Tandem graphitization insulation screening

First, the use of tandem graphitization furnace insulation material

Speaking of screening, it should be said that it is not worth talking about, but in the face of the screening of tandem graphitization furnace, I feel that not everyone does not understand, but everyone did not pay enough attention to this matter, so Come, let's start with the insulation material in series with the graphitization furnace.

Series of graphite furnace insulation materials selection, as far as I know, furnace insulation materials series now using the following categories, carbon black, calcined petroleum coke, anthracite, metallurgical coke. Let's take a look at the use of various materials in a tandem graphitization furnace.

1. Carbon black--In the initial development of tandem graphitization furnace in China, some companies have used it. It should be possible to use it as a non-conductive insulating material for the tandem furnace. However, this material does not have the price advantage. The same carbon black material has a large specific surface area, and the material has a large dispersibility during use, and is not used by the manufacturer in the process of serially connecting the graphitized electrodes.

2. Calcined petroleum coke--calcined petroleum coke is used as a kind of insulation material for the tandem graphite furnace. In principle, there is no problem. The use index for calcined coke is biased towards medium sulfur coke. The sulfur content is about 2%. The disadvantage of using calcined coke is that the coke has a lower powder resistivity, which increases its conductivity when used as a heat retaining material, which is what we have abandoned. Why are manufacturers still using calcined coke, which is from the needs of each factory? If you have other uses of calcined coke, this problem is another matter. However, for whatever reason, if you want to use calcined coke as a thermal insulation material, you have to calculate the economic account. If you use calcined coke, will you increase the electricity consumption of the normal graphitized electrode? If it is not economically economical, it can no longer be used. If the graphatinized coke you sell is expensive, it can be used.

3, anthracite - anthracite as a series of furnace insulation materials to use, this problem is a lot of people's ideas, anthracite used in the use of graphitization furnace insulation materials can be obtained from electric calcined anthracite and as insulation material is not a two-way The good thing is actually not really satisfactory. We all know that the thermal conductivity of anthracite is high, and when it is used as insulation material, it will increase the power consumption of the baking electrode without any reason, and anthracite is used as insulation material. Also, the part that is close to the baking electrode is well graphitized and the part far from the baking electrode is poorly graphitized. If so, you need to re-process the anthracite after the furnace is released, but the inspection is not performed after the furnace is discharged. The amount of anthracite powder after two processings was found to increase. From this, we know that it is still economically appropriate to count the accounts. Here, we are no longer in-depth study, if you go on, you will leave the subject of the article.

4, metallurgical coke particles - the treatment of gold coke particles as the traditional furnace type Acheson graphitization furnace resistivity to use, this is no longer a matter of discussion, and today we are talking about the insulation of tandem graphitization furnace Whether the use of the material is different from the traditional resistance material use. The series furnace uses the insulation material weight on the heat preservation word. We hope to obtain a material with high resistivity and good strength at the same time, and it has no melting phenomenon at high temperature and can be used repeatedly. At this time, our husband said, is it better to use the resistance material used in the Acheson furnace? Therefore, my answer is to consider the cost problem. Even the best coke particles become the graphitized coke after the strength. The rapid decline, so the price issue is still the main problem that cannot be avoided. Use metallurgical coke as insulation material this is a correct choice, now coke coking plant is divided into two, one is common machine coke, the other is a tamping machine coke as the coke strength better tamping machine Some, and there is basically no difference in price, so using the tamping machine is the right choice for us. The particle size control of the coke is about 8-10mm, which not only maintains the gas permeability of the coke, but also allows the coke particles to be used repeatedly.

Note: The above discusses the use of several insulation materials in the factory. The official can see from the text that the technical data of various materials are not listed. This article only serves as a "small trick" for discussion of screening. . Here, when the officials are interested, they can also conduct heavyweight discussions on these topics, so I will not say more.

The above discussion is the selection of the insulation material of the tandem graphitization furnace. In fact, no matter which kind of insulation material is selected, in the end, the material will become weaker at high temperature and the amount of powder will increase. The increase in the amount of these powders will cause unfavorable factors in the recirculation of the coke particles at different levels. After the multiple use of the graphite furnace insulation material, the powder amount will increase to more than 30%, and the pollution will affect the operation of the graphitization workshop. If the amount of powder is increased to 50%, the tandem furnace will cause stringer electricity, fire, fire, and other abnormal accidents during the peak power transmission period due to poor gas permeability of the insulation material. At the same time, dust pollution from the furnace will also occur. The environment around the workshop will be immersed. At this time, we should screen out the dust, continue to use the original coke particles, and increase the amount of coke to reduce the amount of insulation. According to the actual operating experience data, about one ton of electrode consumption of coke powder is about 200 kg. You can verify the data in production practice. As for the cost, it should be calculated according to the price of coke.

