A method for carbonizing bulk solid waste based on carbon dioxide hierarchical storage utilization

Abstract

The present application relates to a kind of based on carbon dioxide hierarchical storage utilization bulk solid waste carbonization method, it includes the following steps, S1 establishes solid waste carbonization chain;S2 solid waste powder is thrown into the tray fixed unit and carries out primary carbonization treatment, and the carbonization parameter of carbonization parameter hierarchical regulation unit is set, and carbonized powder is obtained;S3 the carbonized powder, or the carbonized powder and water are thrown into the stirring carbonization unit and carry out secondary carbonization treatment, and the carbonization parameter of carbonization parameter hierarchical regulation unit is set, and carbonized slurry is obtained;S4 the carbonized slurry is thrown into the stirring granulation unit and carries out tertiary carbonization treatment, and the carbonization parameter of carbonization parameter hierarchical regulation unit is set, and carbonized granule is obtained.The present application is by the hierarchical regulation of CO2 Concentration, air pressure, temperature, humidity and carbonization time etc. carbonization parameter, while realizing the multifunctional carbonization treatment of solid waste in accelerating solid waste and CO2 Reaction, with the advantage of improving solid waste CO2 Storage utilization rate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of resource processing of bulk solid waste, and in particular to a bulk solid waste carbonization method based on carbon dioxide grading storage utilization. BACKGROUND

[0002] The existing bulk industrial solid waste mainly includes tailings, fly ash, coal gangue, smelting slag, coal combustion slag and desulfurization gypsum. Most of the tailings and a small amount of coal gangue, fly ash, slag and smelting slag are discarded or stored in different non-environmentally friendly forms, which not only occupies land and pollutes the environment, but also seriously endangers human health and the growth and survival of animals and plants. At present, the comprehensive utilization of bulk solid waste mainly includes recovery of valuable elements, filling of mined-out areas, improvement of soil and production of building materials. From the perspective of solid waste consumption, the amount of solid waste available for secondary recovery is limited, and the secondary recovery process is difficult to implement due to high requirements and high cost. After recovery, a large amount of solid waste will be discharged again. Neither resource production nor economic benefit is the best way for solid waste utilization.

[0003] As early as the 1960s, research on the application of fly ash, silica ash and rice husk ash in building materials has been carried out and continues to this day. Through the improvement and research and development of equipment technology, the comprehensive utilization rate of solid waste in the building material industry has been improved. At the same time, countries have issued supporting laws and regulations to stimulate the enthusiasm of enterprises to utilize solid waste, thereby improving the impact of industrial solid waste on the environment to a certain extent. Bulk industrial solid waste often contains mineral components such as C3S and C2S, which are similar to the components of Portland cement, and thus has potential cementitious activity. By utilizing solid waste containing calcium and magnesium minerals and simulating the chemical weathering process of rocks in nature, CO2 can be mineralized into stable solid carbonates, thereby achieving CO2 emission reduction.

[0004] Although there are many studies and processes for carbonizing solid waste, most of them are carried out under high temperature and high pressure conditions, and require high CO2 concentration, long carbonization time and low production efficiency, which cannot be applied on a large scale. The patent with the authorization announcement number CN104478256B discloses a preparation method of magnesium-calcium carbonate cementing material, which is prepared by carbonizing industrial alkaline waste slag, active magnesium oxide and cement with CO2. The industrial alkaline waste slag is at least one of finely ground slag, carbide slag, steel slag, fly ash, magnesium slag and cement kiln dust. The CO2 concentration during carbonization is 99.9%, the pressure is 0.1-3.0 MPa, the carbonization temperature is 20-60℃, and the CO2 curing time is 3h-14d. The solid waste carbonization method based on carbon dioxide utilization has the problems of multiple raw material compositions, complex parameter control, large parameter error, and the carbonization device used can only adjust a few parameters such as carbon dioxide concentration, pressure and temperature. Therefore, the absorption and utilization rate of carbon dioxide by solid waste is low. SUMMARY

[0005] The problem to be solved by the present application is to provide a solid waste carbonization method based on carbon dioxide hierarchical storage and utilization to solve the above-mentioned problems existing in the prior art, which realizes multifunctional carbonization treatment of solid waste by hierarchical regulation of carbonization parameters such as CO2 concentration, gas pressure, temperature, humidity and carbonization time while accelerating the reaction of solid waste and CO2, and has the advantage of improving the utilization rate of CO2 storage of solid waste.

[0006] The above-mentioned application object of the present application is realized by the following technical scheme:

[0007] A bulk solid waste carbonization method based on carbon dioxide hierarchical storage and utilization, comprising the following steps,

[0008] S1, establishing a solid waste carbonization chain, the solid waste carbonization chain comprising a plurality of carbonization kettles, a carbonization parameter hierarchical regulation unit arranged on the carbonization kettles, and a tray fixing unit, a stirring carbonization unit and a stirring granulation unit arranged in the carbonization kettle body respectively, the carbonization parameters of the carbonization parameter hierarchical regulation unit comprising CO2 concentration, gas pressure, temperature, humidity and carbonization time;

[0009] S2, feeding solid waste powder into the tray fixing unit for primary carbonization treatment, and setting the carbonization parameters of the carbonization parameter hierarchical regulation unit to obtain carbonized powder;

[0010] S3, feeding the carbonized powder or the carbonized powder and water into the stirring carbonization unit for secondary carbonization treatment, and setting the carbonization parameters of the carbonization parameter hierarchical regulation unit to obtain carbonized slurry;

[0011] S4, feeding the carbonized slurry into the stirring granulation unit for tertiary carbonization treatment, and setting the carbonization parameters of the carbonization parameter hierarchical regulation unit to obtain carbonized particles.

[0012] Further, in the S1, the internal diameter of the carbonization kettle is 800-1200mm, the length is 800-1000mm, the maximum allowable pressure is 3MPa, and the material is 304 stainless steel.

