A waste activated carbon regeneration system

Abstract

This application provides a waste activated carbon regeneration system, including: a tunnel kiln device, a kiln car transportation module, and a post-processing module; the tunnel kiln device is divided into a preheating zone, a roasting zone, a firing zone, and a cooling zone along its length; the preheating zone is configured to volatilize water vapor and first organic matter in the waste activated carbon to be regenerated; the roasting zone is configured to remove second organic matter from the waste activated carbon to be regenerated; the firing zone is configured to use oxidizing gas to perform a gasification reaction on carbides in the micropores of the waste activated carbon to be regenerated; the cooling zone is configured to cool the waste activated carbon to be regenerated to ambient temperature to obtain semi-finished activated carbon; the post-processing module is configured to condition the semi-finished activated carbon into finished regenerated activated carbon, thereby solving the problem that current waste activated carbon regeneration methods are difficult to process waste activated carbon with high organic matter content, and the adsorption performance of regenerated activated carbon often cannot be effectively restored, resulting in poor quality of regenerated activated carbon products.

Description

Technical Field

[0001] This application relates to the field of activated carbon regeneration technology, and more particularly to a waste activated carbon regeneration system. Background Technology

[0002] In my country, numerous industries, including power plants, water plants, industrial production, petrochemicals, food, and pharmaceuticals, generate an enormous amount of spent activated carbon annually during their production and operation, amounting to hundreds of millions of tons. As solid waste, spent activated carbon adsorbs a large amount of toxic and harmful substances. If it cannot be effectively utilized, the only option is landfill disposal. This method not only results in a huge waste of resources but also poses significant environmental risks.

[0003] To address the need for waste activated carbon treatment, the industry has adopted various regeneration methods, mainly including chemical elution, biological regeneration, wet oxidation, electrolytic oxidation, and thermal regeneration. Among these, thermal regeneration is the most widely used and relatively mature method in industry. Most existing thermal regeneration methods utilize vertical fluidized bed furnaces for regeneration, which places high demands on raw material quality and process parameter control.

[0004] While the aforementioned methods have achieved some degree of recycling of spent activated carbon, they still have many shortcomings. On the one hand, these processes have stringent requirements for the quality of the raw material, spent activated carbon, making it difficult to process spent activated carbon with high organic content. On the other hand, the adsorption performance of the activated carbon regenerated through these processes often cannot be effectively restored, resulting in poor quality regenerated products that fail to meet actual application needs. Furthermore, these processes require extremely high operational stability; if the spent activated carbon raw material is unstable or the process parameters deviate during regeneration, qualified products cannot be produced. Moreover, existing spent activated carbon regeneration processes generate waste gas and wastewater during operation, and these pollutants are difficult to treat, leading to high pollution control costs. Utility Model Content

[0005] This application provides a waste activated carbon regeneration system to solve the technical problems that existing waste activated carbon regeneration methods are difficult to process waste activated carbon with high organic content, and the adsorption performance of the regenerated activated carbon often cannot be effectively restored, resulting in poor quality of the regenerated activated carbon products.

[0006] This application provides a waste activated carbon regeneration system, comprising:

[0007] Tunnel kiln unit, kiln car transportation module, post-processing module;

[0008] The tunnel kiln device is divided into a preheating zone, a roasting zone, a firing zone, and a cooling zone along its length.

[0009] The discharge end of the preheating zone is connected to the feed end of the calcining zone. The preheating zone is configured to heat the waste activated carbon to be regenerated to a first preset temperature, so that the water vapor and the first organic matter in the waste activated carbon to be regenerated volatilize; the boiling point of the first organic matter is lower than the first preset temperature.

[0010] The discharge end of the roasting belt is connected to the feed end of the calcining belt. The roasting belt is configured to heat the waste activated carbon to be regenerated to a second preset temperature, so that the second organic matter in the waste activated carbon to be regenerated is eliminated from the waste activated carbon in the form of volatilization, decomposition, carbonization and oxidation. The second preset temperature is greater than the first preset temperature.

[0011] The discharge end of the calcining belt is connected to the feed end of the cooling belt. The calcining belt is configured to heat the waste activated carbon to be regenerated to a third preset temperature and use oxidizing gas to perform a gasification reaction on the carbides in the micropores of the waste activated carbon. The third preset temperature is greater than the second preset temperature. The oxidizing gas includes water vapor and carbon dioxide.

[0012] The cooling zone is configured to use a cold air blower to cool the waste activated carbon to be regenerated, thereby cooling the waste activated carbon to be regenerated to the ambient temperature and obtaining semi-finished activated carbon.

[0013] The kiln car transport module is configured to transport the roasting tank containing the waste activated carbon to be regenerated from the feed end of the preheating zone to the preheating zone, roasting zone, firing zone, cooling zone, and post-processing module in sequence.

[0014] The post-processing module is connected to the discharge end of the cooling belt, and the post-processing module is configured to condition the semi-finished activated carbon into a finished regenerated activated carbon product.

[0015] In some embodiments, the system further includes:

[0016] An exhaust gas treatment module is connected to the tunnel kiln device;

[0017] The exhaust gas treatment module includes a secondary combustion chamber, an air preheater, an SNCR denitrification unit, a quench tower, a bag filter, an activated carbon adsorption tower, an alkaline spray device, and an exhaust stack connected in sequence.

[0018] The secondary combustion chamber is configured to ensure that the process exhaust gas generated by the tunnel kiln device is fully combusted under the action of natural gas and a high-pressure blower; the temperature inside the secondary combustion chamber is higher than the third preset temperature.

[0019] The air preheater is configured to exchange heat between the flue gas and the cold air drawn in by the high-pressure blower after the process exhaust gas has been completely burned, and then discharge the heat-exchanged cold air into the tunnel kiln device.

[0020] The SNCR denitrification unit is configured to denitrify the process exhaust gas.

