A heptafluoropropane foam fire extinguishing system fire extinguishing parameter testing device

Abstract

The utility model discloses a heptafluoro-propane foam fire extinguishing system fire extinguishing parameter testing arrangement, including the cooling water supply mechanism that provides cooling water for the sealed ring fire test model, the mixed solution supply mechanism that provides heptafluoro-propane foam mixed solution for the sealed ring fire test model and sealed ring fire test model, and sealed ring fire test model includes the body, the inner floating roof is installed the bottom of body, and the weir board is fixedly installed one side top of inner floating roof and forms a long side wall of body, and the baffle is installed the other long side wall top of body, and the body is used for holding the combustible liquid, and the combustible liquid is located the area between inner floating roof and side wall. The utility model discloses through the mutual cooperation of sealed ring fire test model, cooling water supply mechanism, mixed solution supply mechanism, can truly reflect sealed ring fire actual situation, can test heptafluoro-propane foam's fire extinguishing performance again, determines the fire extinguishing parameter, and has greater promoting effect to the safety level of promotion tank farm.

Description

Technical Field

[0001] This utility model relates to the field of fire protection equipment technology, specifically to a fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system. Background Technology

[0002] Heptafluoropropane foam fire suppression systems are primarily used for fire prevention and control in tanks storing flammable liquids, especially low-boiling-point flammable liquids. Currently, they are mainly used in low-pressure fixed-roof tanks storing low-boiling-point flammable liquids, such as propylene oxide fixed-roof tanks. The primary fire mode for fixed-roof tanks is full-surface fire. Based on relevant experimental research, the Chinese group standard "Technical Specification for Heptafluoropropane Foam Fire Suppression Systems" (CECS394:2015) specifies the design parameters for heptafluoropropane fire suppression systems used to prevent full-surface fires in storage tanks. In recent years, with technological advancements and environmental requirements, the types of tanks storing low-boiling-point flammable liquids have changed, with the adoption of steel single-pan or double-pan internal floating roof tanks. These tanks are generally designed for sealed-ring fires. Due to a lack of relevant experimental research, current standards and specifications do not include design parameters or testing methods for these tanks. The existing projects have mostly referenced the design parameters of ordinary air foam for extinguishing sealed ring fires, and selected a large safety factor, resulting in high economic costs for the fire extinguishing system, and the fire extinguishing effect has not been tested. Utility Model Content

[0003] This invention addresses the problems in the prior art by disclosing a fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system. Through the coordinated operation of the sealing ring fire testing mechanism, the cooling water supply mechanism, and the mixed liquid supply mechanism, this invention can not only accurately reflect the actual situation of a sealing ring fire, but also test the fire extinguishing performance of heptafluoropropane foam to determine the fire extinguishing parameters. Moreover, the determined design parameters are highly reliable, which greatly promotes the improvement of the safety level of tank farms.

[0004] This utility model is achieved through the following technical solution:

[0005] This utility model first provides a fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system, including a cooling water supply mechanism for providing cooling water to a sealed ring fire test model, a mixture supply mechanism for providing foam mixture to the sealed ring fire test model for fire extinguishing, and a sealed ring fire test model. The sealed ring fire test model includes a body, an inner floating roof installed at the bottom of the body, the inner floating roof being an inverted U-shaped groove structure welded to the bottom plate, a weir plate fixedly installed above one side of the inner floating roof to form a long side wall of the body, and the sum of the height of the weir plate and the height of the inner floating roof is equal to the height of the side wall, a baffle plate installed above the other long side wall of the body, the body being used to hold flammable liquid, and the flammable liquid being located in the area between the inner floating roof and the side wall.

[0006] As a further option, a heptafluoropropane foam generator is installed on the outside of the baffle, the heptafluoropropane foam generator pipeline is connected to the mixed liquid supply mechanism, a cooling water pipe is installed on the outside of the main body, and several water curtain nozzles are evenly distributed on the cooling water pipe. The cooling water pipe and the cooling water supply mechanism are connected.

[0007] As a further option, the cooling water supply mechanism has a gap of 0.2-0.5mm between the cooling water pipes and the outer wall of the main body.