[0013] Further, in the S1, the carbonization parameter hierarchical regulation unit comprises a carbon dioxide source conveying module, a carbon dioxide concentration detection module, a vacuum pumping module, a gas pressure detection module, a refrigeration and heating module, a temperature detection module, a humidification module, a humidity detection module and a control module; wherein,

[0014] The output end of the carbon dioxide source conveying module, the input end of the vacuum pumping module, the output end of the refrigeration and heating module, and the output end of the humidification module are communicated with the inside of the carbonization kettle;

[0015] The carbon dioxide concentration detection module, the air pressure detection module, the temperature detection module, and the humidity detection module are installed on the carbonization kettle in a manner that the detection ends face the tray fixing unit, the stirring carbonization unit, or the stirring granulation unit;

[0016] The signal input end of the control module is electrically connected to the carbon dioxide concentration detection module, the air pressure detection module, the temperature detection module, and the humidity detection module, and the signal output end of the control module is electrically connected to the carbon dioxide source conveying module, the vacuumizing module, the refrigeration and heating module, the humidifying module, and the stirring carbonization unit or the stirring granulation unit, so as to complete the carbonization parameter regulation in the carbonization kettle.

[0017] Specifically, in the carbonization parameter hierarchical regulation unit of the present application:

[0018] The "carbon dioxide source conveying module" refers to a device for generating or storing a gas containing a carbon dioxide source, a pipeline for conveying the gas containing the carbon dioxide source to the inside of the carbonization kettle, and an electronic switch arranged on the device and / or a control valve arranged on the pipeline. The carbon dioxide source is CO2 gas or industrial flue gas. For example, the carbon dioxide source conveying module includes a carbon dioxide storage tank, a carbon dioxide conveying pipeline connected to the carbon dioxide storage tank and the carbonization kettle, a control valve arranged on the carbon dioxide conveying pipeline, an air compressor, an air conveying pipeline connected to the air compressor and the carbonization kettle, and an electronic switch arranged on the air compressor.

[0019] The "carbon dioxide concentration detection module" refers to a sensor for detecting the CO2 component and concentration in a gas. For example, the carbon dioxide concentration detection module is a carbon dioxide concentration sensor, which detects the CO2 concentration in the range of 0-100% vol (resolution 0.01% vol; accuracy ±3% F.S).

[0020] The "vacuumizing module" refers to a device or equipment that uses mechanical, physical, chemical, or physical-chemical methods to pump gas out of a container to obtain a vacuum. For example, the vacuumizing module includes a vacuum pump, a vacuumizing pipeline connected to the vacuum pump and the carbonization kettle, and a control valve arranged on the vacuumizing pipeline.

[0021] The "air pressure detection module" refers to a sensor in which the pressure of a medium directly acts on the diaphragm of the sensor, causing the diaphragm to produce a micro-displacement proportional to the pressure of the medium, causing the resistance of the sensor to change, and detecting this change with an electronic circuit and converting it into a standard signal corresponding to the pressure. For example, the air pressure detection module is a vacuum pressure sensor, which detects the air pressure in the range of -0.09-1.00 MPa (accuracy ±0.001 MPa) and in the range of 0-80°C (accuracy ±0.5%).

[0022] The term "cooling and heating module" refers to equipment used to perform cooling and heating functions, pipes used to deliver cold and / or heat to the interior of the carbonization kettle, and electronic switches installed on the aforementioned equipment and / or control valves installed on the aforementioned pipes; for example, without limitation, the cooling and heating module may include heating rods installed inside the carbonization kettle, electronic switches installed on the heating rods, a blower chiller, a cold air delivery pipe connecting the blower chiller and the carbonization kettle, and control valves installed on the cold air delivery pipes.

[0023] The term "temperature detection module" refers to a sensor that can sense temperature and convert it into a usable output signal; for example, it can be a temperature sensor with a temperature detection range of 0~80℃ (accuracy ±0.5%).

[0024] The term "humidification module" refers to equipment for humidifying the carbonization reactor, a pipeline for supplying moisture to the interior of the carbonization reactor, and an electronic switch installed on the equipment and / or a control valve installed on the pipeline. For example, without limitation, the humidification module may include a steam generator, a steam supply pipeline connecting the steam generator and the carbonization reactor, and an electronic switch installed on the steam generator.

[0025] The term "humidity detection module" refers to a sensor that can sense humidity and convert it into a usable output signal; it is not limited to, for example, a humidity sensor with a humidity detection range of 0~100%RH (accuracy ±2%).

[0026] The term "electronic switch" refers to an operating unit that uses electronic circuits and power electronic devices to realize the switching of circuits, including at least one controllable electronic drive device; it is not limited to, for example, a relay electrically connected to a control module, a wireless switch, etc.

[0027] The term "control valve" refers to a valve consisting of a valve body assembly and an actuator assembly; it is not limited to, but can include, for example, gate valves, globe valves, ball valves, butterfly valves, check valves, regulating valves, pressure reducing valves, spring-loaded safety valves, three-way valves, four-way valves, etc., which are electrically or pneumatically controlled and electrically connected to a control module.

[0028] The term "control module" refers to a device used to receive information such as CO2 concentration, gas pressure, temperature, humidity, and carbonization time detected by the aforementioned detection module, and to selectively control the opening and closing of the carbon dioxide source delivery module, vacuum module, cooling and heating module, humidification module, and stirring carbonization unit or stirring granulation unit to achieve graded control of carbonization parameters. It can be, for example, a microcontroller, microprocessor, control panel, or main control chip. The test parameter control system can achieve graded control of gas concentration and pressure, temperature, humidity, and carbonization running time. The control module can be controlled through a step-by-step guided menu via software, and test parameters can be input on a touchscreen to achieve graded control of gas concentration and pressure, temperature, humidity, and carbonization running time.

[0029] Furthermore, in S1, the carbonization parameter grading and control unit also includes a carbon dioxide waste gas recovery device, the input end of which is connected to the interior of the carbonization kettle.

[0030] Furthermore, in step S1, the tray fixing unit includes a shelf arranged inside the carbonization reactor and multiple carbonization trays overlapping the shelf. The shelf is a 600mm × 600mm × 800mm (length × width × height) rack made of 304 stainless steel. During the primary carbonization process, 0.3~5.0kg of solid waste powder from the carbonization trays is placed on the shelf. Carbonization parameters such as CO2 concentration, gas pressure, temperature, humidity, and carbonization time are set to perform solid waste carbonization. The carbonized gas can be collected for repeated carbonization and finally treated by a carbon dioxide waste gas recovery device before being discharged.

