Organic waste gasification melting treatment system and method

Abstract

The present application relates to organic waste gasification melting treatment system and method, including fluidized bed gasification treatment unit for carrying out fluidized bed gasification treatment of organic waste, ash melting treatment unit for carrying out melting treatment of ash, first channel, connecting ash melting treatment unit and fluidized bed gasification treatment unit, temperature adjusting device and air supply device, all are arranged on the first channel, the tail gas produced by melting treatment is adjusted by the temperature adjusting device and is transported by the air supply device, and the fluidized bed gasification treatment unit is formed for the fluidized bed gasification treatment of the fluidized wind.The organic waste gasification melting treatment system and method of the application use the tail gas as the fluidized wind of the fluidized bed gasification unit, so that the calorific value of the synthesis gas generated by the fluidized bed gasification unit gasification is significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to an organic waste gasification melting treatment system and method. BACKGROUND

[0002] The gasification melting treatment of organic waste is a new way of treating organic waste, which mainly aims to solve the problems of dioxin and heavy metal pollution in the treatment process. The gasification melting treatment mainly includes two main process stages, i.e. gasification of organic waste and melting of ash, and can be divided into direct gasification melting and indirect gasification melting according to whether the gasification and melting are carried out in two independent devices, wherein the indirect gasification melting is to carry out the gasification and melting in two devices respectively. The gasification of organic waste is to gasify the organic components in the organic waste at 500-900℃ to produce combustible synthesis gas, while the inorganic substances such as heavy metals are melted in the slag. The fly ash and slag (i.e. ash) produced in the process are subjected to melting incineration at a temperature higher than the melting temperature of the ash (generally higher than 1300℃), and after high-temperature melting, the heavy metals are solidified to form a glass body, realizing the harmless treatment of the heavy metals.

[0003] The aforementioned gasification of organic waste includes various processes such as fixed bed gasification process and fluidized bed gasification process. The fluidized bed gasification process selects a fluidized bed gasification furnace as the furnace type of the fluidized bed gasification furnace, uses air as the fluidizing wind medium, and uses water vapor as the gasification agent medium, so that the organic waste is in a fluidized and suspended state in the fluidized bed gasification furnace, thereby forming a good gas-solid contact environment in the furnace, fast heat transfer, and uniform temperature distribution, and further improving the gasification rate of the organic waste. The produced synthesis gas can be further used for boiler incineration to produce steam, and the produced water vapor can be used for power generation and system heat supply, etc.

[0004] However, in the aforementioned fluidized bed gasification process, although air is used as the fluidizing wind, it can also supplement oxygen during the gasification of the organic waste. However, in order to maintain good fluidization effect, the total amount of air introduced generally exceeds the amount of air required for oxygen supplementation, which causes problems such as low calorific value of the produced synthesis gas and large treatment capacity. SUMMARY

[0005] The present application has found that in the ash melting treatment unit of the organic waste treatment system, the tail gas produced by the melting treatment contains combustible gases such as CO and H2, contains water vapor which can be used as a gasification agent, contains a small amount of nitrogen, and almost does not contain oxygen, which is an ideal fluidizing wind medium in the fluidized bed gasification process. The present application utilizes the above finding to solve the problem of improving the calorific value of the synthesis gas produced by the gasification of the organic waste in the organic waste treatment system.

[0006] To achieve the above object, the first aspect of the present application provides an organic waste gasification melting treatment system, comprising:

[0007] a fluidized bed gasification treatment unit for fluidized bed gasification treatment of organic waste,

[0008] a slag melting treatment unit for melting treatment of slag,

[0009] a first channel connecting the slag melting treatment unit and the fluidized bed gasification treatment unit,

[0010] a temperature adjusting device and an air supply device, both arranged on the first channel,

[0011] the tail gas generated by the melting treatment is adjusted by the temperature adjusting device and transported by the air supply device through the first channel, to form fluidizing air for the fluidized bed gasification treatment in the fluidized bed gasification treatment unit.

[0012] In some embodiments of the first aspect of the present application, the temperature adjusting device is a waste heat boiler, which is connected to the fluidized bed gasification treatment unit through a first steam channel, and the steam generated by the waste heat boiler is sent to the fluidized bed gasification treatment unit through the first steam channel to be used as a gasification agent for the fluidized bed gasification treatment.

