High-humidity organic solid waste drying and pyrolysis system

Abstract

The utility model discloses a drying and pyrolyzing system for high-humidity organic solid waste. The drying and pyrolyzing system comprises a drying module and a pyrolyzing module, the drying module comprises a first drying device, a second drying device and a waste heat utilization device, the first drying device is connected with the second drying device, the first drying device is provided with a gas-liquid heat exchanger, and a heat-conducting medium in the gas-liquid heat exchanger is used for heating hot air and drying high-humidity materials in the first drying device; the second drying device is used for secondarily drying the semi-dry materials discharged by the first drying device, the waste heat utilization device comprises a heat recovery condenser, the second drying device is connected with the heat recovery condenser, and the heat recovery condenser is connected with the gas-liquid heat exchanger. And water vapor in drying gas discharged by the second drying device is condensed to release condensation latent heat which exchanges heat with a heat-conducting medium in the gas-liquid heat exchanger to serve as a heat source of the first drying device. The heat-conducting medium is heated through latent heat of condensation released when the drying gas is condensed, so that heat self-balance is achieved when the high-humidity material is dried and carbonized, and additional heat supplement is not needed.

Description

Technical Field

[0001] The utility model relates to the technical field of solid waste environmental management, and in particular discloses a high-humidity organic solid waste drying and pyrolysis system. Background Art

[0002] The use of pyrolysis technology to dispose of organic solid materials can seal a portion of the carbon in the form of fixed carbon in the carbonization product, and the emission of carbon dioxide is lower than incineration.

[0003] The combustion of syngas produced by pyrolysis belongs to gas phase combustion, and the excess air coefficient is lower than that of solid phase combustion. The total amount of flue gas produced by pyrolysis gas combustion is about 30% to 40% of that of incineration. When the material is biomass, the total amount of combustion flue gas after condensation and oil recovery of pyrolysis gas is even lower. Therefore, the emission of gaseous pollutants produced by pyrolysis is lower than that of incineration. The pyrolysis process is in an oxygen-deficient environment, which inhibits the generation of dioxin pollutants that are harmful to the human body at the source, and has a lower impact on the environment.

[0004] Compared with the single use of incineration products as building materials, the products after pyrolysis and carbonization contain elements such as nitrogen, phosphorus, potassium, and heavy metals and their compounds that are solidified and stabilized. They can be used for a variety of purposes such as building materials, soil improvement, and coal alternative fuels, which is in line with the development idea of ​​waste recycling.

[0005] When treating and disposing of high-humidity organic solid materials such as municipal sludge, it is necessary to pre-treat the materials and dry them. The conventional drying method is to use flue gas waste heat to dry the materials, as described in CN202223214449 "Biomass Drying and Pyrolysis with Flue Gas Waste Heat Utilization Device". However, this process only utilizes flue gas waste heat. It is difficult to achieve heat self-balance when drying high-humidity materials, and additional heat is required. At the same time, the heat generated by pyrolysis is lower than that of incineration, and the drying cost is relatively high. Therefore, the application of pyrolysis technology in the field of treating and disposing of high-humidity organic solid materials is restricted. Utility Model Content

[0006] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a drying pyrolysis system that can achieve heat self-balance when drying high-humidity materials, does not require additional heat, utilizes heat in a cascade manner, and reduces the cost of material drying.