[0008] As a further option, the flow coefficient of the water curtain nozzle is 5-20, and the water curtain angle is 90°-150°.

[0009] As a further option, the internal floating roof is an inverted U-shaped channel structure, with a distance of 0.2-0.4m between the internal floating roof and the sidewall.

[0010] As a further option, the foam generator is installed at the center of the top of the foam baffle.

[0011] As a further option, the sum of the height of the weir plate and the height of the inner floating roof is equal to the height of the sidewall.

[0012] As a further embodiment, the cooling water supply mechanism includes a water storage unit and a second water supply control valve. The water storage unit is connected to the second water supply control valve through a first water supply pipeline and a second water supply pipeline. The first water supply pipeline is installed sequentially from the water storage unit, along with a third water supply control valve, a water pump, a first water supply pressure gauge, a water supply check valve, and a fourth water supply control valve. The second water supply pipeline is equipped with a first water supply control valve, and the second water supply control valve is installed on a third water supply pipeline. The third water supply pipeline is equipped with a flow meter and a second water supply pressure gauge before being connected to the cooling water pipeline.

[0013] As a further embodiment, the mixture supply mechanism includes a mixture storage unit and a second control valve. The mixture storage unit is connected to the second control valve via a first pipeline and a second pipeline. The first pipeline, from the mixture storage unit, sequentially installs a fifth control valve, a fire pump, a first foam pressure gauge, a foam check valve, and a sixth control valve. The second pipeline installs a third control valve. The second control valve and a first foam flow meter are both installed on the third pipeline. The third, fourth, and fifth pipelines are all connected to a proportioning mixer. The fourth pipeline, from the proportioning mixer, sequentially installs a first control valve, a heptafluoropropane storage unit, a fourth control valve, and a compressed nitrogen storage unit. The fifth pipeline, after installing the second foam flow meter and a second foam pressure gauge, is connected to the foam generator.

[0014] As a further option, the proportioning mixer is a venturi proportioning mixer with a replaceable orifice plate.

[0015] The features and beneficial effects of this utility model are as follows:

[0016] (1) This utility model can effectively test the fire extinguishing performance of heptafluoropropane foam and determine the fire extinguishing parameters by cooperating with the sealing ring fire test mechanism, the cooling water supply mechanism and the foam mixture supply mechanism. It effectively avoids the problem that the existing parameters have a large safety factor, resulting in a high economic cost of the fire extinguishing system. At the same time, it has a great promoting effect on improving the safety level of the tank area.

[0017] (2) This utility model fully considers the current application status of internal floating roof tanks and the flow characteristics of foam, protection distance and economic efficiency of the test. It sets key dimensions such as the distance between the side wall and the internal floating roof, the distance between the side wall and the foam weir plate, and the height of the foam weir plate, which can truly reflect the actual situation of the sealing ring fire and make the test parameters more reliable. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the fire extinguishing parameter testing device for the heptafluoropropane foam fire extinguishing system described in this embodiment of the present invention;

[0020] Figure 2 for Figure 1 Enlarged view of the central X-section;

[0021] Figure 3 for Figure 1 A schematic diagram of the view from direction A in the diagram;

[0022] Figure 4 for Figure 1 A schematic diagram of the view from direction B in the diagram;

[0023] Figure 5 for Figure 1 A schematic diagram of the sectional view from direction 1-1;

[0024] Figure 6 This is a schematic diagram of the cooling water supply mechanism described in an embodiment of the present utility model;

[0025] Figure 7 This is a schematic diagram of the foam mixture supply mechanism described in an embodiment of the present invention.