[0013] In some embodiments of the first aspect of the present application, the waste heat boiler is connected to the slag melting treatment unit through a second slag channel, and the slag of the waste heat boiler is sent to the slag melting treatment unit through the second slag channel for melting treatment.

[0014] In some embodiments of the first aspect of the present application, the fluidized bed gasification treatment unit is connected to a gas boiler through a synthesis gas channel, and the synthesis gas generated by the fluidized bed gasification treatment enters the furnace of the gas boiler for combustion.

[0015] In some embodiments of the first aspect of the present application, the gas boiler is connected to a steam power generation unit through a second steam channel, and the gas boiler sends steam to the steam power generation unit through the second steam channel for power generation.

[0016] In some embodiments of the first aspect of the present application, the gas boiler is connected to the slag melting treatment unit through a third slag channel, and the slag of the gas boiler is sent to the slag melting treatment unit through the third slag channel for melting treatment.

[0017] In some embodiments of the first aspect of the present application, the gas boiler is connected to a flue gas purification unit through a flue gas pipeline, and the flue gas formed after the combustion of the synthesis gas enters the flue gas purification unit through the flue gas channel for purification.

[0018] In some embodiments of the first aspect of the present application, the flue gas purification unit is connected to the ash melting treatment unit through a fly ash pipeline, and the fly ash in the flue gas purification unit is sent to the ash melting treatment unit through the fly ash pipeline for melting treatment.

[0019] In some embodiments of the first aspect of the present application, a heater is arranged in the flue gas purification unit, and the temperature adjusting device is a waste heat boiler, which is connected to the heater through a third steam channel, and the steam produced by the waste heat boiler is introduced into the heater through the third steam channel to heat the flue gas.

[0020] In some embodiments of the first aspect of the present application, the ash melting treatment unit comprises a drying device, a batching device, a conveying device and a melting device, and the ash is dried by the drying device and then batched by the batching device, and then sent to the melting device by the conveying device for melting.

[0021] In some embodiments of the first aspect of the present application, the fluidized bed gasification treatment unit comprises a fluidized bed gasification furnace and a cyclone separator, and the top of the fluidized bed gasification furnace is communicated with the top of the cyclone separator, and the bottom of the fluidized bed gasification furnace is communicated with the bottom of the cyclone separator.

[0022] The second aspect of the present application relates to an organic waste gasification and melting treatment method, comprising:

[0023] The organic waste is subjected to fluidized bed gasification treatment in the fluidized bed gasification treatment unit, and the ash is subjected to melting treatment in the ash melting treatment unit,

[0024] characterized in that:

[0025] The tail gas produced by the melting treatment is introduced into the fluidized bed gasification treatment unit through a first channel, adjusted by a temperature adjusting device and conveyed by a blowing device, to form a fluidizing air for the fluidized bed gasification treatment.

[0026] In some embodiments of the second aspect of the present application, the temperature adjusting device is a waste heat boiler, which produces steam by the heat of the tail gas, and the produced steam is introduced into the fluidized bed gasification unit as a gasification agent.

[0027] In some embodiments of the second aspect of the present application, the slag produced by the waste heat boiler is sent back to the ash melting treatment unit for melting treatment.

[0028] In some embodiments of the second aspect of the present application, the synthesis gas generated by the fluidized bed gasification treatment is used as fuel for a gas-fired boiler.

[0029] In some embodiments of the second aspect of the present application, the steam produced by the gas-fired boiler is used for steam power generation.

[0030] In some embodiments of the second aspect of the present application, the flue gas generated by the gas-fired boiler is sent to the flue gas purification unit for purification.

[0031] In some embodiments of the second aspect of the present application, the fly ash generated by the flue gas purification unit is sent to the ash melting treatment unit for melting treatment.

[0032] In some embodiments of the second aspect of the present application, the purification includes heating the flue gas in a heater, which is heated by water vapor generated by the tail gas of the ash melting treatment after heat exchange in a waste heat boiler.

[0033] In some embodiments of the second aspect of the present application, the ash is dried and proportioned before the melting treatment.

[0034] The organic waste gasification and melting treatment system and method of the present application use the tail gas as the fluidizing air of the fluidized bed gasification unit, which significantly increases the calorific value of the synthesis gas generated by the fluidized bed gasification unit. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 The flowchart of the fluidized bed gasification unit in the embodiment.

[0036] Figure 2 The flowchart of the gas-fired boiler in the embodiment.

[0037] Figure 3 The flowchart of the ash melting treatment unit in the embodiment.

