A rotary kiln for the precise control of steam injection in the regeneration of waste activated carbon

Abstract

This utility model discloses a rotary kiln for the regeneration of waste activated carbon with precise steam injection control, belonging to the field of resource recycling. The rotary kiln includes a kiln structure, with a steam injection mechanism fixedly installed at the upper middle part of the kiln structure. A steam replenishment mechanism is fixedly installed at the upper end of the kiln structure and at the middle of the steam injection mechanism. The steam replenishment mechanism includes a steam generator, with a water inlet on the upper side of the steam generator. A control pipe is located at the upper middle part of the steam generator, with a pressure gauge fixedly connected to the front of the outer end of the control pipe. An electric push rod is fixedly installed on the inner side of the control pipe, and a stop rod is fixedly connected to the front end of the electric push rod. This rotary kiln for the regeneration of waste activated carbon with precise steam injection control is equipped with a steam generator and a pressure gauge to monitor the steam volume. When low pressure is detected, steam is generated and delivered into the conduit to fill the conduit with steam.

Description

Technical Field

[0001] This utility model relates to the field of resource recycling, and in particular to a rotary kiln for the regeneration of waste activated carbon by controlling precise steam injection. Background Technology

[0002] Activated carbon is widely used due to its strong adsorption capacity, but it becomes saturated and waste activated carbon after use. To achieve resource recycling and reduce environmental pollution, the regeneration of waste activated carbon is crucial. Thermal regeneration is the most widely used technology for regenerating waste activated carbon, with pyrolysis regeneration being the most mature and mainstream technology in industrial applications. A rotary kiln is commonly used as the pyrolysis reactor. Precise control of steam injection ensures that steam and waste activated carbon come into full and uniform contact, improving the activation effect and thus enhancing the quality of the regenerated activated carbon. Simultaneously, precise steam injection control helps stabilize the temperature within the rotary kiln, reducing energy consumption, minimizing production accidents, and improving the efficiency and economy of the entire regeneration process.

[0003] An existing rotary kiln for the regeneration of waste activated carbon, which controls the precise injection of steam, uses the recovered steam from the waste gas to wash the surface of the activated carbon. However, in actual use, due to the low water vapor content in the waste gas and the tendency for it to overflow, it is difficult to support long-term washing of the activated carbon surface, resulting in insufficient activation of the activated carbon and a low product quality compliance rate. Therefore, we propose a rotary kiln for the regeneration of waste activated carbon that controls the precise injection of steam. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the purpose of this utility model is to provide a rotary kiln for the regeneration of waste activated carbon with precise control of steam injection. By setting a steam generator and a pressure gauge to monitor the amount of steam in the conduit, the problem of insufficient activation and low product quality compliance caused by insufficient steam can be prevented.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A rotary kiln for the regeneration of waste activated carbon with precise control of steam injection includes a kiln structure, wherein a steam injection mechanism is fixedly installed at the upper middle part of the kiln structure, and a supplementary steam mechanism is fixedly installed at the upper end of the kiln structure and at the middle part of the steam injection mechanism.

[0007] The steam replenishment mechanism includes a steam generator, with a water inlet on the upper side of the steam generator and a control pipe in the middle of the upper end of the steam generator. A pressure gauge is fixedly connected to the front side of the outer end of the control pipe, and an electric push rod is fixedly installed on the inner side of the control pipe. A stop bar is fixedly connected to the front end of the electric push rod. By setting the steam generator and the pressure gauge, the amount of steam in the conduit is monitored. When the pressure is detected to be lower than the set value, steam is generated and delivered into the conduit to keep the conduit full of steam.

[0008] Furthermore, the kiln mechanism includes a working box, with an outer shell at the upper end of the working box, an inner kiln movably installed at the inner end of the outer shell, a rotary wheel at the inner side of the inner end of the inner kiln, a tail gas treatment box fixedly installed at the rear end of the working box, and a discharge box fixedly installed at the rear end of the tail gas treatment box. By setting the tail gas treatment box, the waste gas generated by the device is treated, and water vapor is discharged for reuse, thereby improving the environmental performance of the device during use.

