High-efficiency low-consumption chain plate type fuel gas heat radiation indirect pyrolysis system

Abstract

The invention provides a high-efficiency low-consumption chain plate type fuel gas heat radiation indirect pyrolysis system, which belongs to the technical field of solid hazardous waste disposal, and comprises a nitrogen-filled low-pressure chain plate type pyrolysis subsystem I, a self-preheating type fuel gas heat radiation heat exchange subsystem II, a pyrolysis gas fractional condensation recycling subsystem III and an intelligent comprehensive control subsystem IV, the low-pressure chain plate type pyrolysis subsystem I of nitrogen exchanges heat with a high-temperature radiation section of the self-preheating type fuel gas heat radiation heat exchange subsystem II in the pyrolysis furnace; a low-pressure chain plate type pyrolysis subsystem I for combusting high-temperature tail gas and nitrogen of a self-preheating type fuel gas heat radiation heat exchange subsystem II exchanges heat with a discharging conveyor at a feeding conveying device or at the same time; pyrolysis flue gas generated in a pyrolysis furnace of the low-pressure chain plate type pyrolysis subsystem I of nitrogen is introduced into a pyrolysis gas fractional condensation recycling subsystem III for treatment. The device has the advantages of high yield, low energy consumption, high thermal efficiency and capability of recycling pyrolysis oil and recycling pyrolysis non-condensable gas.

Description

Technical Field

[0001] The present invention relates to the technical field of solid hazardous waste disposal, and in particular to a high-efficiency and low-consumption chain plate type gas thermal radiation indirect pyrolysis system. Background Art

[0002] Oily sludge (hereinafter referred to as "sludge") is an organic hazardous waste composed of mineral oil, minerals, water, mud and sand. It is a derivative hazardous waste generated during the extraction, refining and transportation of petroleum. Oily sludge can be divided into ground sludge, drilling sludge, refining sludge and tank bottom sludge according to its source. There are two major characteristics of hazardous waste sludge in my country. One is that the historical stock is extremely large, and the other is that the amount of new sludge generated each year is in the millions of tons. Moreover, these sludges contain a large amount of petroleum resources, highly toxic substances, and highly teratogenic and carcinogenic components. Therefore, it is of great significance to utilize sludge as a resource and treat it in a deep and harmless manner.

[0003] At present, there are two main thermal treatment technologies for oil sludge. One is direct thermal desorption, which uses a high-temperature heat source to directly heat the oil sludge; the other is indirect pyrolysis technology, which uses a high-temperature heat source to indirectly heat the oil sludge through heat transfer in a rotary kiln. Most of the above two thermal treatment technologies use liquefied natural gas or fuel oil as fuel, which has the risk of secondary pollution caused by fuel combustion, and the processing capacity of the exhaust system needs to be enhanced. At the same time, direct thermal desorption cannot achieve the recycling of petroleum resources; the indirect rotary kiln pyrolysis system has large equipment and high cost, and is prone to coking, uneven heating and other problems; in addition, when in the low temperature season at high latitudes, the thermal efficiency of the rotary kiln pyrolysis system is significantly reduced. Therefore, it is of great significance to develop an efficient and low-consumption chain plate type gas thermal radiation indirect pyrolysis system to increase the sludge processing capacity, realize oil recovery, reuse of pyrolysis gas, and avoid the loss of available resources. Summary of the invention

[0004] The purpose of the present invention is to provide a high-efficiency and low-consumption chain plate type gas thermal radiation indirect pyrolysis system to solve the technical problems existing in the above-mentioned background technology. The indirect pyrolysis system provided by the present invention can process a wide variety of sludge, has a large processing capacity, a high pollutant removal rate, can recover oil, reuse pyrolysis gas, and has a high resource utilization rate. The entire system operates in a closed oxygen-proof environment, which can avoid the generation of highly carcinogenic pollutants such as dioxins.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] A high-efficiency and low-consumption chain-plate type gas thermal radiation indirect pyrolysis system, comprising a nitrogen-filled low-pressure chain-plate type pyrolysis subsystem 1, a self-preheating gas thermal radiation heat exchange subsystem 2, a pyrolysis gas graded condensation recovery subsystem 3 and an intelligent comprehensive control subsystem 4;

[0007] The nitrogen-filled low-pressure chain plate type pyrolysis subsystem 1 includes a chain plate type indirect pyrolysis furnace, a nitrogen generator, a feed conveying device with a heat exchange jacket, and a discharge conveying device with a heat exchange jacket. The chain plate type indirect pyrolysis furnace is connected to the nitrogen generator, the feed conveying device with a heat exchange jacket, and the discharge conveying device with a heat exchange jacket, respectively. A material transmission chain plate is arranged inside the chain plate type indirect pyrolysis furnace.