[0038] Figure 4 The flowchart of the purification unit in the embodiment.

[0039] Figure 5 The flowchart of the waste heat utilization of the waste heat boiler and the gas-fired boiler in the embodiment.

[0040] In the figure: 1-plasma melting furnace, 2-waste heat boiler, 3-fluidized bed gasification furnace, 4-cyclone separator, 5-gas-fired boiler, 6-screw generator, 7-sludge dryer, 8-water treatment unit, 9-rotary kiln dryer, 10-first quench tower, 11-dry deacidification tower, 12-bag-type dust collector, 13-second quench tower, 14-heater, 15-second fan, 16-chimney, 17-first fan, 18-slag storage, 19-fly ash storage, 20-sludge storage, 21-accessory material storage, 22-screw feeder, 23-tail gas passage. DETAILED DESCRIPTION

[0041] The "unit" described in the present application is used to express the combination of devices, pipes, equipment, instruments, valves, etc. including but not limited to the devices, pipes, equipment, instruments, valves, etc. arranged to realize one or more process steps in the organic waste treatment.

[0042] The "system" described in the present application is used to express the combination of multiple units designed to realize the organic waste treatment.

[0043] The "channel" described in the present application not only includes the narrow sense of the pipe, but also the path inside the device for material transmission when other devices are connected with the pipe should be interpreted as part of the channel.

[0044] In the related examples of using fluidized bed reactors for combustion treatment of organic waste, although air is considered to be able to reduce the cost as the fluidizing air, the amount of fluidizing air will exceed the amount of air required for the whole combustion heat supply, causing the problems of high CO2 and N2 content in the synthesis gas, low heat value of the synthesis gas, and high tail gas amount, etc.

[0045] To solve the problem of improving the heat value of the synthesis gas formed by the gasification of the organic waste inside the organic waste treatment system, the present application provides an organic waste gasification and melting treatment system, comprising:

[0046] The fluidized bed gasification treatment unit is used for carrying out the fluidized bed gasification treatment of the organic waste,

[0047] The ash melting treatment unit is used for carrying out the melting treatment of the ash,

[0048] The first channel connects the ash melting treatment unit and the fluidized bed gasification treatment unit,

[0049] The temperature adjusting device and the air supply device are both arranged on the first channel,

[0050] The tail gas generated by the melting treatment is adjusted by the temperature adjusting device and transported by the air supply device through the first channel, to form the fluidizing air for the fluidized bed gasification treatment in the fluidized bed gasification treatment unit.

[0051] The above-mentioned processing system forms the fluidization air for fluidized bed reaction treatment by adjusting the high-temperature tail gas generated in the slag melting treatment process, and the slag melting treatment unit is used to treat the solid waste generated in the processing system, thereby forming a recycling of resources in the system. Compared with using air as the fluidization air medium, the fluidization air formed by the tail gas has unique advantages: first, the tail gas itself has a relatively high temperature, and the fluidization air formed thereby can provide a certain amount of heat for the fluidized bed gasification; second, the combustible components such as carbon monoxide and hydrogen contained in the tail gas can be used as fuel for the fluidized bed gasification, and the water vapor in the tail gas can be used as a gasification agent for the fluidized bed gasification; third, the tail gas itself contains less carbon dioxide and nitrogen and almost no oxygen, so that the calorific value of the synthesis gas generated after the organic waste gasification is higher; fourth, the carbon monoxide and hydrogen contained in the tail gas can provide a reducing atmosphere for the fluidized bed, thereby avoiding the generation of dioxin and reducing the burden of the subsequent purification process.

[0052] The above-mentioned temperature adjusting device is used to adjust the temperature of the tail gas in the first channel, so that the temperature of the tail gas is adjusted to a temperature suitable for being used as fluidization air. The temperature of the tail gas generated by the slag melting treatment process can be as high as 1200°C, so the temperature adjusting device for the tail gas generally performs a cooling treatment on the tail gas. After the tail gas is cooled to about 450°C to 550°C by the temperature adjusting device, it is sent into the fluidized bed gasification treatment unit. In some examples, the temperature of the tail gas can also be lower than the required temperature of the fluidization air. In this case, the temperature adjusting device can also be a heater. The temperature adjusting device that can be used includes but is not limited to various types of heat exchangers, coolers, and in some cases, a heater. The use of a heat exchanger can further utilize the waste heat of the tail gas. After the temperature adjustment, the tail gas is sent into the fluidized bed reactor by the air supply device to form the fluidization air. The air supply device that can be used includes but is not limited to a fan, a compressor, a pump, and the like.

