A rotary kiln combustion chamber with reduced losses

Abstract

The utility model discloses a rotary kiln combustion chamber that reduces loss relates to the technical field of calcining equipment, including combustion chamber outer shell, bottom bearing frame, the inside of combustion chamber outer shell is lined with lining brick, the right side fixedly connected with kiln head cover of bottom bearing frame top, the top of fan support frame is equipped with combustion -supporting fan, the left side fixedly connected with cloth bag dust catcher of bottom bearing frame top, the top of cloth bag dust catcher right side is provided with gas outlet, the fixed connection of combustion -supporting fan, gas outlet has the air inlet pipe, the bottom of cloth bag dust catcher left side is provided with air inlet. This rotary kiln combustion chamber that reduces loss is provided with combustion chamber outer shell and lining brick, and combustion chamber outer shell and lining brick constitute the main part of combustion chamber, cancel the original mixing chamber, the two parts of shrinkage, shorten the main part of combustion chamber simultaneously, realize the function of reducing heat energy loss, solve the problem of device temperature is high, and heat energy loss is too big.

Description

Technical Field

[0001] This utility model relates to the field of roasting equipment technology, specifically to a rotary kiln combustion chamber that reduces losses. Background Technology

[0002] Rotary kilns provide heat energy by burning fuel (mainly coal gas) in burners. The heat energy is evenly distributed from the kiln head to the kiln tail by using a kiln head combustion fan, a secondary air fan, and a kiln tail fan to draw air. Metatitanic acid, the raw material after salt treatment, enters the kiln tail after being dehydrated by a filter press and a rotary drum. Under the action of gravity, it moves towards the kiln head and becomes a semi-finished product through the processes of dehydration, desulfurization, crystal transformation, and particle growth.

[0003] Currently, the common rotary kiln combustion chamber design consists of three parts: combustion chamber, mixing chamber, and contraction opening. Due to the excessive length of the combustion chamber and the limitation of effective heat transfer by the contraction opening, the combustion chamber temperature is significantly higher, resulting in excessive heat loss.

[0004] Now, a novel rotary kiln combustion chamber with reduced losses is proposed to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a rotary kiln combustion chamber with reduced heat loss, so as to solve the problems of excessively high temperature and excessive heat loss mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a rotary kiln combustion chamber for reducing losses, comprising an outer shell of the combustion chamber and a bottom support frame. The outer shell of the combustion chamber is lined with inner bricks. A kiln head hood is fixedly connected to the right side of the top of the bottom support frame. A combustion chamber reserved opening is provided on the right side of the kiln head hood. A burner interface is provided on the left side of the kiln head hood. A fan support frame is fixedly connected to the middle position of the top of the bottom support frame. A PLC controller is fixedly connected to the front end of the fan support frame. A combustion-supporting fan is installed at the top of the fan support frame. A bag filter is fixedly connected to the left side of the top of the bottom support frame. An air outlet is provided at the top right side of the bag filter. An air inlet pipe is fixedly connected between the combustion-supporting fan and the air outlet. An air inlet is provided at the bottom left side of the bag filter.

[0007] As a further technical solution of this utility model, the outer diameter of the outer shell of the combustion chamber is adapted to the inner diameter of the reserved opening of the combustion chamber, and the outer shell of the combustion chamber can rotate inside the reserved opening of the combustion chamber.

[0008] As a further technical solution of this utility model, the horizontal center lines of the combustion chamber reserved opening and the burner interface coincide, and the left side of the outer shell of the combustion chamber extends into the interior of the kiln head hood.

[0009] As a further technical solution of this utility model, the combustion fan, the air inlet pipe, the air outlet, and the bag filter are internally connected, and the PLC controller and the combustion fan are electrically connected.

[0010] As a further technical solution of this utility model, a temperature sensor is installed at the top of the air inlet, and an audible and visual alarm is fixedly connected to the top of the temperature sensor. A solenoid valve is connected to the left flange of the air inlet.

