Hybrid organic solid waste and iron-containing waste aluminum upgrading coupled molten iron bath fuel gas system

Abstract

The application provides a mixed organic solid waste iron-containing waste aluminum upgrading coupled molten iron bath gas system, which is applied to waste aluminum remelting and regeneration, and comprises an aluminum-magnesium gas melting furnace, a centrifugal separator and a molten iron bath gasification furnace; volatile substances generated by waste plastics contained in waste aluminum through heat-free pyrolysis escape from the aluminum-magnesium gas melting furnace and are collected; solid waste aluminum and solid magnesium alloy are gradually melted in the aluminum-magnesium liquid pool and form an increased amount of the aluminum-magnesium liquid pool; the aluminum-magnesium liquid pool of the aluminum-magnesium gas melting furnace is a solid-liquid mixture composed of aluminum-magnesium alloy liquid and insoluble substances; the centrifugal separator is used for solid-liquid separation of the solid-liquid mixture to obtain aluminum-magnesium alloy filtrate and centrifugal residue, wherein the aluminum-magnesium alloy filtrate is input into a vacuum distillation furnace; the centrifugal residue and pure oxygen are input into the molten iron bath gasification furnace; the centrifugal residue input into the molten iron bath gasification furnace is melted and high-temperature gasified to obtain liquid iron, molten slag and synthesis gas, so that the synthesis gas is input into the aluminum-magnesium gas melting furnace (201) and used as fuel gas.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy, in particular to a mixed organic solid waste and iron-containing waste aluminum upgrading coupled molten iron bath gas system. BACKGROUND

[0002] Waste aluminum remelting and regeneration is an important metal resource and a way to obtain aluminum industry raw materials with lower carbon emissions than electrolytic primary aluminum. However, there are a large amount of solid waste such as waste plastic and harmful components such as waste iron mixed in the waste aluminum. Fine organic solid waste is not easy to mechanically separate in waste aluminum. After being added to the melting furnace, incomplete incineration of waste plastics and the like high polymers produces a large amount of smoke and toxic substances such as dioxin. At the same time, waste iron is difficult to effectively remove in molten aluminum liquid, and is often used by degradation or diluted by adding a large amount of clean fresh electrolytic aluminum liquid, causing waste of high-quality aluminum liquid. SUMMARY

[0003] The purpose of the present application is to provide a mixed organic solid waste and iron-containing waste aluminum upgrading coupled molten iron bath gas system which fully utilizes the components in waste aluminum and produces hydrogen gas as fuel gas.

[0004] To solve the above technical problems, the present application provides a mixed organic solid waste and iron-containing waste aluminum upgrading coupled molten iron bath gas system, which is applied to waste aluminum remelting and regeneration, and includes an aluminum-magnesium gas melting furnace, a centrifugal separator and a molten iron bath gasification furnace connected in sequence.

[0005] The aluminum-magnesium gas melting furnace contains molten aluminum-magnesium liquid. The outer wall of the aluminum-magnesium liquid pool of the aluminum-magnesium gas melting furnace is indirectly heated by the synthesis gas generated by the molten iron bath gasification furnace and external gas. Solid waste aluminum and solid magnesium alloy are input into the aluminum-magnesium liquid pool. The volatiles generated by the thermal pyrolysis of waste plastics contained in waste aluminum escape from the aluminum-magnesium gas melting furnace and are collected. The solid waste aluminum and the solid magnesium alloy gradually melt in the aluminum-magnesium liquid pool and form an additional amount of the aluminum-magnesium liquid pool. The aluminum-magnesium liquid pool of the aluminum-magnesium gas melting furnace is a solid-liquid mixture composed of aluminum-magnesium alloy liquid and insoluble matter.

[0006] The centrifugal separator is used for solid-liquid separation of the solid-liquid mixture to obtain aluminum-magnesium alloy filtrate and centrifugal residue. The aluminum-magnesium alloy filtrate is input into a vacuum distillation furnace.

