CN116272109A - Transformer oil purifying method and system suitable for high-pressure vacuum equipment - Google Patents

Abstract

The invention provides a transformer oil purifying method and system suitable for high-pressure vacuum equipment, comprising the following steps: and (3) oil inlet step: introducing transformer oil in the oil storage tank or in high-pressure vacuum equipment to be treated into a heating system; hot oil step: heating transformer oil to a preset temperature; dehydrating and degassing: forming mist and then membranous in a vacuum separator to separate moisture and gas in the transformer oil from the transformer oil, and then collecting moisture and exhausting gas through a cooling condensing system; and (3) oil filtering: the method comprises the steps of performing primary impurity removal and filtration on transformer oil before a hot oil step, and performing secondary and tertiary impurity removal and filtration on the transformer oil after a dehydration and degassing step; oiling: and introducing the purified transformer oil into the bottom of the high-pressure vacuum equipment to be treated. The invention can improve the purification efficiency of the transformer oil suitable for high-pressure vacuum equipment.

Description

Transformer oil purifying method and system suitable for high-pressure vacuum equipment

Technical Field

The invention relates to the technical field of oil filtration of high-pressure vacuum equipment, in particular to a transformer oil purification method and system suitable for the high-pressure vacuum equipment.

Background

Under the superposition of heat and electric field, the transformer oil is gradually oxidized to generate various oxides, alcohols, aldehydes, acids and the like after contacting with oxygen, and finally insoluble colloid and sludge are formed to be precipitated and separated out. These acidic substances reduce the insulating properties of the transformer, and therefore the transformer oil must be subjected to a filtration treatment.

In the prior art, due to the reasons similar to leakage of a system, poor sealing, long-term heat load of oil, open oil storage and the like, moisture and gas in air are settled in transformer oil, so that the moisture and gas in the transformer oil are caused. Typically, untreated transformer oil contains moisture: 50-60 ppm, air content: 10% -20%.

In order to achieve the index of transformer oil, a method or system for achieving the purpose of oil filtration of transformer oil is needed.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, the present invention is to provide a method and a system for purifying transformer oil suitable for high-pressure vacuum equipment, which can select one of two oil supply modes, realize a cyclic dehydration degassing function and a cyclic oil filtering function, and improve the purifying efficiency of transformer oil suitable for high-pressure vacuum equipment.

In order to solve the technical problems, the invention provides a transformer oil purifying method suitable for high-pressure vacuum equipment, which comprises the following steps:

and (3) oil inlet step: introducing transformer oil in the oil storage tank or high-pressure vacuum equipment to be treated into a heating system by utilizing the pressure difference effect of a pipeline of an oil delivery system;

hot oil step: heating the transformer oil to a preset temperature, and introducing the transformer oil subjected to heating treatment into a vacuum separator;

dehydrating and degassing: forming mist and then membranous in a vacuum separator to separate moisture and gas in the transformer oil from the transformer oil, and then collecting moisture and exhausting gas through a cooling condensing system; detecting the transformer oil subjected to dehydration and degassing treatment, if the transformer oil is qualified, introducing the transformer oil into an oil outlet pipeline, and if the transformer oil is unqualified, introducing the transformer oil into a heating system again until the transformer oil meets the preset dehydration and degassing index;

and (3) oil filtering: performing primary impurity removal and filtration on the transformer oil before the hot oil step, performing secondary impurity removal and filtration on the transformer oil after the dehydration and degassing step, detecting the transformer oil subjected to the tertiary impurity removal and filtration, if the transformer oil is qualified, introducing the transformer oil into an oiling system, and if the transformer oil is unqualified, performing tertiary impurity removal and filtration on the transformer oil again until the transformer oil meets preset impurity removal indexes;

Oiling: introducing the purified transformer oil into the bottom of high-pressure vacuum equipment to be treated, and discharging gas and bubbles in the high-pressure vacuum equipment by utilizing a liquid level overflow principle to complete the whole purification process.

Preferably, the method for purifying transformer oil suitable for high-pressure vacuum equipment further comprises the step of vacuumizing: vacuumizing high-pressure vacuum equipment to be treated through a vacuum system, closing the vacuum system if the current vacuum degree meets the preset vacuum degree, and then executing the oil inlet step.

Preferably, the vacuumizing step further comprises: and the drying gas obtained in the vacuumizing step and the drying gas obtained in the dehydration and degassing step are mutually converged and then discharged together.

Preferably, the oiling step further comprises: and vacuumizing the high-pressure vacuum equipment to be treated through a vacuum system, and taking out impurities in the high-pressure vacuum equipment.

Preferably, the method for purifying transformer oil suitable for high-pressure vacuum equipment further comprises a self-circulation step: detecting transformer oil in the high-pressure vacuum equipment, and ending if the transformer oil is qualified; and if the transformer oil is unqualified, reintroducing the transformer oil into the oil delivery system until the transformer oil in the high-pressure vacuum equipment meets the preset purification index.

Preferably, the hot oil step further comprises: and monitoring the current temperature of the transformer oil in real time, and switching the forced heating system to a shutdown state if the current temperature of the transformer oil exceeds the pre-warning temperature.

Preferably, the dehydration and degassing step further comprises: and cooling the mixed gas discharged from the top of the vacuum separator, refluxing the liquid transformer oil into the vacuum separator, condensing the cooled water vapor into water, and finally discharging the dried gas.

Preferably, the oil feeding step further includes: and if the transformer oil in the high-pressure vacuum equipment is detected to be introduced into the heating system, stopping the oil storage tank from conveying the transformer oil outwards.

