Thermal plasma torch solid waste incineration power generation system and incineration power generation method

Abstract

The present invention provides a thermal plasma torch solid waste incineration power generation system, comprising: a thermal plasma torch incinerator, a flue gas incineration chamber, a folding plate dust collector, a flue gas waste heat utilization unit and a flue gas post-treatment unit connected in sequence; the thermal plasma torch incinerator is composed of a plurality of furnace bodies in cascade, and the adjacent furnace bodies are internally connected; a plurality of thermal plasma torches are arranged in the furnace body, and a stirring assembly is arranged at the bottom of the furnace body; a plurality of flue thermal plasma torches are arranged in the flue gas incineration chamber to incinerate and remove tar and organic matter in the flue gas; the incinerator thermal plasma torch and the flue thermal plasma torch are both high-frequency and high-voltage AC thermal plasma torches. The thermal plasma torch solid waste incineration power generation application system of the present invention not only realizes the incineration treatment of solid waste without adding auxiliary fossil fuels, saves costs, operates stably, and achieves environmentally friendly emission standards, but also can realize the power generation utilization of waste heat resources.

Description

Technical Field

[0001] The present invention relates to the technical field of solid waste incineration power generation, and in particular to a thermal plasma torch solid waste incineration power generation system and an incineration power generation method. Background Art

[0002] Solid waste refers to solid and semi-solid waste materials that pollute the environment and are generated by human production, construction, daily life and other activities and cannot be used at a certain time and place and are discarded. Based on the main types of solid waste, the solid waste treatment industry is mainly divided into six sub-sectors, including domestic waste treatment industry, agricultural and forestry waste treatment industry, restaurant kitchen waste treatment industry, industrial solid waste treatment industry, sludge treatment industry, and hazardous waste treatment industry.

[0003] The most common methods of solid waste treatment are landfill, incineration and comprehensive utilization. Incineration can quickly and significantly reduce the volume of combustible waste, completely eliminate harmful bacteria and viruses, destroy toxic organic matter, and recover the heat energy generated by combustion. Therefore, incineration is a more reasonable and superior technical route, and has become the main treatment measure for solid waste that is difficult to reuse.

[0004] From the perspective of fuel, only when the calorific value of combustion reaches a certain value can the investment in equipment and energy be profitable. When the calorific value of garbage is >5000kj / kg, the combustion is stable and the combustion effect is good; when the calorific value is ≤3344kj / kg, the combustion is unstable, and fuel oil is needed to assist combustion. At present, it is generally believed in the industry that garbage incineration power plants (medium and high parameters) can only be profitable when they reach a certain scale, and the garbage treatment scale of 600 tons / day is a critical point. Considering the power generation income, one-time investment cost, operation and maintenance costs, garbage incineration (medium parameters) power generation projects below 300 tons / day are not very feasible, that is, the conventional fluidized bed incineration or grate furnace incineration power generation technology for urban domestic garbage below 300 tons / day is not only economically unfeasible, but also to achieve stable operation and VOCs emission compliance, it is necessary to supplement fuel oil, gas or other fuels, so the operation and maintenance costs are high, which seriously limits the application of incineration treatment methods in small and medium-sized garbage treatment. In addition, DC high-power plasma melting and power generation technology is not economical for the treatment of small-tonnage solid waste and urban domestic waste below 300 tons / day.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The first purpose of the present invention is to provide a thermal plasma torch solid waste incineration power generation system, which uses a thermal plasma torch to incinerate solid waste, thereby eliminating the need to add auxiliary fossil fuels, saving costs, operating stably, and achieving environmentally friendly emission standards.

[0007] The second purpose of the present invention is to provide an incineration power generation method using the above-mentioned system, which realizes the power generation utilization of waste heat resources in the incineration process of small-tonnage solid waste (such as domestic garbage, medical waste, oilfield sludge, industrial hazardous waste, etc.), with high efficiency and low operation and maintenance costs.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0009] The present invention provides a thermal plasma torch solid waste incineration power generation system, comprising:

[0010] A thermal plasma torch incinerator, a flue gas incineration chamber, a folded plate dust collector, a flue gas waste heat utilization unit and a flue gas post-treatment unit connected in sequence;

