Composite additive and method for improving comprehensive performance of running phosphate fire-resistant oil

Abstract

The invention provides a composite additive and method for improving the comprehensive performance of phosphate fire-resistant oil for operation, and belongs to the technical field of phosphate fire-resistant oil. The composite additive is a mixture of 2, 6-butylated hydroxytoluene, benzofuranone compounds and silicone compounds, when the mixture is added into the running phosphate fire-resistant oil, the comprehensive performance of the phosphate fire-resistant oil in the running process can be improved, the stability of a phosphate fire-resistant oil product is enhanced, the speed of acid value increase and resistivity decrease is slowed down, the time of oil sludge appearing in the running phosphate fire-resistant oil is delayed, and the service life of the phosphate fire-resistant oil is prolonged. The stability and tendency of foam characteristics of the phosphate fire-resistant oil in operation are reduced, and abnormal shutdown accidents caused by faults of a servo regulating valve of a steam turbine are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of phosphate ester fire-resistant oil, and in particular to a composite additive and a method for improving the comprehensive performance of phosphate ester fire-resistant oil. Background Art

[0002] As an indispensable key component in the speed control system of modern steam turbines and gas turbines, phosphate ester fire-resistant oils provide a solid guarantee for efficient and safe operation with their excellent fireproof and lubricating properties. However, with the continuous operation of the equipment, phosphate ester fire-resistant oils have gradually exposed a series of problems, which seriously affect their performance and stability. Specifically, during the use of phosphate ester fire-resistant oils, phosphate ester fire-resistant oils are often faced with the challenges of increasing acid value and rapid decrease in resistivity. At the same time, the premature generation of sludge and excessive foam characteristics are also issues that cannot be ignored. These problems not only reduce the flexibility of the turbine parts and the response speed of the speed control system, but may also cause corrosion and jamming of the servo valve, and even cause abnormal shutdown of the unit in severe cases, posing a serious threat to the safe and stable operation of the power plant.

[0003] In order to improve the performance of phosphate ester fire-resistant oil in service, researchers have tried to add 2,6-di-tert-butyl-p-cresol to improve the acid value, resistivity and sludge precipitation stability of phosphate ester fire-resistant oil during use. After adding 2,6-di-tert-butyl-p-cresol to the running phosphate ester fire-resistant oil, it can indeed improve the stability of the running phosphate ester fire-resistant oil in the early stage, but it will cause the acid value to increase rapidly in the later stage of the deterioration of the running phosphate ester fire-resistant oil. Therefore, in view of the limitations of a single additive, exploring the combined use of multiple additives has become an important way to improve the performance of phosphate ester fire-resistant oil. Summary of the invention

[0004] In order to overcome the problems in the prior art, the present invention provides a composite additive and method for improving the comprehensive performance of running phosphate fire-resistant oil. The composite additive is a mixture of 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds. Adding the mixture to the running phosphate fire-resistant oil can improve its comprehensive performance during operation, enhance the stability of the phosphate fire-resistant oil product, slow down the rate of increase in acid value and decrease in resistivity, delay the time for sludge to appear in the running phosphate fire-resistant oil, reduce the stability and tendency of the foam characteristics of the running phosphate fire-resistant oil, and avoid the malfunction of the servo control valve of the turbine, which leads to the occurrence of abnormal shutdown accidents.

[0005] To achieve the above object, the present invention provides the following technical solution: a composite additive for improving the comprehensive performance of running phosphate fire-resistant oil, wherein the composite additive is a mixture of 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds.

[0006] Furthermore, by weight percentage, the amount of 2,6-di-tert-butyl-p-cresol added is 0.10% to 0.50% of the total oil in the phosphate ester fire-resistant oil system, the amount of benzofuranone compounds added is 0.0050% to 0.0200% of the total oil in the phosphate ester fire-resistant oil system, and the amount of silicone compounds added is 0.0010% to 0.0030% of the total oil in the phosphate ester fire-resistant oil system.

[0007] Furthermore, by weight percentage, the amount of 2,6-di-tert-butyl-p-cresol added is 0.30% of the total oil in the phosphate ester fire-resistant oil system, the amount of benzofuranone compounds added is 0.0100% of the total oil in the phosphate ester fire-resistant oil system, and the amount of silicone compounds added is 0.0020% of the total oil in the phosphate ester fire-resistant oil system.

