CN114215843A - Method for reducing TRT thrust bearing temperature - Google Patents
Method for reducing TRT thrust bearing temperature Download PDFInfo
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- CN114215843A CN114215843A CN202111413994.6A CN202111413994A CN114215843A CN 114215843 A CN114215843 A CN 114215843A CN 202111413994 A CN202111413994 A CN 202111413994A CN 114215843 A CN114215843 A CN 114215843A
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- pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/04—Sliding-contact bearings for exclusively rotary movement for axial load only
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/74—Sealings of sliding-contact bearings
- F16C33/741—Sealings of sliding-contact bearings by means of a fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C37/00—Cooling of bearings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention relates to a method for reducing TRT thrust bearing temperature, and belongs to the technical field of adjustment methods of blast furnace supporting facilities of iron and steel enterprises. The technical scheme of the invention is as follows: reaming a lubricating oil inlet hole and an oil return hole of the thrust bearing, trimming an oil baffle of the thrust bearing and a shaft end gap, and increasing the circulating amount of lubricating oil; according to the structure of the equipment, the nitrogen sealing is adjusted by combining actual process parameters, so that the effects of reducing forward thrust and improving reverse thrust are achieved; the high-pressure side and the low-pressure side of the sewage discharge pipeline are communicated, so that the pressure of the high-pressure side and the low-pressure side is balanced, and the reverse thrust is improved. The invention has the beneficial effects that: the auxiliary thrust pad counteracts the axial force, thereby reducing the temperature of the thrust pad.
Description
Technical Field
The invention relates to a method for reducing TRT thrust bearing temperature, and belongs to the technical field of adjustment methods of blast furnace supporting facilities of iron and steel enterprises.
Background
The blast furnace gas residual pressure generator set, TRT for short, is arranged behind a blast furnace, blast furnace raw gas is dedusted by gravity, and after being dedusted by a wet method or a dry method, the energy of high-pressure (high-temperature) clean gas is utilized to drive a generator to generate electricity, and the high-pressure (high-temperature) clean gas is depressurized (cooled) and then sent into a low-pressure gas pipe network.
The TRT thrust bearing bush is used for balancing the axial thrust of a rotor, is arranged on a turbine shaft system and has the function of protecting the shaft displacement of the shaft system within a design range, and two sets of interlocking heavy fault points are arranged on the thrust bearing bush, one is the shaft displacement, the other is the bearing temperature, and the bearing temperature is too high or the displacement is too large (exceeds a stop value), so that the unit can execute an emergency stop program. Generally, the alarm shutdown of the generator set is caused by the fact that the forward displacement or the forward thrust tile temperature is abnormal, and the reverse displacement and the reverse thrust tile temperature are ignored due to the forward force action of high-pressure gas of the generator set.
The TRT thrust pad mechanical structure comprises a bearing body seat, a bearing body, a thrust disc, a forward and reverse thrust pad, a temperature displacement probe, an adjusting gasket, an oil baffle and the like. As shown in fig. 1 and 2, a thrust bearing body and a thrust pad. In the running process of the unit, the acting force of a thrust disc arranged on a shafting is applied to a forward thrust pad, heat generated by friction between the thrust disc and the thrust pad is circularly taken away by lubricating oil of the unit, and in the rated running state of the unit, the temperature of the thrust pad is within the design range and cannot reach an alarm value (105 ℃) or a shutdown value (115 ℃). If the front pressure of the unit does not reach the rated 190kpa, the thrust bearing temperature is alarmed and even stopped, and the unit cannot generate power in a rated mode, so that the benefit is affected. The thrust pads are required to be processed by the system, so that the temperature is reduced, and the unit can generate power in a rated mode.
Disclosure of Invention
The invention aims to provide a method for reducing TRT thrust pad temperature, which adopts the measures of reaming a lubricating oil inlet hole and an oil return hole of a thrust bearing, trimming the gap between an oil baffle of the thrust bearing and the shaft end, adjusting nitrogen seal, communicating sewage pipes at two sides of high pressure and low pressure, assisting the thrust pad to offset axial force, thereby reducing the thrust pad temperature and effectively solving the problems in the background technology.
The technical scheme of the invention is as follows: a method of reducing TRT thrust pad temperature, comprising the steps of:
(1) reaming the lubricating oil inlet hole and the oil return hole of the thrust bearing to increase the circulation volume of cooling lubricating oil; the oil baffle of the thrust bearing and the shaft end gap are trimmed, and the cooling lubricating oil circulation amount is increased;
(2) according to the structure of the equipment, the nitrogen sealing is adjusted by combining actual process parameters, so that the effects of reducing forward thrust and improving reverse thrust are achieved;
(3) the high-pressure side and low-pressure side sewage pipes are communicated to balance the high-pressure side and low-pressure side pressures and improve the reverse thrust.