[0011] The thermal plasma torch incinerator is composed of a plurality of furnace bodies in cascade, and the interiors of adjacent furnace bodies are connected; a plurality of incinerator thermal plasma torches are arranged in the furnace body, and a stirring assembly is arranged at the bottom of the furnace body;

[0012] The flue gas incineration chamber is provided with a plurality of flue thermal plasma torches to burn and remove tar and organic matter present in the flue gas;

[0013] The incinerator thermal plasma torch and the flue thermal plasma torch are both high-frequency and high-voltage AC thermal plasma torches;

[0014] The flue gas waste heat utilization unit includes a waste heat boiler; the waste heat boiler includes an economizer, a circulating pump, an evaporator, a steam drum, a superheater and a generator set connected in sequence; a condenser and a deaerator are connected in sequence at the exhaust steam outlet of the generator set, and the deaerator is connected to the inlet of the economizer; the generator set is a screw expander generator set or a steam turbine generator set;

[0015] A first heat exchange tube is coiled in the interlayer of the side wall of the thermal plasma torch incinerator, one end of the first heat exchange tube passes through the side wall of the thermal plasma torch incinerator to be provided with a first softened water inlet, and the other end passes through the side wall of the thermal plasma torch incinerator to be connected to the circulation pump;

[0016] A second heat exchange tube is coiled in the interlayer of the side wall of the flue gas incineration chamber, one end of the second heat exchange tube passes through the side wall of the flue gas incineration chamber to be provided with a second softened water inlet, and the other end passes through the side wall of the flue gas incineration chamber to be connected to the circulation pump;

[0017] A third heat exchange tube is arranged in the folding plate dust removal chamber, one end of the third heat exchange tube passes through the folding plate dust collector and is connected to a third softened water inlet, and the other end is connected to the circulation pump.

[0018] In the existing technology, when conventional fluidized bed incineration or grate furnace incineration power generation technology is used to treat urban domestic waste below 300 tons / day, since its calorific value is ≤3344kj / kg, the combustion is unstable and fuel oil needs to be added to assist combustion, which greatly increases the cost of waste treatment and lacks economic feasibility.

[0019] In order to solve the above technical problems, the present invention provides a thermal plasma torch solid waste incineration power generation system. The treatment system is provided with a thermal plasma torch incinerator composed of a plurality of cascaded furnace bodies, and the cascade number of the thermal plasma torch incinerator can be designed according to the solid waste treatment amount; by providing a thermal plasma torch flue gas incineration chamber, tar and organic matter in the flue gas can be removed, which is conducive to the compliance of flue gas emissions; solid waste is decomposed by high-temperature combustion of a plurality of thermal plasma torches arranged in the thermal plasma torch incinerator, without the need to add auxiliary fossil fuels, which can save costs and ensure compliance with emissions, and the thermal plasma torch uses electrical energy and is controlled by PLC-DCS linkage, so it has stable operation, high degree of automation and safety performance.

[0020] The thermal plasma torch incinerator of the present invention adopts a distributed structure, which can well avoid the problem of coking during the incineration process, and even if coking is generated during long-term use, it is easy to deal with. In addition, the provision of a flue gas incineration chamber can fully burn or crack organic matter in the flue gas, thereby avoiding boiler coking, thereby ensuring the overall reliable operation of the system.

[0021] The present invention mainly utilizes two parts of waste heat when generating electricity. One is the radiation heat exchange energy in the thermal plasma incineration zone; the other is the convection heat exchange energy in the flue. Specifically, by setting the first heat exchange tube and the second heat exchange tube, the radiation heat exchange energy of the thermal plasma torch incinerator and the flue gas incineration chamber can be fully utilized, and the waste heat boiler and the third heat exchange tube can be used for convection heat exchange with the flue gas, so as to fully utilize the heat energy in the flue gas.

[0022] The selection of specific generator sets can be calculated based on the actual processing tonnage and calorific value. For example, a screw expander generator set can be used for daily processing of 30 to 150 tons of domestic waste. For daily processing of more than 10 tons of industrial solid waste, oilfield sludge, and medical waste with a higher combustible value, a screw expander generator set or a steam turbine generator set can be selected based on the actual processing tonnage and calorific value.

