Central return type steam heated rotary dry ammonium furnace
By setting a central spiral drum and a separation discharge channel in the steam rotary dry ammonium furnace, the problems of material viscosity and discharge fluctuation in the return process were solved, and the stability of temperature control and energy saving were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHENGDU TIANBAO POWER SAVING ENG CO LTD
- Filing Date
- 2025-09-04
- Publication Date
- 2026-08-04
AI Technical Summary
The existing steam rotary dry ammonium furnace's return process results in high viscosity and poor fluidity of the material when the temperature of the mixture at the furnace head is low, making it easy to accumulate. As the temperature rises, the fluidity increases, leading to fluctuations in the output. Furthermore, the finished product is prone to absorbing moisture and clumping, increasing energy consumption and equipment investment.
The design adopts a central return material design. By setting a central spiral cylinder at the tail of the furnace, the return material is placed in the space formed by the outer side of the central spiral cylinder and the inner side of the rotary dry ammonium furnace body. This increases the contact area between the return material and the heating tube, thereby increasing the return material temperature. The finished product discharge channel is separated before the furnace head and wet material are premixed, thus reducing the finished product temperature.
The increased return material temperature reduced the stickiness of the mixture, stabilized the output, eliminated the need for a finished product cooling device, saved steam and cooling energy consumption, and reduced equipment investment.
Smart Images
Figure CN224593677U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of steam-heated rotary ammonium dryer technology, and particularly relates to a center-return type steam-heated rotary ammonium dryer. Background Technology
[0002] With the continuous development of the soda ash industry, production scale is constantly expanding, industry competition is intensifying, and environmental standards are becoming increasingly stringent. Against this backdrop, large-scale steam rotary ammonium chloride dryer furnaces are gradually becoming mainstream equipment due to their significant advantages. They offer high single-unit capacity, significantly reduced overall energy consumption, excellent environmental performance, long operating cycles, and low failure rates, effectively solving the pain points of high energy consumption and short continuous operation time in traditional fluidized bed ammonium chloride dryer furnaces.
[0003] However, the existing steam rotary ammonia drying furnace's return process—sending a portion of the material output from the furnace tail back to the furnace head for pre-mixing with the wet material to regulate its temperature and humidity—still has significant drawbacks. The main problem is that when the temperature of the mixture at the furnace head is low, the material is highly viscous and has poor flowability, making it prone to accumulating in the feeding section; after absorbing sufficient heat and rising in temperature, it suddenly loosens, and its flowability increases dramatically, leading to a "material surge" phenomenon inside the furnace, causing periodic and significant fluctuations in the drying furnace's output.
[0004] To maintain the temperature of the mixing material at the furnace head, two measures are often required: first, increasing the temperature and flow rate of the moisture-carrying gas; and second, raising the temperature of the returned material. However, since the returned material shares the same channel and outlet as the finished product, the temperature of the finished product rises. Excessive temperature makes the finished product highly susceptible to moisture absorption and clumping, and can damage the packaging bags during the packaging process. Therefore, additional cooling equipment must be added, which not only increases the system's energy consumption but also incurs additional equipment investment and maintenance costs. Utility Model Content
[0005] In order to overcome the shortcomings of existing technologies, the purpose of this utility model is to propose a central return steam-heated rotary dry ammonium furnace, which can increase the return temperature of the material entering the premixer and reduce the product discharge temperature.
[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a center-return type steam-heated rotary dry ammonium furnace, comprising:
[0007] The rotary dry ammonium furnace body is equipped with a finished product discharge device and a return material discharge device at the tail of the furnace.
[0008] The central spiral cylinder is located inside the tail of the rotary dry ammonium furnace; the end of the central spiral cylinder is connected to the finished product discharge part, and the space formed by the outer side of the central spiral cylinder and the inner side of the rotary dry ammonium furnace is connected to the return material discharge part.
[0009] The return material device is located outside the tail of the rotary dry ammonium furnace to receive the return material conveyed by the return material discharge component;
[0010] The premixer premixes the return material from the return device with the input material and then transfers it to the furnace head of the rotary dry ammonium furnace.
[0011] Furthermore, the central spiral cylinder is coaxially arranged with the rotary dry ammonium furnace body.
[0012] Furthermore, a discharge hood is provided at the tail of the furnace. The interior of the discharge hood is divided into a finished product discharge channel and a return material discharge channel by a partition. The finished product discharge channel is connected to the end of the central spiral cylinder, and the return material discharge channel is connected to the space outside the central spiral cylinder and inside the rotary dry ammonium furnace.
[0013] Furthermore, a return material lock air unloader is installed at the end of the return material discharge channel of the discharge hood, a scraper conveyor is provided at the outlet of the return material lock air unloader, and a bucket elevator is provided at the output end of the scraper conveyor. The bucket elevator transports the return material to the premixer.
[0014] Furthermore, a finished product airlock unloader is installed at the end of the finished product discharge channel of the discharge hood.
[0015] Furthermore, the premixer delivers the material to the burner head of the rotary dry ammonium furnace via a feeding screw, allowing the premixed material to smoothly enter the furnace body.
