Plasma treatment system for medical waste treatment and hydrogen recovery and treatment method thereof

Abstract

The invention discloses a plasma treatment system for medical waste treatment and hydrogen recovery and a treatment method thereof. The system comprises a pretreatment and feeding system, a stock bin, a plasma gasification furnace, a waste heat boiler, an ash residue collection system, a tail gas treatment system, a hydrogen recovery system and a public and auxiliary system which are communicated in sequence. Wherein a plasma generator is arranged at the middle lower part of the body of the plasma gasification furnace. Volume reduction, weight reduction and harmless treatment of medical waste can be achieved, and meanwhile recyclable hydrogen is generated.

Description

Technical Field

[0001] This application relates to a plasma treatment system and method for treating medical waste and recovering hydrogen. Background Technology

[0002] Currently, medical waste is mainly treated using high-temperature steam, microwave sterilization, chemical methods, and incineration. However, these three methods cannot achieve the goal of reducing the volume of medical waste. The treated medical waste is still solid waste and needs to be sent back to the incinerator or sorted and recycled. In traditional incineration processes, the residue and fly ash after incineration are still hazardous waste, and the combustion is incomplete, resulting in low volume reduction. Solidification processes and dedicated landfills are still required, and the environmental hazards of dioxin and heavy metal leaching cannot be avoided during this process.

[0003] Therefore, how to achieve harmless treatment, reduced emissions, and resource utilization of medical waste is an urgent problem to be solved in this field. Summary of the Invention

[0004] This invention addresses the shortcomings of existing medical waste treatment technologies, such as incomplete combustion, low volume reduction, the need for solidification processes and dedicated landfills, and the environmental hazards of dioxin and heavy metal leaching. It provides a plasma treatment system and method for treating medical waste and recovering hydrogen. This invention enables the harmless treatment, volume reduction, and resource reuse of medical waste.

[0005] To solve the above-mentioned technical problems, this application provides a plasma treatment system for medical waste treatment and hydrogen recovery, characterized in that it includes a pretreatment and feeding system, a silo, a plasma gasification furnace, a waste heat boiler, an ash collection system, a tail gas treatment system, a hydrogen recovery system and an auxiliary system (not shown in the figure) connected in sequence.

[0006] The plasma generator is located in the lower middle part of the plasma gasification furnace body.

[0007] In this invention, the pretreatment and feeding system includes an integrated crushing and high-temperature waste crushing and feeding machine (not shown in the figure), which consists of a main body (not shown in the figure), a sealing door (not shown in the figure), a stirring mechanism (not shown in the figure), a crushing mechanism (not shown in the figure), a pipeline system (not shown in the figure), and a control system (not shown in the figure).

[0008] Preferably, the ash collection system includes a slag pool.

[0009] Preferably, the exhaust gas treatment system includes a semi-dry desulfurization quench tower, a bag filter, a cooler, and a purification desulfurization tower.

[0010] Preferably, the hydrogen recovery system includes a Roots blower, a gas storage tank, a compressor, a PSA-TSA hydrogen purification unit, and a hydrogen storage tank.

[0011] Preferably, the auxiliary systems include a steam boiler, a compressed air system, a nitrogen generation system, and a soft water system.

[0012] In this invention, the plasma gasification furnace is an adiabatic reactor.

[0013] Preferably, the plasma gasification furnace is a vertical fixed-bed atmospheric pressure gasification furnace.

[0014] Preferably, the components of the plasma gasification furnace include: a furnace body (not shown in the figure), an inner lining feed inlet (not shown in the figure), a temperature measuring point (not shown in the figure), a combustion gas inlet (not shown in the figure), a waste liquid injection inlet (not shown in the figure), and an observation port (not shown in the figure).

[0015] Preferably, the material of the inner wall of the plasma gasification furnace (not shown in the figure) is a refractory material, more preferably a lightweight refractory insulation material, and even more preferably a lightweight refractory insulation material that is acid-resistant, wear-resistant, high-temperature resistant, and resistant to alternating temperature stress.

[0016] Preferably, the furnace body of the plasma gasification furnace is made of steel.

[0017] Preferably, the plasma gasification furnace body adopts a cylindrical structure.

[0018] Preferably, the plasma gasification furnace has dimensions of φ1700×6500mm.

