System for preparing fuel oil through organic solid waste heat carrier pyrolysis

Abstract

The invention relates to the technical field of organic solid waste resourceful treatment, in particular to a system for preparing fuel oil through organic solid waste heat carrier pyrolysis, which comprises a sealed feeding unit, a thin-layer gasification pyrolyzer, a particle heat carrier, a heat carrier lifting unit and a heating unit, the heating unit is used for heating the heat storage plate; the heat carrier lifting unit is used for conveying a plurality of particle heat carriers into a heat storage disc plate of the thin-layer gasification pyrolyzer, the heat storage disc plate is provided with a material falling channel, and after organic solid waste is subjected to double direct contact heating through the heat storage disc plate and the heat carriers to achieve thin-layer gasification pyrolysis, the organic solid waste is shifted into the material falling channel through a material shifting assembly to be output. According to the whole system, organic solid waste is pyrolyzed in a double direct contact heat exchange mode of the heat storage disc plate and the heat carrier, the heat transfer efficiency and the pyrolysis efficiency in the pyrolysis process are greatly improved, and the yield and the quality of pyrolysis oil are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of organic solid waste resource treatment, and in particular to a system for preparing fuel oil by pyrolysis of an organic solid waste heat carrier. Background Art

[0002] Organic solid waste refers to solid and semi-solid organic waste materials generated by humans in production, consumption, life and other activities. The recycling and regeneration of organic solid waste is a low-carbon, clean and sustainable recycling method, and it is also an effective way to further improve the resource recycling of organic solid waste. Organic solid waste is usually pyrolyzed by pyrolysis. Pyrolysis refers to the thermochemical conversion technology of heating organic solid waste under oxygen-deficient or limited oxygen conditions to decompose organic macromolecules into smaller molecular fuel substances (pyrolysis liquid, pyrolysis gas, carbon residue) through thermochemical reactions, so that they are converted into useful fuels or chemical raw materials.

[0003] Currently, existing pyrolysis of organic solid waste typically uses indirect flue gas heating to provide heat for pyrolysis. However, using flue gas to pyrolyze organic solid waste suffers from low heat transfer efficiency, resulting in incomplete pyrolysis of the organic solid waste or excessive energy consumption. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, one of the purposes of the present invention is to provide a system for preparing fuel oil by pyrolysis of organic solid waste heat carrier, which aims to solve the technical problem that the existing pyrolysis of organic solid waste usually adopts indirect heating by flue gas, has low heat transfer efficiency, and leads to insufficient pyrolysis of organic solid waste.

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

[0006] A system for preparing fuel oil by pyrolysis of an organic solid waste heat carrier comprises a sealed feeding unit, a thin-layer gasification pyrolyzer, a granular heat carrier, a heat carrier lifting unit and a heating unit, wherein the thin-layer gasification pyrolyzer comprises a vertical furnace body, a multi-layer heat storage disc and a material shifting assembly, wherein the multi-layer heat storage disc is arranged in the furnace body at intervals along the axial direction of the furnace body; a feeding port, a discharging port and a pyrolysis gas outlet are provided on the furnace body, and the discharging end of the sealed feeding unit is sealedly connected to the feeding port for sealingly conveying the organic solid waste to be processed into the top layer of the heat storage disc; a blanking channel is provided on each layer of the heat storage disc, and each blanking channel is staggered; the material shifting assembly comprises a power unit, a rotating shaft and a multi-layer material shifting member, wherein the rotating shaft is rotatably arranged in the furnace body, and the rotating shaft extends along the axial direction of the furnace body; the The power unit is arranged outside the furnace body and is used to drive the rotating shaft to rotate; multiple layers of the material-diverting members are arranged on the rotating shaft at intervals along the axial direction of the rotating shaft, and the material-diverting members of each layer are located above the heat storage discs of each layer; the material-diverting members of each layer are used to evenly spread the organic solid waste on each layer of the heat storage discs to form a thin layer of material, and to divert the organic solid waste on each layer of the heat storage discs from each material-dropping channel; the heat carrier lifting unit is used to transport multiple granular heat carriers into the heat storage disc located on the top layer, and the granular heat carriers are mixed with the organic solid waste on the heat storage disc; the heating unit is connected to the furnace body and is used to heat the multiple heat storage discs, and the pyrolysis gas and tailings generated after the pyrolysis of the organic solid waste are discharged from the pyrolysis gas outlet and the discharge port respectively.

