Distributed control type steam-light discharge process for desulfurizing fume by semi-wet method

A streamer discharge and distributed control technology, applied in separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of low pulse repetition rate, short life, low efficiency, etc., and achieve continuous and stable process and low audio noise , The effect of high power supply

Inactive Publication Date: 2004-07-07
GUANGDONG J TECH ENVIRONMENT SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most pulse power supplies use thyratrons or spark gap switches. Thyratrons have relatively high power, but their lifespan is short, and spark gaps have low power and high noise.
The pulse repetition rate of both is low, less than 1000 times per second, generally in the audio frequency range of about 200Hz, and the noise pollution is serious. At present, neither of them can realize industrial application
Most of the existing reactors are dry-type, and the reactor generally follows the structure and shape of the electrostatic precipitator. It has not realized the optimization of the time-space distribution of the streamer discharge, and has not exerted the efficiency of activating the heterogeneous reaction. Therefore, this kind of reactor has a large volume and high efficiency Low, the reaction product is difficult to collect due to cohesion, and a continuous and stable process cannot be formed, and the investment cost and operating cost of the system equipment are high

Method used

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  • Distributed control type steam-light discharge process for desulfurizing fume by semi-wet method
  • Distributed control type steam-light discharge process for desulfurizing fume by semi-wet method
  • Distributed control type steam-light discharge process for desulfurizing fume by semi-wet method

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Experimental program
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Effect test

specific Embodiment approach 2

[0023] use as figure 1 The semi-wet process of flue gas desulfurization with centralized and distributed control streamer discharge as shown, treats 180,000m 3 / h The flue gas 1 from the coal-fired boiler enters 45m through the flue 2 , 4 electric field electrostatic precipitator 2, the dust concentration of the flue gas after dust removal is 80mg / m 3 , the temperature is 130°C, it enters the dryer 4 through the heat exchanger 3, and after being discharged from 4, the temperature of the flue gas drops to 75°C. The injection device 7 sprays ammonia into the flue gas, and then enters the horizontal wet discharge reactor 8. The wet reactor 8 is composed of 14 units. The unit is a rectangular box with a width of 0.5m; a height of 6.5m; a length of 2m. The ground electrode is covered with 5 mm thick cordierite lining, and the specific surface area of ​​cordierite is 50cm 2 / g, the total volume of the wet reactor is 90m 3, the residence time of the flue gas is 2 seconds, the len...

specific Embodiment approach 3

[0024] use as figure 1 The semi-wet process of flue gas desulfurization with centralized and distributed control streamer discharge is shown, with a treatment area of ​​3000m 3 / h The flue gas 1 discharged from the coal-fired boiler enters the multi-tube dust collector 2 through the flue, and the dust concentration of the flue gas after dust removal is 95mg / m 3 , the temperature is 125°C, the flue gas temperature is reduced to 65°C after passing through the dryer 4 through the heat exchanger 3, and the efficiency of the dryer 4 is 95%. 2 The NOx content is 1000ppm, and the NOx content is 100ppm. Before entering the vertical wet discharge reactor 8, water is sprayed into the flue gas by the water injection device 6 to further humidify and cool the flue gas, and the absorbent adding device 7 sprays water into the flue gas. NaOH aqueous solution, triggers thermochemical reaction. The vertical wet discharge reactor 8 is composed of 28 units connected in parallel. The unit is a c...

specific Embodiment approach 4

[0025] The technological process is the same as that of the specific embodiment 3, and 12000m is processed 3 / h The flue gas discharged from the coal-fired boiler 1, the dust concentration of the flue gas after dust removal is 90mg / m 3 , the temperature is 130°C, after the heat exchanger 3 enters the dryer 4 (its efficiency is 85%), the flue gas temperature drops to 75°C, sprays water into the flue gas through the water injection device 6, and then passes through the absorbent injection device 7 Ammonia spraying enters the vertical wet discharge reactor 8, which is composed of 28 units, the unit is a circular standpipe with a diameter of 200mm, its length is 2m, and the residence time of flue gas is 2 seconds. The inner surface of the ground electrode is covered with 10mm thick cordierite lining, and the discharge electrode has 28 rice-shaped zigzag lines. The repetition rate of the power supply 11 is 70kHz, and the rest of the technical indicators are the same as those in th...

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Abstract

A distributed control type stream-light discharge process for desulfurizing fume is disclosed. Its wet discharge reactor is composed of thermal chemical reaction region and discharge plasma chemical reaction region with discharging electrode and receiving electrode. Said discharging electrode is connected with high-voltage power supply to generate stream-light discharge. Said power supply is controlled in distributed mode. After boiler fume goes through thermal chemical reaction and discharge plasma chemical reaction, the gas pollutant is removed and the liquid by-product is generated and dried to obtain dry powder. Its advantages are high power and long service life of power supply, low noise, and low cost.

Description

Technical field: [0001] The invention relates to a method for gaseous pollutants in flue gas, in particular to a semi-wet method for removing gaseous pollutants by means of streamer discharge to generate non-thermal plasma. Background technique: [0002] As we all know, the key equipment for removing gas pollutants by streamer discharge is pulse power supply and reactor. At present, most pulse power supplies use thyratrons or spark gap switches. Thyratrons have relatively high power, but their lifespan is short, and spark gaps have low power and high noise. The pulse repetition rates of both are low, below 1000 times per second, generally in the audio frequency range of around 200Hz, and the noise pollution is serious. At present, neither of them can realize industrial application. Most of the existing reactors are dry-type, and the reactor generally follows the structure and shape of the electrostatic precipitator. It has not realized the optimization of the time-space dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/74B01D53/80
Inventor 张鸿迪李瑞年徐光冯肇霖王毅姜学东汪至中尉继英
Owner GUANGDONG J TECH ENVIRONMENT SCI CO LTD
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