Kiln quenching air pipe system

Abstract

The utility model relates to a kiln quenching air pipe system, which is used for a kiln provided with a drying area, a preheating area, a sintering area, a quenching area, a slow cooling area and a rapid cooling area, and comprises a quenching fan, a quenching air pipe extending from the air outlet end of the quenching fan to the quenching area, and a rapid cooling air pipe extending to the rapid cooling area, the first air inducing pipe and the second air inducing pipe are connected with an air inlet of the induced draft fan, the first air inducing pipe extends to the slow cooling area, the second air inducing pipe extends to the rapid cooling area, and an air outlet of the induced draft fan is connected with an air exhaust main pipe. A combustion-supporting air pipe communicated to the sintering area and a first drying air pipe communicated to the drying area extend from the main exhaust pipe. According to the utility model, redundant heat can be supplied to high-temperature combustion-supporting air through the combustion-supporting fan, so that the energy consumption of a sintering area is reduced while the combustion efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kiln equipment, in particular to a rapid cooling air duct system for a kiln. Background Art

[0002] At present, roller kilns are generally used in the ceramic industry to fire products. The kiln of a roller kiln generally includes a drying zone, a preheating zone, a firing zone, a rapid cooling zone, a slow cooling zone and a fast cooling zone at the kiln tail. In terms of both thermal design and actual operation of traditional roller kiln furnaces, there are still some unsatisfactory aspects in the rational utilization of thermal energy. According to the thermal engineering data obtained from the thermal balance of some representative kilns, the sum of the heat extracted from the cooling zone and the heat carried away by the exhaust smoke accounts for 50-60% of the heat input to the kiln. That is to say, the heat used for firing products is less than 50%, which leads to a large amount of heat waste. Subsequently, through the cooperation of the reform of the ceramic production process and the further improvement of the drying equipment technology, with the efforts of technical personnel in the industry, most of the waste heat generated during the firing of the kiln can be supplied for drying the green bodies. Great progress has indeed been made in the utilization of waste heat in kilns.

[0003] However, in the actual production and use of kilns, for some enterprises, the heat extracted from the cooling zone and the heat carried away by the exhaust smoke discharged from the kiln are redundant when supplied to the drying line. The redundant part is only discharged into the air, and there is still a large amount of heat waste. Moreover, the kilns of some enterprises are too short and cannot adapt to increased production, resulting in the brick outlet temperature being above 200 °C, which also causes waste of cooling waste heat. Summary of the Utility Model

[0004] In order to solve the technical problems existing in the prior art that the heat extracted from the cooling zone and the heat carried away by the exhaust smoke are redundant when supplied to the drying line, the redundant part is only discharged into the air, and there is still a large amount of heat waste, and the brick outlet temperature of some enterprises is above 200 °C, resulting in waste of cooling waste heat, the utility model provides the following technical solutions.

[0005] A rapid cooling air duct system for a kiln of the utility model is used for a kiln provided with a drying zone, a preheating zone, a sintering zone, a rapid cooling zone, a slow cooling zone and a fast cooling zone, and includes a rapid cooling fan, a rapid cooling air duct extending from the air outlet end of the rapid cooling fan to the rapid cooling zone, and a fast cooling air duct extending to the fast cooling zone. It also includes an induced draft fan, a first induced draft air duct connected to the air inlet of the induced draft fan and extending to the slow cooling zone, and a second induced draft air duct extending to the fast cooling zone. The air outlet of the induced draft fan is connected with an exhaust main pipe, and the exhaust main pipe is respectively extended with a combustion-supporting air duct communicating with the sintering zone and a first drying air duct communicating with the drying zone.

[0006] As a further technical solution, the combustion-supporting air duct is connected with a combustion-supporting fan, and the air outlet of the combustion-supporting fan communicates with the sintering zone for adjusting the pressure and air volume of the combustion-supporting air.

[0007] As a further technical solution, the main exhaust pipe is connected with a vent valve for discharging excess heat, and the first drying air pipe is connected with an external hot blast stove.

[0008] As a further technical solution, the preheating zone is connected with a smoke exhaust fan, the air outlet of the smoke exhaust fan is connected with a dehumidifier, and the dehumidifier is connected to the drying zone through a second drying air pipe.

