A solar-heated chlorine-containing plastic and high-alkali carbon-containing matrix molten salt co-gasification device and method

Abstract

The present invention provides a solar-heated chlorine-containing plastic and high-alkali carbon-containing matrix molten salt co-gasification device and method. The device includes a solar molten salt heating device, a solar gasifier heating device, and a molten salt gasifier. The molten salt gasifier includes a hollow furnace body, a material pretreatment device, and a rotary distributor. The rotary distributor includes a vertical central axis and a plurality of one-way nozzles distributed on the sides of the central axis, and the one-way nozzles can rotate with the central axis. The chlorine-containing plastic pretreated by the material pretreatment device and the high-alkali carbon-containing matrix mixture, along with the gasifier heated by the solar gasifier heating device, enter the central axis and are then sprayed out by the one-way nozzles. The molten salt heated by the solar molten salt heating device is transported to the interior of the furnace body to provide heat for the gasification reaction of the materials in the furnace. During this process, the chlorine element combines with alkali and alkaline earth metals to form harmless metal salts that are transferred to the molten salt. The device can fully utilize solar energy as a heat source and simultaneously achieve efficient and clean conversion of waste plastics and high-alkali carbon-containing matrix.

Description

Technical Field

[0001] The present invention relates to the technical field of gasification engineering, and in particular to a solar-heated co-gasification device and method for chlorine-containing plastic and high-alkali carbon-containing matrix molten salt. Background Art

[0002] Energy is the material foundation and crucial underpinning of human social development and progress. However, the widespread use of fossil fuels such as coal and oil has resulted in significant emissions of pollutants and greenhouse gases. Therefore, we must vigorously develop and utilize renewable energy to gradually replace traditional fossil fuels and promote a clean, low-carbon, and green energy transition.

[0003] High-temperature gasification of carbon-containing wastes such as chlorinated plastics and biomass can produce syngas, which can be used to prepare clean fuels and fine chemicals, gradually replacing fossil energy. However, chlorinated plastics contain large amounts of chlorine. When using traditional gasification technology to gasify chlorinated plastics, the chlorine is ultimately converted into hydrogen chloride, causing corrosion in equipment and pipelines. Biomass typically has a high content of alkali and alkaline earth metals. During the gasification of highly alkaline carbon-containing substrates, alkali and alkaline earth metals accelerate erosion in the gasifier, affecting the long-term stable operation of the gasification unit. The prior art discloses a method and apparatus for treating waste printed circuit boards and a gasifying agent using a molten salt gasifier. Crushed waste printed circuit board particles and a gasifying agent are mixed, heated, and gasified in molten salt at 900-1000°C. The gaseous product is cooled and purified to obtain clean synthesis gas. The halogens in the waste printed circuit boards react with the molten salt to generate stable and harmless inorganic salts, which are dissolved in water and recovered through a flash evaporator. The metals deposited at the bottom of the reactor are discharged and separated from the molten salt by quenching and recovered. However, this technology consumes a large amount of alkaline molten salt, requiring additional heat to heat the molten salt. In addition, the material is not in sufficient contact with the molten salt, resulting in limited reaction efficiency.

[0004] Currently, most of the gasifiers in commercial operation are self-heating. During the actual operation of the gasifier, it is usually necessary to introduce air and some materials to burn and release heat to provide heat for the gasification reaction. This not only reduces the gasification efficiency, but also increases carbon emissions. Summary of the Invention

[0005] In response to the above problems, the present invention provides a solar-heated molten salt co-gasification device and method for chlorine-containing plastics and high-alkali carbon-containing matrixes, which fully utilizes solar energy as a heat source and simultaneously achieves efficient and clean conversion of waste plastics and high-alkali carbon-containing matrixes. Through a new material distribution system, the mass transfer of materials in the furnace is increased, and the occurrence of reactions in the furnace is enhanced, which is conducive to carbon reduction and emission reduction, and has both economic and environmental benefits.

[0006] The first aspect of the present invention provides a solar-heated chlorine-containing plastic and high-alkali carbon-containing matrix molten salt co-gasification device, comprising a solar molten salt heating device, a solar gasifier heating device and a molten salt gasifier; the molten salt gasifier comprises a hollow furnace body, a material pretreatment device and a rotary distributor vertically arranged inside the furnace body; the rotary distributor comprises a central axis perpendicular to the furnace body and a plurality of one-way nozzles distributed on the side of the central axis, and the one-way nozzles can rotate with the central axis; the material pretreatment device is connected to the upper part of the rotary distributor, and the chlorine-containing plastic and high-alkali carbon-containing matrix mixture pretreated by the material pretreatment device and the gasifier heated by the solar gasifier heating device enter the central axis together and are then ejected through the one-way nozzles; the solar molten salt heating device is connected to the bottom of the furnace body, and the heated molten salt is transported to the interior of the furnace body.

