Electrified fire extinguishing medium for oil-filled equipment in a substation

Abstract

The application discloses a substation oil-filled equipment live extinguishing medium, and the mass concentration ratio of raw materials of the extinguishing medium is as follows: 5-35% of ethylene glycol, 5-20% of non-ionic foaming emulsifier, 3-8% of ethylene glycol butyl ether, 2-5% of non-ionic film-forming spreading agent, 0.2-0.6% of xanthan gum, 0.15-0.5% of non-ionic organic corrosion inhibitor and 0.5-1.5% of metal chelating agent, and the rest is deionized water with conductivity lower than 10 mu s / cm. The product formula uses non-ionic raw materials, and after being mixed with water in a proportion, the conductivity is lower than 200 mu s / cm. The conductivity of the extinguishing agent is prevented from being improved under long-term storage by adding a corrosion inhibitor / chelating agent compound, and the extinguishing agent can be used in combination with a water quality monitoring and processing device to realize spraying and extinguishing for live equipment within the effective period of the extinguishing agent. The extinguishing medium uses a new type of fluorosilicon / fluoroether structure film-forming agent, which can be naturally degraded in the environment on the basis of ensuring hydrophobicity, oleophobicity, film forming and spreading. Meanwhile, by adding a new type of high-efficiency cooling and emulsifying aid, the ability of the product to quickly extinguish and prevent re-ignition is ensured.

Description

Technical Field

[0001] This invention belongs to the field of fire extinguishing agent technology, specifically relating to a live fire extinguishing medium for oil-filled equipment in substations. Background Technology

[0002] Substations, as a crucial part of the power grid, play a vital role in power transfer and distribution. Oil-immersed transformers, as the core equipment of substations, are filled with high-temperature insulating oil. In the event of an accident or fire, they can cause serious damage to surrounding equipment, buildings, and personnel, resulting in power outages and significant economic losses. To ensure the safe operation of substations, large transformers are often equipped with foam spray fire suppression systems.

[0003] Under prolonged automatic operation, existing fixed fire suppression systems in substations pose a risk of accidental spraying due to human error or system malfunction, potentially causing transformer short circuits and equipment damage. Secondly, when fires occur in transformers and other electrical equipment during operation, the usual method is to extinguish the fire after a power outage. However, according to power company safety operating procedures, power outages are lengthy, delaying optimal fire suppression opportunities. Furthermore, line outages can cause widespread power outages, negatively impacting social production and daily life. Therefore, there is an urgent need to research key technologies for live-line fire suppression systems in substations, ensuring that the activation of the fire suppression system does not cause transformer short circuits or tripping in the event of system malfunctions or fires, thus guaranteeing the safe operation of the substation.

[0004] GB50219 "Technical Specification for Water Spray Fire Extinguishing Systems" and GB50898-2013 "Technical Specification for Fine Water Mist Fire Extinguishing Systems" stipulate that water spray / fine water mist fire extinguishing systems can be used to extinguish electrical fires. However, for foam spray systems, because the extinguishing medium contains a large amount of ionic raw materials, the conductivity of the foam solution is much higher than that of water. Furthermore, under long-term storage conditions, corrosion and degradation further increase the conductivity of the foam solution, significantly reducing the system's electrical insulation. If the system malfunctions or engages in extinguishing a fire while energized, it will inevitably cause a transformer short-circuit trip, resulting in a serious power operation accident. Therefore, there is an urgent need to develop foam extinguishing agents with strong insulation properties and high extinguishing efficiency to ensure that the foam solution meets the requirements for extinguishing fires while energized within the product's shelf life.

[0005] Prior art document 1 (CN108837362B) discloses a water-based fire extinguishing agent suitable for transformer oil fires. Its raw materials include: fluorocarbon surfactants, surfactant betaine, corrosion inhibitors, and antifreeze; the remainder is water. This water-based fire extinguishing agent isolates transformer oil droplets, rapidly stopping combustion, preventing reignition, and mitigating or reducing equipment corrosion. However, a drawback of prior art document 1 is that it uses betaine-based surfactants as the main raw material, which greatly increases conductivity. After mixing with water in a certain proportion, the conductivity can reach several times or even tens of times that of water. If misoperated or if the fire is extinguished while energized, it can cause the transformer to trip, leading to a power grid operation accident. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a live-line fire extinguishing medium for oil-filled equipment in substations, which enables live-line spraying without flashover of transformers, significantly improving the product's environmental friendliness and fire extinguishing effectiveness, and allowing for long-term use.

[0007] The present invention adopts the following technical solution.

