RU213691U1 - Roller support for the regeneration system of collecting and corona electrodes in an electrostatic precipitator - Google Patents

Abstract

The utility model relates to roller bearings for the regeneration system of collecting and corona electrodes in an electrostatic precipitator. The roller support of the electrode regeneration system in the electrostatic precipitator contains a housing in which two rotating rollers are installed on the axes, on which the electrode shaking shaft rests, a cover covering the housing, and limiters to reduce the displacement of the electrode shaking shaft during rotation. In this case, the ratio of the diameter of the rollers to the diameter of the shaking shaft of the electrodes is D _roll /D _shaft = 0.9-2.0, and the ratio of the length of the rollers to their diameter is L _roll /D _roll = 0.9-3.0, where D _roll – roller diameter, mm; D _shaft - shaft diameter, mm; L _roll - roller length, mm. The electrode shaking shaft is rotatable at a speed of 0.2-8.0 rpm. The technical result of the claimed utility model is to increase the durability and reliability of operation in an abrasive environment, cyclic loads and high temperatures. 5 ill.

Description

The utility model relates to roller bearings for the regeneration system of collecting and corona electrodes in an electrostatic precipitator. The roller support (bearing) of the electrode regeneration system in the electrostatic precipitator is an assembly designed to support the shaft of the hammer system for shaking the electrodes under conditions of cyclic loading, dusty environments and at high temperatures.

For shaking the collecting and corona electrodes, as well as for gas distribution gratings, in electrostatic precipitators, as a rule, hammer-type shaking systems are used. The shaft with hammers located in a spiral line rests on bearings that must operate for a long time under cyclic loads, in a dusty environment and at ambient temperatures up ^to 350-400 ° C. For various industries, the abrasive properties of the dust captured in the electrostatic precipitator may vary depending on a wide range depending on its physical and chemical properties. The overall reliability and efficiency of the entire ash collecting plant depends on the reliability of the bearings.

A dry bearing design is known (Rehva Guideline Handbook: Electrostatic Precipitators for Industrial Applications, 2005. ISBN 2-9600468-1-1) shown in FIG. 1. These bearings perform well in non-abrasive dust environments such as solids trapping behind soda recovery boilers or lime kilns. However, when abrasive dust is trapped in the electrostatic precipitator, for example, fly ash from Ekibastuz coal, the life of such bearings is significantly reduced.

Also known is another dry-type bearing design for the shaking shaft of an electrostatic filter, taken as the closest analogue. This bearing has two rollers 4a and 4b installed in the housing 6 on the axes 5a and 5b, as well as a wear-resistant ring 3 fixed on the shaking shaft 1 using a split tapered bushing 2 and a clamping nut 9 with a retaining ring 10. The design allows you to quickly change the rollers and axes. (US3958844 A, B03C 3/76, 05/25/1976).

The disadvantages of the design include the absence of a cover, which allows to reduce the abrasive wear of the bearing elements, as well as the absence of limiters to hold the shaking shaft in the design position.

The technical problem to be solved by the claimed utility model is the development of a roller bearing design that makes it possible to eliminate the above disadvantages.

The technical result of the claimed utility model is to increase the reliability of operation in an abrasive environment, cyclic loads and high temperatures.

The technical result is achieved by the fact that the roller support of the electrode regeneration system in the electrostatic precipitator, containing a housing in which two rotating rollers are installed on the axes, on which the electrode shaking shaft rests, according to the utility model, it contains a cover that closes the housing, and limiters to reduce the displacement of the shaking shaft electrodes during rotation, while the ratio of the diameter of the rollers to the diameter of the shaking shaft of the electrodes is D _roll /D _shaft = 0.9-2.0, and the ratio of the length of the rollers to their diameter is L _roll /D _roll = 0.9-3.0 , where D _roll – roller diameter, mm; D _shaft - shaft diameter, mm; L _roll is the length of the roller, mm, and the electrode shaking shaft is rotatable at a speed of 0.2-8.0 rpm.

The difference from the known designs of dry-type bearings operating in difficult conditions is the presence of a closed housing in which at least two rollers are installed on the axles. The shaft for shaking the electrodes rests on the rollers, the design position of which is provided by the limiters. The need to hold the shaking shaft in the design position (without shifting to the rollers in one direction or the other) is determined by the requirement to maintain alignment between the shaking shaft, the insulator shaft and the gear motor shaft. The stops also prevent dust from entering the space above the rollers, reducing their abrasive wear, i.e. improving durability and operational reliability.

