Manufacturing method for producing activated carbon from decoration garbage

Abstract

The invention relates to the technical field of waste resource reutilization, in particular to a manufacturing method for producing activated carbon from decoration garbage, which comprises the following steps: crushing the decoration garbage by a crusher, and sequentially passing through a magnetic separator and a winnowing machine to obtain wood crushed aggregates; then the wood crushed aggregates are heated, and the heating mode of the wood crushed aggregates is determined according to the sound wave attenuation rate of the wood crushed aggregates; when it is judged that the heated and screened wood crushed aggregates do not reach the standard according to the conductivity, a surface temperature uniformity characterization value and a thermal response characterization value are obtained; when it is judged that the heated and screened wood crushed aggregates do not reach the standard according to the conductivity, whether the heated and screened wood crushed aggregates meet the preset standard or not is judged secondarily according to the surface temperature uniformity characterization value, or the reason that the heated and screened wood crushed aggregates do not reach the standard is determined according to the thermal response characterization value; and the heated and screened wood crushed aggregates reaching the standard are carbonized and activated in sequence to obtain the activated carbon, so that the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of waste resource recycling, and in particular to a method for producing activated carbon from decoration waste. Background Art

[0002] Renovation waste is a complex material, primarily consisting of wood chips, plastics, metals, paint scraps, adhesives, and sediment. Traditionally, landfill or incineration is the primary method for its disposal, which not only consumes land resources but also can cause secondary pollution. In recent years, resource utilization has become a key focus in the management of renovation waste.

[0003] The activated carbon preparation process mostly uses raw materials such as wood and coconut shells. The wood fragments in renovation waste are often mixed with adhesives, metal particles and mud and sand. Direct carbonization will lead to pore blockage and residual impurities, significantly reducing the adsorption performance of activated carbon.

[0004] The method of preparing activated carbon from renovation waste usually includes steps such as crushing, sorting, carbonization and activation. However, magnetic separation and air separation cannot completely remove the metal particles and adhering adhesives embedded in the wood chips. Residual impurities cause the pore structure to be destroyed during the carbonization process. Fixed temperature heating cannot adapt to wood chips with different degrees of pollution, resulting in local overheating or insufficient heating.

[0005] Chinese patent application publication number CN103130221A discloses a method for producing activated carbon from household waste. The waste is removed of impurities such as metal and sand, washed to remove dirt, sun-dried, crushed, and sieved through a 100-mesh sieve. The mixture is then heated to 400-900°C for 10-60 minutes to precipitate pyrolyzed products. A binder is then added and thoroughly stirred. The mixture is then formed into blocks of a desired size and placed in a tubular roaster at 600-1500°C. Steam is introduced for activation for a specified period of time, followed by cooling to produce the activated carbon.

[0006] It can be seen that the above technical solution does not detect the acoustic wave attenuation rate of the raw materials, and cannot quantify the degree of adhesive adhesion in the wood chips, resulting in a single selection of heating mode. The conductivity or thermal response characterization value is not used to accurately determine the type of residual impurities, and it is impossible to distinguish between metal particles and mud and sand residues. As a result, subsequent processing relies solely on physical screening, which leads to low production efficiency. Summary of the Invention

[0007] To this end, the present invention provides a method for producing activated carbon from renovation waste, which is used to overcome the problems in the prior art that the sound wave attenuation rate of the raw materials is not detected, the degree of adhesion of the adhesive in the wood chips cannot be quantified, resulting in a single heating mode selection, and the type of residual impurities cannot be accurately determined by using conductivity or thermal response characterization values. It is impossible to distinguish between metal particles and mud and sand residues, resulting in subsequent processing relying solely on physical screening, which leads to low production efficiency.