[0053] Further, the temperature adjusting device preferably uses a waste heat boiler. The high-temperature tail gas in the slag melting treatment is cooled by heat exchange in the waste heat boiler, and the water in the waste heat boiler is heated by the high-temperature tail gas to form water vapor. The waste heat boiler also adjusts the temperature of the tail gas and produces water vapor as a byproduct. These water vapor can be further utilized, such as being used as a gasification agent for the fluidized bed gasification process or as a heat source in the system. In a specific structure, the high-temperature tail gas is cooled by the waste heat boiler and then sent into the fluidized bed gasification furnace at the bottom of the fluidized bed gasification unit by the air supply device to form the fluidization air, and the water vapor produced by the waste heat boiler is used as a gasification agent and is introduced into the bottom of the fluidized bed gasification furnace through the first steam channel.

[0054] In the process of cooling the high-temperature tail gas by the waste heat boiler, the solid particles entrained in the high-temperature tail gas are deposited at the bottom of the waste heat boiler to form slag. In order to treat the slag in the waste heat boiler, the waste heat boiler is connected with the ash melting treatment unit through a second slag channel, and the slag in the waste heat boiler is sent to the ash melting treatment unit through the second slag channel for melting treatment. Through the above structure, the slag in the waste heat boiler is properly treated in the system.

[0055] The fluidized bed gasification treatment unit is connected with the gas boiler through a synthesis gas channel, and the synthesis gas generated by the fluidized bed gasification treatment enters the hearth of the gas boiler through the synthesis gas channel for combustion and by-product water vapor. Further, the gas boiler is connected with the steam power generation unit through a second steam channel, and the gas boiler sends steam to the steam power generation unit through the second steam channel for power generation. Since the calorific value of the synthesis gas is improved, more steam is generated in the gas boiler, thereby increasing the power generation capacity. The gas boiler is connected with the ash melting treatment unit through a third slag channel, and the slag in the gas boiler is sent to the ash melting treatment unit through the third slag channel for melting treatment.

[0056] The gas boiler is connected with the flue gas purification unit through a flue gas pipeline, and the flue gas formed after the combustion of the synthesis gas enters the flue gas purification unit through the flue gas channel for purification. Further, the flue gas purification unit is connected with the ash melting treatment unit through a fly ash pipeline, and the fly ash in the flue gas purification unit is sent to the ash melting treatment unit through the fly ash pipeline for melting treatment. The flue gas purification unit is provided with a heater, and the temperature adjusting device adopts a waste heat boiler connected with the heater through a third steam channel. The steam generated by the waste heat boiler is introduced into the heater through the third steam channel to heat the flue gas, thereby heating and whitening the flue gas by using the steam generated by the waste heat boiler. The heat for heating and whitening is provided by the tail gas waste heat generated by the ash melting treatment unit, thereby reducing the energy consumption. In one specific structure of the flue gas purification unit, a first quenching tower, a dry deacidification tower, a bag-type dust collector, a second quenching tower, a whitening heater and a chimney are sequentially connected by a flue gas channel. The first quenching tower, the dry deacidification tower and the bag-type dust collector are connected with a fly ash storage through a fly ash channel, and the fly ash storage is connected with the ash melting device through a conveying device. The flue gas generated by combustion sequentially passes through the first quenching tower, the dry deacidification tower, the bag-type dust collector, the second quenching tower, the whitening device and the chimney for emission. The fly ash generated in the first quenching tower, the dry deacidification tower and the bag-type dust collector is sent to the fly ash storage for separation. The fly ash in the fly ash storage is sent to the ash melting treatment unit through the conveying device for melting treatment.

[0057] The ash melting treatment unit comprises a drying device, a batching device, a conveying device and a melting device. The ash is dried by the drying device and then is batched by the batching device, and then is sent into the melting device by the conveying device for melting. The ash melting treatment unit can be used to treat various fly ash and slag in the receiving system, and even can treat the slag not in the treatment system. The ash melting treatment unit can be adjusted according to the specific process unit in the treatment system. For example, the slag generated by the waste heat boiler, the fluidized bed gasification furnace and the gas boiler in the gasification melting treatment system can be dried by the same or different drying device, and then is batched with auxiliary materials in the batching device and is sent into the melting device for melting treatment. The fly ash in the purification unit in the gasification melting treatment system can be dried by the drying device, and then is batched with auxiliary materials in the batching device and is sent into the melting device for melting.