[0007] Preferably, a plurality of side pipes extending in the horizontal direction are provided on the side of the central axis of the rotary distributor, and the one-way nozzles are distributed below the side pipes.

[0008] Preferably, a plurality of side pipes are arranged around the central axis and disposed on the same horizontal plane to form a side pipe group; and a plurality of side pipe groups are arranged in the vertical direction.

[0009] Preferably, the side conduit is in the shape of a broken line, and at least one inflection point of the broken line is located at the top.

[0010] Preferably, the solar molten salt heating device comprises a first solar energy collecting device and a molten salt heating device, which utilizes solar energy to heat the molten salt to a specified molten salt temperature, and the heated molten salt is transported to the bottom of the molten salt gasifier;

[0011] Preferably, the solar gasifying agent heating device includes a second solar energy collecting device and a gasifying agent heating device, and utilizes solar energy to heat the gasifying agent to a specified gasifying agent temperature, and the heated gasifying agent is introduced into the molten salt gasifier.

[0012] Preferably, the designated temperature of the molten salt is 700-950°C, and the designated temperature of the gasifying agent is 300-500°C.

[0013] Preferably, the first solar energy collection device is a tower-type solar energy collection device.

[0014] Preferably, the second solar energy collection device is a trough solar energy collection device.

[0015] Preferably, the material pretreatment device includes a material crushing mixer and a premixing channel. The material crushing mixer is used to mix the chlorine-containing plastic and the high-alkali carbon-containing matrix and crush them to a specified degree of fragmentation. The inlet end of the premixing channel is respectively connected to the material crushing mixer and the solar gasification agent heating device, and the outlet end is connected to the upper part of the rotary distributor.

[0016] Preferably, a molten salt inlet baffle extending downward is provided above the opening connecting the solar molten salt heating device to the bottom of the furnace body.

[0017] Preferably, the device further comprises a synthesis gas purification device; the synthesis gas purification device is connected to the upper part of the molten salt gasification furnace, and collects and purifies the synthesis gas generated in the furnace body.

[0018] Preferably, the device further comprises an ash separation device; the ash separation device is connected to the middle and upper part of the molten salt gasifier to separate the molten salt ash mixture after the reaction into molten salt and gasified ash, and the separated molten salt is returned to the solar molten salt heating device.

[0019] Preferably, the synthesis gas purification device comprises a cyclone dust collector and a gas cooler.

[0020] Preferably, an upwardly extending synthesis gas outlet baffle is provided below the opening connecting the synthesis gas purification device and the molten salt gasifier.

[0021] Preferably, a molten salt outlet baffle extending upward is provided below the opening where the ash separation device is connected to the molten salt gasifier.

[0022] A second aspect of the present invention provides a solar-heated co-gasification method for chlorine-containing plastics and high-alkali carbon-containing matrix molten salt, the method being accomplished using the apparatus described in the above technical solution; the method comprising the following steps:

[0023] S1, using solar energy to heat the molten salt to a specified temperature and transport it to the interior of the molten salt gasifier; using solar energy to heat the gasifying agent to a specified temperature; mixing the chlorine-containing plastic and the high-alkali carbon-containing matrix and crushing them to obtain a pretreated material; the above processes are not in any order;

[0024] S2, mixing the heated gasifying agent with the pretreated material to obtain a gas-material mixture, and conveying the gas-material mixture to the upper part of the central shaft of the rotary distributor. The gas-material mixture enters the central shaft and is ejected through a rotating unidirectional nozzle, reacting with the heated molten salt at the bottom to produce synthesis gas and ash;

[0025] S3, collecting synthesis gas from the upper part of the molten salt gasifier; collecting the molten salt ash mixture after the reaction from the upper part of the molten salt gasifier, recovering the molten salt and discharging the ash;

[0026] Steps S1 to S3 can be performed cyclically.

[0027] Preferably, the high alkaline carbon-containing matrix has an alkali metal and / or alkaline earth metal content higher than 0.5%, and a carbon atom content higher than 30%.