[0008] The second self-preheating gas heat radiation heat exchange subsystem includes a self-preheating burner, a low calorific value burner, a high temperature heat radiation tube and a high temperature gas regulating valve. The high temperature heat radiation tube is arranged on the material transmission chain plate. The self-preheating burner and the low calorific value burner are respectively arranged on the high temperature heat radiation tube to supply heat to the high temperature heat radiation tube. The high temperature gas regulating valve is arranged on the top of the right side of the chain plate type indirect pyrolysis furnace. Two insulation pipes are respectively connected to the high temperature gas regulating valve.

[0009] The pyrolysis gas graded condensation recovery and utilization subsystem three includes a spray condensation solid-water-oil-gas four-phase separation skid and a molecular sieve gas purification device. The spray condensation solid-water-oil-gas four-phase separation skid is connected to the chain plate type indirect pyrolysis furnace, the spray condensation solid-water-oil-gas four-phase separation skid is connected to the molecular sieve gas purification device through a gas low-temperature heat exchanger, and the molecular sieve gas purification device is connected to the low calorific value burner through a high-precision induced draft fan.

[0010] Furthermore, a feed conveying device with a heat exchange jacket is arranged at the top left side of the chain plate type indirect pyrolysis furnace, and the feed conveying device with a heat exchange jacket is connected to the chain plate type indirect pyrolysis furnace through a star-shaped air locking device, and is used for inputting materials with lower air permeability. A chimney is arranged on the feed conveying device with a heat exchange jacket, and the feed conveying device with a heat exchange jacket is connected to the chimney through a centrifugal blower.

[0011] Furthermore, a discharge conveying device with a heat exchange jacket is arranged at the bottom end on the right side of the chain plate type indirect pyrolysis furnace. The discharge conveying device with a heat exchange jacket is connected to the chain plate type indirect pyrolysis furnace through a star-shaped air locking device for outputting materials with lower permeability.

[0012] Furthermore, a nitrogen generator is arranged on the left side of the chain plate type indirect pyrolysis furnace, and the nitrogen generator is connected to the chain plate type indirect pyrolysis furnace through three evenly distributed pipe openings, and is used to introduce nitrogen with a purity greater than 99.9% into the furnace.

[0013] Furthermore, a gravity-type explosion-proof door is arranged on the top of the chain-plate type indirect pyrolysis furnace, and a spring-type automatic pressure relief safety valve is arranged on the side of the chain-plate type indirect pyrolysis furnace.

[0014] Furthermore, a material transmission chain plate is transversely arranged inside the chain plate type indirect pyrolysis furnace, and is used to transmit the material input by the feeding conveying device with a heat exchange jacket to the discharging conveying device with a heat exchange jacket for output, and a plurality of material turners are arranged on the material transmission chain plate.

[0015] Furthermore, a plurality of high-temperature heat radiation tubes are arranged in parallel above or below the material conveying chain plate, and the self-preheating burner and the low calorific value burner are respectively arranged at both ends of the high-temperature heat radiation tubes. The self-preheating burner is provided with a burner pulse controller, and the low calorific value burner is provided with a burner proportional valve controller.

[0016] Furthermore, one end of the two insulated pipes respectively extends out of the left and right ends of the chain plate type indirect pyrolysis furnace, and one end of the two insulated pipes is respectively connected to a feed conveying device with a heat exchange jacket and a discharge conveying device with a heat exchange jacket, so as to pass the high-temperature exhaust gas into the heat exchange jackets of the feed conveying device with a heat exchange jacket and the discharge conveying device with a heat exchange jacket.

[0017] Furthermore, the spray condensation solid-water oil-gas four-phase separation skid is connected to the pyrolysis gas outlet of the chain plate type indirect pyrolysis furnace, and the spray condensation solid-water oil-gas four-phase separation skid is provided with a cooling water circulation device and an oil recovery tank.