[0058] Figures 1 to 5 A specific organic waste treatment system is shown.

[0059] As Figure 1 shown, the main equipment in the fluidized bed gasification treatment unit of the embodiment includes the fluidized bed gasification furnace 33 and the cyclone separator 44 constituting the external circulation. The top of the fluidized bed gasification furnace 3 is communicated with the top of the cyclone separator 4, and the bottom of the cyclone separator 4 is communicated with the bottom of the fluidized bed gasification furnace 3. The unit is used to realize the combustion and gasification of the organic waste. The organic waste, air, fluidizing wind and gasification agent are respectively introduced into the fluidized bed gasification furnace 3 from the lower part to combust and gasify at a temperature of 800-850℃. The organic matter in the organic waste is decomposed into non-toxic synthesis gas of small molecules such as CO, H2 and CH4. The synthesis gas entrains solid particles and enters the cyclone separator from the top. After the solid particles are removed, the synthesis gas enters the gas boiler 5 for incineration. The solid particles are separated due to the centrifugal action and return to the fluidized bed gasification furnace 3 from the bottom of the cyclone separator 4 to deposit at the bottom to form slag. In the embodiment, the fluidizing wind and the gasification agent used in the fluidized bed gasification treatment unit can be produced by the organic waste treatment system. The main components of the obtained synthesis gas include CO 25%-55%, CO2 15%-20%, H2 10%-20%, H2O 10%-30%, N2 10%-28%, ash and a small amount of HCl, HF, SO2 and H2S. The heat value of the synthesis gas is 18%-35% higher than that of the synthesis gas produced by using air.

[0060] The formed synthesis gas and slag are respectively introduced into different units for treatment. The synthesis gas is incinerated in the gas boiler 5, and the flue gas after incineration is introduced into the purification unit for purification and then is discharged. The slag is introduced into the ash melting treatment unit for treatment.

[0061] AsFigure 3 As shown, the main equipment of the ash melting treatment unit includes a sludge dryer 7, a rotary kiln dryer 9, a slag storage silo 18, a fly ash storage silo 19, a sludge storage silo 20, an auxiliary material storage silo 21, a screw feeder 22, and a plasma melting furnace 1. The slag formed in the fluidized bed gasifier 3 is fed through a pipeline to the rotary kiln dryer 9 for drying, and then temporarily stored in the slag storage silo 18. Simultaneously, fly ash from the purification unit is fed through a pipeline to the fly ash storage silo 19 for temporary storage, and sludge from outside is dried by the sludge dryer 7 and then temporarily stored in the sludge storage silo 20. In addition, an auxiliary material storage silo 21 is provided for temporarily storing combustion aids, reducing agents, and other auxiliary materials. The slag storage silo 18, fly ash storage silo 19, sludge storage silo 20, and auxiliary material storage silo 21 are fed from the bottom to a screw feeder 22 for mixing before being fed into the plasma melting furnace 1 for melting treatment. The plasma melting furnace 1 uses a hollow graphite electrode at the top as the cathode, with N2 as the working gas. The anode is located at the bottom of the furnace. The working gas is partially ionized, generating plasma at temperatures above 5000°C. This plasma heats a mixture of slag, fly ash, sludge, and auxiliary materials, maintaining a molten state of 1400°C–1600°C. The molten liquid continuously overflows and is water-quenched to form a dense glassy substance (ionized rock). The ionized rock encapsulates heavy metals within a silicon-oxygen network structure. Ionized rock products with acceptable glass content and heavy metal leaching rates are sold externally, while substandard products are returned to the pretreatment system and re-entered into the furnace. The reduced alloy accumulates to a certain height and is periodically released from the furnace for refining by smelting companies. The exhaust gas from plasma melting furnace 1 has a temperature of 1200℃~1300℃. The main components of the exhaust gas from plasma melting furnace 1 are: CO 15%~40%, CO2 5%~10%, H2 11%~28%, H2O 12%~22%, N2 2%~7%, ash, and small amounts of HCl, HF, SO2, and H2S. It contains almost no O2, making it an ideal fluidizing air medium. Then, the exhaust gas from plasma melting furnace 1 enters waste heat boiler 2 and is cooled to 450℃~550℃. It is then blown into the bottom of fluidized bed gasifier 3 by a high-temperature fan to form fluidizing air. The ash and slag settled from waste heat boiler 2 are sent to rotary kiln dryer 9, where they are dried together with the slag from fluidized bed gasifier 3 and then sent to slag storage silo 18.

