CN114310143A - Method for repairing corrosion of sealing surface of compressor under strong acid working condition - Google Patents
Method for repairing corrosion of sealing surface of compressor under strong acid working condition Download PDFInfo
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- CN114310143A CN114310143A CN202111530926.8A CN202111530926A CN114310143A CN 114310143 A CN114310143 A CN 114310143A CN 202111530926 A CN202111530926 A CN 202111530926A CN 114310143 A CN114310143 A CN 114310143A
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- sealing
- compressor
- sealing surfaces
- cylinder body
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- 238000007789 sealing Methods 0.000 title claims abstract description 56
- 238000005260 corrosion Methods 0.000 title claims abstract description 19
- 230000007797 corrosion Effects 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002253 acid Substances 0.000 title description 2
- 238000009826 distribution Methods 0.000 claims abstract description 23
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 238000003754 machining Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 12
- 238000005498 polishing Methods 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 6
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 238000012795 verification Methods 0.000 claims description 3
- 230000004323 axial length Effects 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 14
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 5
- 229910017604 nitric acid Inorganic materials 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000012224 working solution Substances 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention belongs to the field of corrosion repair, and particularly provides a method for repairing a sealing surface matched with a cylinder body, a distribution plate and end covers at two sides of a CBW1-252 compressor after surface corrosion occurs. After assembly, a working fluid interface is plugged, water is added for leakage test, the sealing surface and the shaft seal are not leaked, the shaft seal is still not leaked by the rotor disc moving for several circles by using a turning tool, the repair machining precision of parts meets the assembly requirement, and the parts can be put into use after being successfully repaired.
Description
Technical Field
The invention belongs to the field of corrosion repair, and particularly relates to a method for repairing corrosion of a sealing surface of a compressor.
Background
Two CBW 1252-740 type liquid ring compressors used in a production device of a certain chemical industry enterprise compress nitrogen oxide gas generated in a smoke concentration device by using nitric acid with the concentration of less than 60% as working solution and send the nitrogen oxide gas to a smoke absorption tower for absorption, because the running temperature of the compressor reaches 80 ℃ after a unit is newly installed, the running temperature of the unit is reduced to about 50 ℃ after a heat exchanger and a cooler are additionally installed, but after the unit runs for one year, sealing surfaces between end covers and distributing plates on two sides of the compressor in the running process and sealing surfaces between a cylinder body and the distributing plates are corroded to cause leakage, and the working solution presents irregular leakage on the corroded sealing surfaces to cause the frequent switching of the two units for maintenance. The method has become a bottleneck restricting production and a difficult problem in equipment maintenance, and troubles operators and maintenance personnel.
When the compressor is disassembled and inspected, the rotor, the cylinder, the front distribution plate, the rear distribution plate, the end covers at two sides and the shaft sleeve of the compressor are all corroded; wherein, the sealing surfaces on two sides of the cylinder body of the compressor are corroded to generate large chamfers, the distribution plate and the end covers on two sides are corroded to be uneven sections with the length of 100mm, the sealing surfaces are corroded to be uneven, and the surfaces are porous.
No better solution is given by consulting after-market personnel of the manufacturer, and it is recommended to purchase the corroded parts of the compressor as spare parts for replacement, the purchase of the corroded spare parts is estimated to be more than 40 ten thousand yuan, and the delivery date is more than half a year.
The 304L material used by the nitrogen oxide compressor has certain temperature and nitric acid working solution concentration under the operation working condition, and the nitrogen oxide gas corrodes the surface of the part. The corrosion of the surface of the part can cause leakage during working, so that the overflow of nitric acid and nitric oxide gas can cause safety influence on surrounding personnel and equipment; the period of purchasing spare parts is long, and if the normal production is influenced because corroded parts cannot be purchased, the method is very uneconomical. The corrosion resistance research of 304L in nitric acid exists in China, but a repairing method for compressor parts corroded under the working condition of nitric acid working solution does not exist, and the compressor is repaired only by replacing new parts after the parts are corroded at present.
