Anti-condensation mechanism of drying system

Abstract

The utility model discloses a drying system anti-condensation mechanism which is applied to a three-cylinder dryer, the three-cylinder dryer comprises a head cover, an inner cylinder, a middle cylinder, an outer cylinder and a tail cover, the tail cover is provided with a tail gas outlet and a discharge port, and the drying system anti-condensation mechanism comprises a hot air outlet; the hot air outlet is formed in the middle cylinder and located at the joint of the tail of the middle cylinder and the tail cover, and the inner cylinder is communicated with the tail gas outlet in the tail cover through the hot air outlet. The hot air outlet is formed in the middle cylinder, and a part of high-temperature hot flue gas in the inner cylinder is led out to be mixed with tail gas which normally passes through the three cylinders and then is discharged to the tail cover, so that the temperature of the tail gas is increased, and the phenomenon that the tail gas is condensed in a subsequent bag-type dust collector due to the too low temperature is prevented.

Description

Technical Field

[0001] The utility model relates to the field of mechanical manufacturing, in particular to a dew condensation prevention mechanism for a drying system of a triple-cylinder dryer. Background Art

[0002] In a drying system, in order to extend the contact time between materials and high-temperature hot flue gas and achieve the maximum utilization rate of heat, a triple-cylinder drying structure is often adopted. That is, a three-layer structure of an inner cylinder, a middle cylinder, and an outer cylinder. The high-temperature hot flue gas enters the inner cylinder from the head cover, and after passing through the inner cylinder, the middle cylinder, and the outer cylinder, it is discharged to the tail cover and finally discharged from the tail gas outlet to the bag filter at the rear end for filtration treatment. However, due to the long stroke caused by the triple-cylinder structure, or due to the fact that the temperature of the initially entering high-temperature hot flue gas is not set high enough (set based on the materials to be dried, and some materials cannot use too high a temperature), the temperature of the tail gas discharged from the tail gas outlet is too low, resulting in dew condensation in the subsequent bag filter. Summary of the Invention

[0003] The problem to be solved by the utility model is to propose an improvement scheme or a replacement scheme for the above-mentioned disadvantages in the prior art, especially an improvement or replacement scheme to avoid dew condensation in the subsequent process due to too low tail gas temperature.

[0004] To solve the above problem, the scheme adopted by the utility model is as follows: A dew condensation prevention mechanism for a drying system, which is applied to a triple-cylinder dryer. The triple-cylinder dryer includes a head cover, an inner cylinder, a middle cylinder, an outer cylinder, and a tail cover. The tail cover is provided with a tail gas outlet and a discharge port. The dew condensation prevention mechanism for the drying system is characterized in that it includes a hot air outlet; the hot air outlet is arranged on the middle cylinder, at the connection between the tail of the middle cylinder and the tail cover, and the hot air outlet connects the inner cylinder with the tail gas outlet on the tail cover. So that part of the high-temperature hot flue gas can directly enter the tail cover without passing through the middle cylinder and the outer cylinder, and mix with the tail cover outlet gas to increase its temperature, thereby achieving the purpose of preventing dew condensation.

[0005] Further, the dew condensation prevention mechanism for the drying system is characterized in that a regulating valve is arranged on the hot air outlet for regulating the opening size of the hot air outlet.

[0006] Further, the dew condensation prevention mechanism for the drying system is characterized in that the regulating valve is a manual butterfly valve.

[0007] Further, the dew condensation prevention mechanism for the drying system is characterized in that the regulating valve is an automatic regulating valve. The automatic regulating valve includes a valve, a servo motor, a temperature sensor, and a main controller; the valve is arranged on the hot air outlet; the servo motor is connected to the valve through a transmission rod and controls the opening and closing of the valve; the temperature sensor is arranged inside the tail gas outlet for monitoring the outlet air temperature inside the tail gas outlet; the temperature sensor and the servo motor are both connected to the main controller, and the main controller can control the operation or stop of the servo motor.

[0008] The high-temperature hot flue gas in the inner cylinder discharged from the hot air outlet is mixed with the tail gas that normally passes through the three cylinders and is discharged to the tail hood, thereby increasing the temperature of the gas discharged from the tail gas outlet and preventing condensation in the subsequent bag filter due to too low temperature.