The invention also provides a complete transformer oil purifying and circulating system for realizing the transformer oil purifying method, which comprises the following steps:

high-pressure vacuum equipment to be treated;

the oil storage tank is internally stored with transformer oil required by high-pressure vacuum equipment;

the oil delivery system is provided with an oil filtering system, the oil delivery system comprises an oil inlet pipeline and an oil outlet pipeline, the inlet end of the oil inlet pipeline is divided into a first oil inlet branch pipe and a second oil inlet branch pipe, the first oil inlet branch pipe is communicated with an oil storage tank, the second oil inlet branch pipe is communicated with the top of high-pressure vacuum equipment, and the outlet end of the oil outlet pipeline is indirectly communicated with the bottom of the high-pressure vacuum equipment through the oil injection system;

The heating system comprises a hot oil pipeline, an electric heater arranged on the hot oil pipeline and an electric heating temperature controller for controlling the electric heater, and the inlet end of the hot oil pipeline is communicated with the outlet end of the oil inlet pipeline;

the top of the vacuum separator is communicated with the outlet end of the hot oil pipeline, and the bottom of the vacuum separator is communicated with the inlet end of the oil outlet pipeline;

the vacuum system comprises a vacuum exhaust pipeline with a gas-liquid separation function, and the inlet end of the vacuum exhaust pipeline is communicated with the top of the high-pressure vacuum equipment;

the cooling condensing system comprises a condensing air extraction pipeline with a gas-liquid separation function, the inlet end of the condensing air extraction pipeline is communicated with the top of the vacuum separator, and the outlet end of the condensing air extraction pipeline and the outlet end of the vacuum exhaust pipeline are mutually combined and then are jointly connected with an exhaust structure.

Preferably, the oil filtering system comprises a primary filter, a secondary filter, a fine filter and a first circulating pipeline, wherein the primary filter is arranged in an oil inlet pipeline, the secondary filter and the fine filter are sequentially arranged in an oil outlet pipeline, the inlet end of the first circulating pipeline is communicated with the outlet end of the oil outlet pipeline, the outlet end of the first circulating pipeline is communicated with the inlet end of the oil inlet pipeline, and a first circulating switch valve is arranged on the first circulating pipeline; the oiling system comprises an oiling pipeline, wherein the inlet end of the oiling pipeline is communicated with the outlet end of the oil outlet pipeline, the outlet end of the oiling pipeline is communicated with the bottom of the high-pressure vacuum equipment, and an oiling valve is arranged on the oiling pipeline.

As described above, the method and the system for purifying the transformer oil suitable for the high-pressure vacuum equipment have the following beneficial effects: the transformer oil purifying method suitable for the high-pressure vacuum equipment mainly comprises an oil inlet step, a hot oil step, a dehydration and degassing step, an oil filtering step and an oil injection step. Wherein, the oil inlet step: the transformer oil in the oil storage tank or the high-pressure vacuum equipment to be treated is introduced into the heating system by utilizing the pressure difference effect of the pipeline of the oil conveying system, so that the transformer oil to be purified can be provided from two paths, and generally, the transformer oil in the oil storage tank is firstly introduced into the heating system, and then the transformer oil in the high-pressure vacuum equipment can be introduced into the heating system according to the further purification requirement, so that a closed circulation purification mode is formed; hot oil step: the transformer oil is heated to a preset temperature, and the transformer oil after the heating treatment is introduced into a vacuum separator, so that the transformer oil has good fluidity, water in the oil is conveniently in a boiling state, and the next step of evaporation and the acceleration of the flow of oil are facilitated; dehydrating and degassing: the transformer oil is firstly atomized and then filmed in the vacuum separator so as to separate moisture and gas in the transformer oil from the transformer oil, and then the moisture and gas are collected and discharged through a cooling condensing system, so that the moisture and gas can be efficiently discharged and part of the transformer oil can be refluxed into the vacuum separator; detecting the transformer oil subjected to dehydration and degassing treatment, if the transformer oil is qualified, introducing the transformer oil into an oil outlet pipeline, and if the transformer oil is unqualified, introducing the transformer oil into a heating system again until the transformer oil meets the preset dehydration and degassing index, thereby ensuring the purity degree of the transformer oil; and (3) oil filtering: the method comprises the steps of performing primary impurity removal and filtration on transformer oil before a hot oil step, filtering large-particle impurities, performing secondary impurity removal and tertiary impurity removal and filtration on the transformer oil after a dehydration and degassing step, filtering fine impurities and ultrafine particle impurities, detecting the transformer oil subjected to tertiary impurity removal and filtration, if the transformer oil is qualified, introducing the transformer oil into an oiling system, and if the transformer oil is unqualified, performing tertiary impurity removal and filtration on the transformer oil again until the transformer oil meets preset impurity removal indexes, and further guaranteeing the purity degree of the transformer oil; oiling: introducing the purified transformer oil into the bottom of high-pressure vacuum equipment to be treated, and discharging gas and bubbles in the high-pressure vacuum equipment by utilizing a liquid level overflow principle to complete the whole purification process. Therefore, the transformer oil purifying method suitable for the high-pressure vacuum equipment can select one of two oil supply modes, realize the functions of circulating dehydration and degassing and circulating oil filtering, and improve the purifying efficiency of the transformer oil suitable for the high-pressure vacuum equipment.

Drawings

FIG. 1 is a schematic diagram of a complete transformer oil purification and circulation system according to the present invention;

FIG. 2 shows a schematic diagram of a heating system;

FIG. 3 shows a schematic view of a vacuum separator;

FIG. 4 shows a schematic diagram of a cooling condensing system;

FIG. 5 shows a schematic diagram of a vacuum system;

FIG. 6 shows a schematic diagram of an oil filtration system;

FIG. 7 shows a schematic diagram of an oiling system;

fig. 8 shows a flow chart of a method for purifying transformer oil suitable for use in a high-pressure vacuum apparatus.