[0031] Further, in step S1, the stirring carbonization unit includes a stirring pot arranged inside the carbonization vessel, a stirring motor mounted on the stirring pot, a vertical stirrer mounted on the output shaft of the stirring motor and arranged inside the stirring pot, and a gas vent opened on the stirring pot. The stirring pot has a diameter of 200-600 mm and is made of 304 stainless steel. During the secondary carbonization process, carbonization powder is placed on the stirring pot of the stirring system. Carbonization parameters such as the mass ratio of carbonization powder to water, stirring speed, CO2 concentration, gas pressure, temperature, humidity, and carbonization time are set to perform solid waste carbonization treatment. The carbonized gas can be collected for repeated carbonization and finally treated by a carbon dioxide waste gas recovery device before being discharged.

[0032] Further, in step S1, the stirring granulation unit includes a motor base arranged inside the carbonization reactor, a granulation motor and a scraper support mounted on the motor base, a granulation disc mounted on the output shaft of the granulation motor and inclined at 30-60° relative to the horizontal plane, and a granulation scraper mounted on the scraper support with its blade touching the surface of the granulation disc. The granulation disc has a diameter of 300-700 mm and is made of 304 stainless steel. During the three-stage carbonization process, the carbonized slurry is placed on the granulation disc, and carbonization parameters such as the granulation disc tilt angle, stirring speed, CO2 concentration, gas pressure, temperature, humidity, and carbonization time are set to perform solid waste carbonization treatment. The carbonized gas can be collected for repeated carbonization and finally discharged after treatment by a carbon dioxide waste gas recovery device.

[0033] Further, in S2, the solid waste powder is one or a combination of several of the following: iron tailings, fly ash, coal gangue, slag, steel slag, red mud, coal-fired furnace slag, and desulfurization gypsum, and the specific surface area of ​​the solid waste powder is ≥300 m². 2 / kg.

[0034] Furthermore, in S2, the CO2 concentration is set to 50~60%vol, the gas pressure to 0.1~0.4MPa, the temperature to 20~40℃, the humidity to 60~90%RH, and the carbonization time to 30~60min.

[0035] Furthermore, in S3, the mass ratio of carbonized powder to water is 1:0~3, and the stirring speed of the stirring carbonization unit is 300~1000 r / min.

[0036] Furthermore, in S3, the CO2 concentration is set to 50~70%vol, the gas pressure to 0.2~0.7MPa, the temperature to 30~60℃, the humidity to 60~90%RH, and the carbonization time to 30~60min.

[0037] Furthermore, in S4, the stirring speed of the stirring granulation unit is 40~50 r / min.

[0038] Furthermore, in S4, the CO2 concentration is set to 70~90%vol, the gas pressure to 0.4~0.7MPa, the temperature to 40~90℃, the humidity to 40~80%RH, and the carbonization time to 30~60min.

[0039] In summary, the beneficial technical effects of the present invention are as follows:

[0040] 1. This invention can achieve graded control of parameters such as carbon dioxide pressure, concentration, temperature, humidity, and carbonization time. While accelerating the reaction between solid waste and CO2, it can achieve multi-functional carbonization treatment of solid waste, produce carbonized particles with a particle size of less than 30 mm, and further improve the utilization rate of CO2 sequestration in solid waste.

[0041] 2. The solid waste carbonization chain of the present invention has the following three functions: (1) realizing large-scale direct carbonization of solid waste powder; (2) avoiding solid waste powder from escaping into the carbonization kettle during carbonization, realizing solid waste powder carbonization while stirring; (3) in the process of solid waste powder carbonization, it can also realize rapid granulation, which can increase the utilization rate of solid waste CO2 storage to about 30%, and the small particles of solid waste after carbonization can replace cement, and the large particles of carbonized solid waste granulated can replace coarse aggregate. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the solid waste carbonization chain in Embodiment 1 of the present invention.

[0043] Figure 2 This is a schematic diagram showing the connection relationship between the carbonization kettle and the carbonization parameter graded control unit in Embodiment 2 of the present invention.

[0044] Figure 3 This is a partial structural schematic diagram of the solid waste carbonization chain used for primary carbonization treatment in Embodiment 4 of the present invention.

[0045] Figure 4 This is a schematic diagram showing the connection relationship between the carbonization kettle, the tray fixing unit, and the carbonization parameter grading and control unit in Embodiment 4 of the present invention.

[0046] Figure 5 This is a partial structural schematic diagram of the solid waste carbonization chain used for secondary carbonization treatment in Embodiment 5 of the present invention.

[0047] Figure 6 This is a schematic diagram showing the connection relationship between the carbonization kettle, the stirring carbonization unit, and the carbonization parameter graded control unit in Embodiment 5 of the present invention.

[0048] Figure 7 This is a partial structural schematic diagram of the solid waste carbonization chain used for tertiary carbonization treatment in Embodiment 6 of the present invention.

[0049] Figure 8 This is a schematic diagram showing the connection relationship between the carbonization kettle, the stirring and granulation unit, and the carbonization parameter classification and control unit in Embodiment 6 of the present invention.

[0050] Figure 9 This is a schematic diagram of the structure of the carbonized particles obtained in Example 7 of the present invention.