[0016] Furthermore, an air inlet hood is provided outside the feeding screw, and a furnace gas outlet is provided on the return material discharge hood at the tail of the rotary dry ammonium furnace. Moisture-laden gas is introduced through the air inlet hood to mix with the furnace gas and is quickly discharged from the furnace gas outlet above the tail discharge hood.
[0017] Furthermore, a feed seal is provided on the feed end of the furnace head of the rotary dry ammonium furnace body.
[0018] Furthermore, the rotary dry ammonium furnace body is supported by a roller device.
[0019] Furthermore, the rotary dry ammonium furnace body is rotated via a transmission device.
[0020] The beneficial effects of adopting this technical solution are:
[0021] In this invention, a central spiral cylinder is installed at the tail end of the furnace body. The returned material is placed in the space formed by the outer side of the central spiral cylinder and the inner side of the rotary dry ammonium furnace body. This results in a larger contact area and a longer contact time between the returned material and the heating tube in the inner wall of the rotary dry ammonium furnace body. This makes the temperature of the returned material higher than the product temperature, thereby increasing the temperature of the returned material entering the premixer. This results in the mixed material entering the furnace head section having a higher temperature and lower moisture content, reducing the stickiness of the mixed material.
[0022] In this invention, a central spiral drum is installed at the tail end of the furnace body. The central spiral drum separates the finished ammonium chloride from the returned material, preventing the finished product from contacting the heating tubes in the inner wall of the rotary dry ammonium furnace. This results in the finished product temperature being lower than the returned material temperature, reducing the finished product discharge temperature to meet the requirements of the packaging machine. This eliminates the need for a cooling device before product packaging, saving both the steam required for drying and the energy consumption of the cooling device, thus reducing equipment investment. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the internal structure of a center-return steam-heated rotary dry ammonium furnace according to the present invention.
[0024] Figure 2 This is a schematic diagram of the return material structure in an embodiment of this utility model;
[0025] Among them, 1 is the feeding screw, 2 is the air inlet hood, 3 is the feeding seal, 4 is the discharge hood, 5 is the support roller device, 6 is the rotary dry ammonium furnace body, 7 is the central screw cylinder, 8 is the transmission device, 9 is the partition plate, 10 is the finished product discharge channel, 11 is the return material discharge channel, 12 is the return material airlock unloader, 13 is the finished product airlock unloader, 14 is the premixer, 15 is the scraper conveyor, and 16 is the bucket elevator. Detailed Implementation
[0026] To make the purpose, technical solution and advantages of this utility model clearer, the present utility model will be further described below with reference to the accompanying drawings.
[0027] In this embodiment, see Figure 1 As shown, a center-return type steam-heated rotary dry ammonium furnace includes:
[0028] The rotary dry ammonium furnace body 6 is equipped with a finished product discharge device and a return material discharge device at the tail of the furnace.
[0029] The central spiral cylinder 7 is installed inside the tail of the rotary dry ammonium furnace body 6; the end of the central spiral cylinder 7 is connected to the finished product discharge part, and the space formed by the outer side of the central spiral cylinder 7 and the inner side of the rotary dry ammonium furnace body 6 is connected to the return material discharge part; the central spiral cylinder 7 is fixed inside the rotary dry ammonium furnace body 6 by a support frame and a flange. When the furnace body rotates, the spiral cylinder rotates together to achieve the function of conveying materials.
[0030] The return material device is located outside the tail of the rotary dry ammonium furnace body 6 to receive the return material conveyed by the return material discharge component;
[0031] The premixer 14 premixes the return material conveyed by the return material device with the input material and then transfers it to the furnace head of the rotary dry ammonium furnace body 6.
[0032] As an optimized embodiment, the central spiral cylinder 7 is coaxially arranged with the rotary dry ammonium furnace body 6. The central spiral cylinder 7 is fixed inside the rotary dry ammonium furnace body 6 by a support frame; when the rotary dry ammonium furnace body 6 rotates, the central spiral cylinder 7 rotates together to achieve the function of conveying materials.
[0033] As an optimized solution of the above embodiment, a discharge hood 4 is provided at the tail of the furnace. The discharge hood 4 is divided into a finished product discharge channel 10 and a return material discharge channel 11 by a partition 9. The finished product discharge channel 10 is connected to the end of the central spiral cylinder 7, and the return material discharge channel 11 is connected to the space outside the central spiral cylinder 7 and inside the rotary dry ammonia furnace body 6.
[0034] like Figure 2 As shown, a return material lock air unloader 12 is installed at the end of the return material discharge channel 11 of the discharge hood 4. A scraper conveyor 15 is provided at the outlet of the return material lock air unloader 12. A bucket elevator 16 is provided at the output end of the scraper conveyor 15. The bucket elevator 16 transports the return material to the premixer 14. The dotted line in the figure indicates the direction of return material transmission.
[0035] A finished product airlock unloader 13 is installed at the end of the finished product discharge channel 10 of the discharge hood 4. The finished products are transported to the finished product warehouse for packaging through the finished product airlock unloader 13.
[0036] As an optimized solution of the above embodiment, the premixer 14 transmits the material to the burner head of the rotary dry ammonium furnace body 6 through the feeding screw 1.