[0009] The technical effects of the present utility model are as follows: Materials and hot air enter the inner cylinder - middle cylinder - outer cylinder - material outlet and tail gas outlet from the head hood. If the temperature of the tail gas is relatively low, the subsequent bag filter is prone to condensation. To prevent condensation, we open a hole in the rear cover plate of the middle cylinder of the dryer and install a manual butterfly valve, which allows part of the high-temperature flue gas to directly pass through the manual butterfly valve to the tail gas outlet after passing through the inner cylinder, increasing the temperature of the tail gas and thus preventing condensation.

[0010] The design of using an automatic regulating valve can not only increase the temperature of the tail gas but also precisely regulate the temperature of the tail gas, avoiding energy waste.

[0011] The transformation cost of this design is very low and has universality, being applicable to all existing three-cylinder dryer models. Description of the Drawings

[0012] Figure 1 It is a three-cylinder dryer (equipped with an anti-condensation mechanism for the drying system).

[0013] Figure 2 It is the cross-section of the drying cylinder Figure 1 .

[0014] Figure 3 It is the cross-section of the drying cylinder Figure 2 .

[0015] Among them, 1 is the head hood, 2 is the outer cylinder, 3 is the middle cylinder, 4 is the inner cylinder, 5 is the tail hood, 6 is the regulating valve, and 7 is the hot air outlet. Detailed Implementation Modes

[0016] The following further describes the present utility model in detail with reference to the drawings.

[0017] Embodiment: An anti-condensation mechanism for a drying system, which is applied to a three-cylinder dryer. The three-cylinder dryer includes a head hood, an inner cylinder, a middle cylinder, an outer cylinder, and a tail hood. The tail hood is provided with a tail gas outlet and a material outlet. The anti-condensation mechanism for the drying system includes a hot air outlet; the hot air outlet is arranged on the middle cylinder, at the connection between the tail of the middle cylinder and the tail hood, and the hot air outlet connects the inner cylinder with the tail gas outlet on the tail hood.

[0018] A regulating valve is provided at the hot air outlet for adjusting the opening size of the hot air outlet. The regulating valve is an automatic regulating valve, which includes a valve, a servo motor, a temperature sensor and a main controller; the valve is arranged at the hot air outlet; the servo motor is connected to the valve through a transmission rod and controls the opening and closing of the valve; the temperature sensor is arranged inside the tail gas outlet for monitoring the air outlet temperature inside the tail gas outlet; the temperature sensor and the servo motor are both connected to the main controller, and the main controller can control the operation or stop of the servo motor.

[0019] By providing a hot air outlet on the middle cylinder, a part of the high-temperature hot flue gas in the inner cylinder is led out and mixed with the tail gas that normally passes through the three cylinders and then is discharged to the tail hood, so as to increase the temperature of the tail gas and prevent condensation in the subsequent bag filter due to too low tail gas temperature.

[0020] And the hot air outlet is designed to be able to automatically adjust the size of the air outlet. Cooperating with the temperature sensor, the servo motor and the main controller, the butterfly valve can be actively and automatically controlled. Precise temperature adjustment is achieved, preventing condensation and avoiding energy waste at the same time.

Claims

1. A drying system anti-condensation mechanism, which is applied to a three-drum dryer, the three-drum dryer comprises a head cover, an inner drum, a middle drum, an outer drum and a tail cover, the tail cover is provided with an exhaust gas outlet and a material outlet, characterized in that: The anti-condensation mechanism of the drying system includes a hot air outlet; the hot air outlet is arranged on the middle cylinder, located at the junction of the tail of the middle cylinder and the tail cover, and the hot air outlet connects the inner cylinder with the exhaust outlet on the tail cover.

2. The anti-condensation mechanism of the drying system according to claim 1, characterized in that: The hot air outlet is provided with a regulating valve for adjusting the opening size of the hot air outlet.

3. The anti-condensation mechanism of the drying system according to claim 2, characterized in that: The regulating valve is a manual butterfly valve.

4. The anti-condensation mechanism of the drying system according to claim 2, characterized in that: The regulating valve is an automatic regulating valve, which includes a valve, a servo motor, a temperature sensor and a main controller; the valve is arranged on the hot air outlet; the servo motor is connected to the valve through a transmission rod and controls the opening and closing of the valve; the temperature sensor is arranged in the exhaust gas outlet to monitor the outlet air temperature in the exhaust gas outlet; the temperature sensor and the servo motor are evenly connected to the main controller, and the main controller can control the servo motor to work or stop.

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