[0008] To achieve the above object, the present invention provides a method for producing activated carbon from decoration waste, comprising:

[0009] The renovation waste is crushed by a crusher, and then passed through a magnetic separator and an air separator to obtain wood chips, and the sound wave attenuation rate of the wood chips is obtained by an ultrasonic transmitter;

[0010] Heating the wood chips, wherein a heating mode for the wood chips is determined according to an acoustic wave attenuation rate of the wood chips;

[0011] The heated wood chips are screened by a vibrating screen and then measured using a four-probe conductivity meter to obtain the conductivity of the wood chips;

[0012] When it is determined based on the electrical conductivity that the heated and screened wood chips do not meet the preset standard, obtaining the surface temperature of the wood chips, and obtaining a surface temperature uniformity characterization value of the wood chips and a thermal response characterization value of the wood chips;

[0013] When it is determined that the heated and screened wood chips do not meet the preset standard based on the electrical conductivity, a second determination is made based on the surface temperature uniformity characterization value whether the heated and screened wood chips meet the preset standard, or a determination is made based on the thermal response characterization value of the wood chips why the heated and screened wood chips do not meet the preset standard;

[0014] The heated and screened wood chips that meet preset standards are carbonized and activated in sequence to obtain activated carbon.

[0015] Furthermore, the heating mode of the wood chips includes three heating modes, wherein:

[0016] The first heating mode is to select a first preset temperature to heat the wood chips for a first preset heating time;

[0017] The second heating mode is to heat the wood chips from the second preset temperature to a third preset temperature according to a preset temperature gradient;

[0018] The third heating mode is to place the wood chips under the conditions of a fourth preset temperature and a preset pressure and heat them for a second preset heating time.

[0019] Furthermore, the heating mode of the wood chips is determined according to the acoustic wave attenuation rate of the wood chips, wherein:

[0020] If the sound wave attenuation rate is less than the first preset sound wave attenuation rate, determining to select the first heating mode;

[0021] If the sound wave attenuation rate is greater than or equal to the first preset sound wave attenuation rate and less than the second preset sound wave attenuation rate, determining to select the second heating mode;

[0022] If the sound wave attenuation rate is greater than or equal to the second preset sound wave attenuation rate, it is determined that the third heating mode is selected.

[0023] Furthermore, the process of determining whether the heated and screened wood chips do not meet a preset standard according to the electrical conductivity of the wood chips includes:

[0024] comparing the conductivity with a first preset conductivity and a second preset conductivity respectively;

[0025] If the electrical conductivity is greater than or equal to the first preset electrical conductivity and less than the second preset electrical conductivity, it is determined that the wood chips after heating and screening do not meet the preset standard, and a second determination is made based on the surface temperature uniformity characteristic value whether the wood chips after heating and screening meet the preset standard;

[0026] If the electrical conductivity is greater than or equal to a second preset electrical conductivity, it is determined that the heated and screened wood chips do not meet the preset standard, and the reason why the heated and screened wood chips do not meet the preset standard is determined based on the thermal response characterization value of the wood chips.

[0027] Furthermore, a secondary determination is made as to whether the heated and screened wood chips meet a preset standard based on the surface temperature uniformity characterization value, wherein:

[0028] If the surface temperature uniformity characterization value is less than a preset surface temperature uniformity characterization value, it is determined that the wood chips after heating and screening meet the preset standard;

[0029] If the surface temperature uniformity characterization value is greater than or equal to a preset surface temperature uniformity characterization value, it is determined that the wood chips after heating and screening do not meet the preset standard, and the heating mode of the wood chips is optimized;

[0030] The surface temperature uniformity characterization value is the standard deviation of the surface temperature of the wood chips.

[0031] Furthermore, under the condition that the wood chips after heating and screening are secondarily determined not to meet a preset standard according to the surface temperature uniformity characterization value, the process of optimizing the heating mode of the wood chips includes:

[0032] Under the condition that the heating mode of the wood chips is the first heating mode, reducing the first preset heating time according to the difference between the surface temperature uniformity characterization value and the preset surface temperature uniformity characterization value;

[0033] Under the condition that the heating mode of the wood chips is the second heating mode, reducing the temperature increase gradient according to the ratio between the surface temperature uniformity characterization value and a preset surface temperature uniformity characterization value;

[0034] Under the condition that the heating mode of the wood chips is the third heating mode, the pressure is increased according to the relative difference between the surface temperature uniformity characterizing value and a preset surface temperature uniformity characterizing value.