[0037] As an optimized solution of the above embodiment, an air inlet hood 2 is provided outside the feeding screw 1, and a furnace gas outlet is provided on the return material discharge hood 4 at the tail of the rotary dry ammonium furnace body 6. Moisture-laden gas is introduced through the air inlet hood 2 to mix with the furnace gas and is quickly discharged from the furnace gas outlet above the tail discharge hood 4.
[0038] As an optimization of the above embodiment, a feed seal 3 is provided on the feed end of the furnace head of the rotary dry ammonium furnace body 6.
[0039] As an optimized solution of the above embodiment, the rotary dry ammonium furnace body 6 is supported by a roller device 5.
[0040] The rotary dry ammonium furnace body 6 is rotated by the transmission device 8.
[0041] To better understand this utility model, the working principle of this utility model will be described in detail below:
[0042] In actual production, the rotary dry ammonium furnace 6 carries and dries the material. Driven by the rotation of the material, a portion of the dried material (return material) is placed in the space between the central spiral drum 7 and the rotary dry ammonium furnace 6 and discharged to the discharge hood 4 at the furnace tail. After passing through the return material airlock unloader 12, it enters the scraper conveyor 15 and bucket elevator 16, and is then transported to the external premixer 14 for thorough premixing with wet ammonium. The other portion of the dried material (finished product) is transported through the spiral tube in the center of the furnace to the discharge hood 4, and then through the finished product airlock unloader 13 to the finished product warehouse for packaging.
[0043] High-temperature return material and wet ammonium are fully premixed by an external premixer 14 and then enter the furnace head through the feed screw 1. Low-temperature drying is then carried out through steam tube bundles. To reduce furnace gas humidity, an appropriate amount of moisture-carrying gas needs to be introduced into the furnace. The moisture-carrying gas and material can be introduced in a co-current or counter-current manner. An air inlet hood 2 is installed outside the feed screw 1 at the furnace head end to mix the moisture-carrying gas with the furnace gas and quickly discharge it from the furnace gas outlet above the discharge hood 4 at the furnace tail.
[0044] 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 central return type steam heated rotary dry ammonium furnace, characterized in that, include: The rotary dry ammonium furnace body (6) is equipped with a finished product discharge part and a return material discharge part at the tail of the furnace; The central spiral cylinder (7) is located inside the tail of the rotary dry ammonium furnace body (6); the end of the central spiral cylinder (7) is connected to the finished product discharge part, and the space formed by the outer side of the central spiral cylinder (7) and the inner side of the rotary dry ammonium furnace body (6) is connected to the return material discharge part; The return material device is set outside the tail of the rotary dry ammonium furnace (6) to receive the return material conveyed by the return material discharge component; The premixer (14) premixes the return material conveyed by the return device with the input material and then transfers it to the furnace head of the rotary dry ammonium furnace body (6).
2. A central return type steam heated rotary dry ammonium furnace according to claim 1, wherein The central spiral cylinder (7) is coaxially arranged with the rotary dry ammonium furnace body (6).
3. A central return type steam heated rotary dry ammonium furnace according to claim 1, wherein A discharge hood (4) is provided at the tail of the furnace. The discharge hood (4) is divided into a finished product discharge channel (10) and a return material discharge channel (11) by a partition (9). The finished product discharge channel (10) is connected to the end of the central spiral cylinder (7), and the return material discharge channel (11) is connected to the space outside the central spiral cylinder (7) and inside the rotary dry ammonium furnace body (6).
4. A central return type steam heated rotary dry ammonium furnace according to claim 3, wherein A return material lock air unloader (12) is installed at the end of the return material discharge channel (11) of the discharge hood (4). A scraper conveyor (15) is provided at the outlet of the return material lock air unloader (12). A bucket elevator (16) is provided at the output end of the scraper conveyor (15). The bucket elevator (16) transports the return material to the premixer (14).
5. A central return type steam heated rotary dry ammonium furnace according to claim 3, wherein A finished product airlock unloader (13) is installed at the end of the finished product discharge channel (10) of the discharge hood (4).
6. A central return type steam heated rotary dry ammonium furnace according to any one of claims 1 to 5, characterized in that, The premixer (14) delivers the material to the burner head of the rotary dry ammonium furnace (6) via the feed screw (1).
7. A central return type steam heated rotary dry ammonium furnace according to claim 6, wherein An air inlet hood (2) is provided outside the feeding screw (1), and a furnace gas outlet is provided on the return material discharge hood (4) at the tail of the rotary dry ammonium furnace body (6).
8. A central return type steam heated rotary dry ammonium furnace according to any one of claims 1 to 5, characterized in that, A feed seal (3) is provided on the feed end of the furnace head of the rotary dry ammonium furnace body (6).
9. A central return type steam heated rotary dry ammonium furnace according to any one of claims 1 to 5, characterized in that, The rotary dry ammonium furnace body (6) is supported by a roller device (5).
10. A central return type steam heated rotary dry ammonium furnace according to any one of claims 1 to 5, characterized in that, The rotary dry ammonium furnace body (6) is rotated by a transmission device (8).