The advantages of such a design include:

less wear of the shaft and parts of the roller bearing in conditions of abrasive dust trapping due to the closed housing design, including limiters that prevent dust from entering the area above the rollers, which ensures increased durability and reliability during operation;

lower moment of resistance to rotation, including the beginning of movement, which also leads to an increase in durability and reliability during operation;

keeping the shaking shaft in the design position through the use of limiters, which is also aimed at increasing durability and reliability during operation.

Fig. 1. Prior art electrode regeneration bearing.

Fig. 2. Roller support of the electrode regeneration system in the assembled state.

Fig. 3. Roller support of the electrode regeneration system with the cover removed.

Fig. 4. Roller support of the electrode regeneration system without a side wall.

Fig. Fig. 5. Roller support of the electrode regeneration system with the cover removed (top view).

Shown in FIG. 2-5, the roller support of the electrode regeneration system in the electrostatic precipitator (dry type bearing) contains a housing (1), in which two rotating rollers (3) are installed on the axles (4) with nuts (9), on which the shaft (2) for shaking the electrodes rests .

The roller bearing of the electrostatic precipitator electrode regeneration system also includes a cover (5) covering the housing (1), which provides a closed structure that minimizes internal dust deposition and thus improves the durability and reliability of the shaking system. The cover (5) is fixed on the body (1) by means of a bolt (7) and a nut (8).

In addition, said roller bearing contains limiters (6) to reduce the displacement of the shaft (2) shaking the electrodes during rotation. Due to the presence of limiters (6) inside the housing (1), which reduce the vibrations of the shaft during rotation, the requirement to maintain the alignment of the shaking shaft, the insulator shaft and the motor-reducer shaft is met. The used limiters prevent dust from entering the space above the rollers (3), which reduces their wear.

In this case, the ratio of the diameter of the rollers (3) to the diameter of the shaking shaft (2) should be in the range D _roll /D _shaft = 0.9-2.0 (Fig. 4), which is optimal for the operation of the claimed roller bearing with ensuring durability and reliability and was chosen experimentally taking into account the fact that at a lower ratio of the indicated diameters, i.e. less than 0.9, the resource of the roller bearing will decrease, and at a higher value, i.e. more than 2.0 - its dimensions and cost will increase significantly.

At the same time, in order to reduce the abrasive wear of the shaft and increase the service life of the roller bearing, the ratio of the length of the rollers to their diameter should be in the range L _roll /D _roll = 0.9-3.0 (Fig. 5), which is optimal for the operation of the declared roller bearing to ensure durability and reliability and was chosen experimentally taking into account the fact that a decrease in this ratio below 0.9 will lead to an increase in the load on the shaking shaft and rollers, and, consequently, to a decrease in their resource. In this case, the increase in the mentioned ratio L _roll /D _roll , namely more than 3.0 will lead to an increase in the dimensions and cost of the roller bearing.

These roller bearings are designed to work in an electrostatic precipitator with the rotation of the electrode shaking shaft at a speed of 0.2-8.0 rpm, which is also aimed at increasing the durability and reliability of operation. At lower speeds, less than 0.2 rpm, the shaking systems of modern electrostatic precipitators do not work. When the rotation speed of the shaking shaft is more than 8.0 rpm, intensive wear of the electrostatic precipitator equipment is possible, including electrodes, anvils, bearings, shafts, shaking rails, etc.

To verify the correctness of the selected ratios and ranges, roller bearings were manufactured and tested for 1.5 years with the ratios D _roll /D _roll = 1.2, L _roll /D _roll = 1.6 at a rotation speed of the shaking shaft of 1.0 rpm / min. As a result of monitoring the condition of the roller bearings, significant wear of both the bearings and the shaft of the shaking system was not found.

Thus, the operating experience of roller bearings has shown their high reliability and durability in abrasive environments, cyclic loads and high temperatures.

From the foregoing, it follows that the above essential features complement each other and are in a causal relationship with the claimed technical result, which consists in increasing the durability and reliability of operation in an abrasive environment, cyclic loads and high temperatures.

Claims (1)

Roller support of the electrode regeneration system in the electrostatic precipitator, containing a housing in which two rotating rollers are installed on the axes, on which the electrode shaking shaft rests, characterized in that it contains a cover covering the housing and limiters to reduce the displacement of the electrode shaking shaft during rotation, when In this case, the ratio of the diameter of the rollers to the diameter of the shaking shaft of the electrodes is D _roll /D _shaft = 0.9-2.0, and the ratio of the length of the rollers to their diameter is L _roll /D _roll = 0.9-3.0, where D _roll - roller diameter, mm; D _shaft - shaft diameter, mm; L _roll - roller length, mm, and the electrode shaking shaft is made with the possibility of rotation at a speed of 0.2-8.0 rpm.

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