[0019] Preferably, the lower part of the plasma gasification furnace is equipped with six 200 kW plasma generators (4 in operation and 2 on standby), and may further include four gasification nozzles (not shown in the figure). Metered compressed air enters the plasma generators, is ionized to form plasma, and is used to maintain the temperature of the melting zone in the plasma gasification furnace, with the melting temperature above 1300 °C. The energy required for the gasification and melting of medical waste comes partly from the plasma and partly from the heat released by the oxidation reaction of the medical waste itself.

[0020] Preferably, the lower part of the plasma gasification furnace body is a slag discharge section (not shown in the figure), the slag discharge section is equipped with a demineralized water cooling device (not shown in the figure) and its lower part is inserted into the slag pool.

[0021] Preferably, a slag discharge burner (not shown in the figure) is provided between the body of the plasma gasification furnace and the slag discharge section, and the fuel used for the burner is preferably natural gas; the burner is cooled by air compressed by an air compressor.

[0022] Preferably, the plasma generator employs a water-cooled non-transfer arc method, which offers stable ignition, long cathode life, simple structure, small size, convenient installation, easy maintenance, and higher electrothermal conversion efficiency than common transfer arc methods. The carrier air required by the plasma generator comes from a compressed air system (or a separately installed air compressor), with a single generator consuming 70 Nm³ of air. 3 / h.

[0023] Preferably, the plasma generator is connected to a compressed air system or a separately installed air compressor.

[0024] Preferably, the plasma generator is equipped with a pneumatic ball valve (not shown in the figure), a pressure regulating valve (not shown in the figure), and a pressure switch (not shown in the figure).

[0025] Preferably, the plasma generator employs water-cooled generator electrodes.

[0026] Preferably, the plasma generator is connected to a cooling water system, which is preferably a closed-loop cooling water system. The closed-loop cooling water system consists of a water tank (not shown in the figure), two pipeline booster pumps (not shown in the figure), a heat exchanger (not shown in the figure), related instruments (not shown in the figure), and a control cabinet (not shown in the figure).

[0027] Preferably, the plasma generator uses a high-power DC regulated power supply, such as an IGBT high-frequency inverter switching DC power supply.

[0028] In this invention, the waste heat boiler is a horizontally placed heat exchange boiler.

[0029] Preferably, the outlet of the waste heat boiler is located at the bottom of the waste heat boiler.

[0030] In this invention, an alkaline atomizing spray gun is installed inside the semi-dry deacidification quench tower; the alkaline atomizing spray gun is preferably connected to an alkaline tank (not shown in the figure), and the alkaline tank is equipped with a valve (not shown in the figure).

[0031] Preferably, the inlet of the semi-dry deacidification quench tower is located at the bottom of the semi-dry deacidification quench tower, and the outlet of the semi-dry deacidification quench tower is located at the top of the semi-dry deacidification quench tower.

[0032] Preferably, the outlet of the waste heat boiler is connected to the inlet of the semi-dry deacidification quench tower.

[0033] Preferably, the inlet of the bag filter is located at the top of the bag filter.

[0034] Preferably, the bag filter is equipped with an external insulation device and a dust collection bin at the bottom.

[0035] Preferably, the cooler is a shell-and-tube cooler.

[0036] Preferably, the inlet of the cooler is located at the top of the cooler, and the outlet of the cooler is located at the bottom of the cooler.

[0037] Preferably, a gas-liquid separator is provided at the outlet of the cooler.

[0038] Preferably, the inlet of the purification and desulfurization tower is located at the bottom of the purification and desulfurization tower, and the outlet of the purification and desulfurization tower is located at the top of the purification and desulfurization tower.

[0039] Preferably, the outlet of the cooler is connected to the inlet of the purification and desulfurization tower.

[0040] Preferably, the purification and desulfurization tower is provided with a drying layer (not shown in the figure), an activated carbon adsorption layer (not shown in the figure), and a desulfurization layer (not shown in the figure).

[0041] Preferably, the outlet of the purification desulfurization tower is connected to a gas storage tank via a Roots blower.

[0042] Preferably, the gas storage tank is connected to the PSA-TSA hydrogen purification device via a compressor.

[0043] Preferably, the PSA-TSA hydrogen purification device is provided with an exhaust gas discharge device at the top and an outlet at the bottom.