[0008] Furthermore, 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds are mixed with a solvent to obtain a composite additive mother liquor. The composite additive mother liquor is added to the fuel tank of the phosphate ester fire-resistant fuel system and mixed with the running phosphate ester fire-resistant fuel to achieve the purpose of improving the comprehensive performance of the running phosphate ester fire-resistant fuel.

[0009] Furthermore, the 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds are mixed with a solvent at 60° C.±5° C. and stirred to obtain a composite additive mother solution.

[0010] Furthermore, the solvent is the phosphate ester fire-resistant oil running in the oil tank of the phosphate ester fire-resistant oil system.

[0011] The present invention also provides a method for improving the comprehensive performance of phosphate ester fire-resistant oil, the specific steps of which are as follows:

[0012] S1 obtains the total amount of phosphate ester fire-resistant oil running in the oil tank of the phosphate ester fire-resistant oil system, and calculates the amount of composite additive added according to the total amount of oil, wherein the composite additive includes 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds;

[0013] S2: adding calculated amounts of 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds into a solvent, and mixing them to obtain a composite additive mother solution;

[0014] S3 adds the composite additive mother liquid into the fuel tank of the phosphate ester fire-resistant fuel system, and the composite additive mother liquid is mixed with the running phosphate ester fire-resistant fuel to improve the comprehensive performance of the running phosphate ester fire-resistant fuel.

[0015] Furthermore, in S1, by weight percentage, the amount of 2,6-di-tert-butyl-p-cresol added is 0.10% to 0.50% of the total oil in the phosphate ester fire-resistant oil system, the amount of benzofuranone compounds added is 0.0050% to 0.0200% of the total oil in the phosphate ester fire-resistant oil system, and the amount of silicone compounds added is 0.0010% to 0.0030% of the total oil in the phosphate ester fire-resistant oil system.

[0016] Furthermore, in S2, the 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds are mixed with a solvent at 60°C±5°C and stirred to obtain a composite additive mother solution.

[0017] Furthermore, in S2, the solvent is the phosphate ester fire-resistant oil running in the oil tank of the phosphate ester fire-resistant oil system.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] The invention provides a composite additive for improving the comprehensive performance of running phosphate fire-resistant oil. The composite additive is specifically 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds. Since the oxidation of triaryl phosphate fire-resistant oil is mainly oxidation on aromatic ring substituents, the substituents on the aromatic rings generate free radicals under the catalysis of light or heat, and the free radicals react with oxygen to generate oxidation products such as aldehydes, ketones, acids, etc., thereby affecting the acid value, resistivity, sludge precipitation and other indicators of the oil product. After adding an antioxidant, the antioxidant can react with the free radicals and peroxides to form a stable compound, thereby consuming the free radicals generated in the oil and preventing the oxidation process of the oil molecules themselves. However, for running oil, poor antioxidant performance is caused. When the content of added 2,6-di-tert-butyl-p-cresol is lower than 0.1%, it is easy to be quickly consumed and the protection time is short. When the added content is higher than 0.1%, a part of the generated antioxidant free radicals is reoxidized by two free radicals to form a stable compound, and a part of 2,6-di-tert-butyl-p-cresol is further oxidized to form a stable compound. The free radicals formed by cresol may act as nucleophiles to promote the hydrolysis reaction between triaryl phosphate and water, resulting in the acid value of the phosphate fire-resistant oil sample to which 2,6-di-tert-butyl-p-cresol is added being higher than that without 2,6-di-tert-butyl-p-cresol as the oil ages further; benzofuranone compounds can capture some free radicals with high electronegativity. On the one hand, they can directly capture free radicals to reduce the content of free radicals in the oil; on the other hand, they can combine with free radicals formed by the reaction of 2,6-di-tert-butyl-p-cresol with active substances carrying free radicals in the oil to form stable compounds, thereby preventing the further development of the chain reaction; silicone compounds are silicone polymers with low surface tension and high surface activity. While reducing the surface tension of phosphate fire-resistant oil and eliminating foam, they can also cause compounds containing highly active free radicals to gather around them, facilitating the free radical compounds formed by the antioxidants that react with the active free radicals to combine with each other and form stable compounds, thereby preventing compounds containing free radicals from causing further deterioration of the oil. Therefore, adding the composite additive can improve the acid value, resistivity and sludge precipitation stability of the phosphate ester fire-resistant oil during use, reduce the tendency and stability of the foam characteristics of the phosphate ester fire-resistant oil, reduce the rate of increase in acid value and decrease in resistivity of the phosphate ester fire-resistant oil product, extend the operating time before sludge is generated, and make the foam characteristics of the fire-resistant oil sample meet the standard requirements, thereby extending the service life of the phosphate ester fire-resistant oil. Moreover, it has low cost, simple adding method, and high economic and social value.