[0051] In the diagram, 1. Carbonization kettle; 2. Carbonization parameter grading and control unit; 21. Carbon dioxide source delivery module; 211. Carbon dioxide storage tank; 212. Air compressor; 22. Carbon dioxide concentration detection module; 23. Vacuuming module; 231. Vacuum pump; 24. Gas pressure detection module; 25. Cooling and heating module; 251. Heating rod; 252. Fan-cooled chiller; 26. Temperature detection module; 27. Humidification module; 271. Steam generator; 28. Humidity detection module; 29. ​​Control module; 3. Tray fixing unit; 31. Shelf; 32. Carbonization tray; 4. Stirring carbonization unit; 41. Stirring pot; 42. Stirring motor; 43. Vertical stirrer; 44. Gas outlet; 5. Stirring granulation unit; 51. Motor base; 52. Granulation motor; 53. Scraper bracket; 54. Granulation scraper; 55. Granulation tray; 6. Carbon dioxide waste gas recovery equipment. Detailed Implementation

[0052] To make the technical means, creative features, objectives and effects of this invention clearer and easier to understand, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0053] Example 1: Refer to Figure 1 This invention discloses a method for carbonizing bulk solid waste based on the staged storage and utilization of carbon dioxide, comprising the following steps:

[0054] S1 establishes a solid waste carbonization chain, which includes multiple carbonization kettles 1, a carbonization parameter classification and control unit 2 set on the carbonization kettle 1, and a tray fixing unit 3, a stirring carbonization unit 4, and a stirring granulation unit 5 respectively arranged in the bodies of these carbonization kettles 1. The carbonization parameters of the carbonization parameter classification and control unit 2 include CO2 concentration, gas pressure, temperature, humidity and carbonization time.

[0055] S2 puts the solid waste powder into the tray fixing unit 3 for primary carbonization treatment, and sets the carbonization parameters of the carbonization parameter graded control unit 2 to obtain carbonized powder.

[0056] S3 adds carbonized powder, or carbonized powder and water, to the stirring carbonization unit 4 for secondary carbonization treatment, and sets the carbonization parameters of the carbonization parameter graded control unit 2 to obtain carbonized slurry.

[0057] S4 inputs the carbonized slurry into the mixing and granulation unit 5 for three-stage carbonization treatment, and sets the carbonization parameters of the graded control unit 2 to obtain carbonized particles.

[0058] Example 2: Refer to Figure 2This invention discloses a method for carbonizing bulk solid waste based on graded storage and utilization of carbon dioxide. The difference from Example 1 is that in S1, the internal diameter of the carbonization vessel 1 is 800~1200mm, the length is 800~1000mm, the maximum allowable pressure is 3MPa, and the material is 304 stainless steel.

[0059] Example 3: Reference Figure 1 and Figure 2 This invention discloses a method for carbonizing bulk solid waste based on the graded storage and utilization of carbon dioxide. The difference from Example 1 is that, in S1, the graded control unit 2 for carbonization parameters includes a carbon dioxide source delivery module 21, a carbon dioxide concentration detection module 22, a vacuum module 23, a pressure detection module 24, a cooling and heating module 25, a temperature detection module 26, a humidification module 27, a humidity detection module 28, and a control module 29; wherein…

[0060] The output end of the carbon dioxide source delivery module 21, the input end of the vacuum module 23, the output end of the cooling and heating module 25, and the output end of the humidification module 27 are connected to the interior of the carbonization kettle 1.

[0061] The carbon dioxide concentration detection module 22, the air pressure detection module 24, the temperature detection module 26, and the humidity detection module 28 are installed on the carbonization kettle 1 with the detection end facing the tray fixing unit 3, the stirring carbonization unit 4, or the stirring granulation unit 5.

[0062] The signal input terminal of the control module 29 is electrically connected to the carbon dioxide concentration detection module 22, the air pressure detection module 24, the temperature detection module 26, and the humidity detection module 28. The signal output terminal of the control module 29 is electrically connected to the carbon dioxide source delivery module 21, the vacuum module 23, the cooling and heating module 25, the humidification module 27, and the stirring carbonization unit 4 or the stirring granulation unit 5, so as to complete the control of carbonization parameters inside the carbonization kettle 1.

[0063] To ensure the accuracy of graded control of carbonization parameters, in the graded control unit 2 of this embodiment:

[0064] First, the carbon dioxide source delivery module 21 includes a carbon dioxide storage tank 211, a carbon dioxide delivery pipeline connecting the carbon dioxide storage tank 211 and the carbonization reactor 1, a control valve installed on the carbon dioxide delivery pipeline, an air compressor 212, an air delivery pipeline connecting the air compressor 212 and the carbonization reactor 1, and an electronic switch installed on the air compressor 212.

[0065] The carbon dioxide concentration detection module 22 is a carbon dioxide concentration sensor, which can detect CO2 concentration in the range of 0~100%vol (resolution 0.01%vol; accuracy ±3%FS).

[0066] The vacuum module 23 includes a vacuum pump 231, a vacuum pipe connecting the vacuum pump 231 and the carbonization vessel 1, and a control valve installed on the vacuum pipe.

[0067] The air pressure detection module 24 is a vacuum pressure sensor, which can detect air pressure in the range of -0.09~1.00MPa (accuracy ±0.001MPa) and in the range of 0~80℃ (accuracy ±0.5%).

[0068] The cooling and heating module 25 includes a heating rod 251 disposed inside the carbonization kettle 1, an electronic switch disposed on the heating rod 251, a fan chiller 252, a cold air delivery pipe connecting the fan chiller 252 and the carbonization kettle 1, and a control valve disposed on the cold air delivery pipe.

[0069] The temperature detection module 26 is a temperature sensor with a temperature detection range of 0~80℃ (accuracy ±0.5%).

[0070] The humidification module 27 includes a steam generator 271, a steam delivery pipe connecting the steam generator 271 and the carbonization kettle 1, and an electronic switch installed on the steam generator 271.

[0071] The humidity detection module 28 is a humidity sensor, which detects humidity in the range of 0~100%RH (accuracy ±2%).

[0072] Secondly, in the above modules, the electronic switches used are relays, wireless switches, etc., which are electrically connected to the control module 29; the control valves are gate valves, globe valves, ball valves, butterfly valves, check valves, regulating valves, pressure reducing valves, spring-loaded safety valves, three-way valves, four-way valves, etc., which are electrically or pneumatically controlled and electrically connected to the control module 29.

