A sleeve kiln fueled by natural gas

Abstract

The utility model relates to the field of sleeve kiln discloses a sleeve kiln with natural gas as fuel, including sleeve kiln main part, the inside of sleeve kiln main part is provided with combustion chamber, the outside of combustion chamber is provided with annular combustion section, the top of sleeve kiln main part is fixedly connected with hopper, the right side of sleeve kiln main part is fixedly connected with burner, the top of burner is fixedly connected with connecting pipe, the end of connecting pipe is fixedly connected with air ring pipe, the bottom of sleeve kiln main part is fixedly connected with discharge pipe. This sleeve kiln with natural gas as fuel replaces the burner with low speed, realizes the full mixing of fuel and combustion air, the flame shape is more regular, the length is more controllable, avoids the direct scouring of flame to kiln lining, improves the combustion efficiency and prolongs the life of refractory material, temperature sensor and pressure gauge adjust the proportion of fuel gas and air according to the temperature, pressure and exhaust composition in kiln in real time, realize dynamic optimal air-fuel ratio, solve the problem of poor combustion effect.

Description

Technical Field

[0001] This utility model relates to the field of sleeve kiln technology, specifically a sleeve kiln that uses natural gas as fuel. Background Technology

[0002] A sleeve lime kiln is a ring-shaped lime calcination device, belonging to the industrial lime kiln type. It is mainly used in the steel, calcium carbide and chemical industries to produce highly active lime using fuels such as coke oven gas and calcium carbide furnace tail gas. The activity of lime is improved through a composite calcination process.

[0003] The sleeve lime kiln mainly adopts the concentric arrangement of inner and outer double cylinders to form a ring-shaped calcination space, which is divided into a preheating zone, a counter-current calcination zone, a parallel-current calcination zone and a cooling zone from top to bottom. Traditional sleeve lime kilns have problems such as poor combustion effect and relatively simple combustion intelligence, resulting in excessive heat loss and incomplete combustion.

[0004] There is an urgent need for a sleeve kiln that uses natural gas as fuel to solve the technical defects mentioned above. Utility Model Content

[0005] The purpose of this invention is to provide a sleeve kiln that uses natural gas as fuel, in order to solve the problem of poor combustion effect mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a sleeve kiln using natural gas as fuel, comprising a sleeve kiln body, a combustion chamber disposed inside the sleeve kiln body, an annular combustion section disposed outside the combustion chamber, a hopper fixedly connected to the top of the sleeve kiln body, a burner fixedly connected to the right side of the sleeve kiln body, a connecting pipe fixedly connected to the top of the burner, an air ring pipe fixedly connected to the end of the connecting pipe, a discharge pipe fixedly connected to the bottom of the sleeve kiln body, a vibrator fixedly connected inside the discharge pipe, a discharge pipe fixedly connected to the bottom of the discharge pipe, an exhaust gas induced draft fan disposed on the right side of the sleeve kiln body, an ejector fan disposed on the left side of the sleeve kiln body, an exhaust pipe fixedly connected to the top of the left side of the sleeve kiln body, a heat exchanger fixedly installed at the end of the exhaust pipe, a heat exchange tube fixedly connected to the output end of the heat exchanger, and temperature sensors fixedly installed on both sides inside the sleeve kiln body.

[0007] As a further technical solution of this utility model, the temperature sensor is electrically connected to the burner, and a pressure gauge is installed on the burner.

[0008] As a further technical solution of this utility model, the temperature sensor is electrically connected to the burner, and a pressure gauge is installed on the burner.

[0009] As a further technical solution of this utility model, a preheating zone is provided at the top of the interior of the kiln body, and a valve is installed on the hopper.

[0010] As a further technical solution of this utility model, the input end of the exhaust gas fan is fixedly connected to an exhaust pipe, and the exhaust pipe is fixedly connected to the right side of the discharge pipe.

[0011] As a further technical solution of this utility model, the heat exchange tube is fixedly connected to the air inlet of the ejector fan, and the exhaust pipe is connected through the heat exchanger.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the sleeve kiln using natural gas as fuel not only achieves the function of enhancing combustion effect and facilitating ash removal, but also facilitates heat recovery.

[0013] (1) By setting burners, pressure gauges, connecting pipes, air ring pipes and temperature sensors, the burners on the main body of the sleeve kiln are replaced with low-speed, high-efficiency and low-NOx burners. These burners can achieve full mixing of fuel and combustion air, the flame shape is more regular and the length is more controllable, avoiding direct flame scouring of the kiln lining, improving combustion efficiency and extending the service life of refractory materials. The temperature sensor and pressure gauge adjust the ratio of fuel gas and air in real time according to the temperature, pressure and exhaust gas composition in the kiln to achieve dynamic optimal air-fuel ratio, avoiding heat loss caused by excessive air or incomplete combustion caused by insufficient air. This structure enhances the function of combustion effect.

