Cyclonic and electrostatic coupling high-efficiency dust and mist removal apparatus and its application

A technology of electrostatic coupling and demisting device, applied in electrostatic separation, external electrostatic separator, electrode structure, etc., can solve the problems of unstable electric field voltage, reduce dust removal efficiency, and dust accumulation in cathode lines, and achieve increased turbulent flow, The effect of improving the removal efficiency and the large area of ​​the dust collecting plate

Active Publication Date: 2015-01-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional wet electrostatic precipitator mainly has the following shortcomings: 1. Most of the electric field structure of the wet electrostatic precipitator still adopts the conventional flat electric field, which is prone to dead angles, which makes the gas distribution uneven, thereby reducing the dust removal efficiency; 2. Dust collection It is difficult to form a uniform water film on the board, and it is easy to form a local dry area on the dust collection board, resulting in local resistance, resulting in the generation of back corona, and the water film is too large or too small may affect the power supply voltage, resulting in unstable electric field voltage , so as to reduce the charging rate and removal efficiency of fine particles or acid mist; 3. Wet electrostatic precipitators generally use anode plates and cathode lines to be arranged staggered and parallel. ;4. The cathode line of the wet electrostatic precipitator is prone to dust accumulation
The above deficiencies have reduced the removal efficiency of wet electrostatic precipitators for pollutants such as fine particles and acid mist, and have also restricted their application.

Method used

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  • Cyclonic and electrostatic coupling high-efficiency dust and mist removal apparatus and its application
  • Cyclonic and electrostatic coupling high-efficiency dust and mist removal apparatus and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Using a hexagonal stainless steel cylinder with a side length of 400mm, press figure 1 The cyclone electrostatic dust and mist removal unit is built as the test device as shown. The amount of flue gas used in the test is 100m 3 / h, flue gas temperature is 90°C, inlet flue gas SO 3 The concentration is 50mg / Nm 3 , soot content 1400mg / Nm 3 . In the case of no voltage applied, the measured SO 3 The removal efficiency is about 35%, and the dust removal efficiency is 40%. Then, the electrostatic voltage was adjusted to 40kV, and the measured SO 3 The removal efficiency is about 60%, and the dust removal efficiency is 70%. It can be seen that the combination of the inward injection plate, the bottom swirl plate and spraying technology can significantly improve the purification degree of flue gas.

Embodiment 2

[0041] For a coal-fired boiler with a coal consumption of 10t / h, the designed flue gas volume is 20000Nm 3 / h, flue gas temperature is 140°C, inlet flue gas SO 3 Concentration up to 100mg / Nm 3 , soot content 4000mg / Nm 3 . The device of the present invention adopts the figure 1 The device shown uses 7 towers with an inner diameter of 2200mm. Sodium-calcium double-alkali flue gas desulfurization process is adopted. The vane elevation angle of the bottom swirl plate is 28°, and the opening ratio is 32%; the elevation angle of the inward jet plate is 32°, and the opening ratio is 36%.

[0042] When the boiler load is 90%, the measured desulfurization efficiency is 96.3% and the dust removal efficiency is greater than 97% (the dust concentration in the outlet flue gas is lower than 50mg / Nm3) when the liquid-gas ratio is 1.8L / m3. The airflow resistance of the whole tower is only about 800Pa.

Embodiment 3

[0044] The same structure as in Example 1 is used to treat the coal-fired flue gas of a 40t / h coal-fired boiler. The flue gas is pre-dusted by a multi-tube dust collector, and desulfurized and further dusted by a magnesium oxide desulfurization process. The amount of flue gas treated is 120000m3 / h, and the concentration of sulfur dioxide is 3500mg / Nm 3 . The diameter of the absorption tower is 3500mm. The results show that when the liquid-gas ratio is 2.2L / m 3 , the desulfurization rate was 97%. No fouling and clogging occurred during the continuous operation of the equipment for 6 months.

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Abstract

The invention relates to a cyclonic and electrostatic coupling high-efficiency dust and mist removal apparatus and its application. The apparatus includes a shell (1), a cyclonic and electrostatic dust and mist removal unit, a discharge electrode fixing plate (8), an ash washing water tube (9) and a high voltage direct current power supply (10), the cyclonic and electrostatic dust and mist removal unit is arranged in the shell (1), the discharge electrode fixing plate (8) is arranged above the cyclonic and electrostatic dust and mist removal unit, the ash washing water tube (9) is arranged above the discharge electrode fixing plate (8), and the high voltage direct current power supply (10) is connected with the cyclonic and electrostatic dust and mist removal unit. Compared with apparatuses in the prior art, the apparatus combining an inward injection plate, a bottom cyclone plate and a spraying technology substantially improves the purifying degree of flue gas.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a cyclone electrostatic coupling high-efficiency dust and mist removal device for flue gas purification and its application. Background technique [0002] In recent years, with the continuous development of the national economy, the problem of environmental pollution has intensified, especially the frequent occurrence of "smog", which has seriously affected the health of residents and the ecological environment. For this reason, the state has raised the smoke and dust emission standards for coal-fired, metallurgical and other industries, which puts forward higher requirements for flue gas purification. [0003] Fine particulate matter and SO in flue gas 3 Pollutants such as acid mist are one of the main causes of "smog". Traditional flue gas purification devices such as bag filters and electrostatic precipitators are still not ideal for removing such pollutants. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C3/04B03C3/41B03C3/78
Inventor 晏乃强瞿赞梅剑徐建芳李梦丹
Owner SHANGHAI JIAO TONG UNIV
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