[0020] The composite additive of the present invention contains 0.10% to 0.50% of 2,6-di-tert-butyl-p-cresol, 0.0050% to 0.0200% of benzofuranone compounds, and 0.0010% to 0.0030% of silicone compounds. The ratio is scientific and the advantages of different additives can be comprehensively utilized to form a synergistic effect, thereby more comprehensively and effectively solving the problems encountered in the use of phosphate fire-resistant oils.

[0021] The present invention also provides a method for improving the comprehensive performance of running phosphate ester fire-resistant oil, the addition amount of the composite additive is calculated according to the total oil volume in the phosphate ester fire-resistant oil system, and then the composite additive mother liquid is directly poured into the oil tank of the phosphate ester fire-resistant oil system, and the composite additive mother liquid gradually mixes with the running phosphate ester fire-resistant oil in the system as the system runs, and then it can play a role. The composite additive adding method of the present invention is simple, and by combining the characteristics of 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds, it can not only significantly slow down the increase in acid value and the decrease in resistivity of the running phosphate ester fire-resistant oil, but also effectively delay the generation of sludge and reduce the stability and tendency of foam characteristics. The application of this composite additive not only improves the comprehensive performance of phosphate ester fire-resistant oil, but also significantly enhances its stability, providing a strong guarantee for the safe and stable operation of steam turbine units in power plants. DETAILED DESCRIPTION

[0022] The technical solution of the present invention will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the present invention, unless otherwise specified, all the embodiments and preferred implementation methods mentioned herein can be combined with each other to form a new technical solution.

[0024] In the present invention, unless otherwise specified, all technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0025] In the present invention, unless otherwise specified, percentage (%) or part refers to the weight percentage or weight part relative to the composition.

[0026] In the present invention, unless otherwise specified, the components or preferred components involved can be combined with each other to form a new technical solution.

[0027] In the present invention, unless otherwise specified, the numerical range "a-b" represents an abbreviation of any real number combination between a and b, where a and b are real numbers. For example, the numerical range "6-22" means that all real numbers between "6-22" have been listed in this document, and "6-22" is just an abbreviation of these numerical combinations.

[0028] The “range” disclosed in the present invention is in the form of a lower limit and an upper limit, which can be one or more lower limits, and one or more upper limits, respectively.

[0029] In the present invention, the term "and / or" used herein refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] In the present invention, unless otherwise specified, each reaction or operation step can be carried out sequentially or in accordance with the sequence. Preferably, the reaction method herein is carried out sequentially.

[0031] Unless otherwise specified, the professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any method or material similar or equivalent to the described content may also be applied to the present invention.

[0032] The present invention provides a composite additive for improving the comprehensive performance of a phosphate ester fire-resistant oil, wherein the phosphate ester fire-resistant oil is specifically a triaryl phosphate ester fire-resistant oil, and the composite additive comprises 2,6-di-tert-butyl-p-cresol, a benzofuranone compound and a silicone compound;

[0033] Preferably, by weight percentage, the addition amount of 2,6-di-tert-butyl-p-cresol is 0.10% to 0.50% of the total oil in the phosphate ester fire-resistant oil system, the addition amount of benzofuranone compounds is 0.0050% to 0.0200% of the total oil in the phosphate ester fire-resistant oil system, and the addition amount of silicone compounds is 0.0010% to 0.0030% of the total oil in the phosphate ester fire-resistant oil system.