[0035] Furthermore, several pressure regulation modes are provided for increasing the pressure, and each pressure regulation mode increases the pressure by a different amount.

[0036] Furthermore, the reason why the heated and screened wood chips do not meet the preset standards is determined based on the thermal response characterization value of the wood chips, wherein:

[0037] If the thermal response characterization value is less than a preset thermal response characterization value, it is determined that the reason why the wood chips after heat screening do not meet the preset standard is that there are residual mud and sand particles, and the wood chips are acid-washed;

[0038] If the thermal response characterization value is greater than or equal to a preset thermal response characterization value, it is determined that the reason why the wood chips after heat screening do not meet the preset standard is that there are residual metal particles. The wood chips are sorted by an eddy current separator and the speed of the eddy current separator is determined according to the difference between the thermal response characterization value and the preset thermal response characterization value.

[0039] Furthermore, the thermal response characterization value is an average temperature rise rate of the surface temperature of the wood chips within a third preset heating time.

[0040] Furthermore, the rotation speed of the eddy current separator is determined according to the thermal response characteristic difference, wherein,

[0041] If the thermal response characteristic difference is less than a first preset thermal response characteristic difference, determining that the rotational speed of the eddy current separator is a first rotational speed;

[0042] If the thermal response characterization difference is greater than or equal to a first preset thermal response characterization difference and less than a second preset thermal response characterization difference, determining that the rotational speed of the eddy current separator is a second rotational speed;

[0043] If the thermal response characteristic difference is greater than or equal to a second preset thermal response characteristic difference, determining that the rotational speed of the eddy current separator is a third rotational speed;

[0044] The thermal response characterization difference is the difference between the thermal response characterization value and the preset thermal response characterization value; the first speed is less than the second speed, the second speed is greater than the first speed and less than the third speed, and the third speed is greater than the second speed.

[0045] Compared with the existing technology, the beneficial effect of the present invention is that the present invention reduces landfill pollution by converting the wood components in the renovation waste into high-value-added activated carbon. After the renovation waste is crushed and sorted, the heating mode is dynamically adjusted based on the sound wave attenuation rate to adapt to wood chips with different adhesive residue levels; and combined with multi-dimensional detection of electrical conductivity, temperature uniformity and thermal response, the screening efficiency is improved and the purity of the wood chips is thereby improved, achieving efficient carbonization and activation of the wood chips, thereby improving production efficiency.

[0046] Furthermore, the present invention sets the sound wave attenuation rate to quickly quantify the amount of adhesive residue, thereby achieving precise matching of the heating mode and the amount of adhesive residue: constant temperature heating is performed on wood chips with little adhesive residue; gradient heating is performed on wood chips with medium adhesive residue to gradually soften the adhesive and avoid local carbonization and pore blockage; gradient heating is performed on wood chips with high adhesive residue using high-pressure steam, and pressure is used to synergistically peel off stubborn adhesives, systematically solving core problems such as the difficulty in removing adhesive residues in wood chips from renovation waste, high heating energy consumption, and unstable activated carbon performance, thereby improving the production efficiency of activated carbon.

[0047] Furthermore, the present invention verifies the effect of heating, screening and removing impurities from the wood chips by comparing the electrical conductivity of the wood chips with the first preset electrical conductivity and the second preset electrical conductivity, and performs multi-level judgment in combination with the surface temperature uniformity characterization value and the thermal response characterization value, thereby achieving accurate identification of impurity residues and closed-loop control of process defects, thereby improving the activated carbon preparation effect.

[0048] Furthermore, the present invention reflects the heating uniformity by setting a surface temperature standard deviation. The larger the surface temperature standard deviation, the more uneven the temperature distribution. The surface temperature standard deviation is used to make a secondary judgment on the effect of the wood chips after heating and screening, and the heating mode is optimized to avoid local overheating or insufficient heating of the wood chips during heating, thereby improving the uniformity of the activated carbon pore distribution.