[0044] Preferably, the outlet of the PSA-TSA hydrogen purification device is connected to a hydrogen storage tank.

[0045] The present invention provides a plasma treatment system for treating medical waste and recovering hydrogen as described above, comprising a pretreatment and feeding system, a silo, a plasma gasification furnace, a waste heat boiler, a semi-dry deacidification quench tower, a bag filter, a cooler, a purification desulfurization tower, a Roots blower, a gas storage tank, a compressor, a PSA-TSA hydrogen purification device, and a hydrogen storage tank connected in sequence.

[0046] The plasma gasification furnace has a plasma generator located in the lower middle part of its main body; the plasma generator is connected to an air compressor; the plasma generator is connected to a cooling water system; and a slag pool is located at the bottom of the plasma gasification furnace.

[0047] The present invention also provides a plasma treatment system method for treating medical waste and recovering hydrogen, characterized in that it uses the plasma treatment system for treating medical waste and recovering hydrogen as described above.

[0048] In this invention, the working pressure of the pretreatment and feeding system is -250~3800 Pa.

[0049] Preferably, the operating temperature of the pretreatment and feeding system is -250~3800 Pa.

[0050] Preferably, the outlet temperature of the plasma gasification furnace is 850-1000℃.

[0051] Preferably, the melting temperature in the plasma gasification furnace is above 1300 °C.

[0052] Preferably, the plasma generator has a gas consumption of 70 Nm³ per unit. 3 / h.

[0053] Preferably, the cooling water in the water-cooled generator electrode is demineralized water.

[0054] Preferably, the inlet temperature of the waste heat boiler is 850-1000℃, for example, 1000℃.

[0055] Preferably, the outlet temperature of the waste heat boiler is 400-600℃, for example, 500℃.

[0056] In this invention, the inlet temperature of the semi-dry deacidification quench tower in the exhaust gas treatment system is 400-600℃, for example, 500℃.

[0057] Preferably, the outlet temperature of the semi-dry deacidification quench tower in the exhaust gas treatment system is 170-190°C, for example, 180°C.

[0058] Preferably, the gas flow rate inside the semi-dry deacidification quench tower in the tail gas treatment system is 1-1.5 m / s, for example, 1.2 m / s.

[0059] Preferably, the quenching time of the semi-dry deacidification quench tower in the exhaust gas treatment system is less than 1 second.

[0060] Preferably, the semi-dry deacidification quench tower in the exhaust gas treatment system contains an alkaline solution, which is preferably a sodium bicarbonate solution.

[0061] Preferably, the inlet temperature of the bag filter in the exhaust gas treatment system is 170-190°C, for example, 180°C.

[0062] Preferably, the outlet temperature of the bag filter in the exhaust gas treatment system is 170-190°C, for example, 180°C.

[0063] Preferably, the filtration accuracy of the bag filter in the exhaust gas treatment system is 0.08-0.12μm, for example, 0.1μm.

[0064] Preferably, the inlet temperature of the cooler in the exhaust gas treatment system is 170-190°C, for example, 180°C.

[0065] Preferably, the outlet temperature of the cooler in the exhaust gas treatment system is 40-60°C, for example, 50°C.

[0066] Preferably, the cooling water inlet pressure of the cooler in the exhaust gas treatment system is 0.4-0.6 MPa, for example, 0.4 MPa.

[0067] Preferably, the cooling water return pressure of the cooler in the exhaust gas treatment system is 0.1-0.3 MPa, for example, 0.2 MPa.

[0068] Preferably, the heat exchange area of ​​the cooler in the exhaust gas treatment system is 3-5 m². 2 For example, 4 m 2 .

[0069] In this invention, the Roots blower in the hydrogen recovery system pressurizes the purified syngas to 40-60 kPa, for example, 50 kPa.

[0070] Preferably, in the hydrogen recovery system, the compressor pressurizes the purified syngas to 1.0-3.0 MPa, for example, 2.0 MPa.

[0071] The present invention also provides an application of the plasma treatment system for treating medical waste and recovering hydrogen as described above in the treatment of medical waste.