[0021] The quench tower is configured to cool the process exhaust gas. After the process exhaust gas is cooled to a fourth preset temperature, it is discharged into the bag filter, activated carbon adsorption tower, and alkaline spray device for filtering dust, organic waste gas, and acidic gas, respectively, to obtain purified flue gas.

[0022] The exhaust stack is configured to discharge the purified flue gas.

[0023] In some embodiments, the kiln car transport module includes: a kiln car, a track, and a drive unit;

[0024] The kiln car is connected to the track and is configured to hold a roasting tank containing the waste activated carbon to be regenerated.

[0025] The track is set inside the tunnel kiln device and the post-processing module, as well as on the connecting channel between the tunnel kiln device and the post-processing module;

[0026] The drive unit is connected to the kiln car and is configured to drive the kiln car along the track to enter the tunnel kiln device and the post-processing module.

[0027] The drive unit is also configured to control the running speed and dwell time of the kiln car.

[0028] In some embodiments, the preheating zone is provided with a temperature sensor, a heating element, and a controller that are connected in communication.

[0029] The temperature sensor is configured to acquire a first temperature value within the preheating zone;

[0030] The controller is configured to compare the temperature value with the preset value; if the temperature value is less than the preset value, the controller controls the heating element to increase its operating power; if the temperature value is greater than the preset value, the controller controls the heating element to decrease its operating power or controls the heating element to stop operating.

[0031] In some embodiments, the calcination zone is provided with a burner, a fuel supply pipe, an air supply pipe, and a temperature control controller;

[0032] The burner is configured to heat the granulated activated carbon; the granulated activated carbon is used to heat the waste activated carbon to be regenerated.

[0033] The fuel supply conduit is connected to the burner and is configured to supply fuel to the burner.

[0034] The air supply duct is connected to the burner and is configured to supply combustion air to the burner.

[0035] The temperature control controller is connected to the fuel supply pipe and the air supply pipe. The temperature control controller is configured to adjust the fuel flow rate of the fuel supply pipe and the air flow rate of the air supply pipe according to the second temperature value in the roasting zone, so that the temperature of the granulated char reaches the second preset temperature.

[0036] In some embodiments, the firing zone is equipped with a natural gas supply device, an oxidizing gas supply device, and a temperature monitoring and control unit;

[0037] The natural gas supply device is configured to supply natural gas to the firing zone and ignite it;

[0038] The oxidizing gas supply device is configured to supply oxidizing gas to the firing zone;

[0039] The temperature monitoring and control unit is configured to acquire a third temperature value within the firing zone and, based on the third temperature value, adjust the supply of natural gas and oxidizing gas to maintain the third temperature value at the third preset temperature.

[0040] In some embodiments, the air cooler in the cooling zone is equipped with an air volume sensor, a regulating valve, and an air volume controller;

[0041] The air volume sensor is configured to acquire the air volume blown out by the air cooler;

[0042] The regulating valve is installed on the air outlet duct of the air cooler;

[0043] The air volume controller is configured to compare the air volume with a preset air volume. If the air volume is lower than the preset air volume, the controller controls the regulating valve to increase its opening. If the air volume is higher than the preset air volume, the controller controls the regulating valve to decrease its opening, thereby cooling the waste activated carbon to be regenerated to ambient temperature.

[0044] In some embodiments, the quench tower includes:

[0045] The first tower body; several water spray devices are installed inside the first tower body;

[0046] An airflow distribution device is installed inside the first tower body and located below the water spray device; the airflow distribution device is equipped with several miniature fans.

[0047] In some embodiments, the bag filter includes:

[0048] A dust collector housing; the dust collector housing is provided with a first air inlet and a first air outlet; the first air inlet is located at the top of the dust collector housing, and the first air outlet is located at the bottom of the dust collector housing;

[0049] A bag filter assembly is disposed inside the dust collector housing. The bag filter assembly consists of a plurality of filter bags and is configured to filter dust in the process exhaust gas.

[0050] The process exhaust gas enters the dust collector housing through the first air inlet, and after the dust in the process exhaust gas is filtered by the bag filter assembly, it is discharged into the activated carbon adsorption tower through the first air outlet.

[0051] In some embodiments, the activated carbon adsorption tower includes:

[0052] The second tower body is provided with a second air inlet and a second air outlet; the second air inlet is located at the bottom of the second tower body, and the second air outlet is located at the top of the second tower body.

[0053] An activated carbon packing layer is disposed in the second tower body. The activated carbon packing layer is composed of several layers of activated carbon and is configured to adsorb organic waste gas in the process tail gas.

[0054] The process exhaust gas enters the second tower body through the second air inlet, and after the organic waste gas in the process exhaust gas is adsorbed by the activated carbon filling layer, it is discharged into the alkaline spray device through the second air outlet.