[0049] Furthermore, the present invention dynamically adjusts the process parameters of the heating mode according to the surface temperature uniformity characterization value. In the first heating mode, the heating time is shortened to reduce local overheating; in the second heating mode, the temperature rise gradient is reduced to allow heat to penetrate more evenly into the wood chips; in the third heating mode, the pressure is increased to alleviate the uneven temperature distribution, thereby achieving dynamic optimization of the heating mode.

[0050] Furthermore, the present invention achieves a closed-loop linkage between impurity type and sorting parameters by comparing the thermal response characterization value of wood chips with a preset threshold value. The mud and sand particles have high heat capacity and poor thermal conductivity, which causes the temperature of the wood chips to rise slowly. The mud and sand can be efficiently removed by acid washing; the metal has high thermal conductivity, which accelerates heat transfer and causes the surface temperature to rise rapidly, thereby improving the purity of the raw materials used for activated carbon preparation.

[0051] Furthermore, the present invention determines the rotation speed of the eddy current separator by means of the difference in thermal response characterization, thereby achieving precise control of the rotation speed of the eddy current separator. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a flow chart of a method for producing activated carbon from renovation waste according to an embodiment of the present invention;

[0053] Figure 2 This is a flow chart of determining a heating mode for wood chips according to the acoustic wave attenuation rate of the wood chips according to an embodiment of the present invention;

[0054] Figure 3 This is a flow chart of an embodiment of the present invention for determining whether the heated and screened wood chips meet the preset standards based on electrical conductivity;

[0055] Figure 4 This is a flow chart of an embodiment of the present invention for determining why heated and screened wood chips do not meet preset standards. DETAILED DESCRIPTION

[0056] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention.

[0057] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0058] It should be pointed out that the data in this embodiment are all obtained by comprehensive analysis and evaluation of the historical test data of the present invention in the three months before this test and the corresponding historical test results. Those skilled in the art can understand that the method of determining the above-mentioned single parameter of the method of the present invention can be to select the value with the highest proportion as the preset standard parameter according to the data distribution, use weighted summation to use the obtained value as the preset standard parameter, substitute each historical data into a specific formula and use the value obtained by the formula as the preset standard parameter or other selection methods, as long as the method of the present invention can clearly define the different specific situations in the single determination process through the obtained value.

[0059] See also Figure 1 、 Figure 2 、 Figure 3 as well as Figure 4As shown, it is a flow chart of a method for producing activated carbon from decoration waste according to an embodiment of the present invention; a flow chart of determining a heating mode for wood chips according to the acoustic wave attenuation rate of the wood chips according to an embodiment of the present invention; a flow chart of determining whether the wood chips after heating and screening meet the preset standards according to the electrical conductivity according to an embodiment of the present invention; and a flow chart of determining the reason why the wood chips after heating and screening do not meet the preset standards according to an embodiment of the present invention.

[0060] The embodiment of the present invention provides a method for producing activated carbon from decoration waste, comprising:

[0061] Step S1: After the renovation waste is crushed by a jaw crusher to a particle size of less than 50 mm, the crushed material passes through a magnetic separator with a magnetic field strength set to 0.8 T to remove magnetic metal impurities, and then passes through an air separator with an air flow speed set to 15 m / s to obtain wood chips, and the sound wave attenuation rate of the wood chips is obtained by an ultrasonic transmitter;

[0062] Step S2, heating the wood chips, wherein a heating mode for the wood chips is determined according to the sound wave attenuation rate of the wood chips;

[0063] Step S3, screening the heated wood chips through a vibrating screen with an aperture of 10 mesh, and then measuring the electrical conductivity of the wood chips using a four-probe conductivity meter;

[0064] Step S4, when it is determined based on the electrical conductivity that the heated and screened wood chips do not meet the preset standard, obtaining the surface temperature of the wood chips, and obtaining a surface temperature uniformity characterization value of the wood chips and a thermal response characterization value of the wood chips;

[0065] Step S5, when it is determined based on the electrical conductivity that the heated and screened wood chips do not meet the preset standard, a second determination is made based on the surface temperature uniformity characterization value whether the heated and screened wood chips meet the preset standard, or a reason why the heated and screened wood chips do not meet the preset standard is determined based on the thermal response characterization value of the wood chips;

[0066] Step S6, carbonizing the heated and screened wood chips that meet the preset standards at 500° C. for 1 hour under nitrogen protection, and then activating them with water vapor at 850° C. for 2 hours to obtain activated carbon.

