Novel high-capacity low-resistance 16-push-head vertical preheater of rotary kiln

Abstract

The utility model discloses a novel high-capacity low-resistance 16-push-head vertical preheater of a rotary kiln, and relates to the technical field of vertical preheaters, the vertical preheater is applied to the rotary kiln, a kiln tail smoke chamber is arranged on the rotary kiln, the vertical preheater further comprises a preheating unit, the preheating unit comprises a preheating shell, the kiln tail smoke chamber is connected with an air inlet pipe, and the air inlet pipe is connected with an air outlet pipe. A preheating shell is connected to the gas inlet pipe, an annular channel is formed in the preheating shell, tail gas in the rotary kiln enters the annular channel through the kiln tail smoke chamber and the gas inlet pipe, and after limestone enters the annular channel, the limestone in the annular channel can be preheated through the tail gas in the rotary kiln. Therefore, no heat exchange dead zone exists in the heat exchange process of the limestone in the annular channel, the limestone is heated more uniformly, and the preheating effect of the limestone is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of vertical preheaters, specifically a novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns. Background Technology

[0002] As is generally known, a vertical preheater refers to a vertical preheating device used to preheat refractory raw materials. Vertical preheaters are characterized by high thermal efficiency and a high level of automation. The flue gas generated at the kiln tail is cooled by an air cooler and then enters a bag filter. The purified air is discharged into the atmosphere through a chimney by a fan. This results in the waste of high-temperature flue gas at the kiln tail and the inability to recover the heat carried out by the products at the kiln head, causing a huge waste of energy.

[0003] For example, the patent with announcement number CN216953124U, publication date July 12, 2022, and titled "A High-Efficiency Vertical Preheater," discloses a high-efficiency vertical preheater, relating to the field of preheater technology. This high-efficiency vertical preheater includes a preheating chamber, with air inlets and outlets fixedly installed on the front and rear sides of the chamber, both connected to the interior of the preheating chamber. A water tank is fixedly installed on the side surface of the preheating chamber, and a water pipe is fixedly installed on the top of the water tank. This high-efficiency vertical preheater features a hollow support rod that moves up and down. This movement causes a scraper to contact the surface of the heat-conducting metal sheet via the force of a torsion spring. As the hollow support rod moves up and down, the scraper removes water and impurities from the surface of the heat-conducting metal sheet, reducing impurities and improving the cleaning effect. This prevents water from drying out on the surface of the heat-conducting metal sheet, which would otherwise cause impurities to re-solidify.

[0004] The shortcoming of the existing technology is that the existing vertical preheater has a heat exchange dead zone during the heat exchange process, and the heat distribution is uneven, which in turn causes the limestone exiting the preheating chamber to be preheated unevenly, thus affecting the preheating effect of the limestone. Summary of the Invention

[0005] The purpose of this invention is to provide a novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns, in order to solve the aforementioned problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns, applied to a rotary kiln, wherein the rotary kiln is provided with a kiln tail smoke chamber, including a preheating unit, the preheating unit including a preheating shell, the kiln tail smoke chamber being connected to an air inlet pipe, the air inlet pipe being connected to the preheating shell, and an annular channel being provided inside the preheating shell.

[0007] As mentioned above, a preheater hopper is provided at the top of the preheating shell.

[0008] As described above, the annular channel is divided into multiple preheating spaces, and each preheating space is connected to a preheater feeding pipe at its top.

[0009] The aforementioned preheater feed pipes are connected by the same annular pipe body.

[0010] As mentioned above, the top of the preheating housing is provided with heat sinks.

[0011] As mentioned above, the air outlet of the preheating shell is connected to a long bag low-pressure dust collector through an air outlet pipe.

[0012] As mentioned above, the exhaust port of the long bag low-pressure dust collector is connected to a high-temperature fan.

[0013] As mentioned above, a cold air valve is provided on the air outlet pipe.

[0014] As mentioned above, the long bag low-pressure dust collector is connected to a conveying pump.

[0015] As described above, the long bag low-pressure dust collector is connected to a secondary circulation fan via a pipe, and the secondary circulation fan is connected to the preheater silo.

[0016] The beneficial effects of this utility model are as follows: the exhaust gas in the rotary kiln enters the annular channel through the kiln tail smoke chamber and the air inlet pipe. After the limestone enters the annular channel, the limestone in the annular channel can be preheated by the exhaust gas in the rotary kiln. This ensures that there is no heat exchange dead zone in the process of heat exchange of the limestone in the annular channel, making the heating of the limestone more uniform and improving the preheating effect of the limestone. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a partial three-dimensional structural schematic diagram of the present invention;

[0019] Figure 2 This is a process flow diagram of limestone preheating according to the present invention;

[0020] Figure 3 This is a schematic diagram of the heat exchange of a ≤600T / D preheater, which is a prior art technology of this utility model;

[0021] Figure 4A schematic diagram of the heat exchange of the 800T-1000T / D imported preheater, which is the prior art of this utility model;

[0022] Figure 5 A schematic diagram of the heat exchange process of the vertical preheater provided by this utility model;

[0023] Figure 6 This is a partial structural schematic diagram of the preheating shell of this utility model from a top view.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Rotary kiln; 2. Preheating shell; 3. Air inlet pipe; 4. Annular channel; 5. Preheater hopper; 6. Preheating space; 7. Preheater feed pipe; 8. Annular tube; 9. Heat sink; 10. Heat exchange dead zone; 11. Limestone. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0027] like Figures 1 to 6 As shown in the figure, a novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns is provided in one embodiment of the present invention. It is applied to a rotary kiln 1. The rotary kiln 1 is provided with a kiln tail smoke chamber, which includes a preheating unit. The preheating unit includes a preheating shell 2. The kiln tail smoke chamber is connected to an air inlet pipe 3. The air inlet pipe 3 is connected to the preheating shell 2. An annular channel 4 for conveying limestone 11 is provided inside the preheating shell 2.