[0055] This application provides a waste activated carbon regeneration system, including: a tunnel kiln device, a kiln car transportation module, and a post-processing module; the tunnel kiln device is divided into a preheating zone, a roasting zone, a firing zone, and a cooling zone along its length; the discharge end of the preheating zone is connected to the feed end of the roasting zone, and the preheating zone is configured to heat the waste activated carbon to be regenerated to a first preset temperature, causing water vapor and a first organic compound in the waste activated carbon to volatilize; the boiling point of the first organic compound is lower than the first preset temperature; the discharge end of the roasting zone is connected to the feed end of the firing zone, and the roasting zone is configured to heat the waste activated carbon to be regenerated to a second preset temperature, causing a second organic compound in the waste activated carbon to be eliminated from the waste activated carbon in the form of volatilization, decomposition, carbonization, and oxidation; the second preset temperature is higher than the first preset temperature; the discharge end of the firing zone is connected to the feed end of the cooling zone, and the firing zone is configured to heat the waste activated carbon to be regenerated to a second preset temperature, causing a second organic compound in the waste activated carbon to be eliminated from the waste activated carbon in the form of volatilization, decomposition, carbonization, and oxidation; the second preset temperature is higher than the first preset temperature; the discharge end of the firing zone is connected to the feed end of the cooling zone, and the firing zone is configured to heat the waste activated carbon to be regenerated to a second preset temperature. The activated carbon is heated to a third preset temperature, and an oxidizing gas is used to gasify the carbides in the micropores of the waste activated carbon to be regenerated. The third preset temperature is higher than the second preset temperature. The oxidizing gas includes water vapor and carbon dioxide. The cooling zone is configured to use a cold air blower to cool the waste activated carbon to be regenerated to ambient temperature, thus obtaining semi-finished activated carbon. The kiln car transport module is configured to transport the calcining tank containing the waste activated carbon to be regenerated sequentially from the feed end of the preheating zone to the preheating zone, calcining zone, firing zone, cooling zone, and post-processing module. The post-processing module is connected to the discharge end of the cooling zone and is configured to condition the semi-finished activated carbon into regenerated activated carbon, so as to realize that the waste activated carbon regeneration system can process waste activated carbon with high organic content. Moreover, the adsorption capacity of the regenerated activated carbon can be restored to the greatest extent after treatment, thereby improving the quality of the regenerated activated carbon product. Attached Figure Description

[0056] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0057] Figure 1 This is a schematic diagram of the operation of the waste activated carbon regeneration system in this application;

[0058] Figure 2 This is a schematic diagram of the tunnel kiln device in this application;

[0059] Figure 3 This is a schematic diagram of the preheating zone structure in this application;

[0060] Figure 4This is a schematic diagram of the roasting zone structure in this application;

[0061] Figure 5 This is a schematic diagram of the sintering zone structure in this application;

[0062] Figure 6 This is a schematic diagram of the structure of the air cooler in this application;

[0063] Figure 7 This is a schematic diagram of the kiln car transportation module in this application;

[0064] Figure 8 This is a schematic diagram of the exhaust gas treatment module in this application;

[0065] Figure 9 This is a schematic diagram of the quench tower in this application;

[0066] Figure 10 This is a schematic diagram of the airflow distribution device in this application;

[0067] Figure 11 This is a schematic diagram of the structure of the bag filter in this application;

[0068] Figure 12 This is a schematic diagram of the activated carbon adsorption tower in this application.

[0069] Explanation of reference numerals in the attached figures:

[0070] 1-Tunnel kiln unit; 11-Preheating zone; 111-Temperature sensor; 112-Heating element; 113-Controller; 12-Roasting zone; 121-Burner; 122-Fuel supply pipeline; 123-Air supply pipeline; 124-Temperature control controller; 13-Firing zone; 131-Natural gas supply device; 132-Oxidizing gas supply device; 133-Temperature monitoring and control unit; 14-Cooling zone; 141-Air cooler; 1411-Air volume sensor; 1412-Regulating valve; 1413-Air volume controller; 2-Kiln car transport module; 21-Kiln car; 22-Railway; 23-Drive device; 3-Post-processing 4-Treatment module; 4-Exhaust gas treatment module; 41-Secondary combustion chamber; 42-Air preheater; 43-SNCR denitrification unit; 44-Quick cooling tower; 441-First tower body; 442-Water spray device; 443-Airflow distribution device; 4431-Miniature fan; 45-Bag dust collector; 451-Dust collector housing; 4511-First air inlet; 4512-First air outlet; 452-Bag filter assembly; 4521-Bag; 46-Activated carbon adsorption tower; 461-Second tower body; 4611-Second air inlet; 4612-Second air outlet; 462-Activated carbon filling layer; 47-Alkali spray device; 48-Exhaust stack. Detailed Implementation

[0071] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0072] Because some technologies struggle to process activated carbon with high organic content, and the adsorption performance of regenerated activated carbon often fails to be effectively restored, resulting in poor quality of regenerated activated carbon products, this application provides a waste activated carbon regeneration system to address this technical problem. The structure of each part of the waste activated carbon regeneration system is described below:

[0073] like Figure 1 The diagram shown is a schematic of the operation of the waste activated carbon regeneration system in this application.

[0074] This application provides a waste activated carbon regeneration system, comprising:

[0075] Tunnel kiln unit 1, kiln car transportation module 2, post-processing module 3.

[0076] The tunnel kiln device 1 is divided along its length into a preheating zone 11, a roasting zone 12, a firing zone 13, and a cooling zone 14, as follows: Figure 2 As shown.

[0077] The discharge end of the preheating zone 11 is connected to the feed end of the roasting zone 12. The preheating zone 11 is configured to heat the waste activated carbon to be regenerated to a first preset temperature, so that the water vapor and the first organic matter in the waste activated carbon to be regenerated volatilize. The boiling point of the first organic matter is lower than the first preset temperature. The preheating zone 11 is used to heat the waste activated carbon to be regenerated with a moisture content of 40%-60% to about 200°C, so that the waste activated carbon to be regenerated adsorbs water vapor and some low-boiling-point organic matter volatilizes, that is, organic matter with a boiling point lower than 200°C.

[0078] The discharge end of the roasting belt 12 is connected to the feed end of the calcining belt 13. The roasting belt 12 is configured to heat the waste activated carbon to be regenerated to a second preset temperature, so that the second organic matter in the waste activated carbon to be regenerated is eliminated from the waste activated carbon in the form of volatilization, decomposition, carbonization, and oxidation. The second preset temperature is greater than the first preset temperature. The roasting belt 12 is used to heat the waste activated carbon to be regenerated to 600-700℃, so that different organic matter is eliminated from the activated carbon matrix in the form of volatilization, decomposition, carbonization, and oxidation.

