Method and equipment for treating oil stain and flue dust through flue gas desulfurization system

A desulfurization system and oil pollution technology, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve problems such as inability to solve absorption liquid separation and disposal, inability to handle slurry, etc., to achieve improved purification effect, improved adaptability, and stability quality effect

Active Publication Date: 2013-12-25
JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patented device can only deal with light and fine impurities such as oil stains and a small amount of coal ash. Matters with large particle sizes and specific gravity such as smoke and dust cannot be separated by air flotation normally. The problem of desulfurization system and the problem of separation and disposal of absorption liquid when oil and smoke coexist, and the problem of impurity treatment of slurry with crystalline solids such as limestone gypsum method cannot be dealt with

Method used

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  • Method and equipment for treating oil stain and flue dust through flue gas desulfurization system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0029] Implementation Mode 1—Application when the boiler is fed with oil and ignited:

[0030]When the boiler is fueled and ignited, the boiler burns diesel to raise the temperature of the furnace to a certain temperature and then feeds coal. After the coal burns normally, it stops fueling. During this period, the flue gas contains a large amount of soot, coal powder, and smoke. There is no bypass for desulfurization, and the electrostatic precipitator cannot be used normally when oil is turned on and ignited. The flue gas containing oil and coal powder directly enters the desulfurization absorption tower. At this time, the flue gas has sulfur dioxide and needs to be desulfurized before it can be emptied. In order to ensure the safety of the absorption tower and perform desulfurization, the desulfurization absorption tower must be put into operation.

[0031] During the fuel injection and ignition of the boiler, the desulfurization absorption tower uses the original desulfuri...

Embodiment approach 2

[0033] Implementation Mode 2—Application of short-term failure of boiler dust collector:

[0034] When the dust collector of the boiler fails, the dust removal efficiency drops, the flue gas contains a lot of smoke and dust, the absorption liquid gradually turns gray from clean water, and the smoke and dust enter the absorption liquid. The pump sends the soot-containing absorption liquid in the maintenance pool to the filter for filtration (no need to enter the oil and dust separator). The filtrate is clean absorption liquid and returned to the absorption tower for use, and the filter residue is soot residue.

[0035] Operation effect: After the absorption liquid is polluted by smoke and dust when the dust collector suddenly fails, the entire desulfurization system continues to operate, maintaining normal desulfurization, flue gas discharge up to standard, and no waste water discharge, no secondary pollution. After the quality of the absorption liquid is stable, the absorption...

Embodiment approach 3

[0036] Implementation Mode Three - Application of Boiler Oven:

[0037] When the boiler is baked, the boiler burns heavy oil to raise the temperature of the furnace according to the requirements of the furnace curve. During the furnace, the amount of smoke is small but the smoke is black and contains a lot of oil fume. There is no bypass for desulfurization, and the electrostatic precipitator cannot be used during the oven, and the black oil fume directly enters the desulfurization absorption tower, and the temperature of the flue gas can reach up to 150°C, which exceeds the temperature resistance range of the absorption tower internals. In order to ensure the safety of the absorption tower, add water to the desulfurization absorption tower for circulation, and produce a large amount of black sewage containing oil and tar. After the oven is finished, the sewage in the absorption tower is discharged into the maintenance pool at one time through the circulation pump, and the main...

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Abstract

The invention relates to a method for treating oil stain and flue dust through a flue gas desulfurization system. The method comprises that: 1) raw flue gas containing oil stain and/or flue dust enters an absorption tower, oil stain and flue dust are scrubbed and enter an absorption liquid, and the purified flue gas is discharged from the absorption tower top; 2) the absorption liquid containing the oil stain and the flue dust is discharged into a maintenance pool; 3) the absorption liquid containing the oil stain and the flue dust is conveyed to an oil dust separator through a maintenance pump to carry out oil dust separation, and then is conveyed to a filtration system, wherein the absorption liquid directly enters the filtration system when the absorption liquid only contains the flue dust, and the absorption liquid is firstly conveyed to the oil dust separator when the absorption liquid contains the oil stain; 4) the absorption liquid is subjected to oil stain and flue dust separation in the oil dust separator, wherein the oil stain has a low density so as to float on the surface, the oil stain residue is collected into an oil stain pool through an oil decanter on the oil dust separator, and the flue dust has a high density so as to sink on the bottom of the oil dust separator; and 5) the high flue dust content absorption liquid on the bottom of the oil dust separator is conveyed to the filtration system through a filtration feeding pump, the clear liquid returns to the absorption tower after filtration to be subjected to desulfurization absorption, and the filtration residue is collected in a flue dust residue pool.

Description

technical field [0001] The invention relates to a technology for separating and treating oil pollution and smoke dust in a flue gas desulfurization system, in particular to a technology for wet flue gas desulfurization. Background technique [0002] The desulfurization devices that have been built for coal-fired boilers in my country are basically equipped with flue gas bypasses to ensure the safe and reliable operation of the units and protect the desulfurization devices from damage in the event of an accident. However, with the improvement of national environmental protection standards and monitoring efforts Strengthening, the desulfurization device has gradually closed the bypass, and the newly-built device is generally not allowed to set the flue gas bypass. [0003] After canceling the flue gas bypass, the desulfurization system also becomes the main engine of the power station. To operate synchronously with the boiler, the desulfurization system needs to have the abilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/96B01D47/12B01D53/50
Inventor 徐长香傅国光高瑞华许祥俊
Owner JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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