Combined waste heat utilization cooling kiln system

Abstract

The utility model discloses a combined type waste heat utilization cooling kiln system, including cooling kiln cylinder, cooling kiln cylinder front end sets up the feeding cover, and the rear end sets up the discharge cover, and the cooling kiln cylinder is divided into high temperature section cylinder, low temperature section cylinder from front to back, and the high temperature section cylinder inner wall sets up high temperature section heat exchange pipe group, and high temperature section heat exchange pipe group connects the water inlet main respectively, and the water return main, and the water inlet main connects the steam generator water inlet, and the water return main connects the steam generator water outlet, and the low temperature section cylinder outside sets up the outside shower system, and the discharge cover sets up the cooling air inlet, and the cooling air inlet connects the secondary fan, and the feeding cover sets up the hot air outlet, and the hot air outlet connects the rotary kiln. The combined type waste heat utilization cooling kiln system has solved the low heat exchange efficiency of current cooling kiln, and the problem that material waste heat has not been effectively utilized.

Description

Technical Field

[0001] This utility model relates to cooling kilns, and more particularly to a combined waste heat utilization cooling kiln system. Background Technology

[0002] After being roasted in a rotary kiln, the material enters a cooling kiln for cooling. Conventional cooling kilns use external water spraying, which has problems such as low heat exchange efficiency and ineffective utilization of waste heat from the material. Summary of the Invention

[0003] Purpose of the utility model: This utility model provides a combined waste heat utilization cooling kiln system, which combines internal heat exchange tube cooling and external water spray cooling to solve the problems of low heat exchange efficiency and ineffective utilization of material waste heat in current cooling kilns.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A combined waste heat recovery cooling kiln system includes a cooling kiln shell, a feed hood at the front end and a discharge hood at the rear end. The cooling kiln shell is divided into a high-temperature section and a low-temperature section from front to back. A high-temperature section heat exchange tube assembly is installed on the inner wall of the high-temperature section shell. The high-temperature section heat exchange tube assembly is connected to a main inlet water pipe and a main return water pipe. The main inlet water pipe is connected to the outlet of a steam generator, and the main return water pipe is connected to the inlet of a steam generator. An external water spray system is installed on the outer side of the low-temperature section shell. The discharge hood is provided with a cooling air inlet connected to a secondary air fan, and the feed hood is provided with a hot air outlet connected to a rotary kiln.

[0006] Furthermore, the high-temperature section heat exchange tube assembly includes multiple high-temperature section heat exchange tubes evenly distributed along the circumferential direction of the inner wall of the high-temperature section cylinder, with each high-temperature section heat exchange tube arranged along the length direction of the high-temperature section cylinder.

[0007] Furthermore, the outer wall of the high-temperature section heat exchange tube is provided with heat-conducting fins.

[0008] Furthermore, the plurality of high-temperature section heat exchange tubes are divided into at least two groups along the circumferential direction of the inner wall of the high-temperature section cylinder, and the adjacent high-temperature section heat exchange tubes in each group are connected end to end to form a serpentine loop structure.

[0009] Furthermore, the main inlet pipe and the main return pipe are installed inside the low-temperature section cylinder. The front end of the main inlet pipe extends to the high-temperature section cylinder and is connected to the inlet end of the serpentine loop structure formed by the heat exchange single tubes of each high-temperature section through the inlet branch pipes. The rear end of the main inlet pipe extends to the discharge hood. The front end of the main return pipe extends to the high-temperature section cylinder and is connected to the outlet end of the serpentine loop structure formed by the heat exchange single tubes of each high-temperature section through the return branch pipes. The rear end of the main return pipe extends to the discharge hood. A rotary joint is installed in the discharge hood. The inlet of the rotary joint is connected to the rear end of the main inlet pipe and the outlet of the steam generator, respectively. The return pipe of the rotary joint is connected to the rear end of the main return pipe and the inlet of the steam generator, respectively.

[0010] Furthermore, a steam system water supply pipeline is provided between the water inlet of the rotary joint and the water outlet of the steam generator.