[0014] (2) By setting up a discharge pipe, a vibrator, an exhaust gas fan and an exhaust pipe, the waste falls into the inside of the discharge pipe. The vibrator inside the discharge pipe shakes out the waste adhering to the inner wall of the discharge pipe by vibration to enhance the discharge effect. At the same time as the discharge, the exhaust gas fan can draw out the waste and exhaust gas inside the discharge pipe to clean it. This structure realizes the function of easy dust removal.

[0015] (3) By setting up heat exchangers, heat exchange tubes, ejector fans and exhaust pipes, the heat exchangers connected to the outside of the main body of the sleeve kiln adopt optimized heat exchangers. The heat exchangers optimize the heat exchange efficiency between the upper and lower combustion tubes and the exhaust gas passage, and maximize the recovery of exhaust gas heat to preheat the combustion air and coal gas, thereby reducing the final exhaust gas temperature. The ejector fans and heat exchange tubes ensure that the cooling air and the finished material exiting the kiln are fully heat exchanged. The heated cooling air can be sent into the kiln as combustion air or secondary air to recover heat. This structure realizes the function of facilitating heat recovery. Attached Figure Description

[0016] Figure 1 This is a frontal cross-sectional view of the present invention.

[0017] Figure 2This is a front view cross-sectional structural diagram of the main body of the sleeve kiln of this utility model;

[0018] Figure 3 This is a front view schematic diagram of the burner structure of this utility model;

[0019] Figure 4 This is a front view structural diagram of the heat exchanger of this utility model.

[0020] In the diagram: 1. Main body of the sleeve kiln; 2. Combustion chamber; 3. Annular combustion section; 4. Burner; 5. Pressure gauge; 6. Connecting pipe; 7. Air ring pipe; 8. Preheating zone; 9. Hopper; 10. Heat exchanger; 11. Heat exchange tube; 12. Temperature sensor; 13. Ejector fan; 14. Discharge pipe; 15. Vibrator; 16. Discharge pipe; 17. Exhaust gas induced draft fan; 18. Induced draft pipe; 19. Exhaust pipe. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1-4 This utility model provides an embodiment of a sleeve kiln using natural gas as fuel, comprising a sleeve kiln body 1, a combustion chamber 2 disposed inside the sleeve kiln body 1, an annular combustion section 3 disposed outside the combustion chamber 2, a hopper 9 fixedly connected to the top of the sleeve kiln body 1, a burner 4 fixedly connected to the right side of the sleeve kiln body 1, a connecting pipe 6 fixedly connected to the top of the burner 4, an air ring pipe 7 fixedly connected to the end of the connecting pipe 6, and a discharge pipe 14 fixedly connected to the bottom of the sleeve kiln body 1. A vibrator 15 is fixedly connected inside the discharge pipe 14, and a discharge pipe 16 is fixedly connected to the bottom end of the discharge pipe 14. A waste gas induced draft fan 17 is set on the right side of the sleeve kiln body 1, and an induced draft fan 13 is set on the left side of the sleeve kiln body 1. An exhaust pipe 19 is fixedly connected to the top of the left side of the sleeve kiln body 1, and a heat exchanger 10 is fixedly installed at the end of the exhaust pipe 19. A heat exchange tube 11 is fixedly connected to the output end of the heat exchanger 10. Temperature sensors 12 are fixedly installed on both sides inside the sleeve kiln body 1.

[0023] Temperature sensor 12 is electrically connected to burner 4. Pressure gauge 5 is installed on burner 4.

[0024] Specifically, such as Figure 1 and Figure 2As shown, the burner 4 on the main body 1 of the sleeve kiln is replaced with a low-speed, high-efficiency, low-NOx burner 4. This burner 4 can achieve full mixing of fuel and combustion air, resulting in a more regular flame shape and more controllable length. It avoids the flame directly scouring the kiln lining, improves combustion efficiency, and extends the service life of refractory materials. The temperature sensor 12 and pressure gauge 5 adjust the ratio of fuel gas and air in real time according to the temperature, pressure, and exhaust gas composition in the kiln to achieve a dynamic optimal air-fuel ratio, avoiding heat loss caused by excessive air or incomplete combustion caused by insufficient air.

[0025] The top of the main body 1 of the kiln is equipped with a preheating zone 8, a valve is installed on the hopper 9, and the input end of the exhaust fan 17 is fixedly connected to the exhaust pipe 18, which is fixedly connected to the right side of the discharge pipe 14.

[0026] Specifically, such as Figure 1 and Figure 3 As shown, the waste falls into the inside of the discharge pipe 14. The vibrator 15 inside the discharge pipe 14 shakes out the waste adhering to the inner wall of the discharge pipe 14 by vibration to enhance the discharge effect. At the same time, the exhaust fan 17 can draw out the waste and exhaust gas inside the discharge pipe 14 to clean it.