[0023] Preferably, the furnace body of the thermal plasma torch incinerator is tilted downward from the solid waste feeding end to the slag discharging end, and a flue gas outlet is provided at the top of the furnace body at the feeding end of the thermal plasma torch incinerator, and the flue gas outlet is connected to the flue gas incineration chamber; further, the inclination angle of the furnace body of the thermal plasma torch incinerator is 0-10°. Furthermore, it also includes a hopper for storing solid waste, a screw feeder is provided at the bottom of the hopper, and the outlet of the screw feeder is connected to the furnace body of the thermal plasma torch incinerator. Furthermore, a slag collecting hopper is connected to the bottom of the furnace body at the slag discharging end of the thermal plasma torch incinerator, and a slag discharger is provided at the bottom of the slag collecting hopper. Setting a certain inclination angle facilitates the forward advancement of solid waste and the discharge of slag. When in use, solid waste enters the feed port of the thermal plasma torch incinerator, and is continuously pushed forward and burned from the feed end to the slag discharge end of the thermal plasma torch incinerator under the push of the stirring assembly and the influence of gravity. The generated flue gas returns from the slag discharge end of the thermal plasma torch incinerator to the feed end and is discharged from the flue gas outlet, which is conducive to the full combustion of the flue gas.

[0024] Preferably, the thermal plasma torch is arranged vertically.

[0025] Preferably, the side wall of the furnace body at the feeding end of the thermal plasma torch incinerator is connected to a primary fan, and the side wall of the furnace body at the slag discharge end is connected to a blower. The blower can push the flue gas to flow toward the flue gas outlet, and the blower and the primary fan can provide primary hot air and secondary hot air for the thermal plasma torch incinerator, thereby properly drying the sorted solid waste, which is conducive to the full combustion of the solid waste. The primary hot air and the secondary hot air are both provided by an air preheater arranged in the flue.

[0026] Preferably, the stirring assembly includes a stirring shaft and a stirring rod, and the number of the stirring rods is multiple, the center of the stirring rod is fixed on the stirring shaft, and multiple upward convex teeth are arranged at both ends; the stirring shaft penetrates the bottom wall of the furnace body and is connected to a stepper motor. Furthermore, the stirring rod is parallel to the bottom of the thermal plasma torch incinerator. The stirring rod is parallel to the bottom of the thermal plasma torch incinerator, which is conducive to continuously pushing the solid waste from the feed end of the thermal plasma torch incinerator to the slag discharge end for incineration, and is also conducive to maintaining the good operating state of the stepper motor, and can promote the full combustion of the solid waste by stirring it.

[0027] Preferably, the flue gas waste heat utilization unit further includes a first heat exchange flue and a second heat exchange flue, wherein the first heat exchange flue is connected to the outlet of the folded plate dust collector, and the flue gas after being treated by the folded plate dust collector enters the flue gas post-treatment unit through the first heat exchange flue and the second heat exchange flue in sequence; an air preheater is arranged in the second heat exchange flue. The arrangement of the flue gas waste heat utilization unit can, on the one hand, recycle waste heat in the flue gas through heat exchange, and on the other hand, moderate cooling of the microenvironment is also conducive to the settling of dust in the flue gas.

[0028] Furthermore, the superheater, the evaporator and the economizer are sequentially arranged in the first heat exchange flue along the flue gas flow direction.

[0029] Preferably, the flue gas incineration chamber is connected to a SNCR device for flue gas denitrification.

[0030] Preferably, a secondary hot air inlet is provided on one side of the flue gas combustion chamber, and the secondary hot air inlet is connected to the air preheater. The air preheater provides secondary hot air, which can fully utilize the residual heat in the flue gas.

[0031] Preferably, a plurality of folding plates are arranged in the folding plate dust collector, and the plurality of folding plates are staggered along the flue gas flow direction.

[0032] Preferably, the third heat exchange tube is coiled and arranged on the side of the folding plate facing away from the flue gas flow direction. By arranging the third heat exchange tube on the back of the folding plate, the heat in the flue gas can be fully utilized, and the moderate cooling of the microenvironment is also conducive to the precipitation of dust. In addition, arranging the third heat exchange tube on the back of the folding plate can also moderately avoid the direct impact and friction of dust and particles in the flue gas, which may affect the service life of the folding plate.

