Two-stage discharging structure of steam rotary furnace

Abstract

The utility model discloses a kind of two-section discharging structures of steam rotary furnace, including steam rotary furnace cylinder body of oblique installation, the finished product conveying assembly of the center setting in cylinder body, steam rotary furnace cylinder body tail is used for finished product and return material discharging, the discharging cover of furnace steam discharging;The steam rotary furnace cylinder body is internally arranged with steam heat exchange pipe in concentric circle, steam rotary furnace cylinder body high end is provided with material inlet, at least 1 cylinder body finished product outlet of uniform distribution and at least 1 return material outlet of uniform distribution are set up on steam rotary furnace cylinder body tail, the utility model realizes finished product and return material segmented processing and respectively discharging, finished product obtained after drying in front section is directly guided out through finished product conveying pipe, obtain low-temperature product, without subsequent cooling;Return material continues to heat in furnace rear section, meet high-temperature return material demand, effectively reduce energy consumption and equipment investment.

Description

Technical Field

[0001] This utility model relates to the field of steam rotary kiln technology, specifically to a two-stage discharge structure for a steam rotary kiln. Background Technology

[0002] In the process of using a steam rotary dryer to dry viscous materials at low temperatures, in order to prevent material sticking and enhance fluidity, it is usually necessary to add some high-temperature finished material as return material to mix with the low-temperature wet material, so as to reduce the feed moisture and increase the feed temperature to meet the actual needs of the project.

[0003] For the drying of ammonium chloride, existing steam rotary kilns use increased discharge temperature to obtain high-temperature return material, but this leads to a simultaneous increase in the finished product temperature. While ammonium chloride can be dried to around 80℃ to obtain a qualified product, the discharge temperature needs to be increased to 120℃ to raise the furnace head temperature and prevent material accumulation and blockage. Calculations show that increasing the temperature from 80℃ to 120℃ increases steam consumption by 32 kg per ton of dry ammonium product, and additional cooling devices are required in subsequent processes, significantly increasing production energy consumption and equipment investment costs.

[0004] Meanwhile, if the existing technology uses an external spiral tube to achieve two-stage discharge, the diameter of the rear rolling ring and gears needs to be increased, which increases equipment costs; if a finished product gas discharge hood is added in the middle section of the furnace body, it will increase the number of sealing leakage points, reduce the operational stability of the rotary kiln, and make it difficult to balance production needs with equipment economy and reliability. Utility Model Content

[0005] This utility model addresses the technical problems existing in the prior art by providing a two-stage discharge structure for a steam rotary furnace, thus solving the problem of excessively high finished product temperature and increased energy consumption caused by the existing steam rotary furnaces for ammonium chloride drying in order to obtain high-temperature return material.

[0006] To achieve the above objectives, this utility model provides a two-stage discharge structure for a steam rotary kiln, including an inclined steam rotary kiln cylinder, a finished product conveying assembly disposed at the center of the cylinder, and a discharge hood at the tail of the steam rotary kiln cylinder for discharging finished products and return materials, as well as for discharging furnace steam. The steam rotary kiln cylinder has concentrically arranged steam heat exchange tubes inside, a material inlet at the high end of the cylinder, and at least one evenly distributed finished product outlet and at least one evenly distributed return material outlet at the tail end of the cylinder. The finished product conveying assembly includes a finished product conveying pipe, a lifting device, and a support. The inlet of the finished product conveying pipe is located on the furnace head side and is connected to the lifting device. The diameter of the finished product conveying outlet is the inner diameter of the conveying pipe. It is located at the tail of the rotary kiln and communicates with the finished product outlet of the cylinder. The bracket fixes the finished product conveying pipe 2 to the center of the cylinder through the outer wall of the finished product conveying pipe and the upper component inside the cylinder of the steam rotary kiln. The discharge hood is located at the tail of the steam rotary kiln cylinder, covering the finished product discharge port and the return material outlet of the cylinder. The cylinder of the steam rotary kiln is provided with a cylinder partition ring plate. The cylinder partition ring plate and the discharge hood partition plate of the discharge hood are combined to form independent channels for finished products and return materials.

[0007] Based on the above technical solution, the present invention can be further improved as follows.

[0008] Preferably, the finished product conveying pipe is concentrically arranged with the steam rotary kiln cylinder and has sufficient radial distance from the innermost concentrically arranged steam heat exchanger pipe.