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Sealed ring fire test model; 11-Weir plate; 12-Inner floating roof; 13-Side plate; 14-Bottom plate; 15-Side wall; 16-Baffle; 2-Cooling water supply mechanism; 21-Water storage unit; 22-Water pump; 23-No. 1 water supply pressure gauge; 24-Water supply check valve; 25-Flow meter; 26-No. 1 water supply control valve; 27-No. 2 water supply control valve; 28-No. 2 water supply pressure gauge; 29-No. 3 water supply control valve; 210-No. 4 water supply control valve; 3-Mixed liquid supply mechanism; 31-Foam mixed liquid storage unit; 32-Fire pump; 33-No. 1 foam pressure gauge; 34 - Foam check valve; 35- Foam flow meter No. 1; 36- Proportional mixer; 37- Foam pressure gauge No. 2; 38- Compressed nitrogen storage unit; 39- Foam flow meter No. 2; 310- Control valve No. 1; 311- Control valve No. 2; 312- Control valve No. 3; 313- Heptafluoropropane storage unit; 314- Control valve No. 4; 315- Control valve No. 5; 316- Control valve No. 6; 4- Cooling water pipe; 5- Water curtain nozzle; 6- Heptafluoropropane foam generator; 7- Pipe support; 8- Heptafluoropropane foam mixture pipe; 9- Cooling water pipe riser; 10- Flammable liquid. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below, along with embodiments of this utility model, but this does not limit the scope of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0031] A fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system, applicable to, but not limited to, storage tanks employing single-panel or double-panel internal floating roofs made of steel, such as... Figures 1 to 7 As shown, including

[0032] Fire test model 1 with sealing ring is used to hold flammable liquids and simulate a fire scene.

[0033] Cooling water supply mechanism 2 is used to provide cooling water to the sealing ring fire test model 1 through water curtain nozzle 5 to cool the side wall and side plate;

[0034] The mixing liquid supply mechanism 3 is used to provide heptafluoropropane foam to the sealed ring fire test model 1 for fire extinguishing via the foam generator 6.

[0035] The sealing ring fire test model 1 includes a body, which is a rectangular shell with an open top. An inner floating roof 12 is installed at the bottom of the body. The inner floating roof 12 is an inverted U-shaped channel structure and is welded to the bottom plate. A weir plate 11 is fixedly installed on one side of the inner floating roof 12, forming a long sidewall of the body. The sum of the height of the weir plate 11 and the height of the inner floating roof is equal to the height of the sidewall. A baffle 16 is fixedly installed on the other long sidewall of the body. A heptafluoropropane foam generator 6 is installed on the outside of the baffle 16. The heptafluoropropane foam generator 6 is connected to a mixing liquid supply mechanism 3 through a foam mixing liquid pipe 8. The mixing liquid supply mechanism 3 is used to supply heptafluoropropane foam mixing liquid to the heptafluoropropane foam generator 6. The body is used to hold flammable liquid 10, and the flammable liquid 10 is located in the area between the inner floating roof 12 and the sidewall.

[0036] In some embodiments, flammable liquid 10 refers to low-boiling-point flammable liquid, which is a flammable liquid with a boiling point below 45°C or with a molar percentage of C5 and below components of not less than 30%, such as propylene oxide, n-pentane, light naphtha, and tartar oil.

[0037] In some embodiments, the flammable liquid 10 may also be other flammable liquids besides low-boiling-point flammable liquids, such as propionaldehyde, methyl tert-butyl ether, gasoline, etc.

[0038] In some embodiments, a cooling water pipe 4 is installed on the outside of the main body via a pipe support 7. A plurality of water curtain nozzles 5 are evenly distributed on the cooling water pipe 4. The cooling water pipe 4 is connected to the cooling water supply mechanism 2 for supplying cooling water to the water curtain nozzles 5. The cooling water pipe 4 is connected to the cooling water supply mechanism 2 via a cooling water pipe riser 9.

[0039] In some embodiments, the cooling water pipe and the outer wall of the main body are provided with a gap of 0.2-0.5m, preferably 0.35m.

[0040] In some embodiments, the flow coefficient of the water curtain nozzle 5 is 5-20, and the water curtain angle is 90°-150°, preferably 120°. The design of the cooling water pipe 4 and the water curtain nozzle 5 can ensure uniform distribution of cooling water and effectively simulate the side wall cooling system in actual engineering.

[0041] In some embodiments, the body of the sealing ring fire test model 1 is made of carbon steel plate with a thickness of not less than 5mm, and all pipes are made of galvanized steel pipe.

[0042] In some embodiments, the weir plate 11 is a foam weir plate, and the baffle 16 is a foam baffle.

