A self-cement kiln hot raw meal nitration device

Abstract

This utility model relates to the field of flue gas desulfurization technology in cement kilns, specifically to a self-use cement kiln hot raw material nitrifier, including a conveying pipe, a water-cooled conveying assembly, a weighing device, a nitrification unit, a weighing screw conveyor, a storage bucket elevator, and a kiln bucket elevator. The water-cooled conveying assembly is located below the conveying pipe. This assembly is used to crush and cool the hot raw material before conveying it to the weighing device for weighing. The weighing device is installed on one side of the water-cooled conveying assembly and is used to weigh the hot raw material. Based on the weight of the hot raw material, the water supply device of the nitrification unit is used for water supply and nitrification. The nitrification unit is installed below the weighing device and is used for nitrifying the hot raw material. The weighing screw conveyor is installed below the nitrification unit and is used to weigh and convey the nitrated material. The weighing screw conveyor is equipped with a storage bucket elevator and a kiln bucket elevator.

Description

Technical Field

[0001] This utility model relates to the field of desulfurization technology for cement kiln flue gas, specifically to a self-use cement kiln hot raw material nitrifier. Background Technology

[0002] Cement kiln production generates a large amount of sulfur-containing flue gas. Traditional desulfurization methods typically require the addition of limestone or calcium hydroxide, which not only increases operating costs but may also cause secondary pollution. Although some technologies utilize the cement kiln's own system for desulfurization, they generally suffer from low desulfurization efficiency and unreasonable system design, making it difficult to achieve efficient and stable desulfurization results. Existing technologies are also unsuitable for the high temperatures of cement raw materials, and generally rely on purchased quicklime for nitrification treatment, which is relatively costly.

[0003] Therefore, the present invention provides a self-use cement kiln hot raw material nitrifier to solve the above problems. Utility Model Content

[0004] The technical problem this invention aims to solve is as follows: Cement kiln production generates a large amount of sulfur-containing flue gas. Traditional desulfurization methods typically require the addition of limestone or calcium hydroxide, which not only increases operating costs but may also cause secondary pollution. Although some technologies utilize the cement kiln's own system for desulfurization, they generally suffer from low desulfurization efficiency and unreasonable system design, making it difficult to achieve efficient and stable desulfurization. Furthermore, existing technologies are unsuitable for the high temperatures of hot cement raw materials, and generally rely on purchased quicklime for nitrification, resulting in relatively high costs.

[0005] This utility model provides the following technical solution: a self-use cement kiln hot raw material nitrifier, including a conveying pipe, a water-cooled conveying assembly, a weighing device, a nitrification unit, a weighing screw conveyor, a storage bucket elevator, and a kiln bucket elevator. The water-cooled conveying assembly is installed below the conveying pipe. This assembly is used to crush and cool the hot raw material before conveying it to the weighing device for weighing. The weighing device is installed on one side of the water-cooled conveying assembly and is used to weigh the hot raw material. Based on the weight of the hot raw material, the water supply device of the nitrification unit is used for water supply and nitrification. The nitrification unit is installed below the weighing device and is used for nitrifying the hot raw material. The weighing screw conveyor is installed below the nitrification unit and is used to weigh and convey the nitrated material. The weighing screw conveyor is equipped with a storage bucket elevator and a kiln bucket elevator.

[0006] Preferably, the water-cooled conveying assembly includes a water-cooled conveying motor, a conveying pipe, a first feed inlet, a first discharge outlet, a first rotating rod, a first spiral fan blade, a water-cooled chamber, a water pump, and a water outlet. The water-cooled conveying motor is installed below the conveying pipe, and the conveying pipe is installed on one side of the water-cooled conveying motor. The conveying pipe has a first feed inlet and a first discharge outlet. A first rotating rod is provided at the output end of the water-cooled conveying motor, and a first spiral fan blade is provided on the first rotating rod. A water-cooled chamber is provided inside the conveying pipe, and a water pump is installed at one end of the water-cooled chamber, and a water outlet is provided at the other end of the water-cooled chamber.