[0033] Preferably, the flue gas post-treatment unit comprises a spray tower, a thermal plasma cracker, a cyclone dust collector, a bag dust collector and a chimney connected in sequence; the flue gas is sequentially treated by the spray tower, the thermal plasma cracker, the cyclone dust collector and the bag dust collector and then discharged through the chimney. The addition of a thermal plasma cracker for cracking and treating odor and dioxins in the gas phase tail gas can thoroughly treat VOCs and achieve standard emissions.

[0034] Preferably, an induced draft fan is provided between the bag filter and the chimney.

[0035] Preferably, the flue gas post-treatment unit further comprises an injection assembly; the injection assembly comprises a slaked lime injector and an activated carbon injector, and the outlets of the slaked lime injector and the activated carbon injector are both connected to the flue between the thermal plasma cracker and the cyclone dust collector. By arranging the slaked lime and activated carbon injection, organic matter including dioxins, heavy metals, acidic substances such as sulfur dioxide, etc. can be adsorbed and cleaned, and the flue gas emission can be promoted to meet the standard.

[0036] When treating flue gas, the present invention adopts a flue gas purification process combination of "SNCR+wet method+thermal plasma cracking ionization+slaked lime activated carbon injection+cyclone dust removal+bag dust removal" to control acidic gases, heavy metals, organic pollutants and particulate matter. The emission limit of the flue gas after purification complies with the national GB18485-2014 "Pollution Control Standard for Incineration of Domestic Waste", and can meet the EU 2000 standard limit when the high standard is adopted.

[0037] Preferably, the thermal plasma torches at the top of the thermal plasma torch incinerator are arranged vertically or obliquely to form an array, and the flue thermal plasma torches of the flue gas incineration chamber are oriented horizontally, vertically, obliquely, or in a combination of the two.

[0038] Preferably, dust removal devices are provided at the bottom of the folded plate dust collector, the bottom of the first heat exchange flue, the bottom of the spray tower and the bottom of the bag dust collector.

[0039] Preferably, a garbage leachate combustion and back-spraying device is connected to the top of the thermal plasma torch incinerator. Specifically, the back-spraying pipe of the garbage leachate combustion and back-spraying device is arranged at a suitable position on the top of the thermal plasma torch incinerator. Garbage stacking and treatment will produce a large amount of leachate with complex components and greater harm, with COD>8000mg / L and BOD>5000mg / L, which will pollute surface water and groundwater and must be harmlessly treated. The present invention adopts a garbage leachate combustion and back-spraying device to send it into the thermal plasma torch incinerator for incineration treatment.

[0040] The present invention provides a thermal plasma torch solid waste incineration power generation method, which uses the thermal plasma torch solid waste incineration power generation system to process solid waste and realize waste heat power generation.

[0041] The incineration power generation method of the present invention is simple to operate, has efficient treatment, low operation and maintenance costs, achieves environmentally friendly emission standards, and can fully utilize the heat energy in the incineration process to generate electricity, thereby achieving reasonable utilization of waste resources.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) The thermal plasma torch solid waste incineration power generation system of the present invention is provided with a thermal plasma torch incinerator composed of a plurality of furnace bodies cascaded, and the number of furnace bodies cascaded can be designed according to the actual solid waste incineration processing amount;

[0044] (2) The smoke incineration chamber can be set up to remove tar and organic matter in the smoke, which is conducive to the smoke emission meeting the standards;

[0045] (3) The thermal plasma torch in the thermal plasma torch incinerator decomposes solid waste through high-temperature combustion without the need to add auxiliary fossil fuels, which can save costs and ensure that emissions meet standards. The thermal plasma torch uses electrical energy and is controlled through PLC-DCS linkage to achieve stable operation, high degree of automation and safety performance.

[0046] (4) The flue gas waste heat utilization unit can utilize the radiation heat transfer energy in the incineration area and the convection heat transfer energy in the flue to generate electricity, thereby improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0048] Figure 1 A schematic diagram of the structure of a thermal plasma torch solid waste incineration power generation system provided in an embodiment of the present invention;

[0049] Figure 2 A schematic diagram of the structure of a stirring assembly provided in an embodiment of the present invention;

[0050] Figure 3 A schematic diagram of the structure of a first heat exchange tube provided in an embodiment of the present invention;

[0051] Figure 4 A schematic diagram of the structure of a second heat exchange tube provided in an embodiment of the present invention;

[0052] Figure 5 A schematic structural diagram of a third heat exchange tube provided in an embodiment of the present invention.