[0011] As a further technical solution of this utility model, the temperature sensor passes through the top of the air inlet and extends into the interior, and the PLC controller, temperature sensor, audible and visual alarm, and solenoid valve are electrically connected.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the reduced-loss rotary kiln combustion chamber not only realizes the function of reducing heat loss, but also realizes the function of recovering powder in the circulating air, and also realizes the function of monitoring the temperature of the circulating air.

[0013] (1) By setting up an outer shell and inner lining bricks for the combustion chamber, the original mixing chamber and contraction port are eliminated, and the main body of the combustion chamber is shortened. Taking titanium dioxide production as an example, the gas consumption is first determined based on the temperature of the TiO2 pigment. When the temperature is around 930℃ at the 9m point, the gas consumption is 1000m³. 3 Based on an air-to-air ratio of approximately 4:1 and an excess air coefficient of 1.2, the total air volume is determined to be 5000 m³ / h. 3 The flow rate was approximately 100 m³ / h. Then, based on the 0.2% concentration in the exhaust gas, the negative pressure of the rotary kiln was adjusted to 8%–10%. Observations showed a significant decrease in combustion chamber temperature and a moderate reduction in feed inlet temperature, effectively reducing high-temperature sintering of the material. The decrease in tail gas temperature at 14m was due to both reduced airflow and increased output and material layer thickness after the rotary kiln modification, but the overall combustion intensity decreased. The instantaneous average flow rate of gas consumption decreased from 1300 m³ / h. 3 / h dropped to 1000m 3 With a production rate of approximately 40 tons / day before the upgrade and 45 tons / day after the upgrade, the gas consumption per ton of titanium dioxide increases from 780 m³ / h. 3 / t dropped to 533m 3 / t, the effect is very significant, and the function of reducing heat loss is achieved;

[0014] (2) By setting up a combustion fan, air inlet pipe, air outlet, bag filter and air inlet, the large rotary kiln adopts hot air circulation technology. The hot air heated by the cooling kiln provides combustion air and secondary air for the rotary kiln. Since the cooling kiln tube seal inevitably has some leakage points, the primary and secondary air contain some dust. After high-temperature calcination, it will not only affect the quality of the finished product, but also be easily carried away by the exhaust gas and cause losses. The circulating air passes through the bag filter before being sent into the combustion chamber by the combustion fan. The powder in the airflow is intercepted by the bag filter, which facilitates subsequent recovery and realizes the function of recovering the powder in the circulating air.

[0015] (3) By setting a temperature sensor, an audible and visual alarm and a solenoid valve, when in use, the circulating air enters the bag filter along the air inlet. The temperature sensor monitors the airflow temperature. When the temperature is too high, the audible and visual alarm will sound an alarm and the solenoid valve will close to avoid damage to the filter bag, thus realizing the function of circulating air temperature monitoring. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of the present utility model;

[0017] Figure 2 This is a front view cross-sectional structural diagram of the outer shell of the combustion chamber of this utility model;

[0018] Figure 3 For the present utility model Figure 1 Enlarged cross-sectional view of a portion of point A in the middle section;

[0019] Figure 4 This is a schematic diagram of the original combustion chamber's frontal cross-sectional structure.

[0020] Figure 5 This is a side view of the kiln head cover structure of this utility model.

[0021] In the diagram: 1. Outer shell of the combustion chamber; 2. Inner lining bricks; 3. Kiln head hood; 4. Combustion chamber reserved opening; 5. Bottom support frame; 6. Fan support frame; 7. PLC controller; 8. Burner interface; 9. Combustion fan; 10. Air inlet pipe; 11. Air outlet; 12. Bag filter; 13. Air inlet; 14. Temperature sensor; 15. Audible and visual alarm; 16. Solenoid valve. Detailed Implementation

[0022] 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.