[0007] To achieve the above-mentioned purpose, the utility model provides a high-humidity organic solid waste drying and pyrolysis system, including a drying module and a pyrolysis module; the drying module includes a first drying device, a second drying device and a waste heat utilization device, the first drying device is equipped with a gas-liquid heat exchanger, and the heat released by the heat-conducting medium in the gas-liquid heat exchanger is used to heat and dry the high-humidity material in the first drying device, and the first drying device is also provided with a high-humidity material inlet and a semi-dry material outlet; the second drying device is provided with a semi-dry material inlet, a dry material outlet and a drying gas outlet, the semi-dry material inlet is connected to the semi-dry material outlet, and the second drying device is used to perform secondary drying on the semi-dry material discharged from the first drying device; the waste heat utilization device includes a heat recovery condenser, the drying gas outlet of the second drying device is connected to the heat recovery condenser, and the low-temperature heat-conducting medium output by the gas-liquid heat exchanger is connected to the heat recovery condenser. The material is processed by the heat recovery condenser to become a high-temperature heat-conducting medium and reflux to the gas-liquid heat exchanger. The heat recovery condenser is connected to the gas-liquid heat exchanger. The condensation latent heat released by the condensation of water vapor in the dry gas discharged by the second drying device exchanges heat with the heat-conducting medium entering the heat recovery condenser to become a high-temperature heat-conducting medium as a heat source for the first drying device. The pyrolysis module includes a pyrolysis device and a combustion chamber. The pyrolysis device is provided with a dry material inlet, a pyrolysis gas outlet and a carbonized product outlet. The combustion chamber is provided with a pyrolysis gas inlet, an air inlet, a furnace gas inlet and a high-temperature flue gas outlet. The dry material inlet is connected to the dry material outlet, and the pyrolysis gas outlet is connected to the pyrolysis gas inlet. The combustion chamber is connected to the second drying device and the pyrolysis device in sequence via the high-temperature flue gas outlet. The pyrolysis device is used to pyrolyze the dry material discharged by the second drying device to generate pyrolysis gas and carbonized products. The utility model heats the heat-conducting medium by the condensation latent heat released when the dry gas is condensed, so that the first drying device achieves heat self-balance when drying high-humidity materials, without the need for additional heat supplementation, and the heat is used in a cascade manner, thereby reducing the material drying cost and improving thermal efficiency.

[0008] Furthermore, the gas-liquid heat exchanger is a dehumidification heat pump, and the heat transfer medium is circulating hot water. Circulating hot water has good heat transfer performance, can quickly and evenly transfer heat to high-humidity materials, promote rapid dehydration and drying, and its temperature is easy to control and adjust, can maintain the temperature in the system stable, and is conducive to the control of process parameters and stable operation; at the same time, compared with other heat transfer media (such as thermal oil), its operation and maintenance costs are usually lower, hot water is not easy to oxidize and pollute, and has less corrosion and damage to system equipment during long-term use, reducing equipment maintenance costs and downtime.

[0009] Furthermore, the waste heat utilization device also includes a flue gas cooler, the pyrolysis device is connected to the flue gas cooler, the flue gas cooler is connected to the heat recovery condenser, the high-temperature flue gas discharged from the pyrolysis device enters the flue gas cooler, the heat transfer medium flowing out of the gas-liquid heat exchanger flows into the flue gas cooler via the heat recovery condenser, and the high-temperature flue gas and water vapor after entering the flue gas cooler exchange heat with the heat transfer medium in the flue gas cooler through the condensation latent heat released by the heat recovery condenser, and the heat transfer medium is heated to a high-temperature heat transfer medium and refluxed to the first drying device for recycling. The high-temperature flue gas exchanges heat with the heat transfer medium, and the heat transfer medium is heated twice to ensure the drying efficiency of the first drying device.

[0010] Furthermore, the heat recovery condenser is connected to the combustion chamber, and the non-condensable gas discharged from the second drying device is condensed and separated by the heat recovery condenser to form non-condensable gas, and the non-condensable gas enters the combustion chamber and is mixed with the pyrolysis gas and combustion-supporting air discharged from the pyrolysis device to generate high-temperature flue gas. The non-condensable gas contains gas fuel, which can be used as energy supply by passing the non-condensable gas into the combustion chamber for combustion, thereby reducing energy costs and improving economic benefits.

[0011] Furthermore, the pyrolysis module also includes a tail gas treatment device, which is connected to the flue gas cooler and is used to treat the low-temperature flue gas discharged from the flue gas cooler. An induced draft fan is provided between the flue gas cooler and the tail gas treatment device, and the induced draft fan is used to transport the low-temperature flue gas to the tail gas treatment device. The tail gas treatment device effectively removes harmful substances in the low-temperature flue gas, thereby improving the efficiency of low-temperature flue gas treatment.

[0012] Furthermore, a first gas-solid separation chamber is provided between the pyrolysis device and the combustion chamber, the first gas-solid separation chamber is connected to the pyrolysis device via a pyrolysis gas outlet, and the first gas-solid separation chamber is used to separate the carbonized product and pyrolysis gas generated by pyrolysis of the pyrolysis device, and the pyrolysis gas separated by the first gas-solid separation chamber flows into the combustion chamber. The first gas-solid separation chamber can quickly separate the pyrolysis gas and the carbonized product, and complete the recovery of the carbonized product.