[0009] As a further technical solution, the dehumidifier is connected to a gas heat exchanger through a pipeline, and the gas heat exchanger is connected to the combustion-supporting air pipe.

[0010] As a further technical solution, the quench fan, the induced draft fan, the smoke exhaust fan and the combustion-supporting fan are all fans with adjustable pressure and volume flow rate.

[0011] The beneficial effects of the present utility model are as follows: the present utility model can extract the excess heat in the cooling zone and discharge the heat in the smoke exhaust zone to the drying zone to dry the brick embryos, thereby improving the heat utilization rate. And a combustion-supporting fan is arranged on one side of the sintering zone, so that the excess heat in the cooling zone can be used to provide combustion-supporting air with a higher temperature through the combustion-supporting fan, which can improve the combustion efficiency and reduce the energy consumption in the sintering zone. The excess heat in the smoke exhaust zone can be used to provide combustion-supporting air with a higher temperature to the sintering zone through the gas heat exchanger and the combustion-supporting fan, further improving the heat utilization rate and reducing the energy consumption. Description of the Drawings

[0012] Figure 1 is a connection schematic diagram of the quench air pipe system of the kiln furnace of the present utility model;

[0013] In the figure: 1 - preheating zone; 2 - sintering zone; 3 - quench zone; 4 - slow cooling zone; 5 - fast cooling zone; 6 - drying zone; 7 - quench fan; 701 - quench air pipe; 702 - fast cooling air pipe; 8 - induced draft fan; 801 - first induced draft air pipe; 802 - second induced draft air pipe; 803 - main exhaust pipe; 804 - combustion-supporting air pipe; 805 - first drying air pipe; 806 - vent valve; 9 - smoke exhaust fan; 901 - dehumidifier; 902 - second drying air pipe; 10 - hot blast stove; 11 - combustion-supporting fan; 12 - gas heat exchanger. Detailed Embodiments

[0014] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0015] Such asFigure 1 As shown, a rapid cooling air duct system of a kiln furnace in the present utility model is used for a kiln furnace provided with a drying zone 6, a preheating zone 1, a sintering zone 2, a rapid cooling zone 3, a slow cooling zone 4, and a fast cooling zone 5. The rapid cooling zone 3, the slow cooling zone 4, and the fast cooling zone 5 are collectively referred to as the cooling zone, and flue gas is discharged from the preheating zone 1. The above structure adopts the prior art and will not be described in detail herein.

[0016] In a specific embodiment, a rapid cooling air duct system of a kiln furnace in the present utility model includes a rapid cooling fan 7 provided on one side of the rapid cooling zone 3. An air outlet end of the rapid cooling fan 7 extends a rapid cooling air duct 701 towards the rapid cooling zone 3, and an air outlet end of the rapid cooling fan 7 extends a fast cooling air duct 702 towards the fast cooling zone 5. The rapid cooling fan 7 is used to extract external air to provide cooling air for the rapid cooling zone 3 and the fast cooling zone 5. It also includes an induced draft fan 8 provided on one side of the slow cooling zone 4. An air inlet of the induced draft fan 8 is connected to a first induced draft air duct 801 extending into the slow cooling zone 4, and an air inlet of the induced draft fan 8 is connected to a second induced draft air duct 802 extending into the fast cooling zone 5. The induced draft fan 8 is used to extract the excess heat in the cooling zone.

[0017] An air outlet of the induced draft fan 8 is connected to an exhaust main duct 803. The exhaust main duct 803 respectively extends a combustion-supporting air duct 804 communicating with the sintering zone 2 and a first drying air duct 805 communicating with the drying zone 6. The combustion-supporting air duct 804 is connected to a combustion-supporting fan 11, and an air outlet of the combustion-supporting fan 11 communicates with the sintering zone 2, which is used to adjust the pressure and air volume of the combustion-supporting air. At this time, the excess heat in the cooling zone can be provided to the drying zone 6 and the sintering zone 2, improving the heat utilization rate and reducing the energy consumption of the sintering zone 2 at the same time.

