阅读说明：本技术 一种防范油污侵染的烧结余热发电励磁机及方法 (Sintering waste heat power generation exciter and method for preventing oil contamination infection ) 是由 张志刚 张桂林 奚金鹏 吕先平 黄文芳 夏杰 柯海涛 姜胜清 于 2021-07-30 设计创作，主要内容包括：本发明是一种防范油污侵染的烧结余热发电励磁机及方法,包括轴承座,轴承座内装有主轴,主轴一端连接发电机组,另一端连接励磁机组,励磁机组设有外壳,外壳的顶部设有一根进风管,外壳侧面设有出风口,进风管内装有冷却风扇,冷却风扇工作时向外壳内鼓风使得外壳内呈正压环境；本发明从根本上杜绝了油污侵染励磁机组的情况,避免电气绝缘下降带来的危害。(The invention relates to a sintering waste heat power generation exciter capable of preventing oil contamination infection and a method thereof, wherein the exciter comprises a bearing seat, a main shaft is arranged in the bearing seat, one end of the main shaft is connected with a generator set, the other end of the main shaft is connected with an excitation unit, the excitation unit is provided with a shell, the top of the shell is provided with an air inlet pipe, the side surface of the shell is provided with an air outlet, a cooling fan is arranged in the air inlet pipe, and when the cooling fan works, air is blown into the shell to enable the interior of the shell to be in a positive pressure environment; the invention fundamentally avoids the condition that oil stains infect the excitation unit and avoids the harm caused by the reduction of electrical insulation.)

1. The utility model provides a take precautions against sintering waste heat power generation exciter that greasy dirt infects, includes the bearing frame, is equipped with the main shaft in the bearing frame, and generating set is connected to main shaft one end, and excitation unit is connected to the other end, and excitation unit is equipped with shell, characterized by: the top of the shell is provided with an air inlet pipe, the side face of the shell is provided with an air outlet, a cooling fan is arranged in the air inlet pipe, and when the cooling fan works, air is blown into the shell to enable the interior of the shell to be in a positive pressure environment.

2. The exciter of claim 1, which is used for preventing oil pollution infection and used for generating electricity by using waste heat from sintering, and is characterized in that: the height from the air inlet of the air inlet pipe to the top of the shell is larger than 300mm, and the cooling fan is installed at the top of the air inlet pipe.

3. The method for preventing the oil contamination of the sintering waste heat power generation exciter according to claim 1, which is characterized in that: when the machine is stopped for maintenance, the shell is opened and then cleaned by a dry brush, and then dust of the excitation unit is collected by a dust extraction device.

4. A method according to claim 3 for combating oil contamination infestation, which method comprises: and after the generator is stopped, keeping the running time of the cooling fan of the exciter to be more than or equal to 15 minutes, and performing power failure cleaning work after external oil mist is completely settled.

Technical Field

The invention relates to the technical field of sintering waste heat power generation production, in particular to a sintering waste heat power generation exciter and a method for preventing oil contamination infection.

Background

The sintering waste heat power generation system is a secondary energy recovery system for collecting the waste heat of the sintering ore for power generation through a sintering circular cooler. The generator set mainly comprises a generator, an exciter, a bearing seat and other main components. In various protections of the generator, the rotor grounding protection is an indelible ring, when the rotor has a point grounding fault, although the direct damage to the generator itself can not be caused in a short time, when the deterioration is aggravated and the two points grounding occurs, the safety of the generator is seriously threatened, such as: the symmetry of an air gap magnetic field of the generator is damaged, and the unit vibrates violently; the thermal effect of the short circuit current burns the rotor; damage other exciter devices, etc. Therefore, the root cause of one-point grounding of the generator rotor is analyzed, the fault phenomenon is completely eradicated in the operation and maintenance process, and the method is an effective means for guaranteeing the safety of personnel and equipment and improving the recovery efficiency of secondary energy.

In the early 2020, the sintering waste heat power generation system of Eggrash Steel Limited company of BaoWu group occasionally sends out an alarm of 'one point grounding of a generator rotor', and the generator can automatically recover to be normal after a short time; when the machine is stopped for maintenance for the first time, a maintainer adopts an electrified cleaning agent to clean oil stains attached to the rotating rectifier of the exciter, the machine is started after the maintenance is finished, and the waste heat power generation system does not send an alarm of 'one-point grounding of a generator rotor'; after running for two days, reporting 'one point of the generator rotor is grounded' again; and (4) stopping the machine for the second time for maintenance, similarly cleaning by adopting an electrified cleaning agent, and always giving an alarm of 'grounding one point of a generator rotor' after starting the machine.