Disclosure of Invention
The invention aims to provide a method for repairing a sealing surface matched with a cylinder body, a distribution plate and end covers at two sides of a CBW1-252 compressor after surface corrosion occurs, which has the following specific technical scheme:
a method for repairing corrosion of a sealing surface of a compressor comprises the following steps:
a repair of corrosion of sealing surfaces on two sides of compressor cylinder
Firstly, drawing an assembly drawing of a CBW1-252 cylinder body, and measuring the outer diameters of sealing surfaces on two sides of the cylinder body along the axial length of the cylinder body; polishing oxide layers of sealing surfaces on two sides of a corroded cylinder body, adopting an argon arc welding wire made of 321 materials after polishing, performing surfacing welding on each side by using the argon arc welding wire to form machining allowance of 2mm along the direction of a shaft center line, ensuring that the cylinder body cannot be deformed when clamping is carried out on a lathe, ensuring that the sealing surfaces on two sides of the cylinder body are perpendicular to the shaft center line and the two sealing surfaces are parallel during turning, and performing injection protection on the sealing surfaces against collision during transportation after turning is completed;
b repair of corrosion on the surface of compressor end cover and distributing plate
After parts with corrosion and leakage on the sealing surfaces of the end cover and the distribution plate of the compressor are washed clean by clear water, the corroded surfaces are subjected to polishing treatment, before turning, alignment is required to be carried out on the sealing surfaces to ensure that the sealing surfaces are vertical to the axial center line of the parts, and for the distribution plate, the sealing surfaces on two sides, which are required to be turned, are vertical to the axial center line and are also required to be parallel to two surfaces;
c, because the mechanical sealing position of the shaft sealing working fluid is changed relatively when the end cover and the distribution plate sealing surface are turned and the parts are assembled, shaft sleeves, mechanical seals and hub sealing rings on two sides of a compressor shaft are prepared to avoid leakage of the shaft seal after assembly, and PTFE sealing gaskets between the end cover and the distribution plate and between the distribution plate and a cylinder body need to be replaced to ensure a long operation period after the compressor is assembled;
d. verification of reliability after assembly
After assembly, a working fluid interface is plugged, water is added for leakage test, the leakage phenomenon does not exist at the sealing surface and the shaft seal, the leakage phenomenon does not exist at the shaft seal position after the rotor disc moves for several circles by using a turning tool, the repair machining precision of parts meets the assembly requirement, and the parts can be put into use after the repair is successful.
The invention has the advantages of
The two compressors repaired by the method from 7 months in 2020 to 5 months in 2021 have no leakage phenomenon, and the effect is obvious. And the cost is saved.
Drawings
FIG. 1 is a view showing the construction of a compressor;
FIG. 2 is a drawing of the repaired cylinder block in the embodiment;
FIG. 3 is a drawing showing sealing surfaces on both sides of the end cap and the distribution plate in the embodiment;
FIG. 1-end cap 1, distributor plate 2, end cap seal 3, compressor cylinder seal 4, distributor plate seal 5
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1
The invention relates to a method for repairing the surface corrosion of the sealing surface matched between a cylinder body, a distribution plate and end covers at two sides of a CBW1-252 compressor, which is shown in a structure diagram 1 of the compressor,
the quality of the cylinder body part is the key for the successful repair of the unit.
Firstly, the oxide layers of the sealing surfaces on the two sides, which are corroded, are polished, after polishing, argon arc welding wires 321 are adopted, and 2mm machining allowance is formed in each side in a surfacing mode along the direction of the central line of the shaft by the aid of the argon arc welding wires, the cylinder body cannot be deformed when the cylinder body is clamped on a lathe, the sealing surfaces on the two sides are perpendicular to the central line of the shaft and parallel to the two sealing surfaces during turning, and the sealing surfaces are protected from colliding during transportation after turning. See FIG. 2
Repair of corrosion on surfaces of compressor end cover and distribution plate
The method comprises the steps of washing parts with corroded and leaked sealing surfaces of an end cover and a distribution plate of the compressor by clean water, polishing the corroded surfaces, aligning the sealing surfaces before turning to ensure that the sealing surfaces are perpendicular to the axial center line of the parts, and requiring that the sealing surfaces on two sides of the turning of the distribution plate are perpendicular to the axial center line and are parallel to two surfaces.
Assembly of parts
Because the mechanical seal position of the shaft seal working fluid can be changed relatively when the parts are assembled after the end cover and the distribution plate are turned, shaft sleeves, mechanical seals and hub seal rings on two sides of a compressor shaft are prepared for avoiding leakage of the shaft seal after the assembly, and PTFE seal gaskets between the end cover and the distribution plate and between the distribution plate and a cylinder body need to be replaced for ensuring a long operation period after the compressor is assembled. See FIG. 3
Verification of reliability after assembly
After assembly, a working fluid interface is plugged, water is added for leakage test, the sealing surface, the shaft seal position and the leakage phenomenon do not exist, the rotor disc is rotated for a plurality of circles by using a turning tool, the leakage phenomenon does not exist at the shaft seal position, the repair machining precision of parts meets the assembly requirement, and the parts can be put into use after the repair is successful.
The two compressors repaired by the method from 7 months in 2020 to 5 months in 2021 have no leakage phenomenon, and the effect is remarkable.
