Finely-pulverized coal separator for warehouse type pulverizing system of 100-1,500MW coal-fired power plant boiler

Abstract

The invention discloses a finely-pulverized coal separator for a warehouse type pulverizing system of a 100-1,500MW coal-fired power plant boiler. The finely-pulverized coal separator comprises a tangential inlet (1) of the separator, a cylindrical shell (2) of the separator, a lower part cone (3) of the separator, an exhaust pipe (4) and a lower part hopper (5) of the separator, wherein the tangential inlet (1) of the separator is formed in the upper part of the cylindrical shell (2) of the separator; the lower part cone (3) of the separator is arranged at the bottom of the cylindrical shell (2) of the separator; the exhaust pipe (4) is arranged on the top of the cylindrical shell (2) of the separator; the lower part hopper (5) of the separator is arranged at the bottom of the lower part cone (3) of the separator; an inlet of the lower part hopper (5) of the separator is provided with a mixing prevention cone device (6) of the separator; the diameter of an outlet in the bottom of the lower part cone (3) of the separator is not less than the inner diameter of the exhaust pipe (4). The finely-pulverized coal separator solves the problem of powder entrainment in the separator, thus greatly reducing the back-mixing of pulverized coal, being beneficial to the separation of particles, greatly improving the efficiency of the separator and reducing the operation pressure drop.

Description

technical field [0001] The invention relates to a fine powder separator, in particular to a fine powder separator used in a storage type pulverizing system of a 100MW-1500MW coal-fired power plant boiler. Background technique [0002] In coal-fired power plants, the separator is one of the key processing equipment for processing raw coal into coal powder in the pulverization system. It separates the qualified coal powder ground by the coal mill and sends it to the furnace for combustion. Therefore, the performance of the separator in the pulverizing system determines the fineness and particle size distribution of the powder sent to the furnace for combustion, which affects the combustion efficiency of the boiler, the energy consumption of the pulverizing system, NOx emissions and the wear of subsequent system equipment. [0003] At present, due to the unreasonable structural design of the fine powder separator in my country's coal-fired power plant storage pulverization syst...

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Problems solved by technology

[0003] At present, due to the unreasonable structural design of the fine powder separator in my country's coal-fired power plant storage pulverization system, the inlet part of the separator generally enters the separator shell tangentially along the vertical direction at a large angle. At the same time, the exhaust gas of the separator Tubes generally have louvers and blades, which greatly destroy the separation space of the separator

In addition, what is more serious is that the diameter of the exhaust pipe is larger than the diameter Dx of the powder outlet at the bottom of the cone section of the separator shell, which makes the entrainment of the powder very serious, resulting in the separation of fine powder in the storage type pulverizing system of the existing coal-fired power plants in my country. The separation performance of the device is not high, so that the content of pulverized coal in the tertiary air is too high, the energy consumption of the exhaust fan increases, the impeller of the fan wears quickly, the life is short, the unit consumption of pulverization increases, and the collection output of pulverized coal in the pulverized coal bin is small. Fineness of pulverized coal is not good

At the same time, it seriously affects the combustion of the boiler, causing the flame center of the boiler to rise, the amount of desuperheating water to increase, the exhaust gas temperature to rise, and the emission of nitrogen oxides to exceed the standard, which has brought a great impact on the economic benefits of the power plant.

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