Coal gangue and high-humidity organic solid waste coupling self-sustaining heat decarbonization synergistic activation method

Abstract

The invention discloses a coal gangue and high-humidity organic solid waste coupling self-sustaining heat decarburization synergistic activation method, and belongs to the technical field of solid waste comprehensive utilization, and the method comprises the following steps: preparing a mixed material from coal gangue particles and high-humidity organic solid waste; distributing the mixed material in a self-sustaining heat decarburization reactor; the bottom of the material is preheated to trigger self-sustaining flameless combustion of the mixed material, a dynamic pyrolysis-oxidation front surface is formed, the dynamic pyrolysis-oxidation front surface is spread from bottom to top, and decarburization and activation of the mixed material are completed; and carrying out quenching treatment to obtain high-activity mixed ash. According to the method, a material pore structure and a heat value synergistic effect are utilized, and a fixed bed heat storage and oxidation-pyrolysis-drying integrated principle is combined, so that solid waste heat value complementation and activation synergy are realized, a self-sustaining heat reaction of a mixed material can be triggered only by a small amount of external heat, a relatively high reaction temperature can be maintained without additional fuel, and the energy consumption is reduced. Efficient decarbonization of the mixed material is achieved, the activity of the material is improved, efficient utilization of solid waste is achieved, and the solid waste utilization cost is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of comprehensive utilization of solid waste, and particularly relates to a coal gangue and high-moisture organic solid waste coupling self-sustaining heat decarburization and activation method. BACKGROUND

[0002] Coal gangue, as a coal associated mineral, presents black and gray rock characteristics, has a lower carbon content than coal and a higher hardness, and has a heat value generally lower than 6.3 MJ / kg. The inorganic ash content of the coal gangue, including Al2O3, SiO2 and Fe2O3, accounts for 60% to 95%. Due to the great difficulty in utilization, the coal gangue becomes a typical industrial solid waste. According to the proportion of raw coal production, about 0.15 to 0.2 tons of coal gangue are generated per ton of coal, resulting in an annual coal gangue associated amount of hundreds of millions of tons in China.

[0003] Although the coal gangue treatment technology in China is internationally leading, the comprehensive utilization rate is only 60%, the historical stock amount has reached 5 to 6 billion tons, the land occupation is more than 15,000 hectares, and 1.5 to 2 billion tons of new accumulation is added every year, causing serious environmental problems. As the largest industrial solid waste in stock and increment in China, the coal gangue has become a complex pollution source that needs to be treated urgently.

[0004] At the same time, with the acceleration of industrial production and urbanization, the amount of high-moisture solid waste (such as municipal sludge with a water content of 60% to 85% and coal chemical gasification slag) continues to rise. Due to the characteristics of high moisture, low heat value and easy odor, the traditional landfill disposal faces the risk of leachate pollution, and direct incineration needs additional fuel to assist in dewatering, which is limited in both economy and environmental protection. Especially under the background of the "double carbon" goal, the existing single disposal mode of dewatering and drying cannot meet the requirements of pollution reduction, carbon reduction and synergistic effect. At the same time, the organic matter and inorganic minerals contained in high-moisture solid waste have resource potential, but the water binding leads to low thermal chemical conversion efficiency, which restricts their energy and material utilization.

[0005] At present, the conversion of coal gangue and organic solid waste into building materials (such as cement admixture) is an effective way to realize the large-scale consumption of the two, but the activity needs to be improved and the residual carbon content needs to be reduced through activation treatment. Although the existing technology designs some treatment processes for the recycling of the two objects, it cannot reliably and low-costly complete the recycling of the two materials, and has great application limitations. SUMMARY

[0006] In view of one or more of the above defects or improvement needs of the prior art, the present application provides a coal gangue and high-moisture organic solid waste coupled self-sustaining heat decarburization and activation method, which can realize the mutual synergistic treatment of coal gangue and high-moisture organic solid waste, improve the decarburization efficiency of coal gangue and high-moisture organic solid waste and the material activity of the mixed material, and meet the demand for synergistic utilization of coal gangue and high-moisture organic solid waste.