Description of element reference numerals

1. High-pressure vacuum equipment

2. Oil storage tank

3. Oil delivery system

31. Oil inlet pipeline

311. First oil inlet branch pipe

312. Second oil inlet branch pipe

312a equipment oil outlet valve

312b flow sensor

32. Oil outlet pipeline

321. Oil outlet pump

322. Check valve

4. Heating system

41. Hot oil pipeline

411. Hot oil switch valve

412. Hot oil bypass valve

42. Electric heater

43. Electrothermal temperature controller

5. Vacuum separator

51. Separator housing

52. Oil film atomizer

53. Defoaming device

54. Float switch

6. Vacuum system

61. Vacuum exhaust pipeline

611. Vacuum switch valve

612. Second steam valve

613. Vacuum isolating valve

614. Second vacuum gauge

615. Second vacuum gauge

62. Second air pump

63. Exhaust pipeline

64. Exhaust gas filter

65. Second condenser

66. Second air extraction filter

67. Second reservoir

671. Second block valve

672. Second blow-down valve

673. Second air leakage valve

7. Cooling condensing system

71. Condensation air extraction pipeline

711. First vacuum gauge

712. First steam valve

72. First air pump

73. Cooling device

731. First vacuum gauge

732. Foam sensor

74. First condenser

75. Ripple compensator

76. First air extraction filter

77. First reservoir

771. First block valve

772. First blow-down valve

773. First air leakage valve

8. Oil filtering system

81. Primary filter

811. Primary filtering blow-down valve

82. Two-stage filter

821. Two-stage pressure gauge

822. Two-stage pressure controller

823. Two-stage blow-down valve

83. Fine filter

831. Fine filtering pressure gauge

832. Fine filtering pressure controller

833. Fine filtering blow-down valve

84. First circulation pipeline

841. First circulation switch valve

85. Second circulation pipeline

851. Second circulation switch valve

9. Oiling system

91. Oil injection pipeline

911. Oil filling valve

912. Sampling valve

913. Oiling flowmeter

92. Oil discharge pipeline

921. Oil drain valve

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for the purpose of understanding and reading the disclosure, and are not intended to limit the scope of the invention, which is defined by the appended claims, but rather by the claims, unless otherwise indicated, and unless otherwise indicated, all changes in structure, proportions, or otherwise, used by those skilled in the art, are included in the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.

In fig. 1, straight arrows indicate the flow direction of transformer oil, and curved arrows indicate the flow direction of gas.

As shown in fig. 1 and 8, the present invention provides a method for purifying transformer oil suitable for high-pressure vacuum equipment, comprising the steps of:

and (3) oil inlet step: introducing transformer oil in the oil storage tank 2 or the high-pressure vacuum equipment 1 to be treated into the heating system 4 by utilizing the pressure difference effect of a pipeline of the oil conveying system 3;

Hot oil step: heating the transformer oil to a preset temperature, and introducing the transformer oil subjected to heating treatment into a vacuum separator 5;

dehydrating and degassing: forming mist and then membranous in the vacuum separator 5 to separate moisture and gas in the transformer oil from the transformer oil, and then collecting moisture and exhausting gas through the cooling condensing system 7; detecting the dehydrated and degassed transformer oil, if the transformer oil is qualified, introducing the transformer oil into an oil outlet pipeline 32, and if the transformer oil is unqualified, introducing the transformer oil into a heating system 4 again until the transformer oil meets the preset dehydration and degassing index;

and (3) oil filtering: performing primary impurity removal and filtration on the transformer oil before the hot oil step, performing secondary impurity removal and filtration on the transformer oil after the dehydration and degassing step, detecting the transformer oil subjected to the tertiary impurity removal and filtration, if the transformer oil is qualified, introducing the transformer oil into an oiling system 9, and if the transformer oil is unqualified, performing tertiary impurity removal and filtration on the transformer oil again until the transformer oil meets preset impurity removal indexes;

oiling: the purified transformer oil is introduced into the bottom of the high-pressure vacuum equipment 1 to be treated, and the gas and bubbles in the high-pressure vacuum equipment 1 are discharged by utilizing the liquid level overflow principle, so that the whole purification process is completed.

The transformer oil purifying method suitable for the high-pressure vacuum equipment mainly comprises an oil inlet step, a hot oil step, a dehydration and degassing step, an oil filtering step and an oil injection step. Wherein, the oil inlet step: the transformer oil in the oil storage tank 2 or the high-pressure vacuum equipment 1 to be treated is led into the heating system 4 by utilizing the pressure difference effect of the pipeline of the oil transportation system 3, so that the transformer oil to be purified can be provided from two paths, generally, the transformer oil in the oil storage tank 2 is firstly led into the heating system 4, and then the transformer oil in the high-pressure vacuum equipment 1 can be led into the heating system 4 according to the further purification requirement, thereby forming a closed circulation purification mode; hot oil step: the transformer oil is heated to a preset temperature, and the transformer oil after the heating treatment is introduced into the vacuum separator 5, so that the transformer oil has good fluidity, and the water in the oil is in a boiling state, thereby facilitating the next evaporation and accelerating the flow of the oil; dehydrating and degassing: the transformer oil is atomized in the vacuum separator 5 and then forms a film so as to separate moisture and gas in the transformer oil from the transformer oil, and then the moisture and gas are collected and discharged through the cooling condensing system 7, so that the moisture and gas can be discharged efficiently and part of the transformer oil can be returned to the vacuum separator 5; detecting the dehydrated and degassed transformer oil, if the transformer oil is qualified, introducing the transformer oil into an oil outlet pipeline 32, and if the transformer oil is unqualified, introducing the transformer oil into a heating system 4 again until the transformer oil meets the preset dehydration and degassing index, thereby ensuring the purity degree of the transformer oil; and (3) oil filtering: the method comprises the steps of performing primary impurity removal and filtration on transformer oil before a hot oil step, filtering large-particle impurities, performing secondary impurity removal and tertiary impurity removal and filtration on the transformer oil after a dehydration and degassing step, filtering fine impurities and ultrafine particle impurities, detecting the transformer oil subjected to tertiary impurity removal and filtration, if the transformer oil is qualified, introducing the transformer oil into an oiling system 9, and if the transformer oil is unqualified, performing tertiary impurity removal and filtration on the transformer oil again until the transformer oil meets preset impurity removal indexes, and further ensuring the purity degree of the transformer oil; oiling: the purified transformer oil is introduced into the bottom of the high-pressure vacuum equipment 1 to be treated, and the gas and bubbles in the high-pressure vacuum equipment 1 are discharged by utilizing the liquid level overflow principle, so that the whole purification process is completed.

Therefore, the transformer oil purifying method suitable for the high-pressure vacuum equipment can select one of two oil supply modes, realize the functions of circulating dehydration and degassing and circulating oil filtering, and improve the purifying efficiency of the transformer oil suitable for the high-pressure vacuum equipment 1.

In order to effectively exhaust the gas and other impurities of the high-pressure vacuum apparatus 1, the above-mentioned transformer oil purifying method suitable for the high-pressure vacuum apparatus further comprises a vacuumizing step: vacuumizing the high-pressure vacuum equipment 1 to be treated through the vacuum system 6, closing the vacuum system 6 if the current vacuum degree meets the preset vacuum degree, and then executing the oil inlet step.