[0034] Among them, the manufacturer of 2,6-di-tert-butyl-p-cresol is Jinan Quanxing New Materials Co., Ltd., the benzofuranone compound can be dimethylbenzene dibutylbenzofuranone, the manufacturer is Wuhan Linqing Biotechnology Co., Ltd., and the manufacturer of silicone compounds is the silicone defoamer of Dongguan Defeng Defoamer Co., Ltd.

[0035] When the above composite additive is used to improve the comprehensive performance of phosphate ester fire-resistant oil, the specific steps are as follows:

[0036] Step 1: Calculate the addition amount of 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds according to the total oil amount in the phosphate ester fire-resistant oil system, wherein, by weight percentage, the addition amount of 2,6-di-tert-butyl-p-cresol is 0.10% to 0.50% of the total oil amount in the phosphate ester fire-resistant oil system, the addition amount of benzofuranone compounds is 0.0050% to 0.0200% of the total oil amount in the phosphate ester fire-resistant oil system, and the addition amount of silicone compounds is 0.0010% to 0.0030% of the total oil amount in the phosphate ester fire-resistant oil system.

[0037] Step 2: Add the weighed 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds into the solvent, heat to 60°C±5°C, and stir to obtain a composite additive mother solution;

[0038] Preferably, the solvent is a phosphate ester fire-resistant oil running in an appropriate amount of phosphate ester fire-resistant oil system.

[0039] Step 3: Pour the composite additive mother liquid directly into the oil tank of the phosphate ester fire-resistant oil system. As the phosphate ester fire-resistant oil system runs, the composite additive mother liquid is gradually mixed with the running phosphate ester fire-resistant oil in the system, thereby improving the anti-degradation performance and anti-foaming performance of the running phosphate ester fire-resistant oil, and has no adverse effect on other properties of the phosphate ester.

[0040] Example 1

[0041] The present invention provides a method for improving the comprehensive performance of running phosphate ester fire-resistant oil, and the specific steps are as follows:

[0042] Weigh 1000 g of running phosphate fire-resistant oil into a sample bottle;

[0043] Weigh 1.0000 g + 0.0001 g of 2,6-di-tert-butyl-p-cresol, 0.0500 g + 0.0001 g of benzofuranone compounds, and 0.01000 g + 0.0001 g of silicone compounds, and add them into a sample bottle;

[0044] After sealing the sample bottle, place it on a mixing device, which includes a vertically arranged triangular bracket, the bottom of which is fixed in a drying oven, a motor is arranged on the top of the triangular bracket, and the motor shaft is detachably connected to the sample bottle fixing plate. When the motor shaft is connected to the sample bottle fixing plate, the sample bottle fixing plate is driven by the motor to achieve continuous rotation in the vertical direction at a speed of 5r / min. A plurality of sample bottle fixing clamps are arranged along the circumference of the sample bottle fixing plate for fixing the bottle mouths of the plurality of sample bottles toward the center of the sample bottle fixing plate.

[0045] Preferably, the sample bottle fixing clamp comprises a bottle bottom fixing clamp, a bottle body fixing clamp and a bottle top fixing clamp, wherein the bottle top fixing clamp is a movable fixing clamp, which can prevent the sample bottle from falling off during rotation after being tightened.

[0046] Connect the sample bottle fixing plate with the sample bottle to the motor shaft, and rotate the sample in a drying oven at 60°C for 1 hour to ensure that the additive is dissolved in the running oil and mixed evenly. Take the sample out of the drying oven and cool it to room temperature to obtain a phosphate fire-resistant oil with improved comprehensive performance, which is recorded as sample No. 1.

[0047] Example 2

[0048] The present invention provides a method for improving the comprehensive performance of running phosphate ester fire-resistant oil, and the specific steps are as follows:

[0049] Weigh 1000 g of running phosphate fire-resistant oil into a sample bottle;

[0050] Weigh 5.0000 g + 0.0001 g of 2,6-di-tert-butyl-p-cresol, 0.2000 g + 0.0001 g of benzofuranone compounds and 0.03000 g + 0.0001 g of silicone compounds, and add them into a sample bottle;

[0051] After sealing the sample bottle, place it on a mixing device, which includes a vertically arranged triangular bracket, the bottom of which is fixed in a drying oven, a motor is arranged on the top of the triangular bracket, and the motor shaft is detachably connected to the sample bottle fixing plate. When the motor shaft is connected to the sample bottle fixing plate, the sample bottle fixing plate is driven by the motor to achieve continuous rotation in the vertical direction at a speed of 8r / min. A plurality of sample bottle fixing clamps are arranged along the circumference of the sample bottle fixing plate for fixing the bottle mouths of the plurality of sample bottles toward the center of the sample bottle fixing plate.