[0062] like Figure 2 As shown, after the syngas undergoes centrifugal separation of solid particles by a cyclone separator, it is fed into gas-fired boiler 5 and incinerated at 1200℃ for more than 2 seconds. Simultaneously, ammonia water is sprayed for SNCR denitrification to ensure that the nitrogen oxide content meets emission standards. The flue gas generated after incineration enters the purification unit for further treatment. Figure 4As shown, the main equipment of the flue gas purification unit in this embodiment includes a first quench tower 10, a dry desulfurization tower, a bag filter 12, a second quench tower 13, a whitening heater 14, a second fan 15, and a chimney 16. The flue gas from the gas-fired boiler 5 first enters the first quench tower 10 and is rapidly cooled to approximately 200°C (180°C in this embodiment) to prevent dioxin formation. Then, it enters the dry desulfurization tower where baking soda and activated carbon are added for dry desulfurization. The desulfurized flue gas then enters the bag filter 12 for dust removal, ensuring the dust content meets emission standards. Next, it enters the second quench tower 13 for wet desulfurization, further removing acidic substances such as SO2, HCl, HF, and SO3. Afterward, it enters the heater 14 for heating and whitening, and is then introduced into the chimney 16 by the induced draft fan before being discharged into the atmosphere. The fly ash collected by the first quench tower 10, the dry desulfurization tower 11, and the bag filter 12 is transported through pipelines to the fly ash storage silo 19.

[0063] In this system, the water supply for the waste heat boiler 2 and the gas-fired boiler 5 is achieved in the following manner. For example... Figure 5 As shown, the system includes a water treatment unit 8. Water from outside is desalinated by a demineralized water unit and then piped into a waste heat boiler 2 and a gas-fired boiler 5 for steam generation. In the waste heat boiler 2, the water absorbs heat from the 1200°C exhaust gas, generating 2.0 MPa supersaturated steam. This supersaturated steam is directed to: a) the bottom of a fluidized bed gasifier 3 as a gasifying agent; b) the organic waste inlet of the fluidized bed gasifier 3, also acting as a gasifying agent and facilitating the smooth entry of organic waste into the gasifier 3; and c) a heater 14 to heat and de-whiten the flue gas. The condensate, after heat exchange and cooling in the heater 14, returns to the water treatment unit 8 for further treatment and then participates in the circulation, flowing into the waste heat boiler 2 and the gas-fired boiler 5. In the gas-fired boiler 5, the water absorbs heat from the combustion of syngas, generating 2.0 MPa slightly superheated steam. This slightly superheated steam enters a screw generator 6, expands, and generates 400V electricity to power the plant's fans, pumps, and other equipment, as well as for lighting. The exhaust steam at 180℃@0.8MPa from the screw generator 6 serves as the heat source for the sludge dryer 7 and the rotary kiln dryer 9, drying wet sludge and wet slag. The condensate after heat exchange is also returned to the water treatment unit 8 for treatment and then continues to participate in the circulation, being fed into the waste heat boiler 2 and the gas boiler 5.

[0064] The embodiments described in this invention are for illustrative purposes only and do not constitute a limitation on the scope of the claims. Other substantially equivalent substitutions that can be conceived by those skilled in the art are all within the scope of protection of this invention.

Claims

1. An organic waste gasification and melting treatment system, comprising: a fluidized bed gasification treatment unit for carrying out fluidized bed gasification treatment of organic waste, including a fluidized bed gasification furnace, a slag melting treatment unit for carrying out melting treatment of slag, characterized in that it further comprises: a first channel connecting the slag melting treatment unit and the bottom of the fluidized bed gasification furnace, a temperature adjusting device and an air supply device, both arranged on the first channel, tail gas generated by the melting treatment is transported by the first channel, adjusted to 450-550℃ by the temperature adjusting device, and transported by the air supply device to form fluidizing air for fluidized bed gasification treatment at the bottom of the fluidized bed gasification furnace, the temperature adjusting device is a waste heat boiler, the waste heat boiler is connected to the fluidized bed gasification treatment unit through a first steam channel, and the steam generated by the waste heat boiler is sent to the fluidized bed gasification treatment unit through the first steam channel to be used as a gasification agent for fluidized bed gasification treatment.