[0018] In a specific embodiment, the exhaust main duct 803 is connected to a vent valve 806 for discharging excess heat, and the first drying air duct 805 is connected to an external hot blast stove 10. When there is too much heat, it can be discharged by the vent valve 806. When there is insufficient heat, the external hot blast stove 10 can be used to provide heat for the drying zone 6.

[0019] In a specific embodiment, the preheating zone 1 is connected to an exhaust fan 9. An air outlet of the exhaust fan 9 is connected to a dehumidifier 901. The dehumidifier 901 is connected to the drying zone 6 through a second drying air duct 902, and the dehumidifier 901 is connected to a gas heat exchanger 12 through a pipeline. The gas heat exchanger 12 is connected to the combustion-supporting air duct 804. When the heat discharged by the exhaust fan 9 is excessive, the excess heat can be introduced into the sintering zone 2 through the combustion-supporting air duct 804 by the gas heat exchanger 12 to improve the heat utilization rate.

[0020] It should be known that the rapid cooling fan 7, the induced draft fan 8, the exhaust fan 9, and the combustion-supporting fan 11 are all fans that can set the pressure and volume flow rate. While accurately supplying air, they are used to adjust the combustion air coefficient in the sintering zone 2.

[0021] The principle of the present utility model is that the heat in the slow cooling zone 4, the rapid cooling zone 5 and the smoke exhaust area can be extracted, reducing heat waste, and the excess heat is discharged to the drying zone 6 to dry the brick embryos, improving the heat utilization rate. At the same time, the combustion air blower can provide combustion air at a higher temperature by using the excess heat in the cooling zone and the heat exchanged in the smoke exhaust zone. The combustion air at a higher temperature improves the combustion efficiency in the sintering zone 2 while reducing the energy consumption in the sintering zone 2.

[0022] The preferred specific embodiments and examples of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments and examples. Within the scope of knowledge possessed by those skilled in the art, various changes or equivalent substitutions can be made without departing from the concept of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A rapid cooling air duct system for a kiln, which is used for a kiln provided with a drying zone (6), a preheating zone (1), a sintering zone (2), a rapid cooling zone (3), a slow cooling zone (4) and a fast cooling zone (5), and is characterized in that: It includes a quenching fan (7), a quenching air duct (701) extending from the air outlet end of the quenching fan (7) to the quenching zone (3), and a rapid cooling air duct (702) extending to the rapid cooling zone (5), and also includes an induced draft fan (8), a first induced draft air duct (801) connected to the air inlet of the induced draft fan (8) and extending to the slow cooling zone (4), and a second induced draft air duct (802) extending to the rapid cooling zone (5). The air outlet of the induced draft fan (8) is connected with an exhaust main pipe (803), and a combustion-supporting air duct (804) communicating with the sintering zone (2) and a first drying air duct (805) communicating with the drying zone (6) are respectively extended from the exhaust main pipe (803).

2. The rapid cooling air duct system of a kiln furnace according to claim 1, characterized in that: The combustion-supporting air duct (804) is connected with a combustion-supporting fan (11), and the air outlet of the combustion-supporting fan (11) communicates with the sintering zone (2) for adjusting the pressure and air volume of the combustion-supporting air.

3. The rapid cooling air duct system of a kiln furnace according to claim 1, characterized in that: The exhaust main pipe (803) is connected with a vent valve (806) for discharging excess heat, and the first drying air duct (805) is connected with an external hot blast stove (10).

4. The rapid cooling air duct system of a kiln according to claim 2, characterized in that: The preheating zone (1) is connected with an exhaust gas fan (9), the air outlet of the exhaust gas fan (9) is connected with a dehumidifier (901), and the dehumidifier (901) is connected to the drying zone (6) through a second drying air duct (902).

5. A rapid cooling air duct system for a kiln furnace according to claim 4, characterized in that: The dehumidifier (901) is connected to a gas heat exchanger (12) through a pipeline, and the gas heat exchanger (12) is connected to the combustion-supporting air duct (804).

6. The rapid cooling air duct system of a kiln according to claim 4, characterized in that: The quenching fan (7), the induced draft fan (8), the exhaust gas fan (9) and the combustion-supporting fan (11) are all fans that can set the pressure and volume flow rate.

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