[0007] To achieve the above-mentioned purpose, the present application provides a coal gangue and high-moisture organic solid waste coupled self-sustaining heat decarburization and activation method, which comprises the following steps: (1) mixing crushed coal gangue and high-moisture organic solid waste to prepare a porous matrix mixed material; (2) distributing the mixed material in a self-sustaining heat decarburization reactor; wherein a layer of coal gangue particles is first covered on the heating device at the bottom of the self-sustaining heat decarburization reactor, and then the porous matrix mixed material is filled on the layer of coal gangue particles; (3) first turning on the heating device to heat the layer of coal gangue particles at the bottom of the reactor until the organic matter ignition point is reached, triggering the self-sustaining flameless combustion of the mixed material layer, and forming a high-temperature dynamic pyrolysis-oxidation front; turning off the heating device and turning on the air supply device to supply air from bottom to top, so that the high-temperature dynamic pyrolysis-oxidation front propagates from bottom to top until the self-sustaining heat reaction of all the mixed material is completed; (4) discharging the ash formed after the reaction and performing quenching treatment and utilization.

[0008] As a further improvement of the present application, in process (1), the particle size of the crushed coal gangue is in the range of 2mm to 5mm; and / or The coal gangue is low-carbon coal gangue with a fixed carbon content of less than 10%; and / or The high-moisture organic solid waste is a solid waste material with a water content of not less than 50%.

[0009] As a further improvement of the present application, the high-moisture organic solid waste is at least one of sludge and high-moisture, high-hydraulic super-low heat value gasification slag.

[0010] As a further improvement of the present application, the mass ratio between the coal gangue and the high-moisture organic solid waste is in the range of 1:0.2 to 1:8.

[0011] As a further improvement of the present application, in process (2), a certain thickness of coal gangue particle layer is filled on top of the porous matrix mixed material during distribution.

[0012] As a further improvement of the present application, the thickness of the coal gangue particle layer on top of the porous matrix mixed material is 10mm to 20mm; and / or The thickness of the gangue particles covering the heating device at the bottom of the porous matrix mixture is 10-50 mm.

[0013] As a further improvement of the present application, in process (3), the temperature of the high-temperature dynamic pyrolysis-oxidation front is maintained at 600-1000°C by controlling the air supply amount of the air supply device.

[0014] As a further improvement of the present application, in process (4), the reacted ash product is subjected to quenching treatment to obtain high-activity mixed ash.

[0015] As a further improvement of the present application, when the high-activity mixed ash is applied, the high-activity mixed ash is first sieved, the micropowder with a particle size not greater than 0.08 mm is used as an active mixed material, and the ash particles with a particle size greater than 0.08 mm are subjected to 3%-8% alkali solution excitation to obtain concrete aggregate with high compressive strength. Alternatively When the high-activity mixed ash is applied, the mixed ash is directly crushed and finely ground to obtain active mixed materials with corresponding particle sizes and specific surface areas.

[0016] As a further improvement of the present application, the quenching treatment process adopts atomized water quenching or inert gas quenching.