[0072] In this invention, the plasma gasifier is used for the pyrolysis and gasification of medical waste. The lower part of the plasma gasifier body is a slag discharge section, which is equipped with demineralized water cooling and its lower part (i.e., the lower slag skirt) is inserted into the slag pool to a certain depth. Molten glass formed from inorganic matter falls through the slag discharge section into the bottom slag pool for rapid cooling, forming 2-5mm glassy slag, which is periodically removed by a slag remover and transported for general solid waste treatment. A slag discharge burner is installed between the gasifier body and the slag discharge section, using natural gas as fuel. The slag discharge burner ensures smooth liquid slag discharge. All burners are cooled by compressed air.

[0073] The plasma gasification furnace includes a furnace body and a plasma generator disposed within the furnace body. The furnace body is used to receive residues that have not been completely pyrolyzed and gasified in the gasification furnace. The plasma generator is used to heat the residues, decompose the organic matter in the residues to produce flue gas and crude syngas, and melt the inorganic matter in the residues into liquid glassy slag. The flue gas and crude syngas are directly fed into a waste heat boiler, where heat is recovered and utilized. The superheated steam generated by the waste heat recovery boiler can be used for high-temperature disinfection and drying of medical waste.

[0074] The cooled syngas enters the semi-dry deacidification quench tower from the bottom. Several alkali atomizing spray guns are installed inside the tower. The alkali solution (a sodium bicarbonate solution of a certain concentration) is pumped from the alkali tank into the spray guns, and the flow rate is controlled by valves. The syngas entering from the bottom of the tower moves upwards and encounters the atomized alkali solution sprayed downwards from the top. Acidic gases such as HCl and H2S in the syngas are removed, and the temperature of the syngas drops rapidly.

[0075] The cooled syngas enters the bag filter to collect the fine ash in the gas. The bag filter is equipped with external insulation and has an ash collection bin at the bottom.

[0076] After ash removal, the gas enters a (tube-type) cooler and is cooled to 50°C. A gas-liquid separator is installed at the outlet of the cooler, and the condensate is discharged into the wastewater pipe and enters the sewage system.

[0077] The cooled gas then enters the purification and desulfurization tower, which is equipped with a drying layer, an activated carbon adsorption layer, and a desulfurization layer to remove small amounts of water vapor, trace amounts of sulfides, and heavy metal compounds from the gas, thus preventing poisoning of the adsorption catalyst in the downstream PSA-TSA hydrogen purification unit.

[0078] The gas is pressurized by a Roots blower (which provides a slightly negative pressure environment for the plasma gasification furnace and powers the plasma gasification melting system) before entering a gas storage tank. It is then further pressurized by a compressor (the hydrogen compressor powers the PSA-TSA hydrogen purification unit) before entering the PSA-TSA hydrogen purification unit to purify and separate H2 from other gases. Waste gas containing CO enters the flare system, while H2 is stored in the hydrogen storage tank. The hydrogen in the storage tank can power hydrogen fuel cell vehicles such as hydrogen buses and heavy-duty trucks through hydrogen refueling stations, or it can be used for electricity storage in large-scale hydrogen fuel cell energy storage systems.

[0079] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of the present invention.

[0080] The reagents and raw materials used in this invention are all commercially available.

[0081] The positive and progressive effects of this invention are as follows:

[0082] The plasma treatment system and method for treating medical waste and recovering hydrogen of the present invention can achieve harmless treatment, reduced emissions and resource reuse of medical waste. Attached Figure Description

[0083] Figure 1 This is a simplified process flow diagram of the plasma gasification melting hydrogen production system in Example 1.

[0084] Explanation of reference numerals in the attached figures

[0085] Pre-processing and feeding system 0

[0086] Silo 1

[0087] Plasma gasification furnace 2

[0088] Air compressor 3

[0089] Plasma Generator 4

[0090] Slag Pool 5

[0091] Waste heat boiler 6

[0092] Semi-dry deacidification quenching tower 7

[0093] Baghouse dust collector 8

[0094] Cooler 9

[0095] Purification and desulfurization tower 10

[0096] Roots blower 11

[0097] Gas storage tank 12

[0098] Compressor 13

[0099] PSA-TSA Hydrogen Purification Unit 14

[0100] Hydrogen storage tank 15

[0101] Exhaust gas treatment system 16

[0102] Hydrogen recovery system 17

[0103] Ash Collection System 18 Detailed Implementation

[0104] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0105] Composition of medical waste

[0106] Medical waste has a wide range of sources and a complex composition. It can be divided into ten categories: disposable plastic products, disposable paper products, disposable rubber products, disposable examination instruments, laboratory waste, various surgical wastes, animal test specimens, wastewater treatment sludge, dressings, and expired medications. These ten categories can be further divided into two main types: inorganic and organic waste. The composition and calorific value of medical waste vary greatly between different cities and different hospitals. Calorific value is closely related to the content of organic matter. Waste with high plastic and fiber content has a relatively high calorific value; while waste with high glass and moisture content has a relatively low calorific value.

