Circulating gas inlet system for reaction of petroleum coke in calcining furnace

Abstract

The utility model discloses a circulating gas inlet system for petroleum coke reaction in a calcining furnace, and mainly relates to carbon production. Comprising a plurality of air inlet pipelines and a plurality of air inlet pipelines arranged on each air inlet pipeline, and the air inlet pipelines are connected with the furnace body; the multiple air inlet pipelines are connected with one another, the pipe diameters of the multiple air inlet pipelines are different, the air inlet pipeline located at the head end is connected with an air inlet assembly, and the pipe diameters of the multiple air inlet pipelines are gradually reduced. The device has the beneficial effects that the device is used in the petroleum coke reaction in the calcining furnace, the calcining workshop can be improved to overcome the defects of the dust removal equipment, the dust removal equipment can be combined with the calcining furnace, and the exhaust port of the dust removal equipment is combined with the air inlet of the calcining furnace; and meanwhile, the situation that dust is discharged into the atmosphere to pollute the environment due to the fact that dust removal equipment breaks down can be avoided, and the environment friendliness of the dust removal equipment is further improved.

Description

Technical Field

[0001] The utility model relates to the field of carbon production, in particular to a circulating air intake system for petroleum coke reaction in a calcining furnace. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] In the electrolytic aluminum industry, carbon blocks are usually used as anodes. Anode carbon blocks are made of petroleum coke as aggregate and coal tar as binder, and are used as anode materials for pre-baked aluminum electrolytic cells. In the process of producing anode carbon blocks, the raw petroleum coke is first calcined. Calcination is a pretreatment process for carbon production. During the calcination process, petroleum coke will undergo a series of significant changes from elemental composition to organizational structure. Because petroleum coke contains volatiles, it needs to be calcined to remove moisture and volatiles from the raw materials, so that the volume of the carbon raw materials can be fully shrunk and its thermal stability and physical and chemical properties can be improved. During calcination, the molecular structure changes continuously with the discharge of volatiles, and the volume of the raw materials themselves gradually shrinks, thereby increasing the density and mechanical strength of the raw materials and reducing the resistivity of the calcined petroleum coke. If the volatiles of the raw materials are too high, the petroleum coke will shrink too much during the subsequent roasting process, resulting in structural deformation, and ultimately making the anode carbon blocks very easy to break after forming, so it is necessary to discharge the volatiles in the raw materials.

[0004] During calcination, the calcination temperature affects the conductivity of the calcined petroleum coke product. The molecular structure of the petroleum coke is constantly changed through calcination, and the volatile matter is constantly released, making the resistivity of the petroleum coke the lowest. As the calcination temperature increases, the impurities contained in the carbon raw material are gradually eliminated, reducing the chemical activity of the raw material, thereby improving the conductivity of the raw material. The existing post-break petroleum coke production method generally calcines the petroleum coke in a calcining furnace. Most of the existing calcining furnaces control the calcination temperature in the furnace by the oxygen intake at the air inlet. When heating, the air inlet gate on the outside of the calcining furnace body needs to be manually opened to rapidly increase the oxygen intake in the calcining furnace, so that the combustion in the calcining furnace is sufficient.

[0005] However, this method requires that all air inlet gates be opened during the temperature-raising stage of calcining petroleum coke, and the oxygen content in the furnace body be increased by natural wind, which slows down the heating of the furnace body. Therefore, the oxygen content in the furnace body can only be increased by multiple air inlets on each furnace body to achieve the effect of combustion-supporting. However, when calcining petroleum coke, dozens of furnace bodies are generally calcined at the same time. When heating, all the air inlet gates on each furnace body need to be opened. Manual control is labor-intensive and the temperature raising effect is slow. When heating the furnace body, since the air inlet is natural wind, there is a large temperature difference between the natural wind and the inside and outside of the furnace body. The large temperature difference between the inside and outside of the furnace body will cause frequent thermal expansion and contraction of the walls of the calcining furnace body, and eventually cause cracks in the walls outside the calcining furnace, which directly shortens the life of the furnace body and increases the cost investment of the factory. Therefore, it is necessary to improve the air intake system of the calcining furnace body.

