Pipeline temperature control device for rotary flash dryer

Abstract

The utility model provides a pipeline temperature control device for a rotary type flash drying machine. The pipeline temperature control device comprises a linear combustor (2), the rotary type flash drying machine (3), an automatic feeding device (4) and a pulse bag type dust collector (7), an air outlet of the linear combustor (2) is connected with an air inlet of the rotary flash dryer (3), an automatic feeding device (4) is arranged at a feeding port of the rotary flash dryer (3), and a cold air supplementing valve (6) is arranged on a hot air material pipeline (5) connected with an air outlet of the rotary flash dryer (3). And one end of the hot air material pipeline (5), which is far away from the cold air supplement valve (6), is connected with a pulse bag type dust collector (7). According to the device, the temperature reaching the pulse bag type dust collector (7) can be automatically adjusted, so that the service life of a cloth bag in the pulse bag type dust collector (7) is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of rotary dryers, in particular to a pipeline temperature control device for a rotary flash dryer. Background Art

[0002] The rotary flash dryer is a continuous drying equipment, mainly used for drying pastes, filter cakes, powders, etc. Since the material stays in the dryer for a short time, it can usually be treated at high temperatures, and even some heat-sensitive materials can be processed.

[0003] The working principle of the rotary flash dryer is to use the hot air generated by the linear burner to dry the wet material. Specifically, the wet material is fed into the dryer through the automatic feeding device. Under the action of the high-speed crushing device, the wet material is fully exposed to the hot air and is dried instantly. After the dried material is classified by the classifier, the qualified products are collected by the pulse bag dust collector through the air outlet duct.

[0004] However, when the rotary flash dryer is turned on, if the automatic feeding device is suspended, the feeding is interrupted, or the feeding amount is improperly controlled, the outlet temperature of the rotary flash dryer will exceed the reasonable temperature resistance range of the bags inside the pulse bag dust collector, which will seriously affect the service life of the bags. Utility Model Content

[0005] In view of the above problems, the utility model provides a pipeline temperature control device for a rotary flash dryer, which can automatically adjust the temperature reaching a pulse bag dust collector, thereby extending the service life of the bags inside the pulse bag dust collector.

[0006] In order to achieve the above-mentioned purpose of the utility model, the utility model provides a pipeline temperature control device for a rotary flash dryer, comprising: a linear burner, a rotary flash dryer, an automatic feeding device, and a pulse bag dust collector; the air outlet of the linear burner is connected to the air inlet of the rotary flash dryer, the feed inlet of the rotary flash dryer is provided with the automatic feeding device, a cold air supply valve is provided on the hot air material pipeline connected to the air outlet of the rotary flash dryer, and the pulse bag dust collector is connected to one end of the hot air material pipeline away from the cold air supply valve.

[0007] The beneficial effects of the utility model are:

[0008] 1. The device provided by the utility model not only effectively improves the production economic benefits of the rotary flash dryer, but also protects the pulse bag dust collector and the bag from damage, and also effectively protects the personal safety of the operator by installing a cold air supply valve on the hot air material pipeline and forming a closed-loop PID interlocking control with the automatic feeding device of the rotary flash dryer.

[0009] 2. The device disclosed in the utility model effectively improves the production processing capacity of the rotary flash dryer and effectively prolongs the service life of the cloth bag.

[0010] 3. The utility model has simple structure and operation, convenient maintenance, safety and reliability; the whole working action is fast and flexible, which not only improves the production efficiency but also has good working stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The above contents and other purposes, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0012] Figure 1 It is a schematic diagram of a pipeline temperature control device for a rotary flash dryer provided in an embodiment of the utility model.

[0013] In the above drawings, the corresponding reference numerals are described as follows:

[0014] 1: Heat exchanger, 2: Linear burner, 3: Rotary flash dryer, 4: Automatic feeding device, 5: Hot air material pipeline, 6: Cold air supply valve, 7: Pulse bag dust collector, 8: induced draft fan. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0016] In view of the fact that when a rotary flash dryer in the related art is started up, the automatic feeding device is suspended, the material is cut off, or the feeding amount is improperly controlled, which causes the temperature at the air outlet of the rotary flash dryer to exceed the reasonable temperature resistance range of the bags inside the pulse bag dust collector, the utility model proposes a pipeline temperature control device for a rotary flash dryer to automatically adjust the temperature reaching the pulse bag dust collector, thereby extending the service life of the bags inside the pulse bag dust collector.

[0017] Specifically, the utility model discloses a pipeline temperature control device for a rotary flash dryer, such as Figure 1 As shown, it includes a linear burner 2, a rotary flash dryer 3, an automatic feeding device 4, and a pulse bag dust collector 7. The air outlet of the linear burner 2 is connected to the air inlet of the rotary flash dryer 3, the feed port of the rotary flash dryer 3 is provided with an automatic feeding device 4, a cold air supply valve 6 is provided on the hot air material pipeline 5 connected to the air outlet of the rotary flash dryer 3, and the end of the hot air material pipeline 5 away from the cold air supply valve 6 is connected to the pulse bag dust collector 7.

[0018] The device disclosed in the utility model not only effectively improves the production economic benefits of the rotary flash dryer 3, but also protects the pulse bag dust collector 7 and the bag from damage by installing a cold air supply valve 6 on the hot air material pipeline 5 and forming a closed-loop PID interlocking control with the automatic feeding device 4 of the rotary flash dryer 3.

[0019] Furthermore, the pipeline temperature control device for the rotary flash dryer also includes a heat exchanger 1 connected to the air inlet of the linear burner 2.