[0018] Furthermore, the intelligent integrated control subsystem four includes a temperature sensor, a pressure sensor, a single-chip microcomputer and its control system. The temperature sensor is arranged between the material transmission chain plate and the high-temperature heat radiation tube, the pressure sensor is arranged on the top of the chain plate type indirect pyrolysis furnace, and the pressure sensor is arranged next to the pyrolysis gas outlet of the chain plate type indirect pyrolysis furnace. The single-chip microcomputer and its control system are respectively connected to the burner pulse controller, the burner proportional valve controller, the gravity explosion-proof door, the spring-type automatic pressure relief safety valve, the high-precision induced draft fan, the temperature sensor and the pressure sensor.

[0019] The present invention has the following beneficial effects due to the adoption of the above technical solution:

[0020] 1. In the present invention, the combustion exhaust gas in the high-temperature heat radiation tube is passed through the insulation pipe into the feed conveying device with a heat exchange jacket and the discharge conveying device with a heat exchange jacket for heat exchange, and the distribution ratio can be adjusted according to the ambient temperature and material processing needs to improve the thermal energy utilization rate of the entire system.

[0021] 2. In the present invention, the pyrolysis flue gas generated in the chain plate type indirect pyrolysis furnace is passed into the spray condensation solid water oil gas four-phase separation skid for treatment, the separated oil phase is sent to the recovery oil tank, the water phase is purified and reused, a small amount of solid phase is discharged and then processed, and the non-condensable gas can be reused after purification.

[0022] 3. The indirect pyrolysis system provided by the present invention can process a wide variety of sludge, has a large processing capacity, a high pollutant removal rate, recyclable oil, pyrolysis gas reuse, and a high resource utilization rate. The entire system operates in a closed oxygen-proof environment, which can avoid the production of highly carcinogenic pollutants such as dioxins.

[0023] 4. The present invention has the advantages of large output, low energy consumption, high thermal efficiency, and can achieve carbon emission reduction such as pyrolysis oil recovery and pyrolysis non-condensable gas reuse. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of an indirect pyrolysis system of the present invention;

[0025] Figure 2 It is a partial schematic diagram of the indirect pyrolysis system of the present invention.

[0026] In the attached drawings, 1-material transmission chain plate, 2-chain plate type indirect pyrolysis furnace, 3-nitrogen generator, 4-self-preheating burner, 5-low calorific value burner, 6-high temperature thermal radiation tube, 7-star-shaped air locking device, 8-feeding conveying device with heat exchange jacket, 9-discharging conveying device with heat exchange jacket, 10-insulation pipeline, 11-centrifugal blower, 12-spraying condensation solidification water oil and gas four-phase separation skid, 13-gas low-temperature heat exchanger, 14-molecular sieve gas purification device, 15-burner pulse controller, 16-burner proportional valve controller, 17-gravity explosion-proof door, 18-spring-type automatic pressure relief safety valve, 19-cooling water circulation device, 20-recovery oil tank, 21-high-precision induced draft fan, 22-turner, 23-temperature sensor, 24-pressure sensor, 25-single-chip microcomputer and its control system, 26-chimney, 27-high-temperature gas regulating valve. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and preferred embodiments. However, it should be noted that many details listed in the specification are only for the purpose of enabling the reader to have a thorough understanding of one or more aspects of the present invention, and these aspects of the present invention can be implemented even without these specific details.

[0028] like Figure 1-2As shown, a high-efficiency and low-consumption chain-plate type gas thermal radiation indirect pyrolysis system comprises a nitrogen-filled low-pressure chain-plate type pyrolysis subsystem 1, a self-preheating gas thermal radiation heat exchange subsystem 2, a pyrolysis gas graded condensation recovery and utilization subsystem 3 and an intelligent comprehensive control subsystem 4; the nitrogen-filled low-pressure chain-plate type pyrolysis subsystem 1 comprises a chain-plate type indirect pyrolysis furnace 2, a nitrogen generator 3, a feed conveying device 8 with a heat exchange jacket and a discharge conveying device 9 with a heat exchange jacket, the chain-plate type indirect pyrolysis furnace 2 is respectively connected to the nitrogen generator 3, the feed conveying device 8 with a heat exchange jacket and the discharge conveying device 9 with a heat exchange jacket, and a material transmission chain plate 1 is arranged inside the chain-plate type indirect pyrolysis furnace 2; the self-preheating gas thermal radiation heat exchange subsystem 2 comprises a self-preheating burner 4, a low calorific value burner 5, a high-temperature heat radiation tube 6 and A high-temperature gas regulating valve 27 and a high-temperature heat radiation tube 6 are arranged on the material transmission chain plate 1. The self-preheating burner 4 and the low calorific value burner 5 are respectively arranged on the high-temperature heat radiation tube 6 for supplying heat to the high-temperature heat radiation tube 6. The high-temperature gas regulating valve 27 is arranged on the top of the right side of the chain plate type indirect pyrolysis furnace 2. Two insulation pipes 10 are respectively connected to the high-temperature gas regulating valve 27. The pyrolysis gas graded condensation recovery and utilization subsystem three includes a spray condensation solid-water oil-gas four-phase separation skid 12 and a molecular sieve gas purification device 14. The spray condensation solid-water oil-gas four-phase separation skid 12 is connected to the chain plate type indirect pyrolysis furnace 2. The spray condensation solid-water oil-gas four-phase separation skid 12 is connected to the molecular sieve gas purification device 14 through a gas low-temperature heat exchanger 13. The molecular sieve gas purification device 14 is connected to the low calorific value burner 5 through a high-precision induced draft fan 21. The indirect pyrolysis system provided by the present invention can process a wide range of oil sludge types, has a large processing capacity, a high pollutant removal rate, can recover oil, reuse pyrolysis gas, and has a high resource utilization rate. The entire system operates in a closed oxygen-proof environment, which can avoid the generation of highly carcinogenic pollutants such as dioxins.