[0013] Furthermore, a high-temperature cyclone dust collector is provided between the first gas-solid separation chamber and the combustion chamber, and the high-temperature cyclone dust collector is used to remove dust from the pyrolysis gas separated by the first gas-solid separation chamber. The high-temperature cyclone dust collector can effectively separate and remove dust from the exhaust gas by centrifugal force; at the same time, compared with other dust removal equipment, the high-temperature cyclone dust collector usually does not require additional energy consumption, reduces energy waste, and meets the requirements of energy conservation and environmental protection.

[0014] Furthermore, the first gas-solid separation chamber is connected to a storage tank, which is used to store the carbonized product separated by the first gas-solid separation chamber. A cooling water jacket spiral is provided between the first gas-solid separation chamber and the storage tank, and the cooling water jacket spiral is used to cool the carbonized product discharged from the first gas-solid separation chamber. The carbonized product contains elements such as nitrogen, phosphorus, potassium, and heavy metals and their compounds that are solidified and stabilized, and can be used for building materials, soil improvement, coal replacement fuel, and other purposes. Recycling the carbonized product is in line with the development idea of ​​waste recycling.

[0015] The beneficial effects of the utility model are as follows: the utility model heats the heat-conducting medium through the condensation latent heat released when the drying gas is condensed, so that the first drying device can achieve heat self-balance when drying high-humidity materials, without the need for additional heat supplementation, and the heat is utilized in a cascade manner, thereby reducing the material drying cost and improving thermal efficiency; the circulating hot water has good heat transfer performance, and can quickly and evenly transfer heat to the high-humidity material, prompting it to be quickly dehydrated and dried, and its temperature is easy to control and adjust, and can maintain the temperature in the system stable, which is beneficial to the control of process parameters and stable operation. At the same time, compared with other heat-conducting media (such as heat-conducting oil), its operation and maintenance costs are usually lower, and hot water is not easy to oxidize , it is not easy to pollute, and it has less corrosion and damage to the system equipment during long-term use, which reduces the maintenance cost and downtime of the equipment; the high-temperature flue gas exchanges heat with the heat transfer medium to reheat the heat transfer medium to ensure the drying efficiency of the first drying device; the non-condensable gas is passed into the combustion chamber for combustion, which can be used as an energy supply to reduce energy costs and improve economic benefits; compared with high-temperature drying, low-temperature dryers can usually reduce energy consumption and reduce the impact on the environment, meeting the requirements of energy conservation and environmental protection. At the same time, during the low-temperature drying process, the temperature is relatively low, which can avoid product quality losses that may be caused by high-temperature drying, such as pyrolysis, thereby improving product quality and reducing losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a high-humidity organic solid waste drying and pyrolysis system of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the drying module of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the pyrolysis module of the utility model.

[0019] Reference numerals include:

[0020] 1. Drying module; 11. First drying device; 111. High-humidity material inlet; 112. Semi-dry material outlet; 12. Second drying device; 121. Semi-dry material inlet; 122. Dry material outlet; 13. Waste heat utilization device; 131. Heat recovery condenser; 132. Flue gas cooler; 14. Gas-liquid heat exchanger; 15. Silo;

[0021] 2. Pyrolysis module; 21. Pyrolysis device; 211. Dry material inlet; 212. Carbonization product outlet; 213. Pyrolysis gas outlet; 22. Combustion chamber; 221. Pyrolysis gas inlet; 222. Air inlet; 223. Furnace gas inlet; 224. High-temperature flue gas outlet; 23. Tail gas treatment device; 231. Spray tower; 232. Exhaust pipe; 24. Draft fan; 25. First gas-solid separation chamber; 26. High-temperature cyclone dust collector; 27. Storage tank; 28. Cooling water jacket spiral; 29. ​​Second gas-solid separation chamber. DETAILED DESCRIPTION