[0028] Preferably, the high-alkali carbonaceous matrix is ​​selected from biomass and / or high-alkali low-rank coal;

[0029] Preferably, the gasifying agent is selected from water vapor and / or carbon dioxide;

[0030] Preferably, the molten salt is selected from one or more of a binary alkali metal molten salt, a ternary alkali metal salt molten salt and an alkaline earth metal salt molten salt.

[0031] Preferably, the mass ratio of the chlorine-containing plastic to the high-alkali carbon-containing matrix molten salt is 1:1 to 1:20;

[0032] Preferably, the particle size of the pretreated material is 0.1 to 5 mm;

[0033] Preferably, the mass ratio of the gasifying agent to the pretreated material is 0.2 to 1.0:1;

[0034] Preferably, the rotation speed of the rotary distributor is 5 to 20 r / min;

[0035] Preferably, the spraying rate of the unidirectional nozzle is 0.2-10 kg / min.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] Solar energy is an ideal, clean and pollution-free energy source. The present invention successfully uses solar energy as a heat source for molten salt co-gasification, and further enhances the gasification efficiency of molten salt co-gasification by rotating the cloth. Chlorine-containing waste plastics and difficult-to-treat high-alkali carbon-containing matrices are carried by the gasifier through high-temperature molten salt to quickly generate synthesis gas and ash. The chlorine in the chlorine-containing waste plastics reacts with the alkali and alkali metals in the high-alkali carbon-containing matrix to generate harmless metal salts that are transferred to the molten salt, thus realizing the coupling of solar energy utilization and harmless disposal of organic solid waste, and effectively controlling secondary pollution in the process of resource utilization of high-chlorine and high-alkali carbon-containing materials, which is conducive to the optimization of my country's energy structure and the sustainable development of the ecological environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a schematic structural diagram of the solar-heated chlorine-containing plastic and high-alkali carbon-containing matrix molten salt co-gasification device of the present invention;

[0039] Figure 2 It is a top view of the rotary distributor;

[0040] Figure 3 It is a structural diagram of a one-way sprinkler;

[0041] Among them, 1 is a tower-type solar molten salt heating device, 2 is a molten salt inlet, 3 is a molten salt gasifier, 4 is a trough-type solar gasifier heating device, 5 is a material pretreatment device, 6 is a feed inlet, 7 is a rotary distributor, 8 is a one-way nozzle, 9 is a synthesis gas outlet, 10 is a synthesis gas purifier, 11 is a synthesis gas cooler, 12 is an ash outlet, 13 is an ash separator, 14 is a motor, 15 is a molten salt inlet baffle, 16 is a synthesis gas outlet baffle, 17 is a molten salt outlet baffle, 7-10 is a central axis, 7-20 is a side pipe, 7-21 is a side pipe inflection point, 8-10 is a one-way outlet, and 8-20 is a direction control panel. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the implementation methods of this application, not all of the implementation methods; and the structures shown in the accompanying drawings are merely schematic and do not represent physical objects. It should be noted that based on these embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field fall within the scope of protection of this application.

[0043] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0044] In the present invention, a "high-alkali carbon-containing matrix" refers to a matrix containing an alkali metal and / or alkaline earth metal content exceeding 0.5% and a carbon atom content exceeding 30%. The alkali metals include, but are not limited to, K and Na ions, and the alkaline earth metals include, but are not limited to, Ca and Mg. In some embodiments of the present invention, the high-alkali carbon-containing matrix may specifically be biomass and / or high-alkali coal, particularly high-alkali coal from the Zhundong region.

[0045] In the present invention, chlorine-containing plastics include but are not limited to one or more of polyvinyl chloride plastics, polychloroprene plastics and chlorinated polyvinyl chloride plastics. In some specific embodiments of the present invention, chlorine-containing plastics are mostly chlorine-containing waste plastics.

[0046] In the present invention, "synthesis gas" refers to a mixture containing carbon monoxide and hydrogen as main components.

[0047] like Figure 1-3As shown, the present invention provides a solar-heated co-gasification device for chlorine-containing plastics and high-alkali carbon-containing matrix molten salt, comprising a tower-type solar energy collection device 1, a trough-type solar gasifier heating device 4, a molten salt gasifier 3, a synthesis gas purification device and an ash separation device 13. The tower-type solar energy collection device 1 is used to heat the molten salt, the solar gasifier heating device 4 is used to heat the gasifier, a co-gasification reaction occurs in the molten salt gasifier 3, the synthesis gas purification device is used to purify and cool the generated synthesis gas, and the ash separation device 13 is used to separate the molten salt from the ash after the reaction to achieve recycling of the molten salt.