[0007] The centrifugal residue and pure oxygen are input into the molten iron bath gasification furnace.

[0008] The centrifugal residue input into the molten iron bath gasification furnace is melted and high-temperature gasified to obtain liquid iron, molten slag and synthesis gas. The synthesis gas is input into the aluminum-magnesium gas melting furnace as fuel gas.

[0009] Further, the vacuum distillation furnace is used for distilling the aluminum-magnesium alloy filtrate to obtain magnesium vapor and aluminum liquid, magnesium elements volatilize from the vacuum distillation furnace into the magnesium vapor condenser to become crystalline magnesium, the crystalline magnesium enters the magnesium alloy remelting furnace to form magnesium liquid and is input into the magnesium alloy ingot casting machine, and the aluminum liquid is input from the vacuum distillation furnace into the aluminum liquid ingot casting machine.

[0010] Further, the aluminum-magnesium liquid melted in the aluminum-magnesium gas melting furnace, the aluminum-magnesium alloy filtrate containing aluminum more than 30% of mass fraction and containing magnesium more than 25% of mass fraction.

[0011] Further, the magnesium alloy condenser is connected with a vacuum pump on one side.

[0012] Further, the aluminum liquid downstream pipe and the aluminum liquid holding furnace are sequentially connected between the vacuum distillation furnace and the aluminum liquid ingot casting machine, so that the aluminum liquid flows into the aluminum liquid ingot casting machine.

[0013] Further, the oxygen-free pyrolysis products of the waste plastic contained in the waste aluminum are condensed to form pyrolysis oil and pyrolysis gas, and the pyrolysis oil and the pyrolysis gas are input into the molten iron bath gasification furnace for cracking gasification by the ejector.

[0014] Further, the pyrolysis oil is input into the heat exchange gasifier for gasification by the liquid booster pump, and then enters the ejector as the main injection gas, the ejector is used for extracting the pyrolysis gas to pressurize, and the pyrolysis gas is stored in the pyrolysis gas tank.

[0015] Further, the waste aluminum contains more than 1.5% of iron elements.

[0016] Further, the synthesis gas output from the molten iron bath gasification furnace is sequentially purified and discharged waste heat steam by the furnace gas cooling and dust removal unit, stored in the synthesis gas tank, and then input into the aluminum-magnesium gas melting furnace as fuel gas.

[0017] Further, the waste heat steam discharged from the furnace gas cooling and dust removal unit is input into the heat exchange gasifier to provide a heating source for re-evaporation of the pyrolysis oil.

[0018] The beneficial effects of the present application are:

[0019] 1. The solid residues separated by centrifugation contain various active metals, which, through the molten iron bath reaction condition, react with the difficult-to-treat sewage to generate hydrogen, and the hydrogen is returned to the aluminum-magnesium gas melting furnace and the distillation link to provide clean fuel gas energy.

[0020] 2. The waste plastic is subjected to oxygen-free pyrolysis through the aluminum-magnesium gas melting furnace, and then is completely gasified in the molten iron bath gasification furnace, and the gasification synthesis gas is returned to the aluminum-magnesium gas melting furnace and the distillation link to provide clean fuel gas energy.

[0021] 3. The iron elements in the waste aluminum are more than 1.5%, which are difficult to remove after being dissolved in the aluminum liquid, and can be removed more completely through this method.

[0022] 4, waste aluminum simple melting, melting point is above 660℃, by waste magnesium, large proportion of waste aluminum-waste magnesium melting, melting point is only 480℃, melting point is reduced, melting energy consumption is reduced a lot. BRIEF DESCRIPTION OF DRAWINGS

[0023] Fig. 1 is the flowchart of the present application.

[0024] Fig. 2 is the use schematic diagram of the centrifugal separator in the present application.

[0025] Fig. 3 is the connection schematic diagram between the aluminum-magnesium gas melting furnace and the vacuum distillation furnace in the present application.

