Air pulverized-coal adjusting system constructed on basis of intelligent power plant

Abstract

The invention discloses an air pulverized-coal adjusting system constructed on the basis of an intelligent power plant. The air pulverized-coal adjusting system is provided with an air speed control assembly and an anti-blocking device; the air speed control assembly can control a pulverized coal flow speed of the horizontal section of a pulverized coal pipe and enables pulverized coal to be evenly mixed; the air speed control assembly also prevents heavy pulverized coal from being deposited on the horizontal section of the pulverized coal pipe; the anti-blocking device is provided with a static pressure measuring head for monitoring the lower end of the vertical section of the pulverized coal pipe; and once blockage is found, the air speed control assembly does not control the flow speed any more, and the anti-blocking device purges the lower end of the vertical section to dredge blockage. The air speed control assembly controls the speed of the horizontal section of the pulverized coal pipe, pulverized coal deposition of the horizontal section is avoided, the sampling precision at the horizontal section of the pulverized coal pipe is improved, the anti-blocking device can remove blockage of the vertical section of the pulverized coal pipe, and the situation that time and labor are wasted when the pulverized coal pipe is cut for cleaning is avoided; and the combination of the air speed control assembly and the anti-blocking device can ensure that the deviation of the mixing uniformity of air and the pulverized coal, conveyed by each pulverized coal pipe, at the output end of a coal-fired boiler is within a certain range, combustion deflection is avoided, the operation benefit of a unit is improved, and equipment is protected.

Description

technical field [0001] The invention relates to the technical field of pulverized coal conveying equipment for pulverized coal boilers in smart power plants, and in particular to an air powder regulating system based on the construction of smart power plants. Background technique [0002] In the 1970s, power plants entered the era of electrical automation, and the power plants at this time already had the prototype of smart power plants. With the blowout development of computer technology in the 21st century, power plants have also entered the stage of digital power plants. The power plant at this stage already has a certain degree of intelligence. The current power plant has entered the stage of supporting the power plant, and the overall management and control of the power plant is more detailed; and now the demand for electricity has increased sharply, and the fuel cost of thermal power generation has also increased significantly; To improve the efficiency to meet the g...

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Problems solved by technology

The current power plant has entered the stage of supporting the power plant, and the overall management and control of the power plant is more detailed; and now the demand for electricity has increased sharply, and the fuel cost of thermal power generation has also increased significantly; To improve the efficiency to meet the growing demand for electricity and improve the operating conditions of power plants, we can only turn to smart power plants; and to solve this problem, we must first consider the combustion efficiency of thermal power generation; in the process of improving combustion efficiency, there are two important The parameters need to be more carefully controlled, such as the wind speed of the fuel powder delivered to the boiler, the mixing uniformity of the fuel powder and the air; at present, most of the thermal power generation uses coal-fired boilers and coal powder; while coal-fired boilers mostly use The four-corner tangential, W-shaped, and front-to-back walls are opposed to the combustion mode to operate the boiler; the existing technology adjusts the custom in the powder pipe by manually adjusting the shrinkage hole leveling (Chinese Patent Publication No. CN104864404A, the name is the primary air pipe of the boiler powder making system is vertically arranged) Non-powder accumulation fixed shrinkage cavity device, the public date is August 26, 2015); however, several powder pipes come from the same coal mill at the scene, and any adjustment of any powder pipe will affect the wind speed of other powder pipes , so repeated adjustments are required to adjust the wind speed; at the same time, even if the same pulverizer is used to transport pulverized coal, during the transportation process, the heavy pulverized coal will flow downward in the horizontal section, and the pulverized coal will be layered. , affects the sampling accuracy of pulverized coal in the horizontal section, and affects the judgment of the smart power plant with precise control; the heavy pulverized coal in the vertical section will be biased towards the lower end due to the influence of gravity; when the pulverized coal transportation direction is from bottom to top, the heavy coal Coal powder is easy to deposit at the lower elbow; once the coal powder is deposited to a certain extent and causes blockage, it needs to be cut and cleaned; the cleaning efficiency is low and the cost is high; and because the length of the horizontal section and the vertical section on each powder pipe is In the end, the mixing uniformity of the air powder transported by each powder tube at the output end of the coal-fired boiler is relatively large, which is likely to cause combustion deviation, affect the economical operation of the unit, and bury hidden dangers for the safe operation of the equipment

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