In order to simplify the pipeline structure, the vacuumizing step further comprises: and the drying gas obtained in the vacuumizing step and the drying gas obtained in the dehydration and degassing step are mutually converged and then discharged together.

In order to further discharge the gas and other impurities of the high-pressure vacuum apparatus 1, the oiling step further includes: the high-pressure vacuum apparatus 1 to be treated is evacuated by the vacuum system 6, and impurities inside the high-pressure vacuum apparatus 1 are carried out.

If the transformer oil in the high-pressure vacuum equipment 1 needs to be further purified, the method for purifying the transformer oil suitable for the high-pressure vacuum equipment further comprises the self-circulation step of: detecting transformer oil in the high-pressure vacuum equipment 1, and ending if the transformer oil is qualified; if the transformer oil is unqualified, the transformer oil is reintroduced into the oil delivery system 3 until the transformer oil in the high-pressure vacuum equipment 1 meets the preset purification index.

In order to control the heating temperature, the hot oil step further comprises: the current temperature of the transformer oil is monitored in real time, and if the current temperature of the transformer oil exceeds the pre-warning temperature, the forced heating system 4 is switched to a shutdown state.

In order to separate transformer oil, moisture and gas in sequence, the dehydration and degassing step further comprises: the mixed gas discharged from the top of the vacuum separator 5 is cooled, the liquid transformer oil is refluxed into the vacuum separator 5, the cooled water vapor is condensed into water, and finally the dried gas is discharged.

In order to form the closed cycle purge mode, the oil feeding step further includes: if it is detected that the transformer oil in the high-pressure vacuum apparatus 1 is introduced into the heating system 4, the oil storage tank 2 is stopped from feeding the transformer oil outward.

As shown in fig. 1 to 7, the present invention further provides a complete transformer oil purifying and circulating system for implementing the above transformer oil purifying method, including:

a high-pressure vacuum apparatus 1 to be treated;

the oil storage tank 2 is used for storing transformer oil required by the high-pressure vacuum equipment 1 in the oil storage tank 2;

the oil delivery system 3, the oil filtration system 8 is arranged on the oil delivery system 3, the oil delivery system 3 comprises an oil inlet pipeline 31 and an oil outlet pipeline 32, the inlet end of the oil inlet pipeline 31 is divided into a first oil inlet branch pipe 311 and a second oil inlet branch pipe 312, the first oil inlet branch pipe 311 is communicated with the oil storage tank 2, the second oil inlet branch pipe 312 is communicated with the top of the high-pressure vacuum equipment 1, and the outlet end of the oil outlet pipeline 32 is indirectly communicated with the bottom of the high-pressure vacuum equipment 1 through the oil injection system 9;

The heating system 4, the heating system 4 includes a hot oil pipeline 41, an electric heater 42 arranged on the hot oil pipeline 41, and an electric heating temperature controller 43 for controlling the electric heater 42, wherein an inlet end of the hot oil pipeline 41 is communicated with an outlet end of the oil inlet pipeline 31;

the top of the vacuum separator 5 is communicated with the outlet end of the hot oil pipeline 41, and the bottom of the vacuum separator 5 is communicated with the inlet end of the oil outlet pipeline 32;

the vacuum system 6, the vacuum system 6 includes the vacuum exhaust pipeline 61 with gas-liquid separation function, the inlet end of the vacuum exhaust pipeline 61 is communicated with the top of the high-pressure vacuum equipment 1;

the cooling and condensing system 7, the cooling and condensing system 7 comprises a condensing air suction pipeline 71 with a gas-liquid separation function, the inlet end of the condensing air suction pipeline 71 is communicated with the top of the vacuum separator 5, and the outlet end of the condensing air suction pipeline 71 and the outlet end of the vacuum exhaust pipeline 61 are mutually combined and then are commonly connected with an exhaust structure.

Further, the oil filtering system 8 includes a primary filter 81, a secondary filter 82, a fine filter 83, and a first circulation pipeline 84, wherein the primary filter 81 is disposed in the oil inlet pipeline 31, the secondary filter 82 and the fine filter 83 are sequentially disposed in the oil outlet pipeline 32, an inlet end of the first circulation pipeline 84 is communicated with an outlet end of the oil outlet pipeline 32, an outlet end of the first circulation pipeline 84 is communicated with an inlet end of the oil inlet pipeline 31, and a first circulation switch valve 841 is disposed on the first circulation pipeline 84; the oil injection system 9 includes an oil injection pipeline 91, an inlet end of the oil injection pipeline 91 is connected to an outlet end of the oil outlet pipeline 32, an outlet end of the oil injection pipeline 91 is connected to a bottom of the high-pressure vacuum apparatus 1, and an oil injection valve 911 is provided on the oil injection pipeline 91.

The complete transformer oil purification and circulation system is described in detail and is roughly divided into a transformer oil filtration and injection circulation system and a transformer oil dehydration and degassing circulation system. Namely:

as shown in fig. 1, 6 and 7, the transformer oil filtering and oiling circulation system suitable for the high-pressure vacuum equipment includes:

a high-pressure vacuum apparatus 1 to be treated;

the oil storage tank 2 is used for storing transformer oil required by the high-pressure vacuum equipment 1 in the oil storage tank 2;

the oil delivery system 3, the oil delivery system 3 comprises an oil inlet pipeline 31 and an oil outlet pipeline 32, the inlet end of the oil inlet pipeline 31 is divided into a first oil inlet branch pipe 311 and a second oil inlet branch pipe 312, the first oil inlet branch pipe 311 is communicated with the oil storage tank 2, the second oil inlet branch pipe 312 is communicated with the top of the high-pressure vacuum equipment 1, and a dehydration and degassing pipeline structure is arranged between the outlet end of the oil inlet pipeline 31 and the inlet end of the oil outlet pipeline 32;

the oil filtering system 8, the oil filtering system 8 comprises a primary filter 81, a secondary filter 82, a fine filter 83 and a first circulation pipeline 84, the primary filter 81 is arranged in the oil inlet pipeline 31, the secondary filter 82 and the fine filter 83 are sequentially arranged in the oil outlet pipeline 32, the inlet end of the first circulation pipeline 84 is communicated with the outlet end of the oil outlet pipeline 32, the outlet end of the first circulation pipeline 84 is communicated with the inlet end of the oil inlet pipeline 31, and a first circulation switch valve 841 is arranged on the first circulation pipeline 84;

The oiling system 9, the oiling system 9 includes an oiling pipeline 91, an inlet end of the oiling pipeline 91 is communicated with an outlet end of the oil outlet pipeline 32, an outlet end of the oiling pipeline 91 is communicated with the bottom of the high-pressure vacuum equipment 1, and an oiling valve 911 is arranged on the oiling pipeline 91.