[0043] In some embodiments, the main body is formed by an integral base plate 14, two side walls 15, and two side plates 13. The side walls 15 are 15m long and 0.9m high. The length of the side walls 15 is slightly greater than the maximum protection distance requirement for a single side of a foam generator, and the height meets the foam stacking height requirement. These dimensions satisfy engineering requirements while saving on experimental materials. The base plate 14 is 15m long and 0.6m wide, with the same length as the side walls. The width of the base plate meets the distance requirement between the foam weir plate 11 and the side walls. Two side plates 13 are located on both sides of the model, each 0.6m long and 0.9m high. These side plates are used to limit the foam flow distance within the generator's protection range. The inner floating roof 12 is welded from three steel plates, which are welded together with the base plate 14 to form a U-shaped channel. The inner floating roof is 15m long and 0.9m wide. The inner floating roof is 3m high and 0.3m wide, with a distance of 0.3m between the inner floating roof and the side wall. This is used to simulate the sealing gap between the floating roof and the side wall, and all values ​​meet the engineering design requirements. The foam weir plate 11 is welded to the top of one side wall of the inner floating roof. It is 0.6m high and 15m long. The sum of the height of the weir plate 11 and the height of the inner floating roof is equal to the height of the side wall. This value takes into account both the engineering design requirements and the requirements for foam accumulation during the test. The foam baffle 16 is welded to the top of the side wall at the end of the model. The foam baffle is 1m wide and 0.6m high. The foam generator 6 is installed at the top center of the foam baffle 16. This arrangement is conducive to foam release, which can simulate the situation of foam flowing down the side wall and prevent foam loss.

[0044] In some embodiments, the cooling water supply mechanism 2 includes a water storage unit 21, a water pump 22, a first water supply pressure gauge 23, a water supply check valve 24, a flow meter 25, a first water supply control valve 26, a second water supply control valve 27, and a second water supply pressure gauge 28. The water storage unit 21 is connected to the second water supply control valve 27 via a first water supply pipeline and a second water supply pipeline. The first water supply pipeline is installed sequentially from the water storage unit 21 with a third water supply control valve 29, a water pump 22, a first water supply pressure gauge 23, a water supply check valve 24, and a fourth water supply control valve 210. The second water supply pipeline is a return pipeline with the first water supply control valve 26 installed. The water in the second pipeline flows to the water storage unit 21. Its main function is to control the amount of water supplied by the cooling water supply mechanism 2 to the sealing ring fire test model 1 by adjusting the return flow of the pipeline. The No. 2 water supply control valve 27 is installed on the third water supply pipeline. A flow meter and a No. 2 water supply pressure gauge 28 are also installed on the third water supply pipeline, and the third water supply pipeline is connected to the cooling water pipeline.

[0045] The working principle of cooling water supply mechanism 2 is as follows:

[0046] The main workflow includes the commissioning process of the cooling water supply mechanism 2 and the fire extinguishing test process. The commissioning process of the cooling water supply mechanism 2 mainly involves adjusting the relevant valves of the cooling water supply mechanism 2 to fix the flow rate of the cooling water in the cooling water supply mechanism 2 to the test set value, so that the flow rate of the cooling water supply mechanism 2 can reach the test set value as soon as possible during the fire extinguishing test.

[0047] Cooling water supply mechanism 2 commissioning procedure: Before commissioning, ensure that all valves of cooling water supply mechanism 2 are closed. During commissioning, first open the No. 3 water supply control valve 29 and the No. 4 water supply control valve 210 of the water storage unit 21, and then start the water pump 22. After the water pump 22 starts, adjust the opening of the No. 1 water supply control valve 26 and the No. 2 water supply control valve 27 so that the pointer of the flow meter 25 indicates the test set flow rate. After adjustment, record the values ​​of the No. 1 water supply pressure gauge 23 and the No. 2 water supply pressure gauge 28. Then turn off the water pump 22 to stop the water pump from working, close the No. 4 water supply control valve 210, keep the opening of the No. 2 water supply control valve 27 and the No. 1 water supply control valve 26 unchanged, and keep the No. 3 water supply control valve 29 in the open state, and wait for the fire extinguishing test.

[0048] Fire extinguishing test procedure: After the test begins, start the water pump 22 first, then open the fourth control valve 210, and the cooling water supply mechanism 2 can supply cooling water to the sealed ring fire extinguishing model at the test set flow rate.