[0073] Finally, the control module 29 is used to receive information such as CO2 concentration, gas pressure, temperature, humidity, and carbonization time detected by the detection module, and selectively control the opening and closing of the carbon dioxide source delivery module 21, vacuum module 23, cooling and heating module 25, humidification module 27, and stirring carbonization unit 4 or stirring granulation unit 5 to complete the equipment for graded control of carbonization parameters. In this embodiment, a control panel is preferably used. The test parameter control system can realize graded control of gas concentration and pressure, temperature, humidity, and carbonization running time. The control module 29 can be controlled by a step-by-step guided menu through software and the test parameters can be input on the touch screen to realize graded control of gas concentration and pressure, temperature, humidity, and carbonization running time.

[0074] Example 4: Reference Figure 3 and Figure 4This invention discloses a method for carbonizing bulk solid waste based on graded carbon dioxide storage and utilization. The difference from Example 1 is that in S1, the tray fixing unit 3 includes a shelf 31 arranged inside the carbonization reactor 1, and multiple carbonization trays 32 overlapping the shelf 31. The shelf 31 is a 600mm × 600mm × 800mm (length × width × height) shelf made of 304 stainless steel. During the primary carbonization process, 0.3~5.0kg of solid waste powder from the carbonization trays 32 is placed on the shelf 31. Carbonization parameters such as CO2 concentration, gas pressure, temperature, humidity, and carbonization time are set to perform solid waste carbonization. The carbonized gas can be collected for repeated carbonization and finally discharged after treatment by the carbon dioxide waste gas recovery device 6.

[0075] Example 5: Refer to Figure 5 and Figure 6 This invention discloses a method for carbonizing bulk solid waste based on the staged storage and utilization of carbon dioxide. The difference from Example 1 is that, in S1, the stirring carbonization unit 4 includes a stirring pot 41 arranged inside the carbonization kettle 1, a stirring motor 42 mounted on the stirring pot 41, a vertical stirrer 43 mounted on the output shaft of the stirring motor 42 and arranged inside the stirring pot 41, and a gas flow port 44 opened on the stirring pot 41. The stirring pot 41 has a diameter of 200-600 mm and is made of 304 stainless steel. During the secondary carbonization process, carbonization powder is placed on the stirring pot 41 of the stirring system. Carbonization parameters such as the mass ratio of carbonization powder to water, stirring speed, CO2 concentration, gas pressure, temperature, humidity, and carbonization time are set to perform solid waste carbonization. The carbonized gas can be collected for repeated carbonization and finally discharged after treatment by the carbon dioxide waste gas recovery device 6.

[0076] Example 6: Refer to Figure 7 and Figure 8 This invention discloses a method for carbonizing bulk solid waste based on the graded storage and utilization of carbon dioxide. The difference from Example 1 is that, in S1, the stirring and granulation unit 5 includes a motor base 51 arranged inside the carbonization kettle 1, a granulation motor 52 and a scraper support 53 mounted on the motor base 51, a granulation disc 55 mounted on the output shaft of the granulation motor 52 and inclined at 30-60° relative to the horizontal plane, and a granulation scraper 54 mounted on the scraper support 53 with its blade touching the surface of the granulation disc 55. The granulation disc 55 has a diameter of 300-700 mm and is made of 304 stainless steel. During the three-stage carbonization process, the carbonized slurry is placed on the granulation disc 55. Carbonization parameters such as the tilt angle of the granulation disc 55, stirring speed, CO2 concentration, gas pressure, temperature, humidity, and carbonization time are set to perform solid waste carbonization. The carbonized gas can be collected for repeated carbonization and finally treated by the carbon dioxide waste gas recovery device 6 before being discharged.

[0077] Example 7: This is a method for carbonizing bulk solid waste based on the staged storage and utilization of carbon dioxide, as disclosed in this invention. The difference between this method and Examples 1-6 is that it includes the following steps:

[0078] S1 establishes a solid waste carbonization chain, which includes multiple carbonization kettles 1, a carbonization parameter classification and control unit 2 set on the carbonization kettle 1, and a tray fixing unit 3, a stirring carbonization unit 4, and a stirring granulation unit 5 respectively arranged in the bodies of these carbonization kettles 1. The carbonization parameters of the carbonization parameter classification and control unit 2 include CO2 concentration, gas pressure, temperature, humidity and carbonization time.

[0079] Weigh out 0.5 kg of S2, which has a specific surface area of ​​350 m². 2 / kg of iron tailings solid waste powder was put into tray fixing unit 3 for primary carbonization treatment, and the carbonization parameters of the carbonization parameter graded control unit were set: CO2 concentration of 50%vol, gas pressure of 0.1MPa, temperature of 20℃, humidity of 60%RH, and carbonization time of 60min to obtain carbonized powder.

[0080] S3 adds carbonized powder and water in a mass ratio of 1:3 to the stirring carbonization unit 4 for secondary carbonization treatment, and sets the carbonization parameters of the carbonization parameter graded control unit 2: stirring speed of 300 r / min, CO2 concentration of 50% vol, gas pressure of 0.3 MPa, temperature of 30℃, humidity of 70% RH, and carbonization time of 30 min to obtain carbonized slurry;

[0081] S4 inputs the carbonized slurry into the mixing and granulation unit 5 for three-stage carbonization treatment, and sets the carbonization parameters of the graded control unit 2: stirring speed 40 r / min, granulation disk tilt angle 30°, CO2 concentration 70% vol, gas pressure 0.5 MPa, temperature 40℃, humidity 80% RH, and carbonization time 30 min, obtaining carbonized particles (refer to...). Figure 9 According to the following formula (1), its CO2 gas absorption rate is 25.5%.

[0082] (1) ;

[0083] In the formula, m 500℃ The mass of steel slag powder before carbonization in the thermogravimetric analysis at 500℃ is expressed in mg; m 900℃ The mass of carbonized steel slag powder at 900℃ in the thermogravimetric analysis is expressed in mg; m 105℃ The value is the mass (mg) of the carbonized steel slag powder at 105℃ during the thermogravimetric analysis.