[0022] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0023] See also Figures 1 to 3As shown, a high-humidity organic solid waste drying and pyrolysis system of the utility model comprises a drying module 1 and a pyrolysis module 2; the drying module 1 comprises a first drying device 11, a second drying device 12 and a waste heat utilization device 13, the first drying device 11 is provided with a gas-liquid heat exchanger 14, the heat released by the heat-conducting medium in the gas-liquid heat exchanger 14 is used to heat and dry the high-humidity material in the first drying device 11, the first drying device 11 is also provided with a high-humidity material inlet 111 and a semi-dry material outlet 112; the second drying device 12 is provided with a semi-dry material inlet 121 and a dry material outlet 122, the semi-dry material inlet 121 is connected to the semi-dry material outlet 112, the second drying device 12 is used for secondary drying of the semi-dry material discharged from the first drying device 11; the waste heat utilization device 13 comprises a heat recovery condenser 131, the dry gas outlet of the second drying device 12 is connected to the heat recovery condenser 131, and the low-temperature heat-conducting medium output by the gas-liquid heat exchanger 14 is processed by the heat recovery condenser 131 to become The high-temperature heat-conducting medium flows back to the gas-liquid heat exchanger 14, and the heat recovery condenser 131 is connected to the gas-liquid heat exchanger 14. The condensation latent heat released by the condensation of water vapor in the dry gas discharged from the second drying device 12 exchanges heat with the heat-conducting medium entering the heat recovery condenser 131 to become a high-temperature heat-conducting medium as a heat source for the first drying device 11; the pyrolysis module 2 includes a pyrolysis device 21 and a combustion chamber 22. The pyrolysis device 21 is provided with a dry material inlet 211, a pyrolysis gas outlet 213 and a carbonized product outlet 212. The combustion chamber 22 is provided with a pyrolysis gas inlet 221, an air inlet 222, a furnace gas inlet 223 and a high-temperature flue gas outlet 224. The drying material inlet 211 is connected to the drying material outlet 122, and the pyrolysis gas outlet 213 is connected to the pyrolysis gas inlet 221. The high-temperature flue gas discharged from the combustion chamber 22 via the high-temperature flue gas outlet 224 is transported to the second drying device 12 and the pyrolysis device 21 at one time. The pyrolysis device 21 is used to pyrolyze the drying material discharged from the second drying device 12 to generate pyrolysis gas and carbonization products. The utility model heats the heat-conducting medium through the condensation latent heat released when the drying gas is condensed, so that the first drying device 11 achieves heat self-balance when drying high-humidity materials, without the need for additional heat supplementation, and uses the heat in a cascade manner, reducing the material drying cost and improving thermal efficiency.

[0024] In this embodiment, the high-humidity material is input into the first drying device 11 through the high-humidity material inlet 111 for drying, and the gas-liquid heat exchanger 14 of the first drying device 11 heats and dries the high-humidity material in the first drying device 11 to generate semi-dry material. The semi-dry material is transferred to the second drying device 12 through the semi-dry material outlet 112 and the semi-dry material inlet 121 for secondary drying to generate dry material and dry gas. The dry gas generated by the second drying device 12 is transmitted to the heat recovery condenser 131. The condensation latent heat released when the dry gas is condensed heats the heat transfer medium in the gas-liquid heat exchanger 14, and the heat transfer medium heated by the dry gas flows back to the first drying device 11 for recycling; the dry material is transferred to the pyrolysis device 21 through the dry material outlet 122 and the dry material inlet 211, and the dry material is pyrolyzed by the pyrolysis device 21 to generate pyrolysis gas and carbonization products. The pyrolysis gas is put into the combustion chamber 22 and mixed with the combustion air to burn to generate high-temperature flue gas; the high-temperature flue gas enters the second drying device 12 and the pyrolysis device 21 in sequence and is used as a heat source.

[0025] In a further technical solution, a silo 15 is provided between the first drying device 11 and the second drying device 12 , and the silo 15 is used to store the semi-dry material discharged from the first drying device 11 .

[0026] The gas-liquid heat exchanger 14 is a dehumidification heat pump, and the heat transfer medium is circulating hot water. Circulating hot water has good heat transfer performance, can quickly and evenly transfer heat to high-humidity materials, promote rapid dehydration and drying, and its temperature is easy to control and adjust, can maintain the temperature in the system stable, and is conducive to the control of process parameters and stable operation; at the same time, compared with other heat transfer media (such as heat transfer oil), its operation and maintenance costs are usually lower, hot water is not easy to oxidize and pollute, and has less corrosion and damage to system equipment during long-term use, reducing equipment maintenance costs and downtime.

[0027] In a further technical solution, after the circulating hot water exchanges heat with the high-humidity material in the first drying device 11, the outlet water temperature is 70°C, and the water vapor in the drying gas is condensed into 80°C condensed water through the heat recovery condenser 131, and the released latent heat of condensation heats the circulating hot water to 90°C.