[0067] Specifically, the heating mode of the wood chips includes three heating modes, wherein:

[0068] The first heating mode is to select a first preset temperature of 180° C. to heat the wood chips for a first preset heating time of 1.5 hours;

[0069] The second heating mode is to heat the wood chips from the second preset temperature of 80°C to the third preset temperature of 150°C according to a preset temperature increase gradient of 10°C / h;

[0070] The third heating mode is to place the wood chips at a fourth preset temperature of 160° C. and a preset pressure of 1.5 MPa for a second preset heating time of 2 hours.

[0071] Specifically, the heating mode of the wood chips is determined according to the acoustic wave attenuation rate of the wood chips, wherein:

[0072] If the acoustic wave attenuation rate is less than the first preset acoustic wave attenuation rate of 8 dB / cm, determining to select the first heating mode;

[0073] If the acoustic wave attenuation rate is greater than or equal to the first preset acoustic wave attenuation rate and less than the second preset acoustic wave attenuation rate of 12 dB / cm, then the second heating mode is selected;

[0074] If the sound wave attenuation rate is greater than or equal to the second preset sound wave attenuation rate, it is determined that the third heating mode is selected.

[0075] By comparing the sound wave attenuation rates, the degree of adhesive residue in the wood chips can be determined and the purity of the wood chips can be detected in real time.

[0076] Specifically, the value range of the first preset sound wave attenuation rate is (5dB / cm, 10dB / cm), and the value range of the second preset sound wave attenuation rate is (11dB / cm, 15dB / cm). Preferably, the first preset sound wave attenuation rate is selected as 8dB / cm, and the second preset sound wave attenuation rate is selected as 12dB / cm.

[0077] Specifically, the process of determining whether the heated and screened wood chips meet a preset standard based on the electrical conductivity of the wood chips includes:

[0078] Comparing the conductivity with a first preset conductivity of 0.15 S / m and a second preset conductivity of 0.4 S / m respectively;

[0079] If the electrical conductivity is less than the first preset electrical conductivity, it is determined that the heated and screened wood chips meet the preset standard;

[0080] If the electrical conductivity is greater than or equal to the first preset electrical conductivity and less than the second preset electrical conductivity, it is determined that the wood chips after heating and screening do not meet the preset standard, and a second determination is made based on the surface temperature uniformity characteristic value whether the wood chips after heating and screening meet the preset standard;

[0081] If the electrical conductivity is greater than or equal to a second preset electrical conductivity, it is determined that the heated and screened wood chips do not meet the preset standard, and the reason why the heated and screened wood chips do not meet the preset standard is determined based on the thermal response characterization value of the wood chips.

[0082] In this embodiment, the value range of the first preset conductivity is (0.05S / m, 0.20S / m), and the value range of the second preset conductivity is (0.25S / m, 0.45S / m). Preferably, the preferred embodiment of the first preset conductivity is 0.15S / m, and the preferred embodiment of the second preset conductivity is 0.4S / m.

[0083] Specifically, dry and pure wood is an insulator with low electrical conductivity, but the wood chips in renovation waste have significantly higher electrical conductivity due to the metal residue; when there is residual mud and sand, it can conduct electricity weakly. In addition, the moisture in the wood chips will increase the electrical conductivity.

[0084] Specifically, a secondary determination is made as to whether the heated and screened wood chips meet a preset standard based on the surface temperature uniformity characteristic value, wherein:

[0085] If the surface temperature uniformity representation value is less than the preset surface temperature uniformity representation value by 0.5° C., it is determined that the wood chips after heating and screening meet the preset standard;

[0086] If the surface temperature uniformity characterization value is greater than or equal to a preset surface temperature uniformity characterization value, it is determined that the wood chips after heating and screening do not meet the preset standard, and the heating mode of the wood chips is optimized;

[0087] The surface temperature uniformity characterization value is the standard deviation of the surface temperature of the wood chips.