[0008] The first aspect of the present invention provides an energized fire extinguishing medium for oil-filled equipment in substations, which is prepared from the following components by weight percentage:

[0009] Ethylene glycol 5%–35%, nonionic foaming emulsifier 5%–20%, ethylene glycol butyl ether 3%–8%, nonionic cooling agent 3%–8%, nonionic film-forming spreader 2%–5%, xanthan gum 0.2%–0.6%, metal chelating agent 0.5%–1.5%, preservative 0.2%–1.0%, organic corrosion inhibitor 0.15%–0.5%, with the balance being deionized water with a conductivity of less than 10 μS / cm.

[0010] Preferably, the nonionic foaming emulsifier is an alkyl glycoside APG0810 or a fatty tertiary amine dipolyoxyethylene ether, wherein the fatty tertiary amine dipolyoxyethylene ether has the structural formula RN[(CH2CH2O)]. n H]2, where R is a C12-C18 alkyl straight chain and n is 2-4.

[0011] Preferably, the nonionic cooling agent is benzophenone-2-hydroxy-4-methoxy-5-sulfonic acid.

[0012] Preferably, the nonionic film-forming spreading agent is a fluorocarbon surfactant. 1754. At least one of the following: perfluoropolyether amine oxide surfactant and dual-terminated fluorosilicone surfactant, wherein the dual-terminated fluorosilicone surfactant has the following structure:

[0013] HO-[CH2CH2O] m-(CH2)3-[Si(CH3)2O]2-[Si(CH3)(CH2CH2CF3)O] n -[Si(CH3)2O]2-(CH2)3-[OCH2CH2] m -OH.

[0014] Preferably, the nonionic corrosion inhibitor is a nitrogen-containing heterocyclic compound, at least one of benzotriazole, methylbenzotriazole, uracil, and polyvinylpyrrolidone.

[0015] Preferably, the metal chelating agent is at least one of sorbitol, lactitol, and xylitol.

[0016] Preferably, the preservative is 1,2-phenylpropiothiazolin-3-one.

[0017] Preferably, the sum of the weight percentages of the components of the extinguishing agent is 100%, and the extinguishing medium is mixed with water at a volume ratio of 3:97 for extinguishing fires on energized large oil-filled equipment in substations.

[0018] A second aspect of the present invention provides a device for extinguishing fires with an energized medium in an oil-filled substation, comprising:

[0019] The water quality monitoring and treatment device consists of a water quality analysis module and a purification module. The testing module includes an inlet and outlet device and an online conductivity meter, which is used to sample and test the conductivity of the water in the fire water tank. The purification module includes a power module, a relay and an industrial pure water equipment, which is used to start the industrial pure water equipment and continuously purify foreign matter and ions in the water tank.

[0020] Preferably, when the conductivity meter in the test module tests the water conductivity in the water tank to be higher than 150 μs / cm, it outputs an upper limit alarm message and triggers a relay to start the purification module. When the water conductivity in the water tank is lower than 120 μs / cm, it outputs a lower limit alarm message and triggers a relay to stop the water purification module.

[0021] The beneficial effects of this invention are that, compared with the prior art,

[0022] 1. The extinguishing medium for the substation oil-filled equipment of the present invention is composed entirely of non-ionic raw materials, and its conductivity can be reduced to below 200μs / cm. Verified by power frequency voltage test, the extinguishing medium can achieve live spraying of the transformer without flashover.

[0023] 2. The energized fire extinguishing medium of the substation oil-filled equipment of the present invention uses a new type of fluorosilicone and polyether film-forming and spreading agent, and adds new fire extinguishing and cooling agents, emulsifying and encapsulating agents and other new functional additives, which can significantly improve the environmental protection and fire extinguishing effectiveness of the product and meet the highest fire extinguishing level IA requirements of GB15308 "Foam Fire Extinguishing Agents".

[0024] 3. By adding functional additives such as corrosion inhibitors and chelating agents to the fire extinguishing medium and using it in conjunction with a water quality monitoring and treatment device, this invention can ensure that the system has the ability to spray electricity during long-term use. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a live fire suppression system;

[0026] In the diagram: 1. Sample pump; 2. Detection chamber; 3. Online conductivity analyzer; 4. Immersion conductivity sensor and accessories; 5. Relay; 6. Industrial pure water equipment; 7. Integrated housing of water quality monitoring and treatment device; 8. Water storage tank; 9. Water pump; 10. Foam box; 11. Foam pump; 12. Proportional mixing device; 13. System piping nozzles. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, the appendices in the embodiments of the present invention will be described below. Figure 1 The technical solutions of the present invention will be clearly and completely described herein. The embodiments described in this application are merely some embodiments of the present invention, and not all embodiments. Based on the spirit of the present invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of the present invention.