[0048] like Figure 1 As shown, the molten salt gasifier 3 of the present invention includes a hollow furnace body, a material pretreatment device 5, a rotary distributor 7 vertically arranged inside the furnace body, and a motor 14 for controlling the rotation of the rotary distributor 7. The rotary distributor 7 includes a central axis perpendicular to the furnace body, and a plurality of one-way nozzles 8 distributed on the side of the central axis, and the one-way nozzles 8 can rotate with the central axis; the central axis is hollow and closed at the bottom, and the top of the central axis is vertically connected to the motor 14. A feed channel is provided on the side of the top of the central axis, and the feed channel extends outward from the upper part of the furnace body, and its far end is a feed port 6. The gas mixture obtained by mixing the gasifying agent with the pretreated material enters the central axis from the feed port 6. As shown Figure 1 、 2 As shown, in some specific embodiments of the present invention, side pipes 7-20 extending horizontally are cross-shapedly arranged on the side of the central axis 7-10 in the same horizontal direction to form a side pipe group, and several side pipe groups are arranged in the vertical direction of the central axis; each side pipe 7-20 is a two-section broken line shape, and the inflection point 7-21 of the broken line side pipe is located at the top of the side pipe, and several one-way nozzles 8 are arranged at the bottom of the side pipe. Figure 3 The structure of the one-way nozzle 8 of the present invention is shown. A one-way opening 8-10 is provided below the side pipe 7-20, and a direction control plate 8-20 is provided above and to the side of the one-way opening 8-10. The one-way opening and the direction control plate cooperate to direct the ejected gas mixture in a specified direction. The present invention distributes material through a rotating distributor, which greatly improves mass transfer between material particles within the furnace and between material particles and molten salt, enhancing the occurrence of gasification reactions and promoting the combination of chlorine with alkali and alkali metals.

[0049] In the present invention, the material pretreatment device can be arranged outside the furnace body. The material pretreatment device includes a material crushing mixer 5 and a premixing channel. The material crushing mixer 5 is used to mix the chlorine-containing plastic and the high-alkali carbon-containing matrix and crush them to a specified degree of crushing. The inlet end of the premixing channel is respectively connected to the material crushing mixer 5 and the solar gasification agent heating device 4, and the outlet end is connected to the feed port 6 of the feed channel located on the upper part of the rotary distributor.

[0050] like Figure 1As shown, the tower-type solar molten salt heating device 1 of the present invention includes a tower-type solar energy collection device and a molten salt heating device. It utilizes solar energy to heat the molten salt to a specified molten salt temperature, and the heated molten salt is then transported to the interior of the molten salt gasification furnace. In some specific embodiments of the present invention, the specified molten salt temperature is 700-950°C. The tower-type solar molten salt heating device 1 introduces the heated molten salt into the furnace body through a molten salt inlet 2 disposed at the bottom of the furnace body. In some preferred embodiments, a downwardly extending molten salt inlet baffle 15 is provided above the intersection of the molten salt inlet and the inner wall of the furnace body to prevent reactants from entering the tower-type solar molten salt heating device 1.

[0051] like Figure 1 As shown, the trough-type solar molten salt heating device 4 of the present invention includes a trough-type solar energy collection device and a gasifying agent heating device. The gasifying agent is heated to a specified gasifying agent temperature using solar energy, and the heated gasifying agent is then passed into the molten salt gasifier. In some specific embodiments of the present invention, the specified gasifying agent temperature is 300-500°C.

[0052] like Figure 1 The syngas purification device of the present invention includes a cyclone dust collector 10 and a gas cooler 11. The cyclone dust collector 10 removes dust and purifies the syngas collected within the furnace. The purified syngas then enters the syngas cooler 11, where it undergoes heat exchange to produce clean syngas. The syngas purification device is connected to the upper portion of the furnace, where the connection forms the syngas outlet 9. In some preferred embodiments, an inwardly and upwardly extending syngas outlet baffle 16 is provided at the lower end of the connection between the syngas outlet 9 and the inner wall of the furnace to prevent splashing molten salt or materials from entering the syngas purification device.

