CN212327853U

CN212327853U - Tar purification device in flue gas of carbon electrode roaster

Info

Publication number: CN212327853U
Application number: CN202020846819.0U
Authority: CN
Inventors: 王强; 李群; 高雪; 曹晓晴; 郑凯; 吴珊; 苏继新
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2020-05-20
Filing date: 2020-05-20
Publication date: 2021-01-12
Anticipated expiration: 2030-05-20

Abstract

The utility model relates to a device for purifying tar in the flue gas of a carbon electrode roasting furnace. The discharge port of the bag filter is connected to the coke powder storage barrel to realize the recycling of the coke powder. The petroleum coke powder is stored in the coke powder storage barrel. The air volume of the roasting flue gas is adjusted by the induced draft fan. The roasting flue gas enters the Venturi mixer at a certain flow rate. At the same time, the Venturi mixer inhales the petroleum coke powder. Mix well. Finally, it enters the bag filter for dust removal to obtain the adsorption saturated petroleum coke powder that adsorbs tar or VOCs. The purified flue gas after dedusting is discharged by the bag filter. The device uses petroleum coke powder as an adsorbent to purify the tar in the roasting flue gas, and the recovered petroleum coke powder is directly used for calcined coke raw materials or electrode forming raw materials, which is convenient for operation and reduces the cost of detar or VOCs.

Description

Device for purifying tar in flue gas of carbon electrode roasting furnace

Technical Field

The utility model relates to a device for purifying roasting furnace flue gas belongs to waste gas treatment technical field.

Background

Carbon electrode processing for electrolytic aluminum or steel making is an important electrode processing process, wherein flue gas of a roasting furnace is paid much attention because the coking process after electrode bonding forming releases thermal cracking tar and VOCs, benzopyrene, sulfur dioxide and other atmospheric pollutants in the tar.

In the prior art of flue gas purification of roasting furnaces, pollutants such as asphalt smoke and the like in flue gas are removed by using electric extinguishing tar, for example, CN209138320U discloses "an ultra-clean emission and purification equipment for flue gas of carbon roasting furnaces", which comprises a tempering evaporation tower, an electric tar precipitator, an induced draft fan, an ozone denitration device, a desulfurization, denitrification and defluorination tower, a wet electric demister and a de-whitening device which are sequentially connected through pipelines; the conditioning evaporation tower is connected with a smoke outlet of the roasting furnace through a smoke inlet pipe; the white removing device is connected with a discharge chimney. However, in the actual operation process of the electrostatic oil trapping device, the efficiency of the electric tar trapping device is limited, and the chimney emission after flue gas desulfurization often has a blue smoke plume phenomenon.

The method also adopts a heat accumulating type combustion mode to thoroughly remove the asphalt smoke and the VOCs, for example, CN108036665A discloses a carbon roasting furnace smoke pollutant heat accumulating type incinerator and a treatment method thereof, which comprises a combustion chamber, a heat accumulating chamber, a reversing system, a reverse combustion system and a purging system; two groups of heat storage chambers are arranged, each group of heat storage chambers comprises more than three heat storage chambers, and the two groups of heat storage chambers are symmetrically arranged at two sides of the incinerator; the regenerators are directly communicated with the combustion chambers, the two groups of regenerators are communicated through a reversing system, and the regenerators are communicated with an exhaust pipeline through a back combustion system. The method adopts heat accumulation type incineration, but is influenced by tar content and heat value, generally needs to supplement fuel, has higher operation cost, and also generates tar deposition carbon deposition on a heat accumulator when the tar content is high, thereby influencing the stable operation of the device.

CN104864709A discloses a car-type carbon roasting furnace system heated by asphalt flue gas, which uses "asphalt flue gas generated in roasting process" as heat source to heat carbon products in the car-type carbon roasting furnace. However, it is difficult to stably operate the fuel due to the limitation of tar content and calorific value of combustion.

CN101310831 discloses a "carbon roasting smoke dust dry purification method and apparatus", wherein a suction force of an induced draft fan is used to make smoke dust enter a dry bottom type cooler for cooling, alumina is used as an adsorbent in a reactor to adsorb harmful substances such as fluorine, tar and the like in the smoke dust, a gas and mixed solid separation and filtration process is performed in a bag-type dust remover, the separated and filtered gas is discharged from a chimney through the induced draft fan, the separated and filtered alumina is recycled, and the rest alumina containing the adsorbent is collected and enters a collection bin to be used as an electrolytic aluminum raw material for later use. The method adopts an alumina adsorption method, but the regeneration and the use of alumina are limited by the production limit of electrolytic aluminum.