[0023] Example: Please refer to Figure 1-5 A rotary kiln combustion chamber for reducing losses includes an outer shell 1 and a bottom support frame 5. The outer shell 1 is lined with inner bricks 2. A kiln head hood 3 is fixedly connected to the right side of the top of the bottom support frame 5. A combustion chamber reserved opening 4 is opened on the right side of the kiln head hood 3. A burner interface 8 is provided on the left side of the kiln head hood 3. A fan support frame 6 is fixedly connected to the middle position of the top of the bottom support frame 5. A PLC controller 7 is fixedly connected to the front end of the fan support frame 6. A combustion fan 9 is installed at the top of the fan support frame 6. A bag filter 12 is fixedly connected to the left side of the top of the bottom support frame 5. An air outlet 11 is provided at the top right side of the bag filter 12. An air inlet pipe 10 is fixedly connected between the combustion fan 9 and the air outlet 11. An air inlet 13 is provided at the bottom left side of the bag filter 12.

[0024] The outer diameter of the outer shell 1 of the combustion chamber is matched with the inner diameter of the reserved opening 4 of the combustion chamber. The outer shell 1 of the combustion chamber can rotate inside the reserved opening 4 of the combustion chamber. The horizontal center lines of the reserved opening 4 of the combustion chamber and the burner interface 8 coincide. The left side of the outer shell 1 of the combustion chamber extends into the interior of the kiln head hood 3, which improves thermal efficiency and reduces heat loss.

[0025] Specifically, such as Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the outer shell 1 and inner lining bricks 2 of the combustion chamber constitute the main body of the combustion chamber. The original mixing chamber and contraction port are eliminated, and the main body of the combustion chamber is shortened.

[0026] The combustion blower 9, the air inlet pipe 10, the air outlet 11, and the bag filter 12 are internally connected, and the PLC controller 7 and the combustion blower 9 are electrically connected to facilitate the collection of powder.

[0027] Specifically, such as Figure 1 and Figure 3 As shown, the large rotary kiln adopts hot air circulation technology. The hot air heated by the cooling kiln provides combustion air and secondary air for the rotary kiln. Since there are inevitably some leaks in the cooling kiln tube seal, some dust is carried in the primary and secondary air. After high-temperature calcination, it will not only affect the quality of the finished product, but also be easily carried away by the exhaust gas, causing losses. The circulating air passes through the bag filter 12 before being sent into the combustion chamber by the combustion fan 9. The powder in the airflow is intercepted by the bag filter 12, which facilitates subsequent recovery.

[0028] A temperature sensor 14 is installed at the top of the air inlet 13. An audible and visual alarm 15 is fixedly connected to the top of the temperature sensor 14. A solenoid valve 16 is connected to the left flange of the air inlet 13. The temperature sensor 14 passes through the top of the air inlet 13 and extends into the interior. The PLC controller 7, the temperature sensor 14, the audible and visual alarm 15, and the solenoid valve 16 are electrically connected to facilitate monitoring of the air intake temperature.

[0029] Specifically, such as Figure 1 and Figure 3 As shown, circulating air enters the bag filter 12 through the air inlet 13. The temperature sensor 14 monitors the airflow temperature. When the temperature is too high, the audible and visual alarm 15 sounds an alarm, and the solenoid valve 16 closes to prevent damage to the filter bag.