[0053] in:

[0054] 1- Hopper; 2- Smoke outlet;

[0055] 3- Flue thermal plasma torch; 4- SNCR device;

[0056] 5-folding plate; 6-third softened water inlet;

[0057] 7-folding plate dust collector; 8-superheater;

[0058] 9-steam drum; 10-evaporator;

[0059] 11- economizer; 12- screw expander;

[0060] 13- generator; 14- condenser;

[0061] 15-deaerator; 16-air preheater;

[0062] 17- spray tower; 18- thermal plasma cracker;

[0063] 19-slaked lime injector; 20-activated carbon injector;

[0064] 21-cyclone dust collector; 22-bag dust collector;

[0065] 23- induced draft fan; 24- chimney;

[0066] 25-secondary hot air inlet; 26-ash discharge device;

[0067] 27- flue gas combustion chamber; 28- first heat exchange flue;

[0068] 29-circulation pump; 30-incinerator thermal plasma torch;

[0069] 31-furnace body; 32-first softened water inlet;

[0070] 33-screw feeder; 34-primary fan;

[0071] 35-stirring assembly; 36-stepping motor;

[0072] 37-second heat exchange flue; 38-slag collecting hopper;

[0073] 39-slag discharger; 40-air blower;

[0074] 41- stirring rod; 42- convex teeth;

[0075] 43- stirring shaft; 44- spray back pipe;

[0076] 45-second softened water inlet; 46-first heat exchange tube;

[0077] 47-third heat exchange tube; 48-second heat exchange tube;

[0078] 49-Thermal plasma torch incinerator. DETAILED DESCRIPTION

[0079] The technical scheme of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but it will be understood by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention. If specific conditions are not specified in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not specified in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0080] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0081] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0082] In order to more clearly explain the technical solution of the present invention, it is described in the form of specific embodiments below.

[0083] Example

[0084] See also Figure 1-5 This embodiment provides a thermal plasma torch solid waste incineration power generation system, including: a hopper 1, a thermal plasma torch incinerator 49, a flue gas incineration chamber 27, a folding plate dust collector 7, a flue gas waste heat utilization unit and a flue gas post-treatment unit connected in sequence; the hopper 1 is used to store solid waste, and a screw feeder 33 is arranged at the bottom.

[0085] like Figure 1As shown, the thermal plasma torch incinerator 49 is composed of a plurality of furnace bodies 31 in cascade, and the adjacent furnace bodies 31 are internally connected; a plurality of incinerator thermal plasma torches 30 are arranged in the furnace body 31, and the incinerator thermal plasma torches 30 are arranged vertically or inclined to form an array. A stirring assembly 35 is also provided at the bottom of the furnace body 31; a flue gas outlet 2 is provided at the top of the furnace body 31 at the feeding end of the thermal plasma torch incinerator 49, and the flue gas outlet 2 is connected to the flue gas combustion chamber 27. The outlet of the screw feeder 33 is connected to the furnace body 31 at the feeding end of the thermal plasma torch incinerator 49. A slag collecting hopper 38 is connected to the bottom of the furnace body 31 at the slag discharge end of the thermal plasma torch incinerator 49, and a slag discharger 39 is provided at the bottom of the slag collecting hopper 38. The furnace body 31 of the thermal plasma torch incinerator 49 is tilted downward from the solid waste feeding end to the slag discharge end. In this embodiment, the inclination angle of the furnace body 31 of the thermal plasma torch incinerator 49 is 0-10°. In actual setting, the furnace body 31 adopts a stainless steel furnace body 31, lined with ceramic fiber refractory material, and uses 316L stainless steel as the kiln liner. It is equipped with multiple sets of thermal plasma torches and driving power supplies. The furnace temperature and other working parameters are set through the PLC touch screen, and the temperature data is collected in real time. The number of cascades of the furnace body 31 is determined by the type and tonnage of solid waste processed daily. In this example, the number of furnace bodies 31 is 4. When in use, solid waste enters the furnace body 31 at the feed end of the thermal plasma torch incinerator 49. Under the push of the stirring component 35 and the influence of gravity, it is continuously promoted from the feed end to the slag discharge end for incineration, and the generated flue gas returns from the slag discharge end to the feed end and is discharged from the flue gas outlet 2, which is conducive to the full incineration of solid waste and flue gas.