[0079] The discharge end of the calcining belt 13 is connected to the feed end of the cooling belt 14. The calcining belt 13 is configured to heat the waste activated carbon to be regenerated to a third preset temperature and use oxidizing gases to perform a gasification reaction on the carbides in the micropores of the waste activated carbon to be regenerated. The third preset temperature is higher than the second preset temperature. The oxidizing gases include water vapor and carbon dioxide. The calcining belt 13 is used at around 850°C to use oxidizing gases such as water vapor and carbon dioxide to perform a gasification reaction on some of the carbides remaining in the micropores of the waste activated carbon to be regenerated, so as to clean the surface of the micropores and restore the adsorption performance.

[0080] The cooling belt 14 is configured to use a cold air blower 141 to cool the waste activated carbon to be regenerated, thereby cooling the waste activated carbon to be regenerated to the ambient temperature and obtaining semi-finished activated carbon; the cooling belt 14 uses a cold air blower to cool the waste activated carbon to be regenerated, thereby gradually cooling it down and obtaining semi-finished activated carbon.

[0081] The kiln car transport module 2 is configured to transport the roasting tank containing the waste activated carbon to be regenerated from the feed end of the preheating zone 11 to the preheating zone 11, roasting zone 12, firing zone 13, cooling zone 14, and post-processing module 3 in sequence.

[0082] The post-processing module 3 is connected to the discharge end of the cooling belt 14. The post-processing module 3 is configured to condition the semi-finished activated carbon into recycled activated carbon. The post-processing module 3 includes a semi-finished product packaging workshop and a ball milling workshop. The semi-finished product packaging workshop is used to manually pour the activated carbon, which has been completely cooled and contains semi-finished activated carbon, into ton bags. The ball milling workshop is used to condition the semi-finished activated carbon poured into the ton bags, and after conditioning, it is packaged and stored to obtain recycled activated carbon.

[0083] This application provides a waste activated carbon regeneration system that solves the problems existing in the current waste activated carbon regeneration technology. It adopts continuous tunnel kiln high-temperature treatment as the main regeneration process. It does not have high requirements for the quality of waste activated carbon and can process waste activated carbon generated by most industries. The regeneration process is intermittent production, and the operating conditions are easy to control. It will not cause equipment downtime due to unstable raw materials or difficult operating conditions. The regenerated activated carbon has an adsorption performance restored to more than 90%, and the product has good performance and high quality.

[0084] like Figure 8 The diagram shown is a structural schematic of the exhaust gas treatment module 4 in this application.

[0085] In this embodiment, the system further includes:

[0086] The exhaust gas treatment module 4 is connected to the tunnel kiln device 1. The exhaust gas treatment module 4 includes a secondary combustion chamber 41, an air preheater 42, an SNCR denitrification unit 43, a quench tower 44, a bag filter 45, an activated carbon adsorption tower 46, an alkali spray device 47, and an exhaust stack 48, which are connected in sequence.

[0087] The secondary combustion chamber 41 is configured to ensure the complete combustion of the process exhaust gas generated by the tunnel kiln unit 1 under the action of natural gas and a high-pressure blower. The temperature inside the secondary combustion chamber 41 is higher than the third preset temperature. The secondary combustion chamber 41 is equipped with a combustion auxiliary device, which includes a high-pressure air injection device and an ignition device. The high-pressure air injection device is used to inject high-pressure air into the secondary combustion chamber 41 to enhance the turbulence of the exhaust gas and promote its complete combustion. The ignition device is used to ignite the exhaust gas in the initial stage of entering the secondary combustion chamber 41 to ensure that the exhaust gas can be burned quickly. At the same time, the secondary combustion chamber is also equipped with a temperature monitoring device to monitor the temperature inside the secondary combustion chamber 41 in real time and feed the temperature signal back to the control system so as to adjust the air injection volume of the high-pressure air injection device and the working status of the ignition device in a timely manner, ensuring that the temperature inside the secondary combustion chamber 41 is ≥850℃ and that the residence time above 1100℃ is more than 2 seconds, so as to ensure the complete combustion of the process exhaust gas.

[0088] The air preheater 42 is configured to exchange heat between the flue gas and the cold air drawn in by the high-pressure blower after the process tail gas has been completely burned, and then discharge the heat-exchanged cold air into the tunnel kiln device 1; the SNCR denitrification unit 43 is configured to denitrify the process tail gas; the quench tower 44 is configured to cool the process tail gas, and after the process tail gas is cooled to a fourth preset temperature, it is discharged into the bag filter 45, activated carbon adsorption tower 46, and alkaline spray device 47 for filtering dust, organic waste gas, and acidic gas respectively, to obtain purified flue gas; the exhaust stack 48 is configured to discharge the purified flue gas. In this embodiment, by setting the tail gas treatment module 4, the waste activated carbon regeneration process does not generate wastewater, and the waste gas is stably discharged in compliance with standards after high-temperature incineration, denitrification, dust removal, and deacidification treatment, and the regeneration process does not cause secondary pollution.

[0089] like Figure 7 The diagram shown is a structural schematic of the kiln car transportation module 2 in this application.

[0090] In this embodiment, the kiln car transport module 2 includes: a kiln car 21, a track 22, and a drive device 23; the kiln car 21 is connected to the track 22, and the kiln car 21 is configured to place the roasting tank containing the waste activated carbon to be regenerated; the track 22 is disposed within the tunnel kiln device 1 and the post-processing module 3, and on the connecting channel between the tunnel kiln device 1 and the post-processing module 3; the drive device 23 is connected to the kiln car 21, and the drive device 23 is configured to drive the kiln car 21 to enter the tunnel kiln device 1 and the post-processing module 3 along the track 22.

[0091] The drive unit 23 is also configured to control the running speed and dwell time of the kiln car 21.