[0011] Furthermore, the feed hood and the inner wall of the front end of the high-temperature section cylinder are both provided with a wear-resistant protective layer, and the outer wall of the high-temperature section cylinder is provided with a heat insulation layer.

[0012] Furthermore, the inner wall of the low-temperature section cylinder is equipped with a lifting plate, and the outer wall is equipped with a steel strip.

[0013] Furthermore, the external water spray system includes a spray pipe, a water collection hood, and a cooling tower. The spray pipe is located at the upper part of the low-temperature section cylinder, and the water collection hood is located at the lower part of the low-temperature section cylinder. The water collection hood is connected to the cooling tower return water inlet through a circulating pump, and the cooling tower outlet is connected to the spray pipe.

[0014] Furthermore, an external water supply system is installed between the cooling tower outlet and the spray pipe.

[0015] Beneficial Effects: This combined waste heat recovery cooling kiln system utilizes internal heat exchange tubes for cooling in the high-temperature section and conventional external water spray cooling in the low-temperature section. The heat exchange tubes at the high-temperature end convert the heat from the material in the high-temperature section into hot water or steam, which is then further cooled by the external water spray to meet discharge requirements. Simultaneously, secondary air is introduced to directly return a portion of the heat to the system. Through these methods, while meeting cooling requirements, the system maximizes the recovery of material heat, achieving energy conservation and emission reduction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a combined waste heat utilization cooling kiln system.

[0017] Figure 2 This is a schematic diagram of a group of single tubes for heat exchange in the high-temperature section.

[0018] Figure 3 This is a schematic diagram of the water inlet branch pipe.

[0019] Figure 4 This is a schematic diagram of the return water branch pipe.

[0020] In the diagram: 1-Feed hood; 2-Cooling kiln shell; 3-High-temperature section heat exchange tube assembly; 3-1-High-temperature section heat exchange single tube; 3-2-Serpentine loop structure; 4-Spray pipe; 5-Discharge hood; 6-Rotary joint; 7-Circulating water pipe; 8-Steam generator; 9-Secondary air fan; 10-Main water inlet pipe; 11-Main water return pipe; 12-Branch water inlet pipe; 13-Branch water return pipe; 14-Steam system makeup water pipeline; 15-Water collection hood; 16-Cooling tower; 17-External water spray system makeup pipeline. Detailed Implementation

[0021] The present invention will be further explained below with reference to the accompanying drawings.

[0022] like Figure 1 and 2 As shown, the present invention discloses a combined waste heat utilization cooling kiln system, including a cooling kiln body 2, a feed hood 1 at the front end of the cooling kiln body 2, and a discharge hood 5 at the rear end. The cooling kiln body 2 is divided into a high-temperature section and a low-temperature section from front to back. A high-temperature section heat exchange tube group 3 is installed on the inner wall of the high-temperature section. The high-temperature section heat exchange tube group 3 is connected to the inlet water main pipe 10 and the return water main pipe 11 respectively. The inlet water main pipe 10 is connected to the outlet of the steam generator 8, and the return water main pipe 11 is connected to the inlet of the steam generator 8.

[0023] like Figures 2 to 4 As shown, the high-temperature section heat exchange tube group 3 includes multiple high-temperature section heat exchange tubes 3-1 evenly distributed along the circumferential direction of the inner wall of the high-temperature section cylinder. Each high-temperature section heat exchange tube 3-1 is arranged along the length of the high-temperature section cylinder. The outer wall of each high-temperature section heat exchange tube is provided with heat-conducting fins to improve heat exchange efficiency. The surface of the heat-conducting fins is coated with a wear-resistant coating to improve their service life. Preferably, the multiple high-temperature section heat exchange tubes are divided into at least two groups along the circumferential direction of the inner wall of the high-temperature section cylinder. Adjacent high-temperature section heat exchange tubes in each group are connected end-to-end, forming a serpentine loop structure. Each group of high-temperature section heat exchange tubes is fixed to the rotary kiln cylinder at the feed end, and the other end is connected to the cylinder through a slot. The heat exchange tubes and the cylinder can slide axially, avoiding damage to the equipment due to different thermal expansion and contraction lengths caused by different temperatures.