[0086] In this embodiment, the structure of the stirring component 35 is as follows: Figure 2 As shown, the stirring assembly 35 includes a stirring shaft 43 and a stirring rod 41. There are multiple stirring rods 41, which are parallel to the bottom of the thermal plasma torch incinerator 49. The center of the stirring rod 41 is fixed on the stirring shaft 43, and multiple upward convex teeth 42 are arranged at both ends; the stirring shaft 43 penetrates the bottom wall of the furnace body 31 and is connected to the stepping motor 36. In this example, there are two stirring rods 41, and the two stirring rods 41 are arranged in a cross shape.

[0087] In order to ensure that the solid waste is fully burned, a primary fan 34 is connected to the side wall of the furnace body at the feeding end of the thermal plasma torch incinerator 49, and a blower 40 is connected to the side wall of the furnace body at the slag discharge end.

[0088] Continue reading Figure 1A plurality of flue thermal plasma torches 3 are arranged in the flue gas incineration chamber 27 to incinerate and remove tar and organic matter in the flue gas. The flue thermal plasma torch 3 is oriented in a horizontal direction, a vertical direction, an inclined direction, or a combination of several of them. In this embodiment, the thermal plasma torch 3 is oriented in a horizontal direction. The incinerator thermal plasma torch 30 and the flue thermal plasma torch 3 used in this embodiment are both high-frequency and high-voltage AC thermal plasma torches.

[0089] The flue gas combustion chamber 27 is connected to a SNCR device 4 on one side for flue gas denitration, and is provided with a secondary hot air inlet 25 on the other side to promote full combustion of the flue gas through the secondary hot air. After being processed in the flue gas combustion chamber 27, the flue gas enters the folded plate dust collector 7.

[0090] A plurality of folding plates 5 are arranged in the folding plate dust collector 7, and the folding plates 5 are arranged alternately along the flow direction of the flue gas. When in use, the flue gas hits the folding plates 5, and the particles, dust, etc. contained therein settle to the bottom of the folding plate dust collector 7. In this embodiment, the folding plates 5 are made of a special ceramic material that is resistant to high temperature and corrosion.

[0091] In this embodiment, the flue gas waste heat utilization unit includes a first heat exchange flue 28, a second heat exchange flue 37 and a waste heat boiler. The first heat exchange flue 28 is connected to the outlet of the folded plate dust collector 7. After being treated by the folded plate dust collector 7, the flue gas enters the flue gas post-treatment unit through the first heat exchange flue 28 and the second heat exchange flue 37 in sequence; an air preheater 16 is arranged in the second heat exchange flue 37. The outlet of the air preheater 16 is respectively connected to the secondary hot air inlet 25, the primary fan 34 and the blower 40 to provide primary hot air and secondary hot air therefor.

[0092] Among them, the waste heat boiler includes an economizer 11, a circulating pump 29, an evaporator 10, a steam drum 9, a superheater 8 and a generator set connected in sequence; the exhaust steam outlet of the generator set is connected in sequence with a condenser 14 and a deaerator 15, and the deaerator 15 is connected to the inlet of the economizer 11; the superheater 8, the evaporator 10 and the economizer 11 are arranged in the first heat exchange flue 28 in the direction of flue gas flow; the generator set can be a screw expander generator set or a steam turbine generator set. The selection of a specific generator set can be calculated based on the actual processing tonnage and calorific value. For example, a screw expander generator set can be used for daily processing of 30 tons to 150 tons of domestic waste, and for daily processing of more than 10 tons of industrial solid waste, oilfield sludge, and medical waste with a higher combustible value, a screw expander generator set or a steam turbine generator set can be selected based on the actual processing tonnage and calorific value. The present embodiment uses a screw expander generator set, which is composed of a screw expander 12 and a generator 13.