The technical problem to be solved by the transformer oil filtering and oiling circulating system is to remove impurities in the transformer oil and complete oiling work to the high-pressure vacuum equipment 1. The transformer oil filtration and oiling circulation system adopts a three-stage circulation filtration mode: when the oil filtering and filling circulation system of the transformer oil works, the oil storage tank 2 supplies the transformer oil outwards, and the transformer oil flows into the oil inlet pipeline 31 under the action of the internal and external pressure difference. Firstly, the transformer oil flows into a primary filter 81, and large-particle impurities are filtered out to finish the first filtration; then, the transformer oil flows into the dehydration and degassing pipeline structure to finish dehydration and degassing; next, the dehydrated and degassed transformer oil flows into and out of the oil pipeline 32, and then flows through the secondary filter 82 and the fine filter 83 in sequence, and fine impurities and ultrafine particle impurities are filtered, so that the second and third filtration is completed. The transformer oil is then tested at the outlet end of the oil outlet line 32, and if the transformer oil does not meet the filtration requirements, the transformer oil may again flow back to the inlet end of the oil inlet line 31 via the first circulation line 84. In the circulating filtration, the transformer oil is subjected to three times of filtration treatment again until the transformer oil meets the filtration and purification requirements; the filtered transformer oil enters the bottom of the high-pressure vacuum equipment 1 to be treated through the oil injection pipeline 91 of the oil injection system 9, and gas and bubbles inside the high-pressure vacuum equipment 1 can be discharged through the liquid level overflow principle, so that the whole purification oil injection process is completed. Specifically, in the oil filtration system 8, a primary filter 81, a secondary filter 82, and a fine filter 83

The impurity removal load of each stage of filter element is shared according to a preset proportion by using a step-by-step encryption and filtration mode, and the realization of cleanliness is ensured by adopting a reasonable fluid design, so that fine particles in the transformer oil are deeply filtered. And electrostatic adsorption can be adopted, so that negative charge carriers which are not easy to remove can be adsorbed with positive charges to achieve charge balance, impurities can be removed thoroughly, and high index requirements of transformer oil can be effectively ensured. For example, the filter precision of the filtered transformer oil reaches 0.5 mu m particle, the nano-pollution amount is large, and the beta value is 5000. In the oil filling system 9, an oil filling valve 911 is provided in the oil filling line 91. For example, when the oil injection valve 911 is closed, the transformer oil filtration and oil injection circulation system is switched to the circulation filtration mode, and when the oil injection valve 911 is opened, the transformer oil filtration and oil injection circulation system is switched to the oil injection mode.

Therefore, the transformer oil filtering and oiling circulating system suitable for the high-pressure vacuum equipment can realize a three-stage circulating filtering function and a switching function between an oiling mode and a circulating mode, simplify pipeline arrangement and filtering operation, improve the structural compactness of the system and improve the filtering and purifying efficiency of the high-pressure vacuum equipment 1.

As shown in fig. 7, in order to facilitate sampling to detect whether the transformer oil meets the standard, a sampling valve 912 is further provided on the oil injection line 91, and the sampling valve 912 is located upstream of the oil injection valve 911.

As shown in fig. 1 and 6, in order to make the transformer oil flow into the secondary filter 82 after passing through the process flow of multiple dehydration and deaeration, the oil filtering system 8 further includes a second circulation pipe 85, an inlet end of the second circulation pipe 85 is connected to the oil outlet pipe 32 at an upstream position of the secondary filter 82, an outlet end of the second circulation pipe 85 is connected to the oil inlet pipe 31 at a downstream position of the primary filter 81, and a second circulation switch valve 851 is provided on the second circulation pipe 85.

As shown in fig. 7, in order to detect the flow rate of the high-pressure vacuum apparatus 1, the oil injection line 91 is further provided with an oil injection flowmeter 913.

In order to facilitate the introduction of the filtered transformer oil out of the transformer oil filtration and lubrication circulation system, the lubrication system 9 further includes a drain pipe 92, an inlet end of the drain pipe 92 is connected to an outlet end of the oil outlet pipe 32, and an oil drain valve 921 is disposed on the drain pipe 92.

As shown in fig. 1, in order to switch the first oil inlet branch pipe 311 and the second oil inlet branch pipe 312, the second oil inlet branch pipe 312 is provided with a device oil outlet valve 312a and a flow sensor 312b. When the transformer oil filtering and oiling circulation system is used, the first oil inlet branch pipe 311 is closed when the transformer oil in the second oil inlet branch pipe 312 is detected to flow, and at the moment, the transformer oil filtering and oiling circulation system is in a closed circulation working mode.

In order to avoid the backflow phenomenon of the transformer oil, the oil outlet pipe 32 is provided with an oil outlet pump 321 and a check valve 322, and the oil outlet pump 321 and the check valve 322 are both located at the upstream of the secondary filter 82.

As shown in fig. 6, the primary filter 81 is provided with a primary filter drain valve 811 for facilitating the discharge of sludge components such as filter residues.

In order to facilitate the adjustment of the filtration pressure of the secondary filter 82 and the discharge of sludge components such as filter residues, a secondary pressure gauge 821, a secondary pressure controller 822, and a secondary drain valve 823 are provided on the secondary filter 82.

In order to facilitate the adjustment of the filtration pressure of the fine filter 83 and the discharge of sludge components such as filter residues, a fine filtration pressure gauge 831, a fine filtration pressure controller 832, and a fine filtration drain valve 833 are provided on the fine filter 83.

