CN101972702B - Comprehensive dust recycling technology and system for sintering machine head electric precipitation - Google Patents

Abstract

A comprehensive dust recovery process and system for sintering head electrostatic precipitator. The method is to transport the dust in the sintering head electric dust collector to the main dust tank or auxiliary dust tank for storage according to the dust conditions. The main dust tank The dust is transported to the dust batching tank by the pneumatic conveying device for centralized batching together with the environmental dust removal dust. The dust in the auxiliary dust tank is humidified by the dust humidifier and then transported by the car to realize the comprehensive recovery of dust. The treatment system includes a main dust chute, an auxiliary dust chute, and a conveying assembly located under the dust hopper on the electrostatic precipitator of the sintering head and transporting the dust to the main dust chute or the auxiliary dust chute. The discharge end of the main dust chute is equipped with a The pneumatic conveying device that transports the dust to the dust batching trough, and the discharge end of the auxiliary dust trough is equipped with a dust humidifier. The invention has the advantages of simple and compact structure, low cost, simple recycling process, stable production, increased production and reduced consumption, and environmental protection.

Description

Dust comprehensive recovery and treatment process and system for sintering machine head electrostatic precipitator

technical field

The invention mainly relates to the field of dust treatment, in particular to a method and equipment for electric dust removal of a sintering head.

Background technique

Iron and steel metallurgical enterprises will produce a large amount of iron-containing dust during the production process of the sintering head electrostatic precipitator, accounting for 0.5% to 1.0% of the sinter output. If these iron-containing dust are not recycled, they will pollute the environment. These iron-containing dusts have the characteristics of high iron content, small dust particle size and poor water absorption. At the same time, they contain a certain amount of water and metals such as zinc, potassium, and sodium in the early stage of production, and are easy to consolidate into agglomerates.

At present, the traditional sintering head dust recovery process adopts the following methods:

1. The dedusted ash from the machine head is directly sent to the batching trough of the batching room through the belt or scraper conveyor, but the transportation distance is long, the dust is large, and the amount of dust removed from the machine head is small, so continuous batching cannot be formed.

2. The dedusted ash from the machine head is conveyed into the tank through the scraper conveyor and bucket elevator, humidified by the humidifier, and then transported to the raw material yard by car for secondary use. However, because the car transportation is intermittent operation, the humidifier will add water when it is added. Sometimes large and sometimes small, it is easy to produce secondary pollution, and the treatment process is increased, and the cost is high.

3. The dust removal ash from the machine head is added to the batching belt before the first mixing through the belt, but the ash unloading is not a continuous operation, which brings unnecessary fluctuations to the batching, and the harmful substances in the dust cannot be discarded as needed.

4. Set up a set of dust pneumatic conveying device under the ash hopper of the electrostatic precipitator at the machine head, and set up a warehouse pump under each ash hopper, and use compressed air to send the dust into the dust batching bin from a long distance. In the early stage, the dedusting ash contains a certain amount of water, and the humidity is high, which is easy to condense into agglomerates, resulting in blockage of the pneumatic conveying pipe. Every time the sintering machine is shut down for inspection and restarted, the wet ash in the ash hopper must be cleaned before pneumatic conveying, resulting in secondary pollution and waste of labor costs. At the same time, when the dedusting ash contains more metals such as zinc, potassium, and sodium, which are not suitable for recycling, the efflux of the dedusting ash cannot be realized.

It can be seen that although the above-mentioned traditional treatment methods are still in use, there are some problems, and the comprehensive recovery and treatment of dust cannot be realized.

Contents of the invention

The technical problem to be solved by the present invention is that: aiming at the technical problems existing in the prior art, the present invention provides a sintering machine with simple and compact structure, low cost, simple recycling process, stable production, increased production and reduced consumption, and environmental protection. The comprehensive dust recovery and treatment process and system of electrostatic precipitator for machine head.

In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:

A dust comprehensive recycling process for sintering head electrostatic precipitator, characterized in that: the dust in the sintering head electrostatic precipitator is transported to the main dust tank or auxiliary dust tank for storage according to the moisture content in the dust; The dust in the main dust tank is transported to the dust batching tank by the pneumatic conveying device for centralized batching together with the environmental dust removal dust. The dust in the auxiliary dust tank is humidified by the dust humidifier and then transported by the car to realize the comprehensive recovery of dust.

As a further improvement of the present invention:

When the moisture content in the dust accounts for less than or equal to 0.5-2% of the total mass, the dust is transported to the main dust tank; when the moisture content in the dust accounts for more than 2% of the total mass, the dust is transported to the auxiliary dust tank.

When the finished sinter is detected to have a zinc content greater than or equal to 0.03% or a potassium, sodium and alkali metal content greater than or equal to 0.10% before entering the blast furnace, the dust will be transported to the auxiliary dust tank and then discharged.