[0093] In order to make full use of the waste heat, a first heat exchange tube 46 is coiled in the interlayer of the side wall of the thermal plasma torch incinerator 49, and a second heat exchange tube 48 is coiled in the interlayer of the side wall of the flue gas incineration chamber 27; a third heat exchange tube 47 is arranged in the folded plate dust removal chamber 7, and the third heat exchange tube 47 is coiled on the side of the folded plate 5 facing away from the flue gas flow direction. Among them, one end of the first heat exchange tube 46 passes through the side wall of the thermal plasma torch incinerator 49 and is provided with a first softened water inlet 32, and the other end passes through the side wall of the thermal plasma torch incinerator 49 and is connected to the circulation pump 29. One end of the second heat exchange tube 48 passes through the side wall of the flue gas incineration chamber 27 and is provided with a second softened water inlet 45, and the other end passes through the side wall of the flue gas incineration chamber 27 and is connected to the circulation pump 29. One end of the third heat exchange tube 47 passes through the folded plate dust collector 7 and is connected to the third softened water inlet 6, and the other end is connected to the circulation pump 29.

[0094] In this embodiment, the flue gas post-treatment unit includes a spray tower 17, a thermal plasma cracker 18, a cyclone dust collector 21, a bag dust collector 22, an induced draft fan 23 and a chimney 24 which are connected in sequence; the flue gas is processed by the spray tower 17, the thermal plasma cracker 18, the cyclone dust collector 21 and the bag dust collector 22 in sequence and then discharged through the chimney 24.

[0095] The flue gas post-treatment unit also includes an injection assembly; the injection assembly includes a slaked lime injector 19 and an activated carbon injector 20, and the outlets of the slaked lime injector 19 and the activated carbon injector 20 are both connected to the flue between the thermal plasma cracker 18 and the cyclone dust collector 21. By arranging the slaked lime and activated carbon injection, organic matter including dioxins, heavy metals, acidic substances such as sulfur dioxide, etc. can be adsorbed and cleaned, and the flue gas can be discharged up to standard.

[0096] To facilitate the discharge of dust and particulate matter in the flue gas, dust discharge devices 26 are provided at the bottom of the folded plate dust collector 7 , the bottom of the first heat exchange flue 28 , the bottom of the spray tower 17 and the bottom of the bag dust collector 22 .

[0097] In order to make the flue and heat exchange tubes resistant to high temperature and corrosion, nano-ceramic spraying treatment is adopted.

[0098] Garbage stacking and treatment will produce a large amount of leachate with complex components and great harm. In order to treat this leachate, a garbage leachate combustion and back-spraying device is also provided in this embodiment. The back-spraying pipe 44 of the garbage leachate combustion and back-spraying device is arranged at a suitable position on the top of the thermal plasma torch incinerator 49.

[0099] In summary, the thermal plasma torch solid waste incineration power generation system of the present invention uses a thermal plasma torch to incinerate garbage, thereby eliminating the need to add auxiliary fossil fuels, saving costs, operating stably, achieving environmentally friendly emissions, and fully utilizing the waste heat resources generated during the solid waste incineration process.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thermal plasma torch solid waste incineration power generation system, characterized in that: include: A thermal plasma torch incinerator, a flue gas incineration chamber, a folded plate dust collector, a flue gas waste heat utilization unit and a flue gas post-treatment unit connected in sequence; The thermal plasma torch incinerator is composed of a plurality of furnace bodies in cascade, and the interiors of adjacent furnace bodies are connected; a plurality of incinerator thermal plasma torches are arranged in the furnace body, and a stirring assembly is arranged at the bottom of the furnace body; The flue gas incineration chamber is provided with a plurality of flue thermal plasma torches to burn and remove tar and organic matter present in the flue gas; The incinerator thermal plasma torch and the flue thermal plasma torch are both high-frequency and high-voltage AC thermal plasma torches; The flue gas waste heat utilization unit includes a waste heat boiler; the waste heat boiler includes an economizer, a circulating pump, an evaporator, a steam drum, a superheater and a generator set connected in sequence; a condenser and a deaerator are connected in sequence at the exhaust steam outlet of the generator set, and the deaerator is connected to the inlet of the economizer; the generator set is a screw expander generator set or a steam turbine generator set; A first heat exchange tube is coiled in the interlayer of the side wall of the thermal plasma torch incinerator, one end of the first heat exchange tube passes through the side wall of the thermal plasma torch incinerator to be provided with a first softened water inlet, and the other end passes through the side wall of the thermal plasma torch incinerator to be connected to the circulation pump; A second heat exchange tube is coiled in the interlayer of the side wall of the flue gas incineration chamber, one end of the second heat exchange tube passes through the side wall of the flue gas incineration chamber to be provided with a second softened water inlet, and the other end passes through the side wall of the flue gas incineration chamber to be connected to the circulation pump; A third heat exchange tube is arranged in the folded plate dust removal chamber, one end of the third heat exchange tube passes through the folded plate dust collector and is connected to a third softened water inlet, and the other end is connected to the circulation pump; The furnace body of the thermal plasma torch incinerator is inclined downward from the solid waste feeding end to the slag discharging end, and a smoke outlet is provided on the top of the furnace body located at the feeding end of the thermal plasma torch incinerator, and the smoke outlet is connected to the smoke incineration chamber; The stirring assembly comprises a stirring shaft and a stirring rod, wherein the number of the stirring rods is multiple, the center of the stirring rod is fixed on the stirring shaft, and multiple upward convex teeth are arranged at both ends; the stirring shaft penetrates the bottom wall of the furnace body and is connected to a stepping motor; the stirring rod is parallel to the bottom of the thermal plasma torch incinerator; A plurality of folded plates are arranged in the folded plate dust collector, and the plurality of folded plates are staggered along the flow direction of the flue gas; the third heat exchange tube is coiled and arranged on the side of the folded plate facing away from the flow direction of the flue gas.