[0017] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0018] Overall, compared with the prior art, the above technical solutions conceived by the present application have the following beneficial effects: The coal gangue and high-wet organic solid waste coupling self-sustaining heat decarburization and activation method comprises the following processes: after being crushed, coal gangue particles and high-wet organic solid waste are prepared into a mixture; the mixture is distributed in a self-sustaining heat decarburization reactor; the bottom of the material is preheated to trigger self-sustaining flameless combustion of the mixture, forming a dynamic pyrolysis-oxidation front, and the dynamic pyrolysis-oxidation front propagates from bottom to top and completes the decarburization and activation of the mixture; and finally, high-activity mixed ash is obtained through quenching treatment. The above method utilizes the synergistic effect of the pore structure and calorific value of the material, combines the principles of fixed bed heat accumulation and oxidation-pyrolysis-drying integration, and realizes the complementation of solid waste calorific value and activation synergy through the control of air supply amount and mixture ratio, so that a small amount of external heat can trigger the self-sustaining heat reaction of the mixture, a higher reaction temperature can be maintained without additional fuel, efficient decarburization of the mixture can be realized, the activity of the treated material can be improved, efficient utilization of solid waste can be effectively realized, and the cost consumption during the utilization of solid waste can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings described below only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0020] Figure 1 is a flowchart of the coal gangue and high-moisture organic solid waste coupled self-sustaining heat decarburization and activation method in the embodiments of the present application. Figure 2 is a schematic diagram of each stage of the self-sustaining heat decarburization and activation reaction of the mixture in the reactor in the embodiments of the present application. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the present application clearer, the following will further describe the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as there is no conflict.

[0022] In the description of the present application, it should be understood that, unless otherwise explicitly specified and limited, the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0023] In addition, unless otherwise explicitly limited, the terms "first", "second" are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0024] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0026] In the following, with reference to Figures 1-2 The coal gangue and high-moisture organic solid waste coupled self-sustaining heat decarburization and activation method according to the preferred embodiment of the present application is described.

[0027] For the treatment method in the preferred embodiment, the process flow is as shown in Figure 1 The preferred embodiment includes the following steps: (1) Preparing coal gangue and high-moisture organic solid waste, and preparing porous matrix mixed material; Specifically, the low-calorific-value coal gangue is crushed to a set particle size, and mixed with the high-moisture organic solid waste to form a mixed material with a certain porosity.

[0028] In the preferred embodiment, the coal gangue as one of the raw materials is crushed by a crusher, and the particle size of the crushed coal gangue is preferably in the range of 2mm~5mm. The reason for designing the above particle size range is that if the particle size of the material is too small, the permeability of the mixed material of coal gangue and high-moisture organic solid waste is low, which increases the resistance of combustion air to the surface of the material, which is not conducive to the heat decarburization reaction. If the particle size of the material is too large, it is easy to cause the coal gangue to be difficult to burn completely, which affects the decarburization reaction speed and decarburization degree of the coal gangue, and cannot fully complete the mineralization, resulting in high residual carbon content and low activity. Therefore, controlling the particle size of the coal gangue within a reasonable range plays an extremely important role in improving the treatment efficiency and comprehensive performance of the coal gangue.

[0029] In more detail, for the mixture in the preferred embodiment, the coal gangue is preferably low-carbon coal gangue with a fixed carbon content of less than 10%, such as coal gangue with a fixed carbon content of 1% to 8%. For the selection of coal gangue, if the fixed carbon content of the coal gangue is too low, the reaction system temperature may not be effectively increased, resulting in low ash activity; if the carbon content in the coal gangue is too high, it is easy to cause the reaction temperature to be too high, which has the risk of slagging, affecting the activation effect and system operation safety.

[0030] Correspondingly, the high-moisture organic solid waste in the preferred embodiment specifically refers to solid waste materials with a water content of not less than 50%. In more detail, in actual material selection, the organic matter content of the high-moisture organic solid waste is further preferably not less than 20%.

[0031] As an optional example, the high-moisture organic solid waste in the preferred embodiment is preferably at least one of sludge and high-moisture, high-water-content, low-heat-value gasification slag.

[0032] Further, when mixing the low-heat-value coal gangue and the high-moisture organic solid waste, the mass ratio between the two is preferably in the range of 1:0.2 to 1:8.