[0007] Preferably, an airlock valve is provided between the material conveying pipe and the water-cooled conveying assembly.

[0008] Preferably, the weighing device includes a fixed chamber, a weighing chamber, a telescopic rod, a return spring, a tension spring, a tension sensor, a feed pipe, and a conveying port. The fixed chamber is installed below the water-cooled conveying assembly. The weighing chamber is disposed inside the fixed chamber. A telescopic rod is disposed at the bottom of the weighing chamber and the fixed chamber. A return spring is installed on the telescopic rod. A tension spring is disposed above the weighing chamber and the fixed chamber. A tension sensor is disposed on the tension spring. A feed pipe is disposed above the fixed chamber and the weighing chamber. A conveying port is disposed at the bottom of the telescopic rod.

[0009] Preferably, the feed tube is made of a retractable threaded tube material.

[0010] The beneficial effects of this utility model are as follows: 1. This utility model uses an airlock valve to block the backflow of high-temperature flue gas inside the kiln, maintaining negative pressure in the system and protecting downstream equipment; the water-cooled conveying assembly simultaneously crushes the hot raw materials during the screw conveying process and rapidly cools them with circulating cooling water, reducing the difficulty and energy consumption of subsequent processing; the weighing device uses a tension sensor with elastic suspension to perform real-time measurement of the symmetrical weighing bin, combined with a retractable threaded feed pipe to compensate for displacement, ensuring both sealing and avoiding interference, thereby accurately controlling the three-stage water supply of the nitration unit, achieving dynamic matching between water volume and raw material weight, thus significantly improving the system's automation level, reaction stability, resource utilization rate, and overall operational reliability. Attached Figure Description

[0011] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the overall design of this utility model; Figure 2 This is a schematic diagram of the water-cooled conveying assembly of this utility model; Figure 3 This is a schematic diagram of the weighing device of this utility model.

[0013] In the diagram: 1. Feed pipe; 2. Water-cooled conveying assembly; 21. Water-cooled conveying motor; 22. Conveying pipe; 23. Feed inlet No. 1; 24. Discharge outlet No. 1; 25. Rotating rod No. 1; 26. Spiral fan blade No. 1; 27. Water-cooled chamber; 28. Water pump; 29. ​​Water outlet; 3. Weighing device; 31. Fixed chamber; 32. Weighing chamber; 33. Telescopic rod; 34. Return spring; 35. Tension spring; 36. Tension sensor; 37. Feed pipe; 38. Conveying port; 4. Nitrification unit; 5. Weighing screw conveyor; 6. Storage bucket elevator; 7. Kiln bucket elevator; 8. Airlock valve. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely represents some embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0015] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0016] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and "back side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is conventionally placed during use. These terms are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0017] It should also be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0018] This disclosure aims to address the issue that cement kiln production generates large amounts of sulfur-containing flue gas. Traditional desulfurization methods typically require the addition of limestone or calcium hydroxide, which not only increases operating costs but may also cause secondary pollution. Although some technologies utilize the cement kiln's own system for desulfurization, they generally suffer from low desulfurization efficiency and unreasonable system design, making it difficult to achieve efficient and stable desulfurization results. Furthermore, existing technologies are unsuitable for the high temperatures of hot cement raw materials, primarily relying on purchased quicklime for nitration treatment, which results in relatively high costs. In view of this, the present disclosure proposes a self-use cement kiln hot raw material nitrifier. It uses an airlock valve to prevent backflow of high-temperature flue gas into the kiln, maintaining negative pressure in the system and protecting downstream equipment. The water-cooled conveying assembly simultaneously crushes the hot raw material during screw conveying and rapidly cools it with circulating cooling water, reducing the difficulty and energy consumption of subsequent processing. The weighing device uses a tension sensor with elastic suspension for real-time measurement of the symmetrical weighing chamber, combined with a retractable threaded feed pipe to compensate for displacement, ensuring both sealing and avoiding interference. Based on this, it precisely controls the three-stage water supply to the nitrification unit, achieving dynamic matching between water volume and raw material weight, thereby significantly improving the system's automation level, reaction stability, resource utilization, and overall operational reliability.