2. The thermal plasma torch solid waste incineration power generation system according to claim 1, characterized in that: The side wall of the furnace body at the feeding end of the thermal plasma torch incinerator is connected to a primary fan, and the side wall of the furnace body at the slag discharge end is connected to a blower.

3. The thermal plasma torch solid waste incineration power generation system according to claim 2, characterized in that: The inclination angle of the furnace body of the thermal plasma torch incinerator is 0-10°.

4. The thermal plasma torch solid waste incineration power generation system according to claim 2, characterized in that: The bottom of the furnace body at the slag discharge end of the thermal plasma torch incinerator is connected to a slag collecting hopper, and a slag discharger is arranged at the bottom of the slag collecting hopper.

5. The thermal plasma torch solid waste incineration power generation system according to claim 1, characterized in that: The flue gas waste heat utilization unit also includes a first heat exchange flue and a second heat exchange flue. The first heat exchange flue is connected to the outlet of the folding plate dust collector. After being treated by the folding plate dust collector, the flue gas enters the flue gas post-treatment unit through the first heat exchange flue and the second heat exchange flue in sequence; an air preheater is arranged in the second heat exchange flue.

6. The thermal plasma torch solid waste incineration power generation system according to claim 5, characterized in that: The superheater, the evaporator and the economizer are arranged in sequence in the first heat exchange flue along the flue gas flow direction.

7. The thermal plasma torch solid waste incineration power generation system according to claim 1, characterized in that: The flue gas incineration chamber is connected to a SNCR device for flue gas denitrification.

8. The thermal plasma torch solid waste incineration power generation system according to claim 5, characterized in that: A secondary hot air inlet is arranged on one side of the flue gas combustion chamber, and the secondary hot air inlet is connected to the air preheater.

9. The thermal plasma torch solid waste incineration power generation system according to claim 1, characterized in that: The flue gas post-treatment unit comprises a spray tower, a thermal plasma cracker, a cyclone dust collector, a bag dust collector and a chimney which are connected in sequence; the flue gas is sequentially treated by the spray tower, the thermal plasma cracker, the cyclone dust collector and the bag dust collector and then discharged through the chimney.

10. The thermal plasma torch solid waste incineration power generation system according to claim 9, characterized in that: An induced draft fan is arranged between the bag filter and the chimney.

11. The thermal plasma torch solid waste incineration power generation system according to claim 9, characterized in that: The flue gas post-treatment unit also includes an injection assembly; the injection assembly includes a slaked lime injector and an activated carbon injector, and the outlets of the slaked lime injector and the activated carbon injector are both connected to the flue between the thermal plasma cracker and the cyclone dust collector.

12. A method for generating electricity by incinerating solid waste using a thermal plasma torch, characterized in that: The thermal plasma torch solid waste incineration power generation system according to any one of claims 1 to 11 is used to incinerate solid waste and utilize waste heat for power generation.

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