[0084] Example 8: This is a method for carbonizing bulk solid waste based on the staged storage and utilization of carbon dioxide, as disclosed in this invention. The difference from Example 7 is that it includes the following steps:

[0085] S1 establishes a solid waste carbonization chain, which includes multiple carbonization kettles 1, a carbonization parameter classification and control unit 2 set on the carbonization kettle 1, and a tray fixing unit 3, a stirring carbonization unit 4, and a stirring granulation unit 5 respectively arranged in the bodies of these carbonization kettles 1. The carbonization parameters of the carbonization parameter classification and control unit 2 include CO2 concentration, gas pressure, temperature, humidity and carbonization time.

[0086] Weigh out 0.5 kg of S2, which has a specific surface area of ​​400 m². 2 / kg of fly ash solid waste powder was put into tray fixing unit 3 for primary carbonization treatment, and the carbonization parameters of the carbonization parameter graded control unit were set as follows: CO2 concentration of 50%vol, gas pressure of 0.3MPa, temperature of 30℃, humidity of 60%RH, and carbonization time of 60min to obtain carbonized powder.

[0087] S3 adds carbonized powder and water in a mass ratio of 1:3 to the stirring carbonization unit 4 for secondary carbonization treatment, and sets the carbonization parameters of the carbonization parameter graded control unit 2: stirring speed of 300 r / min, CO2 concentration of 70% vol, gas pressure of 0.5 MPa, temperature of 40℃, humidity of 80% RH, and carbonization time of 60 min to obtain carbonized slurry;

[0088] S4 puts the carbonized slurry into the stirring and granulation unit 5 for three-stage carbonization treatment, and sets the carbonization parameters of the graded control unit 2. The stirring speed is 40 r / min, the tilt angle of the granulation disk is 30°, the CO2 concentration is 70% vol, the gas pressure is 0.5 MPa, the temperature is 40℃, the humidity is 80% RH, and the carbonization time is 30 min to obtain carbonized particles. According to the above formula (1), its CO2 gas absorption rate is 26.3%.

[0089] Example 9: This is a method for carbonizing bulk solid waste based on the staged storage and utilization of carbon dioxide, as disclosed in this invention. The difference from Example 7 is that it includes the following steps:

[0090] S1 establishes a solid waste carbonization chain, which includes multiple carbonization kettles 1, a carbonization parameter classification and control unit 2 set on the carbonization kettle 1, and a tray fixing unit 3, a stirring carbonization unit 4, and a stirring granulation unit 5 respectively arranged in the bodies of these carbonization kettles 1. The carbonization parameters of the carbonization parameter classification and control unit 2 include CO2 concentration, gas pressure, temperature, humidity and carbonization time.

[0091] S2 weighed 2.0 kg, with a specific surface area of ​​380 m². 2 / kg of coal gangue solid waste powder was fed into tray fixing unit 3 for primary carbonization treatment. The carbonization parameters of the carbonization parameter graded control unit were set as follows: CO2 concentration of 50%vol, gas pressure of 0.3MPa, temperature of 20℃, humidity of 90%RH, and carbonization time of 60min to obtain carbonized powder.

[0092] S3 adds carbonized powder and water in a mass ratio of 1:3 to the stirring carbonization unit 4 for secondary carbonization treatment, and sets the carbonization parameters of the carbonization parameter graded control unit 2: stirring speed of 300 r / min, CO2 concentration of 70% vol, gas pressure of 0.3 MPa, temperature of 40℃, humidity of 60% RH, and carbonization time of 60 min to obtain carbonized slurry;

[0093] S4 puts the carbonized slurry into the stirring and granulation unit 5 for three-stage carbonization treatment, and sets the carbonization parameters of the graded control unit 2. The stirring speed is 40 r / min, the tilt angle of the granulation disk is 30°, the CO2 concentration is 90% vol, the gas pressure is 0.5 MPa, the temperature is 90℃, the humidity is 40% RH, and the carbonization time is 60 min to obtain carbonized particles. According to the above formula (1), its CO2 gas absorption rate is 27.3%.

[0094] Example 10: This is a method for carbonizing bulk solid waste based on the staged storage and utilization of carbon dioxide, as disclosed in this invention. The difference from Example 7 is that it includes the following steps:

[0095] S1 establishes a solid waste carbonization chain, which includes multiple carbonization kettles 1, a carbonization parameter classification and control unit 2 set on the carbonization kettle 1, and a tray fixing unit 3, a stirring carbonization unit 4, and a stirring granulation unit 5 respectively arranged in the bodies of these carbonization kettles 1. The carbonization parameters of the carbonization parameter classification and control unit 2 include CO2 concentration, gas pressure, temperature, humidity and carbonization time.

[0096] S2 weighed 1.0 kg, with a specific surface area of ​​450 m². 2 / kg of steel slag solid waste powder was put into tray fixing unit 3 for primary carbonization treatment. The carbonization parameters of the carbonization parameter graded control unit were set as follows: CO2 concentration of 50%vol, gas pressure of 0.1MPa, temperature of 20℃, humidity of 60%RH, and carbonization time of 30min to obtain carbonized powder.

[0097] S3 adds carbonized powder and water in a mass ratio of 1:3 to the stirring carbonization unit 4 for secondary carbonization treatment, and sets the carbonization parameters of the carbonization parameter graded control unit 2: stirring speed of 300 r / min, CO2 concentration of 70% vol, gas pressure of 0.2 MPa, temperature of 40℃, humidity of 60% RH, and carbonization time of 60 min to obtain carbonized slurry;

[0098] S4 puts the carbonized slurry into the stirring and granulation unit 5 for three-stage carbonization treatment, and sets the carbonization parameters of the graded control unit 2. The stirring speed is 40 r / min, the tilt angle of the granulation disk is 30°, the CO2 concentration is 90% vol, the gas pressure is 0.4 MPa, the temperature is 90℃, the humidity is 60% RH, and the carbonization time is 60 min to obtain carbonized particles. According to the above formula (1), its CO2 gas absorption rate is 25.2%.