[0007] Furthermore, the heating unit is independently arranged and not connected to the blanking channel; the heating unit includes a plurality of heating flue gas channels, each of the heating flue gas channels is arranged below each layer of the heat storage disc, and each of the heating flue gas channels is used to heat each layer of the heat storage disc.

[0008] Furthermore, the present invention also includes a catalytic unit, the feed end of the catalytic unit is connected to the pyrolysis gas outlet of the furnace body, and the catalytic unit is used to catalyze the pyrolysis gas.

[0009] Furthermore, the present invention also includes a condensation purification unit, the feed end of the condensation purification unit is connected to the discharge end of the catalytic unit, and the condensation purification unit is provided with an air outlet and a liquid outlet. The pyrolysis gas after catalysis by the catalytic unit enters the condensation purification unit and is sequentially dusted, indirectly water-cooled and alkaline washed for deacidification to form non-condensable pyrolysis gas and pyrolysis liquid. The non-condensable pyrolysis gas and pyrolysis liquid are discharged from the air outlet and the liquid outlet respectively, and the air outlet is connected to each of the pyrolysis gas pipelines, and the pyrolysis gas pipelines are connected to an air duct.

[0010] Furthermore, the present invention also includes an oil-water separation unit connected to the condensation purification unit, and the oil-water separation unit is used to separate the sewage and pyrolysis oil in the pyrolysis liquid.

[0011] Furthermore, the present invention also includes a tailings separation unit sealed and connected to the discharge port of the furnace body, and the tailings separation unit is used to screen the carbon slag and the granular heat carrier.

[0012] Furthermore, the heat carrier lifting unit is used to transport the granular heat carrier screened by the tailing separation unit onto the organic solid waste located on the topmost heat storage disc.

[0013] Furthermore, the present invention also includes a flue gas purification unit. The high-temperature flue gas generated by the mixture and combustion of the non-condensable pyrolysis gas and air heats the heat storage disc and then enters the flue gas purification unit for purification.

[0014] Furthermore, the present invention also includes a purification and blending unit connected to the discharge port of the oil-water separation unit, and the purification and blending unit is used to oxidize and remove impurities, decolorize, filter, adjust the pH and blend with reagents on the pyrolysis oil separated by the oil-water separation unit in sequence.

[0015] Furthermore, the present invention also includes a sewage treatment unit connected to the oil-water separation unit, and the sewage treatment unit is used to treat the sewage separated by the oil-water separation unit.

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

[0017] When the system for preparing fuel oil by pyrolysis of organic solid waste heat carrier of the present invention is in use, each layer of heat storage disc is heated by the heating unit, and the topmost heat storage disc is defined as the first layer of heat storage disc, the heat storage disc closest to the first layer of heat storage disc is defined as the second layer of heat storage disc, and so on; the organic solid waste is sealed and transported onto the first layer of heat storage disc through the sealed feeding unit, and at the same time, the granular heat carrier is transported onto the organic solid waste located on the first layer of heat storage disc through the heat carrier lifting unit. At this time, the power unit drives the rotating shaft to rotate, driving the material stripping parts of each layer to rotate. The material stripping part above the first layer of heat storage disc spreads the organic solid waste and the granular heat carrier on the first layer of heat storage disc evenly on the first layer of heat storage disc for heating, forming a thin layer of material layer, thereby promoting rapid pyrolysis and gasification of the organic solid waste. Since the dropping channels on each layer of heat storage disc are staggered, when the organic solid waste and granular heat carrier on the first layer of heat storage disc enter the dropping channel on the first layer of heat storage disc under the manipulation of the material-dividing member above the first layer of heat storage disc, the organic solid waste and granular heat carrier fall onto the second layer of heat storage disc; at this time, under the manipulation of the material-dividing member above the second layer of heat storage disc, the organic solid waste and granular heat carrier on the second layer of heat storage disc are evenly distributed on the second layer of heat storage disc for heating, so that the organic solid waste is further pyrolyzed and gasified, and this cycle continues until the organic solid waste and granular heat carrier enter the bottom layer of heat storage disc, so that the organic solid waste is finally pyrolyzed to form tailings. Finally, the tailings and granular heat carrier are discharged from the discharge port, and the pyrolysis gas generated after the pyrolysis of the organic solid waste is discharged from the pyrolysis gas outlet from bottom to top.