[0009] Preferably, the inlet of the finished product conveying component is located on the feed port side of the rotary kiln, the feed port of the finished product conveying component is equipped with a lifting device, and the outlet of the finished product conveying component is located at the tail of the rotary kiln.

[0010] Preferably, the material lifting device is a material lifting hopper, the length of which is adapted to any position from the outer wall of the finished product conveying pipe to the inner wall of the steam rotary furnace cylinder.

[0011] Preferably, the steam rotary kiln has an ash-blocking ring inside the cylinder at the tail end, located between the finished product outlet and the return material outlet. The ash-blocking ring has a return material outlet on the cylinder near the front of the furnace head, and a finished product outlet on the cylinder near the rear of the furnace tail.

[0012] Preferably, a cylinder partition ring plate is provided on the outer wall of the cylinder corresponding to the ash-blocking ring inside the cylinder.

[0013] Preferably, the outlet of the finished product conveying pipe extends towards the tail of the furnace and passes through the ash-blocking ring to communicate with the finished product discharge port of the furnace body.

[0014] Preferably, the discharge hood is provided with a discharge hood partition inside, which is located on the rear side of the cylinder dividing ring plate near the furnace tail, with a certain gap between the two.

[0015] Preferably, the finished product conveying pipe is arranged axially along the steam rotary kiln body in the middle and rear part of the steam rotary kiln body, and the length of the finished product conveying pipe is less than that of the steam rotary kiln body.

[0016] Preferably, a spiral belt is provided inside the finished product conveying pipe.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: The system enables segmented processing and separate discharge of finished products and return materials. The finished products obtained after the initial drying are directly discharged through the finished product conveying pipe to obtain low-temperature products without subsequent cooling. The return materials continue to be heated in the later stage of the furnace to meet the requirements of high-temperature return materials, effectively reducing energy consumption and equipment investment. There is no need to install an external spiral tube, avoiding the need to increase the diameter of the rear rolling ring and gears, thus saving equipment costs; there is no need to add a discharge hood in the middle section of the furnace body, simplifying the structure, reducing sealing leakage points, and improving the operational stability of the rotary kiln. The combination of the rotating dividing ring plate on the cylinder and the stationary dividing plate on the discharge hood can accurately divide the discharge hood into two channels: one for return material and one for finished product, thus preventing the finished product from mixing with the return material. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the steam rotary furnace of this utility model; Figure 2 This is a side view of the material lifting hopper of the finished product conveying component of the steam rotary furnace of this utility model; Figure 3 This is a schematic diagram of the finished product discharge section of the steam rotary furnace cylinder of this utility model.

[0019] The meanings of the labels in the diagram are as follows: 1. Steam rotary furnace shell; 101. Material inlet; 102. Steam heat exchange tube; 103. Shell return material outlet; 104. Shell finished product outlet; 105. Ash baffle ring; 106. Shell partition ring plate; 2. Finished product conveying pipe; 201. Hopper; 202. Support frame; 203. Spiral belt; 204. Finished product conveying outlet; 3. Discharge hood; 301. Discharge hood partition. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-3 As shown, this embodiment provides a two-stage discharge structure for a steam rotary kiln, including an inclined steam rotary kiln cylinder 1, a finished product conveying assembly set in the center of the cylinder, and a discharge hood 3 at the tail of the steam rotary kiln cylinder 1 for discharging finished products and return materials, and for discharging furnace steam. The steam rotary kiln cylinder 1 has concentrically arranged steam heat exchange tubes 102 inside for indirect heat exchange with materials to achieve drying and heating. The high end of the steam rotary kiln cylinder 1 is provided with a material inlet 101 for premixed materials to enter the furnace. At least one uniformly distributed cylinder finished product outlet 104 and at least one uniformly distributed cylinder return material outlet 103 are opened at the tail of the steam rotary kiln cylinder 1 for discharging low-temperature qualified finished products and outputting high-temperature return materials, respectively. The finished product conveying assembly includes a finished product conveying pipe 2, a lifting device, and a support 202. The inlet of the finished product conveying pipe 2 is located on the furnace head side and is connected to the lifting device, which can efficiently grab qualified finished products in the furnace and send them into the conveying pipe. The diameter of the finished product conveying outlet 204 is the inner diameter of the conveying pipe. It is located at the tail of the rotary kiln and communicates with the finished product outlet 104 of the cylinder, realizing the directional discharge of finished products. The support 202 fixes the finished product conveying pipe 2 to the center of the cylinder through the outer wall of the finished product conveying pipe 2 and the upper component inside the cylinder 1 of the steam rotary kiln, ensuring that it operates synchronously and stably with the furnace. The discharge hood 3 is located at the tail of the steam rotary kiln cylinder 1, covering the finished product outlet and the return material outlet of the cylinder. The cylinder 1 of the steam rotary kiln is provided with a cylinder dividing ring plate 106. The cylinder dividing ring plate 106 and the discharge hood partition plate 301 of the discharge hood 3 are combined to form independent channels for finished products and return materials, realizing the diversion and conveying.