[0107] Medical waste composition analysis

[0108] 1) The analytical data of typical components in medical waste are shown in Table 1 below:

[0109] Table 1:

[0110]

[0111] 2) Material data is based on medical waste analysis data from a certain region in China:

[0112] Table 2: Physicochemical Properties of Medical Waste

[0113]

[0114] Table 3: Composition of Medical Waste

[0115]

[0116] Table 4: Industrial and Elemental Analysis of Medical Waste

[0117]

[0118] Example 1

[0119] like Figure 1 As shown, Example 1 provides a plasma treatment system for treating medical waste and recovering hydrogen, which includes a pretreatment and feeding system 0, a silo 1, a plasma gasification furnace 2, a waste heat boiler 6, a semi-dry deacidification quench tower 7, a bag filter 8, a cooler 9, a purification desulfurization tower 10, a Roots blower 11, a gas storage tank 12, a compressor 13, a PSA-TSA hydrogen purification device 14, and a hydrogen storage tank 15, all connected in sequence.

[0120] Among them, a plasma generator 4 is provided in the lower middle part of the plasma gasification furnace 2 body;

[0121] The lower part of the plasma gasification furnace 2 is equipped with a slag pool 5;

[0122] The plasma generator 4 is connected to the air compressor 3.

[0123] 1. Pre-treatment and feeding system

[0124] Medical waste is fed into the integrated crushing and high-temperature waste treatment machine by an elevator. The machine consists of a main body, a sealing door, a stirring mechanism, a crushing mechanism, a piping system, and a control system (not shown in the figure). The main body is a stainless steel circular vertical structure. Specific structural parameters are shown in Table 5.

[0125] Table 5: Main Parameters of the Pretreatment and Feeding System

[0126]

[0127] 2. Plasma gasification furnace, air compressor, cooling water and slag pool

[0128] The plasma gasification furnace includes a furnace body and a plasma generator disposed within the furnace body. The furnace body is used to receive the residue that has not been completely pyrolyzed and gasified in the gasification furnace. The plasma generator is used to heat the residue, decompose the organic matter in the residue to produce flue gas and crude syngas, and melt the inorganic matter in the residue into liquid glassy slag. The glassy slag is discharged into a slag pool.

[0129] The plasma gasifier is a vertical fixed-bed atmospheric pressure gasifier. Its main components include: a furnace body made of rolled steel plate, lined with refractory material that is acid-resistant, wear-resistant, high-temperature resistant, and resistant to alternating temperature stress; a feed inlet, temperature measuring points, combustion gas inlet, waste liquid injection port, and observation port inside the furnace. The furnace body adopts a cylindrical structure, with an outer shell made of steel plate and lined with lightweight refractory insulation material, effectively reducing heat transfer from the furnace. The inner wall is constructed with high-temperature and corrosion-resistant material, allowing for long-term reliable operation at high temperatures. The plasma gasifier dimensions are φ1700×6500mm.

[0130] The material is gasified and cracked, remaining at the gas outlet for at least 2 seconds. Therefore, the organic components of the waste have sufficient energy and reaction time in the melting furnace to completely gasify and crack into small molecules to form combustible syngas (CO, H2, etc.). The temperature in the reaction zone inside the furnace is above 1200℃, and the gas inside the furnace is reducing, thus avoiding the reaction zone that produces dioxins at the source.

[0131] The main parameters of the plasma gasification furnace are shown in Table 6 below.

[0132] Table 6: Main parameters of the plasma gasification furnace

[0133]

[0134] Example 1:

[0135]

[0136] 3. Waste heat boiler

[0137] This system employs a horizontally mounted heat exchange boiler. The waste heat boiler recovers heat from the high-temperature syngas while simultaneously cooling the flue gas, reducing the syngas temperature from 1000℃ to approximately 500℃. The produced superheated steam can be used for high-temperature sterilization and drying processes in the pretreatment of medical waste.