[0020] Furthermore, the heat exchanger 1 is a plate heat exchanger, which has the characteristics of high heat exchange efficiency, low heat loss, compact and light structure, small footprint, easy installation and cleaning, long service life, etc. The plate heat exchanger 1 is introduced into the present device, so that under the same pressure loss, its heat transfer coefficient is 3 to 5 times higher than that of other types of heat exchangers, and the footprint is one-third of that of other heat exchangers, and the heat recovery rate can reach more than 90%.

[0021] Furthermore, the linear burner 2 is a low-nitrogen linear burner, and its working principle is: during combustion, by controlling factors such as air supply mode, combustion temperature and time, the byproduct NO is reduced when the fuel and air are mixed. x The introduction of low-nitrogen linear burners in this device can significantly reduce NO x Emissions can improve air quality, reduce energy consumption, increase combustion efficiency, reduce ash and sulfide emissions, and protect the environment.

[0022] Furthermore, the automatic feeding device 4 is composed of a silo, a feeding screw and a feeding screw motor. The silo is designed with a spiral belt stirring. The belt conveyor of the upstream equipment feeds the filter cake into the silo of the automatic feeding device 4, and after the spiral belt stirring and breaking, it is conveyed to the lower part of the drying chamber of the rotary flash dryer 3 by the feeding screw at the bottom of the silo. Under the action of the high-speed crushing device, it is fully contacted with the hot air and dried instantly. In addition, the feeding amount can be controlled by adjusting the rotation speed of the feeding screw.

[0023] Furthermore, the cold air supply valve 6 is a pneumatic butterfly valve, which has the functions of regulating or cutting off, simple structure, small size, light weight, low cost, etc. The introduction of the pneumatic butterfly valve in this device can adjust the flow medium on low-pressure large and medium-caliber pipelines. Specifically, the pneumatic butterfly valve of model DN400 and the automatic feeding device 4 form a closed-loop PID interlocking control, and then give different instructions to the automatic feeding device 4 according to the outlet temperature value, so as to achieve the outlet temperature of the rotary flash dryer fluctuating within the range of ±2°C.

[0024] Specifically, the outlet air temperature is set on the flash dryer control cabinet. When the measured outlet air temperature is lower than the set temperature, a signal is transmitted to the frequency converter of the feeding screw motor of the automatic feeding device, and the speed of the feeding screw motor changes. That is, when the outlet air temperature is high, the speed is fast, increasing the amount of material flowing in; when the outlet air temperature is low, the speed is slow, and then the flow rate of the gas is slowed down, reducing the amount of material flowing in.

[0025] Furthermore, the pipeline temperature control device for the rotary flash dryer also includes an induced draft fan 8 connected to an end of the pulse bag dust collector 7 away from the hot air material pipeline 5 .

[0026] The working principle of the device involved in the utility model is: the wet material is fed into the lower part of the rotary flash dryer 3 through the automatic feeding device 4, and the wet material is crushed and quickly dried. Under the action of the vortex hot air, on the one hand, the finer powder particles pass through the classifier outlet at the top of the drying chamber along the hot air material pipeline 5 into the pulse bag dust collector 7, and then are discharged through the automatic unloader at the bottom of the pulse bag dust collector 7, and the dry exhaust gas is discharged through the induced draft fan 8; on the other hand, the larger particles are blocked and return to the drying chamber to continue to be dried.

[0027] Furthermore, when the rotary flash dryer 3 is in operation, the air inlet temperature can rise to 150°C, and the automatic feeding device 4 is started to feed slowly. Once there is material overhead in the automatic feeding device 4 or the feeding screw of the automatic feeding device 4 fails, the cold air supply valve 6 will automatically open the corresponding proportion according to the set parameters to supply cold air to the hot air material pipeline 5, thereby automatically adjusting and controlling the temperature reaching the pulse bag dust collector 7.

[0028] In addition, since the cold air supply valve 6 and the automatic feeding device 4 form a closed-loop PID interlocking control, as the air inlet temperature of the rotary flash dryer 3 rises or falls, the cold air supply valve 6 will automatically close or open the corresponding proportion, thereby instructing the automatic feeding device 4 to increase or decrease the feeding speed, and finally realize automatic adjustment and control of the temperature reaching the pulse bag dust collector 7.

[0029] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipeline temperature control device for a rotary flash dryer, comprising: A linear burner (2), a rotary flash dryer (3), an automatic feeding device (4), and a pulse bag dust collector (7), characterized in that the air outlet of the linear burner (2) is connected to the air inlet of the rotary flash dryer (3), the feed port of the rotary flash dryer (3) is provided with the automatic feeding device (4), a cold air supply valve (6) is provided on the hot air material pipeline (5) connected to the air outlet of the rotary flash dryer (3), and the end of the hot air material pipeline (5) away from the cold air supply valve (6) is connected to the pulse bag dust collector (7).

2. The device according to claim 1, characterized in that The cold air supply valve (6) is a pneumatic butterfly valve.

3. The device according to claim 1, characterized in that It also includes a heat exchanger (1) connected to the air inlet of the linear burner (2).

4. The device according to claim 1, characterized in that It also includes an induced draft fan (8) connected to one end of the pulse bag dust collector (7) away from the hot air material pipeline (5).

5. The device according to claim 1, characterized in that The automatic feeding device (4) is composed of a silo, a feeding screw and a feeding screw motor.

6. The device according to claim 1, characterized in that The linear burner (2) is a low-nitrogen linear burner.

7. The device according to claim 3, characterized in that The heat exchanger (1) is a plate heat exchanger.

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