Electrolytic aluminum anode production line heating system and intelligent control system thereof

Abstract

The invention discloses an electrolytic aluminum anode production line heating system and an intelligent control system thereof, and the system comprises an asphalt receiving, storing and conveying thermal insulation system, a preheating spiral dry material heating system and an under-enthalpy water mixer which are sequentially arranged on a main steam pipeline, the preheating spiral dry material heating system is used for heating heat-conducting oil, the kneading machine dry material heating system is connected with the preheating spiral dry material heating system, the heat-conducting oil closed operation collecting system is connected with the kneading machine dry material heating system, and the preheating spiral dry material heating system and the kneading machine dry material heating system adopt medium-temperature medium-pressure steam to heat the heat-conducting oil. The asphalt receiving, storing and conveying thermal insulation system adopts medium-temperature and low-pressure steam for heating; according to the invention, under the condition that the kneading machine and the premixing spiral production line in the production workshop are not replaced, the steam is adopted to indirectly heat the dry materials in the kneading machine and the premixing spiral equipment, and an original heat conduction oil open system is changed into a closed system, so that the purposes of meeting the safety production requirement and increasing the yield and the efficiency can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of anode production, and in particular to a heating system for an electrolytic aluminum anode production line and an intelligent control system thereof. Background Art

[0002] The production process of anodes is an important link in the aluminum electrolysis industry. Its main raw materials are roasted coal coke and electrode coal coke. The heat medium system is an indispensable component. The pre-baked anode industry in my country generally uses a thermal oil system to transfer the heat of fuel combustion or the waste heat of metallurgical furnaces to heat-using equipment. The thermal oil system consists of a thermal oil boiler, thermal oil, a transmission pipeline, and heat-using equipment. The pre-baked anode industry mostly uses the waste heat of tail gas from kilns such as calcining furnaces and rotary kilns or the heat of fuel combustion such as natural gas and heavy oil as heat sources, heats the thermal oil in a thermal oil boiler, and transports the hot oil to kneading machines, preheating screws, asphalt melting tanks and other heat-using equipment through oil pumps and transmission pipelines. There are safety risks, environmental pollution, high energy consumption and other problems.

[0003] In order to solve the above problems, the present invention provides an electrolytic aluminum anode production line heating system and an intelligent control system thereof to solve the above problems. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a heating system for an electrolytic aluminum anode production line and an intelligent control system thereof, which removes the original thermal oil boiler and uses medium-temperature and medium-pressure steam to heat or keep the anode production materials warm; it replaces the original thermal oil heating system, effectively eliminates safety hazards such as leakage, coking, and explosion of the thermal oil pipeline, and reduces the equipment operation and maintenance costs, which is of great significance to the enterprise's safe production, energy conservation and consumption reduction, and environmental protection.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] A heating system for an electrolytic aluminum anode production line comprises an asphalt insulation system, a preheating spiral dry material heating system and a deficient enthalpy water mixer which are sequentially arranged on the main steam pipeline, a kneading machine dry material heating system connected to the preheating spiral dry material heating system, and a heat transfer oil closed operation system connected to the kneading machine dry material heating system; the preheating spiral dry material heating system and the kneading machine dry material heating system use medium-temperature and medium-pressure steam to heat the heat transfer oil, and the asphalt insulation system uses medium-temperature and low-pressure steam for heating.

[0007] Preferably, the asphalt insulation system comprises a temperature reduction and pressure reduction device connected to the main steam pipeline, and an asphalt storage tank and an asphalt delivery pipeline connected in parallel to the temperature reduction and pressure reduction device, and the asphalt storage tank and the asphalt delivery pipeline are connected to the water mixer.

[0008] Preferably, the preheating spiral dry material heating system comprises a preheating spiral final stage heat exchanger unit connected to the main steam pipeline, at least two preheating spiral primary heat exchanger units connected in parallel with the preheating spiral final stage heat exchanger unit, and at least two preheating spirals connected in parallel with the preheating spiral final stage heat exchanger unit, the under-enthalpy water of the preheating spiral primary heat exchanger unit is connected to the water mixer, and the preheating spiral is connected to the kneader dry material heating system.

[0009] Preferably, the kneader dry material heating system comprises at least two kneaders connected in series, and the kneaders are connected to the preheating spiral.