[0019] like Figures 1 to 3 As shown, a self-use cement kiln hot raw material nitrifier includes a conveying pipe 1, a water-cooled conveying assembly 2, a weighing device 3, a nitrification unit 4, a weighing screw conveyor 5, an inlet bucket elevator 6, and an inlet bucket elevator 7. The water-cooled conveying assembly 2 is located below the conveying pipe 1. This assembly is used to crush and cool the hot raw material before conveying it to the weighing device 3 for weighing. The weighing device 3 is installed on one side of the water-cooled conveying assembly 2 and is used to weigh the hot raw material. Based on the weight of the hot raw material, water is supplied to the nitrification unit 4 for nitrification. The nitrification unit 4 is installed below the weighing device 3 and is used for nitrifying the hot raw material. The weighing screw conveyor 5 is installed below the nitrification unit 4 and is used to weigh and convey the nitrated material. The weighing screw conveyor 5 is equipped with an inlet bucket elevator 6 and an inlet bucket elevator 7. The airlock valve 8 blocks the backflow of high-temperature flue gas inside the kiln, maintaining negative pressure in the system and protecting downstream equipment. The water-cooled conveying assembly 2 simultaneously crushes the hot raw material during the screw conveying process and rapidly cools it down with circulating cooling water, reducing the difficulty and energy consumption of subsequent processing. The weighing device 3 uses the tension sensor 36 with elastic suspension to perform real-time measurement on the symmetrical weighing bin 32. Combined with the retractable threaded feed pipe 37 to compensate for displacement, it ensures both sealing and avoids interference. Based on this, it accurately controls the three-stage water supply of the nitration unit 4, achieving dynamic matching between water volume and raw material weight, thereby significantly improving the system's automation level, reaction stability, resource utilization, and overall operational reliability.

[0020] like Figures 1 to 2 As shown, the water-cooled conveying assembly 2 includes a water-cooled conveying motor 21, a conveying pipe 22, a first feed inlet 23, a first discharge outlet 24, a first rotating rod 25, a first spiral fan blade 26, a water-cooled chamber 27, a water pump 28, and a water outlet 29. The water-cooled conveying motor 21 is installed below the conveying pipe 1 and is used to power the first rotating rod 25 to rotate. A conveying pipe 22 is installed on one side of the water-cooled conveying motor 21 for conveying hot raw materials. The conveying pipe 22 has a first feed inlet 23 and a first discharge outlet 24. The first feed inlet 23 is used for feeding materials, and the first discharge outlet 24 is used for discharging materials. The water-cooled... The output end of the conveyor motor 21 is equipped with a first rotating rod 25, which is used to rotate and crush the hot raw material while conveying it forward. A first spiral fan blade 26 is mounted on the first rotating rod 25, which is used to assist in conveying the hot raw material. A water-cooling chamber 27 is installed inside the conveying pipe 22, which is used to cool the hot raw material. A water pump 28 is installed at one end of the water-cooling chamber 27, which is used to deliver cooling water to the water-cooling chamber 27 for cooling. An outlet 29 is provided at the other end of the water-cooling chamber 27, which is used to discharge the cooled water after heat exchange. During operation, hot raw materials enter the conveying pipe 22 through the first feed port 23. At this time, the water-cooled conveying motor 21 drives the first rotating rod 25 to rotate. The rotating rod 25 drives the first spiral fan blade 26 to rotate. The rotating spiral fan blade 26 crushes and conveys the hot raw materials, causing them to flow out from the first discharge port 24. At the same time, the water pump 28 pumps cooling water to the water-cooling chamber 27 to exchange heat with the hot raw materials in the conveying pipe 22, thereby cooling the hot raw materials. The cooling water after heat exchange is discharged from the outlet 29. The cold conveying assembly integrates screw conveying, crushing, and cooling functions into one unit, achieving online continuous crushing and efficient cooling of high-temperature raw materials. On one hand, the water-cooled conveyor motor 21 drives the screw blades to simultaneously crush the hot raw materials during conveying, reducing the difficulty of subsequent processing. On the other hand, cooling water circulates in the water-cooling chamber 27 via the water pump 28 and directly exchanges heat with the hot raw materials, quickly removing heat and ensuring controllable discharge temperature, avoiding the impact of high temperature on downstream equipment. The overall structure is compact and energy-efficient, improving the pretreatment efficiency of hot raw materials and enhancing the continuity and safety of system operation, effectively supporting the stable progress of the nitration process.