[0092] Specifically, the kiln car transport module 2 includes a kiln car 21, a track 22, and a drive unit 23. The kiln car 21 is used to place the roasting tank containing waste activated carbon. The track 22 is laid in various areas of the tunnel kiln device and on the connecting channels to provide a running path for the kiln car 21. The drive unit 23 is connected to the kiln car 21 and is used to drive the kiln car 21 along the track 22 to enter the preheating zone 11, the roasting zone 12, the firing zone 13, and the cooling zone 14 in sequence. It can also control the running speed and dwell time of the kiln car 21 to meet the time requirements for waste activated carbon treatment at different stages.

[0093] like Figure 3 The diagram shown is a schematic diagram of the preheating zone 11 in this application.

[0094] In this embodiment, the preheating zone 11 is equipped with a temperature sensor 111, a heating element 112, and a controller 113 connected in communication. The temperature sensor 111 is configured to acquire a first temperature value within the preheating zone 11. The controller 113 is configured to compare the temperature value with a preset value. If the temperature value is less than the preset value, the controller controls the heating element 112 to increase its operating power. If the temperature value is greater than the preset value, the controller controls the heating element 112 to decrease its operating power or stops operating.

[0095] Specifically, the preheating zone 11 is equipped with a temperature control device, which includes a temperature sensor 111, a heating element 112, and a controller 113. The temperature sensor 111 is used to monitor the temperature of the preheating zone 11 in real time and transmit the temperature signal to the controller 113. The heating element 112 is used to heat the preheating zone 11. The controller 113 compares the received temperature signal with a preset temperature value of approximately 200°C. When the temperature is lower than the preset value, the controller controls the heating element 112 to increase the heating power. When the temperature is higher than the preset value, the controller controls the heating element 112 to reduce the heating power or stop heating, thereby ensuring that the temperature of the preheating zone 11 is stable at approximately 200°C.

[0096] like Figure 4 The diagram shown is a schematic diagram of the structure of the roasting zone 12 in this application.

[0097] In this embodiment, the calcination zone 12 is provided with a burner 121, a fuel supply pipe 122, an air supply pipe 123, and a temperature control controller 124; the burner 121 is configured to heat the granulated char; the granulated char is used to heat the waste activated carbon to be regenerated; the fuel supply pipe 122 is connected to the burner 121 and is configured to supply fuel to the burner 121; the air supply pipe 123 is connected to the burner 121 and is configured to provide combustion air to the burner 121.

[0098] The temperature control controller 124 is connected to the fuel supply pipe 122 and the air supply pipe 123. The temperature control controller 124 is configured to adjust the fuel flow rate of the fuel supply pipe 122 and the air flow rate of the air supply pipe 123 according to the second temperature value in the roasting zone 12, so that the temperature of the granulated char reaches the second preset temperature.

[0099] Specifically, the roasting zone 12 is equipped with a temperature regulation mechanism, which includes a burner 121, a fuel supply pipe 122, an air supply pipe 123, and a temperature regulation controller 124. The burner 121 is used to generate a high-temperature flame in the roasting zone 12 to heat the granulated carbon. The fuel supply pipe 122 is used to supply fuel to the burner 121. The air supply pipe 123 is used to supply combustion air to the burner 121. The temperature regulation controller 124 controls the combustion intensity of the burner 121 by adjusting the fuel flow rate of the fuel supply pipe 122 and the air flow rate of the air supply pipe 123 according to a preset temperature range of 600-700℃, thereby regulating the temperature of the roasting zone 12 so that the granulated carbon can be heated to 600-700℃ as required, thus heating the waste activated carbon to be regenerated.

[0100] like Figure 5 The diagram shown is a schematic diagram of the structure of the firing zone 13 in this application.

[0101] In this embodiment, the firing zone 13 is equipped with a natural gas supply device 131, an oxidizing gas supply device 132, and a temperature monitoring and control unit 133; the natural gas supply device 131 is configured to supply natural gas to the firing zone 13 and ignite it; the oxidizing gas supply device 132 is configured to supply oxidizing gas to the firing zone 13; the temperature monitoring and control unit 133 is configured to acquire a third temperature value within the firing zone 13, and adjust the supply of natural gas and oxidizing gas according to the third temperature value, so that the third temperature value is maintained at the third preset temperature.

[0102] Specifically, the firing zone 13 is equipped with a natural gas supply device 131, an oxidizing gas supply device 132, and a temperature monitoring and control unit 133. The natural gas supply device 131 is used to supply natural gas to the firing zone 13 and ignite it to provide heat for the gasification reaction. The oxidizing gas supply device 132 is used to supply oxidizing gases such as water vapor and carbon dioxide to the firing zone 13. The temperature monitoring and control unit 133 includes a temperature sensor and a controller. The temperature sensor monitors the temperature of the firing zone 13 in real time and transmits the signal to the controller. The controller adjusts the supply of natural gas and oxidizing gas according to a preset temperature value of about 850°C to ensure that the gasification reaction is carried out under suitable temperature conditions, so that the residual carbides are fully gasified into gases such as CO2 and CO.

[0103] like Figure 6 The diagram shown is a structural schematic of the air cooler 141 in this application.

[0104] In this embodiment, the air cooler 141 within the cooling zone 14 is equipped with an airflow sensor 1411, a regulating valve 1412, and an airflow controller 1413. The airflow sensor 1411 is configured to acquire the airflow volume emitted by the air cooler 141. The regulating valve 1412 is located on the air outlet duct of the air cooler 141. The airflow controller 1413 is configured to compare the airflow volume with a preset airflow volume. If the airflow volume is lower than the preset airflow volume, the regulating valve 1412 is controlled to increase its opening. If the airflow volume is higher than the preset airflow volume, the regulating valve 1412 is controlled to decrease its opening, thereby cooling the waste activated carbon to be regenerated to ambient temperature.