[0033] The reason for this is that in order to achieve self-sustaining reaction of the mixture of low-heat-value coal gangue and high-moisture organic solid waste, the mixture must have good air permeability to ensure the heat and mass transfer effect in the material. If the proportion of coal gangue particles in the mixture is too small, the air permeability of the mixture may not be effectively maintained; if the proportion of coal gangue particles in the mixture is too large, it is easy to cause the system to have too high air permeability, and the heat is quickly taken away by the flue gas, resulting in large heat loss of the system, which cannot maintain a high reaction temperature of the system, affecting the self-sustaining effect of the thermal decarburization reaction. Therefore, in the preferred embodiment, by controlling the mass ratio of the two to be in the above-mentioned range, the air permeability of the mixture can be effectively guaranteed, and the heat demand required for the subsequent self-sustaining reaction of the mixture can be met.

[0034] (2) distributing the mixture in the self-sustaining thermal decarburization reactor; Specifically, the self-sustaining thermal decarburization reactor in the preferred embodiment has a heating device at the bottom and an air supply device, the former is used to provide additional heat to the bottom material at the initial stage of the reaction to trigger the self-sustaining flameless combustion of the mixture, and the latter is used to provide sufficient air (oxygen) to the mixture for the self-sustaining flameless combustion of the mixture.

[0035] In actual operation of the self-sustaining reactor, preferably, a layer of coal gangue particles with a thickness of 10-50 mm is first covered on the heating device (e.g. an electric heating rod) at the bottom of the reactor, and the coal gangue particles are used as the heat storage medium bed material for the accumulation of heat required for starting the self-sustaining flameless combustion. Secondly, the porous matrix mixture material is filled in the top layer of the coal gangue particle layer until the internal cavity of the reactor is nearly filled. Then, a layer of coal gangue particles, for example, with a thickness of 10-20 mm, is laid on the top of the porous matrix mixture material.

[0036] The reason for arranging the coal gangue particle material layer on both sides of the porous matrix mixture material is based on the requirement of the self-sustaining heat decarburization reaction. The coal gangue particles laid on the bottom of the porous matrix mixture material are used as the heat storage medium bed material and also improve the gas uniformity to ensure the uniformity of the subsequent air supply in each region of the furnace. The coal gangue particles laid on the top of the porous matrix mixture material are used for system heat preservation to avoid rapid heat loss from the top.

[0037] (3) Ignition of the self-sustaining heat decarburization reactor to perform the self-sustaining heat reaction of the mixture material; In the preferred embodiment, the self-sustaining heat decarburization reactor for the mixture material is preferably a fixed bed reactor, which is provided with a multi-stage temperature sensor and oxygen concentration feedback control system, an air supply device, a slag discharge system and a quenching system, and can reliably realize real-time monitoring, feedback and control of the reaction temperature and oxygen concentration in each region of the reactor, and can realize control of the oxygen concentration in the reactor through air supply of the air supply device, as well as rapid cooling and discharge of the ash after the reaction.

[0038] Meanwhile, the inner wall of the combustion section of the self-sustaining decarburization reactor is preferably coated with a refractory coating, and the refractory coating preferably has a temperature resistance of not less than 1000°C.

[0039] For the self-sustaining heat reaction in the preferred embodiment, the technical elements that need to be met include organic matter components for combustion reaction, porous heat storage and heat transfer medium fillers, and uniform air supply. The organic matter components in the coal gangue and organic solid waste provide the process heat source; the coal gangue particles form the porous characteristics as the mixed medium skeleton; and the uniform air supply is used to ensure the supply of oxidizing agent to the reaction process and to promote the propagation of heat generated by the reaction.

[0040] Meanwhile, the principle of the self-sustaining propagation process of the heat decarburization is that the heat released by the oxidation of the lower layer of material propagates upward to provide the heat required for the drying and ignition processes of the upper layer of material, thereby realizing the self-sustaining propagation of the oxidation reaction.

[0041] In actual setting, the main process of heat decarburization is usually divided into three steps: filling, ignition and propagation, as shown in FIG. Figure 2 .