[0029] like Figure 1As shown, the feed conveying device 8 with a heat exchange jacket is arranged at the top left of the chain plate type indirect pyrolysis furnace 2, and the feed conveying device 8 with a heat exchange jacket is connected to the chain plate type indirect pyrolysis furnace 2 through a star-shaped air lock device 7, and is used for inputting materials with lower air permeability. The feed conveying device 8 with a heat exchange jacket is provided with a chimney 26, and the feed conveying device 8 with a heat exchange jacket is connected to the chimney 26 through a centrifugal blower 11. The material transmission chain plate 1 is transversely arranged inside the chain plate type indirect pyrolysis furnace 2, and is used for transmitting the materials input by the feed conveying device 8 with a heat exchange jacket to the discharge conveying device 9 with a heat exchange jacket for output, and a plurality of turners 22 are arranged on the material transmission chain plate 1. The discharge conveying device 9 with a heat exchange jacket is arranged at the bottom right of the chain plate type indirect pyrolysis furnace 2, and is connected to the chain plate type indirect pyrolysis furnace 2 through a star-shaped air lock device 7, and is used for outputting materials with lower air permeability. The nitrogen generator 3 is arranged on the left side of the chain plate type indirect pyrolysis furnace 2. The nitrogen generator 3 is connected to the chain plate type indirect pyrolysis furnace 2 through three evenly distributed pipe openings, and is used to introduce nitrogen with a purity greater than 99.9% into the furnace. The oily waste in the low-pressure chain plate type pyrolysis subsystem filled with nitrogen is transported by a screw conveyor 8 with a heat exchange jacket, and enters the chain plate type indirect pyrolysis furnace 2 through a star-shaped air lock conveying device 7 for pyrolysis treatment; the residence time of the material on the material transmission chain plate 1 in the chain plate type indirect pyrolysis furnace 2 is 15-150 minutes; the heat-treated material falls into the discharge conveyor 9 with a heat exchange jacket through the star-shaped air lock device 7.