[0006] For the calcining workshop of the entire carbon production, there is a pulse bag dust removal equipment in the calcining workshop to filter the dust and other waste gases generated by the crushed calcined petroleum coke. The dust-containing gas enters the dust collector under the gravity of the induced draft fan. The large particles of dust in the gas are filtered under the action of gravity. The fine dust adheres to the outer surface of the bag under the filtering action of the bag. After filtering, the bag is cleaned by a pressurized pulse air cannon, so that the dust in the filter hole of the bag falls off. The purified gas passes through the bag and is directly discharged into the atmosphere through the ventilation duct. This dust removal method has disadvantages. The bags of the pulse bag dust removal equipment need to be replaced regularly. Once the bags are broken or the filtering effect deteriorates, if the smoke is not discovered in time, it will be directly discharged into the atmosphere, affecting the environment in the atmosphere, resulting in an increase in PM2.5 in the environment, which does not meet environmental protection requirements. Because the gas passing through the pulse dust removal equipment is continuously transported by the induced draft fan, it is finally discharged into the atmosphere after dust removal. Utility Model Content

[0007] The purpose of the utility model is to provide a circulating air intake system for petroleum coke reaction in a calcining furnace, which is used in the petroleum coke reaction in the calcining furnace, and can also improve the shortcomings of the dust removal equipment in the calcining workshop, and can also combine the dust removal equipment with the calcining furnace, and combine the dust removal equipment exhaust port with the air intake port of the calcining furnace, increase the air intake of the calcining furnace, and can also avoid dust removal equipment failure, resulting in dust being discharged into the atmosphere to pollute the environment, and further increase the environmental protection of the dust removal equipment. The air intake can be controlled according to the calcination temperature required by the calcining furnace for different purposes, and the calcination conditions of multiple calcining furnaces in the calcining workshop can be met at the same time.

[0008] In order to achieve the above-mentioned purpose, the utility model is implemented through the following technical scheme: it includes multiple air inlet pipelines and multiple air inlet pipelines arranged on each air inlet pipeline, and the air inlet pipelines are connected to the furnace body; the multiple air inlet pipelines are connected to each other, and the diameters of the multiple air inlet pipelines are different, the air inlet pipeline at the head end is connected with an air inlet component, and the diameters of the multiple air inlet pipelines are gradually reduced.

[0009] Each of the air inlet pipelines is provided with an emergency pipeline, and an emergency cover is eccentrically provided on the emergency pipeline. When the air inlet pipeline is under negative pressure, the emergency cover can be automatically opened.

[0010] One end of the emergency cover is fixedly connected to the pipe mouth of the emergency pipeline, the other end of the emergency cover is provided with an inner edge, the pipe mouth of the emergency pipeline is provided with a flange, and the inner edge cooperates with the flange.

[0011] The emergency cover is made of rubber.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] It is used in the petroleum coke reaction in the calcining furnace, and can also improve the shortcomings of the dust removal equipment in the calcining workshop. At the same time, it can also combine the dust removal equipment with the calcining furnace, and combine the dust removal equipment exhaust port with the air inlet of the calcining furnace. While increasing the air intake of the calcining furnace, it can also avoid dust removal equipment failure, causing dust to be discharged into the atmosphere to pollute the environment, and further increase the environmental protection of the dust removal equipment. The air intake can be controlled according to the calcination temperature required by the calcining furnace for different purposes, and the calcination conditions of multiple calcining furnaces in the calcining workshop can be met at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Attached Figure 1 This is a view showing the connection between the device of the utility model and the furnace body.

[0015] Attached Figure 2 It is an overall view of the device in the utility model.

[0016] Attached Figure 3 It is an internal view of the emergency pipeline in the utility model.

[0017] Numbers shown in the accompanying drawings:

[0018] 1. Air inlet pipe; 2. Air inlet pipe; 3. Furnace body; 4. Emergency pipe; 5. Emergency cover; 6. Inner edge; 7. Flange; 8. Connecting pipe. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the present application.