[0099] Example 11: This is a method for carbonizing bulk solid waste based on the staged storage and utilization of carbon dioxide, as disclosed in this invention. The difference from Example 7 is that it includes the following steps:

[0100] S1 establishes a solid waste carbonization chain, which includes multiple carbonization kettles 1, a carbonization parameter classification and control unit 2 set on the carbonization kettle 1, and a tray fixing unit 3, a stirring carbonization unit 4, and a stirring granulation unit 5 respectively arranged in the bodies of these carbonization kettles 1. The carbonization parameters of the carbonization parameter classification and control unit 2 include CO2 concentration, gas pressure, temperature, humidity and carbonization time.

[0101] Weigh out 0.3 kg of S2, which has a specific surface area of ​​400 m². 2 / kg of fly ash solid waste powder was put into tray fixing unit 3 for primary carbonization treatment, and the carbonization parameters of the carbonization parameter graded control unit were set as follows: CO2 concentration of 60%vol, gas pressure of 0.1MPa, temperature of 20℃, humidity of 60%RH, and carbonization time of 30min to obtain carbonized powder.

[0102] S3 adds carbonized powder and water in a mass ratio of 1:3 to the stirring carbonization unit 4 for secondary carbonization treatment, and sets the carbonization parameters of the carbonization parameter graded control unit 2: stirring speed of 300 r / min, CO2 concentration of 70% vol, gas pressure of 0.4 MPa, temperature of 40℃, humidity of 90% RH, and carbonization time of 30 min to obtain carbonized slurry;

[0103] S4 puts the carbonized slurry into the stirring and granulation unit 5 for three-stage carbonization treatment, and sets the carbonization parameters of the graded control unit 2. The stirring speed is 40 r / min, the tilt angle of the granulation disk is 30°, the CO2 concentration is 90% vol, the gas pressure is 0.7 MPa, the temperature is 60℃, the humidity is 80% RH, and the carbonization time is 60 min to obtain carbonized particles. According to the above formula (1), its CO2 gas absorption rate is 29.8%.

[0104] Example 12: This is a method for carbonizing bulk solid waste based on the staged storage and utilization of carbon dioxide, as disclosed in this invention. The difference from Example 7 is that it includes the following steps:

[0105] S1 establishes a solid waste carbonization chain, which includes multiple carbonization kettles 1, a carbonization parameter classification and control unit 2 set on the carbonization kettle 1, and a tray fixing unit 3, a stirring carbonization unit 4, and a stirring granulation unit 5 respectively arranged in the bodies of these carbonization kettles 1. The carbonization parameters of the carbonization parameter classification and control unit 2 include CO2 concentration, gas pressure, temperature, humidity and carbonization time.

[0106] S2 weighed 2.5 kg, with a specific surface area of ​​440 m². 2 / kg of coal gangue solid waste powder was fed into tray fixing unit 3 for primary carbonization treatment. The carbonization parameters of the carbonization parameter graded control unit were set as follows: CO2 concentration of 60%vol, gas pressure of 0.4MPa, temperature of 40℃, humidity of 60%RH, and carbonization time of 30min to obtain carbonized powder.

[0107] S3 adds carbonized powder and water in a mass ratio of 1:3 to the stirring carbonization unit 4 for secondary carbonization treatment, and sets the carbonization parameters of the carbonization parameter graded control unit 2: stirring speed of 300 r / min, CO2 concentration of 70% vol, gas pressure of 0.7 MPa, temperature of 60℃, humidity of 75% RH, and carbonization time of 60 min to obtain carbonized slurry;

[0108] S4 puts the carbonized slurry into the stirring and granulation unit 5 for three-stage carbonization treatment, and sets the carbonization parameters of the graded control unit 2. The stirring speed is 50 r / min, the tilt angle of the granulation disk is 45°, the CO2 concentration is 90% vol, the gas pressure is 1.0 MPa, the temperature is 80℃, the humidity is 95% RH, and the carbonization time is 30 min to obtain carbonized particles. According to the above formula (1), its CO2 gas absorption rate is 25.3%.

[0109] Example 13: This is a method for carbonizing bulk solid waste based on the staged storage and utilization of carbon dioxide, as disclosed in this invention. The difference from Example 7 is that it includes the following steps:

[0110] S1 establishes a solid waste carbonization chain, which includes multiple carbonization kettles 1, a carbonization parameter classification and control unit 2 set on the carbonization kettle 1, and a tray fixing unit 3, a stirring carbonization unit 4, and a stirring granulation unit 5 respectively arranged in the bodies of these carbonization kettles 1. The carbonization parameters of the carbonization parameter classification and control unit 2 include CO2 concentration, gas pressure, temperature, humidity and carbonization time.

[0111] Weigh out 0.8 kg of S2, which has a specific surface area of ​​400 m². 2 / kg of desulfurized gypsum solid waste powder was put into tray fixing unit 3 for primary carbonization treatment. The carbonization parameters of the carbonization parameter graded control unit were set as follows: CO2 concentration of 60%vol, gas pressure of 0.3MPa, temperature of 20℃, humidity of 80%RH, and carbonization time of 30min to obtain carbonized powder.

[0112] S3 adds carbonized powder and water in a mass ratio of 1:3 to the stirring carbonization unit 4 for secondary carbonization treatment, and sets the carbonization parameters of the carbonization parameter graded control unit 2: stirring speed of 300 r / min, CO2 concentration of 90% vol, gas pressure of 0.5 MPa, temperature of 40℃, humidity of 90% RH, and carbonization time of 30 min to obtain carbonized slurry;

[0113] S4 puts the carbonized slurry into the stirring and granulation unit 5 for three-stage carbonization treatment, and sets the carbonization parameters of the graded control unit 2. The stirring speed is 40 r / min, the tilt angle of the granulation disk is 30°, the CO2 concentration is 70% vol, the gas pressure is 0.5 MPa, the temperature is 40℃, the humidity is 80% RH, and the carbonization time is 30 min to obtain carbonized particles. According to the above formula (1), its CO2 gas absorption rate is 28.7%.

[0114] Example 14: This is a method for carbonizing bulk solid waste based on the staged storage and utilization of carbon dioxide, as disclosed in this invention. The difference from Example 7 is that it includes the following steps:

[0115] S1 establishes a solid waste carbonization chain, which includes multiple carbonization kettles 1, a carbonization parameter classification and control unit 2 set on the carbonization kettle 1, and a tray fixing unit 3, a stirring carbonization unit 4, and a stirring granulation unit 5 respectively arranged in the bodies of these carbonization kettles 1. The carbonization parameters of the carbonization parameter classification and control unit 2 include CO2 concentration, gas pressure, temperature, humidity and carbonization time.