[0028] Specifically, the vertical preheater is used in conjunction with the rotary kiln 1. The preheating shell 2 is the carrier for loading limestone 11, and the annular channel 4 is an annular groove for conveying limestone 11. A preheater hopper 5 is provided at the top of the preheating shell 2. The annular channel 4 is divided into multiple preheating spaces 6, and each preheating space 6 is connected to a preheater feeding pipe 7 at its top. All preheater feeding pipes 7 are connected through the same annular pipe body 8. Heat dissipation fins 9 are provided at the top of the preheating shell 2. The limestone 11 is stored through the preheater hopper 5. When preheating of limestone 11 is required, the limestone 11 in the preheater hopper 5 is conveyed through the annular pipe body 8 to each preheater feeding pipe 7. Each preheater feeding pipe 7 conveys the limestone 11 into the annular channel 4 inside the preheating shell 2. Since the annular channel 4 divides multiple preheating spaces 6, the limestone 11 is preheated through the preheater feeding pipes 7. The conveying process ensures that each preheating space 6 is evenly filled with limestone 11. The exhaust gas from the rotary kiln 1 enters the annular channel 4 through the kiln tail smoke chamber and the air inlet pipe 3, so that the limestone 11 in each preheating space 6 is preheated to about 900°C by the kiln tail hot gas at 1000-1100°C. The limestone 11 slowly moves down in the annular channel 4. After the limestone 11 moves down from the annular channel 4, the preheated limestone 11 is collected. The exhaust gas in the annular channel 4 enters the kiln tail exhaust gas treatment system to clean the waste from the preheating of limestone 11. The limestone 11 is evenly separated by each preheating space 6, so that the limestone 11 is evenly preheated. This ensures that there is no heat exchange dead zone 10 during the heat exchange process of limestone 11 in the annular channel 4, making the heating of limestone 11 more uniform and improving the preheating effect of limestone 11.

[0029] The shortcoming of the existing technology is that the existing vertical preheater has a heat exchange dead zone 10 during the heat exchange process (such as...). Figure 3 and Figure 4 As shown in the figure, the uneven heat distribution leads to uneven preheating of limestone 11 exiting the preheating chamber, which in turn affects the preheating effect of limestone 11.

[0030] The beneficial effects of this embodiment are as follows: the exhaust gas in the rotary kiln 1 enters the annular channel 4 through the kiln tail smoke chamber and the air inlet pipe 3. After the limestone 11 enters the annular channel 4, the limestone 11 in the annular channel 4 can be preheated by the exhaust gas in the rotary kiln 1, so that there is no heat exchange dead zone 10 during the heat exchange process of the limestone 11 in the annular channel 4, and the heating of the limestone 11 is more uniform (e.g., Figure 5 As shown in the figure, it improves the preheating effect of limestone 11.

[0031] In another embodiment of this utility model, the air outlet of the preheating shell 2 is connected to a long bag low-pressure dust collector via an air outlet pipe; a high-temperature fan is connected to the smoke outlet of the long bag low-pressure dust collector; a cold air valve is provided on the air outlet pipe; a conveying pump is connected to the long bag low-pressure dust collector; a secondary circulation fan is connected to the long bag low-pressure dust collector via a pipe, and the secondary circulation fan is connected to the preheater silo 5.

[0032] Specifically, a heat sink 9 is welded to the top of the preheating shell 2. The limestone 11 in the preheater hopper 5 is preheated through the preheating shell 2 and the heat sink 9. The hot air in the long bag low-pressure dust collector (not shown in the figure) is drawn into the preheater hopper 5 by the secondary circulation fan (not shown in the figure) to preheat the limestone 11. The limestone 11 in the preheater hopper 5 is preheated to above 80°C and then transported to the annular channel 4 of the preheating shell 2 to finally preheat the limestone 11, reduce the time required for preheating the limestone 11, reduce the cracking of the limestone 11, and improve the decomposition rate of the limestone 11. The exhaust gas temperature is kept below 220°C by the cold air valve (not shown in the figure) to protect the filter bags of the long bag low-pressure dust collector.

[0033] The above description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns, applied to a rotary kiln, wherein the rotary kiln is equipped with a kiln tail flue chamber, characterized in that... The system includes a preheating unit, which includes a preheating shell. The kiln tail flue is connected to an air inlet pipe, and the air inlet pipe is connected to the preheating shell. An annular channel is provided inside the preheating shell. The annular channel is divided into multiple preheating spaces, and each preheating space is connected to a preheater feeding pipe at its top. Each of the preheater feed pipes is connected through the same annular pipe body; The top of the preheating shell is equipped with heat sinks.

2. The novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns according to claim 1, characterized in that, A preheater hopper is provided at the top of the preheating shell.

3. A novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns according to claim 1, characterized in that, The air outlet of the preheating shell is connected to a long bag low-pressure dust collector via an air outlet pipe.

4. A novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns according to claim 3, characterized in that, The exhaust port of the long bag low-pressure dust collector is connected to a high-temperature fan.

5. A novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns according to claim 3, characterized in that, A cold air valve is installed on the air outlet pipe.

6. A novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns according to claim 3, characterized in that, The long bag low-pressure dust collector is connected to a conveying pump.

7. A novel high-capacity, low-resistance 16-push-head vertical preheater for rotary kilns according to claim 3, characterized in that, The long bag low-pressure dust collector is connected to a secondary circulation fan via a pipe, and the secondary circulation fan is connected to the preheater silo.

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