[0018] In summary, the present invention adopts a dual direct contact heat exchange method of heat storage discs and granular heat carriers to pyrolyze and gasify thin layers of organic solid waste, greatly improving the heat transfer efficiency and pyrolysis efficiency of the pyrolysis process; in addition, the thin-layer gasification pyrolyzer is equipped with multiple layers of heat storage discs and multiple layers of material shifting parts, so that the organic solid waste materials can be evenly spread on the heat storage discs, greatly increasing the heat exchange area and making the heat exchange of the organic solid waste more sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a thin-layer gasification pyrolyzer according to an embodiment of the present invention;

[0020] Figure 2 This is a structural diagram of the connection between the material shifting member and the material shifting chain according to an embodiment of the present invention;

[0021] Figure 3 The system for preparing fuel oil by pyrolysis of organic solid waste heat carrier of the present invention;

[0022] Figure 4 This is a flow chart of preparing fuel oil from organic solid waste according to the present invention.

[0023] Figure Number:

[0024] 1. Sealed feeding unit; 2. Thin-layer gasification pyrolyzer; 20. Furnace body; 201. Feed port; 202. Pyrolysis gas outlet; 204. Discharge port; 205. Flue gas outlet; 21. Heat storage plate; 210. Dropping channel; 211. Organic solid waste channel; 22. Power unit; 23. Rotating shaft; 24. Feeding piece; 240. Feeding chain; 25. Pyrolysis gas pipeline; 250. Air pipeline; 251. Pyrolysis gas burner; 26. Isolation plate; 27. Tailing separation unit; 28. Heating flue gas channel; 3. Catalytic unit; 4. Condensation purification unit; 5. Oil-water separation unit; 6. Purification and blending unit; 7. Heat carrier lifting unit; 8. Flue gas purification unit; 9. Sewage treatment unit. DETAILED DESCRIPTION

[0025] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0026] In the description of the present invention, it should be understood that the terms "width", "up", "down", "front", "back", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying 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 a limitation on the present invention. In addition, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", and "set" 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, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0027] In the present invention, unless otherwise clearly stipulated and limited, the first feature being "on" or "under" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0028] Please refer to Figure 1 - Figure 4 The present invention provides a system for preparing fuel oil by pyrolysis of organic solid waste heat carrier, comprising a sealed feeding unit 1, a thin-layer gasification pyrolyzer 2, a catalytic unit 3, a condensation purification unit 4, an oil-water separation unit 5, a purification and blending unit 6, a heat carrier lifting unit 7, a flue gas purification unit 8, a sewage treatment unit 9, a heating unit, and a tailings separation unit 27. The sealed feeding unit 1, the thin-layer gasification pyrolyzer 2, the catalytic unit 3, the condensation purification unit 4, the oil-water separation unit 5, and the purification and blending unit 6 are connected in sequence.

[0029] In one embodiment, the sealed feeding unit 1 includes a hopper, a belt conveyor, a belt scale, and a sealed screw conveyor. Organic solid waste is transported to the hopper. The organic solid waste in the hopper then passes through the belt conveyor, the belt scale, and finally enters the thin-layer gasification pyrolyzer 2 via the sealed screw conveyor. Therefore, the hopper's feed port 201 and the sealed screw conveyor's discharge end serve as the feed and discharge ends of the sealed feeding unit 1, respectively.

[0030] It should be noted that the hopper, belt conveyor, belt scale and sealed screw conveyor are all existing structures and will not be described in detail here.