[0026] The drawings show that: 101, molten iron bath gasification furnace; 102, furnace gas cooling and dust removal unit; 103, synthetic gas tank; 105, air separation unit; 106, organic solid waste bin; 107, pulverizer; 108, solid waste injection tank; 111, waste heat steam; 201, aluminum-magnesium gas melting furnace; 202, centrifugal separator; 203, vacuum distillation furnace; 220, pyrolysis oil; 221, liquid booster pump; 222, pyrolysis gas tank; 223, heat exchange gasifier; 224, ejector; 241, centrifugal cylinder liquid injection station; 242, centrifugal cylinder cleaning station; 249, aluminum-magnesium remelting furnace; 250, magnesium vapor condenser; 251, magnesium alloy remelting furnace; 252, vacuum pump; 253, aluminum liquid downflow pipe; 255, aluminum liquid holding furnace; 256, aluminum liquid casting machine; 312, centrifugal cylinder outer cylinder wall; 313, centrifugal cylinder inner cylinder wall; 317, centrifugal cylinder inner cavity; 318, centrifugal cylinder annular liquid receiving groove; 330, solid-liquid mixture; 340, aluminum-magnesium alloy filtrate; 350, centrifugal filter residue. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0028] Those skilled in the art should understand that in the disclosure of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0029] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0030] As Figs. 1-3 The present application provides a hybrid organic solid waste iron-containing waste aluminum upgrading coupled molten iron bath gas system, which is applied to waste aluminum remelting and regeneration, and includes an aluminum-magnesium gas melting furnace 201, a centrifugal separator 202 and a molten iron bath gasifier 101 connected in sequence;

[0031] The aluminum-magnesium gas melting furnace 201 contains molten aluminum-magnesium liquid, the outer wall of the aluminum-magnesium liquid pool of the aluminum-magnesium gas melting furnace 201 is indirectly heated by the synthesis gas generated by the molten iron bath gasifier 101 in combination with external gas, solid waste aluminum and solid magnesium alloy are input into the aluminum-magnesium liquid pool, the volatiles generated by the thermal pyrolysis of the waste plastics contained in the waste aluminum under heating escape from the aluminum-magnesium gas melting furnace 201 and are collected, the solid waste aluminum and the solid magnesium alloy gradually melt in the aluminum-magnesium liquid pool and form the new amount of the aluminum-magnesium liquid pool, and the aluminum-magnesium liquid pool of the aluminum-magnesium gas melting furnace 201 is a solid-liquid mixture composed of aluminum-magnesium alloy liquid and insoluble substances;

[0032] The centrifugal separator 202 is used for solid-liquid separation of the solid-liquid mixture to obtain aluminum-magnesium alloy filtrate and centrifugal residue, wherein the aluminum-magnesium alloy filtrate is input into a vacuum distillation furnace 203;

[0033] The centrifugal residue and pure oxygen are input into the molten iron bath gasifier 101;

[0034] The centrifugal residue input into the molten iron bath gasifier 101 is melted and high-temperature gasified to obtain liquid iron, molten slag and synthesis gas, so that the synthesis gas is input into the aluminum-magnesium gas melting furnace 201 as fuel gas.

[0035] In an embodiment of the present application, the waste aluminum contains more than 1.5% of iron elements by mass fraction.

[0036] Specifically, the solid waste aluminum mixed with waste plastics and solid magnesium alloy are added into the aluminum-magnesium liquid pool in the aluminum-magnesium gas melting furnace 201, the aluminum-magnesium liquid pool is indirectly heated by injecting synthetic gas into the aluminum-magnesium liquid pool and cooperating with external gas, and the synthetic gas in the present scheme is a gas composed of CO and H2, so the synthetic gas itself is a reducing gas, so that the aluminum-magnesium liquid pool maintains a reducing atmosphere, and the waste plastics contained in the waste aluminum can be pyrolyzed in an oxygen-free manner. The volatiles generated by the oxygen-free pyrolysis escape from the aluminum-magnesium gas melting furnace 201 and are collected for condensation, and the pyrolysis oil 220 and the pyrolysis gas are obtained by condensation, and the residual carbon obtained by pyrolysis is left on the surface of the aluminum-magnesium alloy liquid.