In the step (2), the nitrogen gas seal comprises a high-pressure nitrogen gas seal and a low-pressure nitrogen gas seal, each nitrogen gas seal comprises a fine seal and a coarse seal, the fine seal acts on the carbon ring, the coarse seal acts on the comb teeth, and during adjustment, the fine seals of the high-pressure nitrogen gas seal and the low-pressure nitrogen gas seal are opened.
In the step (3), a high-pressure blow-off pipeline is connected to a low-pressure gas pipe network at the high-pressure side, and a high-pressure blow-off valve is normally opened; at the low pressure side, nitrogen is led to a low pressure sewage pipeline, and a low pressure sewage valve is normally opened.
The invention has the beneficial effects that: through taking to carry out reaming to thrust bearing lubricating oil inlet hole and oil gallery, keep off with the axle head clearance to thrust bearing self oil, adjust nitrogen gas seal, with the measure of high pressure and low pressure both sides blowdown pipeline UNICOM, supplementary thrust tile offsets the axial force to reduce thrust tile temperature.
Drawings
FIG. 1 is a pictorial view of a thrust bearing body of the present invention;
FIG. 2 is a pictorial view of a thrust pad of the present invention;
FIG. 3 is a schematic illustration of the TRT shafting of the present invention;
in the figure: the device comprises a thrust tile 1, a thrust disc 2, a low-pressure nitrogen seal 3, a high-pressure nitrogen seal 4, a low-pressure blow-down valve 5, a high-pressure blow-down valve 6, nitrogen 7 and a thrust direction 8.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
A method of reducing TRT thrust pad temperature, comprising the steps of:
(1) reaming the lubricating oil inlet hole and the oil return hole of the thrust bearing to increase the circulation volume of cooling lubricating oil; the oil baffle of the thrust bearing and the shaft end gap are trimmed, and the cooling lubricating oil circulation amount is increased;
(2) according to the structure of the equipment, the nitrogen sealing is adjusted by combining actual process parameters, so that the effects of reducing forward thrust and improving reverse thrust are achieved;
(3) the high-pressure side and low-pressure side sewage pipes are communicated to balance the high-pressure side and low-pressure side pressures and improve the reverse thrust.
In the step (2), the nitrogen gas seal comprises a high-pressure nitrogen gas seal and a low-pressure nitrogen gas seal, each nitrogen gas seal comprises a fine seal and a coarse seal, the fine seal acts on the carbon ring, the coarse seal acts on the comb teeth, and during adjustment, the fine seals of the high-pressure nitrogen gas seal and the low-pressure nitrogen gas seal are opened.
In the step (3), a high-pressure blow-off pipeline is connected to a low-pressure gas pipe network at the high-pressure side, and a high-pressure blow-off valve is normally opened; at the low pressure side, nitrogen is led to a low pressure sewage pipeline, and a low pressure sewage valve is normally opened.
In practical application, firstly, a lubricating oil supply system is measured and calculated, under an allowable condition, an oil inlet hole and an oil return hole of lubricating oil of the thrust bearing are reamed, and the circulation volume of the cooling lubricating oil is increased; secondly, the oil baffle of the thrust bearing and the shaft end clearance are trimmed, and the purpose is to increase the circulation amount of lubricating oil.
Related utilization and transformation of unit shafting pollution discharge and nitrogen seal
Considering the related auxiliary structure of the TRT shaft system, the temperature of the thrust bearing is reduced by adopting various methods, for example, as shown in figure 3, a sealing structure for sealing gas is arranged, a forced nitrogen pipeline is arranged outside the sealing structure to prevent gas leakage, a blowoff valve is arranged on each of the high-pressure nitrogen seal and the low-pressure nitrogen seal, the blowoff valves are respectively a high-pressure blowoff valve and a low-pressure blowoff valve, the pressure of the gas is right high pressure and left low pressure, as shown in figure 3, the thrust direction is marked, and if the temperature of the thrust bearing is reduced, the force in the thrust direction of the shaft system rotor is reduced, or the force in the reverse thrust direction is applied. In short, it is tried to reduce the force of the rotor from right to left or increase the force from left to right, how to achieve: firstly, two types of high-pressure nitrogen seals and two types of low-pressure nitrogen seals are respectively provided, wherein the fine seal acts on a carbon ring, the coarse seal acts on comb teeth, the fine seal can seal coal gas generally, only the fine seals on the high-pressure side and the low-pressure side are opened when the gas burner is used, on the basis, the coarse seal of the low-pressure nitrogen seal is opened, the pressure of nitrogen acts on the comb teeth, which is equivalent to that a force from left to right is added on the outlet side, and the thrust tile temperature can be reduced by nearly 10 ℃ by the operation; and secondly, a drain valve is arranged below the nitrogen seal, and the two drain valves are opened periodically to drain dirt in the seal and then closed in the daily operation. The invention utilizes two blowoff valves to carry out sealed blowoff of high-pressure nitrogen, connects a high-pressure blowoff pipeline to a low-pressure gas pipe network, and the high-pressure blowoff valve is normally opened, which is equivalent to the pressure relief of the gas pressure entering the high-pressure side comb teeth to the low-pressure gas pipe network, namely, the force from right to left is reduced. In addition, at the low pressure side, connect and draw nitrogen gas to low pressure sewage pipes, normally open low pressure blowoff valve, the pressure of nitrogen gas gets into from the blow off pipe and acts on sealed tooth piece, has increased a power from a left side to the right in other words, and the transformation of high pressure blowoff valve and low pressure blowoff valve utilizes can be close 5 ℃ with the reduction of tile temperature again.
