the end point of the pipe, the number of elbows, the presence or absence of a direct current or flow tee or a connection method.

In addition, in one embodiment of the Novek gas fire extinguishing facility design method of the present invention, the discharge coefficient of the nozzle of the step a) can be calculated using the following equation (1).

[Equation 1]

Figure 112018041365967-pat00001
(Q = flow rate, K = discharge coefficient of nozzle, P = pressure at nozzle)

In addition, in one embodiment of the Novek gas fire extinguishing facility design method of the present invention, the calculation result of step g) may include the pressure of the pipe or the nozzle.

Another embodiment of the present invention provides a Novec gas fire extinguishing system designed by the above-described Novek gas fire extinguishing facility design method.

Yet another embodiment of the present invention provides a marine plant including the above-described Novec gas fire extinguishing system.

According to the embodiment of the present invention, in the design of the piping system of the Norbek gas fire extinguishing equipment can be provided an effect that can be efficiently designed to obtain an efficient fire extinguishing system by obtaining the accurate discharge time and the discharge pressure.

The effects of the present invention are not limited to the above-described effects, but should be understood to include all the effects deduced from the configuration of the invention described in the detailed description or claims of the present invention.

1 is a flow chart according to an embodiment of the present invention.
Figure 2 is a schematic diagram of a pipe network showing an embodiment of the present invention.
Figure 3 is a schematic diagram of a pipe network showing an embodiment of the present invention.
Figure 4 is a schematic diagram of a pipe network showing an embodiment of the present invention.
5 is a schematic diagram of a pipe network showing an embodiment of the present invention.
6 is a table calculating information of a pipe network according to an embodiment of the present invention.
7 is a table showing the results of calculating the pressure in the nozzle of the pipe network according to an embodiment of the present invention.
8 is a table showing the results of calculating the pressure between the nodes of the pipe network and each node according to an embodiment of the present invention.
9 is a table showing the results of calculating the extinguishing agent release time of the Norbek gas fire extinguishing system according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, coupled)" with another part, it is not only "directly connected" but also "indirectly connected" with another member in between. "Includes the case. In addition, when a part is said to "include" a certain component, this means that it may further include other components, without excluding the other components unless otherwise stated.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. As used herein, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

One embodiment of the present invention is a method for designing a Norbek gas fire extinguishing system, first, a step (s10) in which piping information, a cylinder capacity, and a discharge coefficient of a nozzle are input by a user; (S20), the third step, calculating the pressure of the pipe or nozzle based on the pipe information, the cylinder capacity, the discharge coefficient of the nozzle and the first pressure (s30), fourth, the discharge coefficient of the nozzle based on the discharge coefficient of the nozzle Calculating the discharge flow rate (s40), fifth, recalculating pressure of each pipe based on the discharge flow rate, calculating the second pressure of the cylinder outlet portion (s50), and sixth, the first pressure and the second pressure Comparing the difference with the tolerance range (s60), or outputting the calculation result when the tolerance range is small or repeating the second to fifth steps when the tolerance range is large (s70). Scoop It provides nobek gas fire extinguishing system design method as.

Noveggas is present in the liquid state at atmospheric pressure, but it is vaporized with some heat energy, is very easy to store and transport compared to the standard clean extinguishing agent, and the temperature change is very small when the extinguishing system is operated. Can be utilized. However, since the extinguishing action of the Novec gas fire extinguisher must be completed before the gas transformed into the gas phase is liquefied, the required emission time is generally 10 seconds or less, which is very short compared to other clean extinguishing agents. However, it may be necessary to design a piping system that takes these discharge times into account. One embodiment of the present invention relates to the development of piping system design criteria in the industrial application of Novec gas may be a method of designing the Novek gas fire extinguishing equipment applied to the gas fire extinguishing device used in offshore plants and ships, Of course, it can be applied.

Novek gas fire extinguishing facility design method according to an embodiment of the present invention can be confirmed through the flow chart shown in FIG. In order to develop the piping system design technology of the Novec gas fire extinguishing system, the pipe network analysis technique should be applied. An algorithm representing an embodiment of the present invention using a pipe network analysis technique will be described in detail.

First, there is a step (s10) of inputting the piping information, the cylinder capacity and the discharge coefficient of the nozzle. Piping information may include the length of the pipe, the diameter of the pipe, the time of the pipe, the end of the pipe, the difference in the height of the pipe and the end of the pipe, the number of pipe fittings such as elbows, the presence or absence of DC or flow tee or connection method. . Of course, it is not limited to this. Equation 1 may be used to calculate the discharge coefficient of the nozzle.

[Equation 1]

Figure 112018041365967-pat00002
(Q = flow rate, K = discharge coefficient of nozzle, P = pressure at nozzle)

Then, there is a step (s20) in which the user inputs the first pressure. The first pressure may be the pressure of the cylinder outlet. The pressure of the cylinder outlet is stored in the cylinder at high pressure, but when the cylinder outlet is opened, the cylinder outlet is passed through the valve of the cylinder and vaporized by frictional heat from the valve to be discharged as a gas. Can be.