[0010] Preferably, the closed operation system of the heat transfer oil comprises a heat transfer oil storage tank connected to the kneading machine and a heat transfer oil expansion tank connected to the heat transfer oil.

[0011] Preferably, the threaded tubes in the preheating spiral final stage heat exchanger unit and the preheating spiral primary heat exchanger unit are made by rolling, and spiral grooves are formed on the outer surface of the furnace tubes, and spiral protrusions are formed on the inner surface of the furnace tubes.

[0012] Preferably, the asphalt transportation pipeline adopts a segmented jacketed pipe steam heating method.

[0013] An intelligent control system includes a PLC control system, wherein the PLC control system includes a centralized display screen, an industrial control host, a first control cabinet connected to the industrial control host, and a second control cabinet and a third control cabinet connected in parallel with the first control cabinet, wherein the first control cabinet is used to control the temperature reduction and pressure reduction device, and the second control cabinet is used to control the preheating spiral dry material heating system, the kneading machine dry material heating system and the heat transfer oil collection system.

[0014] Preferably, the centralized display screen, the industrial control host, and the first control cabinet are arranged in a central control room.

[0015] Preferably, the centralized display screen, the industrial control host, the first control cabinet, the second control cabinet and the third control cabinet are all connected via optical fibers.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The premixing screw and kneading machine use medium-temperature and medium-pressure steam to heat the heat transfer oil, and the asphalt storage tank uses a medium-temperature and low-pressure steam heating system to achieve energy cascade utilization and system process optimization, meet the heat exchange and heat transfer functions of the anode production equipment parameters and process conditions, and improve the stability, safety, energy utilization efficiency and production efficiency of the entire system; in addition, the original heat transfer oil boiler will be dismantled and replaced with medium-temperature and medium-pressure steam to heat or keep the anode production materials warm; replace the original heat transfer oil heating system, and change the original heat transfer oil open system to a closed system, effectively eliminating safety hazards such as leakage, coking, and explosion of heat transfer oil pipelines, while reducing equipment operation and maintenance costs, which is of great significance to enterprise safety production, energy conservation and consumption reduction, and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0019] Attached Figure 1 It is a structural schematic diagram of the present invention.

[0020] Among them, 1. Main steam pipeline; 2. Cooling and pressure reducing device; 3. Water mixer; 4. Thermal oil storage tank; 5. Thermal oil expansion tank; 6. Preheating spiral; 7. Preheating spiral final stage heat exchanger unit; 8. Hot spiral primary heat exchanger unit; 9. Asphalt transportation pipeline; 10. Asphalt storage tank; 11. Kneading machine. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The purpose of the present invention is to provide a heating system for an electrolytic aluminum anode production line and an intelligent control system thereof, to dismantle the original thermal oil boiler and use medium-temperature medium-pressure steam to heat or keep the anode production materials warm; to replace the original thermal oil heating system, and to change the original thermal oil open system into a closed system, so as to effectively prevent the safety hazards such as leakage, coking, and explosion of the thermal oil pipeline, and at the same time reduce the equipment operation and maintenance costs, which is of great significance to the enterprise's safe production, energy conservation and consumption reduction, and environmental protection.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] refer to Figure 1 , a heating system for an electrolytic aluminum anode production line, comprising an asphalt insulation system, a preheating spiral dry material heating system and a water mixer sequentially arranged on the main steam pipeline, a kneading machine dry material heating system connected to the preheating spiral dry material heating system, and a heat transfer oil closed operation system connected to the kneading machine dry material heating system; the preheating spiral dry material heating system and the kneading machine dry material heating system use medium-temperature medium-pressure steam to heat the heat transfer oil, and the asphalt insulation system uses medium-temperature low-pressure steam to heat; the preheating spiral dry material heating system and the kneading machine use medium-temperature medium-pressure steam to heat the heat transfer oil, and the asphalt storage tank uses medium-temperature low-pressure steam to heat The steam heating system realizes the cascade utilization of energy and the optimization of system processes, satisfies the heat exchange and heat transfer functions of the anode production equipment parameters and process conditions, and improves the stability, safety, energy utilization efficiency and production efficiency of the entire system. In addition, the original thermal oil boiler is dismantled and replaced with medium-temperature and medium-pressure steam to heat or keep the anode production materials warm. The original thermal oil heating system is replaced and the original thermal oil open system is changed to a closed system, which effectively eliminates the hidden dangers of thermal oil pipeline leakage, coking, explosion, thermal oil oxidation, etc., while reducing the equipment operation and maintenance costs, which is of great significance to the enterprise's safe production, energy conservation and consumption reduction, and environmental protection.