SUMMERY OF THE UTILITY MODEL

The utility model provides a carbon electrode bakes burning furnace flue gas tar purifier over a slow fire to carbon electrode flue gas purification processing technique existence not enough, the utility model provides a simple structure, low in processing cost's carbon electrode bakes burning furnace flue gas over a slow fire.

The utility model discloses tar purifier in carbon electrode roasting furnace flue gas adopts following technical scheme:

the device comprises an induced draft fan, a Venturi mixer, a pipeline mixer and a bag-type dust collector which are sequentially connected through pipelines, wherein a suction inlet of the Venturi mixer is connected with a coke powder storage barrel.

The discharge port of the bag-type dust collector is connected with the coke powder storage barrel, so that the cyclic utilization of the coke powder is realized. The discharge port of the bag-type dust collector is connected with the coke powder storage barrel through a powder feeder, and the coke powder discharged by the bag-type dust collector is fed back to the coke powder storage barrel in a pneumatic conveying mode.

Store petroleum coke powder in the coke powder storage barrel, adjust the amount of wind and the coke powder ratio of calcination flue gas through batcher and draught fan amount of wind, calcination flue gas gets into the venturi mixer with certain velocity of flow, and the venturi mixer inhales petroleum coke powder simultaneously, and both get into the pipe-line mixer intensive mixing after mixing. And finally, entering a bag-type dust collector for dust removal to obtain saturated petroleum coke powder for adsorbing tar or VOCs. The purified flue gas after dust removal is discharged by a bag-type dust remover.

The utility model discloses a tar in the calcination flue gas is purified as the adsorbent to the petroleum coke powder, and the petroleum coke powder after the recovery directly is used for calcining burnt raw materials or electrode shaping raw materials, can save the electricity and pounce on the tar process, saves regeneration and reuse process simultaneously, not only convenient operation but also reduces the cost of taking off tar or VOCs.

Drawings

FIG. 1 is a schematic view of the structure principle of the device for purifying tar in flue gas of a carbon electrode roasting furnace of the present invention.

In the figure: 1. the system comprises a draught fan, 2 parts of a Venturi mixer, 3 parts of a coke powder storage barrel, 4 parts of a pipeline mixer, 5 parts of a bag-type dust remover and 6 parts of a powder feeding machine.

Detailed Description

As shown in figure 1, the utility model discloses a coke tar purifier in carbon electrode bakes burning furnace flue gas over a slow fire, include draught fan 1, venturi mixer 2, line mixer 4 and the sack cleaner 3 that connects gradually through the pipeline, each component is existing equipment, and the fine coke storage bucket 3 is connected to venturi mixer 2's sunction inlet. The discharge port (the discharge port of falling dust) of the bag-type dust collector 3 is connected with the coke powder storage barrel 3 through a powder feeder 6. The powder feeder 6 belongs to pneumatic conveying equipment and belongs to the prior art.

The finer the petroleum coke powder stored in the coke powder storage barrel 3, the better the petroleum coke powder is, the petroleum coke used for carbon electrode processing or calcined petroleum coke is used as an adsorbent for adsorbing tar in the roasting flue gas.

The air quantity of the roasting flue gas is adjusted through the draught fan 1, so that the flue gas reaches a certain flow velocity. The roasting flue gas enters a Venturi mixer 2 at a certain flow velocity, and simultaneously the Venturi mixer 1 sucks petroleum coke powder from a coke powder storage barrel 3. The roasting flue gas and the petroleum coke powder are mixed and then enter a pipeline mixer 4 for full mixing. And finally, entering a bag-type dust collector 5 for dust removal to obtain saturated petroleum coke powder for adsorbing tar or VOCs. The purified flue gas after dust removal is discharged by the bag-type dust remover 5, and meanwhile, part of coke powder discharged by the bag-type dust remover 5 can be conveyed to the coke powder storage barrel 3 through the powder feeder 6 for recycling.

The device has the advantages that the removal rate of tar and VOCs is greater than 90%, and the standard emission of the VOCs in the roasting flue gas can be realized.

Claims

1. The utility model provides a tar purifier in carbon electrode roasting furnace flue gas, characterized by: the coke powder dust collector comprises an induced draft fan, a Venturi mixer, a pipeline mixer and a bag-type dust collector which are sequentially connected through pipelines, wherein a suction inlet of the Venturi mixer is connected with a coke powder storage barrel;

and the discharge port of the bag-type dust collector is connected with the coke powder storage barrel.

2. The apparatus for purifying tar in flue gas of a carbon electrode roasting furnace according to claim 1, wherein: and the discharge port of the bag-type dust collector is connected with the coke powder storage barrel through a powder feeder.