[0031] In one embodiment, the thin-layer gasification pyrolyzer 2 includes a vertical furnace body 20, a multi-layer heat storage plate 21, and a material selection assembly. The multi-layer heat storage plate 21 is arranged in the furnace body 20 at intervals along the axial direction of the furnace body 20; the furnace body 20 is a vertical cylindrical shape, and in the furnace body 20, the space above each layer of heat storage plate 21 is an organic solid waste channel 211. The top of the furnace body 20 is provided with a feed port 201, a pyrolysis gas outlet 202, and a heat carrier inlet. The top feed port 201 on the furnace body 20 also serves as the heat carrier inlet of the furnace body 20; the feed port 201, the pyrolysis gas outlet 202, and the heat carrier inlet are all connected to the organic solid waste channel 211 on the top layer. In addition, a discharge port 204 is provided at the bottom of the furnace body 20, and the discharge end of the sealed feeding unit 1 is sealedly connected to the feed port 201 on the furnace body 20. The sealed feeding unit 1 is used to seal and transport the organic solid waste to be processed into the top-layer organic solid waste channel 211, so that the organic solid waste enters the top-layer heat storage disc 21, and the granular heat carrier is mixed with the organic solid waste on the heat storage disc 21; each layer of the heat storage disc 21 is provided with a drop channel 210, and each drop channel 210 is staggered, and each drop channel 210 is connected to each organic solid waste channel 211. Of course, the drop channel 210 on the top-layer heat storage disc 21 is staggered with the feed end of the sealed feeding unit 1 to prevent the organic solid waste from falling directly from the discharge end of the sealed feeding unit 1 into the drop channel 210 on the top-layer heat storage disc 21.

[0032] In one embodiment, the material dispensing assembly includes a power unit 22, a rotating shaft 23, and multiple layers of dispensing members 24. The rotating shaft 23 is rotatably disposed within the furnace body 20 via a bearing, and the rotating shaft 23 extends axially along the furnace body 20. The power unit 22 is disposed outside the furnace body 20, and the power unit 22 uses a motor to drive the rotating shaft 23 to rotate. Multiple layers of the dispensing members 24 are disposed on the rotating shaft 23 at intervals along the axial direction of the rotating shaft 23, and each layer of the dispensing members 24 is located above each layer of the heat storage disc 21. The dispensing members 24 on each layer are used to evenly spread the organic solid waste on each layer of the heat storage disc 21 on each layer of the heat storage disc 21, and to dispensing the organic solid waste on each layer of the heat storage disc 21 from each material dropping channel 210.

[0033] In one embodiment, the material-diverting member 24 is a diverting rod. The distance between the lowest point of the diverting chain on each layer of the diverting rod and each layer of the thermal storage plate is set to D. D should satisfy the relationship: 0 < D < 1 cm. In addition, a diverting chain 240 is fixed to the material-diverting member 24. The diverting chain 240 can increase the friction between the material-diverting member 24 and the organic solid waste, thereby improving the material-diverting effect.

[0034] In one embodiment, the output end of the heat carrier lifting unit 7 is connected to the feed port 201 of the furnace body 20, so that the heat carrier lifting unit 7 can transport multiple granular heat carriers into the organic solid waste channel 211 on the top layer, thereby allowing multiple granular heat carriers to enter the organic solid waste located on the top layer of the heat storage disk 21.

[0035] The heat carrier lifting unit 7 of this embodiment adopts a bucket elevator, which will not be described in detail here.

[0036] In one embodiment, the heating unit is sealed and connected to the pyrolysis gas inlet on the furnace body 20. The heating unit is used to heat each layer of the heat storage discs 21, achieving thin-layer gasification and pyrolysis of the organic solid waste. Specifically, the heating unit is independently provided and disconnected from each material discharge channel 210. The heating unit includes multiple heating flue gas channels 28, each located below each layer of the heat storage discs 21 and used to heat each layer of the heat storage discs 21.

[0037] As can be understood from the above, the organic solid waste is ultimately pyrolyzed within the thin-layer gasification pyrolyzer 2 to form tailings. The tailings and the granular heat carrier are discharged from the discharge port 204 of the furnace body 20, while the pyrolysis gas generated by the pyrolysis of the organic solid waste is discharged from the bottom to the top through the pyrolysis gas outlet 202 of the furnace body 20. In addition, within the furnace body 20, the heat storage disc 21 and the granular heat carrier are in direct contact with the organic solid waste, that is, a dual direct contact heat exchange method is used to pyrolyze the organic solid waste. This greatly improves the heat transfer efficiency and pyrolysis efficiency of the pyrolysis process and avoids the defect of insufficient pyrolysis of the organic solid waste.

