Electrostatic precipitator EGBM2-40-12-6-4

The electrofilter has electrode systems with elements of a precipitating electrode of a new profile EF-640 (Fig. 1). Elements of the corona electrode of the tape-needle profile are installed on the fields of the electrostatic precipitator. The plate-type precipitation electrodes are assembled from six EF-640 elements suspended from above to the suspension beams, taking into account the possible temperature elongation of the elements; at the bottom, the elements are rigidly fixed to the shaking beam by tightening with bolts with a certain force. The configuration of the profile of the precipitation electrode element provides an optimal level of electric field strength in the interelectrode space. The design features of the EF-640 element give a number of technical advantages in comparison with the use of the former SPS-640 profile in the EGA apparatus: • dynamic acceleration increased by at least 40%, due to the increase in the rigidity of 3 times the profile edges, tight joints of the profile edges with strips of the shaking beam and placement of the elements in the electrode with a clearance of up to 10 mm. This allows to reduce either the impact level or its frequency, thereby increasing the durability of the mechanical system of the precipitation electrode; • the flatness of the precipitation electrode, determined from the deviation of dimensions from the axes, is not less than 2.5 times higher than the flatness of the precipitation electrode assembled from the elements of the SPS-640. In addition, the proposed precipitation elements are delivered to the customer with straightness tolerances that do not require additional editing on the installation. This circumstance made it possible to eliminate editing of the elements during installation and to shorten the installation time by 2-3 times; • the amplitude of low-frequency oscillations of the plane of the precipitation electrode after impact on the shaking beam is not less than 5 times lower. This reduces the consumption of shock energy to low-frequency oscillations, increasing the durability of the electrodes, and also eliminates the violation of the alignment of the electrodes and, as a consequence, the loss of cleaning efficiency; • The calculated life of the precipitation electrode, determined with allowance for the reduction in impact level and low-frequency oscillations, is more than 3 times higher compared to the element of SPS-640; • the profile shape of the EF-640 element simplifies the packing of the elements in the container with the guarantee of maintaining the integrity of the package on the installation site. • The closed edges of the profile of the EF-640 element contribute to reducing the negative effect of secondary ash entrainment when shaking the precipitation electrodes. Elements of precipitating electrodes EF-640 are made on a new modern profiling mill (Fig.2, 3), which has no analogues in the European part of Russia. The capabilities of the mill, built on the basis of the latest scientific and technical achievements, allow the edges of the profile to be made with a bend radius of not more than 3 mm, which creates additional advantages in terms of its rigidity. The designs of electrostatic precipitators with new elements are protected by the RF patents Nos.: 76827; 77181, 77797, which creates priorities in the manufacture and supply of the proposed apparatus. The applied corona electrodes are of a frame structure with coronary elements rigidly fixed in an upright position. The electrodes are mounted on the suspension frame strictly in the center between the planes of the collecting electrodes. Used ribbon-needle corona elements have the following advantages in relation to the other technical solutions used in the reconstruction: - Increased durability in long-term operation. According to the results of bench and industrial tests, an optimal combination of the structural parameters of the element profile and the durability of its attachment to the tubes of the corona electrode frame are achieved. The design and manufacturing technology of the proposed elements significantly reduces the likelihood of their destruction or damage during long-term operation (15-20 years); - the use of fixed points to ensure an effective and stable corona discharge. Experience in the use of spiral wound corona elements showed that they are not only inferior in efficiency to needle structures, but also extremely unreliable due to a reduction in stretch during operation and subsequent formation of unsealing deposits, as well as electrical erosion at the attachment points to the frames. Requires replacement of spirals in about 3-6 years; - the arrangement of fixed corona points along the central axis of the element provides an equal distance to the protrusions of the profile of the deposition element and, accordingly, the maximum uniform level of tension in the precipitating element. The use of Z-shaped corona elements in which the needles are located at the edges of the corona plate cause unevenness of the electric field due to different distances to the protrusions of the deposition elements and, consequently, to a loss of cleaning efficiency; The design of the electrostatic precipitator with the use of long-life ribbon-needle elements of the corona electrodes is protected by the RF patent No. 84742, which creates priorities for the manufacture and delivery of devices with these elements. Shaking of the collecting electrodes - hammer, bottom. It consists of a shaft with falling hammers and a drive. Hammers are located on the shaft at some angle to each other (spirally), and the drive is located outside the body, on its side wall. Shaking of the corona electrodes - hammer, with the location of the drive on the roof of the shell, and the shaft with hammers - in the inter-field gap. The shaking mechanism of the corona electrode is configured to adjust the height of the hammer drop. This allows you to expose the optimal impact modes in the fields, which significantly increases the durability of the corona electrodes and, consequently, the apparatus as a whole. At the same time, simultaneous lifting and resetting of all hammers is carried out by means of a tripping mechanism associated with a particular drive. At the present time, drives (Fig. 4 and Fig. 5) have been developed for the precipitating and corona electrodes on the basis of the cylinder-worm gear motor (Fig. 6). The proposed drive has an output shaft rotation speed of about 0.2 rpm. This speed, based on the results of long-term observations, ensures the normal operation of both the hammer shaking device and the dust-loading devices in the operation of electrostatic precipitators in various industries. The design of the electrostatic precipitator with the developed drive is protected by the RF patent No. 86893. The geared motor is more than 3 times lighter and can be located on the shaft of the shaking mechanism in at least 3 positions: vertical, right and left. This allows you to implement various layout solutions. The proposed actuators do not require maintenance, as the gears are filled with oil in accordance with the minimum air temperature and no oil change is required during the entire service life. The design of the insulator cap with slotted holes, closed by removable plates, is developed. For periodic cleaning of the inner surface of the support and bushing insulators, the plates are displaced on their caps and a rubbed surface is cleaned through the slit-like hole outside the working core of the electrostatic precipitator, which greatly simplifies the maintenance. The design of the electrostatic precipitator with a new insulator cap is protected by the RF patent No. 75962. To prevent the formation of arches of dust in the bunkers, installation of mechanisms for vibration damping of dust is provided.