Flow velocity control device for environment-friendly circulating combustion-supporting system for calcined petroleum coke reaction

Abstract

The utility model discloses a flow velocity control device for an environment-friendly circulating combustion-supporting system for a calcined petroleum coke reaction, and mainly relates to carbon production. Comprising a sleeve arranged on the outer side of the nozzle, a movable shaft arranged in the sleeve, a control piece arranged in the sleeve and a flow blocking piece arranged in the nozzle. The flow blocking piece is attached to the movable shaft, the flow blocking piece is a diaphragm, and the control piece is used for controlling the displacement distance of the movable shaft in the sleeve. The device has the beneficial effects that the device is used for replacing manual work to control the air inlet amount in the furnace body, can be simply controlled according to the oxygen inlet amount required by each stage of petroleum coke calcination in the furnace body, is quick in response, can be controlled at any time, and can be combined with a combustion improver adding process of a petroleum coke calcination system; therefore, the additive amount of the combustion improver is better controlled.

Description

Technical Field

[0001] The utility model relates to the field of carbon production, in particular to a flow rate control device for an environmentally friendly circulating combustion-supporting system for calcining petroleum coke reaction. 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 prebaked 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, a series of significant changes will occur in the elemental composition and organizational structure of petroleum coke. 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 calcination temperature affects the conductivity of the calcined petroleum coke product. Through calcination, the molecular structure of the petroleum coke changes continuously, and the volatiles escape continuously, making the resistivity of the petroleum coke the lowest. As the calcination temperature increases, the impurities contained in the carbon raw materials are gradually removed, reducing the chemical activity of the raw materials, thereby improving the conductivity of the raw materials.

[0004] The existing calcined petroleum coke production method generally calcines 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 gates on the outside of the calcining furnace body need to be manually opened, and air enters the calcining furnace through the air inlet, so that the oxygen intake in the calcining furnace is rapidly increased. However, in this method, during the heating stage of calcining petroleum coke, all the air inlet gates need to be opened, and the oxygen content in the furnace body is increased by natural wind, which makes the heating of the furnace body slow. 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 used for calcination at the same time, and each furnace body has three air inlets. When heating, the air inlet gates on each furnace body need to be fully opened. Manual control is labor-intensive and the temperature increase effect is slow. When the furnace body is heated, 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 calcining furnace body wall, and eventually cause the outer wall of the calcining furnace to crack, which directly shortens the life of the furnace body and increases the cost investment of the factory.

[0005] In order to reduce the impact of multiple air inlets on the furnace body on the furnace body life, the following improvements are made: Figure 1 and Figure 2As shown, an air intake pipeline and a connecting pipeline are provided to ventilate the interior of the furnace body. The air intake pipeline is connected to a pulse dust removal device with an induced draft fan, so that the gas from the pulse dust removal device passes into the furnace body. In order to control the flow rate of the gas entering the furnace body, the existing flow rate control device is a flap valve, which is provided between the air intake pipeline and each connecting pipeline. The opening and closing degree of the flap valve is controlled by manual adjustment, which not only has a large workload but also requires precise control of the air intake volume. Therefore, manual control cannot meet the needs and needs further improvement. Utility Model Content

[0006] The purpose of the utility model is to provide a flow rate control device for an environmentally friendly circulating combustion-supporting system for calcining petroleum coke reactions, which is used to replace manual control of the air intake volume inside a furnace body, and can be controlled according to the oxygen intake volume required for each stage of calcining petroleum coke in the furnace body. It is simple and has a fast response, and can be controlled at any time. It can be combined with the process of adding a combustion-supporting agent to the calcining petroleum coke system, thereby making it possible to better control the amount of combustion-supporting agent added.

[0007] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical solutions:

[0008] A flow rate control device for an environmentally friendly circulating combustion-supporting system for calcining petroleum coke reaction, wherein the flow rate control device is arranged at the nozzle of an ejector assembly, and comprises a sleeve arranged on the outside of the nozzle, a movable shaft arranged inside the sleeve, a control member arranged inside the sleeve, and a flow blocker arranged inside the nozzle; the flow blocker is fitted with the movable shaft, the flow blocker is a diaphragm, and the control member is used to control the displacement distance of the movable shaft inside the sleeve.

[0009] The control member controls the displacement distance of the movable shaft inside the sleeve through magnetic force.