[0022] The finished product conveying pipe 2 is concentrically arranged with the steam rotary furnace cylinder 1, and has sufficient radial distance from the innermost concentrically arranged steam heat exchange pipe 102 to avoid the heat exchange process affecting the temperature of the finished product.

[0023] The material lifting device is a material lifting hopper 201, and the length of the material lifting hopper 201 is adapted to any position from the outer wall of the finished product conveying pipe 2 to the inner wall of the steam rotary furnace cylinder 1.

[0024] The steam rotary furnace has an ash-blocking ring 105 inside the cylinder at the tail end, between the finished product outlet and the return material outlet. The ash-blocking ring 105 has a return material outlet on the front side of the cylinder near the furnace head and a finished product outlet on the rear side of the cylinder near the furnace tail. This can prevent high-temperature materials from the return material area from mixing into the finished product channel.

[0025] A cylinder partition ring plate 106 is provided on the outer wall of the steam rotary furnace cylinder 1, corresponding to the ash baffle ring 105 inside the cylinder, which works in conjunction with the discharge hood partition plate 301 to achieve channel separation.

[0026] The outlet of the finished product conveying pipe 2 extends towards the tail of the furnace and passes through the ash-blocking ring 105 to connect with the finished product discharge port of the furnace body, ensuring that the finished product is discharged smoothly.

[0027] The discharge hood 3 is equipped with a discharge hood baffle 301 inside, which is located on the rear side of the cylinder dividing ring plate 106 near the furnace tail. There is a certain gap between the two to accommodate the thermal expansion requirements of the rotating and stationary components of the furnace.

[0028] The finished product conveying pipe 2 is arranged axially along the steam rotary kiln body 1 in the middle and rear part of the steam rotary kiln body 1. The length of the finished product conveying pipe 2 is less than that of the steam rotary kiln body 1, which precisely corresponds to the finished product drying area and avoids interfering with the subsequent return material heating process.

[0029] A spiral belt 203 is installed inside the finished product conveying pipe 2 to help the finished product be conveyed smoothly inside the pipe and prevent material from stagnating and blocking.

[0030] According to actual production needs, if it is necessary to enhance the insulation effect of the finished product, the insulation layer of the finished product conveying pipe 2 can be thickened; if the method of carrying moisture into the furnace tail is adopted, cold moisture can be introduced through the jacket of the finished product conveying pipe 2.

[0031] In summary, the workflow of this solution is as follows: Finished product flow: The premixed ammonium chloride material enters the steam rotary furnace cylinder 1 through the material inlet 101. Under the rotation of the cylinder, it moves towards the lower discharge end. During the forward movement, it indirectly exchanges heat with the steam heat exchange tube 102. After passing through the front-end finished product drying section, it forms a qualified finished product. Part of the qualified finished product is sent to the finished product conveying pipe 2 by the lifting hopper 201. The finished product conveying pipe 2 is located in the center of the cylinder and maintains a sufficient distance from the steam heat exchange tube 102. Combined with the pipe wall insulation measures, the finished product can be kept at a low temperature. The outlet of the finished product conveying pipe 2 extends towards the tail of the furnace and passes through the ash baffle ring 105. It enters the finished product cavity in the furnace composed of the ash baffle ring 105, the cylinder 1, and the steam chamber rear plate. The finished product is discharged from the finished product conveying outlet 204. Through the finished product outlets 104 evenly arranged on the cylinder 1, it enters the finished product channel in the discharge hood 3, which is formed by the combination of the cylinder dividing ring plate 106 and the discharge hood partition plate 301. Finally, it enters the packaging process. Return material process: Most of the material after passing through the finished product drying section continues to move towards the rear section of the furnace. In the return material heating section, it continuously absorbs heat from the steam heat exchange tube 102 to raise the temperature. When it reaches the tail ash baffle ring 105, the high-temperature material enters the corresponding return material channel inside the discharge hood 3 from the discharge port 103 evenly arranged on the cylinder in front of the ash baffle ring 105, and is finally sent to the return material conveying device. The rotating cylinder partition ring plate 106 cooperates with the stationary discharge hood partition plate 301 to ensure that the finished product and the return material channel are independently sealed to avoid mutual interference.