[0028] The waste heat utilization device 13 also includes a flue gas cooler 132. The pyrolysis device 21 is connected to the flue gas cooler 132. The flue gas cooler 132 is connected to the heat recovery condenser 131. The high-temperature flue gas discharged from the pyrolysis device 21 enters the flue gas cooler 132. The heat-conducting medium flowing out of the gas-liquid heat exchanger 14 flows into the flue gas cooler 132 via the heat recovery condenser 131. After entering the flue gas cooler 132, the high-temperature flue gas and water vapor exchange heat with the heat-conducting medium in the flue gas cooler 132 through the condensation latent heat released by the heat recovery condenser 131, and the heat-conducting medium is heated to a high-temperature heat-conducting medium and refluxed to the first drying device 11 for recycling. The high-temperature flue gas exchanges heat with the heat-conducting medium, and the heat-conducting medium is heated twice, thereby ensuring the drying efficiency of the first drying device 11.

[0029] In a further technical solution, the high-temperature flue gas exchanges heat with the heat-conducting medium, and the heat-conducting medium is reheated to above 90° C., thereby ensuring the drying efficiency of the first drying device 11 .

[0030] The heat recovery condenser 131 is connected to the combustion chamber 22. The non-condensable gas discharged from the second drying device 12 is condensed and separated into non-condensable gas through the heat recovery condenser 131. The non-condensable gas enters the combustion chamber 22 and is mixed with the pyrolysis gas and combustion-supporting air discharged from the pyrolysis device 21 to burn to generate high-temperature flue gas. The non-condensable gas contains gas fuel, which can be used as energy supply by passing the non-condensable gas into the combustion chamber 22 for combustion, thereby reducing energy costs and improving economic benefits.

[0031] The pyrolysis module 2 also includes a tail gas treatment device 23, which is connected to the flue gas cooler 132. The tail gas treatment device 23 is used to treat the low-temperature flue gas discharged from the flue gas cooler 132. An induced draft fan 24 is provided between the flue gas cooler 132 and the tail gas treatment device 23. The induced draft fan 24 is used to transport the low-temperature flue gas to the tail gas treatment device 23.

[0032] A first gas-solid separation chamber 25 is provided between the pyrolysis device 21 and the combustion chamber 22. The first gas-solid separation chamber 25 is connected to the pyrolysis device 21 via the pyrolysis gas outlet 213. The first gas-solid separation chamber 25 is used to separate the carbonized product and the pyrolysis gas generated by the pyrolysis of the pyrolysis device 21. The pyrolysis gas separated by the first gas-solid separation chamber 25 flows into the combustion chamber 22. The first gas-solid separation chamber 25 can quickly separate the pyrolysis gas and the carbonized product to complete the recovery of the carbonized product.

[0033] In a further technical solution, the pyrolysis gas outlet 213 and the carbonization product outlet 212 of the pyrolysis device 21 share a common outlet connected to the first gas-solid separation chamber 25 .

[0034] A high-temperature cyclone dust collector 26 is provided between the first gas-solid separation chamber 25 and the combustion chamber 22 . The high-temperature cyclone dust collector 26 is used to remove dust from the pyrolysis gas separated by the first gas-solid separation chamber 25 .

[0035] The high-temperature cyclone dust collector 26 can utilize centrifugal force to effectively separate and remove dust from the exhaust gas; at the same time, compared with other dust removal equipment, the high-temperature cyclone dust collector 26 usually does not require additional energy consumption, reduces energy waste, and meets the requirements of energy conservation and environmental protection.

[0036] The first gas-solid separation chamber 25 is connected to a storage tank 27, which is used to store the carbonized product separated by the first gas-solid separation chamber 25. A cooling water jacket spiral 28 is provided between the first gas-solid separation chamber 25 and the storage tank 27, and the cooling water jacket spiral 28 is used to cool the carbonized product discharged from the first gas-solid separation chamber 25. The carbonized product contains elements such as nitrogen, phosphorus, potassium, and heavy metals and their compounds that are solidified and stabilized, and can be used for building materials, soil improvement, coal replacement fuel, and other purposes. Recycling the carbonized product is in line with the development idea of ​​waste recycling.

[0037] In a further technical solution, the high-humidity material is a high-humidity organic solid material with a moisture content of 70%, and the semi-dry material is a material with a moisture content of 55%.