[0009] Furthermore, the steam injection mechanism includes a circulation box, with a conduit fixedly connected to the upper middle part of the circulation box, a branch pipe fixedly connected to the lower end of the conduit, a control valve fixedly installed at the lower end of the branch pipe, and a steam nozzle installed at the bottom of the lower end of the control valve. The conduit passes through the movable sealing ring and is dynamically sealed to it. By setting up a circulation box to circulate the water vapor in the device, and adding multiple steam nozzles to perform a comprehensive spraying and rinsing, it is easy to achieve the effect of precise spraying of activated carbon.

[0010] Furthermore, the control pipe is fixedly connected to the conduit, and the control pipe is connected to the conduit. By setting the control pipe, the airflow direction in the conduit is controlled, so that the steam generated when the steam generator is working is completely delivered to the control valve, avoiding the steam from flowing back to the circulation box through the conduit and causing steam waste, thus improving the environmental performance of the device during use.

[0011] Furthermore, the circulation box is fixedly installed at the upper middle part of the exhaust gas treatment box.

[0012] Furthermore, there are two control valves, which are fixedly connected to the upper middle part of the housing.

[0013] Furthermore, the number of steam nozzles is several, and the steam nozzles are connected to the inner kiln.

[0014] Furthermore, the steam generator is fixedly installed on the upper side of the housing.

[0015] In summary, this utility model has the following beneficial effects:

[0016] 1. By setting up a steam generator and a pressure gauge, the amount of steam in the duct is monitored. When the pressure is detected to be lower than the set value, steam is generated and delivered into the duct to keep the duct full of steam. By setting up a tail gas treatment box, the waste gas generated by the device is treated and the water vapor is discharged for reuse, which improves the environmental performance of the device during use.

[0017] 2. By setting up a circulation box to recycle the water vapor in the device, and adding multiple steam nozzles for comprehensive spraying and rinsing, it is easy to achieve the effect of precise spraying of activated carbon. By setting up a control pipe to control the air flow direction in the duct, the steam generated by the steam generator is completely delivered to the control valve, avoiding steam flowing back to the circulation box through the duct and causing steam waste, thus improving the environmental performance of the device during use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure in this embodiment;

[0019] Figure 2 This is a three-dimensional structural diagram of the kiln mechanism in this embodiment;

[0020] Figure 3 This is a three-dimensional structural diagram of the steam injection mechanism in this embodiment;

[0021] Figure 4 This is a three-dimensional structural diagram of the steam replenishment mechanism in this embodiment;

[0022] Figure 5 This is a partial three-dimensional structural diagram of the steam replenishment mechanism in this embodiment.

[0023] In the diagram, 1. Kiln structure; 101. Working box; 102. Outer shell; 103. Inner kiln; 104. Rotary wheel; 105. Tail gas treatment box; 106. Discharge box; 2. Steam injection mechanism; 201. Circulation box; 202. Pipe; 203. Branch pipe; 204. Control valve; 205. Steam nozzle; 206. Movable sealing ring; 3. Steam replenishment mechanism; 301. Steam generator; 302. Water inlet; 303. Control pipe; 304. Pressure gauge; 305. Electric push rod; 306. Stop bar. Detailed Implementation

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions toward or away from the geometric center of a specific part, respectively.

[0026] Reference Figure 1-5 As shown, a rotary kiln for the regeneration of waste activated carbon with precise control of steam injection is shown in a preferred embodiment of the present invention. It includes a kiln mechanism 1, a steam injection mechanism 2 fixedly installed at the upper middle part of the kiln mechanism 1, and a supplementary steam mechanism 3 fixedly installed at the upper end of the kiln mechanism 1 and at the middle part of the steam injection mechanism 2.

[0027] The steam replenishment mechanism 3 includes a steam generator 301. A water inlet 302 is provided on the upper side of the steam generator 301. A control pipe 303 is provided in the middle of the upper end of the steam generator 301. A pressure gauge 304 is fixedly connected to the front side of the outer end of the control pipe 303. An electric push rod 305 is fixedly installed on the inner side of the control pipe 303. A stop rod 306 is fixedly connected to the front end of the electric push rod 305. The steam generator 301 is fixedly installed on the upper side of the outer casing 102. By setting the steam generator 301 and the pressure gauge 304, the amount of steam in the conduit 202 is monitored. When the pressure is detected to be lower than the set value, steam is generated and delivered to the conduit 202 to keep the steam in the conduit 202 always in a full state.