[0053] like Figure 1 As shown, the ash separation device of the present invention is connected to the upper middle portion of the molten salt gasifier to separate (e.g., filter) the reacted ash into molten salt and gasified ash. The separated molten salt is then fed back to the solar molten salt heating device. In some preferred embodiments of the present invention, a molten salt outlet baffle 17 extending inward and upward is provided at the lower end of the ash separation device where it connects to the inner wall of the furnace body to prevent unreacted material from entering the ash separation device.

[0054] The present invention also provides a solar-heated co-gasification method for chlorine-containing plastics and high-alkali carbon-containing matrix molten salt, which is accomplished using the device described in the above technical solution; the method comprises the following steps:

[0055] (1) Pretreatment:

[0056] The molten salt is heated to 700-950°C by the tower solar heating device 1, and the heated molten salt is transported from the molten salt inlet 2 to the molten salt gasifier 3 for heat supply for the material gasification reaction. The molten salt used can be a conventional binary or ternary molten salt in the art.

[0057] The gasifying agent is preheated to 300-500° C. by the trough solar heating system 4 . The gasifying agent includes but is not limited to water vapor, carbon dioxide, or a mixture of water vapor and carbon dioxide.

[0058] The waste plastic and the high-alkali carbon-containing matrix are crushed and evenly mixed by the material crusher mixer 5 to obtain a pretreated material.

[0059] The above steps are in no particular order.

[0060] (2) The pretreated material is transported to the rotary distributor 7 under the influence of the preheated gasifying agent and is sprayed into the hot molten salt through the one-way nozzles 8 distributed on the rotary distributor. The molten salt inlet baffle 15 can prevent the reactant particles sprayed into the molten salt from entering the molten salt inlet 2, and the molten salt outlet baffle 17 can prevent the reactant particles from entering the molten salt outlet 12.

[0061] (3) The material injected into the hot molten salt is heated by the molten salt and then reacts with the gasifying agent to generate synthesis gas, which is released to the top of the molten salt gasifier in the form of bubbles.

[0062] (4) Post-processing:

[0063] The synthesis gas generated by the reaction enters the synthesis gas purifier 10 through the synthesis gas outlet 9 for dust removal and purification, and then enters the synthesis gas cooler 10 for heat exchange and cooling to obtain clean synthesis gas. The synthesis gas outlet baffle 16 can prevent splashing molten salt from entering the synthesis gas outlet 9. The rotary distributor 7 rotates under the drive of the motor 14, so that the material, gasifying agent and high-temperature molten salt in the furnace can fully transfer heat and mass.

[0064] During the molten salt gasification process, chlorine in waste plastics combines with alkali and alkaline earth metals in the highly alkaline carbonaceous matrix to form stable, harmless metal salts, which are then transferred into the molten salt, forming ash containing the molten salt. The ash, carried by the molten salt, exits the molten salt gasifier 3 through the molten salt outlet 12 and enters the gasification ash separator 13 for filtration and removal. The cooled molten salt is then circulated into the tower solar heating system 1 for further heating.

[0065] The above steps can be repeated.

[0066] 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 principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A solar-heated chlorine-containing plastic and high-alkali carbon-containing matrix molten salt co-gasification device, characterized in that: It includes a solar molten salt heating device, a solar gasifying agent heating device and a molten salt gasifier; The molten salt gasifier includes a hollow furnace body, a material pre-treatment device and a rotary distributor vertically arranged inside the furnace body; The rotary distributor includes a central axis perpendicular to the furnace body, with a plurality of side pipes extending horizontally arranged on the sides of the central axis, and one-way nozzles distributed below the side pipes; multiple side pipes are arranged around the central axis and arranged on the same horizontal plane, forming a side pipe group; a plurality of side pipe groups are arranged in the vertical direction; the side pipes are in the shape of a broken line, and at least one inflection point of the broken line is located at the top of the side pipe; the one-way nozzles rotate with the central axis; The structure of the one-way nozzle is as follows: a one-way opening is provided below the side pipe, and a direction control plate is provided below the side of the one-way opening. The one-way opening and the direction control plate cooperate to make the gas mixture sprayed in a specified direction; The material pretreatment device includes a material crushing mixer and a premixing channel. The material crushing mixer is used to mix the chlorine-containing plastic and the high-alkali carbon-containing matrix and crush them to a specified degree of crushing. The inlet end of the premixing channel is respectively connected to the material crushing mixer and the solar gasification agent heating device, and the outlet end is connected to the upper part of the rotary distributor. The chlorine-containing plastic and the high-alkali carbon-containing matrix mixture pretreated by the material pretreatment device and the gasifying agent heated by the solar gasifying agent heating device enter the central shaft together and are then sprayed out through the one-way nozzle; The solar molten salt heating device is connected to the bottom of the furnace body, and the heated molten salt is transported to the inside of the furnace body.