[0105] Specifically, the air cooler 141 of the cooling belt 14 is equipped with an airflow regulating device, which includes an airflow sensor 1411, a regulating valve 1412, and an airflow controller 1413. The airflow sensor 1411 is used to monitor the airflow from the air cooler 141 in real time and transmit the airflow signal to the airflow controller 1413. The regulating valve 1412 is installed on the air outlet duct of the air cooler 141. The airflow controller 1413 compares the received airflow signal with a preset suitable airflow value. When the airflow is lower than the preset value, it controls the regulating valve 1412 to increase its opening. When the airflow is higher than the preset value, it controls the regulating valve 1412 to decrease its opening, thereby ensuring that the cooling belt 14 can cool the waste activated carbon to be regenerated with a suitable airflow, so that the waste activated carbon to be regenerated is cooled evenly.

[0106] like Figure 9 The diagram shown is a structural schematic of the quench tower 44 in this application.

[0107] In this embodiment, the quench tower 44 includes:

[0108] A first tower body 441; a plurality of water spray devices 442 are provided inside the first tower body 441; an airflow distribution device 443 is provided inside the first tower body 441, and the airflow distribution device 443 is located below the water spray devices 442; the airflow distribution device 443 is provided with a plurality of miniature fans 4431, such as Figure 10 As shown.

[0109] Specifically, the quench tower 44 includes a first tower body 441, a water spray device 442, and an airflow distribution device 443. The first tower body 441 provides cooling space for the process exhaust gas. The water spray device 442 is installed at the top inside the quench tower 44 and can evenly spray water mist into the quench tower 44 to fully contact the process exhaust gas entering the quench tower 44 and achieve rapid cooling. The airflow distribution device 443 is located at the bottom inside the quench tower 44 to evenly distribute the flue gas entering the quench tower 44, enhance the water and air turbulence effect, and further improve dust removal and quenching efficiency. At the same time, the quench tower 44 is also equipped with a water level monitoring device and a temperature monitoring device to monitor the water level inside the tower and the temperature of the flue gas after cooling, respectively, to ensure the normal operation of the quench tower.

[0110] like Figure 11 The diagram shown is a structural schematic of the bag filter 45 in this application.

[0111] In this embodiment, the bag filter 45 includes:

[0112] The dust collector housing 451 is provided with a first air inlet 4511 and a first air outlet 4512. The first air inlet 4511 is located at the top of the dust collector housing 451, and the first air outlet 4512 is located at the bottom of the dust collector housing 451.

[0113] A bag filter assembly 452 is disposed inside the dust collector housing 451. The bag filter assembly 452 is composed of a plurality of filter bags 4521 and is configured to filter dust in the process exhaust gas.

[0114] The process exhaust gas enters the dust collector housing 451 through the first air inlet 4511, and after the dust in the process exhaust gas is filtered by the bag filter assembly 452, it is discharged into the activated carbon adsorption tower 46 through the first air outlet 4512.

[0115] Specifically, the bag filter 45 includes a dust collector housing 451 and a bag filter assembly 452. The dust collector housing 451 provides filtration space for process exhaust gas. The bag filter assembly 452 is installed inside the dust collector housing 451 and consists of multiple bags for filtering dust in the flue gas. The first air inlet 4511 is located at the top of the dust collector housing 451, and the first air outlet 4512 is located at the bottom of the dust collector housing 451. By compressing the process exhaust gas to the first air outlet 4512, the dust in the process exhaust gas is better filtered.

[0116] like Figure 12 The diagram shown is a schematic diagram of the activated carbon adsorption tower 46 in this application.

[0117] In this embodiment, the activated carbon adsorption tower 46 includes:

[0118] The second tower body 461 is provided with a second air inlet 4611 and a second air outlet 4612; the second air inlet 4611 is located at the bottom of the second tower body 461, and the second air outlet 4612 is located at the top of the second tower body 461.

[0119] An activated carbon filling layer 462 is disposed inside the second tower body 461. The activated carbon filling layer 462 is composed of several layers of activated carbon and is configured to adsorb organic waste gas in the process tail gas.

[0120] The process exhaust gas enters the second tower body 461 through the second air inlet 4611, and after the organic waste gas in the process exhaust gas is adsorbed by the activated carbon filling layer 462, it is discharged into the alkaline spray device 47 through the second air outlet 4612.

[0121] Specifically, the activated carbon adsorption tower 46 includes a second tower body 461 and an activated carbon filling layer 462; the second tower body 461 provides adsorption space for process tail gas; the activated carbon filling layer 462 fills the interior of the activated carbon adsorption tower 46 and is composed of multiple layers of activated carbon, used to adsorb organic waste gas in the process tail gas; wherein, the activated carbon adsorption tower 46 is also equipped with an activated carbon replacement device, which facilitates the periodic replacement of ineffective activated carbon and ensures the adsorption performance of the adsorption tower.

[0122] This application provides a waste activated carbon regeneration system, the process flow of which is as follows:

[0123] First, the waste activated carbon is loaded into a roasting tank and transported to tunnel kiln unit 1 of the waste activated carbon regeneration workshop by kiln car 21. Roasting mainly takes place in the middle of the kiln. After entering tunnel kiln unit 1, kiln car 21 first undergoes a drying stage (preheating zone 11) with the temperature controlled at around 200℃. The wet carbon with a moisture content of 40%-60% is heated, causing the waste activated carbon to adsorb water vapor, while some low-boiling-point organic matter also volatilizes. Then, as kiln car 21 advances into the middle of the kiln, the roasting stage begins, where the waste activated carbon to be regenerated is heated to 600-700℃. As the temperature rises, different organic substances are eliminated from the activated carbon matrix in the form of volatilization, decomposition, carbonization, and oxidation, respectively. After the roasting stage, the waste activated carbon to be regenerated enters the natural gas ignition section (firing zone 13) in the middle of the kiln for activation. During this process, some of the carbides remaining in the micropores of the waste activated carbon undergo a gasification reaction with oxidizing gases such as water vapor and carbon dioxide, causing the residual carbides to gasify into gases such as CO2 and CO at around 850℃. This cleans the surface of the micropores and restores their adsorption performance. Finally, the kiln car 21 enters the cooling section (cooling zone 14) of the kiln. In the cooling section, the waste activated carbon to be regenerated in the refractory container is cooled by blowing air from the cold air blower 141, gradually reducing its temperature to obtain semi-finished activated carbon. This semi-finished activated carbon is then gradually transported to the kiln outlet in sequence, awaiting discharge. The entire roasting process takes approximately 30 hours. After complete cooling, the roasting tank containing the semi-finished activated carbon is transported to the existing semi-finished product packaging workshop, manually poured into ton bags, and then transported to the existing ball mill workshop for conditioning, followed by packaging and warehousing to obtain the finished regenerated activated carbon.