Through analysis, the reasons for the above problems are found as follows: referring to fig. 3, the generator excitation end bearing is a radial sliding bearing, and due to friction between a large shaft rotating at a high speed and an oil film, the oil film generates local high temperature, so that part of lubricating oil is volatilized into oil gas and escapes to the outside along a shaft gap to be condensed into suspended oil mist when meeting air; the exciter cooling mode is external forced air cooling, air is fed into air inlets on two sides of an exciter shell, heat generated by an exciter unit is discharged through a fan on the top of the shell, negative pressure is formed in the exciter cover relative to external air pressure, and floating dust and oil mist are inevitably sucked into the exciter unit and form oil stain attachments because gaps among the air inlets, the exciter cover and a large shaft are located in an oil mist distribution area, so that electrical insulation is reduced finally; in addition, the maintenance personnel adopt the charged cleaning agent during the shutdown maintenance, and after the cleaning agent is mixed with the oil stain, the cleaning agent enters the deep part of the electric component along the gap under the action of the pressure nozzle, so that the insulation degree of the deep part of the electric component is reduced, and as a result, the cleaning effect is poorer and poorer.

Disclosure of Invention

The invention aims to thoroughly solve the problem that the insulation degree of an exciter unit is reduced due to oil contamination to report faults, and provides a sintering waste heat power generation exciter and a method for preventing oil contamination infection.

The specific scheme of the invention is as follows: the utility model provides a take precautions against sintering waste heat power generation exciter that greasy dirt infects, includes the bearing frame, is equipped with the main shaft in the bearing frame, and generating set is connected to main shaft one end, and the excitation unit is connected to the other end, and the excitation unit is equipped with the shell, and the top of shell is equipped with an air-supply line, and the shell side is equipped with the air outlet, is equipped with cooling fan in the air-supply line, and the cooling fan during operation is the malleation environment in making the shell to the interior blast air of shell.

The height from the air inlet of the air inlet pipe to the top of the shell is more than 300mm, and the cooling fan is arranged on the top of the air inlet pipe.

The invention also provides a method for preventing oil contamination infection, and particularly relates to a method for cleaning the excitation unit by using a dry brush after the shell is opened during shutdown maintenance, and then collecting dust of the excitation unit by using a dust collector.

After the generator is stopped, the running time of the cooling fan of the exciter is kept to be more than or equal to 15 minutes, and the cleaning work is carried out after the external oil mist is completely settled.

The working principle of the invention is as follows: the rotation direction of the cooling fan of the excitation cover is changed, air exhaust is changed into air blast into the excitation unit shell, the original air inlet is changed into an air outlet, positive pressure is formed in the shell relative to the external air pressure, and oil mist is prevented from being sucked in from gaps among the air door, the excitation cover and the large shaft; the air inlet pipe is heightened, the air inlet is lifted to exceed 300mm of the outer shell, so that the air inlet is separated from an oil mist distribution area, and oil mist is prevented from being sucked from the air inlet.

The invention has the following beneficial effects: 1. the condition that oil stains infect the excitation unit is fundamentally avoided, and the damage caused by the reduction of electrical insulation is avoided; 2. the failure outage rate of equipment is reduced, and the recovery efficiency of secondary energy of the generator is effectively improved; 3. the deep maintenance period is prolonged, and the maintenance cost is saved.

Drawings

FIG. 1 is a schematic diagram of the exciter assembly configuration of the present invention;

FIG. 2 is a left side view of FIG. 1;

FIG. 3 is a schematic diagram of a prior art exciter assembly;

in the figure: 1-a generator set, 2-a main shaft, 3-a bearing seat, 4-a shell, 5-an air outlet, 6-an air inlet pipe, 7-a cooling fan and 8-an oil mist distribution area.

Detailed Description

Referring to fig. 1-2, the sintering waste heat power generation exciter for preventing oil contamination infection in the embodiment includes a bearing block 3, a main shaft 2 is installed in the bearing block 3, one end of the main shaft 2 is connected with a generator set 1, the other end of the main shaft is connected with an exciter set, the exciter set is provided with a housing 4, the top of the housing 4 is provided with an air inlet pipe 6, the side surface of the housing 4 is provided with an air outlet 5, a cooling fan 7 is installed in the air inlet pipe 6, and when the cooling fan 7 works, air is blown into the housing 4 to enable the interior of the housing 4 to be in a positive pressure environment.

In this embodiment, the height from the air inlet of the air inlet pipe 6 to the top of the housing 4 is 500mm (according to the actual situation, the height is larger than 300mm, so that the air inlet is higher than the oil mist distribution area 8), and the cooling fan 7 is installed on the top of the air inlet pipe 6.

In the embodiment, when the generator is shut down for maintenance, the cooling fan 7 is kept running for 20 minutes after the generator is shut down, and power failure cleaning work is performed after external oil mist is completely settled; during cleaning, liquid such as an electrified cleaning agent is prevented from being used for cleaning, and the cleaning agent is prevented from extending into the electrical component; firstly, a dry brush is adopted to clean the attached dust, and then a dust collector is used to collect the dust.