[0042] First, fill a certain thickness of coal gangue particles at the bottom of the reactor, and fill the mixed material above it, taking the bottom coal gangue particle layer as the initial heat propagation medium and propagating heat to the bottom of the mixed material.

[0043] Secondly, the bottom layer of coal gangue particles is heated by the heating device at the bottom of the reactor, prompting the bottom material to reach the organic matter ignition point, usually 200-400℃, for short-time ignition, triggering self-sustaining flameless combustion of the mixed material layer, forming a high-temperature dynamic pyrolysis-oxidation front.

[0044] After that, open the air supply device to supply air from bottom to top, start the thermal decarburization process while stopping external heating (turn off the heating of the heating device), and make the high-temperature dynamic pyrolysis-oxidation front propagate from bottom to top until the self-sustaining thermal reaction of all the mixed material is completed.

[0045] In actual control, by controlling the air supply amount, air supply speed of the air supply device, and the mixing ratio of coal gangue particles and high-moisture organic solid waste, the temperature of the high-temperature dynamic pyrolysis-oxidation front is maintained at 600-1000℃. Through the temperature sensors arranged in each area of the furnace, the position and propagation direction of the high-temperature dynamic pyrolysis-oxidation front can be accurately grasped; during actual monitoring, when the front temperature is lower, the reaction temperature can be increased by increasing the air supply speed.

[0046] For the treatment method in the preferred embodiment, based on the synergistic combustion effect between fixed carbon in coal gangue and organic matter in high-moisture organic solid waste and the pore effect generated by the mixing of the two materials in the mixed material, self-sustaining flameless combustion is triggered by preheating at the bottom of the self-sustaining decarburization reactor, forming a high-temperature dynamic pyrolysis-oxidation front and propagating from bottom to top, realizing deep carbon removal and silicon-aluminum activation.

[0047] (4) Discharge the ash formed after the reaction and perform quenching treatment and utilization.

[0048] By quenching treatment of the ash product after the reaction, high-activity mixed ash is obtained.

[0049] As a utilization method of the mixed ash, mechanical screening can be performed to obtain large-particle decarburized coal gangue and fine powder. The fine powder can be directly used as active mixed material, such as using fine powder with a particle size not greater than 0.08mm as cement admixture; the large-particle decarburized coal gangue can be used to prepare concrete aggregate after alkali activation treatment, such as using ash particles with a particle size of 0.08mm-5mm after activation by 3%-8% alkali solution to prepare concrete aggregate with high compressive strength.

[0050] As another utilization mode of the mixed ash, the mixed ash can also be directly crushed and finely ground to obtain the active mixed material with the corresponding particle size and specific surface area.

[0051] More specifically, the quenching process in the preferred embodiment preferably adopts water atomization quenching or inert gas quenching.

[0052] The foregoing technical solutions are further described and explained through two specific embodiments as follows. In the two embodiments, the selected coal gangue and high-moisture organic solid waste are as follows: The coal gangue is the coal gangue in a certain region, and the main chemical components are as follows: SiO259.98%, Al2O325.57%, Fe2O34.80%, MgO 1.74%, CaO 1.35%, Na2O 0.45%, K2O 3.46%, and fixed carbon 3.62%.

[0053] The high-moisture organic solid waste is the high-moisture sludge in a certain water treatment plant, and the main chemical components are as follows: The water content is 68.40%, the fixed carbon is 1.64%, the volatile matter is 16.21%, the ash content is 13.75%, and the heat value is about 0.326 MJ / kg.

[0054] Embodiment 1: The coal gangue is crushed into particles with a size of 3-5 mm, and is mixed with the high-moisture sludge at a mass ratio of 1:4, and is fully mixed in a mechanical mixing device to form a porous matrix mixture.