[0038] In one embodiment, the feed port 201 of the tailings separation unit 27 is sealed and connected to the discharge port 204 of the furnace body 20. The tailings separation unit 27 is used to screen the carbon slag and granular heat carrier discharged from the discharge port 204 of the furnace body 20. The carbon slag screened by the tailings separation unit 27 is cooled and collected; the granular heat carrier screened enters the heat carrier lifting unit 7. The coarse granular heat carrier passes through the heat carrier lifting unit 7 and re-enters the organic solid waste on the topmost heat storage plate 21 in the furnace body 20, forming a heat carrier heating cycle.

[0039] The tailings separation unit 27 of this embodiment adopts the existing tailings separation structure, which will not be described in detail here.

[0040] In one embodiment, the feed end of the catalytic unit 3 is connected to the pyrolysis gas outlet 202 of the furnace body 20. The catalytic unit 3 is used to catalyze the pyrolysis gas discharged from the pyrolysis gas outlet 202 of the furnace body 20. Specifically, the catalytic unit 3 includes a catalyst bed. The pyrolysis gas generated by the pyrolysis of organic solid waste is catalytically reformed by the catalyst bed. The reformed pyrolysis gas enters the condensation purification unit 4 and undergoes dust removal, indirect water cooling, and alkaline washing and deacidification purification in sequence to produce non-condensable pyrolysis gas and pyrolysis liquid.

[0041] In one embodiment, the feed end of the condensation purification unit 4 is connected to the discharge end of the catalytic unit 3, and the condensation purification unit 4 is provided with an air outlet and a liquid outlet. The pyrolysis gas after catalysis by the catalytic unit 3 enters the condensation purification unit 4 and is sequentially dusted, indirectly water-cooled and alkaline washed for deacidification to form non-condensable pyrolysis gas and pyrolysis liquid. Of course, the non-condensable pyrolysis gas and pyrolysis liquid are discharged from the air outlet of the condensation purification unit 4 and the liquid outlet of the condensation purification unit 4, respectively. In addition, the air outlet of the condensation purification unit 4 is connected to each of the pyrolysis gas pipes 25, and the pyrolysis gas pipes 25 are connected to an air pipe 250. The air outlet on the pyrolysis gas pipe 25 is provided with a pyrolysis gas burner 251, and the opening of the pyrolysis gas burner 251 faces the heat storage disk 21. As can be seen, the non-condensable pyrolysis gas enters the pyrolysis gas duct 25 and mixes with the air entering the pyrolysis gas duct 25 from the air duct 250, where it burns to produce high-temperature flue gas that heats each layer of the heat storage discs 21, thereby providing heat for the pyrolysis of the organic solid waste. The air entering the pyrolysis gas duct 25 from the air duct 250 mixes with the air and burns to produce high-temperature flue gas that heats each layer of the heat storage discs 21. The high-temperature flue gas then passes through the heated flue gas passage 28 and enters the flue gas purification unit 8 from the flue gas outlet 205.

[0042] In one embodiment, the flue gas purification unit 8 is sealed and connected to the flue gas outlet 205 on the furnace body 20. Since each heated flue gas channel 28 is independently disconnected from the organic solid waste channel 211 on each layer, the high-temperature flue gas generated by the combustion of the non-condensable pyrolysis gas mixed with air heats the heat storage disc 21 and then enters the flue gas purification unit 8 through the flue gas outlet 205 on the furnace body 20 for purification. Separation plates 26 are provided below each layer of the heat storage disc 21. Each layer of the separation plates 26 is fixed to the inner wall of the furnace body 20 and the outer wall of the blanking channel 210 of each layer of the heat storage disc 21. The separation plates 26 ensure that the heated flue gas channel 28 is independently disconnected from the organic solid waste channel 211.

[0043] The flue gas purification unit 8 of this embodiment uses an existing flue gas purification device, which will not be described in detail here.