[0024] In this embodiment, the high-temperature section heat exchange tubes are divided into three groups along the circumferential direction of the inner wall of the high-temperature section cylinder. The adjacent high-temperature section heat exchange tubes in the three groups are connected end to end, thus forming three serpentine loop structures.

[0025] The main inlet pipe 10 and the main return pipe 11 are installed inside the low-temperature section cylinder. The front end of the main inlet pipe extends to the high-temperature section cylinder and is connected to the inlet end of the serpentine loop structure composed of three sets of high-temperature section heat exchange single pipes through the inlet branch pipe 12. The rear end of the main inlet pipe 10 extends to the discharge hood 5. The front end of the main return pipe 11 extends to the high-temperature section cylinder and is connected to the outlet end of the serpentine loop structure composed of three sets of high-temperature section heat exchange single pipes through the return branch pipe 13. The rear end of the main return pipe 11 extends to the discharge hood 5. A rotary joint 6 is installed in the discharge hood 5. The rotary joint 6 has an inlet pipe and a return pipe. The inlet pipe of the rotary joint 6 is connected to the rear end of the main inlet pipe 10 and the outlet of the steam generator 8, respectively. The return pipe of the rotary joint 6 is connected to the rear end of the main return pipe 11 and the inlet of the steam generator 8, respectively. The rotary joint 6 is connected to the steam generator 8 via a circulating water pipe 7, as is the rotary joint 6 via a return water pipe 7. Additionally, a steam system makeup water pipe 14 is installed between the rotary joint 6 and the steam generator 8 to supply cooling water to the high-temperature heat exchange tube assembly.

[0026] To ensure the service life of the equipment, the feed hood and the inner wall of the front end of the high-temperature section cylinder are both equipped with a wear-resistant protective layer. The wear-resistant protective layer is made of wear-resistant castable material, and it is also installed on the outer wall of the high-temperature section cylinder to reduce heat loss.

[0027] like Figure 1 As shown, an external water spray system is installed on the outside of the low-temperature section cylinder. The external water spray system includes spray pipes 4, a water collection hood 5, and a cooling tower 16. Spray pipes 4 are located at the upper part of the low-temperature section cylinder, and the water collection hood 5 is located at the lower part of the low-temperature section cylinder. The water collection hood is connected to the return water inlet of the cooling tower 16 via a circulating pump, and the outlet of the cooling tower 16 is connected to the spray pipes. An external water spray system makeup water pipe 17 is installed between the outlet of the cooling tower 16 and the spray pipes 4. This is used to replenish cooling water to the external water spray system.

[0028] The inner wall of the low-temperature section cylinder is equipped with lifting plates to accelerate the uniform distribution of materials on the inner wall of the low-temperature section cylinder and ensure good contact with them. The outer wall is equipped with steel strips, which have good thermal conductivity and can improve the heat exchange efficiency between the external water spray and the materials.

[0029] like Figure 1 As shown, the discharge hood 5 is equipped with a cooling air inlet, which is connected to the secondary air fan 9. The feed hood 1 is equipped with a hot air outlet, which is connected to the rotary kiln (not shown in the figure).