[0010] The control component includes an annular electromagnet arranged on the inner side of the sleeve and a spring matched with the movable shaft; an adsorption plate is arranged above the movable shaft, the adsorption plate is in contact with the diaphragm, and the annular electromagnet adsorbs the adsorption plate of the movable shaft.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] This device is used to replace manual control of the air intake volume inside the furnace body, and can control the oxygen intake volume required for each stage of petroleum coke calcination in the furnace body. It is simple and has a fast response, and can be controlled at any time. It can be combined with the process of adding combustion aids in the calcining petroleum coke system, so as to better control the amount of combustion aid added. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 This is an overall connection view of the pipelines of the calcining furnace body of the utility model.

[0014] Attached Figure 2 It is an overall view of the pipeline in the utility model.

[0015] Attached Figure 3 It is a cross-sectional view of the ejector assembly in the utility model.

[0016] Attached Figure 4 This is an internal view of the ejector pipeline in the utility model.

[0017] Attached Figure 5 It is a cross-sectional view of the ejector assembly in the utility model.

[0018] Numbers shown in the accompanying drawings:

[0019] 1. Nozzle; 2. Sleeve; 3. Movable shaft; 4. Diaphragm; 5. Ring electromagnet; 6. Spring; 7. Adsorption plate; 8. Ejector pipe; 9. Air inlet; 10. Combustion aid adding port; 11. Intake chamber; 12. Gradually contracting section; 13. Diffuser section; 14. Furnace body. DETAILED DESCRIPTION

[0020] 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.

[0021] The utility model is a flow rate control device for an environmentally friendly circulating combustion-supporting system for calcining petroleum coke. The flow rate control device is arranged at the nozzle 1 of the ejector assembly. First, a brief description of the ejector assembly is given. The ejector is based on the Venturi effect. Low pressure will be generated near the high-speed flowing fluid, thereby generating an adsorption effect. Figure 3 and Figure 5 As shown, the ejector assembly includes an ejector pipe 8, a nozzle 1 connected to the air inlet pipe, an air inlet 9 arranged at one end of the ejector pipe 8, and an combustion aid addition port 10 connected to the outer wall of the ejector pipe 8; since the calcination temperature of petroleum coke cannot be met by simply controlling the air intake volume, it is necessary to add a combustion aid, but this is not the main invention point of the present device and will not be described in detail here. A nozzle 1 is provided at the air inlet 9, and a suction chamber 11 is provided between the nozzle 1 and the combustion aid addition port 10, and a tapered section 12 is provided between the suction chamber 11 and the connecting pipe; the connecting pipe and the nozzle 1 are both located in the furnace body, and a pressure diffuser section 13 is provided in the connecting pipe, and the cross-section of the pressure diffuser section 13 is larger than that of the tapered section 12.

[0022] As shown in the attached figure of the instruction manual Figure 3 and Figure 4As shown, air is taken in through a nozzle 1 with a small cross-sectional area, so that the flow rate of the gas is accelerated, thereby reducing the pressure in the suction chamber 11 to be lower than the external atmospheric pressure, so that the combustion aid at the combustion aid adding port 10 is allowed to enter the suction chamber 11 through the atmospheric pressure, and is mixed with the gas entering from the air inlet pipe. After the combustion aid is mixed with the gas, it passes through the tapered section 12 and enters the diffuser section 13 in the connecting pipe, and then directly enters the furnace body from the diffuser section 13. However, if the device still uses a flap valve to control the flow rate of the air inlet pipe, firstly, the device has a low accuracy in controlling the amount of combustion aid added, and cannot accurately determine the amount of combustion aid added. In addition, it is troublesome to control the flow rate of the air inlet pipe through a flap valve, and it is necessary to manually adjust the opening and closing size of the flap valve according to the calcination time period, and the opening and closing is completely controlled by experience, so the flow rate control device also needs to be improved:

[0023] As shown in the attached figure of the instruction manual Figure 3 and Figure 4 As shown, a flow rate control device is provided in the nozzle 1, and the flow rate control device includes a sleeve 2 arranged outside the nozzle 1, a movable shaft 3 arranged inside the sleeve 2, a control member arranged inside the sleeve 2, and a flow blocking member arranged inside the nozzle 1;

[0024] The flow-blocking member is a diaphragm 4, which is fitted with the movable shaft 3. The control member controls the displacement distance of the movable shaft 3 inside the sleeve 2 through magnetic force, thereby controlling the change of the cross-sectional size of the jet assembly by the movable shaft 3, thereby controlling the flow rate of the jet assembly. The control member includes an annular electromagnet 5 arranged inside the sleeve 2 and a spring 6 matched with the movable shaft 3; an adsorption plate 7 is arranged above the movable shaft 3, the adsorption plate 7 is fitted with the diaphragm 4, and the adsorption plate 7 and the diaphragm 4 are lifted up together by the elastic force of the spring 6.