As shown in fig. 1, 2, 3, 4 and 5, the technical problem to be solved by the above-mentioned transformer oil dehydration and degassing circulation system is to remove moisture and gas in the transformer oil, and further to rapidly evacuate gas and bubbles in the high-pressure vacuum equipment 1. The transformer oil dehydration and degasification circulating system adopts an oil conveying system 3, a heating system 4, a vacuum separator 5, a vacuum system 6 and a cooling and condensing system 7 which are integrated into a whole to cooperatively filter oil: first, the vacuum system 6 performs vacuum pumping of the high-pressure vacuum apparatus 1 to be processed, and when the vacuum degree reaches the requirement, the vacuum exhaust line 61 of the vacuum system 6 is closed. Furthermore, the oil storage tank 2 is supplied with transformer oil outwards, the transformer oil to be treated flows into the electric heater 42 of the heating system 4 for heat exchange under the pressure effect, the transformer oil has good fluidity through heating, and the water in the oil is in a boiling state conveniently, so that the next evaporation and the acceleration of the flow of oil are facilitated. The electrothermal temperature controller 43 can monitor the heating temperature of the electric heater 42 in real time and control the electric heater 42 to work within a set heating temperature range; when the heating temperature of the electric heater 42 exceeds the protection set point, the overtemperature protector of the heating system 4 works, so that the electric heater 42 is turned off, and the safety and reliability of the heating system 4 are ensured. Then, the transformer oil flows into the vacuum separator 5, and in the vacuum separator 5, the transformer oil is fully sprayed and atomized to form a film shape, and the contact area of the transformer oil in the vacuum separator 5 is greatly increased, so that the moisture and gas in the transformer oil can obtain enough vaporization time to achieve the optimal dehydration and degassing effect. Then, the cooling condensing system 7 condenses the high-temperature and high-temperature water vapor and other gases evaporated in the vacuum separator 5 to remove water and dry, thereby ensuring that the finally discharged gases do not contain water vapor. In short, the high-pressure vacuum apparatus 1 to be treated is first vacuumized by the vacuum system 6, and the oil tank 2 is waited for oil supply. Next, the transformer oil flows through the oil inlet line 31, the heating system 4, the vacuum separator 5 and the oil outlet line 32 in order to achieve dehydration and degassing, and at the same time, the cooling condensing system 7 achieves gas-liquid separation to ensure that the discharged gas is dried. The transformer oil is then tested at the oil outlet line 32 and, if it does not meet the dehydration degassing requirements, can be recirculated from the top of the high-pressure vacuum apparatus 1 into the oil inlet line 31. In the circulation, the transformer oil is dehydrated and degassed again until the transformer oil meets the dehydration and degassing requirements; the dehydrated and degassed transformer oil enters the bottom of the high-pressure vacuum equipment 1 to be treated, and gas and bubbles can flow out from the top of the high-pressure vacuum equipment 1 through a liquid level overflow principle, so that the gas and the bubbles in the high-pressure vacuum equipment 1 are discharged, and the whole purification oiling process is completed. In the dehydration and degassing operation process, the vacuum system 6 can be in a high vacuum state continuously or periodically, so that the transformer oil can be purified, and the high-pressure vacuum equipment 1 to be treated can be vacuumized and the internal impurities can be carried out, so that the oil product is ensured to be clean.

As a use method of the transformer oil dehydration and degassing circulation system, the following steps are adopted:

when the system starts to work, the transformer oil in the high-pressure vacuum equipment 1 or the transformer oil in the oil storage tank 2 firstly flows into the oil inlet pipeline 31 under the action of internal and external pressure difference (a primary filter can be arranged on the oil inlet pipeline 31); then enters an electric heater 42 of a heating system 4 to exchange heat, the heated transformer oil continuously enters a vacuum separator 5, the oil in the vacuum separator 5 is formed into mist first and then into film shape, the contact area in vacuum is enlarged to hundreds of times of the original contact area, and the water in the oil is quickly vaporized under the conditions of high heat, high vacuum degree, large surface and high pumping speed and is discharged by a cooling condensing system 7; the dehydrated and degassed transformer oil flows into an oil outlet pipeline 32 (a secondary filter and a fine filter can be arranged on the oil outlet pipeline 32), and if the transformer oil flowing out of the oil outlet pipeline 32 is purified oil after the transformer oil is detected to be qualified, the whole oil purification process is completed; if the detection is failed, the transformer oil also needs to flow into the oil inlet pipeline 31 again through the high-pressure vacuum equipment 1, and the process is circulated.

The dehydrated and degassed transformer oil enters the bottom of the high-pressure vacuum equipment 1 to be treated, can flow out from the top of the high-pressure vacuum equipment 1 to be treated through a liquid level overflow principle, and can discharge gas and bubbles in the high-pressure vacuum equipment 1. At this time, the top of the high-pressure vacuum apparatus 1 is continuously evacuated by the vacuum exhaust line 61 of the vacuum system 6, so that the inside gas and bubbles can be conveniently and rapidly overflowed.

The transformer oil flowing out from the top of the high-pressure vacuum equipment 1 to be treated returns to the oil inlet pipeline 31, at the moment, the first oil inlet branch pipe 311 is closed, the transformer oil dehydration and degassing circulation system is in a closed circulation mode, and the transformer oil dehydration and degassing circulation system enters a circulation dehydration and degassing treatment timing mode.

And after the circulation time reaches the set circulation time, stopping the transformer oil dehydration and degasification circulation system to finish the whole purification and oiling process.

So far, the main innovation point of the transformer oil dehydration and degassing circulation system can be obtained:

firstly, the transformer oil of the high-pressure vacuum equipment 1 or the oil storage tank 2 can be selectively led into the oil inlet pipeline 31 to realize dehydration and degassing; when the first oil inlet branch pipe 311 is cut off, the transformer oil dehydration and degassing circulation system is switched to a closed circulation mode, so that the oil filtering operation is simplified, the pipeline butt joint step is omitted, the dehydration and degassing efficiency of the transformer oil is greatly improved, and the oil filtering period of the high-pressure vacuum equipment 1 is shortened;

secondly, the outlet end of the condensation pumping pipeline 71 and the outlet end of the vacuum exhaust pipeline 61 are connected with an exhaust structure after being mutually combined, so that the pipeline arrangement is greatly simplified, and the compactness of the system architecture is improved;

thirdly, the transformer oil dehydration and degassing circulation system adopts various physical means to carry out high-efficiency dehydration and degassing and vacuum three-dimensional evaporation on the transformer oil, so that the components and the service performance of the transformer oil are not affected, the oil filtration is safe and efficient, and the normal operation of the high-pressure vacuum equipment 1 can be effectively ensured.

