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Method for trapping coal-fired PM2.5 by using agglomeration of attapulgite turbid liquid

A technology of attapulgite clay and suspension, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. Friendliness, reunion Process simple effect

Active Publication Date: 2014-11-19
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] technical problem: The invention provides a method that can solve the problem that the content of fine particles in the flue gas is large and difficult to be captured by subsequent dust removal equipment, so as to realize coal-fired PM 2.5 Emission reduction, reducing air pollution by using attapulgite clay suspension to collect coal-fired PM 2.5 Methods

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  • Method for trapping coal-fired PM2.5 by using agglomeration of attapulgite turbid liquid
  • Method for trapping coal-fired PM2.5 by using agglomeration of attapulgite turbid liquid
  • Method for trapping coal-fired PM2.5 by using agglomeration of attapulgite turbid liquid

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Embodiment Construction

[0030] The present invention will be further elucidated below in conjunction with the accompanying drawings and specific embodiments of the description.

[0031] figure 1 Shown is the agglomeration of attapulgite clay suspension to trap coal-fired PM 2.5 The system diagram of the device is mainly composed of the circulating fluidized bed body, the air supply system, the feeding system, the feeding system, the electric control system, the agglomeration chamber and the spraying system. The fuel used in the experiment is American bituminous coal, and the particle size of the incoming coal is 0.6-1.5mm. During the experiment, the combustion temperature was controlled at 900°C, and the experiment was carried out in an air atmosphere. 1kg / h American bituminous coal was fed into the furnace by a screw feeder, and the air compressor provided primary and secondary air to the furnace to help the fuel burn fully. The unburned coal particles return to the furnace through the cyclone se...

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Abstract

The invention discloses a method for trapping coal-fired PM2.5 by using agglomeration of an attapulgite turbid liquid. The method comprises the steps of grinding attapulgite into particles with diameters smaller than those of a 200-mesh sieve; adding the attapulgite particles into water according to a mass percentage concentration of 0.1-1% to form a turbid liquid; and at the same time, adding a surfactant in the turbid liquid and controlling a pH value of the turbid liquid to 5-7 while stirring the turbid liquid continuously. The turbid liquid is pumped into a flue with a temperature of 110-350 DEG C in front of a deduster according to a volume flow rate of the turbid liquid accounting for 0.01-0.1% of a flue flow volume by a liquid pump; a mass ratio of atomized air to the attapulgite turbid liquid is 0.25-0.5; the turbid liquid is atomized into 20-50 [mu]m fog drops through a two-fluid spray nozzle; the fog drops are mixed with the coal-fired flue gas to make fine particles in the flue gas to grow by agglomeration, thereby facilitating subsequent trapping of a conventional deduster and greatly reducing emission of PM2.5 in the flue gas.

Description

[0001] technical field [0002] The invention relates to a method of collecting coal-fired PM by using attapulgite clay suspension 2.5 The method belongs to the technical field of environmental pollution prevention and clean coal combustion. [0003] Background technique [0004] Combustion of pulverized coal provides us with heat and electricity, but also produces fine particle pollution. The existing dust removal equipment of the power plant has a high capture efficiency for particles with a particle size greater than 2.5 microns that account for a large proportion of the mass, but for a large number of flue gas with a particle size of less than or equal to 2.5 microns (PM 2.5 ) particle capture efficiency is not high, especially for PM 1 The collection efficiency is lower, resulting in a large number of fine particles into the environment. PM emitted by power plants into the atmosphere 2.5 The accumulation of toxic organic pollutants and various trace elements will i...

Claims

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Application Information

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IPC IPC(8): B01D51/04
Inventor 陈惠超吴玮梁财
Owner SOUTHEAST UNIV
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