[0030] In the nitrogen-filled low-pressure chain plate type pyrolysis subsystem 1, the oily waste is transported to the star-shaped air lock device 7 through the screw conveyor 8 with a heat exchange jacket to isolate most of the air, and then transported to the material conveying chain plate 1 of the chain plate type indirect pyrolysis furnace 2 for pyrolysis treatment. The transportation time is 5-15 minutes, during which the oily waste can be preheated to 120°C in the screw conveyor 8 with a heat exchange jacket. The high-temperature flue gas in the heat exchange jacket of the screw conveyor 8 with a heat exchange jacket comes from the tail gas after the combustion of natural gas in the high-temperature heat radiation tube 6 in the self-preheating gas heat radiation heat exchange subsystem 2. The heat-treated material falls into the discharging conveyor 9 output system with a heat exchange jacket through the star-shaped air lock device 7, and the output time is 3-15 minutes; during this period, the pyrolysis residue can be kept warm at 100-200°C in the discharging conveyor 9 with a heat exchange jacket, and the high-temperature flue gas in the heat exchange jacket of the discharging conveyor 9 with a heat exchange jacket comes from the tail gas after the natural gas is burned in the high-temperature heat radiation tube 6 in the self-preheating gas heat radiation heat exchange subsystem 2. The nitrogen generator 3 transports nitrogen to the chain-plate indirect pyrolysis furnace 2 through a pipeline connected to the chain-plate indirect pyrolysis furnace 2, providing a nitrogen environment isolated from oxygen in the chain-plate indirect pyrolysis furnace 2; the degassing high-precision induced draft fan 21 can lead the mixed gas in the chain-plate indirect pyrolysis furnace 2 to the pyrolysis gas graded condensation recovery and utilization subsystem 3, and the internal gas pressure in the chain-plate indirect pyrolysis furnace 2 can be controlled within 1kPa. The high-temperature heat radiation tube 6 of the self-preheating gas heat radiation heat exchange subsystem 2 heats the material in the chain plate type indirect pyrolysis furnace 2; the material heating temperature on the material transmission chain plate 1 in the chain plate type indirect pyrolysis furnace 2 can be controlled to fluctuate between the outside temperature of the furnace and ±10°C within 800°C; the high-temperature exhaust gas of the gas combustion is passed into the heat exchange jacket of the screw conveyor 8 with a heat exchange jacket of the nitrogen-filled low-pressure chain plate type pyrolysis subsystem 1 to preheat the material, or at the same time passed into the heat exchange jacket of the discharge conveyor 9 with a heat exchange jacket to keep the material warm.

[0031] like Figure 1-2As shown, a gravity explosion-proof door 17 is arranged on the top of the chain plate type indirect pyrolysis furnace 2, and a spring type automatic pressure relief safety valve 18 is arranged on the side of the chain plate type indirect pyrolysis furnace 2. The gravity explosion-proof door 17 and the spring type automatic pressure relief safety valve 18 are two pressure control devices. The starting pressure of the gravity explosion-proof door 17 is 3kPa, and the set pressure of the spring type automatic pressure relief safety valve 18 is 1kPa. A plurality of high-temperature heat radiation tubes 6 are arranged in parallel on the upper or lower side of the material transmission chain plate 1, and the self-preheating burner 4 and the low calorific value burner 5 are arranged at both ends of the high-temperature heat radiation tube 6, respectively. The self-preheating burner 4 is provided with a burner pulse controller 15, and the low calorific value burner 5 is provided with a burner proportional valve controller 16. The natural gas burner is a self-preheating burner 4 regulated by a burner pulse controller 15, and the pyrolysis non-condensable gas burner is a low calorific value burner 5 regulated by a burner proportional valve controller 16. The high temperature heat radiation tube 6 of the self-preheating gas heat radiation heat exchange subsystem II can be heated by burning natural gas by the self-preheating burner 4 regulated by the burner pulse controller 15, or by the low calorific value burner 5 regulated by the burner proportional valve controller 16 for burning pyrolysis non-condensable gas. One end of the two heat-insulating pipes 10 respectively extends out of the left and right ends of the chain plate type indirect pyrolysis furnace 2, and one end of the two heat-insulating pipes 10 is respectively connected to the feed conveying device 8 with a heat exchange jacket and the discharge conveying device 9 with a heat exchange jacket, so as to pass the high temperature tail gas into the heat exchange jackets of the feed conveying device 8 with a heat exchange jacket and the discharge conveying device 9 with a heat exchange jacket, and the amount of the passed-in amount can be adjusted between 0-100%. The high-temperature exhaust gas generated by the combustion of the self-preheating burner 4 in the self-preheating gas thermal radiation heat exchange subsystem 2 is distributed into the two insulated pipes 10 through the high-temperature gas regulating valve 27, and then respectively passes into the heat exchange jacket of the feed conveying device 8 with a heat exchange jacket and the heat exchange jacket of the discharge conveying device 9 with a heat exchange jacket. The distribution ratio of the two insulated pipes 10 can reach 0-100% of the total flue gas volume.

[0032] like Figure 1 As shown, the spray condensation solid-water oil-gas four-phase separation skid 12 is connected to the pyrolysis gas outlet of the chain plate type indirect pyrolysis furnace 2, and a cooling water circulation device 19 and an oil recovery tank 20 are arranged on the spray condensation solid-water oil-gas four-phase separation skid 12. The pyrolysis flue gas generated in the chain plate type indirect pyrolysis furnace 2 in the nitrogen-filled low-pressure chain plate type pyrolysis subsystem 1 is introduced into the spray condensation solid-water oil-gas four-phase separation skid 12 in the pyrolysis gas graded condensation recovery and utilization subsystem 3 for treatment, and the formed condensate is separated from the solid particles in the skid, the upper oil phase is sent to the oil recovery tank 20 for temporary storage, and the water phase is sent to the cooling water circulation device 19 for purification and cooling, and then reused in the spray condensation solid-water oil-gas four-phase separation skid 12, a small amount of solid particles are precipitated at the bottom, and discharged when the precipitate is large, and the pyrolysis non-condensable gas is further purified by the gas low-temperature heat exchanger 13 and the molecular sieve gas purification device 14, and finally reused for combustion in the low calorific value burner 5.