[0138] Table 7: Parameters of Waste Heat Boiler

[0139]

[0140] 4. Exhaust gas treatment system

[0141] The exhaust gas treatment system uses a semi-dry desulfurization quench tower + bag filter + cooler + purification desulfurization tower.

[0142] (1) Semi-dry deacidification quenching tower

[0143] The quench tower consists of a tower body, a two-fluid spray system, and a water supply system (not shown in the figure), and includes a device for preparing and supplying the acid-base removal solution. The quench tower is mainly used to remove acidic gaseous pollutants from syngas; the inlet syngas temperature is 500℃, and the outlet temperature is <200℃. Most of the acidic substances in the flue gas are removed by spraying NaHCO3 solution.

[0144] Under the action of compressed air, the slurry is atomized by the atomizing nozzle. Its structure is a double-layered jacketed pipe. The absorbent slurry goes through the inner pipe and the compressed air goes through the outer pipe. The slurry and compressed air are strongly mixed at the nozzle and then sprayed out from the atomizer nozzle, so that the slurry is atomized into fine particles and fully contacted with the gas for absorption.

[0145] The apparatus for preparing and supplying the deacidification and alkali solutions includes an intermediate storage tank and conveying equipment. In the NaHCO3 solution preparation tank, water is added and stirred to prepare a solution of a certain concentration. The solution is then pumped to the atomizer nozzle (not shown in the figure), where compressed air simultaneously atomizes the solution. Two alkali solution tanks are provided, one for preparation and one for supply, operating alternately. The alkali solution preparation tank is equipped with a stirrer and an electric heater.

[0146] To prevent the quench tower from being corroded by acidic gases, it adopts a double-layer structure inside, and the surface in contact with the flue gas is made of corrosion-resistant, high-temperature resistant and fire-resistant material.

[0147] Table 8: Parameters of Semi-dry Deacidification Quenching Tower

[0148]

[0149] (2) Baghouse dust collector

[0150] The dust collector uses a conventional bag filter, and the entire system consists of a bag filter, a pulse jet cleaning system, piping, and control instruments (not shown in the diagram). The syngas exiting the semi-dry deacidification quench tower is cooled to 180℃ before entering the bag filter. The syngas enters from the outside of the filter bags and exits from the top of the hopper. Most of the fly ash and particulate matter adheres to the surface of the filter bags. The fly ash adhering to the outer surface of the filter bags is then back-flushed into the dust collector's ash hopper by compressed air. The bag filter is cleaned using pulse jet cleaning, which can be performed online or offline.

[0151] Table 9: Parameters of Baghouse Dust Collectors

[0152]

[0153] (3) Cooler

[0154] The cooler uses a shell-and-tube heat exchanger, in which the synthesis gas and cooling water flow counter-currently to cool and exchange heat, reducing the temperature of the synthesis gas from 180°C to 50°C. The gas enters the shell side, and the cooling water enters the tube side. The cooling water is a closed-loop cooling water system.

[0155] Table 10: Main Parameters of the Cooler

Claims

1. A plasma processing system for medical waste treatment and recycling of hydrogen gas, characterized by, It comprises a pre-treatment and feeding system, a bunker, a plasma gasification furnace, a waste heat boiler, an ash and slag collecting system, a tail gas treatment system, a hydrogen recovery system and a public auxiliary system connected in sequence. The middle and lower part of the body of the plasma gasification furnace is provided with a plasma generator.

2. The plasma processing system for medical waste treatment and recycling hydrogen gas of claim 1, wherein, The plasma treatment system for medical waste treatment and hydrogen recovery meets one or more of the following conditions: (1) The pre-treatment and feeding system comprises a crushing and high-temperature waste all-in-one machine, which is composed of a main body, a sealing door, a stirring mechanism, a crushing mechanism, a pipeline system and a control system; (2) The ash and slag collecting system comprises a slag pool; (3) The tail gas treatment system comprises a semi-dry deacidification and quenching tower, a bag-type dust collector, a cooler and a purification and desulfurization tower; (4) The hydrogen recovery system comprises a Roots blower, a gas storage tank, a compressor, a PSA-TSA hydrogen purification device and a hydrogen storage tank; and (5) The public auxiliary system comprises a steam boiler, a compressed air system, a nitrogen making system and a soft water system.