2. The organic waste gasification and melt processing system of claim 1, wherein the waste heat boiler is connected to the slag melting treatment unit through a second slag channel, and the slag of the waste heat boiler is sent to the slag melting treatment unit through the second slag channel for melting treatment.

3. The organic waste gasification and melt processing system of claim 1, wherein the fluidized bed gasification treatment unit is connected to a gas boiler through a synthesis gas channel, and the synthesis gas generated by the fluidized bed gasification treatment enters the hearth of the gas boiler through the synthesis gas channel for combustion.

4. The organic waste gasification and melt processing system of claim 3, wherein the gas boiler is connected to a steam power generation unit through a second steam channel, and the gas boiler sends steam to the steam power generation unit through the second steam channel for power generation.

5. The organic waste gasification and melt processing system of claim 3, wherein the gas boiler is connected to the slag melting treatment unit through a third slag channel, and the slag of the gas boiler is sent to the slag melting treatment unit through the third slag channel for melting treatment.

6. The organic waste gasification and melt processing system of claim 3, wherein the gas boiler is connected to a flue gas purification unit through a flue gas pipeline, and the flue gas formed after the combustion of the synthesis gas enters the flue gas purification unit through the flue gas channel for purification.

7. The organic waste gasification and melt processing system of claim 6, wherein the flue gas purification unit is connected to the slag melting treatment unit through a fly ash pipeline, and the fly ash in the flue gas purification unit is sent to the slag melting treatment unit through the fly ash pipeline for melting treatment.

8. The organic waste gasification and melt processing system of claim 6, wherein a heater is arranged in the flue gas purification unit, the temperature adjusting device is a waste heat boiler, the waste heat boiler is connected to the heater through a third steam channel, and the steam generated by the waste heat boiler is introduced into the heater through the third steam channel to heat the flue gas.

9. The organic waste gasification and melt processing system of claim 1 wherein the slag melting treatment unit comprises a drying device, a batching device, a conveying device, and a melting device, and the slag is dried by the drying device and then batched by the batching device, and then sent to the melting device by the conveying device for melting.

10. The organic waste gasification and melt processing system of claim 1 wherein the fluidized bed gasification treatment unit further comprises a cyclone separator, the top of the fluidized bed gasification furnace is communicated with the top of the cyclone separator, and the bottom of the fluidized bed gasification furnace is communicated with the bottom of the cyclone separator.

11. An organic waste gasification and melting treatment method, comprising: carrying out fluidized bed gasification treatment of organic waste in a fluidized bed gasification furnace of a fluidized bed gasification treatment unit, and carrying out melting treatment of slag in a slag melting treatment unit, characterized in that: The tail gas generated by the melting treatment is sent by the first channel, adjusted to 450-550 DEG C by the temperature adjusting device and transported by the air supply device to form fluidizing air for the fluidized bed gasification treatment at the bottom of the fluidized bed gasification furnace, The temperature adjusting device is a waste heat boiler which generates steam by the heat of the tail gas, and the generated steam is used as the gasification agent in the fluidized bed gasification unit.

12. The method of claim 11, wherein the organic waste is gasified and melted by the plasma arc. 5 The slag generated by the waste heat boiler is sent back to the ash melting treatment unit for melting treatment.

13. The method for treating organic waste by gasification and melting as described in claim 11, characterized in that... The generated synthesis gas in the fluidized bed gasification treatment is used as the fuel of the gas boiler.

14. The method for treating organic waste by gasification and melting as described in claim 13, characterized in that... The generated steam of the gas boiler is used for steam power generation.

15. The method of claim 13, wherein the organic waste is gasified and melted by the plasma generated by the electric arc. 15 The flue gas generated by the gas boiler is sent to the flue gas purification unit for purification.

16. The method of claim 15, wherein the organic waste is gasified and melted. The fly ash generated by the flue gas purification unit is sent to the ash melting treatment unit for melting treatment.

17. The method of claim 15, wherein the organic waste is gasified and melted by the plasma arc torch. 0 The purification includes heating the flue gas in a heater, and the heater is heated by water vapor, and the water vapor is generated by the tail gas generated by the ash melting treatment and exchanged by the waste heat boiler.

18. The method of claim 11, wherein the organic waste is gasified and melted by the method. The ash is dried and proportioned before the melting treatment.

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