[0088] Specifically, the thermal image of the surface temperature of the wood chips is obtained by an infrared thermal imager, and the standard deviation of the surface temperature is obtained by the analysis software MATLAB.

[0089] In this embodiment, the preset surface temperature uniformity characterization value is 0.5°C. The preset surface temperature uniformity characterization value is obtained by taking the average value of the surface temperature uniformity characterization value while ensuring that the adhesive is fully decomposed when the wood chips are heated while avoiding premature carbonization. However, the above value is not limited to this, and those skilled in the art can also adjust the value according to actual needs.

[0090] Specifically, under the condition that the wood chips after heating and screening are secondarily determined not to meet the preset standard according to the surface temperature uniformity characterization value, the process of optimizing the heating mode of the wood chips includes:

[0091] Under the condition that the heating mode of the wood chips is the first heating mode, reducing the first preset heating time according to the difference between the surface temperature uniformity characterization value and the preset surface temperature uniformity characterization value;

[0092] Under the condition that the heating mode of the wood chips is the second heating mode, reducing the temperature increase gradient according to the ratio between the surface temperature uniformity characterization value and a preset surface temperature uniformity characterization value;

[0093] Under the condition that the heating mode of the wood chips is the third heating mode, the pressure is increased according to the relative difference between the surface temperature uniformity characterizing value and a preset surface temperature uniformity characterizing value.

[0094] In this embodiment, the reduction amplitude of the temperature rise gradient is positively correlated with the ratio between the surface temperature uniformity characterization value and the preset surface temperature uniformity characterization value, wherein the positive correlation is, for example, a linear positive correlation or a nonlinear positive correlation, and the linear slope of the linear positive correlation is not specifically limited. It can be understood that the greater the ratio between the surface temperature uniformity characterization value and the preset surface temperature uniformity characterization value, the greater the reduction amplitude of the temperature rise gradient.

[0095] In this embodiment, the reduction amplitude of the first preset heating time is positively correlated with the difference between the surface temperature uniformity characterization value and the preset surface temperature uniformity characterization value, wherein the positive correlation is, for example, a linear positive correlation or a nonlinear positive correlation, and the linear slope of the linear positive correlation is not specifically limited. It can be understood that the greater the difference between the surface temperature uniformity characterization value and the preset surface temperature uniformity characterization value, the greater the reduction amplitude of the first preset heating time.

[0096] Specifically, there are several pressure adjustment methods for the pressure increase, among which,

[0097] If the surface temperature uniformity difference is less than the first preset surface temperature uniformity difference of 0.15° C., the pressure is increased to the corresponding value using the first pressure adjustment coefficient of 1.02;

[0098] If the surface temperature uniformity difference is greater than or equal to the first preset surface temperature uniformity difference and less than the second preset surface temperature uniformity difference by 0.35° C., the pressure is increased to the corresponding value using a second pressure adjustment coefficient of 1.04;

[0099] If the surface temperature uniformity difference is greater than or equal to the second preset surface temperature uniformity difference, the pressure is increased to a corresponding value using a third pressure adjustment coefficient of 1.06;

[0100] The surface temperature uniformity characterization difference is a relative difference between the surface temperature uniformity characterization value and a preset surface temperature uniformity characterization value.

[0101] Specifically, the reason why the wood chips after heating and screening do not meet the preset standards is determined based on the thermal response characterization value of the wood chips, wherein:

[0102] If the thermal response characteristic value is less than the preset thermal response characteristic value by 2°C / min, it is determined that the reason why the wood chips after heat screening do not meet the preset standard is that there are residual mud and sand particles, and the wood chips are acid-washed;

[0103] If the thermal response characterization value is greater than or equal to a preset thermal response characterization value, it is determined that the reason why the wood chips after heat screening do not meet the preset standard is that there are residual metal particles. The wood chips are sorted by an eddy current separator and the speed of the eddy current separator is determined according to the difference between the thermal response characterization value and the preset thermal response characterization value.