[0037] Subsequently, the solid-liquid mixture composed of the aluminum-magnesium alloy liquid and the insoluble substances in the aluminum-magnesium liquid pool is transported to the centrifugal separator 202, and the solid-liquid mixture is separated by centrifugal solid-liquid separation to form an aluminum-magnesium alloy filtrate and a centrifugal residue.

[0038] In an embodiment of the present scheme, the centrifugal residue obtained after centrifugal solid-liquid separation includes FeAl3 mixed with Mg, Si, Ti and other metals, C, and inorganic substances such as Al2O3-CaO, and this part of the centrifugal residue is sent to the crusher 107 for crushing, and then is added into the molten iron bath gasification furnace 101 together with pure oxygen. At this time, a series of chemical reactions occur in the molten iron bath gasification furnace 101, as follows:

[0039] FeAl3 = [Fe] + 3[Al];

[0040] 8Al + 3O2 + 6H2O = 4Al2O3 + 6H2;

[0041] The above formula shows that the generated iron is dissolved in the liquid catalyst contained in the molten iron bath gasification furnace 101 to supplement the iron element, and when the iron element accumulates too much, it can be released as a raw material for the steel industry. At the same time, since the chemical heat release when AL combines with oxygen is huge, it is easy to cause the molten iron bath gasification furnace 101 to overheat and overheat, so in the present scheme, oil-contaminated water, water vapor, wet materials and the like are added to reduce the temperature, and H2 is by-produced.

[0042] Similarly, Si and Ti also react as follows:

[0043] 2Si + O2 + 2H2O = 2SiO2 + 2H2;

[0044] 2Ti + O2 + 2H2O = 2TiO2 + 2H2;

[0045] Mg has a low boiling point and is quickly volatilized into the furnace gas when added into the molten iron bath gasification furnace 101, and the following reactions occur in the furnace gas to generate hydrogen and CO:

[0046] Mg + H2O = MgO + H2;

[0047] Mg + CO2= MgO + CO;

[0048] Mg + CO = MgO + C;

[0049] The reaction of carbon element is:

[0050] 2C + O2= 2CO;

[0051] In addition, in addition to the above reactions, Al2O3-CaO and other inert inorganic substances are melted in the slag by heat, becoming molten state high-quality building material raw materials.

[0052] Thus, the products in the centrifugal residue are all recovered, most of which are converted into synthesis gas of flammable gas such as H2 and CO, and then returned to the aluminum-magnesium gas melting furnace 201 as fuel gas.

[0053] It is worth mentioning that a solid waste injection tank 108 is connected between the pulverizer 107 and the molten iron bath gasification furnace 101, and the solid waste injection tank 108 is connected with the molten iron bath gasification furnace 101 and the air separation unit 105 at the same time. The centrifugal residue after crushing treatment enters the solid waste injection tank 108 for temporary storage. Then the air separation unit 105 separates air into oxygen and nitrogen. The nitrogen is used as a carrier gas to spray the centrifugal residue in the solid waste injection tank 108 into the molten iron bath gasification furnace 101, and the oxygen is directly sprayed into the molten iron bath gasification furnace 101 to participate in the reaction.

[0054] Preferably, the vacuum distillation furnace 203 is used to distill the aluminum-magnesium alloy filtrate to obtain magnesium vapor and aluminum liquid. The magnesium element volatilized from the vacuum distillation furnace 203 enters the magnesium vapor condenser 250 to be condensed into crystalline magnesium. The crystalline magnesium enters the magnesium alloy remelting furnace 251 to be heated to form magnesium liquid and is input into the magnesium alloy ingot casting machine 253. The magnesium liquid is cast into shape by the magnesium alloy ingot casting machine 253. The aluminum liquid is input into the aluminum liquid ingot casting machine 256 from the vacuum distillation furnace 203, and the aluminum liquid is cast into shape by the aluminum liquid ingot casting machine 256.

