A plasma medical waste melting furnace auxiliary heating device and method

Abstract

The present invention discloses a plasma medical waste melting furnace auxiliary heating device and method. The plasma medical waste melting furnace auxiliary heating device includes a melting furnace, heating mechanisms are symmetrically arranged on both sides of the melting furnace, a solution is arranged in the melting furnace, and an iron layer is arranged at the bottom layer inside the melting furnace; the heating mechanism includes a molybdenum electrode, a DC power supply and an iron rod, the negative pole of the DC power supply is electrically connected to the molybdenum electrode, the positive pole of the DC power supply is electrically connected to the iron rod, the molybdenum electrode is obliquely inserted into the inside of the melting furnace from top to bottom from the side of the melting furnace, and the iron rod is horizontally inserted into the inside of the melting furnace from the side of the melting furnace; it has the advantages of effectively prolonging the service life of the molybdenum electrode, and the iron at the bottom of the melting furnace does not need to be discharged after high-temperature melting, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of melting furnaces, and particularly to a plasma medical waste melting furnace auxiliary heating device and method. Background Art

[0002] Medical waste is the waste generated during medical services such as diagnosis, treatment, and immunization for humans or animals, medical research, biological experiments, and the production of biological products. Its solid waste is harmful or poses multiple health risks, and is infectious or potentially infectious. Medical waste has a complex composition, including infectious, pathological, sharp, pharmaceutical, and chemical wastes, etc., involving different materials such as plastics, glass, metals, and human tissues.

[0003] During the diagnosis and treatment process of controlling the development of the epidemic and blocking the spread of the disease, a large number of disposable medical devices and protective supplies are used at the clinical front line. The generation of these hospital clinical waste contains highly infectious risk viruses. If not properly treated, even during the transportation and disposal process, diseases can be transmitted through the air and contact, endangering human health.

[0004] Currently, traditional methods for treating medical waste include incineration, high-temperature sterilization, chemical treatment, microwave radiation, plasma, electric arc furnace, etc., but they all have shortcomings in dealing with public health emergencies. Developing new medical waste disposal technologies supplemented by practical and effective measures to dispose of medical waste in epidemic areas and related medical departments will improve the overall level of secondary infection prevention during dangerous epidemics, thereby continuously maintaining effective prevention and control quality, enhancing the safety of medical staff and the general public, and having good application prospects. Using plasma technology to treat medical waste has high efficiency and does not require secondary treatment, but the penetration of the plasma torch into the material layer is relatively low, so auxiliary heating is required.

[0005] Therefore, providing a plasma medical waste melting furnace auxiliary heating device and method can solve the above problems. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the penetration of the plasma torch into the material layer is relatively low, so auxiliary heating is required. Using the traditional resistance heating method, due to the presence of iron, short circuits are likely to occur inside the molten pool. Therefore, a plasma medical waste melting furnace auxiliary heating device and method are provided. The plasma medical waste melting furnace auxiliary heating device and method include:

[0007] A melting furnace, the melting furnace is provided with a heating mechanism, a solution is provided inside the melting furnace, and an iron layer is provided at the bottom layer inside the melting furnace;

[0008] The heating mechanism includes molybdenum electrodes, a DC power supply, and an iron rod. The negative electrode of the DC power supply is electrically connected to the molybdenum electrode, and the positive electrode of the DC power supply is electrically connected to the iron rod. The molybdenum electrode is obliquely inserted into the inside of the melting furnace from the side of the melting furnace from top to bottom, and the iron rod is horizontally inserted into the inside of the melting furnace from the side of the melting furnace.

[0009] Further, the iron rod is at the same horizontal level as the bottom inside the melting furnace.

[0010] Further, the liquid level of the solution is higher than the end of the molybdenum electrode located inside the melting furnace.

[0011] Further, the voltage value of the DC power supply is 200V.

[0012] Further, the iron layer is used to connect the iron rod.