[0052] Preferably, the sample bottle fixing clamp comprises a bottle bottom fixing clamp, a bottle body fixing clamp and a bottle top fixing clamp, wherein the bottle top fixing clamp is a movable fixing clamp, which can prevent the sample bottle from falling off during rotation after being tightened.

[0053] Connect the sample bottle fixing plate with the sample bottles to the motor shaft, and rotate the sample in a drying oven at 65°C for 1 hour to ensure that the additives are dissolved in the base oil and mixed evenly. Take the sample out of the drying oven and cool it to room temperature to obtain a phosphate fire-resistant oil with improved comprehensive performance, which is recorded as sample No. 2.

[0054] Example 3

[0055] Weigh 1000 g of running phosphate fire-resistant oil into a sample bottle;

[0056] Weigh 3.0000 g + 0.0001 g of 2,6-di-tert-butyl-p-cresol, 0.1000 g + 0.0001 g of benzofuranone compounds and 0.02000 g + 0.0001 g of silicone compounds, and add them into a sample bottle;

[0057] After sealing the sample bottle, place it on a mixing device, which includes a vertically arranged triangular bracket, the bottom of which is fixed in a drying oven, a motor is arranged on the top of the triangular bracket, and the motor shaft is detachably connected to the sample bottle fixing plate. When the motor shaft is connected to the sample bottle fixing plate, the sample bottle fixing plate is driven by the motor to achieve continuous rotation in the vertical direction at a speed of 10r / min. A plurality of sample bottle fixing clamps are arranged along the circumference of the sample bottle fixing plate for fixing the bottle mouths of the plurality of sample bottles toward the center of the sample bottle fixing plate.

[0058] Preferably, the sample bottle fixing clamp comprises a bottle bottom fixing clamp, a bottle body fixing clamp and a bottle top fixing clamp, wherein the bottle top fixing clamp is a movable fixing clamp, which can prevent the sample bottle from falling off during rotation after being tightened.

[0059] Connect the sample bottle fixing plate with the sample bottles to the motor shaft, and rotate the sample in a drying oven at 55°C for 1 hour to ensure that the additives are dissolved in the base oil and mixed evenly. Take the sample out of the drying oven and cool it to room temperature to obtain a phosphate fire-resistant oil with improved comprehensive performance, which is recorded as sample No. 3.

[0060] The acid value, resistivity, oxidation stability, hydrolysis stability, air release value, foam characteristics, and sludge precipitation (qualitative) of the original phosphate ester fire-resistant oil and samples 1 to 3 were tested respectively. The test results are shown in Table 1:

[0061] Table 1 Test results of original phosphate fire-resistant oil and samples No. 1 to 3

[0062]

[0063] Note: The repeatability deviation of acid value is 0.02mgKOH / g, and the resistivity is greater than 1.0×10 10 Ω·cm, the repeatability is no more than 25% of the relative error, and the repeatability is no more than 0.7min when the air release value is less than 5min. Therefore, compared with the results of the original phosphate ester fire-resistant oil, the acid value, hydrolysis stability, and oxidation stability of samples 1 to 3 have a deviation within 0.02mgKOH / g; the resistivity deviation is within 1.7×10 10 When the air release value deviation is within 0.7min, it is considered that the additive has no negative impact on the original running phosphate ester fire-resistant oil.

[0064] The test results in Table 1 show that the additives of samples 1 to 3 can improve the antioxidant properties of the modified phosphate ester fire-resistant oil. Compared with the original running oil, the antioxidant performance is increased by more than 40% at most, the anti-hydrolysis performance is increased by more than doubled at most, and the anti-foaming performance meets the requirements of the new fire-resistant oil quality indicators. The new fire-resistant oil quality standard requires that the foam tendency is not more than 50mL. At the same time, it has no negative impact on the resistivity and air release value of the running phosphate ester fire-resistant oil, and can be further verified for stability.