Claims (1)
1. The method for repairing the corrosion of the sealing surface of the compressor is characterized by comprising the following steps of:
a repair of corrosion of sealing surfaces on two sides of compressor cylinder
Firstly, drawing an assembly drawing of a CBW1-252 cylinder body, measuring the axial length of the cylinder body and the outer diameter of sealing surfaces on two sides of the cylinder body; polishing oxide layers of sealing surfaces on two sides of a corroded cylinder body, adopting 321 argon arc welding wires after polishing, performing surfacing welding on each side by using the argon arc welding wires to form machining allowance of 2mm along the direction of a shaft center line, ensuring that the cylinder body cannot be deformed when clamping on a lathe, ensuring that the sealing surfaces on two sides of the cylinder body are perpendicular to the shaft center line and the two sealing surfaces are parallel during turning, and intentionally protecting the sealing surfaces from colliding during transportation after turning;
b repair of corrosion on the surface of compressor end cover and distributing plate
After parts with corrosion and leakage on the sealing surfaces of the end cover and the distribution plate of the compressor are washed clean by clear water, the corroded surfaces are subjected to polishing treatment, before turning, alignment is required to be carried out on the sealing surfaces to ensure that the sealing surfaces are vertical to the axial center line of the parts, and for the distribution plate, the sealing surfaces on two sides, which are required to be turned, are vertical to the axial center line and are also required to be parallel to two surfaces;
c, because the mechanical sealing position of the shaft sealing working fluid is changed relatively when the end cover and the distribution plate sealing surface are turned and the parts are assembled, shaft sleeves, mechanical seals and hub sealing rings on two sides of a compressor shaft are prepared to avoid leakage of the shaft seal after assembly, and PTFE sealing gaskets between the end cover and the distribution plate and between the distribution plate and a cylinder body need to be replaced to ensure a long operation period after the compressor is assembled;
d. verification of reliability after assembly
After assembly, a working fluid interface is plugged, water is added for leakage test, the leakage phenomenon does not exist at the sealing surface and the shaft seal, the leakage phenomenon does not exist at the shaft seal position after the rotor disc moves for several circles by using a turning tool, the repair machining precision of parts meets the assembly requirement, and the parts can be put into use after the repair is successful.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111530926.8A CN114310143A (en) | 2021-12-14 | 2021-12-14 | Method for repairing corrosion of sealing surface of compressor under strong acid working condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111530926.8A CN114310143A (en) | 2021-12-14 | 2021-12-14 | Method for repairing corrosion of sealing surface of compressor under strong acid working condition |
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| CN114310143A true CN114310143A (en) | 2022-04-12 |
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| CN202111530926.8A Pending CN114310143A (en) | 2021-12-14 | 2021-12-14 | Method for repairing corrosion of sealing surface of compressor under strong acid working condition |
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| CN105345390A (en) * | 2015-12-10 | 2016-02-24 | 东方电气集团东方汽轮机有限公司 | Repairing method for split sealing surface of pressure resistant vessel |
| CN208246174U (en) * | 2017-12-29 | 2018-12-18 | 核动力运行研究所 | A kind of equipment repaired online suitable for main pump flange sealing surface |
| CN109590668A (en) * | 2019-01-07 | 2019-04-09 | 浙江翰德圣智能再制造技术有限公司 | A kind of steam turbine cylinder sealing surface renovation technique |
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| CN110883495A (en) * | 2019-11-21 | 2020-03-17 | 浙江翰德圣智能再制造技术有限公司 | Online repair process for rotary valve rotor sealing surface |
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| CN112439973A (en) * | 2020-11-20 | 2021-03-05 | 江苏核电有限公司 | Repair method for surfacing layer on sealing surface of Russian gate |
| CN112935480A (en) * | 2021-03-25 | 2021-06-11 | 安徽马钢设备检修有限公司 | Repairing device and repairing process for surface abrasion of large wheel fixing table base |
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2021
- 2021-12-14 CN CN202111530926.8A patent/CN114310143A/en active Pending
Patent Citations (20)
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| US5170589A (en) * | 1989-11-28 | 1992-12-15 | Valmet Paper Machinery Inc. | Method for reconditioning of the sealing face on a drying cylinder of a paper machine and device for reconditioning of the sealing face |
| US6412784B1 (en) * | 2000-05-26 | 2002-07-02 | The United States Of America As Represented By The Secretary Of The Navy | Split face mechanical seal system |
| US6364575B1 (en) * | 2000-09-07 | 2002-04-02 | Michael S. Bradley | Underwater pile repair jacket form |
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| CN104690482A (en) * | 2015-02-10 | 2015-06-10 | 上海平安高压调节阀门有限公司 | Repairing process of sealing surface of valve seat of high-pressure bypass main valve for ultra-supercritical thermal power generating unit |
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| CN208246174U (en) * | 2017-12-29 | 2018-12-18 | 核动力运行研究所 | A kind of equipment repaired online suitable for main pump flange sealing surface |
| CN109590668A (en) * | 2019-01-07 | 2019-04-09 | 浙江翰德圣智能再制造技术有限公司 | A kind of steam turbine cylinder sealing surface renovation technique |
| RU2729795C1 (en) * | 2019-06-24 | 2020-08-12 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный аграрный университет имени И.Т. Трубилина" | Method of restoration of necks of steel crankshafts |
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| CN110530641A (en) * | 2019-07-26 | 2019-12-03 | 国营芜湖机械厂 | A kind of aircraft generator cast housing leakaging repairment reliability test method |
| CN210335478U (en) * | 2019-07-30 | 2020-04-17 | 江苏金陵安全技术有限公司 | Surfacing, polishing and cleaning device for valve sealing surface repairing process |
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