[0055] A self-sustaining decarburization reactor of a laboratory scale is selected for testing, and a wind supply device and an electric heating device (electric heating rod) are arranged at the bottom. The coal gangue particles are laid on the bottom of the reactor and cover the electric heating rod, and then the porous matrix mixture is fed into the reactor until the reactor is nearly filled, and then the coal gangue particles with a thickness of 10-20 mm are laid on the top of the mixture to complete the material laying process.

[0056] The electric heating device is turned on to preheat the bottom material for about 1 hour, the electric heating is turned off, the wind supply device is turned on, and air is supplied into the reactor at a flow rate of 40 L / min to complete the ignition. Until the material goes through the high-temperature process (the maximum temperature is 650-700℃) from bottom to top, and the reaction is completed, the decarburized activated coal gangue sintered material and the decarburized solid waste fine ash are obtained.

[0057] Thereafter, the mixture of the decarburized activated coal gangue sintered material and the decarburized solid waste fine ash is fed into a jaw crusher for crushing, and the particle size of the crushed material is about 1 mm. Thereafter, the crushed material is dry ground in a ball mill to a particle size specific surface area of about 350 m 2 / kg to obtain the active mixed material.

[0058] Through the detection of the active mixed material, it is known that the burn loss of the mixed material is 1.53%, and the residual carbon content is 0.71%. At the same time, based on the standards GB / T17671-1999 and GB / T12957-2005, the activity of the active mixed material is tested, and the results show that the activity index of the mixed material obtained is 72%.

[0059] Example 2: The coal gangue is crushed into particles of 3-5 mm, and mixed with high-moisture sludge at a mass ratio of 1:2, and fully mixed in a mechanical mixing device to form a porous matrix mixed material.

[0060] A laboratory-scale self-sustaining decarburization reactor is selected for testing, which is provided with a wind supply device and an electric heating device (electric heating rod) at the bottom. The coal gangue particles are laid on the bottom of the reactor and cover the electric heating rod, and then the porous matrix mixed material is fed into the reactor until it is close to filling the reactor, and then the coal gangue particles with a thickness of 10-20 mm are laid on the top of the mixed material, and the material laying process is completed.

[0061] The electric heating device is turned on to preheat the bottom material for about 1 hour, the electric heating is turned off, and the air supply device is turned on to supply air into the reactor at a flow rate of 40 L / min, and the ignition is completed. Until the material passes through the high-temperature process from bottom to top (compared with Example 1, the coal gangue particle content in this embodiment is increased, and the heat generated by it is increased, and the maximum temperature of the front surface reaches 750-790°C), and after the reaction is completed, the decarburized activated coal gangue sintered material and decarburized solid waste fine ash are obtained.

[0062] Thereafter, the decarburized activated coal gangue sintered material and decarburized solid waste fine ash mixture is fed into a jaw crusher for crushing, and the particle size after crushing is about 1 mm, and thereafter the crushed material is dry ground in a ball mill to a particle size specific surface area of about 350 m 2 / kg, to obtain an active mixed material.

[0063] Through the detection of the active mixed material, it is known that the burn loss of the mixed material is 1.21%, and the residual carbon content is 0.33%. At the same time, based on the standards GB / T17671-1999 and GB / T12957-2005, the activity of the active mixed material is tested, and the results show that the activity index of the mixed material obtained is 83%.

[0064] Through the test verification in the two embodiments, it can be shown that the coal gangue and high-moisture organic solid waste coupling self-sustaining heat decarburization and activation method in the preferred embodiment can realize the decarburization of the mixed materials based on the heat self-sustaining reaction, greatly improve the activity of the mixed materials, realize the complementation of the heat values of the solid wastes and the activation of the minerals, save the energy and reduce the energy consumption, and improve the utilization efficiency of the coal gangue and the high-moisture organic solid waste and the added value of the products of the solid waste treatment.