The present invention further discloses a comprehensive dust recycling and processing system for sintering head electrostatic precipitator, which is characterized in that it includes a main dust tank, an auxiliary dust tank, and is located under the dust removal ash hopper on the sintering head electrostatic precipitator and transports the dust The conveying assembly to the main dust chute or the auxiliary dust chute, the discharge end of the main dust chute is provided with a pneumatic conveying device for conveying the dust to the dust batching chute, and the discharge end of the auxiliary dust chute is provided with a dust humidifier .

The conveying assembly includes a scraper conveyor, a bucket elevator and a material distribution controller used to control the feeding of the main dust chute or the auxiliary dust chute. The feed end of the bucket elevator is located at the discharge end of the scraper conveyor, and the discharge end of the bucket elevator communicates with the feed ports of the main dust chute and the auxiliary dust chute through the feed pipe and the distribution controller. .

The material distribution controller is an electro-hydraulic slide valve.

The discharge end of the dust batching tank is sequentially connected with a quantitative feeding device, a second dust humidifier, a batching belt and a primary mixer.

Both the main dust chute and the auxiliary dust chute are equipped with blockage removal components and vibration anti-blocking components.

A dust pulverizer is provided at the outlet of the main dust chute and the auxiliary dust chute.

Compared with the prior art, the present invention has the advantages that: the present invention is used for the dust comprehensive recovery process and system of sintering machine head electrostatic precipitator, realizes the organic combination of dust pneumatic conveying and dust humidification, and its recovery process is simple , saving investment and manpower, clean and energy-saving, not only achieves the purpose of stabilizing production, increasing production, reducing consumption and protecting the environment, but also further plays a dual role of recycling dust from the machine head and benefiting sintering production. economic and social benefits.

Description of drawings

Fig. 1 is a schematic diagram of the structure principle of the present invention.

illustration:

1. Dust removal hopper; 2. Scraper conveyor; 3. Bucket elevator; 4. Distribution controller; 5. Main dust tank; 6. Auxiliary dust tank; Components; 9. Dust pulverizer; 10. Star dust discharge valve; 11. Dust humidifier; 12. Automobile; 13. Pneumatic conveying device; 14. Dust receiving device; 15. Dust batching tank; 16. Quantitative feeding device ; 17, the second dust humidifier; 18, batching belt; 19, a mixer; 20, the second scraper conveyor.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the present invention is used in the dust comprehensive recovery treatment process of sintering head electrostatic precipitator, and the dust in the sintering head electrostatic precipitator is transported to the main dust tank 5 or the auxiliary dust tank 6 for storage according to the dust condition; The dust in the dust tank 5 is transported to the dust batching tank 15 by the pneumatic conveying device 13 to the dust batching tank 15 for centralized batching together with the environmental dust removal dust. 12 outbound to realize the comprehensive recovery and treatment of dust.

Since the process of dust humidification and transportation is in the initial stage of sintering production, the dedusting ash contains a certain amount of water, so it is difficult to convey it by air. When judging and selecting the main dust tank 5 or the auxiliary dust tank 6, when the moisture content in the dust accounts for less than or equal to 0.5-2% of the total mass, the dust is transported to the main dust tank 5; when the moisture content in the dust accounts for When the proportion of the total mass is greater than 2%, the dust is transported to the auxiliary dust tank 6. When the finished sinter is detected to have a zinc content greater than or equal to 0.03% or a potassium, sodium and alkali metal content greater than or equal to 0.10% before entering the blast furnace, it is not suitable for recycling, and the dust is transported to the auxiliary dust tank 6 and then discharged.

The present invention further provides a comprehensive dust recovery and treatment system for sintering head electrostatic precipitator, including main dust tank 5, auxiliary dust tank 6, and dust removal ash hopper 1 located under the upper dust collector of sintering head electrostatic precipitator and transporting the dust to the main dust tank. The conveying assembly of the dust chute 5 or the auxiliary dust chute 6 , the discharge end of the main dust chute 5 is provided with a pneumatic conveying device 13 for conveying the dust to the dust batching chute 15 . The pneumatic conveying method is used to directly press the dust to the dust batching tank 15 in order to realize the long-distance conveying of the dust, the centralized treatment of the dust and the remote automatic control. The discharge end of the auxiliary dust tank 6 is provided with a dust humidifier 11 .

In this embodiment, the conveying assembly includes a scraper conveyor 2, a bucket elevator 3, and a material distribution controller 4 used to control the feeding of the main dust chute 5 or the auxiliary dust chute 6. The scraper conveyor 2 is located Below the bucket 1, the feed end of the bucket elevator 3 is located at the discharge end of the scraper conveyor 2, and the discharge end of the bucket elevator 3 passes through the feed pipe, the distribution controller 4 and the main dust tank 5 and The feeding ports of the auxiliary dust tank 6 are connected. The distribution controller 4 adopts an electro-hydraulic flapper valve. In order to make the feeding more stable and reliable, a second scraper conveyor 20 is added between the distribution controller 4 and the auxiliary dust tank 6 .