Claims (3)
1. A method of reducing TRT thrust pad temperature, comprising the steps of:
(1) reaming the lubricating oil inlet hole and the oil return hole of the thrust bearing to increase the circulation volume of cooling lubricating oil; the oil baffle of the thrust bearing and the shaft end gap are trimmed, and the cooling lubricating oil circulation amount is increased;
(2) according to the structure of the equipment, the nitrogen sealing is adjusted by combining actual process parameters, so that the effects of reducing forward thrust and improving reverse thrust are achieved;
(3) the high-pressure side and low-pressure side sewage pipes are communicated to balance the high-pressure side and low-pressure side pressures and improve the reverse thrust.
2. The method of reducing TRT thrust shoe temperature of claim 1, wherein: in the step (2), the nitrogen gas seal comprises a high-pressure nitrogen gas seal and a low-pressure nitrogen gas seal, each nitrogen gas seal comprises a fine seal and a coarse seal, the fine seal acts on the carbon ring, the coarse seal acts on the comb teeth, and during adjustment, the fine seals of the high-pressure nitrogen gas seal and the low-pressure nitrogen gas seal are opened.
3. The method of reducing TRT thrust shoe temperature of claim 1, wherein: in the step (3), a high-pressure blow-off pipeline is connected to a low-pressure gas pipe network at the high-pressure side, and a high-pressure blow-off valve is normally opened; at the low pressure side, nitrogen is led to a low pressure sewage pipeline, and a low pressure sewage valve is normally opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111413994.6A CN114215843A (en) | 2021-11-25 | 2021-11-25 | Method for reducing TRT thrust bearing temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111413994.6A CN114215843A (en) | 2021-11-25 | 2021-11-25 | Method for reducing TRT thrust bearing temperature |
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| Publication Number | Publication Date |
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| CN114215843A true CN114215843A (en) | 2022-03-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111413994.6A Withdrawn CN114215843A (en) | 2021-11-25 | 2021-11-25 | Method for reducing TRT thrust bearing temperature |
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| CN (1) | CN114215843A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1419057A (en) * | 2001-11-13 | 2003-05-21 | Ntn株式会社 | Fluid bearing |
| JP2006234147A (en) * | 2005-02-28 | 2006-09-07 | Toshiba Corp | Journal bearing and rotary machine incorporating the journal bearing |
| CN106438680A (en) * | 2016-11-24 | 2017-02-22 | 北京航科发动机控制系统科技有限公司 | High-pressure gear pump bearing with sealing structure |
| CN107084312A (en) * | 2017-04-05 | 2017-08-22 | 哈尔滨汽轮机厂有限责任公司 | A kind of Blast Furnace Gas Turbine nitrogen-sealed system |
-
2021
- 2021-11-25 CN CN202111413994.6A patent/CN114215843A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1419057A (en) * | 2001-11-13 | 2003-05-21 | Ntn株式会社 | Fluid bearing |
| JP2006234147A (en) * | 2005-02-28 | 2006-09-07 | Toshiba Corp | Journal bearing and rotary machine incorporating the journal bearing |
| CN106438680A (en) * | 2016-11-24 | 2017-02-22 | 北京航科发动机控制系统科技有限公司 | High-pressure gear pump bearing with sealing structure |
| CN107084312A (en) * | 2017-04-05 | 2017-08-22 | 哈尔滨汽轮机厂有限责任公司 | A kind of Blast Furnace Gas Turbine nitrogen-sealed system |
Non-Patent Citations (1)
| Title |
|---|
| 郭伟: "高炉煤气余压发电机组（TRT）推力瓦温度高的处理方法", 河北冶金 * |
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Application publication date: 20220322 |
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