[0049] The No. 1 water supply control valve 26 has two functions. First, it tests whether the water pump 22 can work normally. During the test, the No. 2 water supply control valve 27 is kept closed, the No. 3 water supply control valve 29 is opened, the water pump 22 is started, and then the No. 1 water supply control valve 26 is slowly opened. If the water pump 22 is running normally, the water will flow back to the water storage unit 21 through the No. 1 water supply control valve 26. Second, it assists in regulating the system flow. During system operation, the No. 1 water supply control valve 26 mainly acts as a diversion valve. Part of the water supplied by the water pump 22 flows into the sealed ring fire test model 1 through the No. 2 water supply control valve 27, and part flows back to the water storage unit 21 through the No. 1 water supply control valve 26. The two work together to make it relatively easy to control the system flow to the test set value.

[0050] In some embodiments, the water storage unit 21 is used to store cooling water and may be made of materials such as carbon steel or high-density polyethylene, with a volume of not less than 3m³. 3 Water pump 22 is a centrifugal pump with a head of not less than 1.0 MPa and a flow rate of not less than 140 L / min. The cooling water supply flow rate can be adjusted through water supply control valve 26 (number one) and water supply control valve 27 (number two). Water supply check valve 24 is a swing check valve. Water supply pressure gauges 23 (number one) and 28 (number two) are both Bourdon tube pressure gauges with a range of 0-1.6 MPa. Flow meter 25 can be an electromagnetic flow meter, turbine flow meter, etc., with a measurement range of 1-18 m³ / min. 3 / h. During the fire test, the fire water is pressurized by the water pump 22 and delivered to the water curtain nozzle 5, and then sprayed onto the surface of the main body. The cooling water supply flow rate can be changed by adjusting the No. 1 water supply control valve 26 and the No. 2 water supply control valve 27.

[0051] In some embodiments, the mixture supply mechanism 3 includes a foam mixture storage unit 31, a fire pump 32, a first foam pressure gauge 33, a foam check valve 34, a first foam flow meter 35, a proportioning mixer 36, a second foam pressure gauge 37, a compressed nitrogen storage unit 38, a second foam flow meter 39, a first control valve 310, a second control valve 311, a third control valve 312, a heptafluoropropane storage unit 313, and a fourth control valve 314. The foam mixture storage unit 31 is connected to a first pipeline. The second pipeline connects to control valve 311. On the first pipeline, from the foam mixture storage unit 31, control valve 315, fire pump 32, foam pressure gauge 33, foam check valve 34, and control valve 316 are installed sequentially. Control valve 312 is installed on the second pipeline. The second pipeline is a return pipeline, and the mixture within it flows to the foam mixture storage unit 31. Its main function is to control the amount of mixture supplied by the mixture supply mechanism 3 to the sealing ring fire test model 1 by adjusting the return flow rate of the pipeline. Control valve 311 and foam flow meter 35 are both installed on the third pipeline. The third, fourth, and fifth pipelines are all connected to the proportioner 36. On the fourth pipeline, from the proportioner 36, control valve 310, heptafluoropropane storage unit 313, control valve 314, and compressed nitrogen storage unit 38 are installed sequentially. Foam flow meter 39 and foam pressure gauge 37 are installed on the fifth pipeline, which then connects to the foam mixture pipeline 8.

[0052] The working principle of the liquid supply mechanism 3 is as follows: The main working process includes the commissioning process of the liquid supply mechanism 3 and the fire extinguishing test process. The commissioning process of the liquid supply mechanism 3 mainly involves adjusting the relevant valves of the liquid supply mechanism 3 to fix the flow rate of the liquid supply mechanism 3 to the test set value, so that the flow rate of the liquid supply mechanism 3 can reach the test set value as soon as possible during the fire extinguishing test.