Second, the screening system process roadmap

Figure-1 Schematic diagram of the screening system

Why do you specifically discuss this topic that everyone can't look down on? I have conducted many inspections in various graphitization manufacturers, mostly using manual screening or coke granules to replace materials one time after half a year. Production, this method seems simple, in fact, there are many ills, the biggest problem is the environmental pollution of the workshop, of course, the management department knows that if the powder is more than a certain degree of production, it cannot continue. You will need to replace all materials. In fact, I want to say here, if we have a screening system, how much economic efficiency can be different from our original production method.

Third, the screening process analysis

1. The transportation of the heat preservation material of the graphitization furnace and the materials reaching the screening system can no longer be used. It is possible to control the amount of transported material in the sieve component of 2 hours. Screening is mainly based on working hours.

2, after starting screening

In the screening system diagram, the lower part of the dust collector and the bottom of the storage hopper are 1700mm away from the ground, because all the dust particles to be sold must be packed in tons of bags, and the tons of bags and forklifts are just suitable for this height. . Tons of bags can also greatly reduce the pollution of labor and the ground.

Fourth, the general graphitization workshop screening equipment selection and ordering table 1

The above equipment is a matter of choice. The screening system can be made in a variety of different versions. However, only one of the remaining powders is screened out and the remaining clean pellets are recycled. Through the process of graphitization, the coke particles are thought to be reduced by the high-temperature treatment of graphitized coke ash, and the results of the test are just the opposite. The ash content of the coke particles is increased, and the ash content of the dust is also 36%. After several years. The dust-removing powder is run by the user and the high-ash sifted coke is not available to the user. Maybe there is a reason why customers can't find us? I don't comment here.

Figure-2 Screening System View

V. Screening system operation cost analysis The main consumption of the screening system is the calculation of electricity charges. The expenses of other normal maintenance are basically negligible. The work of the screening part is directly carried out in the production process, no matter which method needs to be arranged. The personnel carry out the screening, which will not be detailed here. The following is an operational cost analysis to calculate the electricity bill and the sales of dusting powder. The screening time is calculated by taking 2 hours of sieving material in 2 hours. The power is 48.6kw. The unit price is 0.7 yuan/KWH. The electricity cost per hour is =48.6*0.7=34.02 yuan. Two hours of electricity consumption: 2*34.02=68.04 yuan dusting powder About 50% of the screening material, 5 tons of dusting powder can be obtained in 2 hours. The return of the particle material is no longer calculated. The general powder sales price accounts for about 25% of the cost of purchasing the insulation material. If the price is 800 yuan/ton coke grain, the sales price of the dusting powder should be 800*25%=200 yuan. / ton, the actual situation is that the sales price will change with the market changes. This is calculated by everyone. If there is no demand, the dust removal powder will be worthless. If there is demand, the price may be higher. . In addition, the theme, when the 2 hour sieve component is 5 tons, the dust removal powder can be 5*200=1000 yuan. The dust removal powder is packed in tons of bags, and the cost of the tons of bags should be included. According to the current price, the original ton bag is 50 yuan/bar, the second-hand bag price is 25 yuan/bar, and the baggage powder is 800 kg per bag: then, the actual bag is calculated with 7 tons of bags. Tons of bag costs = 7 * 25 = 175 yuan, so we know that after the screening can get the difference = sales price - electricity - tons of bags = 1000-68.04-175 = 756.96 yuan. From the above formula can be seen, if It is still profitable to count a portion of the labor or to include some of the other expenses. Objective: We have screened the materials to achieve two goals: 1. The first is that the environment is good. Today, the environmental problem is not a false proposition. This is also due to everyone's understanding of environmental protection. Besides, our graphitization production workshop is full of dust and not the image of modern enterprises. 2, can recover a part of the funds, in fact, about 40% of the coke particles will be used to produce powder for screening, 5% of the dust will be dispersed in the atmosphere during the production process, and some part of about 5% of volatile matter will be Volatilize at high temperature, other pellets have to go back to production and continue to use, waiting for the next screening will be collected in the form of dusting powder, which is a cycle of tandem graphitization insulation.

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