[0055] In an embodiment of the present scheme, the aluminum-magnesium liquid melted in the aluminum-magnesium gas melting furnace 201, and the aluminum-magnesium alloy filtrate contain more than 30% of the mass fraction of aluminum and more than 25% of the mass fraction of magnesium.

[0056] Preferably, the magnesium alloy condenser 250 is connected with a vacuum pump 252 on one side, so that the vacuum pump 252 can suck the inside of the magnesium alloy condenser 250, thereby maintaining the vacuum state inside the magnesium alloy condenser 250 and increasing the stability of the crystalline magnesium when it is heated again to form magnesium liquid.

[0057] Preferably, the vacuum distillation furnace 203 is connected with the aluminum liquid casting machine 256 in sequence with the aluminum liquid downstream pipe 254 and the aluminum liquid holding furnace 255, so that the aluminum liquid flows into the aluminum liquid casting machine 256 and the aluminum liquid itself can be kept stable to avoid solidification of the aluminum liquid.

[0058] Preferably, the oxygen-free pyrolysis products of the waste plastics contained in the waste aluminum are condensed to form pyrolysis oil 220 and pyrolysis gas, and the pyrolysis oil 220 and the pyrolysis gas are input into the molten iron bath gasification furnace 101 for cracking gasification by the ejector 224.

[0059] Preferably, the pyrolysis oil 220 is input into the heat exchange gasifier 223 for gasification by the liquid booster pump 221, and then enters the ejector 224 as the main injection gas, and the ejector 224 is used to extract the pyrolysis gas for pressurization, and the pyrolysis gas is stored in the pyrolysis gas tank 222.

[0060] Specifically, the pyrolysis oil 220 and the pyrolysis gas are formed by oxygen-free pyrolysis of the waste plastics contained in the waste aluminum, and after volatilization and condensation, the pyrolysis oil 220 in liquid state and the pyrolysis gas in gaseous state are formed, and then the liquid booster pump 221 pushes the pyrolysis oil 220 into the heat exchange gasifier 223 for gasification, and then the pyrolysis oil 220 and the pyrolysis gas are injected into the molten iron bath gasification furnace 101 by the ejector 224 for complete cracking gasification of the organic matter.

[0061] Preferably, the synthesis gas output from the molten iron bath gasification furnace 101 is sequentially purified and discharged by the furnace gas cooling and dust removal unit 102, and the waste heat steam 111 is stored in the synthesis gas tank 103 and then input into the aluminum-magnesium gas melting furnace 201 as fuel gas.

[0062] Preferably, the waste heat steam 111 discharged from the furnace gas cooling and dust removal unit 102 is input into the heat exchange gasifier 223 to provide a heating source for re-volatilization of the pyrolysis oil.

[0063] The present application is not limited to the above-mentioned best mode, and anyone can derive other various forms of products under the inspiration of the present application, but regardless of any changes in shape or structure, any technical solution with the same or similar technical solutions as the present application falls within the protection scope of the present application.