[0053] System commissioning procedure: Before commissioning, ensure all valves of the mixed liquid supply mechanism 3 are closed. During commissioning, first open control valve 5 (315), control valve 6 (316), and control valve 4 (314), then start the fire pump 32. After the fire pump starts, adjust the opening of control valve 2 (311) and control valve 312 to make the flow rate of the foam mixture reach the test set value. Determine the flow rate of the foam mixture by observing the foam flow meter 35 (1). Adjust the opening of control valve 310 (1) to allow the heptafluoropropylene... When the flow rate of the heptafluoropropane foam mixture reaches the test set value, the flow rate of the heptafluoropropane foam mixture is determined by observing the No. 2 foam flow meter 39. When the flow rate of the mixture supply mechanism 3 reaches the test set value, the values ​​of each flow meter and pressure gauge are recorded. The fire pump 32 is shut down to stop working, the No. 6 control valve 316 is closed, the opening of the No. 1 control valve 310, the No. 2 control valve 311, and the No. 3 control valve 312 remains unchanged, and the No. 5 control valve 315 and the No. 4 control valve 314 remain open, waiting for the fire extinguishing test.

[0054] Fire extinguishing test procedure: During the fire extinguishing test, first turn on the fire pump 32, and then open the control valve 316 to ensure that the flow rate is the test set value.

[0055] Control valve 312 has the same function as water supply control valve 26.

[0056] Foam mixture storage unit 31 is used to store foam mixture, with a volume of not less than 3m³. 3 The test can use 3% or 6% foam concentrate (e.g., 3% aqueous film-forming foam concentrate, 6% fluoroprotein foam concentrate, etc.), directly using the foam mixture, eliminating the need for a foam proportioning device and reducing test costs. The fire pump 32 is a centrifugal pump with a rated head of not less than 1.2 MPa and a rated flow rate of not less than 200 L / min. The compressed nitrogen storage unit 38 has a filling pressure of not less than 10 MPa and a volume of not less than 200 L, and the heptafluoropropane storage unit 313 has a filling pressure of not less than 1.2 MPa and a volume of not less than 120 L.

[0057] Foam check valve 34 is a swing check valve. Foam pressure gauge 33 (No. 1) and foam pressure gauge 37 (No. 2) are both Bourdon tube gauges; the range of foam pressure gauge 33 is 0-2.5 MPa, and the range of foam pressure gauge 37 is 0-2.0 MPa. Foam flow meters 35 (No. 1) and 39 (No. 2) can be electromagnetic flow meters, turbine flow meters, etc., with a measurement range of 1-16 m³ / h. 3 / h. Control valves 311 and 312 are both shut-off valves, control valve 310 is a needle valve, and control valve 314 is a ball valve. The flow rate of the foam mixture can be adjusted through control valves 311 and 312, and the flow rate of heptafluoropropane can be adjusted through control valve 310.

[0058] During the fire extinguishing test, the foam mixture is pressurized by the fire pump 32 and enters the proportioner 36 from the foam mixture storage unit 31. Compressed nitrogen enters the heptafluoropropane storage unit 313 from the compressed nitrogen storage unit 38, driving the heptafluoropropane liquid into the proportioner 36. After the two are mixed, a heptafluoropropane foam mixture is formed, which is then transported to the foam generator 6 through a pipeline. After the foam generator 6 generates foam, it flows into the fire area along the side wall of the main body to extinguish the fire.

[0059] Since this scheme is mainly used for testing fire extinguishing parameters and requires some adjustments, all control valves in the cooling water supply mechanism 2 and the mixed liquid supply mechanism 3 are common mechanical valves that require manual operation. The water pump and fire pump are common centrifugal pumps, controlled by switches for start and stop. Pressure gauges and flow meters are any common instruments that can perform this function. During testing, the flow rate needs to be adjusted at any time based on real-time observation of the entire test status. The proportioning mixer is a Venturi proportioning mixer that can perform this function, and its orifice plate is replaceable, allowing the mixing ratio to be adjusted by changing the orifice plate diameter.

[0060] The working principle of a fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system is as follows:

[0061] Combustible liquid was added to the body of the sealed-ring fire test model 1, and ignited using an external ignition device. Then, the cooling water supply mechanism 2 was activated, and pre-ignition was allowed for 1 minute. Afterward, the mixture supply mechanism 3 was activated to begin extinguishing the fire. During the test, the flow rate of the heptafluoropropane foam mixture and the extinguishing time were recorded. The supply intensity was obtained by dividing the flow rate of the heptafluoropropane foam mixture by the protected area, where the protected area was the length multiplied by the width of the test model. The supply intensity of the heptafluoropropane foam mixture could be changed by adjusting the relevant control valves. Repeated tests could be conducted to test the extinguishing effect under different supply intensities. All test parameters were compiled into a booklet for future reference.