[0038] In a further technical solution, the exhaust gas auxiliary treatment device includes a spray tower 231 and an exhaust chimney 232. The spray tower 231 is connected to the flue gas cooler 132 via the induced draft fan 24, and the exhaust chimney 232 is connected to the spray tower 231. The low-temperature flue gas treated by the spray tower 231 is discharged via the exhaust chimney 232.

[0039] In this embodiment, the high-humidity material is input into the first drying device 11 through the high-humidity material inlet 111 for drying. The gas-liquid heat exchanger 14 of the first drying device 11 heats and dries the high-humidity material in the first drying device 11 to generate semi-dry material. The semi-dry material is transferred to the second drying device 12 through the semi-dry material outlet 112 and the semi-dry material inlet 121 for secondary drying to generate dry material and dry gas. The dry material and the dry gas are transmitted to the second drying device 12 through the dry material inlet 211 and the dry material outlet 122. The gas-solid separation chamber 29 performs gas-solid separation, the dried gas separated by the second gas-solid separation chamber 29 is input to the heat recovery condenser 131, and the dried material separated by the second gas-solid separation chamber 29 is input to the pyrolysis device 21; the condensation latent heat released when the water vapor in the dried gas is condensed heats the circulating hot water in the gas-liquid heat exchanger 14, and the dried gas is condensed and separated into non-condensable gas through the heat recovery condenser 131, and the non-condensable gas is passed into the combustion chamber 22; the dried material discharged into the pyrolysis device 21 is pyrolyzed to produce pyrolysis gas and carbonization products, and the pyrolysis device 21 produces The pyrolysis gas and carbonization product are transmitted to the first gas-solid separation chamber 25 for gas-solid separation. The pyrolysis gas separated in the first gas-solid separation chamber 25 passes through a high-temperature cyclone dust collector 26. The pyrolysis gas after dust removal is fed into the combustion chamber 22 and mixed with non-condensable gas and combustion-supporting air to generate high-temperature flue gas. The carbonization product separated in the first gas-solid separation chamber 25 is cooled by a cooling water jacket spiral 28. The cooled carbonization product is transported to a storage tank 27 for storage; the high-temperature flue gas sequentially enters the second drying device 12 and the pyrolysis device 21 for use as a heat source. The high-temperature flue gas discharged from the second drying device 12 flows into the flue gas cooler 132, and the high-temperature flue gas in the flue gas cooler 132 exchanges heat with the circulating hot water heated by the drying gas, and further heats the circulating hot water to above 90°C. The heated circulating hot water flows back to the first drying device 11 for recycling, and the high-temperature flue gas after heat exchange with the circulating hot water is cooled to low-temperature flue gas. The low-temperature flue gas is discharged after the acidic gas and particulate matter in the low-temperature flue gas are removed through the spray tower 231 under the suction of the induced draft fan 24, meeting the emission standards.

[0040] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A high-humidity organic solid waste drying and pyrolysis system, comprising a drying module (1) and a pyrolysis module (2); characterized in that: The drying module (1) comprises a first drying device (11), a second drying device (12) and a waste heat utilization device (13); the first drying device (11) is provided with a gas-liquid heat exchanger (14); the heat released by the heat-conducting medium in the gas-liquid heat exchanger (14) is used to heat and dry the high-humidity material in the first drying device (11); the first drying device (11) is also provided with a high-humidity material inlet (111) and a semi-dry material outlet (112); the second drying device (12) is provided with a semi-dry material inlet (121) and a dry material outlet (122); the semi-dry material inlet (121) is connected to the semi-dry material outlet (112); the second drying device (12) is used to heat the first drying device (111) and dry the high-humidity material inlet (111) and the semi-dry material outlet (112). The semi-dried material discharged from the device (11) is subjected to secondary drying; the waste heat utilization device (13) comprises a heat recovery condenser (131); the drying gas outlet of the second drying device (12) is connected to the heat recovery condenser (131); the low-temperature heat-conducting medium output from the gas-liquid heat exchanger (14) is processed by the heat recovery condenser (131) to become a high-temperature heat-conducting medium and then flows back to the gas-liquid heat exchanger (14); the heat recovery condenser (131) is connected to the gas-liquid heat exchanger (14); the condensation latent heat released by the condensation of water vapor in the drying gas discharged from the second drying device (12) is exchanged with the heat-conducting medium entering the heat recovery condenser (131) to become a high-temperature heat-conducting medium as a heat source for the first drying device (11); The pyrolysis module (2) comprises a pyrolysis device (21) and a combustion chamber (22); the pyrolysis device (21) is provided with a dry material inlet (211), a pyrolysis gas outlet (213) and a carbonized product outlet (212); the combustion chamber (22) is provided with a pyrolysis gas inlet (221), an air inlet (222), a furnace fuel gas inlet (223) and a high-temperature flue gas outlet (224); the dry material inlet (211) is connected to the dry material outlet (122); the pyrolysis gas outlet (213) is connected to the pyrolysis gas inlet (221); the high-temperature flue gas discharged from the combustion chamber (22) via the high-temperature flue gas outlet (224) is sequentially transported to a second drying device (12) and the pyrolysis device (21); the pyrolysis device (21) is used to pyrolyze the dry material discharged from the second drying device (12) to generate pyrolysis gas and carbonized products.