[0013] On the other hand, the present invention also provides a method for auxiliary heating of a plasma medical waste melting furnace. The above method includes:

[0014] Put medical waste into the melting furnace;

[0015] Heat the molten slag inside the melting furnace through the heating mechanism so that the molten slag remains in a liquid state at 1400°C;

[0016] If the medical waste contains iron, an iron layer will be formed at the bottom layer inside the melting furnace,

[0017] A protective layer is formed through a reduction reaction at the molybdenum electrode.

[0018] Further, putting medical waste into the melting furnace further includes adding additives such as sodium carbonate into the melting furnace.

[0019] Implementing the present invention has the following beneficial effects:

[0020] 1. The present invention utilizes the principle of an electrolytic cell. Since the iron layer is at the bottom of the molten pool and is connected to the anode of the power supply, iron is oxidized inside the molten pool, so there is no need to drain iron. Since most of the iron in medical waste is stainless steel with a high melting point, through this oxidation method, the melting of iron at too high a temperature of the molten pool is avoided, further extending the service life of the refractory; the molybdenum electrode is connected to the cathode of the power supply, and a reduction reaction occurs around the molybdenum electrode, so that the molybdenum electrode is wrapped by some metals to protect the molybdenum electrode, making the corrosion rate of the molybdenum electrode much lower than that of traditional heating methods and suppressing the consumption of the molybdenum electrode; even if there is iron above the molybdenum electrode, it will not affect the heating and the heating resistance of the molten pool. Description of the Drawings

[0021] Figure 1 is the traditional heating method;

[0022] Figure 2 This is the layout and schematic diagram of the molybdenum electrode of the present invention. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention. Embodiment

[0024] Please refer to the attached drawings of the specification Figure 1-2 , in this embodiment, the technical problem to be solved is that the penetration of the plasma torch into the material layer is relatively low, so auxiliary heating is required. Using the traditional resistance heating method, due to the presence of iron, short circuits are likely to occur inside the molten pool. Therefore, a plasma medical waste melting furnace auxiliary heating device and method are provided. The plasma medical waste melting furnace auxiliary heating device and method include:

[0025] A melting furnace 4, heating mechanisms are symmetrically arranged on both sides of the melting furnace 4, a solution 5 is arranged inside the melting furnace 4, and an iron layer 6 is arranged at the bottom layer inside the melting furnace 4;

[0026] The heating mechanism includes a molybdenum electrode 2, a DC power supply 1, and an iron rod 3. The negative pole of the DC power supply 1 is electrically connected to the molybdenum electrode 2, the positive pole of the DC power supply 1 is electrically connected to the iron rod 3, the molybdenum electrode 2 is obliquely inserted into the inside of the melting furnace 4 from the side of the melting furnace 4 from top to bottom, and the iron rod 3 is horizontally inserted into the inside of the melting furnace 4 from the side of the melting furnace 4.

[0027] The iron rod 3 is at the same horizontal plane as the bottom inside the melting furnace 4.

[0028] The liquid level of the solution 5 is higher than the end of the molybdenum electrode 2 located inside the melting furnace 4.

[0029] The voltage value of the DC power supply 1 is 200V.

[0030] The iron layer 6 is used to connect the two iron rods 3.

[0031] On the other hand, the present invention also provides a method for auxiliary heating of a plasma medical waste melting furnace 4. The above method includes:

[0032] Adding medical waste 5 into the melting furnace 4;

[0033] Heating the inside of the melting furnace 4 through the heating mechanism so that the molten slag is maintained at 1400 °C to form a solution;

[0034] An iron layer 6 is formed at the bottom layer inside the melting furnace 4, and a protective layer is formed at the molybdenum electrode 2.

[0035] Adding medical waste 5 into the melting furnace 4 also includes adding additives such as sodium carbonate into the melting furnace 4.

