Device and method for promoting double-tower double-cycle wet desulfurization system to remove fine particulate matters and sulfur trioxide acid mist

A wet desulfurization and fine particle technology, applied in the field of dust removal, can solve the problems of difficult operation and complicated device, and achieve the effect of promoting removal, simple process and improving removal efficiency.

Inactive Publication Date: 2018-08-24
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its device is complicated and its operation is difficult, so there are still some difficulties in practical application.

Method used

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  • Device and method for promoting double-tower double-cycle wet desulfurization system to remove fine particulate matters and sulfur trioxide acid mist

Examples

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Effect test

Embodiment 1

[0021] like figure 1 As shown, a double-tower double-circulation wet desulfurization device of the present invention promotes the efficient removal of fine particles and sulfuric acid mist in flue gas, mainly including pre-washing tower 1, desulfurization tower 2, flue gas heat exchanger 5, The pre-washing tower circulation pump 6 arranged on the outside of the pre-washing tower 1 and the desulfurization tower circulating pump 7 arranged on the outside of the desulfurization tower 2 are provided with a pre-washing tower liquid storage tank, a pre-washing tower, and a pre-washing tower in sequence from bottom to top. The tower inlet, pre-scrubber spraying device 3, demister and pre-scrubbing tower outlet, and the pre-scrubbing tower liquid tank, pre-scrubbing tower circulation pump 6 and pre-scrubbing tower spraying device 3 are sequentially connected through pipelines to form a pre-washing cycle circuit; the desulfurization tower is provided with a desulfurization tower liquid...

Embodiment 2

[0024] The flue gas is produced by a fully automatic coal-fired boiler with a flue gas volume of 350Nm 3 / h, supplemented by an aerosol generator, SO 3 Add appropriate amount of coal-fired fly ash, SO 3 , water vapor, so that the concentration of fine particles in the coal-fired flue gas is 48.4 mg / Nm 3 , the mass concentration of fine particulate matter is 15.2mg / Nm 3 , the fine particle number concentration is 3.6×10 6 1 / cm, SO 3 The concentration is 60 mg / Nm 3 . The system adopts the device and its removal method described in Example 1. The wet desulfurization tower adopts a spray tower with a tower diameter of 219mm and a tower height of 5250mm, and a high-efficiency demister is installed on the top of the spray tower. The dust-laden flue gas with a temperature of 120°C first enters the pre-washing tower and reacts with the pre-washing liquid at a temperature of 50°C to reduce the temperature of the flue gas to 55°C, increase the humidity to 95%, and the SO in the f...

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Abstract

The invention provides a device and a method for promoting a double-tower double-cycle wet desulfurization system to remove fine particulate matters and sulfur trioxide acid mist. The device mainly consists of a pre-washing tower, a flue gas heat exchanger and a desulfurization tower. The method mainly comprises the following steps: enabling dusty flue gas to first enter the pre-washing tower andthen react with desulfurization washing liquid in the tower for realizing mass and heat transfer so as to reduce the temperature of the flue gas and approach to the super-saturation state; after that,cooling the flue gas at an outlet of the pre-washing tower by means of the flue gas heat exchanger arranged between the two towers, enabling the flue gas to reach a super-saturation state, enabling the PM2.5/SO3 acid mist to be condensed and grow up, and partially removing the PM2.5/SO3 acid mist; after part of the PM2.5/SO3 acid mist is removed by means of the pre-washing tower and the heat exchanger, enabling the PM2.5/SO3 acid mist to enters the desulfurization tower to be in contact with the lower-temperature desulfurization washing liquid so as to enable the flue gas undergo secondary super-saturation, enabling the PM2.5/SO3 acid mist which is not removed to be secondarily condensed and grow up, removing the rest PM2.5/SO3 acid mist by washing with the desulfurization washing liquid,and carrying out interception and capture by means of a dimister of the desulfurization tower.

Description

technical field [0001] The invention relates to a device and method for promoting the removal of fine particles and sulfuric acid mist in a double-tower double-circulation wet desulfurization system, which can deeply remove SO in flue gas 2 , synergistically remove fine particles and SO from flue gas 3 Acid mist belongs to the technical field of dust removal. Background technique [0002] Fine particulate matter (PM 2.5 ) has become the primary pollutant of urban air in my country. PM 2.5 It is one of the factors that lead to major environmental problems such as reduced atmospheric visibility, acid rain and haze weather, and causes serious harm to human health. Fine particulate matter in the atmosphere mainly comes from coal-fired boiler emissions, motor vehicle emissions, biomass combustion emissions and dust emissions, of which coal-fired boiler emissions account for about 35%. Coal combustion flue gas contains a large amount of fine dust (particle size less than 50 μ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/75B01D50/00
CPCB01D53/50B01D53/75B01D53/78B01D2258/0283B01D50/60
Inventor 杨林军张瑞吴昊车广民
Owner SOUTHEAST UNIV
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