[0027] The heat exchange tube 11 is fixedly connected to the air inlet of the ejector fan 13, and the exhaust pipe 19 is connected through the heat exchanger 10.

[0028] Specifically, such as Figure 1 and Figure 4 As shown, the heat exchanger 10 connected to the outside of the main body 1 of the sleeve kiln adopts an optimized heat exchanger 10. The heat exchanger 10 optimizes the heat exchange efficiency between the upper and lower combustion cylinders and the exhaust gas passage, and maximizes the recovery of exhaust gas heat to preheat the combustion air and coal gas, thereby reducing the final exhaust gas temperature. The ejector fan 13 and the heat exchange tube 11 ensure that the cooling air and the finished material exiting the kiln exchange heat fully. The heated cooling air can be sent into the kiln as combustion air or secondary air to recover heat.

[0029] Working principle: The burners 4 on the main body 1 of the sleeve kiln are replaced with low-speed, high-efficiency, and low-NOx burners 4. These burners 4 can achieve full mixing of fuel and combustion air, resulting in a more regular flame shape and more controllable flame length. This avoids direct flame erosion of the kiln lining, improves combustion efficiency, and extends the service life of refractory materials. Temperature sensor 12 and pressure gauge 5 adjust the fuel-air ratio in real time based on the kiln temperature, pressure, and exhaust gas composition to achieve a dynamically optimal air-fuel ratio, avoiding heat loss due to excessive air or incomplete combustion due to insufficient air. The heat exchanger 10 connected externally to the main body 1 of the sleeve kiln is an optimized heat exchanger 10, which optimizes the upper and lower combustion... The heat exchange efficiency between the firing cylinders and the exhaust gas passage maximizes the recovery of exhaust gas heat to preheat the combustion air and coal gas, reducing the final exhaust gas temperature. The ejector fan 13 and heat exchange tube 11 ensure sufficient heat exchange between the cooling air and the finished material exiting the kiln. The heated cooling air can be sent into the kiln as combustion air or secondary air to recover heat. The waste falls into the inside of the discharge pipe 14. The vibrator 15 inside the discharge pipe 14 shakes out the waste adhering to the inner wall of the discharge pipe 14 through vibration to enhance the discharge effect. At the same time as the discharge, the exhaust gas induced draft fan 17 can draw out the waste and exhaust gas inside the discharge pipe 14 to clean it. This structure realizes the function of easy ash removal.

[0030] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A sleeve kiln fueled by natural gas, comprising a sleeve kiln body (1), characterized in that: The main body (1) of the sleeve kiln is provided with a combustion chamber (2) inside, and an annular combustion section (3) is provided outside the combustion chamber (2). A hopper (9) is fixedly connected to the top of the main body (1). A burner (4) is fixedly connected to the right side of the main body (1). A connecting pipe (6) is fixedly connected to the top of the burner (4). An air ring pipe (7) is fixedly connected to the end of the connecting pipe (6). A discharge pipe (14) is fixedly connected to the bottom of the main body (1). A vibrator is fixedly connected inside the discharge pipe (14). 15) The bottom end of the discharge pipe (14) is fixedly connected to the discharge pipe (16). The right side of the main body of the sleeve kiln (1) is provided with a waste gas induced draft fan (17). The left side of the main body of the sleeve kiln (1) is provided with an induced draft fan (13). The top left side of the main body of the sleeve kiln (1) is fixedly connected to an exhaust pipe (19). The end of the exhaust pipe (19) is fixedly installed with a heat exchanger (10). The output end of the heat exchanger (10) is fixedly connected to a heat exchange tube (11). Temperature sensors (12) are fixedly installed on both sides inside the main body of the sleeve kiln (1).

2. A sleeve kiln using natural gas as fuel according to claim 1, characterized in that: The temperature sensor (12) is electrically connected to the burner (4), and a pressure gauge (5) is installed on the burner (4).

3. A sleeve kiln using natural gas as fuel according to claim 1, characterized in that: The air ring pipe (7) is fixedly connected to the main body (1) of the sleeve kiln.

4. A sleeve kiln using natural gas as fuel according to claim 1, characterized in that: The top of the main body (1) of the sleeve kiln is provided with a preheating zone (8), and the hopper (9) is equipped with a valve.

5. A sleeve kiln using natural gas as fuel according to claim 1, characterized in that: The input end of the exhaust gas fan (17) is fixedly connected to an exhaust pipe (18), and the exhaust pipe (18) is fixedly connected to the right side of the discharge pipe (14).

6. A sleeve kiln using natural gas as fuel according to claim 1, characterized in that: The heat exchange tube (11) is fixedly connected to the air inlet of the ejector fan (13), and the exhaust pipe (19) is connected through the heat exchanger (10).

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