[0028] Reference Figure 1-2 As shown, the kiln mechanism 1 includes a working box 101, an outer shell 102 is provided at the upper end of the working box 101, an inner kiln 103 is movably installed at the inner end of the outer shell 102, a rotary wheel 104 is provided on the inner side of the inner end of the inner kiln 103, a tail gas treatment box 105 is fixedly installed at the rear end of the working box 101, and a discharge box 106 is fixedly provided at the rear end of the tail gas treatment box 105. By setting the tail gas treatment box 105, the waste gas generated by the device is treated, and water vapor is discharged for reuse, which improves the environmental performance of the device during use.

[0029] Reference Figure 1-3 As shown, the steam injection mechanism 2 includes a circulation box 201. A conduit 202 is fixedly connected to the upper middle part of the circulation box 201. A branch pipe 203 is fixedly connected to the lower end of the conduit 202. A control valve 204 is fixedly installed at the lower end of the branch pipe 203. A steam nozzle 205 is installed at the bottom of the lower end of the control valve 204. The conduit 202 passes through the movable sealing ring 206 and is dynamically sealed to it. There are two control valves 204, which are fixedly connected to the upper middle part of the outer shell 102. The circulation box 201 is fixedly installed at the upper middle part of the exhaust gas treatment box 105. The steam in the device is recycled by setting up the circulation box 201. There are several steam nozzles 205, which are connected to the inner kiln 103. By adding multiple steam nozzles 205 to perform a covering spray scouring, it is easy to achieve the effect of precise spraying of activated carbon.

[0030] Reference Figure 3-5As shown, the control pipe 303 is fixedly connected to the conduit 202, and the control pipe 303 is connected to the conduit 202. By setting the control pipe 303, the air flow direction in the conduit 202 is controlled, so that the steam generated by the steam generator 301 is completely delivered to the control valve 204, avoiding the steam from flowing back to the circulation box 201 through the conduit 202 and causing steam waste, thus improving the environmental performance of the device during use.