Next, there is a step (s30) of calculating the pressure of the pipe or the nozzle based on the first pressure.

Then, there is a step (s40) of calculating the discharge flow rate of the nozzle.

Then, there is a step (s50) of recalculating the pressure of each pipe based on the discharge flow rate from the nozzle and calculating the second pressure of the cylinder outlet.

Next, there is a step (s60) of calculating the difference between the first pressure and the second pressure by the allowable error range (s60) and outputting the calculation result (s70). In this case, if the difference between the first pressure and the second pressure is smaller than the allowable error range, the calculation result is output. If the difference between the first pressure and the second pressure is larger than the allowable error range, the above-described steps may be repeated. have. That is, the step of calculating the second pressure from the step of inputting the first pressure may be repeatedly performed, and the difference between the first pressure and the second pressure may be smaller than the allowable error range to output the calculation result.

Figure 2 is a schematic diagram of a pipe for showing an embodiment of the present invention. The pipe network of FIG. 2 is for showing a pipe network of a simple structure and does not exclude other pipe networks. 1 to 4 in FIG. 2 are node numbers showing contact points of respective pipes. The flow loss generated in the pipe network can be calculated by considering the energy balance at each pipe connection point. The pressure loss at nodes 1, 2, 3, and 4 in the pipe network of FIG. 2 is briefly represented by Equations 2 to 4 below.

[Equation 2]

P 1 -P 2 = F 12

Figure 112016013741614-pat00003
,

[Equation 3]

P 2 -P 3 = F 23

Figure 112016013741614-pat00004
,

[Equation 4]

P 2 -P 4 = F 24

Figure 112016013741614-pat00005

P 1- , P 2 , P 3 , and P 4 represent the pressure of each node. The superscript n in Equations 2 to 4 may be 1.85 for Hazen-Williams and 2 for Darcy-Weisbach. The pressure P 2 of node 2, which is the connection point of each pipe, may have the same value even when the flow loss is calculated in the 1-2, 2-3, 2-4 pipes. In this case, if the pressure and flow rate at any one point are known, the flow rate and pressure at the remaining pipe and each point can be calculated. In addition, the pressure and flow rate at any one node must be given as boundary conditions in order to calculate the pressure and flow rate for the entire pipe.For the water mist and sprinkler fire extinguishing systems, Remote Nozzle) can be given as boundary condition. That is, the flow rate or pressure required at the remotest nozzle may be determined according to various laws or regulations. When the flow rate or pressure is determined, the flow rate or pressure may be utilized by using the characteristic coefficient K of the nozzle. Can be calculated The characteristic coefficient of the nozzle can be obtained using Equation 1 above.

In addition, when calculating pumps, the remotest nozzle cannot be used as the boundary condition, so any nozzle is assumed to be the remotest nozzle and the predetermined pressure is assumed to be used for the pump. Calculate the pressure and flow rate of the nozzle, and continuously vary the pressure at the remotest nozzle, using the method described above to calculate the flow and pressure at the entire pipe network and each nozzle based on the pump performance. .

It will be described in detail with reference to Figure 3 which is a schematic diagram of a pipe network for showing an embodiment of the present invention. Each of the nodes illustrated in FIGS. 3 to 5 represents 100 to 106 for contact points or break points of the pipes, and 201 to 206 for nozzles. 4 and 5 are for comparing the relationship between the nozzle and the discharge time compared to the calculation result for the pipe network of FIG.

Using the Novek gas fire extinguishing system design method of the present invention, the results of calculating the discharge time and the pressure at each nozzle and pipe for the Norbek gas fire extinguishing device of FIG. 3 are shown in FIGS. 7 to 8. In FIG. 8, ND is a nominal diameter, Sch is a schedule representing a grade of pipe wall thickness, L is length of pipe, Elv is pipe height change, Elb is Elbow, L-Elb is L-Elbow and Node. (s) is the node starting from the point of contact of the pipe network, Node (e) is the end of the point of contact of the pipe network, P_s is the pressure of the node at which the flow starts from the point of contact of the pipe network, and P_e is the pressure of the end of the flow of the contact point of the pipe network. , dP is the difference between the pressure at the node where the flow begins and the pressure at the node where the flow ends. In addition, Figure 6 is a table showing the initial conditions of the Novek gas fire extinguishing facility design method according to an embodiment of the present invention. When the result shown in FIG. 7 is confirmed, the pressure in each nozzle can be confirmed. In FIG. 7, the pressure at each nozzle means a second pressure when the difference between the first pressure and the second pressure is within a tolerance according to an embodiment of the present invention. When the result shown in FIG. 8 is confirmed, the pressure between each node, ie, the pressure of a piping, can be confirmed. According to an embodiment of the present invention, in order to perform the step (s10) of inputting the pipe information, the cylinder capacity and the discharge coefficient of the nozzle by the user (s20) and the user inputs the first pressure of the cylinder outlet (s20). Inputting the initial information shown in 6, calculating the pressure of the pipe or nozzle based on the pipe information, cylinder capacity, nozzle discharge coefficient and the first pressure (s30), the discharge flow rate of the nozzle based on the discharge coefficient of the nozzle Calculating (s40), recalculating the flow rate and pressure of each pipe based on the discharge flow rate from the nozzle, and calculating the second pressure of the cylinder outlet portion (s50) of the first pressure and the second pressure By comparing the difference and the allowable error range, the above-described steps are repeated until the numerical value required in the design of the Novec gas fire extinguishing system is obtained, thereby obtaining the results shown in the tables shown in FIGS. 7 to 8. Can be.