[0033] like Figure 2 As shown, the intelligent integrated control subsystem 4 includes a temperature sensor 23, a pressure sensor 24, a single-chip microcomputer and its control system 25, which can automatically control the operating time and power of the self-preheating burner 4 in the chain-plate type indirect pyrolysis furnace 2 according to the set temperature; the temperature sensor 23 is arranged between the material transmission chain plate 1 and the high-temperature heat radiation tube 6, and the control logic is that when the temperature of the temperature sensor 23 in the chain-plate type indirect pyrolysis furnace 2 is lower than the set temperature, the self-preheating burner 4 is turned on for ignition heating, and when it is higher than the set temperature, the heating is stopped. The pressure sensor 24 is arranged on the top of the chain plate type indirect pyrolysis furnace 2, and the pressure sensor 24 is arranged next to the pyrolysis gas outlet of the chain plate type indirect pyrolysis furnace 2. The control logic is that when the pressure in the chain plate type indirect pyrolysis furnace 2 is greater than 1kPa, the pyrolysis gas high-precision induced draft fan 21 is started to reduce the pressure in the furnace. The single-chip microcomputer and its control system 25 are respectively connected to the burner pulse controller 15, the burner proportional valve controller 16, the gravity-type explosion-proof door 17, the spring-type automatic pressure relief safety valve 18, the high-precision induced draft fan 21, the temperature sensor 23 and the pressure sensor 24. The control logic of the temperature sensor 23, the burner pulse controller 15 and the burner proportional valve controller 16 is controlled by the single-chip microcomputer and its control system 25, and the frequency control logic of the pressure sensor 24, the gravity-type explosion-proof door 17, the spring-type automatic pressure relief safety valve 18 and the high-precision induced draft fan 21 is controlled by the single-chip microcomputer and its control system 25.

[0034] In the intelligent integrated control subsystem four, the temperature sensor 23 can automatically control the pulse start and shut down of the self-preheating burner 4 in the self-preheating gas thermal radiation heat exchange subsystem two and the power of the calorific value burner 5 according to the setting, thereby controlling the temperature in the chain-plate type indirect pyrolysis furnace 2; the pressure sensor 24 can automatically control the frequency of the pyrolysis gas high-precision induced draft fan 21 in the pyrolysis gas graded condensation and recovery subsystem three according to the setting, thereby controlling the gas pressure in the chain-plate type indirect pyrolysis furnace 2, and the activation of the spring-type automatic pressure relief safety valve 18 can increase the frequency of the pyrolysis gas high-precision induced draft fan 2 in the pyrolysis gas graded condensation and recovery subsystem three, thereby reducing the gas pressure in the chain-plate type indirect pyrolysis furnace 2; the activation of the gravity-type explosion-proof door 17 can shut down the combustion and heating function of the self-preheating gas thermal radiation heat exchange subsystem two and increase the frequency of the pyrolysis gas high-precision induced draft fan 21 in the pyrolysis gas graded condensation and recovery subsystem three.