Therefore, the transformer oil dehydration and degassing circulation system can realize the circulation dehydration and degassing function on the transformer oil, simplify the pipeline arrangement and the oil filtering operation, improve the structural compactness of the system and improve the oil filtering efficiency of the high-pressure vacuum equipment 1.

As shown in fig. 1, 4 and 5, in order to improve the overall compactness of the vacuum system 6 and the cooling and condensing system 7, the cooling and condensing system 7 further includes a first pump 72 provided in a condensing pump line 71, the vacuum system 6 further includes a second pump 62 provided in a vacuum exhaust line 61, the exhaust structure includes an exhaust line 63 and an exhaust filter 64, the exhaust line 63 is simultaneously connected to the first pump 72 and the second pump 62, and the exhaust filter 64 is provided in the exhaust line 63.

As shown in fig. 4, in order to realize the gas-liquid separation function of the cooling and condensing system 7, the condensation air extraction line 71 is provided with a cooler 73, a first condenser 74, a ripple compensator 75, and a first air extraction filter 76, which are sequentially arranged in the air flow direction, and a first reservoir 77 is provided at the bottom of the first condenser 74. In use, a cooling return line is also provided between the cooler 73 and the vacuum separator 5. The mixed gas flowing into the cooler 73 necessarily also contains a small part of the vaporized oil, which is cooled again in the cooler 73 to liquid oil, which can then be returned again to the vacuum separator 5 via the cooling return line. The first condenser 74 includes an upper gas accumulation zone and a lower water flow accumulation zone. After the mixed gas separated by the flash evaporation technology flows into the first condenser 74, the water vapor is cooled into a liquid state in the first condenser 74, and is sunk and collected in a water flow collecting area at the lower layer of the first condenser 74, and meanwhile, the gas is upwardly diffused and collected in a gas collecting area at the upper layer. The first condenser 74 is connected to the bellows compensator 75 at the position of the gas collecting region through a pipe, and finally the air separated in the first condenser 74 is discharged. The water separated in the first condenser 74 flows from the bottom into the first reservoir 77.

In order to collect water conveniently, the inlet end of the first liquid reservoir 77 is provided with a first block valve 771, the outlet end of the first liquid reservoir 77 is provided with a first drain valve 772, and the first liquid reservoir 77 is provided with a first air seepage valve 773.

The cooler 73 is provided with a first vacuum gauge 731 and a foam sensor 732, and the condensation pump line 71 is further provided with a first vacuum gauge 711 and a first steam valve 712. The first vacuum gauge 731 and the first vacuum gauge 711 can detect the degree of vacuum. The foam sensor 732 may detect how much foam is in the cooler 73 and the first vapor valve 712 may draw vapor in the condensate suction line 71.

As shown in fig. 5, in order to facilitate rapid evacuation of the gas and bubbles in the high-pressure vacuum apparatus 1, the vacuum exhaust line 61 is provided with a vacuum switch valve 611, a second vapor valve 612, a vacuum shut-off valve 613, a second condenser 65, and a second suction filter 66, which are sequentially arranged in the direction of the air flow, and a second reservoir 67 is provided at the bottom of the second condenser 65.

In order to detect the vacuum degree of different parts of the vacuum exhaust pipeline 61, a second vacuum gauge 614 and a second vacuum gauge 615 are further arranged on the vacuum exhaust pipeline 61, the second vacuum gauge 614 is located between the vacuum switch valve 611 and the second vapor valve 612, and the second vacuum gauge 615 is located between the second vapor valve 612 and the second condenser.

In order to collect water conveniently, the inlet end of the second liquid reservoir 67 is provided with a second isolating valve 671, the outlet end of the second liquid reservoir 67 is provided with a second drain valve 672, and the second liquid reservoir 67 is provided with a second air seepage valve 673.

As shown in fig. 3, in order to remove gas and moisture in the transformer oil, the vacuum separator 5 includes a separator housing 51, and an oil film atomizer 52, a defoaming device 53, and a float switch 54 are disposed in the inner cavity of the separator housing 51 in this order from top to bottom. In addition, a liquid level display assembly is provided on one side of the separator housing 51.

As shown in fig. 2, to ensure that the hot oil line 41 described above is continuously delivering transformer oil. The hot oil pipeline 41 is also provided with a hot oil switch valve 411 and a hot oil bypass valve 412, the hot oil switch valve 411 and the hot oil bypass valve 412 are both positioned between the electric heater 42 and the vacuum separator 5, and the hot oil switch valve 411 and the hot oil bypass valve 412 are mutually connected in parallel. In addition, a hot oil drain valve is provided at the bottom of the electric heater 42.

In summary, the invention can select one of two oil supply modes, realize the functions of cyclic dehydration and degasification and cyclic oil filtration, and improve the purification efficiency of the transformer oil suitable for high-pressure vacuum equipment. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. The transformer oil purifying method suitable for the high-pressure vacuum equipment is characterized by comprising the following steps of:

and (3) oil inlet step: introducing transformer oil in the oil storage tank (2) or in the high-pressure vacuum equipment (1) to be treated into the heating system (4) by utilizing the pressure difference effect of a pipeline of the oil conveying system (3);

hot oil step: heating the transformer oil to a preset temperature, and introducing the transformer oil subjected to heating treatment into a vacuum separator (5);

dehydrating and degassing: forming mist-like transformer oil in a vacuum separator (5) and then forming a film so as to separate moisture and gas in the transformer oil from the transformer oil, and then collecting moisture and exhausting the gas through a cooling condensing system (7); detecting the dehydrated and degassed transformer oil, if the transformer oil is qualified, introducing the transformer oil into an oil outlet pipeline (32), and if the transformer oil is unqualified, introducing the transformer oil into a heating system (4) again until the transformer oil meets the preset dehydration and degassing index;

And (3) oil filtering: performing primary impurity removal and filtration on the transformer oil before the hot oil step, performing secondary impurity removal and filtration on the transformer oil after the dehydration and degassing step, detecting the transformer oil subjected to the tertiary impurity removal and filtration, if the transformer oil is qualified, introducing the transformer oil into an oiling system (9), and if the transformer oil is unqualified, performing tertiary impurity removal and filtration on the transformer oil again until the transformer oil meets preset impurity removal indexes;

oiling: introducing the purified transformer oil into the bottom of high-pressure vacuum equipment (1) to be treated, and discharging gas and bubbles in the high-pressure vacuum equipment (1) by utilizing a liquid level overflow principle to complete the whole purification process.