Claims

1. A mixed organic solid waste containing iron and aluminum upgrading coupled with a molten iron bath gas system, applied to the remelting and recycling of waste aluminum, characterized in that: It includes an aluminum-magnesium gas melting furnace (201), a centrifugal separator (202), and a molten iron bath gasification furnace (101) that are connected in a sequential cycle; The aluminum-magnesium gas-fired melting furnace (201) contains molten aluminum and magnesium. The outer wall of the aluminum-magnesium molten pool of the aluminum-magnesium gas-fired melting furnace (201) is indirectly heated by the synthesis gas generated by the molten iron bath gasification furnace (101) in combination with external gas. Solid waste aluminum and solid magnesium alloy are input into the aluminum-magnesium molten pool. The volatiles generated by the anaerobic pyrolysis of waste plastic contained in the waste aluminum escape from the aluminum-magnesium gas-fired melting furnace (201) and are collected. The solid waste aluminum and solid magnesium alloy gradually melt in the aluminum-magnesium molten pool and form a new increment in the aluminum-magnesium molten pool. The aluminum-magnesium molten pool of the aluminum-magnesium gas-fired melting furnace (201) is a solid-liquid mixture composed of aluminum-magnesium alloy liquid and insoluble matter. The centrifuge (202) is used to separate the solid and liquid mixture to obtain aluminum-magnesium alloy filtrate and centrifugal residue, wherein the aluminum-magnesium alloy filtrate is fed into the vacuum distillation furnace (203); Centrifugal residue and pure oxygen are fed into the molten iron bath gasifier (101); The centrifugal residue fed into the molten iron bath gasifier (101) is melted and gasified at high temperature to obtain liquid iron, molten slag and syngas, so that the syngas is fed into the aluminum-magnesium gas melting furnace (201) for use as fuel gas; The anaerobic pyrolysis products of waste plastic contained in waste aluminum are condensed to form pyrolysis oil (220) and pyrolysis gas, and the pyrolysis oil (220) and pyrolysis gas are fed into the molten iron bath gasifier (101) by the ejector (224) for cracking and gasification. The pyrolysis oil (220) is fed into the heat exchanger vaporizer (223) via the liquid booster pump (221) for vaporization, and then enters the ejector (224) as the main ejector gas. The ejector (224) is used to draw out the pyrolysis gas for pressurization. The pyrolysis gas is stored in the pyrolysis gas tank (222). The syngas output from the molten iron bath gasification furnace (101) is purified by the furnace gas cooling and dust removal unit (102) and discharged as waste heat steam (111), then stored in the syngas holder (103) and input into the aluminum-magnesium gas melting furnace (201) for use as fuel gas. The waste heat steam (111) discharged from the furnace gas cooling and dust removal unit (102) is fed into the heat exchanger vaporizer (223) to provide a heating source for the re-evaporation of pyrolysis oil.

2. The mixed organic solid waste containing iron and aluminum upgrading coupled with molten iron bath gas system according to claim 1, characterized in that: The vacuum distillation furnace (203) is used to distill aluminum-magnesium alloy filtrate to obtain magnesium vapor and aluminum liquid. After the magnesium element is volatilized by the vacuum distillation furnace (203), it enters the magnesium vapor condenser (250) to become crystalline magnesium. The crystalline magnesium enters the magnesium alloy remelting furnace (251) to form magnesium liquid and is fed into the magnesium alloy ingot casting machine (253). The aluminum liquid is fed into the aluminum liquid ingot casting machine (256) by the vacuum distillation furnace (203).

3. The mixed organic solid waste iron-containing aluminum waste upgrading coupled with molten iron bath gas system according to any one of claims 1 or 2, characterized in that: The aluminum-magnesium melt and aluminum-magnesium alloy filtrate melted in the aluminum-magnesium gas-fired melting furnace (201) contain more than 30% aluminum by mass and more than 25% magnesium by mass.

4. The mixed organic solid waste containing iron and aluminum upgrading coupled with molten iron bath gas system according to claim 2, characterized in that: A vacuum pump (252) is connected to one side of the magnesium alloy condenser (250).

5. The mixed organic solid waste containing iron and aluminum upgrading coupled with molten iron bath gas system according to claim 2, characterized in that: A liquid aluminum flow pipe (254) and a liquid aluminum holding furnace (255) are connected in sequence between the vacuum distillation furnace (203) and the liquid aluminum casting machine (256) so that the liquid aluminum flows into the liquid aluminum casting machine (256).

6. The mixed organic solid waste containing iron and aluminum upgrading coupled with molten iron bath gas system according to claim 1, characterized in that: Waste aluminum contains more than 1.5% iron by mass.

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