[0104] Specifically, the thermal response characterization value is the average temperature rise rate of the surface temperature of the wood chips within the third preset heating time;

[0105] Obtaining a thermal image of the initial surface temperature of the wood chips using an infrared thermal imager and obtaining an average value of the initial surface temperature using graphics processing software;

[0106] Obtaining a thermal image of the surface temperature of the wood chips after being heated for a third preset heating time of 25 minutes using an infrared thermal imager and obtaining an average value of the surface temperature of the wood chips after being heated for the third preset heating time of 25 minutes using graphics processing software;

[0107] Obtaining a difference between an average value of the surface temperature of the wood chips after heating for a third preset heating time of 25 minutes and an average value of the initial surface temperature;

[0108] The value obtained by dividing the difference by the third preset heating time of 25 minutes is the average temperature rise rate, which is recorded as the thermal response characterization value.

[0109] Specifically, the third preset heating time is shorter than the first preset heating time and shorter than the second preset heating time.

[0110] Specifically, the rotation speed of the eddy current separator is determined according to the thermal response characteristic difference, wherein,

[0111] If the thermal response characteristic difference is less than a first preset thermal response characteristic difference of 0.7° C. / min, determining that the rotational speed of the eddy current separator is a first rotational speed;

[0112] If the thermal response characteristic difference is greater than or equal to the first preset thermal response characteristic difference and less than the second preset thermal response characteristic difference of 1.4° C. / min, determining that the rotational speed of the eddy current separator is the second rotational speed;

[0113] If the thermal response characteristic difference is greater than or equal to a second preset thermal response characteristic difference, determining that the rotational speed of the eddy current separator is a third rotational speed;

[0114] The thermal response characterization difference is the difference between the thermal response characterization value and the preset thermal response characterization value; the first speed is less than the second speed, the second speed is greater than the first speed and less than the third speed, and the third speed is greater than the second speed.

[0115] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

[0116] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for producing activated carbon from decoration waste, characterized in that: include: The renovation waste is crushed by a crusher, and then passed through a magnetic separator and an air separator to obtain wood chips, and the sound wave attenuation rate of the wood chips is obtained by an ultrasonic transmitter; Heating the wood chips, wherein a heating mode for the wood chips is determined according to an acoustic wave attenuation rate of the wood chips; The heated wood chips are screened by a vibrating screen and then measured using a four-probe conductivity meter to obtain the conductivity of the wood chips; When it is determined based on the electrical conductivity that the heated and screened wood chips do not meet the preset standard, obtaining the surface temperature of the wood chips, and obtaining a surface temperature uniformity characterization value of the wood chips and a thermal response characterization value of the wood chips; When it is determined that the heated and screened wood chips do not meet the preset standard based on the electrical conductivity, a second determination is made based on the surface temperature uniformity characterization value whether the heated and screened wood chips meet the preset standard, or a determination is made based on the thermal response characterization value of the wood chips why the heated and screened wood chips do not meet the preset standard; The heated and screened wood chips that meet preset standards are carbonized and activated in sequence to obtain activated carbon.

2. The method for producing activated carbon from decoration waste according to claim 1, characterized in that: The heating mode of the wood chips includes three heating modes, wherein: The first heating mode is to select a first preset temperature to heat the wood chips for a first preset heating time; The second heating mode is to heat the wood chips from the second preset temperature to a third preset temperature according to a preset temperature gradient; The third heating mode is to place the wood chips under the conditions of a fourth preset temperature and a preset pressure and heat them for a second preset heating time.

3. The method for producing activated carbon from decoration waste according to claim 2, characterized in that: The heating mode of the wood chips is determined according to the acoustic wave attenuation rate of the wood chips, wherein: If the sound wave attenuation rate is less than the first preset sound wave attenuation rate, determining to select the first heating mode; If the sound wave attenuation rate is greater than or equal to the first preset sound wave attenuation rate and less than the second preset sound wave attenuation rate, determining to select the second heating mode; If the sound wave attenuation rate is greater than or equal to the second preset sound wave attenuation rate, it is determined that the third heating mode is selected.