[0030] Working Principle: In use, this invention firstly, the outer shell 1 and inner lining bricks 2 constitute the main body of the combustion chamber, eliminating the original mixing chamber and contraction port. Simultaneously, the main body of the combustion chamber is shortened. Taking titanium dioxide production as an example, the gas consumption is first determined based on the temperature of the TiO2 pigment. At approximately 930℃ at the 9m point, the gas consumption is 1000m³. 3 Based on an air-to-air ratio of approximately 4:1 and an excess air coefficient of 1.2, the total air volume is determined to be 5000 m³ / h. 3 The flow rate was approximately 100 m³ / h. Then, based on the 0.2% concentration in the exhaust gas, the negative pressure of the rotary kiln was adjusted to 8%–10%. Observations showed a significant decrease in combustion chamber temperature and a moderate reduction in feed inlet temperature, effectively reducing high-temperature sintering of the material. The decrease in tail gas temperature at 14m was due to both reduced airflow and increased output and material layer thickness after the rotary kiln modification, but the overall combustion intensity decreased. The instantaneous average flow rate of gas consumption decreased from 1300 m³ / h. 3 / h dropped to 1000m 3 With a production rate of approximately 40 tons / day before the upgrade and 45 tons / day after the upgrade, the gas consumption per ton of titanium dioxide increases from 780 m³ / h. 3 / t dropped to 533m 3 / t, with remarkable results. The large rotary kiln adopts hot air circulation technology. The hot air, heated by the cooling kiln, provides combustion air and secondary air for the rotary kiln. Due to the unavoidable leaks in the cooling kiln tube seals, some dust is carried in the primary and secondary air. This dust not only affects the quality of the finished product after high-temperature calcination but is also easily carried away by the exhaust gas, causing losses. Before being sent into the combustion chamber by the combustion fan 9, the circulating air passes through the bag filter 12. The dust in the airflow is intercepted by the bag filter 12, facilitating subsequent recovery. The circulating air enters the bag filter 12 through the air inlet 13. The temperature sensor 14 monitors the airflow temperature. When the temperature is too high, the audible and visual alarm 15 sounds an alarm, and the solenoid valve 16 closes to prevent damage to the filter bags.

[0031] 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 rotary kiln combustion chamber for reducing losses, comprising an outer shell (1) and a bottom support frame (5), characterized in that: The combustion chamber shell (1) is lined with bricks (2). A kiln head hood (3) is fixedly connected to the right side of the top of the bottom support frame (5). A combustion chamber reserved opening (4) is opened on the right side of the kiln head hood (3). A burner interface (8) is provided on the left side of the kiln head hood (3). A fan support frame (6) is fixedly connected to the middle position of the top of the bottom support frame (5). A PLC controller (7) is fixedly connected to the front end of the fan support frame (6). A combustion-supporting fan (9) is installed at the top of the fan support frame (6). A bag filter (12) is fixedly connected to the left side of the top of the bottom support frame (5). An air outlet (11) is provided on the top right side of the bag filter (12). An air inlet pipe (10) is fixedly connected between the combustion-supporting fan (9) and the air outlet (11). An air inlet (13) is provided at the bottom left side of the bag filter (12).

2. The rotary kiln combustion chamber for reducing losses according to claim 1, characterized in that: The outer diameter of the outer shell (1) of the combustion chamber is matched with the inner diameter of the reserved opening (4) of the combustion chamber, and the outer shell (1) of the combustion chamber can rotate inside the reserved opening (4) of the combustion chamber.

3. The rotary kiln combustion chamber for reducing losses according to claim 1, characterized in that: The horizontal center lines of the combustion chamber reserved opening (4) and the burner interface (8) coincide, and the left side of the outer shell (1) of the combustion chamber extends into the interior of the kiln head cover (3).

4. The rotary kiln combustion chamber for reducing losses according to claim 1, characterized in that: The combustion-supporting fan (9), air inlet pipe (10), air outlet (11), and bag filter (12) are internally connected, and the PLC controller (7) and combustion-supporting fan (9) are electrically connected.

5. A rotary kiln combustion chamber for reducing losses according to claim 1, characterized in that: A temperature sensor (14) is installed at the top of the air inlet (13), and an audible and visual alarm (15) is fixedly connected to the top of the temperature sensor (14). A solenoid valve (16) is connected to the left flange of the air inlet (13).

6. A rotary kiln combustion chamber for reducing losses according to claim 5, characterized in that: The temperature sensor (14) passes through the top of the air inlet (13) and extends into the interior. The PLC controller (7), temperature sensor (14), audible and visual alarm (15), and solenoid valve (16) are electrically connected.

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