3. The plasma processing system for medical waste treatment and recycling hydrogen gas of claim 1, wherein, The plasma treatment system for medical waste treatment and hydrogen recovery meets one or more of the following conditions: (1) The plasma gasification furnace is an adiabatic reactor, (2) The plasma gasification furnace is in the form of a vertical fixed-bed atmospheric gasification furnace; (3) The components of the plasma gasification furnace include a furnace body, an inner lining feed port, temperature measuring points, a combustion gas port, a waste liquid injection port and an observation port; (4) The material of the inner wall of the plasma gasification furnace is preferably a refractory material, further preferably a lightweight refractory insulation material, more preferably a refractory lightweight insulation material resistant to acid, wear, high temperature and alternating temperature stress; (5) The material of the furnace body of the plasma gasification furnace is steel; (6) The furnace body of the plasma gasification furnace adopts a cylindrical structure; (7) The size of the plasma gasification furnace is φ1700×6500mm; (8) The middle and lower part of the plasma gasification furnace is provided with six 200 kW plasma generators, and further can have four gasification lances; (9) The lower part of the body of the plasma gasification furnace is a slag discharge nipple, which is provided with a desalted water cooling device and its lower part is inserted into the slag pool; Preferably, a slag discharge burner is arranged between the body and the slag discharge nipple of the plasma gasification furnace, and the fuel used by the burner is preferably natural gas; the burner is cooled by air compressed by an air compressor; (10) The plasma generator adopts a water-cooled non-transferred arc mode; (11) The plasma generator is connected with a compressed air system or a separately arranged air compressor; (12) The plasma generator is provided with an on-off pneumatic ball valve, a pressure stabilizing and reducing valve and a pressure switch; (13) The plasma generator adopts a water-cooled generator electrode; (14) The plasma generator is connected with a cooling water system, which is preferably a closed circulation cooling water system, and the closed circulation cooling water system is composed of a water tank, two pipeline booster water pumps, a heat exchanger, related instruments and a control cabinet; and (15) The plasma generator uses a high-power direct-current stabilized power supply, for example, an IGBT tube high-frequency inverter switch direct-current power supply.

4. The plasma processing system for medical waste treatment and recycling hydrogen gas of claim 1, wherein, The plasma treatment system for medical waste treatment and hydrogen recovery meets one or both of the following conditions: (1) The waste heat boiler adopts a horizontal heat exchange boiler; And (2) the outlet of the waste heat boiler is located at the bottom of the waste heat boiler.

5. The plasma processing system for medical waste disposal and recycling hydrogen gas as claimed in claim 2 wherein, The plasma treatment system for medical waste treatment and hydrogen recovery meets one or more of the following conditions: (1) The semi-dry deacidification rapid cooling tower is provided with an alkali liquor atomizing lance; the alkali liquor atomizing lance is connected with an alkali liquor tank, and the alkali liquor tank is provided with a valve; (2) The inlet of the semi-dry deacidification rapid cooling tower is located at the bottom of the semi-dry deacidification rapid cooling tower, and the outlet of the semi-dry deacidification rapid cooling tower is located at the top of the semi-dry deacidification rapid cooling tower; (3) The outlet of the waste heat boiler is connected with the inlet of the semi-dry deacidification rapid cooling tower; (4) The inlet of the bag-type dust collector is located at the top of the bag-type dust collector; (5) The bag-type dust collector is provided with an external heat preservation device, and a bottom ash collecting bin is arranged at the bottom of the bag-type dust collector; (6) The cooler is a shell-and-tube cooler; (7) The inlet of the cooler is located at the top of the cooler, and the outlet of the cooler is located at the bottom of the cooler; (8) The outlet of the cooler is provided with a gas-liquid separator; (9) The inlet of the purification desulfurization tower is located at the bottom of the purification desulfurization tower, and the outlet of the purification desulfurization tower is located at the top of the purification desulfurization tower; (10) The outlet of the cooler is connected with the inlet of the purification desulfurization tower; (11) The purification desulfurization tower is provided with a drying layer, an activated carbon adsorption layer and a desulfurization layer; (12) The outlet of the purification desulfurization tower is connected with a gas storage tank through a Roots blower; (13) The gas storage tank is connected with the PSA-TSA hydrogen purification device through a compressor; (14) The upper part of the PSA-TSA hydrogen purification device is provided with a waste gas discharge device, and the lower part is provided with an outlet; And (15) The outlet of the PSA-TSA hydrogen purification device is connected with a hydrogen storage tank.