[0065] Further stability verification of samples 1 to 3:

[0066] The closed cup aging test was carried out on the original phosphate fire-resistant oil and samples No. 1 to 3. The moisture content of samples No. 1 to 3 was adjusted to 300 mg / L±20 mg / L. During the aging test, samples were regularly sampled to test the acid value, resistivity and sludge precipitation. The test results are shown in Tables 2 to 4.

[0067] Table 2 Acid value test results of each sample during 115℃ closed cup aging test

[0068]

[0069] Table 3 Resistivity test results of each sample during 115℃ closed cup aging test

[0070]

[0071] Table 4 Detection results of sludge precipitation during the 115℃ closed cup aging test of each sample

[0072]

[0073] The test results in Tables 2 to 4 show that compared with the original phosphate ester fire-resistant oil, the deterioration tendency of the acid value, sludge and resistivity of samples No. 1, No. 2 and No. 3 during the aging process is smaller than that of the original phosphate ester fire-resistant oil.

[0074] Example 4

[0075] The prepared composite additive was added into a fire-resistant fuel system of Tongchuan Power Plant.

[0076] The adding process is as follows:

[0077] (1) Preparation of mother solution

[0078] First, 100L of oil sample was taken from the system and placed in a mixing tank, and another 2L of oil sample was taken as a comparison sample for laboratory testing. The total oil sample in the system was about 1.5 tons;

[0079] In terms of weight percentage, the amount of 2,6-di-tert-butyl-p-cresol added is 0.30% of the total oil in the phosphate ester fire-resistant oil system, the amount of benzofuranone compounds added is 0.0100% of the total oil in the phosphate ester fire-resistant oil system, and the amount of silicone compounds added is 0.0020% of the total oil in the phosphate ester fire-resistant oil system. The weights of the additives to be added are:

[0080] 4.5kg of 2,6-di-tert-butyl-p-cresol, 150g of benzofuranone compounds, and 30g of silicone compounds;

[0081] After weighing each additive, turn on the heating and stirring device of the mixing tank, heat the oil sample and keep it at a constant temperature of 60℃±3℃. After the oil temperature reaches 60℃±3℃, add the weighed additives in sequence from the feeding port on the top of the mixing tank. The liquid silicone compound needs to be rinsed with the oil sample in the system several times before adding to ensure that the additive is completely transferred. Then cover the feeding port and stir for 3 hours to ensure that each additive is evenly mixed with the oil sample to complete the preparation of the additive mother liquor.

[0082] (2) Use an external pump to pump the prepared mother liquid into the oil tank through the breathing hole on the top of the oil tank, and then circulate the system to mix evenly with the oil in the entire oil system.

[0083] (3) Test the acid value, resistivity, oxidation stability, hydrolysis stability, air release value, foam characteristics, and sludge precipitation (qualitative) of the original running oil sample. The test results are shown in Table 5:

[0084] After the oil system has been running for 6 months with additives added, samples are taken to test its acid value, resistivity, oxidation stability, hydrolysis stability, air release value, foam characteristics, and sludge precipitation (qualitative). The test results are shown in Table 5:

[0085] Table 5 Oil sample test results before and after addition

[0086]

[0087] The test results in Table 5 show that after adding the composite additive to a fire-resistant oil system in Tongchuan Power Plant, the oil's antioxidant properties were improved. Compared with the original operating oil, the antioxidant and hydrolysis resistance were both improved by about 40%, and the anti-foaming performance was well improved, meeting the quality index requirements of the composite operating oil. At the same time, it had no negative impact on the resistivity and air release value of the operating phosphate ester fire-resistant oil.

[0088] In summary, in the composite additive of the present invention, the addition amount of 2,6-di-tert-butyl-p-cresol is 0.10% to 0.50% of the total oil amount in the phosphate ester fire-resistant oil system, the addition amount of the benzofuranone compound is 0.0050% to 0.0200% of the total oil amount in the phosphate ester fire-resistant oil system, and the addition amount of the silicone compound is 0.0010% to 0.0030% of the total oil amount in the phosphate ester fire-resistant oil system. The above-mentioned composite additive is suitable for improving the antioxidant performance, hydrolysis resistance and anti-foaming performance of the running phosphate ester fire-resistant oil, and has no adverse effect on other properties of the phosphate ester fire-resistant oil.