[0025] Furthermore, the temperature reduction and pressure reduction device is a set of Venturi water spray temperature reduction device, including temperature reduction water preparation, flow control, temperature reduction and pressure reduction device, etc. It is responsible for providing the steam required for heating and heat preservation of the asphalt tank.

[0026] refer to Figure 1 The asphalt insulation system includes a temperature reduction and pressure reduction device connected to the main steam pipeline, and an asphalt storage tank and an asphalt delivery pipeline connected in parallel with the temperature reduction and pressure reduction device. The asphalt storage tank and the asphalt delivery pipeline are connected to the water mixer.

[0027] refer to Figure 1 The preheating spiral dry material heating system includes a preheating spiral final stage heat exchange unit connected to the main steam pipeline, at least two preheating spiral primary heat exchange units connected in parallel with the preheating spiral final stage heat exchange unit, and at least two preheating spirals connected in parallel with the preheating spiral final stage heat exchange unit. The under-enthalpy water of the preheating spiral primary heat exchange unit is connected to the water mixer, and the preheating spiral is connected to the kneader dry material heating system.

[0028] refer to Figure 1 The kneading machine dry material heating system includes at least two kneading machines connected in series, and the kneading machines are connected to the preheating spiral.

[0029] refer to Figure 1 The closed operation system of the heat transfer oil includes a heat transfer oil storage tank connected to the kneading machine and a heat transfer oil expansion tank connected to the heat transfer oil.

[0030] Furthermore, the threaded tubes in the preheating spiral final stage heat exchanger and the preheating spiral primary heat exchanger are made by rolling, with spiral grooves formed on the outer surface of the furnace tube and spiral protrusions formed on the inner surface of the furnace tube; when the thread groove is shallow, additional turbulence is mainly formed near the inner wall of the furnace tube, and the heat transfer oil pulsation is also mainly propagated near the inner wall of the furnace tube, which is beneficial to the agitation of the boundary layer, while the impact on the mainstream is small. If the thread pitch is also small, when the agitation effect of the previous thread groove on the boundary layer is weakened, the existence of the next thread groove causes the boundary layer to be agitated again. On the one hand, the agitation effect on the boundary layer is sufficient, and on the other hand, the increase in the power consumption of the circulating oil pump is small.

[0031] Furthermore, for the heat transfer oil, due to the presence of the spiral grooves and protrusions, the boundary layer of the heat transfer oil in the furnace tube is disturbed, thereby reducing thermal resistance, increasing heat transfer, preventing the heat transfer oil from coking, and extending the life of the heat transfer oil, thereby achieving the effect of enhancing heat transfer and preventing coking.

[0032] Furthermore, pipeline heating design generally only considers the heat loss of the medium in the pipe during the transportation process or during the suspension period to maintain the required operating temperature. The asphalt transportation pipeline adopts the segmented jacketed pipe steam heating method, which can effectively control the temperature and ensure the uniformity and stability of the asphalt temperature.

[0033] Furthermore, the original open heat transfer oil system was changed to a closed system, the heat transfer oil operation pipe was greatly shortened, and the heat transfer oil consumption was reduced to one tenth of the original. The heat transfer oil brand L-QB300 was replaced with L-QC320, the heat transfer oil thermal stability was improved, and oxidation and coking would not occur in the system. The closed system eliminates safety hazards, reduces operating energy consumption, and greatly saves the cost of using heat transfer oil.

[0034] refer to Figure 1 , each pipeline is equipped with relevant automatic regulating valves

[0035] Furthermore, an intelligent control system includes a PLC control system, the PLC control system includes a centralized display screen, an industrial control host, a first control cabinet connected to the industrial control host, and a second control cabinet and a third control cabinet connected in parallel with the first control cabinet, the first control cabinet is used to control the temperature reduction and pressure reduction device, the second control cabinet is used to control the preheating spiral dry material heating system, the kneading machine dry material heating system and the thermal oil closed operation system; the three circulation systems of the thermal oil system in the molding workshop of the anode material, the steam transmission and the main parameters (temperature, pressure, flow) of the under-enthalpy water return pipeline are intelligently and centrally controlled. Ensure that the main parameters in the process flow can always be within a range that meets the process requirements to ensure normal and stable production operation.