[0065] Those skilled in the art will easily understand that the above description is only the preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for synergistic activation of gangue and high-humidity organic solid waste coupled with self-sustaining thermal decarbonization, characterized in that: The steps include: (1) Mixing crushed coal gangue with high-humidity organic solid waste to prepare a porous matrix mixed material; (2) distributing the mixed material in the self-sustaining thermal decarburization reactor; wherein, firstly, a layer of coal gangue particles is covered on the heating device at the bottom of the self-sustaining thermal decarburization reactor, and then the porous matrix mixed material is filled on the coal gangue particle layer; (3) First, turn on the heating device to heat the coal gangue particle layer at the bottom of the reactor until the ignition point of the organic matter is reached, triggering the self-sustaining flameless combustion of the mixed material layer and forming a high-temperature dynamic pyrolysis-oxidation front; turn off the heating device, turn on the air supply device to supply air from bottom to top, so that the high-temperature dynamic pyrolysis-oxidation front propagates from bottom to top until the self-sustaining thermal reaction of all the mixed materials is completed; (4) Discharge the ash formed after the reaction, and quench it and utilize it.

2. The method for synergistic activation of gangue and high-humidity organic solid waste coupled with self-sustaining thermal decarbonization according to claim 1, characterized in that: In process (1), the particle size of the coal gangue after crushing is in the range of 2 mm to 5 mm; and / or The coal gangue is low-carbon coal gangue with a fixed carbon content of less than 10%; and / or The high-humidity organic solid waste is a solid waste material with a moisture content of not less than 50%.

3. The method for synergistic activation of gangue and high-humidity organic solid waste coupled with self-sustaining thermal decarbonization according to claim 2, characterized in that: The high-humidity organic solid waste is at least one of sludge and high-water-content ultra-low calorific value gasified slag.

4. The method for synergistic activation of gangue and high-humidity organic solid waste coupled with self-sustaining thermal decarbonization according to any one of claims 1 to 3, characterized in that: The mass ratio between the coal gangue and the high-humidity organic solid waste is in the range of 1:0.2 to 1:

8.

5. The method for synergistic activation of gangue and high-humidity organic solid waste coupled with self-sustaining thermal decarbonization according to any one of claims 1 to 3, characterized in that: In process (2), a layer of coal gangue particles of a certain thickness is filled on top of the porous matrix mixture material of the cloth.

6. The method for synergistic activation of gangue and high-humidity organic solid waste coupled with self-sustaining thermal decarbonization according to claim 5, characterized in that: The thickness of the coal gangue particle layer on the top of the porous matrix mixture is 10 mm to 20 mm; and / or The thickness of the coal gangue particles covering the heating device at the bottom of the porous matrix mixture is 10-50 mm.

7. The method for synergistic activation of gangue and high-humidity organic solid waste coupled with self-sustaining thermal decarbonization according to any one of claims 1 to 3 and 6, characterized in that: In process (3), the temperature of the high-temperature dynamic pyrolysis-oxidation front is maintained at 600~1000℃ by controlling the air supply volume of the air supply device.

8. The method for synergistic activation of gangue and high-humidity organic solid waste coupled with self-sustaining thermal decarbonization according to any one of claims 1 to 3 and 6, characterized in that: In process (4), the ash product after the reaction is rapidly cooled to obtain a highly active mixed ash.

9. The method for synergistic activation of gangue and high-humidity organic solid waste coupled with self-sustaining thermal decarbonization according to claim 8, characterized in that: When the highly active mixed ash is used, the highly active mixed ash is first sieved, and fine powder with a particle size of no more than 0.08 mm is used as an active mixed material, and ash particles with a particle size greater than 0.08 mm are activated with a 3% to 8% alkaline solution to obtain a concrete aggregate with high compressive strength; or When the highly active mixed ash is used, the mixed ash is directly crushed and finely ground to obtain an active mixed material with corresponding particle size and specific surface area.

10. The method for synergistic activation of gangue and high-humidity organic solid waste coupled with self-sustaining thermal decarbonization according to claim 8, characterized in that: The rapid cooling process uses atomized water quenching or inert gas quenching.

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