Filtering device for material adding system of thermal power plant

Abstract

The invention discloses a filtering device for a material adding system of a thermal power plant. The filtering device comprises a bearing frame and a filtering plate, the filtering plate is arranged in the bearing frame, the two side edges of the filtering plate are connected with the two side edges of the bearing frame in a sliding manner, and the two ends of the filtering plate and the bearing frame are provided with driving assemblies used for driving the filtering plate to do reciprocating motion. The filtering device has the beneficial effects of being simple in structure, low in cost, safe, reliable, long in service life, capable of preventing blockage and capable of reducing the failure rate of the system.

Description

technical field [0001] The invention mainly relates to the material adding technology of a thermal power plant, in particular to a filter device used in a material adding system of a thermal power plant. Background technique [0002] In thermal power plants, many material addition systems are the main components of power plant auxiliary facilities, and play an important role in maintaining the stable, safe and environmentally friendly operation of power plant unit equipment. Among these material addition systems, a common and widely used system is the limestone powder addition system (Note: Limestone powder is the main raw material for circulating fluidized bed boilers to improve combustion in the furnace and control emission standards). There are two shapes of limestone raw materials commonly used in power plants, one is powdered limestone powder, which can be directly transported to the furnace for use, and the other is granular, which needs to be processed by the supporti...

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Problems solved by technology

[0003] According to the survey of several power plants with fluidized bed boilers, it is found that the limestone powder addition system is one of the most prone to failure systems in the boiler auxiliary system. The top valve is stuck, resulting in boiler flue gas emissions that cannot meet environmental protection requirements

The main reason for the blockage of the limestone powder conveying system pipeline is mainly that the limestone powder is compacted when stored in the warehouse, or foreign matter or large particles are entrained in the limestone raw material, and such objects enter the powder conveying system without effective filtration and accumulate in the Elbows and other parts of the pipeline system lead to increased flow resistance, which is prone to blockage over time

Because the circulating fluidized bed boiler is suitable for a wide range of coal types and high efficiency, it will be the most important type of thermal power plant that may be approved by the State Environmental Protection Administration. However, the auxiliary system for adding limestone powder to the circulating fluidized bed boiler is frequently used. Faults occur, which restricts its development to a certain extent

[0004] The frequent failures of the system were analyzed, and it was found that the root cause was that the limestone powder was not sieved or the sieving effect was not good before the material entered the silo pump through the dome valve from the storage silo, so that the hardened limestone blocks or raw materials The large particles of debris entrained in the limestone powder enter the pipeline of limestone powder, resulting in frequent blockage of the pipeline

In the existing design, most power plants usually do not design filter devices at this location, and a small number of power plants are designed with fixed mechanical filter devices, but the filter effect is not good, it is easy to be blocked, and the equipment frequently fails and needs to be shut down for maintenance. , affecting the normal and stable operation of the limestone powder addition system

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