[0036] Furthermore, the PLC central control system has an access port for important monitoring parameters that are incorporated into the main monitoring room; a large display screen is configured in the central control room to facilitate operators to observe the operating status of the entire system in all directions; parameters of various key points collected on-site are centralized in the central control room of this system for display, control and setting; the PLC control box can directly operate and monitor the working status of on-site pressure, temperature, liquid level, flow meters, regulating actuators and other terminal equipment.

[0037] Furthermore, the centralized display screen, the industrial control host, and the first control cabinet are arranged in the central control room.

[0038] Furthermore, the centralized display screen, the industrial control host, the first control cabinet, the second control cabinet and the third control cabinet are all connected via optical fibers.

[0039] Adaptive changes made according to actual needs are all within the protection scope of the present invention.

[0040] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A heating system for an electrolytic aluminum anode production line, characterized in that: It includes an asphalt insulation system, a preheating spiral dry material heating system and a deficient enthalpy water mixer which are sequentially arranged on the main steam pipeline, a kneading machine dry material heating system connected to the preheating spiral dry material heating system, and a heat transfer oil closed operation system connected to the kneading machine dry material heating system. The preheating spiral dry material heating system and the kneading machine dry material heating system use medium-temperature and medium-pressure steam to heat the heat transfer oil, and the asphalt insulation system uses medium-temperature and low-pressure steam for heating.

2. The electrolytic aluminum anode production line heating system according to claim 1 is characterized in that: The asphalt insulation system includes a temperature reduction and pressure reduction device connected to the main steam pipeline, and an asphalt storage tank and an asphalt delivery pipeline connected in parallel to the temperature reduction and pressure reduction device. The asphalt storage tank and the asphalt delivery pipeline are connected to the water mixer.

3. The electrolytic aluminum anode production line heating system according to claim 1 is characterized in that: The preheating spiral dry material heating system includes a preheating spiral final stage heat exchange unit connected to the main steam pipeline, at least two preheating spiral primary heat exchange units connected in parallel with the preheating spiral final stage heat exchange unit, and at least two preheating spirals connected in parallel with the preheating spiral final stage heat exchange unit. The under-enthalpy water of the preheating spiral primary heat exchange unit is connected to the water mixer, and the preheating spiral is connected to the kneader dry material heating system.

4. The electrolytic aluminum anode production line heating system according to claim 3 is characterized in that: The kneader dry material heating system comprises at least two kneaders connected in series, and the kneaders are connected to the preheating spiral.

5. The electrolytic aluminum anode production line heating system according to claim 4 is characterized in that: The closed operation system of the heat transfer oil comprises a heat transfer oil storage tank connected to the kneading machine and a heat transfer oil expansion tank connected to the heat transfer oil.

6. The electrolytic aluminum anode production line heating system according to claim 4, characterized in that: The threaded tubes in the preheating spiral final stage heat exchanger unit and the preheating spiral primary heat exchanger unit are made by rolling, and spiral grooves are formed on the outer surface of the furnace tube, and spiral protrusions are formed on the inner surface of the furnace tube.

7. The electrolytic aluminum anode production line heating system according to claim 1, characterized in that: The asphalt transportation pipeline adopts segmented jacketed pipe steam heating method.

8. An intelligent control system, characterized in that: The heating system of the electrolytic aluminum anode production line applied to any one of claims 1 to 7 comprises a PLC control system, wherein the PLC control system comprises a centralized display screen, an industrial control host, a first control cabinet connected to the industrial control host, and a second control cabinet and a third control cabinet connected in parallel with the first control cabinet, wherein the first control cabinet is used to control the temperature reduction and pressure reduction device, and the second control cabinet is used to control the preheating spiral dry material heating system, the kneading machine dry material heating system, and the closed operation and collection system of the heat transfer oil.

9. The intelligent control system according to claim 8, characterized in that: The centralized display screen, the industrial control host, and the first control cabinet are arranged in the central control room.

10. The intelligent control system according to claim 8, characterized in that: The centralized display screen, the industrial control host, the first control cabinet, the second control cabinet and the third control cabinet are all connected via optical fibers.

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