[0028] Example 1:

[0029] A fire extinguishing medium for energized substation oil-filled equipment comprises the following components (by weight percentage): ethylene glycol 5%, alkyl glycoside APG081 5%, octadecyl tertiary amine dipolyoxyethylene ether (n=4) 3%, ethylene glycol butyl ether 3%, and benzophenone 2-hydroxy-4-methoxy-5-sulfonic acid 3%. The fire extinguishing agent consists of 17541.5% double-terminated fluorosilicone surfactant, 0.5% xanthan gum, 0.6% sorbitol, 0.2% lactitol, 0.3% 1,2-phenylpropiothiazolin-3-one, 0.2%–1.0% benzotriazole, 0.1% methylbenzotriazole, and 0.05% deionized water with a conductivity of less than 10 μS / cm. The sum of the weight percentages of all components is 100%.

[0030] The product preparation process is as follows: Add deionized water, ethylene glycol, and ethylene glycol butyl ether to a reaction vessel according to the above formula. Add xanthan gum while stirring at 1000 r / min and stir for 1 hour. Add all remaining raw materials, adjust the stirring speed to 500 r / min, and stir for 0.5 hours to ensure uniform dispersion. After standing, the product is obtained. Mix with water at a volume ratio of 3:97 to perform live fire extinguishing of large oil-filled equipment in substations.

[0031] Example 2:

[0032] A fire extinguishing medium for energized substation oil-filled equipment comprises the following components (by weight percentage): ethylene glycol 35%, alkyl glycoside APG0810 15%, hexadecyl tertiary amine dipolyoxyethylene ether (n=2) 5%, ethylene glycol butyl ether 8%, and benzophenone 2-hydroxy-4-methoxy-5-sulfonic acid 8%. The fire extinguishing agent consists of 17544% perfluoropolyether amine oxide, 1% xanthan gum, 0.2% xylitol, 1.5% 2-phenylpropylisothiazolin-3-one, 0.0% uracil, and 0.2% polyvinylpyrrolidone; the balance is deionized water with a conductivity of less than 10 μs / cm. The sum of the weight percentages of all components is 100%. When mixed with water at a volume ratio of 3:97, it can be used for extinguishing fires involving large oil-filled equipment in substations.

[0033] Example 3:

[0034] A fire extinguishing medium for energized substation oil-filled equipment comprises the following components (by weight percentage): ethylene glycol 10%, alkyl glycoside APG081 0.8%, hexadecyl tertiary amine dipolyoxyethylene ether (n=4) 3%, ethylene glycol butyl ether 4%, and benzophenone 2-hydroxy-4-methoxy-5-sulfonic acid 5%. The fire extinguishing agent consists of 17542% perfluoropolyether amine oxide, 1% double-terminated fluorosilicone surfactant, 0.5% xanthan gum, 0.3% sorbitol, 0.8% 1,2-phenylpropiothiazolin-3-one, and 0.3% polyvinylpyrrolidone; the balance is deionized water with a conductivity of less than 10 μS / cm. The sum of the weight percentages of all components is 100%. When mixed with water at a volume ratio of 3:97, it can be used for extinguishing fires involving energized oil-filled equipment in substations.

[0035] Comparative example: Taking a commercially available Class IA 3% aqueous film-forming foam fire extinguishing agent as an example (by weight): ethylene glycol 10%, alkyl glycoside 2%, alkylamidopropyl betaine 15%. 11571.5% 1440 1.5%, xanthan gum 0.3%, sodium benzoate 0.5%.

[0036] Application Example 1: Referring to the power frequency withstand voltage test, the extinguishing medium and water were prepared at a volume ratio of 3:97. A fine water mist nozzle (XSW-T1.2 / 10) was used to spray the casing. The working pressure was above 10 MPa, and the vertical height between the water mist nozzle and the insulating casing was between 3.0 and 5.0 m. The surface contamination of the casing should meet the upper limit standard of Class D (salt density 0.25 mg / cm³). 2 Ash density 1.0 mg / cm³ 2 The bushing withstand voltage at 252kV / 1mn did not flashover. The results show that in Examples 1, 2, and 3, no bushing flashover to ground occurred after being mixed with water and sprayed as a fine water mist.

[0037] Application Example 2: Referring to the GB15308-2006 standard "Foam Extinguishing Agents", tests were conducted on foaming ratio, 25% liquid release time, strong release extinguishing performance, and 25% burning resistance time. The foaming ratio should be ≥6 times, the liquid release time ≥2.5 min, the extinguishing time ≤3 min, and the burning resistance ≥10 min. The results are shown in the table below.