[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 preferred examples and are not intended to limit the 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 claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A two-stage discharge structure for a steam rotary kiln, characterized in that: The steam rotary furnace includes an inclined steam rotary furnace cylinder (1), a finished product conveying assembly set in the center of the cylinder, and a discharge hood (3) at the tail of the steam rotary furnace cylinder (1) for finished product and return material discharge and furnace steam discharge; the steam rotary furnace cylinder (1) has concentric steam heat exchange tubes (102) arranged inside, a material inlet (101) at the high end of the steam rotary furnace cylinder (1), and at least one uniformly distributed cylinder finished product outlet (104) and at least one uniformly distributed return material outlet at the tail of the steam rotary furnace cylinder (1); The finished product conveying assembly includes a finished product conveying pipe (2), a material lifting device, and a support (202). The inlet of the finished product conveying pipe (2) is located on the furnace head side and connected to the material lifting device. The diameter of the finished product conveying outlet (204) is the inner diameter of the conveying pipe. It is located at the tail of the rotary kiln and communicates with the finished product outlet (104) of the cylinder. The support (202) fixes the finished product conveying pipe (2) 2 to the center of the cylinder through the outer wall of the finished product conveying pipe (2) and the upper component inside the cylinder (1) of the steam rotary kiln. The discharge hood (3) is located at the tail of the steam rotary kiln cylinder (1) and covers the finished product discharge port and the return material outlet (103) of the cylinder. The steam rotary kiln cylinder (1) is provided with a cylinder partition ring plate (106). The cylinder partition ring plate (106) and the discharge hood partition plate provided with the discharge hood (3) are combined to form independent channels for finished products and return materials.

2. The two-stage discharge structure of the steam rotary furnace according to claim 1, characterized in that: The finished product conveying pipe (2) is concentrically arranged with the steam rotary furnace cylinder (1) and has sufficient radial distance from the innermost concentrically arranged steam heat exchanger pipe (102).

3. The two-stage discharge structure of the steam rotary furnace according to claim 1, characterized in that: The feed inlet of the finished product conveying component is located on the feed inlet side of the rotary kiln, and the feed inlet of the finished product conveying component is equipped with a lifting device. The discharge outlet of the finished product conveying component is located at the tail of the rotary kiln.

4. The two-stage discharge structure of the steam rotary kiln according to claim 3, characterized in that: The material lifting device is a material lifting hopper (201), and the length of the material lifting hopper (201) is adapted to any position from the outer wall of the finished product conveying pipe (2) to the inner wall of the steam rotary furnace cylinder (1).

5. The two-stage discharge structure of the steam rotary furnace according to claim 1, characterized in that: The steam rotary furnace cylinder (1) has an ash-blocking ring (105) inside the cylinder at the tail end and between the finished product outlet and the return material outlet. The ash-blocking ring (105) has a return material outlet on the cylinder near the front of the furnace head and a finished product outlet on the cylinder near the rear of the furnace tail.

6. The two-stage discharge structure of the steam rotary kiln according to claim 1, characterized in that: A cylinder partition ring plate (106) is provided on the outer wall of the cylinder corresponding to the ash-blocking ring (105) inside the cylinder.

7. The two-stage discharge structure of the steam rotary kiln according to claim 6, characterized in that: The outlet of the finished product conveying pipe (2) extends towards the tail of the furnace and passes through the ash-blocking ring (105) to communicate with the finished product discharge port of the furnace body.

8. The two-stage discharge structure of the steam rotary kiln according to claim 6, characterized in that: The discharge hood (3) is equipped with a discharge hood partition (301) inside. The discharge hood partition (301) is located on the rear side of the cylinder dividing ring plate (106) near the furnace tail, and there is a certain gap between the two.

9. The two-stage discharge structure of the steam rotary furnace according to claim 1, characterized in that: The finished product conveying pipe (2) is arranged axially along the steam rotary furnace cylinder (1) in the middle and rear part of the steam rotary furnace cylinder (1), and the length of the finished product conveying pipe (2) is less than that of the steam rotary furnace cylinder (1).

10. The two-stage discharge structure of the steam rotary kiln according to claim 1, characterized in that: A spiral belt (203) is installed inside the finished product conveying pipe (2).

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