[0031] Specific implementation process: First, assemble the device. Once assembled, it is ready for use. During operation, a forklift is used to transfer the qualified bagged granular waste activated carbon to the production workshop. A bucket elevator or a spare electric hoist is used to transport the waste activated carbon to the weighing feeding hopper. The bags are broken open, and the material leaks into the hopper. The hopper discharges the material to the screw feeder, which feeds the waste activated carbon into the rotary kiln at regular intervals and in fixed quantities. The main equipment of the waste activated carbon activation and regeneration line is the rotary kiln, which adopts a cylindrical structure. The exterior of the furnace is made of steel plate, and the interior is lined with lightweight refractory insulation material, which can effectively reduce the heat loss from the furnace. The inner wall is made of wear-resistant castable material, which can work reliably for a long time at high temperatures. The kiln uses direct heating. Due to the rotation of the cylinder, the waste material mixes thoroughly with the air, resulting in a fast gasification rate and a high burnout rate. To ensure the downward transport of the material, the rotary kiln must maintain a certain inclination. The design inclination of the rotary kiln in this project is 1%. Due to the fluctuations in the feed of waste activated carbon, the regeneration time of waste activated carbon varies. The rotary kiln speed needs to have a large range of adjustment. The design speed of the rotary kiln in this project is 0.2 to 1.5 rpm. As the material advances in the rotary kiln, the heating temperature of the rotary kiln gradually increases. The rotary kiln temperature is controlled between 150 and 750°C. The low-boiling-point organic matter adsorbed in the activated carbon is gradually separated. At the same time, as the temperature rises, the high-boiling-point organic matter is decomposed, carbonized, and oxidized. The residence time of the carbonization stage is about 20 minutes. To prevent activated carbon from being oxidized, the amount of air drawn into the rotary kiln will be strictly controlled to ensure that the oxygen content at the kiln tail is kept below 0.5%. In the subsequent activation stage, the rotary kiln temperature will be raised to 750-850℃. The steam generated by the high-temperature vaporization of moisture in the raw waste activated carbon, as well as the CO2 generated by the oxidation reaction during the calcination stage, will clean the micropores of the activated carbon, vaporizing the organic residues that are clogging the fine pores, thereby restoring its adsorption performance. When the pressure gauge 304 indicates insufficient steam, the steam generator 301 will generate steam to supplement it. During recharging, the electric push rod 305 pushes the stop rod 306 to form a closure between it and the guide tube 202, causing the steam to move towards the steam nozzle 205. The saturated steam is injected from the steam nozzle 205 into the activation section about 3m away from the discharge port. The inner kiln and the jet valve are dynamically sealed. The jet valve is fixed in operation, and the inner kiln can rotate. After the steam generator 301 has been working for a period of time, it automatically shuts off and continues to work using circulating steam for flushing. Finally, the activated product is discharged to the discharge box 106 for rapid cooling and then recycled and packaged.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A spent activated carbon regeneration rotary kiln for controlling precise injection of steam, characterized by: It includes a kiln mechanism (1), a steam injection mechanism (2) is fixedly installed at the upper middle part of the kiln mechanism (1), and a supplementary steam mechanism (3) is fixedly installed at the upper end of the kiln mechanism (1) and at the middle part of the steam injection mechanism (2); The steam replenishment mechanism (3) includes a steam generator (301), with a water inlet (302) provided on the upper side of the steam generator (301), a control pipe (303) provided in the middle of the upper end of the steam generator (301), a pressure gauge (304) fixedly connected to the front side of the outer end of the control pipe (303), an electric push rod (305) fixedly installed on the inner side of the control pipe (303), and a stop rod (306) fixedly connected to the front end of the electric push rod (305).

2. A rotary kiln for regenerating spent activated carbon by accurately injecting steam, according to claim 1, characterized in that: The kiln mechanism (1) includes a working box (101), an outer shell (102) is provided at the upper end of the working box (101), an inner kiln (103) is movably installed at the inner end of the outer shell (102), a rotary wheel (104) is provided on the inner side of the inner end of the inner kiln (103), a tail gas treatment box (105) is fixedly installed at the rear end of the working box (101), and a discharge box (106) is fixedly provided at the rear end of the tail gas treatment box (105).

3. The rotary kiln for regenerating waste activated carbon with precise steam injection control according to claim 2, characterized in that: The steam injection mechanism (2) includes a circulation box (201), a conduit (202) is fixedly connected to the middle of the upper end of the circulation box (201), a branch pipe (203) is fixedly connected to the lower end of the conduit (202), a control valve (204) is fixedly installed at the lower end of the branch pipe (203), a steam nozzle (205) is installed at the bottom of the lower end of the control valve (204), and the conduit (202) passes through the movable sealing ring (206) and is dynamically sealed to it.

4. The rotary kiln for regenerating waste activated carbon with precise steam injection control according to claim 3, characterized in that: The control tube (303) is fixedly connected to the conduit (202), and the control tube (303) is in communication with the conduit (202).

5. A rotary kiln for the precise injection of controlled steam for the regeneration of waste activated carbon according to claim 3, characterized in that: The circulation box (201) is fixedly installed at the upper middle part of the exhaust gas treatment box (105).

6. A rotary kiln for the precise injection of controlled steam for the regeneration of waste activated carbon according to claim 3, characterized in that: There are two control valves (204), and the two control valves (204) are fixedly connected to the upper middle part of the housing (102).

7. A rotary kiln for the precise injection of controlled steam for the regeneration of waste activated carbon according to claim 3, characterized in that: The number of steam nozzles (205) is several, and the steam nozzles (205) are connected to the inner kiln (103).

8. A rotary kiln for the precise injection of controlled steam for the regeneration of waste activated carbon according to claim 2, characterized in that: The steam generator (301) is fixedly installed on the upper side of the outer casing (102).

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