4. The method for producing activated carbon from decoration waste according to claim 3, characterized in that: The process of determining whether the heated and screened wood chips do not meet a preset standard based on the electrical conductivity of the wood chips includes: comparing the conductivity with a first preset conductivity and a second preset conductivity respectively; If the electrical conductivity is greater than or equal to the first preset electrical conductivity and less than the second preset electrical conductivity, it is determined that the wood chips after heating and screening do not meet the preset standard, and a second determination is made based on the surface temperature uniformity characteristic value whether the wood chips after heating and screening meet the preset standard; If the electrical conductivity is greater than or equal to a second preset electrical conductivity, it is determined that the heated and screened wood chips do not meet the preset standard, and the reason why the heated and screened wood chips do not meet the preset standard is determined based on the thermal response characterization value of the wood chips.

5. The method for producing activated carbon from decoration waste according to claim 4, characterized in that: A secondary determination is made based on the surface temperature uniformity characterization value whether the heated and screened wood chips meet the preset standard, wherein: If the surface temperature uniformity characterization value is less than a preset surface temperature uniformity characterization value, it is determined that the wood chips after heating and screening meet the preset standard; If the surface temperature uniformity characterization value is greater than or equal to a preset surface temperature uniformity characterization value, it is determined that the wood chips after heating and screening do not meet the preset standard, and the heating mode of the wood chips is optimized; The surface temperature uniformity characterization value is the standard deviation of the surface temperature of the wood chips.

6. The method for producing activated carbon from decoration waste according to claim 5, characterized in that: Under the condition that the wood chips after heating and screening are secondarily determined not to meet the preset standard according to the surface temperature uniformity characterization value, the process of optimizing the heating mode of the wood chips includes: Under the condition that the heating mode of the wood chips is the first heating mode, reducing the first preset heating time according to the difference between the surface temperature uniformity characterization value and the preset surface temperature uniformity characterization value; Under the condition that the heating mode of the wood chips is the second heating mode, reducing the temperature increase gradient according to the ratio between the surface temperature uniformity characterization value and a preset surface temperature uniformity characterization value; Under the condition that the heating mode of the wood chips is the third heating mode, the pressure is increased according to the relative difference between the surface temperature uniformity characterizing value and a preset surface temperature uniformity characterizing value.

7. The method for producing activated carbon from decoration waste according to claim 6, characterized in that: There are several pressure adjustment modes for increasing the pressure, and each pressure adjustment mode increases the pressure by a different amount.

8. The method for producing activated carbon from decoration waste according to claim 7, characterized in that: The reason why the heated and screened wood chips do not meet the preset standards is determined based on the thermal response characterization value of the wood chips, wherein: If the thermal response characterization value is less than a preset thermal response characterization value, it is determined that the reason why the wood chips after heat screening do not meet the preset standard is that there are residual mud and sand particles, and the wood chips are acid-washed; If the thermal response characterization value is greater than or equal to a preset thermal response characterization value, it is determined that the reason why the wood chips after heat screening do not meet the preset standard is that there are residual metal particles. The wood chips are sorted by an eddy current separator and the speed of the eddy current separator is determined according to the difference between the thermal response characterization value and the preset thermal response characterization value.

9. The method for producing activated carbon from decoration waste according to claim 8, characterized in that: The thermal response characterization value is an average temperature rise rate of the surface temperature of the wood chips within a third preset heating time.

10. The method for producing activated carbon from decoration waste according to claim 9, characterized in that: The rotation speed of the eddy current separator is determined according to the difference in thermal response characterization, wherein: If the thermal response characteristic difference is less than a first preset thermal response characteristic difference, determining that the rotational speed of the eddy current separator is a first rotational speed; If the thermal response characterization difference is greater than or equal to a first preset thermal response characterization difference and less than a second preset thermal response characterization difference, determining that the rotational speed of the eddy current separator is a second rotational speed; If the thermal response characteristic difference is greater than or equal to a second preset thermal response characteristic difference, determining that the rotational speed of the eddy current separator is a third rotational speed; The thermal response characterization difference is the difference between the thermal response characterization value and the preset thermal response characterization value; the first speed is less than the second speed, the second speed is greater than the first speed and less than the third speed, and the third speed is greater than the second speed.

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