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A system and method for water-vapor phase change coupled with low-temperature electrostatic precipitator to remove fine particles

A water vapor phase change, low and low temperature technology, applied in the field of flue gas purification, can solve the problems of poor dust removal performance, achieve the effects of strengthening adhesion, reducing jet resistance, and improving removal efficiency

Active Publication Date: 2019-11-08
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of low and low temperature electrostatic precipitator prone to secondary dust and poor dust removal performance in the prior art, the present invention provides a system and method for water vapor phase change coupled with low and low temperature electrostatic precipitator to remove fine particles, combining phase change chamber and The coupling of low and low temperature electrostatic precipitators, on the one hand, can increase the particle size of fine particles before they enter the inlet of the precipitator, and promote the charge removal efficiency of the fine particles by the electrostatic precipitator; on the other hand, due to the presence of water vapor on the particle surface, the The adhesion effect between the fine particles on the dust collection plate can reduce the secondary dust phenomenon when the electrostatic precipitator is vibrating and cleaning the dust, and improve the dust removal performance of the dust collector

Method used

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  • A system and method for water-vapor phase change coupled with low-temperature electrostatic precipitator to remove fine particles
  • A system and method for water-vapor phase change coupled with low-temperature electrostatic precipitator to remove fine particles
  • A system and method for water-vapor phase change coupled with low-temperature electrostatic precipitator to remove fine particles

Examples

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Embodiment 1

[0048] A water vapor phase change coupled low-temperature electrostatic precipitator system for removing fine particles, such as figure 1 As shown, it includes a denitration reactor 2, an air preheater 3, a heat recovery device 4, a low and low temperature electric precipitator 6, a desulfurization tower 7 and a reheater 8 connected in sequence through the flue, and the denitration reactor 2 is connected with the boiler 1, the reheater 8 is connected to the chimney 9, and the phase change chamber that promotes the growth of fine particles in the flue gas is connected between the heat recovery device 4 and the low-temperature electrostatic precipitator 6 5.

[0049] Such as figure 2 As shown, the phase change chamber 5 includes a flue gas inlet 51, a flue gas outlet 52, a condensed water discharge port 55 and several steam inlets 53, and the flue gas inlet 51 and the condensed water discharge port 55 are all arranged on the At the bottom of the phase change chamber 5, the co...

Embodiment 2

[0056] In this embodiment, a system for water vapor phase change coupled with low and low temperature electrostatic precipitator to remove fine particles, the basic structure is the same as that of Embodiment 1, the differences and improvements are as follows: figure 2 As shown, the steam inlet 53 is provided with an atomizing nozzle 54, so that what passes into the phase change chamber 5 can be water vapor or liquid water. When water is passed into the phase change chamber 5 Instead of steam, the atomizing nozzle 54 can atomize water to form water mist to promote the combination of water and particles; use liquid cold water atomization to combine with flue gas to cool the flue gas, and at the same time through heat transfer The mass transfer process makes it easier to reach supersaturated water vapor conditions.

Embodiment 3

[0058] In this embodiment, a system for water vapor phase change coupled with low-temperature electrostatic precipitator to remove fine particles, the basic structure is the same as that of Embodiment 1 or 2, the differences and improvements are as follows: image 3 As shown, the phase change chamber 5 is provided with a swirl device 56 for enhancing the mixing of smoke and water vapor, and the particles and water vapor are fully mixed by generating a swirling air flow. The swirl device 56 is also made of low surface energy materials , to prevent steam from condensing on the surface of the cyclone device 56, causing waste of steam and increasing energy consumption. In this embodiment, the lining material of the cyclone device 56 is polytetrafluoroethylene. Such as image 3 , 4 As shown, the swirl device 56 is in the shape of an inverted funnel, and the steam inlet 53 and the upper port of the swirl device 56 are arranged in a tangential circle, which can reduce the jet resist...

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Abstract

The invention discloses a system and a method for removing fine particles through water vapor phase change coupling low-low temperature electric dedusting and belongs to the technical field of smoke purification. The system comprises a denitration reactor, an air preheater, a heat recycling device, a low-low temperature electric deduster, a desulfurizing tower and a reheater in sequential connection, the denitration reactor is connected with a smoke outgoing flue of a boiler, the reheater is connected with a chimney, a phase change chamber is connected between the heat recycling device and theelectric deduster; the phase change chamber comprises a smoke inlet, a smoke outlet, a condensed water discharging port and a plurality of steam inlets, an atomizing nozzle is arranged on each steaminlet, a cyclone device is arranged in the phase change chamber and is in the shape of an inverted funnel, the steam inlets and the upper port of the cyclone device are in tangential circle arrangement, and the steam inlets are uniformly distributed around central axis of the phase change chamber. The phase change chamber and the low-low temperature electric deduster are coupled, so that charge removing efficiency of the electric deduster to the fine particles can be improved, and dust re-entrainment during rapping dust removal of the electric deduster is reduced.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, in particular to a system and method for removing fine particles by water vapor phase change coupled with low-temperature electric dust removal. Background technique [0002] The flue gas emitted by coal-fired power plants contains a large amount of fine particles, which is one of the main sources of particulate matter pollution in the atmospheric environment, and most of these particles contain toxic substances such as heavy metals. These particles are small in size, large in surface area, carry various heavy metals and have long transmission distances Fine particles can cause great harm to human health. Therefore, efficient removal of fine particles in power plants is required. [0003] The electrostatic precipitator has the advantages of high dust removal efficiency, low equipment resistance, large amount of flue gas treatment, low operating cost, less maintenance workload and n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23J15/00F23J15/02F23J15/06F23J15/08
CPCF23J15/006F23J15/02F23J15/022F23J15/06F23J15/08F23J2215/10F23J2215/20
Inventor 徐俊超孙运兰朱宝忠丁世磊
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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