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Steam turbine oil composite antioxidant as well as preparation method and addition method of steam turbine oil composite antioxidant

A composite antioxidant and turbine oil technology, which is applied in the field of turbine oil, can solve problems such as side reactions and adverse effects of oil quality, and achieve the effects of small changes in anti-emulsification performance, shallow oxidation stability, and good stability

Inactive Publication Date: 2015-05-13
XIAN THERMAL POWER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composite antioxidant composition uses benzotriazole derivatives as metal passivation (deactivation) agents, and it is easy to produce precipitation when used in combination with zinc dialkyldithiophosphate or carbamates, so the antioxidant Additives will bring other side reactions while improving the oxidation stability of lubricating oil, which will cause adverse effects on oil quality

Method used

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  • Steam turbine oil composite antioxidant as well as preparation method and addition method of steam turbine oil composite antioxidant
  • Steam turbine oil composite antioxidant as well as preparation method and addition method of steam turbine oil composite antioxidant
  • Steam turbine oil composite antioxidant as well as preparation method and addition method of steam turbine oil composite antioxidant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]Add 5.3g of mixed liquid shielding phenol, 4.2g of zinc dibutyldithiocarbamate and 1g of thiadiazole derivatives in 42g of formaldehyde aqueous solution (mass concentration 20%), and stir for 2h at 60°C and 500rm / min , and then moved into a stainless steel reactor, and reacted at 0.4MPa pressure and 150°C for 6h. The reaction product was taken out, moved to a distillation bottle for distillation and purification, and followed by crystallization and drying to obtain the composite antioxidant A for steam turbine oil.

[0042] At 60°C, the prepared turbine oil composite antioxidant A was added to a No. 46 turbine oil (additive amount 0.6wt%) for effect test, and the test results are shown in Table 1.

[0043] Table 1 Comparison of oil quality indexes before and after adding antioxidant A

[0044]

[0045]

Embodiment 2

[0047] In 54g of acetaldehyde aqueous solution (mass concentration 30%), add 4.8g of 2,6-di-tert-butyl-p-cresol, 4.6g of alkyl diphenylamine, 5.5g of zinc dibutyldithiocarbamate and 3.1g of hetero Cyclic derivatives were stirred at 60°C for 3h at a speed of 800rm / min. After mixing evenly, move it into a high-pressure reactor with distillation function for reaction and distillation. The distillation product is filtered to remove waste residue (liquid), and after purification, crystallization and drying, composite antioxidant B for steam turbine oil is obtained.

[0048] The prepared turbine oil composite antioxidant B was added to a certain No. 32 turbine oil at 55°C, the additive amount was 0.2wt%, and the anti-oxidation stability (rotational oxygen elasticity value) of the turbine oil before and after adding the antioxidant was tested. The results are shown in Table 2.

[0049] Table 2 Comparison of oil quality indexes before and after adding antioxidant B

[0050]

Embodiment 3

[0052] 9g alkyl diphenylamine, 4.8g N-phenyl-α-naphthylamine, 6.9g dialkyl dithiophosphoric acid mixture zinc and 2.3g heterocyclic derivatives are mixed, and with mass concentration be 35% formaldehyde aqueous solution (69g ) as a reaction reagent, stirred at 65°C and 650rm / min for 2h in a glass reactor with a stirring paddle, and then moved into a stainless steel autoclave. After replacing 2-3 times with nitrogen as a protective gas, the reaction was carried out at 0.5 MPa and 170° C. for 10 h. After the reaction is finished, it is often distilled under reduced pressure, purified, crystallized, and dried to obtain the composite antioxidant C for steam turbine oil.

[0053] At 65°C, the prepared turbine oil composite antioxidant C was added to a No. 32 turbine oil, the additive amount was 0.8wt%, and the antioxidant stability (rotational oxygen bomb value) of the turbine oil was tested before and after adding the antioxidant ) and other indicators. At the same time, the open...

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Abstract

The invention provides a steam turbine oil composite antioxidant as well as a preparation method and an addition method of the steam turbine oil composite antioxidant. The steam turbine oil composite antioxidant is composed of a free radical terminator, a peroxide decomposer and a metal passivator; the free radical terminator is a hindered phenol antioxidant, a hindered amine antioxidant or a phenol-amine compound containing a reactive hydrogen atom; the peroxide decomposer is a sulfide or a phosphite; the metal passivator is a thiadiazole derivative or a heterocyclic derivative; the weight percent ratio of the free radical terminator, the peroxide decomposer and the metal passivator is (35wt%-78wt%) to (16wt%-59wt%) to (0.5wt%-8wt%); the preparation method comprises the following steps: adding the free radical terminator, the peroxide decomposer and the metal passivator to an aldehyde solution, mixing evenly and then shifting the mixed solution into a reactor for reacting by controlling certain parameters and increasing both temperature and pressure, and after the reaction, distilling, washing, purifying, crystalizing and drying the product, thereby obtaining the finished antioxidant. The invention also provides an addition dosage and an addition process of the antioxidant to avoid the problem of operating oil precipitation or abnormal color due to self-oxidation of the antioxidant in the prior art.

Description

technical field [0001] The invention belongs to the technical field of steam turbine oil used in a steam turbine lubricating system in the electric power industry, and in particular relates to a composite antioxidant for steam turbine oil, a preparation method and an addition method thereof. Background technique [0002] When the steam turbine oil used in the steam turbine lubrication system of a power plant flows through relatively high-temperature parts such as bearings and bearing bushes, it is easy to oxidize and deteriorate, generating acidic substances, causing corrosion to system components and affecting the normal operation of equipment; at the same time, after the oil is oxidized Viscosity will increase, which will affect the working accuracy of steam turbine bearings and other components and increase energy consumption; after continuous deep oxidation, colloid and sludge will be formed in bearing passages, oil coolers, filters, main oil tanks and couplings, The acc...

Claims

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Application Information

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IPC IPC(8): C10M163/00C10N30/10C10N40/12
Inventor 刘永洛李烨峰王笑微王娟孙晓东
Owner XIAN THERMAL POWER RES INST CO LTD
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