[0020] The utility model is a circulating air intake system for petroleum coke reaction in a calcining furnace. As described in the background technology, for the calcining workshop of the entire carbon production, there is a pulse bag dust removal device in the calcining workshop to filter the dust and other waste gases generated by the crushed calcined petroleum coke. The dust-containing gas enters the dust collector under the gravitational force of the induced draft fan. The large particles of dust in the gas are filtered under the action of gravity. The fine dust adheres to the outer surface of the bag under the filtering action of the bag. After filtering, the bag is cleaned by a pressurized pulse air cannon, so that the dust in the filter hole of the bag is peeled off, and the purified gas passes through the bag and is directly discharged into the atmosphere through the ventilation duct. This dust removal method has disadvantages. The bags of the pulse bag dust removal equipment need to be replaced regularly. Once the bags are broken or the filtering effect becomes poor, if the smoke is not discovered in time, it will be directly discharged into the atmosphere, affecting the environment in the atmosphere and causing an increase in PM2.5 in the environment, because the gas passing through the pulse dust removal equipment is continuously transported by the induced draft fan and is finally discharged into the atmosphere after dust removal. Therefore, the gas discharged from the ventilation duct of the pulse bag dust removal equipment is combined with the air inlet of the furnace body 3. The specific structure is as follows:

[0021] The existing ventilation system inside the factory includes an air inlet pipeline 1 and multiple air inlet pipelines 2. A flap valve is provided between the air inlet pipeline 1 and each air inlet pipeline 2. The opening and closing degree of the flap valve is manually adjusted to control the air entering the furnace body 3. Because there are multiple calcining furnaces in each calcining workshop to calcine petroleum coke at the same time, it is necessary to supply oxygen to each calcining furnace at the same time. Therefore, each calcining furnace is provided with an air inlet pipeline 2 connected to the air inlet pipeline 1. When the airflow generated by the induced draft fan of the pulse dust removal equipment enters the air inlet pipeline 1, it enters the furnace body 3 of the calcining furnace through the connecting pipeline 8, which can play a certain role in increasing oxygen. However, there are multiple (28) calcining furnaces in each calcining workshop to calcine petroleum coke at the same time. Because the uses of calcined petroleum coke are different, the reaction temperature when calcining petroleum coke is different, and the heating stage when calcining petroleum coke is different, and the required heating temperature is also different.

[0022] When air is introduced into the furnace body 3 through the air inlet duct, the air volume in the furnace body 3 is controlled by adjusting the size of the flap valve opening. Multiple calcining furnaces in the calcining workshop are calcining at the same time, and it is time-consuming and laborious for workers to control the size of the flap valve opening of the furnace body 3; for the air inlet pipeline 1 as a whole, since the air inlet pipeline 1 is long, the air pressure in the connecting pipelines 8 at both ends of the air inlet pipeline 1 is different, resulting in different air volume in each connecting pipeline 8, and for the calcining workshop as a whole, the calcination temperature required for each use of petroleum coke is also different. Therefore, improvements are made to enable the air volume of the air inlet pipeline 1 to be arranged according to the required air intake volume in each calcining furnace. The overall structure of the air inlet system is as follows:

[0023] The main structure is as shown in the attached figure of the specification Figure 1 and Figure 2 As shown, it includes multiple air inlet pipelines 1 and multiple air inlet pipelines 2 arranged on each air inlet pipeline 1. The air inlet pipeline 2 is connected to the furnace body 3. The multiple air inlet pipelines 1 are connected to each other, and the diameters of the air inlet pipelines 1 are different. The air inlet pipeline 1 at the head end is connected with an air inlet assembly, and the diameters of the multiple air inlet pipelines 1 are gradually reduced. The air inlet assembly is the pulse dust removal equipment mentioned above. The air inlet pipeline 1 is improved as a whole, and the multiple air inlet pipelines 1 are segmented so that the diameters of the air inlet pipelines 1 in each section are different. The size and length of the diameter of each section correspond to the air intake required by the calcining furnace here, so that the air intake in the same air inlet pipeline 1 is reasonably distributed. The diameter of the air inlet pipeline 1 gradually decreases, the pressure of the air inlet pipeline 1 gradually increases, and the fast gas flow rate increases the air intake at the small diameter of the air inlet pipeline 1, so that the air intake of each section of the multiple air inlet pipelines 1 corresponds to the temperature required for calcination in the furnace body 3 here.