 Through an embodiment of the present invention was examined the appropriateness by calculating the extinguishing agent discharge time which is a design factor of the Novek gas fire extinguishing system of the pipe network including the Norbek gas fire extinguishing system shown in FIGS. The results are shown in FIG. Checking the results, it can be seen that as the number of nozzles decreases, the extinguishing agent release time of the Novec gas fire extinguishing system increases. When the number of nozzles increases, the discharge time may decrease due to the discharge characteristics of the nozzle shown in Equation (1). When the number of nozzles is reduced in the Novek gas fire extinguishing system having the same piping system, more flow rate is introduced into each nozzle, and the discharge pressure at the nozzle may also increase. However, it is not possible to discharge the flow rate by the increased discharge pressure due to the discharge characteristics of the nozzle, and thus it is possible to discharge the Novec gas at a smaller flow rate than when there are many nozzles in the Novec gas cylinder for energy balance. For this reason, the reduction of the number of nozzles in the same pipe network can increase the discharge time in the Norbek gas fire extinguishing system. The Novek gas fire extinguishing system design method according to an embodiment of the present invention can be verified by verifying the Norbek gas emission time to design an efficient Norbek gas fire extinguishing system.

As another embodiment of the present invention, there is provided a Norbek gas fire extinguishing system designed by the method for designing a Norbek gas fire extinguishing system according to the above-described embodiment. The present invention also provides a marine plant including a Novec gas fire extinguishing system.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is represented by the following claims, and it should be construed that all changes or modifications derived from the meaning and scope of the claims and their equivalents are included in the scope of the present invention.

1, 2, 3, 4, 101, 102, 103, 104, 105, 106: points of contact of pipes
201, 202, 203, 204, 205, 206: nozzle

Claims (6)

In the design method of the Novec gas fire extinguishing system,
a) input of piping information, cylinder capacity and discharge coefficient of the nozzle by the user;
b) a user entering a first pressure at the cylinder outlet;
c) calculating the pressure of the tubing or the nozzle;
d) calculating the discharge flow rate of the nozzle based on the discharge coefficient of the nozzle;
e) recalculating the pressure of each of the pipes based on the discharge flow rate, and calculating a second pressure of the cylinder outlet;
f) comparing the difference between the first pressure and the second pressure with a tolerance range; And
g) if the difference between the first pressure and the second pressure is smaller than the tolerance range, a calculation result is output; and if the difference between the first pressure and the second pressure is greater than the tolerance range, b Repeating steps i) to f);
Including;
The calculation result of step g) comprises the release time of the Novec gas, Novek gas fire extinguishing equipment design method.
The method according to claim 1,
The pipe information of the a) step, the length of the pipe, the pipe diameter, the start point of the pipe, the end point of the pipe, the height difference between the start point of the pipe and the end point of the pipe, the number of elbows, direct current or flow The presence or absence of the connection method, Novek gas fire extinguishing system design method.
The method according to claim 1,
The discharge coefficient of the nozzle of the step a) is calculated using Equation 1, Novek gas fire extinguishing equipment design method.
[Equation 1]
Figure 112018041365967-pat00006
(Q = flow rate, K = discharge coefficient of nozzle, P = pressure at nozzle)
The method according to claim 1,
The calculation result of step g) comprises the pressure of the pipe or the nozzle, Novek gas fire extinguishing equipment design method.
Novek gas fire extinguishing system designed by any one of claims 1 to 4.
Offshore plant comprising the Novec gas fire extinguishing system of claim 5.
KR1020160015861A 2016-02-11 2016-02-11 Novec gas extigushing system design method KR101953238B1 (en)

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Publication number Priority date Publication date Assignee Title
KR101473978B1 (en) * 2012-11-28 2014-12-17 경민대학산학협력단 A Design Method for Carbon Dioxide Fire Extinguishing System and the System Designed with the Method

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* Cited by examiner, † Cited by third party
Title
윤정인, 최재혁. NOVEC 가스 소화 설비 설계방법론 개발. 한국마린엔지니어링학회지. 한국마린엔지니어링학회. 2015년 3월. pp.206-210 1부.*

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