6. The plasma treatment system for medical waste treatment and hydrogen recovery according to claim 1, comprising, in sequence, a pretreatment and feeding system, a stock bin, a plasma gasification furnace, a waste heat boiler, a semi-dry deacidification rapid cooling tower, a bag-type dust collector, a cooler, a purification desulfurization tower, a Roots blower, a gas storage tank, a compressor, a PSA-TSA hydrogen purification device and a hydrogen storage tank; Wherein, the middle and lower part of the body of the plasma gasification furnace is provided with a plasma generator; the plasma generator is connected with an air compressor; the plasma generator is connected with a cooling water system; and the lower part of the plasma gasification furnace is provided with a slag pool. It is treated by the plasma treatment system for medical waste treatment and hydrogen recovery according to any one of claims 1-6.

7. A plasma treatment method for medical waste treatment and recycling of hydrogen gas, characterized by, The plasma treatment method for medical waste treatment and hydrogen recovery meets one or more of the following conditions:

8. The plasma treatment method for medical waste treatment and recycling hydrogen gas according to claim 7, wherein, (1) The working pressure of the pretreatment and feeding system is -250-3800 Pa; (2) The working temperature of the pretreatment and feeding system is -250-3800 Pa; ​ (3) the outlet temperature of the plasma gasification furnace is 850-1000°C; (4) the melting temperature in the plasma gasification furnace is above 1300°C; (5) The plasma generator single generator gas consumption 70 Nm 3 / h; (6) when the plasma generator adopts a water-cooled generator electrode, the cooling water quality in the water-cooled generator electrode is demineralized water; (7) the inlet temperature of the waste heat boiler is 850-1000°C, for example 1000°C; and (8) the outlet temperature of the waste heat boiler is 400-600°C, for example 500°C.

9. The method for medical waste treatment and recycling hydrogen gas by plasma treatment as claimed in claim 7, wherein, The plasma treatment method for medical waste treatment and hydrogen recovery meets one or more of the following conditions: (1) the inlet temperature of the semi-dry deacidification quench tower in the tail gas treatment system is 400-600°C, for example 500°C; (2) the outlet temperature of the semi-dry deacidification quench tower in the tail gas treatment system is 170-190°C, for example 180°C; (3) the gas flow rate in the semi-dry deacidification quench tower in the tail gas treatment system is 1-1.5 m / s, for example 1.2 m / s; (4) the quenching time in the semi-dry deacidification quench tower in the tail gas treatment system is less than 1s; (5) the semi-dry deacidification quench tower in the tail gas treatment system contains an alkali solution, which is preferably a sodium bicarbonate solution; (6) the inlet temperature of the bag filter in the tail gas treatment system is 170-190°C, for example 180°C; (7) the outlet temperature of the bag filter in the tail gas treatment system is 170-190°C, for example 180°C; (8) the filtration accuracy of the bag filter in the tail gas treatment system is 0.08-0.12μm, for example 0.1μm; (9) the inlet temperature of the cooler in the tail gas treatment system is 170-190°C, for example 180°C; (10) the outlet temperature of the cooler in the tail gas treatment system is 40-60°C, for example 50°C; (11) the cooling water inlet pressure of the cooler in the tail gas treatment system is 0.4-0.6 MPa, for example 0.4 MPa; (12) the cooling water return pressure of the cooler in the tail gas treatment system is 0.1-0.3 MPa, for example 0.2 MPa; and (13) the heat exchange area of the cooler in the tail gas treatment system is 3-5 m 2 , for example 4 m 2 .

10. The method for medical waste treatment and recycling hydrogen gas by plasma treatment as claimed in claim 7, wherein, The plasma treatment method for medical waste treatment and hydrogen recovery meets one or more of the following conditions: (1) the Roots blower in the hydrogen recovery system pressurizes the purified synthesis gas to 40-60KPa, for example 50 KPa; and (2) the compressor in the hydrogen recovery system pressurizes the purified synthesis gas to 1.0-3.0MPa, for example 2.0MPa.

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