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Falling film washing system realizing ultralow emission of coal-fired power plant desulfurated tail gas and technology thereof

A coal-fired power plant, falling film technology, applied to the separation of dispersed particles, chemical instruments and methods, the use of liquid separation agents, etc., can solve the problems of low demisting efficiency, solid particle deposition, complex structure, etc., to improve separation efficiency and The effect of precision

Active Publication Date: 2016-06-22
SHANGHAI ANHORN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Both flat plate and roof demisters adopt blade structure, which has low demist efficiency and low separation precision, and solid particles are easy to deposit on the blades, and there are easy dead angles in the cleaning process, which is inconvenient and difficult to install and disassemble, and the investment is large
At the same time, the application conditions of the wet electrostatic precipitator are relatively harsh, the structure is more complicated, and the power consumption is large. If the existing equipment is modified, it cannot meet the space requirements of the wet electrostatic precipitator.

Method used

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  • Falling film washing system realizing ultralow emission of coal-fired power plant desulfurated tail gas and technology thereof
  • Falling film washing system realizing ultralow emission of coal-fired power plant desulfurated tail gas and technology thereof
  • Falling film washing system realizing ultralow emission of coal-fired power plant desulfurated tail gas and technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Ammonia desulfurization tower for 2X140t / h coal-fired boiler in self-owned power plant, flue gas volume 394252Nm 3 / h, the droplet content of the equipment inlet is 150~200mg / m 3 , dust content 20mg / m 3 , using liquid ammonia as desulfurizer.

[0072] After the original flue gas passes through the absorption section 1, it realizes vapor-liquid contact with the absorbent, and the absorbent falls into the circulating absorption liquid pool 2, and the circulating absorption liquid is raised in the aeration zone 01 through the aeration pipe 02, and the air liquid level is raised. The overflow plate 04 enters the oxidation zone 07, and the oxidized absorption liquid enters the inclined plate settlement zone 05 under the action of the deflector plate 06, and the experimental solid particles are separated rapidly, the absorption liquid overflows into the clear liquid zone 08, and the slurry enters After the absorption liquid mixing area 09 is mixed with fresh slurry, it ente...

Embodiment 2

[0093] Calcium method desulfurization tower for 2X140t / h coal-fired boiler in self-owned power plant, flue gas volume 450000Nm3 / h, droplet content at equipment inlet 150~200mg / m 3 , dust content 30mg / m 3 , using lime slurry as desulfurizer.

[0094] The special plate group demister and the falling film washing section are set on the top of the desulfurization tower.

[0095] After the original flue gas passes through the absorption section 1, it realizes vapor-liquid contact with the absorbent, and the absorbent falls into the circulating absorption liquid pool 2. The flue gas will carry liquid droplets and dust and other substances to rise to the special-shaped tube demister 3, and most of them Part of the liquid droplets and particles with large particle size are captured. The special-shaped pipe has self-cleaning ability, and there is no need to set up a flushing water layer. The flue gas passes through the first-level special plate group demister 6 and the second-level sp...

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PUM

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Abstract

The invention discloses a falling film washing system realizing ultralow emission of coal-fired power plant desulfurated tail gas and a technology thereof. The washing system comprises an absorbing section, an automatic circulation suction liquid bath, a special plate group demister matched with the absorbing section and a falling film washing section matched with the special plate group demister. The washing technology includes the steps that 1, flue gas enters the absorbing section and then makes contact with an absorbent; 2, most liquid drops with the large particle size and smoke dust in the flue gas are removed by the automatic circulation suction liquid bath to obtain new flue gas, then the flue gas is input into the absorbing section again; 3, the flue gas is conveyed to the special plate group demister through the absorbing section, and liquid drops with the diameter being 10 micrometers or above in the flue gas are removed by the special plate group demister; 4, impurities continue to be removed by the falling film washing section. Top space of an existing desulfuration tower and site space are fully used, separation efficiency and accuracy are improved, and the content of particulate matter in the wet desulfurization tail gas is reduced to the ultralow emission level.

Description

technical field [0001] The invention relates to the field of vapor-liquid-solid separation, in particular to a falling film water washing system and a process thereof for realizing ultra-low emission of desulfurization tail gas of a coal-fired power plant. Background technique [0002] At present, the desulfurization device is generally designed to have a droplet content of 75mg / m in the flue gas at the outlet of the demister. 3 , which means that part of the soluble particulate matter in the net flue gas is increased by the wet desulfurization device, which is unavoidable. Not good, it will cause the carried droplet content to be higher than 75mg / m 3 , the concentration of particulate matter in the flue gas will reach 20mg / m 3 Even higher, this concentration has reached 20mg / m in the key areas of the GB13223-2011 standard 3 The smoke and dust emission concentration limit is close to 30mg / m in general areas in the GB13223-2011 standard 3 Smoke and dust emission concentra...

Claims

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Application Information

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IPC IPC(8): B01D47/12
CPCB01D47/12
Inventor 杨积志刘凯李海波
Owner SHANGHAI ANHORN ENVIRONMENTAL TECH CO LTD
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