2. The device according to claim 1, characterized in that The solar molten salt heating device includes a first solar energy collecting device and a molten salt heating device, which utilizes solar energy to heat the molten salt to a specified molten salt temperature, and the heated molten salt is transported to the interior of the molten salt gasifier; The solar gasifier heating device comprises a second solar energy collecting device and a gasifier heating device, which utilizes solar energy to heat the gasifier to a specified temperature of the gasifier, and the heated gasifier is introduced into the molten salt gasifier.

3. The device according to claim 2, characterized in that The specified temperature of molten salt is 700~950℃, and the specified temperature of gasifying agent is 300~500℃.

4. The device according to claim 2 or 3, characterized in that The first solar energy collection device is a tower-type solar energy collection device, and the second solar energy collection device is a trough-type solar energy collection device.

5. The device according to claim 1, 2 or 3, characterized in that A molten salt inlet baffle extending downward is provided above the opening connecting the solar molten salt heating device and the bottom of the furnace body.

6. The device according to claim 1, characterized in that The device also includes a synthesis gas purification device and / or an ash separation device; the synthesis gas purification device is connected to the upper part of the molten salt gasification furnace to collect and purify the synthesis gas generated in the furnace body; The ash separation device is connected to the middle and upper part of the molten salt gasifier to separate the molten salt ash mixture discharged from the gasifier into molten salt and gasified ash. The separated molten salt is returned to the solar molten salt heating device.

7. The device according to claim 6, characterized in that The synthesis gas purification unit includes a cyclone dust collector and a gas cooler.

8. The device according to claim 6 or 7, characterized in that An upwardly extending synthesis gas outlet baffle is provided below the opening where the synthesis gas purification device is connected to the molten salt gasifier; and / or an upwardly extending molten salt outlet baffle is provided below the opening where the ash separation device is connected to the molten salt gasifier.

9. A solar-heated co-gasification method for chlorine-containing plastics and high-alkali carbon-containing matrix molten salt, characterized in that: The method is performed using the device according to any one of claims 1 to 8; the method comprises the following steps: S1, using solar energy to heat the molten salt to a specified temperature and transport it to the interior of the molten salt gasifier; using solar energy to heat the gasifying agent to a specified temperature; mixing the chlorine-containing plastic and the high-alkali carbon-containing matrix and crushing them to obtain a pretreated material; the above processes are not in any order; The high-alkali carbon-containing matrix has an alkali metal and / or alkaline earth metal content higher than 0.5%, and a carbon atom content higher than 30%. The high-alkali carbon-containing matrix is ​​selected from biomass and / or high-alkali low-rank coal. The gasifying agent is selected from water vapor and / or carbon dioxide; The molten salt is selected from one or more of alkaline earth metal molten salts, binary alkali metal molten salts, and ternary alkali metal molten salts; The specified temperature of molten salt is 700-950℃, and the specified temperature of gasifying agent is 300-500℃; S2, mixing the heated gasifying agent with the pretreated material to obtain a gas-material mixture, conveying the gas-material mixture to the upper part of the central shaft of the rotary distributor, where the gas-material mixture enters the central shaft and is ejected through a rotating one-way nozzle. After being heated by the hot molten salt in the furnace, a gasification reaction occurs to generate synthesis gas and ash; The mass ratio of gasifying agent to pretreated material is 0.2 to 1.0:1; S3, collecting synthesis gas from the upper part of the molten salt gasifier; collecting the molten salt ash mixture after the reaction from the upper part of the molten salt gasifier, recovering the molten salt and discharging the ash; Steps S1 to S3 are performed in a loop.

10. The method according to claim 9, characterized in that Steps S1 and S2 also include one or more of the following conditions: (b) The particle size of the pretreated material is 0.1 to 5 mm; (d) The rotation speed of the rotary distributor is 5 to 20 r / min; (e) The spraying rate of the one-way nozzle is 0.2 to 10 kg / min.

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