[0030] During operation, the high-temperature section of the cooling kiln shell 2 is cooled using heat exchange tubes. Circulating water exchanges heat with the material inside the high-temperature section via the high-temperature section heat exchange tube assembly 3, raising its temperature to approximately 170°C. It then enters the steam generator 8 via the rotary joint 6. As the pressure inside the steam generator 8 decreases, vaporization occurs, absorbing heat. The steam is then discharged through the external steam pipe. The remaining circulating water, after its temperature decreases, is pressurized by the circulating pump along with makeup water and re-enters the high-temperature section heat exchange tube assembly 3 to exchange heat with the material, completing the cycle. The low-temperature section of the cooling kiln shell 2 is cooled using external water spraying. This external water exchanges heat with the material inside the low-temperature section. After being collected by the external water collection hood, the external water is pumped to the cooling tower for further cooling before exchanging heat with the kiln shell again, completing the cycle. A secondary air fan 9 is installed at the discharge hood, sending natural air into the cooling kiln shell 2. This air exchanges heat with the material inside the kiln shell. The heated secondary air then enters the front end of the rotary kiln via the feed hood to participate in combustion, carrying heat back into the system.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A combined waste heat recovery cooling kiln system, comprising a cooling kiln shell, a feed hood at the front end of the cooling kiln shell, and a discharge hood at the rear end, characterized in that: The cooling kiln shell is divided into a high-temperature section and a low-temperature section from front to back. The inner wall of the high-temperature section shell is equipped with a high-temperature heat exchange tube assembly, which is connected to the inlet water main and the return water main. The inlet water main is connected to the outlet of the steam generator, and the return water main is connected to the inlet of the steam generator. An external water spray system is installed on the outside of the low-temperature section shell. The discharge hood is equipped with a cooling air inlet, which is connected to a secondary air fan. The feed hood is equipped with a hot air outlet, which is connected to the rotary kiln.

2. The combined waste heat utilization cooling kiln system according to claim 1, characterized in that: The high-temperature section heat exchange tube assembly includes multiple high-temperature section heat exchange tubes evenly distributed along the circumferential direction of the inner wall of the high-temperature section cylinder, with each high-temperature section heat exchange tube arranged along the length of the high-temperature section cylinder.

3. The combined waste heat utilization cooling kiln system according to claim 2, characterized in that: The outer wall of the heat exchange tube in the high-temperature section is provided with heat-conducting fins.

4. The combined waste heat utilization cooling kiln system according to claim 2, characterized in that: The multiple high-temperature section heat exchange tubes are divided into at least two groups along the circumferential direction of the inner wall of the high-temperature section cylinder. The adjacent high-temperature section heat exchange tubes in each group are connected end to end, forming a serpentine loop structure.

5. The combined waste heat utilization cooling kiln system according to claim 4, characterized in that: The main inlet pipe and the main return pipe are located inside the low-temperature section cylinder. The front end of the main inlet pipe extends to the high-temperature section cylinder and is connected to the inlet end of the serpentine loop structure formed by the heat exchange single tubes of each high-temperature section through the inlet branch pipes. The rear end of the main inlet pipe extends to the discharge hood. The front end of the main return pipe extends to the high-temperature section cylinder and is connected to the outlet end of the serpentine loop structure formed by the heat exchange single tubes of each high-temperature section through the return branch pipes. The rear end of the main return pipe extends to the discharge hood. A rotary joint is installed in the discharge hood. The inlet of the rotary joint is connected to the rear end of the main inlet pipe and the outlet of the steam generator. The return pipe of the rotary joint is connected to the rear end of the main return pipe and the inlet of the steam generator.

6. A combined waste heat utilization cooling kiln system according to claim 5, characterized in that: A steam system water supply pipeline is installed between the water inlet of the rotary joint and the water outlet of the steam generator.

7. The combined waste heat utilization cooling kiln system according to claim 1, characterized in that: The feed hood and the inner wall of the front end of the high-temperature section cylinder are both provided with a wear-resistant protective layer, and the outer wall of the high-temperature section cylinder is provided with a heat insulation layer.

8. A combined waste heat utilization cooling kiln system according to claim 1, characterized in that: The inner wall of the low-temperature section cylinder is equipped with a lifting plate, and the outer wall is equipped with a steel belt.

9. A combined waste heat recovery cooling kiln system according to claim 1, characterized in that: The external water spray system includes a spray pipe, a water collection hood, and a cooling tower. The spray pipe is located on the upper part of the low-temperature section cylinder, and the water collection hood is located on the lower part of the low-temperature section cylinder. The water collection hood is connected to the return water port of the cooling tower through a circulating pump, and the outlet of the cooling tower is connected to the spray pipe.

10. A combined waste heat recovery cooling kiln system according to claim 9, characterized in that: An external water supply pipeline is installed between the cooling tower outlet and the spray pipe.

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