[0024] Emergency pipeline 4:

[0025] In order to prevent the pulse bag dust removal equipment from shutting down or the pulse dust removal equipment from insufficient air volume from affecting the overall operation of the calcining furnace, the air inlet pipe 1 is also connected to a booster fan to provide air volume compensation. If an emergency such as a power outage occurs in the workshop, the air inlet equipment cannot operate normally, affecting the temperature in the calcining furnace, so an emergency vent is required for emergency treatment. The following is the specific structure:

[0026] As shown in the attached figure of the instruction manual Figure 3As shown, each section of the air inlet pipeline 1 is provided with a plurality of emergency pipelines 4, and an emergency cover 5 is eccentrically provided on the emergency pipeline 4, the emergency cover 5 is connected to the outer edge of the emergency pipeline 4, one end of the emergency cover 5 is fixedly connected to the pipe mouth of the emergency pipeline 4, and the other end of the emergency cover 5 is provided with an inner edge 6, and the pipe mouth of the emergency pipeline 4 is provided with a flange 7, and the inner edge 6 cooperates with the flange 7, and the material of the emergency cover 5 is rubber. When the air inlet pipeline 1 works normally, the pressure inside the air inlet pipeline 1 is high and greater than the external atmospheric pressure, and the emergency cover 5 is subjected to the pressure outside the emergency pipeline 4. At this time, the inner edge 6 cooperates with the flange 7 to limit the emergency cover 5, so that the emergency cover 5 can keep the air pressure inside the air inlet pipeline 1 stable. When negative pressure appears in the air inlet pipeline 1, the emergency cover 5 at the pipe opening of the emergency pipeline 4 is first subjected to inward pressure due to the effect of atmospheric pressure. Since the emergency cover 5 is eccentrically arranged at the emergency pipe opening, the inner edge 6 of the emergency cover 5 is subjected to force toward the outside of the pipeline, and the inner edge 6 escapes from the outer edge, and then the movable end of the emergency cover 5 enters the emergency pipe opening from the outside of the emergency pipeline 4. Since the emergency cover 5 is made of rubber, the gap between the emergency cover 5 and the emergency pipe opening is ventilated to the calcining furnace, so that the calcining furnace can maintain air intake through natural wind, thereby avoiding the temperature drop in the calcining furnace due to lack of oxygen in the calcining furnace due to emergencies.

[0027] In summary, the device can be used in the petroleum coke reaction in the calcining furnace, and can also improve the shortcomings of the dust removal equipment in the calcining workshop. At the same time, the dust removal equipment can be combined with the calcining furnace, and the exhaust port of the dust removal equipment can be combined with the air inlet of the calcining furnace. While increasing the air intake of the calcining furnace, it can also avoid the failure of the dust removal equipment, which causes the dust to be discharged into the atmosphere to pollute the environment, and further increase the environmental protection of the dust removal equipment. The air intake can be controlled according to the calcination temperature required by the calcining furnace for different purposes, and the calcination conditions of multiple calcining furnaces in the calcining workshop can be met at the same time.

Claims

1. A circulating air intake system for petroleum coke reaction in a calcining furnace, characterized by: It comprises a plurality of air inlet pipelines (1) and a plurality of air inlet pipelines (2) arranged on each of the air inlet pipelines (1), wherein the air inlet pipelines (2) are connected to a furnace body (3), and each of the air inlet pipelines (1) is provided with an emergency pipeline (4); The multiple air inlet pipelines (1) are interconnected, and the diameters of the multiple air inlet pipelines (1) are different. The air inlet pipeline (1) at the head end is connected to an air intake assembly, and the diameters of the multiple air inlet pipelines (1) gradually decrease.

2. The circulating air intake system for petroleum coke reaction in the calcining furnace according to claim 1, characterized in that: An emergency cover (5) is eccentrically provided on the emergency pipeline (4), and when the air inlet pipeline (1) is under negative pressure, the emergency cover (5) can be automatically opened.

3. The circulating air intake system for petroleum coke reaction in the calcining furnace according to claim 2, characterized in that: One end of the emergency cover (5) is fixedly connected to the pipe mouth of the emergency pipeline (4), and the other end of the emergency cover (5) is provided with an inner edge (6). The pipe mouth of the emergency pipeline (4) is provided with a flange (7), and the inner edge (6) cooperates with the flange (7).

4. The circulating air intake system for petroleum coke reaction in the calcining furnace according to claim 3, characterized in that: The emergency cover (5) is made of rubber.

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