In this embodiment, the discharge end of the dust batching tank 15 is sequentially connected with a quantitative feeding device 16, a second dust humidifier 17, a batching belt 18 and a primary mixer 19, and a dust receiving device 14 is installed on the dust batching tank 15. The dosing device 16 and the second dust humidifier 17 are interlocked with the automatic batching system of the whole plant, and the dust is quantitatively fed to the batching belt 18 through automatic control, and enters the primary mixer 19 for mixing, and all the dust is recycled. Concentrated dust batching can effectively solve the system fluctuation caused by the change of ash amount and time, stabilize the composition and moisture of the mixture, stabilize the carbon distribution, improve the air permeability of the material layer, and increase the sintering output and quality. The dust batching tank 15 can be set with different reserves according to the amount of dust to be removed. The dust receiving device 14 is combined with the dust batching tank 15 through the pulse type bag filter to filter dust and the vacuum release valve to release the pressure. The structure is compact and simple, and the dust removal The exhaust effect is more prominent, and the exhaust gas emission concentration of the bag filter is ≤30mg/Nm ³ .

The above-mentioned dust humidifier 11 and the second dust humidifier 17 are both equipped with a humidifying device, and the automatic addition of water can be realized through the humidifying device after the dust is given in a certain amount.

In this embodiment, both the main dust trough 5 and the auxiliary dust trough 6 are equipped with a blockage removal component 7 and a vibration anti-occlusion component 8; in order to prevent the blockage of the conveying pipe during the pneumatic conveying of dust and to make the externally transported dust more fully wet, No secondary pollution is caused. The discharge port of the main dust tank 5 and the auxiliary dust tank 6 is provided with a dust crusher 9 to crush the partially condensed dust, which is more conducive to the pneumatic transportation and dust transportation of dust. Simultaneously, for preventing dust condensation, main dust tank 5 and auxiliary dust tank 6 are all provided with steam insulation or electric insulation.

The above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principle of the present invention should be regarded as the protection scope of the present invention.

Claims (7)

1. A dust comprehensive recycling process for sintering head electrostatic precipitator, characterized in that: the dust in the sintering head electrostatic precipitator is transported to the main dust tank or auxiliary dust tank for storage according to the moisture content in the dust; The dust in the main dust tank is transported to the dust batching tank by the pneumatic conveying device for centralized batching together with the environmental dust removal dust, and the dust in the auxiliary dust tank is humidified by the dust humidifier and then transported by the car to realize the comprehensive recovery of dust Treatment; when the moisture content in the dust accounts for 0.5-2% of the total mass, the dust is transported to the main dust tank; when the moisture content in the dust accounts for more than 2% of the total mass, the dust is transported to the auxiliary dust tank. 2. A comprehensive dust recovery and treatment system for sintering head electrostatic precipitator according to the process of claim 1, characterized in that it includes a main dust tank (5), an auxiliary dust tank (6) and an electric dust collector located at the sintering head The conveying assembly under the dust removal hopper (1) on the dust collector and conveys the dust to the main dust tank (5) or the auxiliary dust tank (6), the discharge end of the main dust tank (5) is provided for conveying the dust To the pneumatic conveying device (13) of the dust batching tank (15), the discharge end of the auxiliary dust tank (6) is provided with a dust humidifier (11). 3. The comprehensive dust recovery and treatment system for sintering head electrostatic precipitator according to claim 2, characterized in that: the conveying assembly includes a scraper conveyor (2), a bucket elevator (3) and a The material distribution controller (4) that controls the feeding of the main dust chute (5) or the auxiliary dust chute (6), the scraper conveyor (2) is located below the dust removal hopper (1), and the hopper lifts The feed end of the bucket elevator (3) is located at the discharge end of the scraper conveyor (2), and the discharge end of the bucket elevator (3) passes through the feed pipe, the distribution controller (4) and the main dust chute. (5) communicate with the feed port of the auxiliary dust tank (6). 4. The comprehensive dust recovery and treatment system for sintering head electrostatic precipitator according to claim 3, characterized in that: the material distribution controller (4) is an electro-hydraulic gate valve. 5. The comprehensive dust recovery and treatment system for sintering head electrostatic precipitator according to claim 2, characterized in that: the discharge end of the dust batching tank (15) is sequentially connected with a quantitative feeding device (16), The second dust humidifier (17), batching belt (18) and primary mixer (19). 6. The comprehensive dust recovery and treatment system for electrostatic precipitator of sintering head according to claim 2, characterized in that: the main dust tank (5) and the auxiliary dust tank (6) are equipped with blockage removal components (7) and vibration anti-occlusion assembly (8). 7. The comprehensive dust recovery and treatment system for sintering head electrostatic precipitator according to claim 2, characterized in that: the discharge ports of the main dust tank (5) and the auxiliary dust tank (6) are equipped with a Dust pulverizer (9).

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