[0038] Example 1 Example 2 Example 3 Comparative Example Foaming ratio 6.1 times 7.8 times 7.2 times 7.2 times 25% precipitation time 3.5min 2.8min 3.2min 3.0min Strong fire extinguishing performance 2.0min 1.7min 1.8min 2.5min 25% fire resistance time 12.5min 15.8min 13.2min 10.3min

[0039] Application Example 3: Referring to the conductivity test method, the conductivity of the extinguishing medium mixture is ≤200μs / cm. The results are shown in the table below.

[0040] Example 1 Example 2 Example 3 Comparative Example Concentrate conductivity 1760μs / cm 2400μs / cm 1995μs / cm 10510μs / cm Diluent conductivity 165μs / cm 193μs / cm 172μs / cm 615μs / cm

[0041] The above embodiments demonstrate that the beneficial effects of the present invention are that, compared with the prior art,

[0042] 1. The extinguishing medium for the substation oil-filled equipment of the present invention is composed entirely of non-ionic raw materials, and its conductivity can be reduced to below 200μs / cm. Verified by power frequency voltage test, the extinguishing medium can achieve live spraying of the transformer without flashover.

[0043] 2. The energized fire extinguishing medium of the substation oil-filled equipment of the present invention uses a new type of fluorosilicone and polyether film-forming and spreading agent, and adds new fire extinguishing and cooling agents, emulsifying and encapsulating agents and other new functional additives, which can significantly improve the environmental protection and fire extinguishing effectiveness of the product and meet the highest fire extinguishing level IA requirements of GB15308 "Foam Fire Extinguishing Agents".

[0044] 3. By adding functional additives such as corrosion inhibitors and chelating agents to the fire extinguishing medium and using it in conjunction with a water quality monitoring and treatment device, this invention can ensure that the system has the ability to spray electricity during long-term use.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A live extinguishing medium for oil-filled equipment in a substation, characterized in that: The energized fire extinguishing medium for the oil-filled equipment in the substation is prepared from the following components by weight percentage: ethylene glycol 5%~35%, nonionic foaming emulsifier 5%~20%, ethylene glycol butyl ether 3%~8%, nonionic cooling agent 3%~8%, nonionic film-forming spreader 2%~5%, xanthan gum 0.2%~0.6%, metal chelating agent 0.5%~1.5%, preservative 0.2%~1.0%, organic corrosion inhibitor 0.15%~0.5%, and the balance is deionized water with a conductivity of less than 10 μs / cm; The nonionic cooling agent is benzophenone 2-hydroxy-4-methoxy-5-sulfonic acid; the nonionic corrosion inhibitor is a nitrogen-containing heterocyclic compound, at least one of benzotriazole, methylbenzotriazole, uracil, and polyvinylpyrrolidone; the metal chelating agent is at least one of sorbitol, lactitol, and xylitol. The extinguishing medium of the substation oil-filled equipment is composed entirely of non-ionic raw materials, and its conductivity can be reduced to below 200 μs / cm.

2. The energized fire extinguishing medium for oil-filled substation equipment according to claim 1, characterized in that: The nonionic foaming emulsifier is an alkyl glycoside APG0810 and a fatty tertiary amine dioxyethylene ether, the fatty tertiary amine dioxyethylene ether having the structural formula RN[(CH2CH2O)]. n H]2, where R is a C12~C18 alkyl straight chain and n is 2~4.

3. The energized fire extinguishing medium for oil-filled substation equipment according to claim 1, characterized in that: The nonionic film-forming spreader is at least one of the following: fluorocarbon surfactant Capstone® 1754, perfluoropolyether amine oxide surfactant, and dual-terminated fluorosilicone surfactant. The dual-terminated fluorosilicone surfactant has the following structure: HO-[CH2CH2O] m -(CH2)3-[Si(CH3)2O]2-[Si(CH3)(CH2CH2CF3)O] n -[Si(CH3)2O]2-(CH2)3-[OCH2CH2] m -OH。 4. The energized fire extinguishing medium for oil-filled substation equipment according to claim 1, characterized in that: The preservative is 1,2-phenylisothiazolin-3-one.

5. The energized fire extinguishing medium for oil-filled substation equipment according to claim 1, characterized in that: The sum of the weight percentages of the components of the extinguishing agent is 100%, and the extinguishing medium is mixed with water at a volume ratio of 3:97 for extinguishing fires on energized large oil-filled equipment in substations.

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