[0124] The main process for treating the process exhaust gas is "SNCR denitrification + quench tower + bag filter + activated carbon adsorption + alkaline spray". The tunnel kiln process exhaust gas is fully combusted under the action of natural gas combustion and high-pressure air injection. After combustion, the flue gas enters the secondary combustion chamber 41 for re-combustion. Under normal circumstances, the temperature in the secondary combustion chamber should be ≥850℃, and it is designed to have a residence time of more than 2 seconds above 1100℃. After complete combustion, the flue gas enters the air preheater 42, where a high-pressure blower draws in cold air, which is then exchanged with the flue gas before entering the furnace, increasing the furnace temperature and reducing fuel consumption. It then enters the SNCR denitrification unit 43 for denitrification. Considering the low-temperature (300-500℃ temperature range) regeneration of dioxins, the initially cooled flue gas enters the quench tower 44 for rapid cooling, where it is further dusted and rapidly cooled by water and air turbulence. After cooling, the flue gas enters the bag filter 45, activated carbon adsorption tower 46, and alkaline spray device 47 to further remove dust, organic waste gas, and acidic gases from the flue gas. The purified flue gas is then drawn by an induced draft fan to the exhaust stack 48 for discharge.

[0125] This application provides a waste activated carbon regeneration system, which has the following advantages:

[0126] 1. Continuous tunnel kiln high-temperature treatment is the main regeneration process. It does not have high requirements for the quality of waste activated carbon entering the kiln and can process waste activated carbon generated by most industries.

[0127] 2. The regeneration process is an intermittent production process, and the operating conditions are easy to control. The equipment will not be shut down due to unstable raw materials or difficult-to-control operating conditions.

[0128] 3. The regenerated activated carbon has an adsorption performance recovery rate of over 90%, resulting in a product with good performance and high quality.

[0129] 4. The regeneration process does not produce wastewater. After high-temperature incineration, denitrification, dust removal, and acid removal, the exhaust gas is discharged in a stable manner that meets emission standards. The regeneration process will not cause secondary pollution.

[0130] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A spent activated carbon regeneration system, characterized by, include: Tunnel kiln unit (1), kiln car transportation module (2), post-processing module (3); The tunnel kiln device (1) is divided into a preheating zone (11), a roasting zone (12), a firing zone (13), and a cooling zone (14) along its length. The discharge end of the preheating zone (11) is connected to the feed end of the roasting zone (12). The preheating zone (11) is configured to heat the waste activated carbon to be regenerated to a first preset temperature, so that the water vapor and the first organic matter in the waste activated carbon to be regenerated volatilize; the boiling point of the first organic matter is lower than the first preset temperature. The discharge end of the roasting belt (12) is connected to the feed end of the calcining belt (13). The roasting belt (12) is configured to heat the waste activated carbon to be regenerated to a second preset temperature, so that the second organic matter in the waste activated carbon to be regenerated is eliminated from the waste activated carbon in the form of volatilization, decomposition, carbonization and oxidation. The second preset temperature is greater than the first preset temperature; The discharge end of the calcining belt (13) is connected to the feed end of the cooling belt (14). The calcining belt (13) is configured to heat the waste activated carbon to be regenerated to a third preset temperature and use oxidizing gas to perform a gasification reaction on the carbides in the micropores of the waste activated carbon to be regenerated. The third preset temperature is greater than the second preset temperature; the oxidizing gas includes: water vapor and carbon dioxide; The cooling belt (14) is configured to use a cold air blower (141) to blow air and cool the waste activated carbon to be regenerated, so that the waste activated carbon to be regenerated is cooled to the ambient temperature, and a semi-finished activated carbon is obtained. The kiln car transport module (2) is configured to transport the calcining tank containing the waste activated carbon to be regenerated from the feed end of the preheating zone (11) to the preheating zone (11), calcining zone (12), firing zone (13), cooling zone (14), and post-processing module (3) in sequence. The post-processing module (3) is connected to the discharge end of the cooling belt (14), and the post-processing module (3) is configured to condition the semi-finished activated carbon into a regenerated activated carbon product.

2. The waste activated carbon regeneration system according to claim 1, characterized in that, The system also includes: The exhaust gas treatment module (4) is connected to the tunnel kiln device (1); The exhaust gas treatment module (4) includes a secondary combustion chamber (41), an air preheater (42), an SNCR denitrification unit (43), a quench tower (44), a bag filter (45), an activated carbon adsorption tower (46), an alkali spraying device (47), and an exhaust stack (48) connected in sequence. The secondary combustion chamber (41) is configured to allow the process tail gas generated by the tunnel kiln device (1) to be fully combusted under the action of natural gas and a high-pressure blower; the temperature inside the secondary combustion chamber (41) is greater than the third preset temperature; The air preheater (42) is configured to exchange heat with the cold air drawn in by the high-pressure blower using flue gas after the process tail gas has been completely burned, and to discharge the cold air after heat exchange into the tunnel kiln device (1). The SNCR denitrification unit (43) is configured to denitrify the process exhaust gas; The quench tower (44) is configured to cool down the process tail gas. After the process tail gas is cooled to the fourth preset temperature, it is discharged into the bag filter (45), activated carbon adsorption tower (46), and alkali spray device (47) to filter dust, organic waste gas and acidic gas respectively, and obtain purified flue gas. The exhaust stack (48) is configured to discharge the purified flue gas.

