A device for recovering and reusing alkali steam from an alkali-activated rotary furnace.
By designing an alkali steam recovery and reuse device in the rotary kiln for alkali activation, the problem of alkali recovery and utilization in the tail gas was solved, realizing the reuse and preheating recovery of alkali, reducing production costs and improving resource utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XINJIANG HANHANG TECH CO LTD
- Filing Date
- 2025-07-08
- Publication Date
- 2026-06-02
AI Technical Summary
In the existing technology, the problem of alkali recovery and utilization in the tail gas during the preparation of porous carbon in a rotary kiln has not been effectively solved.
Design an alkaline steam recovery and reuse device for an alkaline activation rotary kiln. The device mixes the rotary kiln tail gas with new raw materials through a mixing tank, recovers the alkaline in the tail gas, and uses the preheating of the rotary kiln as the heat source for the drying equipment to achieve the reuse of alkaline.
The alkali in the rotary kiln tail gas was effectively recovered and utilized, which reduced production costs, improved resource utilization, and realized the preheating recovery of the rotary kiln.
Smart Images
Figure CN224308144U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of thermal equipment technology, specifically relating to an alkaline steam recovery and reuse device for an alkaline activation rotary furnace. Background Technology
[0002] Rotary furnaces, as crucial thermal equipment, occupy an indispensable position in industrial production and are widely used in various fields. In the traditional building materials industry, they are key equipment in cement production, often referred to as the "heart" of a cement plant, used to calcine cement clinker, causing a series of physical and chemical reactions in the raw materials to form cement products with specific properties. In the traditional metallurgical industry, rotary furnaces play a vital role, for example, in the magnetizing roasting of lean iron ore, altering the ore's magnetism to make it more suitable for magnetic separation and improving iron recovery rates; in recycled aluminum production, rotary furnaces can process various complex sources of waste aluminum materials, including industrial scraps and end-of-life automotive parts. In the chemical industry, rotary furnaces are used to produce soda, calcined phosphate fertilizers, barium sulfide, etc., offering advantages such as low energy consumption, low electricity consumption, no need for sulfuric acid, and the ability to utilize medium- and low-grade phosphate ore, effectively reducing production costs and improving resource utilization. In the environmental protection field, developed countries have been using cement kilns (a type of rotary kiln) to incinerate hazardous waste and garbage for over 20 years. This has not only achieved waste reduction and harmlessness but also utilized the waste as fuel, saving coal powder and realizing waste resource utilization. In the new energy field, rotary kilns are important equipment for preparing positive and negative electrode materials, especially for the preparation of activated carbon.
[0003] In recent years, the rapid development of new energy sources has placed higher demands on electrode materials. Among various anode materials, silicon-carbon anodes are the most promising. However, the preparation of silicon-carbon anodes requires high-performance porous carbon as the matrix material. Alkali activation is the most promising method for preparing high-performance porous carbon. Currently, the ideal equipment for alkali activation of porous carbon is a rotary kiln. The main problem with this process is the recovery and utilization of alkali in the tail gas. Summary of the Invention
[0004] This invention aims to solve the problem of alkali recovery and utilization in the tail gas of the process of preparing porous carbon by alkali activation in a rotary kiln, and provides an alkali steam recovery and reuse device for alkali activation rotary kiln, which also realizes the preheating recovery of the rotary kiln.
[0005] The technical solution adopted by this utility model is:
[0006] A device for recovering and reusing alkali steam from an alkali-activated rotary kiln includes a drying unit, a raw material silo, a mixing slurry conveying pump, and a mixing tank. The inlet of the mixing tank is connected to the tail gas pipe of the rotary kiln for conveying the tail gas of the rotary kiln. The feed end of the mixing tank is connected to the raw material silo. The mixing tank is used to mix the raw materials and tail gas and recover alkali from the tail gas. The liquid outlet of the mixing tank is connected to the feed end of the drying unit through a mixing circuit. The discharge end of the drying unit is connected to the feed port of the rotary kiln's furnace head to send the mixture to the rotary kiln for activation. A mixing slurry conveying pump is installed on the mixing circuit.
[0007] Furthermore, the drying equipment forms a heat exchange cycle with the rotary kiln tubes of the rotary kiln through the heat exchanger inlet pipe and the heat exchanger return pipe.
[0008] Furthermore, a heat exchanger delivery pump is installed on the heat exchanger inlet pipe.
[0009] Furthermore, the mixing tank is provided with a gas outlet and a solvent inlet, and a stirring device is installed inside the mixing tank.
[0010] Furthermore, a mixing feed hopper is provided at the furnace head feed inlet of the rotary kiln, and a mixing silo discharge outlet is provided above the mixing feed hopper.
[0011] Furthermore, multiple temperature measuring devices are evenly distributed on the rotary kiln tubes.
[0012] Compared with the prior art, the present invention has the following advantages:
[0013] This invention introduces the exhaust gas generated by the rotary kiln into a mixing tank, where it is mixed and reacted with new raw materials from the raw material silo, effectively recovering and utilizing the alkali in the exhaust gas. At the same time, the preheating generated by the operation of the rotary kiln is used as the heat source for the drying equipment, successfully solving the problem of alkali recovery and utilization in the exhaust gas of the process of preparing porous carbon by alkali activation in a rotary kiln. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] The components are as follows: 1. Furnace tail gas inlet; 2. Transmission device; 3. Temperature measuring device; 4. Heat exchanger return pipe; 5. Mixing silo; 6. Drying equipment; 7. Screw conveyor plate; 8. Raw material silo; 9. Mixing circuit; 10. Stirring device; 11. Mixing slurry conveying pump; 12. Mixing tank; 13. Rotary furnace tail gas pipe; 14. Heat exchanger inlet pipe; 15. Heat exchanger conveying pump; 16. Mixing feed hopper; 17. Rotary furnace tube; 18. Rotary furnace support frame; 19. Heating device; 20. Rotary furnace support base; 21. Furnace tail discharge port; 22. Gas outlet; 23. Solvent inlet. Detailed Implementation
[0016] To better understand the purpose, structure, and function of this utility model, a more detailed description of this utility model will be provided below with reference to the accompanying drawings.