Claims

1. A composite additive for improving the comprehensive performance of phosphate ester fire-resistant oil, characterized in that: The composite additive is a mixture of 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds.

2. The composite additive for improving the comprehensive performance of phosphate ester fire-resistant oil according to claim 1, characterized in that: Calculated by weight percentage, the addition amount of 2,6-di-tert-butyl-p-cresol is 0.10% to 0.50% of the total oil in the phosphate ester fire-resistant oil system, the addition amount of benzofuranone compounds is 0.0050% to 0.0200% of the total oil in the phosphate ester fire-resistant oil system, and the addition amount of silicone compounds is 0.0010% to 0.0030% of the total oil in the phosphate ester fire-resistant oil system.

3. The composite additive for improving the comprehensive performance of phosphate ester fire-resistant oil according to claim 1, characterized in that: By weight percentage, the addition amount of 2,6-di-tert-butyl-p-cresol is 0.30% of the total oil amount in the phosphate ester fire-resistant oil system, the addition amount of benzofuranone compounds is 0.0100% of the total oil amount in the phosphate ester fire-resistant oil system, and the addition amount of silicone compounds is 0.0020% of the total oil amount in the phosphate ester fire-resistant oil system.

4. The composite additive for improving the comprehensive performance of phosphate ester fire-resistant oil according to claim 1, characterized in that: The composite additive mother liquor is obtained by mixing 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds with a solvent. The composite additive mother liquor is added into a fuel tank of a phosphate ester fire-resistant fuel system and mixed with the running phosphate ester fire-resistant fuel to achieve the purpose of improving the comprehensive performance of the running phosphate ester fire-resistant fuel.

5. The composite additive for improving the comprehensive performance of phosphate ester fire-resistant oil according to claim 4, characterized in that: The 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds are mixed with a solvent at 60° C.±5° C. and stirred to obtain a composite additive mother solution.

6. A composite additive for improving the comprehensive performance of phosphate ester fire-resistant oil according to claim 4 or 5, characterized in that: The solvent is the phosphate ester fire-resistant oil running in the oil tank of the phosphate ester fire-resistant oil system.

7. A method for improving the comprehensive performance of running phosphate ester fire-resistant oil, characterized in that: The specific steps are as follows: S1 obtains the total amount of phosphate ester fire-resistant oil running in the oil tank of the phosphate ester fire-resistant oil system, and calculates the amount of composite additive added according to the total amount of oil, wherein the composite additive includes 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds; S2: adding calculated amounts of 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds into a solvent, and mixing them to obtain a composite additive mother solution; S3 adds the composite additive mother liquid into the fuel tank of the phosphate ester fire-resistant fuel system, and the composite additive mother liquid is mixed with the running phosphate ester fire-resistant fuel to improve the comprehensive performance of the running phosphate ester fire-resistant fuel.

8. A method for improving the comprehensive performance of phosphate ester fire-resistant oil according to claim 7, characterized in that: In S1, by weight percentage, the amount of 2,6-di-tert-butyl-p-cresol added is 0.10% to 0.50% of the total oil in the phosphate ester fire-resistant oil system, the amount of benzofuranone compounds added is 0.0050% to 0.0200% of the total oil in the phosphate ester fire-resistant oil system, and the amount of silicone compounds added is 0.0010% to 0.0030% of the total oil in the phosphate ester fire-resistant oil system.

9. A method for improving the comprehensive performance of phosphate ester fire-resistant oil according to claim 7, characterized in that: In S2, the 2,6-di-tert-butyl-p-cresol, benzofuranone compounds and silicone compounds are mixed with a solvent at 60° C.±5° C. and stirred to obtain a composite additive mother solution.

10. A method for improving the comprehensive performance of phosphate ester fire-resistant oil according to claim 7, characterized in that: In S2, the solvent is the phosphate ester fire-resistant oil running in the oil tank of the phosphate ester fire-resistant oil system.

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