3. The waste activated carbon regeneration system according to claim 1, characterized in that, The kiln car transport module (2) includes: a kiln car (21), a track (22), and a drive device (23); The kiln car (21) is connected to the track (22), and the kiln car (21) is configured to place the roasting tank containing the waste activated carbon to be regenerated; The track (22) is disposed within the tunnel kiln device (1) and the post-processing module (3), and on the connecting channel between the tunnel kiln device (1) and the post-processing module (3); The drive device (23) is connected to the kiln car (21) and is configured to drive the kiln car (21) to enter the tunnel kiln device (1) and the post-processing module (3) along the track (22) one time; The drive unit (23) is also configured to control the running speed and dwell time of the kiln car (21).

4. The waste activated carbon regeneration system according to claim 1, characterized in that, The preheating zone (11) is equipped with a temperature sensor (111), a heating element (112), and a controller (113) connected by communication. The temperature sensor (111) is configured to acquire a first temperature value within the preheating zone (11); The controller (113) is configured to compare the temperature value with a preset value. If the temperature value is less than the preset value, the controller controls the heating element (112) to increase its operating power. If the temperature value is greater than the preset value, the controller controls the heating element (112) to decrease its operating power or controls the heating element (112) to stop operating.

5. The waste activated carbon regeneration system according to claim 1, characterized in that, The roasting zone (12) is equipped with a burner (121), a fuel supply pipe (122), an air supply pipe (123), and a temperature control controller (124); The burner (121) is configured to heat the granulated carbon; the granulated carbon is used to heat the waste activated carbon to be regenerated; The fuel supply conduit (122) is connected to the burner (121), and the fuel supply conduit (122) is configured to supply fuel to the burner (121); The air supply duct (123) is connected to the burner (121), and the air supply duct (123) is configured to supply combustion air to the burner (121); The temperature control controller (124) is connected to the fuel supply pipe (122) and the air supply pipe (123). The temperature control controller (124) is configured to adjust the fuel flow rate of the fuel supply pipe (122) and the air flow rate of the air supply pipe (123) according to the second temperature value in the roasting zone (12), so that the temperature of the granulated char reaches the second preset temperature.

6. The waste activated carbon regeneration system according to claim 1, characterized in that, The firing zone (13) is equipped with a natural gas supply device (131), an oxidizing gas supply device (132), and a temperature monitoring and control unit (133); The natural gas supply device (131) is configured to supply natural gas to the firing zone (13) and ignite it; The oxidizing gas supply device (132) is configured to supply oxidizing gas to the firing zone (13); The temperature monitoring and control unit (133) is configured to acquire a third temperature value within the firing zone (13) and adjust the supply of natural gas and oxidizing gas according to the third temperature value so that the third temperature value is maintained at the third preset temperature.

7. The waste activated carbon regeneration system according to claim 1, characterized in that, The air cooler (141) in the cooling zone (14) is equipped with an air volume sensor (1411), a regulating valve (1412) and an air volume controller (1413); The air volume sensor (1411) is configured to acquire the air volume blown out by the air cooler (141); The regulating valve (1412) is installed on the air outlet duct of the air cooler (141); The air volume controller (1413) is configured to compare the air volume with a preset air volume. If the air volume is lower than the preset air volume, the controller controls the regulating valve (1412) to increase its opening. If the air volume is higher than the preset air volume, the controller controls the regulating valve (1412) to decrease its opening, so that the waste activated carbon to be regenerated is cooled to the ambient temperature.

8. The waste activated carbon regeneration system according to claim 2, characterized in that, The quench tower (44) includes: First tower body (441); a plurality of water spray devices (442) are provided inside the first tower body (441); An airflow distribution device (443) is installed inside the first tower body (441) and is located below the water spray device (442); the airflow distribution device (443) is equipped with a plurality of miniature fans (4431).

9. A waste activated carbon regeneration system according to claim 2, characterized in that, The bag filter (45) includes: Dust collector housing (451); the dust collector housing (451) is provided with a first air inlet (4511) and a first air outlet (4512); the first air inlet (4511) is located at the top of the dust collector housing (451), and the first air outlet (4512) is located at the bottom of the dust collector housing (451); A bag filter assembly (452) is disposed inside the dust collector housing (451). The bag filter assembly (452) is composed of a plurality of bags (4521). The bag filter assembly (452) is configured to filter dust in the process exhaust gas. The process exhaust gas enters the dust collector housing (451) through the first air inlet (4511), and after the dust in the process exhaust gas is filtered by the bag filter assembly (452), it is discharged into the activated carbon adsorption tower (46) through the first air outlet (4512).

10. A waste activated carbon regeneration system according to claim 2, characterized in that, The activated carbon adsorption tower (46) includes: The second tower body (461) is provided with a second air inlet (4611) and a second air outlet (4612); the second air inlet (4611) is located at the bottom of the second tower body (461), and the second air outlet (4612) is located at the top of the second tower body (461). An activated carbon filling layer (462) is disposed inside the second tower body (461). The activated carbon filling layer (462) is composed of several layers of activated carbon and is configured to adsorb organic waste gas in the process tail gas. The process tail gas enters the second tower body (461) through the second air inlet (4611), and after the activated carbon filling layer (462) adsorbs the organic waste gas in the process tail gas, it is discharged into the alkaline spray device (47) through the second air outlet (4612).

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