[0021] like Figures 1 to 2 As shown, an airlock valve 8 is installed between the material conveying pipe 1 and the water-cooled conveying assembly 2. The airlock valve 8 can effectively block the backflow of high-temperature flue gas in the kiln through the water-cooled spiral channel, which can prevent hot air and dust from overflowing and causing energy loss and environmental pollution, and also prevent the high-temperature airflow from directly impacting the downstream weighing and nitration unit 4, ensuring equipment safety, metering accuracy and process stability, while maintaining the negative pressure condition of the system and improving the overall operational reliability.

[0022] like Figures 1 to 3 As shown, the weighing device 3 includes a fixed chamber 31, a weighing chamber 32, a telescopic rod 33, a return spring 34, a tension spring 35, a tension sensor 36, a feed pipe 37, and a conveying port 38. The fixed chamber 31 is installed below the water-cooled conveying assembly 2. The weighing chamber 32 is arranged inside the fixed chamber 31. The telescopic rod 33 is arranged at the bottom of the fixed chamber 31. The return spring 34 is installed on the telescopic rod 33. The tension spring 35 is arranged above the weighing chamber 32 and the fixed chamber 31. The tension sensor 36 is arranged on the tension spring 35. The feed pipe 37 is arranged above the fixed chamber 31 and the weighing chamber 32. The conveying port 38 is arranged at the bottom of the telescopic rod 33. During operation, hot raw material falls into the weighing bin from the first discharge port 24. Under the action of gravity, the weighing bin 32 moves downward and pulls the tension spring 35. In turn, the tension sensor 36 on the tension spring 35 determines the weight of the hot raw material in the weighing bin 32. The raw material in the weighing bin is crushed by the crushing valve and then enters the nitration unit 4. The water supply system provides water for three-stage nitration, and the water volume is dynamically adjusted according to the discharge situation of the weighing bin. Through the elastic suspension structure of the fixed chamber 31 and the weighing chamber 32, the weight of the hot raw material is sensed in real time using the tension spring 35 and the high-precision tension sensor 36, achieving dynamic and continuous online metering. Combined with the self-resetting design of the telescopic rod 33 and the return spring 34, the weighing chamber 32 can be flexibly raised and lowered according to changes in the amount of material, ensuring weighing stability and avoiding jamming. Based on the real-time weight signal, the water supply system can accurately adjust the amount of water required for the three-stage nitrification, preventing energy waste due to excessive water use and incomplete reaction due to insufficient water. Thus, while ensuring the efficient and stable nitrification reaction, the system's automation level and resource utilization rate are significantly improved.

[0023] like Figures 1 to 3 As shown, the feed pipe 37 is made of a retractable threaded tube. Designing the feed pipe 37 as a retractable threaded tube allows it to maintain a flexible connection as the weighing chamber 32 floats up and down with weight changes. This avoids the defects of rigid pipes, such as easy tearing and leakage, and improves sealing to prevent dust spillage. Simultaneously, the threaded structure provides a certain degree of self-support and negative pressure resistance, reducing the need for additional support components, making installation and maintenance more convenient, and overall improving weighing accuracy and system reliability. The overall working process is as follows: Hot raw material enters the conveying pipe 22 through the first feed inlet 23. At this time, the water-cooled conveying motor 21 drives the first rotating rod 25 to rotate. The rotating rod 25 drives the first spiral fan blade 26 to rotate. The rotating spiral fan blade 26 crushes and conveys the hot raw material, causing it to flow out from the first discharge outlet 24. At the same time, the water pump 28 pumps cooling water to the water-cooling chamber 27 to exchange heat with the hot raw material in the conveying pipe 22, thereby cooling the hot raw material. The cooled water after heat exchange is discharged from the outlet. 29 is discharged, and the hot raw material falls into the weighing bin from the first discharge port 24. Under the action of gravity, the weighing bin 32 moves downward and pulls the tension spring 35. Then, in conjunction with the tension sensor 36 on the tension spring 35, the weight of the hot raw material in the weighing bin 32 is determined. The raw material in the weighing bin is crushed by the crushing valve and enters the nitration unit 4. The water supply system performs three-stage nitration, and the water volume is dynamically adjusted according to the discharge of the weighing bin. After nitration, the raw material is transported to the storage bucket elevator 6 and the kiln bucket elevator 7 by the load-bearing screw conveyor.