[0017] like Figure 1 As shown, this utility model provides an alkali steam recovery and reuse device for an alkali activation rotary kiln, including a drying device 6, a raw material silo 8, a mixing slurry conveying pump 11, and a mixing tank 12; the air inlet of the mixing tank 12 is connected to the rotary kiln tail gas pipe 13 for conveying the tail gas of the rotary kiln, the feed end of the mixing tank 12 is connected to the raw material silo 8, the mixing tank 12 is used to mix the raw materials and tail gas, and recover the alkali in the tail gas, the liquid outlet of the mixing tank 12 is connected to the feed end of the drying device 6 through a mixing circuit 9, the discharge end of the drying device 6 is connected to the furnace head feed port of the rotary kiln, and the mixing material is sent to the rotary kiln for activation, and a mixing slurry conveying pump 11 is installed on the mixing circuit 9.
[0018] The drying equipment 6 forms a heat exchange cycle with the rotary kiln tube 17 of the rotary kiln through the heat exchanger inlet pipe 14 and the heat exchanger return pipe 4.
[0019] A heat exchanger delivery pump 15 is installed on the heat exchanger inlet pipe 14.
[0020] The mixing tank 12 is provided with a gas outlet 22 and a solvent inlet 23, and a stirring device 10 is installed inside the mixing tank 12.
[0021] The rotary kiln is provided with a mixing feed hopper 16 at the furnace head feed inlet, and a mixing silo 5 is provided above the mixing feed hopper 16.
[0022] Multiple temperature measuring devices 3 are evenly distributed on the rotary kiln tube 17.
[0023] The rotary kiln tube 17 is mounted on the rotary kiln support frame 18 via the rotary kiln support base 20, and the rotary kiln tube 17 is driven to rotate by the transmission device 2. A heating device 19 is installed inside the rotary kiln tube 17.
[0024] The mixture is fed from the mixing bin 5 into the rotary kiln tube 17 of the rotary kiln through the mixing feed hopper 16 at the bottom of the furnace head for heating and activation. After activation, the material is discharged from the discharge port 21 at the tail of the rotary kiln.
[0025] Gas enters the rotary kiln through the tail gas inlet 1 and the gas produced by the mixing reaction enters the mixing tank 12 through the rotary kiln tail gas pipe 13. The alkali in the tail gas is mixed with the raw material conveyed by the raw material silo 8. The remaining gas is discharged through the gas outlet 22. The mixed liquid in the mixing tank is conveyed to the drying equipment 6 by the mixing slurry conveying pump 11. The spiral conveyor plate 7 in the drying equipment 6 conveys the dried mixture back to the rotary kiln for activation.
[0026] The heat in the drying equipment 6 comes from the preheating in the rotary kiln. The heat is carried by the heat exchanger and enters the drying equipment through the heat exchanger inlet pipe 14 via the heat exchanger delivery pump 15. Then the heat exchanger enters the rotary kiln through the heat exchanger return pipe 4 for preheating and recovery.
[0027] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.
Claims
1. A device for recovering and reusing alkali steam in an alkali-activated rotary furnace, characterized in that: It includes a drying device (6), a raw material silo (8), a mixing slurry conveying pump (11), and a mixing tank (12); the air inlet of the mixing tank (12) is connected to the rotary kiln tail gas pipe (13) to convey the tail gas of the rotary kiln, the feed end of the mixing tank (12) is connected to the raw material silo (8), the mixing tank (12) is used to mix raw materials and tail gas, and recover alkali in the tail gas, the liquid outlet of the mixing tank (12) is connected to the feed end of the drying device (6) through the mixing circuit (9), the discharge end of the drying device (6) is connected to the furnace head feed port of the rotary kiln to send the mixture to the rotary kiln for activation, and the mixing slurry conveying pump (11) is installed on the mixing circuit (9).
2. The alkali steam recovery and reuse device for an alkali-activated rotary furnace according to claim 1, characterized in that: The drying equipment (6) forms a heat exchange cycle with the rotary kiln tube (17) of the rotary kiln through the heat exchanger inlet pipe (14) and the heat exchanger return pipe (4).
3. The alkali steam recovery and reuse device for an alkali-activated rotary kiln according to claim 2, characterized in that: A heat exchanger delivery pump (15) is installed on the heat exchanger inlet pipe (14).
4. The alkali steam recovery and reuse device for an alkali-activated rotary furnace according to claim 1, characterized in that: The mixing tank (12) is provided with a gas outlet (22) and a solvent inlet (23), and a stirring device (10) is installed inside the mixing tank (12).
5. The alkali steam recovery and reuse device for an alkali-activated rotary kiln according to claim 1, characterized in that: The rotary kiln is provided with a mixing feed hopper (16) at the furnace head feed inlet, and the mixing silo (5) is provided above the mixing feed hopper (16) for discharge.
6. The alkali steam recovery and reuse device for an alkali-activated rotary kiln according to claim 2, characterized in that: Multiple temperature measuring devices (3) are evenly distributed on the rotary kiln tube (17).