[0035] How it works

[0036] When the system is running: first, turn on the nitrogen generator 3 to transport nitrogen to the chain-plate indirect pyrolysis furnace 2, forming a slightly positive pressure gas environment, and displacing the air in the chain-plate indirect pyrolysis furnace 2; turn on the self-preheating burner 4 using natural gas to heat the chain-plate indirect pyrolysis furnace 2. The temperature of each burner can be set individually, and different temperatures can be set according to the pyrolysis characteristics of the material to be pyrolyzed to form an optimal temperature field and improve the pyrolysis efficiency of the material; while heating, adjust the high-temperature gas regulating valve 27 so that all the high-temperature exhaust gas generated by the combustion of natural gas is passed into the feeding and conveying device 8 with a heat exchange jacket and heated at the same time. When the chain-plate indirect pyrolysis furnace 2 reaches the required temperature, feeding can be started; at the same time, turn on the pyrolysis gas graded condensation and recycling subsystem three. According to the ambient temperature requirements, the high-temperature gas regulating valve 27 can be adjusted to allow part of the high-temperature flue gas to enter the heat exchange jacket. The jacket is heated in the discharge conveying device 9; when the material begins to pyrolyze, the generation of pyrolysis gas will increase the gas pressure in the chain plate type indirect pyrolysis furnace 2. At this time, the amount of nitrogen introduced can be reduced, or the nitrogen introduction can be stopped to maintain a suitable micro-positive pressure gas environment in the chain plate type indirect pyrolysis furnace 2; when the material continues to pyrolyze to form a stable pyrolysis non-condensable gas, the low calorific value burner 5 regulated by the burner pulse controller 15 can be turned on; the number and proportion of the self-preheating burners 4 and the low calorific value burners 5 in the system can be set according to the calorific value or other characteristics of the pyrolysis non-condensable gas generated by the pyrolysis material, the high-temperature heat radiation tube 6 is parallel to the material transmission chain plate 1, and the distance between the high-temperature heat radiation tube 6 and the material transmission chain plate 1 can be determined according to the thickness of the pyrolysis material. The high-temperature heat radiation tube 6 can be in the form of I-type, U-type or W-type, and can be placed above, below, or above and below the material transmission chain plate 1. In addition, the low calorific value burner 5 regulated by the burner pulse controller 15 can also use natural gas or biogas combustion for heating alone or simultaneously, and can be set according to the calorific value of the pyrolysis non-condensable gas generated by the pyrolysis material. When the calorific value of the pyrolysis non-condensable gas generated by the pyrolysis material is small or unstable, the two types of fuel gas can be used in proportion. When the pyrolysis non-condensable gas generated by the pyrolysis material is sufficient, the low calorific value burner 5 does not need to use other fuel gases, and the frequency of natural gas use of the self-preheating burner 4 will also decrease accordingly, thereby achieving the purpose of energy saving.

[0037] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high-efficiency and low-consumption chain plate type gas heat radiation indirect pyrolysis system, characterized by: It includes a nitrogen-filled low-pressure chain plate type pyrolysis subsystem 1, a self-preheating gas heat radiation heat exchange subsystem 2, a pyrolysis gas graded condensation recovery and utilization subsystem 3 and an intelligent comprehensive control subsystem 4; A nitrogen-filled low-pressure chain plate type pyrolysis subsystem comprises a chain plate type indirect pyrolysis furnace (2), a nitrogen generator (3), a feed conveying device with a heat exchange jacket (8), and a discharge conveying device with a heat exchange jacket (9); the chain plate type indirect pyrolysis furnace (2) is connected to the nitrogen generator (3), the feed conveying device with a heat exchange jacket (8), and the discharge conveying device with a heat exchange jacket (9), respectively; and a material transmission chain plate (1) is arranged inside the chain plate type indirect pyrolysis furnace (2); The second self-preheating gas heat radiation heat exchange subsystem comprises a self-preheating burner (4), a low calorific value burner (5), a high temperature heat radiation tube (6) and a high temperature gas regulating valve (27); the high temperature heat radiation tube (6) is arranged on the material transmission chain plate (1); the self-preheating burner (4) and the low calorific value burner (5) are respectively arranged on the high temperature heat radiation tube (6) for supplying heat to the high temperature heat radiation tube (6); the high temperature gas regulating valve (27) is arranged on the top of the right side of the chain plate type indirect pyrolysis furnace (2); and two insulation pipes (10) are respectively connected to the high temperature gas regulating valve (27); The pyrolysis gas graded condensation recovery and utilization subsystem three comprises a spray condensation solid-water oil-gas four-phase separation skid (12) and a molecular sieve gas purification device (14); the spray condensation solid-water oil-gas four-phase separation skid (12) is connected to a chain plate type indirect pyrolysis furnace (2); the spray condensation solid-water oil-gas four-phase separation skid (12) is connected to the molecular sieve gas purification device (14) via a gas low-temperature heat exchanger (13); and the molecular sieve gas purification device (14) is connected to a low calorific value burner (5) via a high-precision induced draft fan (21).

2. According to claim 1, a high-efficiency and low-consumption chain plate type gas heat radiation indirect pyrolysis system is characterized by: A feed conveying device (8) with a heat exchange jacket is arranged at the top left side of the chain plate type indirect pyrolysis furnace (2). The feed conveying device (8) with a heat exchange jacket is connected to the chain plate type indirect pyrolysis furnace (2) via a star-shaped air lock device (7) and is used for inputting materials with a relatively low air permeability. A chimney (26) is arranged on the feed conveying device (8) with a heat exchange jacket. The feed conveying device (8) with a heat exchange jacket is connected to the chimney (26) via a centrifugal blower (11).