[0036] The medical waste in the melting furnace is heated by a plasma torch. Since the plasma torch jet is limited and cannot penetrate the internal solution of the molten pool, and at the same time, a large amount of metallic iron is contained in the medical waste, such as stainless steel scalpels, stainless steel needles, etc., and because the melting point of such metals is relatively high. To ensure production efficiency, the temperature of the molten pool needs to be maintained at a high temperature of 1400 °C, so that the slag is in a molten state for easy discharge. Using the traditional resistance heating method, due to the presence of iron, short circuits are likely to occur inside the molten pool, such as Figure 1 ;

[0037] P = I 2 R (4 - 1)

[0038] It can be seen from Equation 4 - 1 that the power input into the molten pool is proportional to the resistance. If long strips of iron with different lengths in the medical waste fall with the medical waste, they may be carried between the two electrodes, resulting in a short circuit, and R becomes very low, that is, P is very low, resulting in the inability to input electric power into the interior of the molten pool;

[0039] This solution uses two DC power supplies, which can meet the rated output of 400V and 1500A, and has the ability of constant voltage, constant current, and constant power control; the negative pole of the constant current source is connected to the molybdenum electrode, and the molybdenum electrode is inserted into the melting furnace. The solution submerges the molybdenum electrode in the melting furnace to prevent the molybdenum electrode from being oxidized. The positive pole of the DC power supply is connected to an iron rod extending from the furnace bottom through a wire, and the iron rod is connected to the iron layer inside the melting furnace. A certain amount of sodium carbonate is added to the solution. After power is turned on, the current flows out from the positive pole of the power supply, passes through the iron rod and the iron layer, and then passes through the slag. During this process, the slag is heated, reaches the molybdenum electrode, and then flows into the negative pole of the power supply through the molybdenum electrode. In this way, a complete conductive circuit and heating circuit are formed.

[0040] In this process, first, the slag is heated to keep the slag at 1400 °C. The iron layer is formed by the sinking and piling up of iron in the medical waste. Secondly, since most of this iron is stainless steel, its melting point is very high, exceeding 1500 °C. Therefore, direct melting requires a very high temperature, which will damage the melting furnace. This method makes the iron melt into the slag in the form of other compounds through an oxidation method, and there is no need to discharge iron. Finally, since the molybdenum electrode is connected to the negative pole of the power supply as the cathode, there are reduced metal ions near the molybdenum electrode, which protects the molybdenum electrode from being oxidized and eroded, and extends the service life of the molybdenum electrode.

[0041] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0042] In the present invention, unless otherwise clearly specified and defined, terms such as "installed", "set", "connected", "fixed", "swivelly connected", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly defined, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An auxiliary heating device for a plasma medical waste melting furnace, characterized in that, It includes a melting furnace, the melting furnace is provided with a heating mechanism, there is a solution inside the melting furnace, and an iron layer is provided at the bottom layer inside the melting furnace; The heating mechanism includes a molybdenum electrode, a DC power supply and an iron rod. The negative electrode of the DC power supply is electrically connected to the molybdenum electrode, the positive electrode of the DC power supply is electrically connected to the iron rod. The molybdenum electrode is obliquely inserted into the inside of the melting furnace from the side of the melting furnace from top to bottom, and the iron rod is horizontally inserted into the inside of the melting furnace from the side of the melting furnace; The iron rod is at the same horizontal plane as the bottom inside the melting furnace; The liquid level of the solution is higher than the end of the molybdenum electrode located inside the melting furnace; The iron layer is used to connect the two iron rods.

2. The plasma medical waste melting furnace auxiliary heating device according to claim 1, wherein, The voltage value of the DC power supply is 200V.

3. A method for auxiliary heating of a plasma medical waste melting furnace, which uses the plasma medical waste melting furnace auxiliary heating device described in claim 1 or 2, and is characterized in that, It includes: Put medical waste into the melting furnace; Heat the slag inside the melting furnace through the heating mechanism so that the slag remains at 1400 °C to form a liquid state; If the medical waste contains iron, an iron layer will be formed at the bottom layer inside the melting furnace, A protective layer is formed by a reduction reaction occurring at the molybdenum electrode.

4. The plasma medical waste melting furnace auxiliary heating method according to claim 3, wherein The step of putting medical waste into the melting furnace further includes adding a sodium carbonate additive into the melting furnace.

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