[0025] An annular electromagnet 5 is provided inside the sleeve 2. The annular electromagnet 5 adsorbs the adsorption plate 7 of the movable shaft 3. The magnetic force of the annular electromagnet 5 is controlled by controlling the magnitude of the annular magnet current. The magnitude of the magnetic force of the electromagnet controls the distance that the adsorption plate 7 lifts the diaphragm 4, thereby controlling the cross-section at the nozzle 1. The size determines the flow rate at the air inlet 9. For example, the greater the magnetic force of the electromagnet, the shorter the distance that the adsorption plate 7 lifts the diaphragm 4, and the slower the flow rate at the nozzle 1. The flow rate at the nozzle 1 affects the rate at which the combustion aid is sucked into the suction chamber 11. The faster the flow rate, the greater the amount of the combustion aid sucked. The size of the opening at the nozzle 1 can be freely adjusted by the magnitude of the electromagnet current through the flow rate control device, thereby controlling the flow rate at the air inlet 9, so that the amount of combustion aid added is inversely proportional to the magnitude of the current, and the amount of combustion aid added is more accurately controlled.

[0026] It should be noted that: the lifting height of the movable shaft 3 to the diaphragm 4 by magnetic force as described above is controlled by the electromagnet control method, which is the most preferred control method. There are also pneumatic and hydraulic control methods. For these two control methods, first of all, it is inconvenient to install and implement, and the pneumatic and hydraulic control methods may be affected by the temperature inside the furnace body, which makes the seals of the pneumatic and hydraulic control methods worse, resulting in poor sealing or even loss of effect. For magnetic force control, the structure is simple and the magnetic force of the electromagnet is less affected by high temperature. For ordinary magnets, high temperature will demagnetize the magnet, but for electromagnets, since the magnetic force of the electromagnet is controlled by current, high temperature has little effect on the electromagnet, so the control method of the electromagnet is the most preferred. For the material of the spring 6 and the adsorption plate 7, the spring 6 should be a material that is not adsorbed by the annular electromagnet 5, and the same adsorption plate 7 material can also be adsorbed by the adsorption plate 7.

[0027] In summary, the present device is used to replace manual control of the air intake volume inside the furnace body 14, and can control the amount of oxygen intake required for each stage of petroleum coke calcination in the furnace body. It is simple and responsive, and can be controlled at any time. It can be combined with the process of adding combustion aids to the calcined petroleum coke system, thereby making it possible to better control the amount of combustion aid added.

Claims

1. A flow rate control device for an environmentally friendly circulating combustion-supporting system for calcining petroleum coke, characterized in that: The flow rate control device is arranged at the nozzle (1) of the ejector assembly, and comprises a sleeve (2) arranged outside the nozzle (1), a movable shaft (3) arranged inside the sleeve (2), a control member arranged inside the sleeve (2), and a flow blocking member arranged inside the nozzle (1); The flow-blocking component is fitted with the movable shaft (3), the flow-blocking component is a diaphragm (4), and the control component is used to control the displacement distance of the movable shaft (3) inside the sleeve (2).

2. The flow rate control device for the environmentally friendly circulating combustion-supporting system for calcining petroleum coke according to claim 1, characterized in that: The control member controls the displacement distance of the movable shaft (3) inside the sleeve (2) through magnetic force.

3. The flow rate control device for the environmentally friendly circulating combustion-supporting system for calcining petroleum coke according to claim 2, characterized in that: The control element comprises an annular electromagnet (5) arranged inside the sleeve (2) and a spring (6) matched with the movable shaft (3); An adsorption plate (7) is provided above the movable shaft (3), the adsorption plate (7) is in contact with the diaphragm (4), and the annular electromagnet (5) adsorbs the adsorption plate (7) of the movable shaft (3).

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