[0044] In one embodiment, the condensation purification unit 4 includes a cyclone dust collector, a heat exchanger, and a spray tower. The cyclone dust collector is primarily used for dust removal from the pyrolysis gas; the plate heat exchanger is primarily used for indirect water cooling of the pyrolysis gas; and the spray tower is used for alkaline washing and deacidification of the pyrolysis gas. The purpose of dust removal is to remove solid particulate matter from the pyrolysis gas, prevent clogging or damage to subsequent processing equipment (such as heat exchangers and spray towers) due to particulate deposition, and reduce interference with subsequent purification processes (such as alkaline washing and deacidification), thereby improving purification efficiency. The principle of dust removal is to use a cyclone dust collector to separate particulate matter from the airflow using centrifugal force.

[0045] The purpose of indirect water cooling is to lower the temperature of the pyrolysis gas to the optimum temperature range required for subsequent purification processes such as alkaline washing and deacidification, while also recovering some heat and achieving rational energy utilization. Furthermore, the cooling process can condense some condensable gases into liquids, initially separating them from the non-condensable pyrolysis gas.

[0046] The principle of indirect water cooling: using indirect heat exchange, pyrolysis gas and cooling water exchange heat through the tube wall in the heat exchanger, pyrolysis gas releases heat, and cooling water absorbs heat and its temperature rises.

[0047] The purpose of alkaline washing and deacidification is to remove acidic gas components in pyrolysis gas, such as hydrogen chloride (HCl) and H2S, to prevent these acidic gases from corroding subsequent equipment, while reducing pollution to the environment and ensuring that the exhaust gas meets environmental protection standards.

[0048] The principle of alkaline elution is to use an alkaline solution (such as sodium hydroxide solution) to neutralize the acid gas. For example, HCl reacts with NaOH to produce sodium chloride (NaCl) and water (H2O).

[0049] Among them, the alkaline washing process is usually carried out in a spray tower. The pyrolysis gas enters from the bottom of the tower and is fully contacted with the alkaline solution sprayed from the top of the tower, and the acidic gas is absorbed.

[0050] It should be noted that the cyclone dust collector, heat exchanger and spray tower in the condensation purification unit 4 are all existing structures and will not be described in detail here.

[0051] In one embodiment, the feed end of the oil-water separation unit 5 is connected to the discharge end of the condensation purification unit 4 , and the oil-water separation unit 5 is used to separate the sewage and the pyrolysis oil in the pyrolysis liquid.

[0052] It should be noted that the oil-water separation unit 5 uses an existing oil-water separator, which will not be described in detail here.

[0053] In one embodiment, the feed port 201 of the purification and blending unit 6 is sealed and connected to the oil outlet of the oil-water separation unit 5. The purification and blending unit 6 is used to oxidize and remove impurities, decolorize, filter, adjust the pH and blend with reagents on the pyrolysis oil separated by the oil-water separation unit 5 in sequence to finally obtain fuel oil.

[0054] In one embodiment, the purification and blending unit 6 includes a stirred tank reactor, a decolorization device, a filtration device, a pH adjustment device, and a reagent blending device. These devices, respectively, perform oxidation and impurity removal, decolorization, filtration, pH adjustment, and reagent blending on the pyrolysis oil. The oxidation and impurity removal, decolorization, filtration, pH adjustment, and reagent blending of the pyrolysis oil are conventional processes for processing pyrolysis oil to obtain fuel oil and are not described in detail here.

[0055] It should be noted that the stirred reactor, decolorization equipment, filtration equipment, pH adjustment equipment and drug blending equipment all use existing equipment structures and are not described in detail here.

[0056] In one embodiment, the sewage treatment unit 9 is connected to the sewage outlet of the oil-water separation unit 5 , and the sewage treatment unit 9 is used to treat the sewage separated by the oil-water separation unit 5 .

[0057] It should be noted that the sewage treatment unit 9 adopts an existing sewage treatment structure, which will not be described in detail here.

[0058] Working principle of the present invention:

[0059] When the organic solid waste heat carrier pyrolysis system of the present invention is in use, each layer of heat storage disc 21 is heated by the heating unit. Here, the top layer of heat storage disc 21 is defined as the first layer of heat storage disc 21, and the heat storage disc 21 closest to the first layer of heat storage disc 21 is defined as the second layer of heat storage disc 21, and so on; the organic solid waste is sealed and transported into the first layer of heat storage disc 21 through the sealed feeding unit 1, and at the same time, the granular heat carrier is transported into the organic solid waste located on the first layer of heat storage disc 21 through the heat carrier lifting unit 7. At this time, the power unit 22 drives the rotary The rotating shaft 23 rotates, driving the material-dividing members 24 of each layer to rotate. The material-dividing member 24 above the first layer of heat storage plate 21 evenly distributes the organic solid waste and the granular heat carrier on the first layer of heat storage plate 21 on the first layer of heat storage plate to heat the organic solid waste, and since the material-dividing channels 210 on each layer of heat storage plate 21 are staggered, when the organic solid waste and the granular heat carrier on the first layer of heat storage plate 21 enter the material-dividing channel 210 on the first layer of heat storage plate under the diversion of the material-dividing member 24 above the first layer of heat storage plate, the organic solid waste and the granular heat carrier fall into the second layer of heat storage plate 21. At this time, under the action of the material shifting member 24 above the second heat storage disc 21, the organic solid waste and the granular heat carrier on the second heat storage disc 21 are evenly distributed on the second heat storage plate for heating, so that the organic solid waste is further pyrolyzed, and this cycle continues until the organic solid waste and the granular heat carrier enter the bottom heat storage disc 21, so that the organic solid waste is finally pyrolyzed to form tailings. Finally, the tailings and the granular heat carrier are discharged from the discharge port 204 and enter the tailings separation unit 27 for screening. The screened carbon slag is cooled and collected, and the screened granular heat carrier enters the heat carrier lifting unit 7 and re-enters In the organic solid waste channel 211 at the top layer of the furnace body 20, a heat carrier heating cycle is formed; and the pyrolysis gas generated after the pyrolysis of the organic solid waste is discharged from the pyrolysis gas outlet 202 from bottom to top, and enters the condensation purification unit 4, and is sequentially purified by dust removal, indirect water cooling and alkaline washing and deacidification to obtain non-condensable pyrolysis gas and pyrolysis liquid. The non-condensable pyrolysis gas enters the pyrolysis gas pipeline 25 and is mixed with the air entering the pyrolysis gas pipeline 25 from the air pipeline 250 to burn to generate high-temperature flue gas to heat each layer of the heat storage plate 21. The pyrolysis liquid enters the purification and blending unit 6 for purification and blending to obtain fuel oil.

[0060] In summary:

[0061] 1. The present invention adopts a dual direct contact heat exchange method of the heat storage disc 21 and the granular heat carrier to pyrolyze organic solid waste, greatly improving the heat transfer efficiency and pyrolysis efficiency of the pyrolysis process.

[0062] 2. The thin-layer gasification pyrolyzer 2 is provided with multiple layers of heat storage plates 21 and multiple layers of material shifting members 24, so that the organic solid waste can be evenly spread on the heat storage plates 21, greatly increasing the heat exchange area and making the organic solid waste heat exchange more sufficient.

[0063] 3. Encased in the granular heat carrier, the organic solid waste is rapidly heated to the pyrolysis temperature, the generated pyrolysis gas is quickly discharged, and the slag after pyrolysis is separated, and the granular heat carrier can be recycled. Compared with traditional indirect pyrolysis technology, the heat carrier pyrolysis technology of this invention significantly improves heat exchange efficiency by directly contacting the organic solid waste, thereby shortening reaction time, reducing equipment size, and improving pyrolysis efficiency. This allows for the extensive resource utilization of pyrolysis products and reduces energy consumption.

[0064] 4. Realize the recovery of high-quality pyrolysis oil products, which can be used as fuel oil to achieve waste-to-energy conversion.