[0116] Weigh out 0.5 kg of S2, which has a specific surface area of ​​400~450 m². 2 The solid waste powder of slag (the mass ratio of steel slag to slag is 1:2) per kg was put into the tray fixing unit 3 for primary carbonization treatment. The carbonization parameters of the carbonization parameter graded control unit were set as follows: CO2 concentration of 60%vol, gas pressure of 0.1MPa, temperature of 20℃, humidity of 60%RH, and carbonization time of 30min to obtain carbonized powder.

[0117] S3 adds carbonized powder and water in a mass ratio of 1:3 to the stirring carbonization unit 4 for secondary carbonization treatment, and sets the carbonization parameters of the carbonization parameter graded control unit 2: stirring speed of 300 r / min, CO2 concentration of 70% vol, gas pressure of 0.3 MPa, temperature of 40℃, humidity of 90% RH, and carbonization time of 30 min to obtain carbonized slurry;

[0118] S4 puts the carbonized slurry into the stirring and granulation unit 5 for three-stage carbonization treatment, and sets the carbonization parameters of the graded control unit 2. The stirring speed is 45 r / min, the tilt angle of the granulation disk is 42°, the CO2 concentration is 90% vol, the gas pressure is 0.5 MPa, the temperature is 60℃, the humidity is 90% RH, and the carbonization time is 60 min to obtain carbonized particles. According to the above formula (1), its CO2 gas absorption rate is 27.6%.

[0119] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for carbonization of bulk solid waste based on hierarchical carbon dioxide storage utilization, characterized by: The method comprises the following steps, S1, establishing a solid waste carbonization chain, the solid waste carbonization chain comprising a plurality of carbonization kettles, a carbonization parameter hierarchical regulation and control unit arranged on the carbonization kettles, and a tray fixing unit, a stirring carbonization unit and a stirring granulation unit arranged in the carbonization kettles respectively, the carbonization parameters of the carbonization parameter hierarchical regulation and control unit comprising CO2 concentration, air pressure, temperature, humidity and carbonization time; S2, feeding solid waste powder into the tray fixing unit for primary carbonization treatment, and setting the carbonization parameters of the carbonization parameter hierarchical regulation and control unit, the CO2 concentration being set to 50-60%vol, the air pressure being set to 0.1-0.4 MPa, the temperature being set to 20-40℃, the humidity being set to 60-90%RH, and the carbonization time being set to 30-60 min, to obtain carbonized powder; S3, feeding the carbonized powder or the carbonized powder and water into the stirring carbonization unit for secondary carbonization treatment, the mass ratio of the carbonized powder and water being 1:0-3, and setting the carbonization parameters of the carbonization parameter hierarchical regulation and control unit, the stirring speed of the stirring carbonization unit being set to 300-1000 r / min, the CO2 concentration being set to 50-70%vol, the air pressure being set to 0.2-0.7 MPa, the temperature being set to 30-60℃, the humidity being set to 60-90%RH, and the carbonization time being set to 30-60 min, to obtain carbonized slurry; S4, feeding the carbonized slurry into the stirring granulation unit for tertiary carbonization treatment, and setting the carbonization parameters of the carbonization parameter hierarchical regulation and control unit, the stirring speed of the stirring granulation unit being set to 40-50 r / min, the inclination angle of the granulation disc of the stirring granulation unit being set to 30-60°, the CO2 concentration being set to 70-90%vol, the air pressure being set to 0.4-0.7 MPa, the temperature being set to 40-90℃, the humidity being set to 40-80%RH, and the carbonization time being set to 30-60 min, to obtain carbonized particles.

2. The method according to claim 1, wherein the method is characterized in that: In the S1, the carbonization parameter hierarchical regulation and control unit comprises a carbon dioxide source conveying module, a carbon dioxide concentration detection module, a vacuum pumping module, an air pressure detection module, a refrigeration and heating module, a temperature detection module, a humidification module, a humidity detection module, and a control module; wherein, the output end of the carbon dioxide source conveying module, the input end of the vacuum pumping module, the output end of the refrigeration and heating module, and the output end of the humidification module are communicated with the inside of the carbonization kettle; the carbon dioxide concentration detection module, the air pressure detection module, the temperature detection module, and the humidity detection module are installed on the carbonization kettle in a manner that the detection ends face the tray fixing unit, the stirring carbonization unit or the stirring granulation unit; the signal input end of the control module is electrically connected to the carbon dioxide concentration detection module, the air pressure detection module, the temperature detection module, and the humidity detection module, and the signal output end of the control module is electrically connected to the carbon dioxide source conveying module, the vacuum pumping module, the refrigeration and heating module, the humidification module, and the stirring carbonization unit or the stirring granulation unit, to complete the regulation and control of the carbonization parameters in the inside of the carbonization kettle.

3. The method according to claim 1, wherein the method is characterized by: In the S1, the stirring carbonization unit comprises a stirring pot arranged in a carbonization kettle body, a stirring motor arranged on the stirring pot, a vertical stirrer arranged on an output shaft of the stirring motor and in the stirring pot, and a gas flow port opened on the stirring pot.

4. The method according to claim 1, wherein the method is characterized by: In the S1, the stirring granulation unit comprises a motor base arranged in a carbonization kettle body, a granulation motor and a scraper support arranged on the motor base, a granulation disc arranged on an output shaft of the granulation motor and inclined by 30-60° relative to a horizontal plane, and a granulation scraper arranged on the scraper support and with a blade edge overlapping a surface of the granulation disc.

5. The method according to claim 1, wherein the method is characterized by: In the S2, the solid waste powder is one or a combination of iron tailings, fly ash, coal gangue, slag, steel slag, red mud, coal combustion slag and desulfurization gypsum, and the specific surface area of the solid waste powder is ≥300 m 2 / kg.

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