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Method and device for eliminating white smoke of wet-containing flue gas

A wet flue gas, white smoke technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of poor adjustability, high operation and maintenance costs, large floor space, etc., and achieve the unit consumption of cooling water. Low, good water quality, low power consumption

Pending Publication Date: 2019-01-04
南京圣卡孚科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve this technical goal, there are not many technical options that can be engineered at present, and there are still shortcomings such as large footprint, high operation and maintenance costs, and poor adjustability.

Method used

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  • Method and device for eliminating white smoke of wet-containing flue gas
  • Method and device for eliminating white smoke of wet-containing flue gas
  • Method and device for eliminating white smoke of wet-containing flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Such as figure 1 As shown, the wet flue gas elimination white smoke device of the refinery, the flue gas temperature after desulfurization is 65°C, the dew point is 55°C, and the flow rate is 3.0×10 5 Am 3 / h; after desulfurization, the flue gas enters the spray tower 1, the inner and lower trays in the spray tower 1 are bubble-cap trays, and the inner upper part of the spray tower 1 is provided with a cooling spray device, which is connected with the membrane eliminator 2, The flue gas first passes through the lower bubble tray, the gas flow rate is 3.5m / s, and the spray water volume is 354m 3 / h, the droplet size is 200-500μm, and the flue gas is cooled to 38°C by the cooling spray device.

[0053] After spraying, the flue gas enters the membrane eliminator 2 for liquid suction and demisting. The membrane eliminator 2 is installed outside the spray tower 1. The membrane eliminator 2 is connected in two stages. The membrane eliminator 2 is equipped with a 50nm hydrop...

Embodiment 2

[0055] Such as figure 2 As shown, the flue gas dehumidification production side line experimental device, the simulated flue gas is 1000Am 3 / h Dusty saturated humid air treatment unit, 1000Am 3 The flue gas after desulfurization of / h enters the spray tower 1, the lower tray in the spray tower 1 is a floating valve tray, and the inner upper part of the spray tower 1 is equipped with a cooling spray device, which is connected with the membrane demister 2, and the dust The saturated humid air first passes through the lower valve tray, the gas flow rate is 3m / s, and the spray water volume is 1.4m 3 / h, the droplet size is 400-800μm, after desulfurization at 55℃, the flue gas is cooled to 45℃ by the cooling spray device, and the partial pressure of water vapor is reduced from 15.8kPa to 9.6kPa;

[0056] After spraying, the flue gas enters the membrane demister 2 for liquid suction and demisting. The membrane demister 2 is arranged outside the spray tower 1. The membrane demist...

Embodiment 3

[0058] Such as figure 1 As shown, this embodiment is a 330MW unit of a coal-fired power plant. After desulfurization, the flue gas temperature is 50°C and the flow rate is 1.30×10 6 Am 3 / h, water volume content 11.80%; after desulfurization, the flue gas enters the spray tower 1, the lower tray of the spray tower 1 is a bubble tray, and the upper inner part of the spray tower 1 is equipped with a cooling spray device, and the cooling spray device and the film demist Connected to device 2, the flue gas first passes through the lower bubble-cap tray, the gas flow rate is 2.5m / s, and the spray water volume is 1139m 3 / h, the droplet size is 100-300μm, and the flue gas is cooled to 45°C by the cooling spray device.

[0059] After spraying, the flue gas then enters the membrane eliminator 2 for suction and demisting. The membrane eliminator 2 is set inside the spray tower 1 to become a single device such as image 3 As shown, a buffer baffle is set between the membrane eliminat...

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Abstract

The invention discloses a method and a device for eliminating white smoke of a wet-containing flue gas and belongs to the technical field of gas or steam separation. The method comprises the followingsteps: carrying out cooling spraying on a flue gas after desulfuration, mixing a wet-containing flue gas with cooling mist in a countercurrent manner till the wet-containing flue gas is cooled to a cooling water temperature approximately; carrying out imbibitions demisting on the wet-containing flue gas after cooling spraying, and enabling the flue gas to sufficiently contact the surface of a hydrophilic porous membrane in a membrane demister so as to obtain a low-temperature saturated gas; further heating the low-temperature saturated gas in the step II by using a flue gas heater, and discharging an unsaturated flue gas through a chimney, thereby eliminating white smoke. By adopting the method, the flue gas after desulfuration is fed into a spraying tower, a cooling spraying device is arranged at the upper part inside the spraying tower, and a tower disc is arranged at the lower part of the spraying tower; the cooling spraying device is connected with the membrane demister, the membrane demister is connected with the chimney, and a secondary glue gas heater is arranged between the outlet of the membrane demister and the inlet of the chimney. By adopting the method, a 'white smoke' phenomenon caused when flue gases are discharged can be effectively eliminated, and pollutants such as dust and aerogel can be deeply removed.

Description

technical field [0001] The present application relates to the technical field of gas or vapor separation, in particular to the technical field of eliminating white smoke with wet flue gas. Background technique [0002] Most of the flue gas in the chemical industry, coking, metallurgy, power generation, heating and other fields has adopted wet desulfurization and other treatment technologies that increase the humidity of the flue gas, so that the volume of the flue gas when discharged is about 5-21%, corresponding to the dew point The temperature range is roughly 40-68°C. In addition, the moisture content of natural gas combustion tail gas itself is similar to the above indicators, while the moisture content of the exhaust gas from evaporation, drying and other processes is higher. Some wet flue gas also carries certain dust and aerogels at the same time. These wet and miscellaneous flue gases form an obvious "white smoke" phenomenon when they are discharged. From a techni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/00B01D53/22B01D47/06
CPCB01D47/06B01D53/00B01D53/228B01D2258/0283
Inventor 陆剑鸣李保国程新华陈忠
Owner 南京圣卡孚科技有限公司
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