[0024] 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 claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A self-use cement kiln hot raw material nitrifier, characterized in that, The system includes a conveying pipe (1), a water-cooled conveying assembly (2), a weighing device (3), a nitration unit (4), a weighing screw conveyor (5), a storage bucket elevator (6), and a kiln bucket elevator (7). The water-cooled conveying assembly (2) is installed below the conveying pipe (1). The water-cooled conveying assembly (2) is used to crush and cool the hot raw materials before conveying them to the weighing device (3) for weighing. The weighing device (3) is installed on one side of the water-cooled conveying assembly (2) and is used to weigh the hot raw materials entering the kiln. Weighing is performed, and then water is supplied for nitration according to the weight of the hot raw material in conjunction with the water supply device of the nitration unit (4); the nitration unit (4) is installed below the weighing device (3), and the nitration unit (4) is used to nitrate the hot raw material; the weighing screw conveyor (5) is installed below the nitration unit (4), and the weighing screw conveyor (5) is used to weigh and transport the nitrated material, and the weighing screw conveyor (5) is equipped with a storage bucket elevator (6) and a kiln bucket elevator (7).

2. The self-use cement kiln hot raw material nitrifier according to claim 1, characterized in that: The water-cooled conveying assembly (2) includes a water-cooled conveying motor (21), a conveying pipe (22), a first feed inlet (23), a first discharge outlet (24), a first rotating rod (25), a first spiral fan blade (26), a water-cooled chamber (27), a water pump (28), and a water outlet (29). The water-cooled conveying motor (21) is installed below the conveying pipe (1). The conveying pipe (22) is installed on one side of the water-cooled conveying motor (21). The first feed inlet (23) and the first discharge outlet (24) are opened on the conveying pipe (22). The first rotating rod (25) is provided at the output end of the water-cooled conveying motor (21). The first spiral fan blade (26) is provided on the first rotating rod (25). The water-cooled chamber (27) is provided inside the conveying pipe (22). The water pump (28) is installed at one end of the water-cooled chamber (27), and the water outlet (29) is provided at the other end of the water-cooled chamber (27).

3. A self-use cement kiln hot raw material nitrifier according to claim 2, characterized in that: An airlock valve (8) is provided between the material conveying pipe (1) and the water-cooled conveying assembly (2).

4. A self-use cement kiln hot raw material nitrifier according to claim 3, characterized in that: The weighing device (3) includes a fixed chamber (31), a weighing chamber (32), a telescopic rod (33), a reset spring (34), a tension spring (35), a tension sensor (36), a feed pipe (37), and a discharge port. The fixed chamber (31) is installed below the water-cooled conveying assembly (2). The weighing chamber (32) is provided inside the fixed chamber (31). The telescopic rod (33) is provided at the bottom of the fixed chamber (31) of the weighing chamber (32). The reset spring (34) is installed on the telescopic rod (33). The tension spring (35) is provided above the weighing chamber (32) and the fixed chamber (31). The tension sensor (36) is provided on the tension spring (35). The feed pipe (37) is provided above the fixed chamber (31) and the weighing chamber (32). The discharge port is provided at the bottom of the telescopic rod (33).

5. A self-use cement kiln hot raw material nitrifier according to claim 4, characterized in that: The feed tube (37) is made of a retractable threaded tube material.

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