2. The method for purifying transformer oil suitable for high-pressure vacuum equipment according to claim 1, wherein: the transformer oil purifying method suitable for the high-pressure vacuum equipment further comprises the step of vacuumizing: vacuumizing the high-pressure vacuum equipment (1) to be treated through the vacuum system (6), closing the vacuum system (6) if the current vacuum degree meets the preset vacuum degree, and then executing the oil inlet step.

3. The method for purifying transformer oil suitable for high-pressure vacuum equipment according to claim 2, wherein: the vacuumizing step further comprises the following steps: and the drying gas obtained in the vacuumizing step and the drying gas obtained in the dehydration and degassing step are mutually converged and then discharged together.

4. The method for purifying transformer oil suitable for high-pressure vacuum equipment according to claim 1, wherein: the oiling step further comprises: and vacuumizing the high-pressure vacuum equipment (1) to be treated through a vacuum system (6) and taking out impurities in the high-pressure vacuum equipment (1).

5. The method for purifying transformer oil suitable for high-pressure vacuum equipment according to claim 1, wherein: the transformer oil purifying method suitable for the high-pressure vacuum equipment further comprises the self-circulation steps of: detecting transformer oil in the high-pressure vacuum equipment (1), and ending if the transformer oil is qualified; and if the transformer oil is unqualified, reintroducing the transformer oil into the oil delivery system (3) until the transformer oil in the high-pressure vacuum equipment (1) meets the preset purification index.

6. The method for purifying transformer oil suitable for high-pressure vacuum equipment according to claim 1, wherein: the hot oil step further comprises: and monitoring the current temperature of the transformer oil in real time, and switching the forced heating system (4) to a shutdown state if the current temperature of the transformer oil exceeds the pre-warning temperature.

7. The method for purifying transformer oil suitable for high-pressure vacuum equipment according to claim 1, wherein: the dehydration and degassing step further comprises: and (3) cooling the mixed gas discharged from the top of the vacuum separator (5), refluxing the liquid transformer oil into the vacuum separator (5), condensing the cooled water vapor into water, and finally discharging the dried gas.

8. The method for purifying transformer oil suitable for high-pressure vacuum equipment according to claim 1, wherein: the oil inlet step further comprises the following steps: when the transformer oil in the high-pressure vacuum equipment (1) is detected to be introduced into the heating system (4), the oil storage tank (2) stops conveying the transformer oil outwards.

9. A complete transformer oil purification and circulation system for implementing the method for purifying transformer oil according to any one of claims 1 to 8, comprising:

a high-pressure vacuum apparatus (1) to be treated;

the oil storage tank (2), the inside of the oil storage tank (2) stores transformer oil required by the high-pressure vacuum equipment (1);

the oil conveying system (3), the oil filtering system (8) is arranged on the oil conveying system (3), the oil conveying system (3) comprises an oil inlet pipeline (31) and an oil outlet pipeline (32), the inlet end of the oil inlet pipeline (31) is divided into a first oil inlet branch pipe (311) and a second oil inlet branch pipe (312), the first oil inlet branch pipe (311) is communicated with the oil storage tank (2), the second oil inlet branch pipe (312) is communicated with the top of the high-pressure vacuum equipment (1), and the outlet end of the oil outlet pipeline (32) is indirectly communicated with the bottom of the high-pressure vacuum equipment (1) through the oil injection system (9);

the heating system (4) comprises a hot oil pipeline (41), an electric heater (42) arranged on the hot oil pipeline (41) and an electric heating temperature controller (43) for controlling the electric heater (42), and the inlet end of the hot oil pipeline (41) is communicated with the outlet end of the oil inlet pipeline (31);

The top of the vacuum separator (5) is communicated with the outlet end of the hot oil pipeline (41), and the bottom of the vacuum separator (5) is communicated with the inlet end of the oil outlet pipeline (32);

the vacuum system (6), the vacuum system (6) comprises a vacuum exhaust pipeline (61) with a gas-liquid separation function, and the inlet end of the vacuum exhaust pipeline (61) is communicated with the top of the high-pressure vacuum equipment (1);

the cooling condensing system (7), the cooling condensing system (7) comprises a condensing air suction pipeline (71) with a gas-liquid separation function, the inlet end of the condensing air suction pipeline (71) is communicated with the top of the vacuum separator (5), and the outlet end of the condensing air suction pipeline (71) and the outlet end of the vacuum exhaust pipeline (61) are mutually combined and then are jointly connected with an exhaust structure.

10. The transformer oil complete machine purification and circulation system according to claim 9, wherein:

the oil filtering system (8) comprises a primary filter (81), a secondary filter (82), a fine filter (83) and a first circulating pipeline (84), wherein the primary filter (81) is arranged on an oil inlet pipeline (31), the secondary filter (82) and the fine filter (83) are sequentially arranged on an oil outlet pipeline (32), the inlet end of the first circulating pipeline (84) is communicated with the outlet end of the oil outlet pipeline (32), the outlet end of the first circulating pipeline (84) is communicated with the inlet end of the oil inlet pipeline (31), and a first circulating switch valve (841) is arranged on the first circulating pipeline (84);

The oiling system (9) comprises an oiling pipeline (91), the inlet end of the oiling pipeline (91) is communicated with the outlet end of the oil outlet pipeline (32), the outlet end of the oiling pipeline (91) is communicated with the bottom of the high-pressure vacuum equipment (1), and an oiling valve (911) is arranged on the oiling pipeline (91).

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