2. A high-humidity organic solid waste drying and pyrolysis system according to claim 1, characterized in that: The gas-liquid heat exchanger (14) is a dehumidification heat pump, and the heat transfer medium is circulating hot water.

3. A high-humidity organic solid waste drying and pyrolysis system according to claim 1, characterized in that: The waste heat utilization device (13) further comprises a flue gas cooler (132), the pyrolysis device (21) is connected to the flue gas cooler (132), the flue gas cooler (132) is connected to the heat recovery condenser (131), the high-temperature flue gas discharged from the pyrolysis device (21) enters the flue gas cooler (132), the heat-conducting medium flowing out of the gas-liquid heat exchanger (14) flows into the flue gas cooler (132) via the heat recovery condenser (131), and the high-temperature flue gas after entering the flue gas cooler (132) exchanges heat with the heat-conducting medium in the flue gas cooler (132) via the condensation latent heat released by the heat recovery condenser (131), so that the heat-conducting medium is heated to a high-temperature heat-conducting medium and refluxes to the first drying device (11) for recycling.

4. The high-humidity organic solid waste drying and pyrolysis system according to claim 1, characterized in that: The heat recovery condenser (131) is connected to the combustion chamber (22), and the non-condensable gas discharged from the second drying device (12) is condensed and separated into non-condensable gas through the heat recovery condenser (131). The non-condensable gas enters the combustion chamber (22) and is mixed with the pyrolysis gas and combustion-supporting air discharged from the pyrolysis device (21) to burn to generate high-temperature flue gas.

5. The high-humidity organic solid waste drying and pyrolysis system according to claim 3, characterized in that: The pyrolysis module (2) further comprises a tail gas treatment device (23), the tail gas treatment device (23) being connected to the flue gas cooler (132), the tail gas treatment device (23) being used to treat low-temperature flue gas discharged from the flue gas cooler (132), an induced draft fan (24) being provided between the flue gas cooler (132) and the tail gas treatment device (23), the induced draft fan (24) being used to transport the low-temperature flue gas to the tail gas treatment device (23).

6. The high-humidity organic solid waste drying and pyrolysis system according to claim 1, characterized in that: A first gas-solid separation chamber (25) is provided between the pyrolysis device (21) and the combustion chamber (22). The first gas-solid separation chamber (25) is connected to the pyrolysis device (21) via a pyrolysis gas outlet (213). The first gas-solid separation chamber (25) is used to separate the carbonized product and pyrolysis gas generated by pyrolysis of the pyrolysis device (21). The pyrolysis gas separated by the first gas-solid separation chamber (25) flows into the combustion chamber (22).

7. A high-humidity organic solid waste drying and pyrolysis system according to claim 6, characterized in that: A high-temperature cyclone dust collector (26) is provided between the first gas-solid separation chamber (25) and the combustion chamber (22), and the high-temperature cyclone dust collector (26) is used to remove dust from the pyrolysis gas separated in the first gas-solid separation chamber (25).

8. The high-humidity organic solid waste drying and pyrolysis system according to claim 6, characterized in that: The first gas-solid separation chamber (25) is connected to a storage tank (27), and the storage tank (27) is used to store the carbonized product separated by the first gas-solid separation chamber (25). A cooling water jacket spiral (28) is provided between the first gas-solid separation chamber (25) and the storage tank (27), and the cooling water jacket spiral (28) is used to cool the carbonized product discharged from the first gas-solid separation chamber (25).

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