[0065] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A system for preparing fuel oil by pyrolysis of organic solid waste heat carrier, characterized in that: It includes a sealed feeding unit, a thin-layer gasification pyrolyzer, a particle heat carrier, a heat carrier lifting unit and a heating unit. The thin-layer gasification pyrolyzer includes a vertical furnace body, a multi-layer heat storage disc and a material shifting assembly. The multi-layer heat storage disc is arranged in the furnace body at intervals along the axial direction of the furnace body; the furnace body is provided with a feeding port, a discharging port and a pyrolysis gas outlet, and the discharging end of the sealed feeding unit is sealed with the feeding port for sealingly conveying the organic solid waste to be processed into the top layer of the heat storage disc; each layer of the heat storage disc is provided with a blanking channel, and each blanking channel is staggered; the material shifting assembly includes a power unit, a rotating shaft and a multi-layer material shifting member, the rotating shaft is rotatably arranged in the furnace body, and the rotating shaft extends along the axial direction of the furnace body; the power unit is arranged in the furnace body In addition, it is used to drive the rotating shaft to rotate; multiple layers of the material-diverting parts are arranged on the rotating shaft at intervals along the axial direction of the rotating shaft, and each layer of the material-diverting parts is located above each layer of the heat storage disc; each layer of the material-diverting parts is used to evenly spread the organic solid waste on each layer of the heat storage disc to form a thin layer of material, and to divert the organic solid waste on each layer of the heat storage disc from each material-dropping channel; the heat carrier lifting unit is used to transport multiple granular heat carriers into the heat storage disc located on the top layer, and the granular heat carriers are mixed with the organic solid waste on the heat storage disc, and the heating unit is connected to the furnace body for heating multiple heat storage discs, and the pyrolysis gas and tailings generated after the pyrolysis of the organic solid waste are discharged from the pyrolysis gas outlet and the discharge port respectively.

2. The system for preparing fuel oil by pyrolysis of organic solid waste heat carrier according to claim 1, characterized in that: The heating unit is independently arranged and not connected to the blanking channel; the heating unit includes a plurality of heating flue gas channels, each of which is arranged below each layer of the heat storage disc, and each of the heating flue gas channels is used to heat each layer of the heat storage disc.

3. The system for preparing fuel oil by pyrolysis of organic solid waste heat carrier according to claim 2, characterized in that: It also includes a catalytic unit, the feed end of the catalytic unit is connected to the pyrolysis gas outlet of the furnace body, and the catalytic unit is used to catalyze the pyrolysis gas.

4. The system for preparing fuel oil by pyrolysis of organic solid waste heat carrier according to claim 3, characterized in that: It also includes a condensation purification unit, the feed end of the condensation purification unit is connected to the discharge end of the catalytic unit, and the condensation purification unit is provided with an air outlet and a liquid outlet. The pyrolysis gas after catalysis by the catalytic unit enters the condensation purification unit and is sequentially dusted, indirectly water-cooled and alkaline washed for deacidification to form non-condensable pyrolysis gas and pyrolysis liquid. The non-condensable pyrolysis gas and pyrolysis liquid are discharged from the air outlet and the liquid outlet respectively. The air outlet is connected to each of the pyrolysis gas pipelines, and the pyrolysis gas pipelines are connected to an air duct.

5. The system for preparing fuel oil by pyrolysis of organic solid waste heat carrier according to claim 4, characterized in that: It also includes an oil-water separation unit connected to the condensation purification unit, and the oil-water separation unit is used to separate the sewage and pyrolysis oil in the pyrolysis liquid.

6. The system for preparing fuel oil by pyrolysis of organic solid waste heat carrier according to claim 1, characterized in that: It also includes a tailings separation unit that is sealed and connected to the discharge port of the furnace body, and the tailings separation unit is used to screen the carbon slag and the granular heat carrier.

7. The system for preparing fuel oil by pyrolysis of organic solid waste heat carrier according to claim 6, characterized in that: The heat carrier lifting unit is used to transport the granular heat carrier screened by the tailing separation unit onto the organic solid waste located on the topmost heat storage disc.

8. The system for preparing fuel oil by pyrolysis of organic solid waste heat carrier according to claim 4, characterized in that: It also includes a flue gas purification unit. The high-temperature flue gas generated by the mixture and combustion of the non-condensable pyrolysis gas and air heats the heat storage disc and then enters the flue gas purification unit for purification.

9. The system for preparing fuel oil by pyrolysis of organic solid waste heat carrier according to claim 5, characterized in that: It also includes a purification and blending unit connected to the discharge port of the oil-water separation unit, and the purification and blending unit is used to oxidize and remove impurities, decolorize, filter, adjust the pH and blend with reagents on the pyrolysis oil separated by the oil-water separation unit.

10. The system for preparing fuel oil by pyrolysis of organic solid waste heat carrier according to claim 5, characterized in that: It also includes a sewage treatment unit connected to the oil-water separation unit, and the sewage treatment unit is used to treat the sewage separated by the oil-water separation unit.

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