[0062] This application uses a fire test model of the sealed ring to simulate a fire in an internal floating roof tank to test the fire extinguishing parameters. This not only reflects the actual situation of a fire in the sealed ring and effectively tests the fire extinguishing performance of heptafluoropropane foam and determines the fire extinguishing parameters, but also reduces the test cost.

[0063] It should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for testing extinguishing parameters of a heptafluoropropane foam fire extinguishing system, characterized in that: The system includes a cooling water supply mechanism for providing cooling water to the sealing ring fire test model, a mixture supply mechanism for providing foam mixture to the sealing ring fire test model, and the sealing ring fire test model. The sealing ring fire test model includes a body, an inner floating roof installed at the bottom of the body, the inner floating roof being an inverted U-shaped channel structure welded to the bottom plate, a weir plate fixedly installed above one side of the inner floating roof to form a long side wall of the body, a baffle installed above the other long side wall of the body, the body being used to hold flammable liquid, and the flammable liquid being located in the area between the inner floating roof and the side wall.

2. The fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system according to claim 1, characterized in that: A heptafluoropropane foam generator is installed on the outside of the baffle. The heptafluoropropane foam generator pipeline is connected to the mixed liquid supply mechanism. A cooling water pipeline is installed on the outside of the main body. Several water curtain nozzles are evenly distributed on the cooling water pipeline. The cooling water pipeline and the cooling water supply mechanism are connected.

3. The fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system according to claim 2, characterized in that: The cooling water pipes and the outer wall of the main body are spaced apart, with a spacing of 0.2-0.5m.

4. The fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system according to claim 2, characterized in that: The flow coefficient of the water curtain nozzle is 5-20, and the water curtain angle is 90°-150°.

5. The fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system according to claim 2, characterized in that: The internal floating roof is an inverted U-shaped channel structure, and the distance between the internal floating roof and the side wall is 0.2-0.4m.

6. The fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system according to claim 2, characterized in that: The heptafluoropropane foam generator is installed at the top center of the foam baffle.

7. The fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system according to claim 1, characterized in that: The sum of the height of the weir plate and the height of the inner floating roof is equal to the height of the sidewall.

8. The fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system according to claim 1, characterized in that: The cooling water supply mechanism includes a water storage unit and a second water supply control valve. The water storage unit is connected to the second water supply control valve through the first water supply pipeline and the second water supply pipeline. The third water supply control valve, the water pump, the first water supply pressure gauge, the water supply check valve, and the fourth water supply control valve are installed sequentially from the water storage unit on the first water supply pipeline. The first water supply control valve is installed on the second water supply pipeline. The second water supply control valve is installed on the third water supply pipeline. The flow meter and the second water supply pressure gauge are installed on the third water supply pipeline and then connected to the cooling water pipeline.

9. The fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system according to claim 1, characterized in that: The mixed liquid supply mechanism includes a mixed liquid storage unit and a second control valve. The mixed liquid storage unit is connected to the second control valve via a first pipeline and a second pipeline. The first pipeline, from the mixed liquid storage unit, sequentially installs a fifth control valve, a fire pump, a first foam pressure gauge, a foam check valve, and a sixth control valve. The second pipeline installs a third control valve. The second control valve and a first foam flow meter are both installed on the third pipeline. The third, fourth, and fifth pipelines are all connected to a proportioning mixer. The fourth pipeline, from the proportioning mixer, sequentially installs a first control valve, a heptafluoropropane storage unit, a fourth control valve, and a compressed nitrogen storage unit. The fifth pipeline, after installing the second foam flow meter and a second foam pressure gauge, is connected to the heptafluoropropane foam generator.

10. The fire extinguishing parameter testing device for a heptafluoropropane foam fire extinguishing system according to claim 1, characterized in that: The proportioning mixer is a Venturi proportioning mixer and the orifice plate is replaceable.

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