Wear resistant processing method for surface of long service life and energy-conserving centrifugal type draught fan impeller
A centrifugal and induced draft fan technology, applied in the direction of induced draft, combustion method, mechanical equipment, etc., can solve the problem that the wear resistance and reliability cannot meet the long-life work of the induced draft fan, and increase the technical difficulty and risk of the method of pasting wear-resistant ceramic plates , Adhesive performance and bonding process requirements are very high, to achieve the effect of easy control of process parameters, improvement of equipment safety and reliability, and low cost
Inactive Publication Date: 2010-09-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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Problems solved by technology
The method of covering the wear-resistant guard plate will increase the weight of the impeller and increase the power consumption; because the hardness of the wear-resistant guard plate material is generally in the range of 35-55HRC, its wear resistance and reliability are far from meeting the requirements of the long-life work of the induced draft fan
Since the induced draft fan is a high-speed rotating machine, if the method of pasting wear-resistant ceramic plates is used, how to prevent the ceramic sheets from falling off is the primary problem in this method, so the performance of the adhesive and the bonding process are very high; and for the cement plant. The maximum operating temperature of the induced draft fan working at a relatively high temperature is 500°C, which significantly increases the technical difficulty and risk of the method of pasting wear-resistant ceramic plates
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[0020] The selected model is Y4-2×73-1No.25F-T cement factory kiln head induced draft fan, its structure is double suction, single outlet, double support, and the speed is 760rpm. According to the geometry and material parameters of the induced draft fan, select the structural components (including blades, impeller rear disc) and front disc (without anti-wear treatment) that need anti-wear treatment before welding and assembling the impeller of the induced draft fan. The specific implementation steps are as follows :
[0021] 1. The mass fraction of the composite powder in the special powder core wire is: molybdenum powder (+300~-200 mesh): 7%, titanium diboride powder (+300~-200 mesh: 5%), niobium carbide powder (+ 300~-200 mesh): 12%, titanium powder (+150~-100 mesh): 45%, graphite carbon powder (+300~-200 mesh): 11.5%, chromium powder (+300~-200 mesh): Residue. The purity of the above powders is 99.5%. Prepare the composite powder according to the above-mentioned powder ma...
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Abstract
Disclosed is a surface abrasion resistant processing method for long service life and energy saving centrifugal type draft fan impeller, belonging to the technical field of impeller surface abrasion resistant and energy conservation. The abrasion resistant components such as blade, impeller rear disk and the like needed for welding assembly of the centrifugal type draft fan impeller are selected according to the design parameters of the conventional centrifugal type draft fan, the abrasion areas of the impeller and the impeller rear disk adopts special powder cored wire to directly prepare high abrasion resistant cermet cladding layer; the method for preparing the cermet cladding layer adopts the methods of handhold argon arc welding gun or plasma arc welding gun, hand-operated special powder cored wire feeding, and single channel and overlap cladding; and the abrasion parts comprise the blade front surface, the abrasion area of the inlet end surface of the blade, the welding area of the rear disk and the blade front surface, and the abrasion area of the rear disk. The invention has the advantages that the service life of the impeller can reach to six to ten times of the service life of conventional abrasion treatment, the weight of the impeller is reduced to 80-90% of original weight; the process is very simple, the process parameter is easy to control, and the cost is low.
Description
technical field [0001] The invention belongs to the field of impeller surface wear-resistant technology and energy-saving technology, and in particular provides a surface wear-resistant treatment method for high wear-resistant, energy-saving centrifugal induced draft fan impellers used in cement plants and thermal power plants. Background technique [0002] The induced draft fan is one of the important equipment in the production process of cement plant and thermal power plant, and it is also one of the equipment that consumes the most electricity. In the cement industry, electricity costs have become the third largest expense after raw material costs and labor costs. The working temperature of the induced draft fan commonly used in the kiln head of the cement plant is 380-500 ° C, and the dust concentration in the gas (standard condition) is 60-80 g / m 3 , The induced draft fan speed is 760-980r / min, the induced draft fan wears very seriously, and its maintenance cycle is u...
Claims
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IPC IPC(8): F04D29/30F23L17/00B23K9/04B23K10/02B23K35/22
Inventor 刘宗德何险峰
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)