3. According to claim 1, a high-efficiency and low-consumption chain plate type gas heat radiation indirect pyrolysis system is characterized by: The discharge conveying device (9) with a heat exchange jacket is arranged at the bottom end of the right side of the chain plate type indirect pyrolysis furnace (2). The discharge conveying device (9) with a heat exchange jacket is connected to the chain plate type indirect pyrolysis furnace (2) through a star-shaped air locking device (7) and is used to output materials with lower air permeability.

4. According to claim 1, a high-efficiency and low-consumption chain plate type gas heat radiation indirect pyrolysis system is characterized by: The nitrogen generator (3) is arranged on the left side of the chain plate type indirect pyrolysis furnace (2). The nitrogen generator (3) is connected to the chain plate type indirect pyrolysis furnace (2) through three evenly distributed pipe openings and is used to introduce nitrogen with a purity greater than 99.9% into the furnace.

5. According to claim 1, a high-efficiency and low-consumption chain plate type gas heat radiation indirect pyrolysis system is characterized by: A gravity-type explosion-proof door (17) is arranged on the top of the chain-plate type indirect pyrolysis furnace (2), and a spring-type automatic pressure relief safety valve (18) is arranged on the side of the chain-plate type indirect pyrolysis furnace (2).

6. The high-efficiency and low-consumption chain plate type gas heat radiation indirect pyrolysis system according to claim 1 is characterized by: The material transmission chain plate (1) is transversely arranged inside the chain plate type indirect pyrolysis furnace (2) and is used to transmit the material input by the feeding conveying device (8) with a heat exchange jacket to the discharging conveying device (9) with a heat exchange jacket for output. A plurality of material turners (22) are arranged on the material transmission chain plate (1).

7. The high-efficiency and low-consumption chain plate type gas heat radiation indirect pyrolysis system according to claim 1 is characterized by: A plurality of high-temperature heat radiation tubes (6) are arranged in parallel on or below a material conveying chain plate (1); a self-preheating burner (4) and a low calorific value burner (5) are arranged at both ends of the high-temperature heat radiation tube (6), respectively; a burner pulse controller (15) is arranged on the self-preheating burner (4), and a burner proportional valve controller (16) is arranged on the low calorific value burner (5).

8. The high-efficiency and low-consumption chain plate type gas heat radiation indirect pyrolysis system according to claim 1 is characterized by: One end of the two heat-insulating pipes (10) respectively extends out of the left and right ends of the chain plate type indirect pyrolysis furnace (2), and one end of the two heat-insulating pipes (10) is respectively connected to a feed conveying device (8) with a heat exchange jacket and a discharge conveying device (9) with a heat exchange jacket, so as to pass high-temperature exhaust gas into the heat exchange jackets of the feed conveying device (8) with a heat exchange jacket and the discharge conveying device (9) with a heat exchange jacket.

9. The high-efficiency and low-consumption chain plate type gas heat radiation indirect pyrolysis system according to claim 1 is characterized by: The spray condensation solid water oil gas four-phase separation skid (12) is connected to the pyrolysis gas outlet of the chain plate type indirect pyrolysis furnace (2), and the spray condensation solid water oil gas four-phase separation skid (12) is provided with a cooling water circulation device (19) and an oil recovery tank (20).

10. The high-efficiency and low-consumption chain plate type gas heat radiation indirect pyrolysis system according to claim 1, characterized in that: The intelligent integrated control subsystem 4 includes a temperature sensor (23), a pressure sensor (24), a single-chip microcomputer and a control system (25). The temperature sensor (23) is arranged between the material transmission chain plate (1) and the high-temperature heat radiation tube (6). The pressure sensor (24) is arranged on the top of the chain plate type indirect pyrolysis furnace (2), and the pressure sensor (24) is arranged next to the pyrolysis gas outlet of the chain plate type indirect pyrolysis furnace (2). The single-chip microcomputer and the control system (25) are respectively connected to the burner pulse controller (15), the burner proportional valve controller (16), the gravity explosion-proof door (17), the spring-type automatic pressure relief safety valve (18), the high-precision induced draft fan (21), the temperature sensor (23) and the pressure sensor (24).

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