Hot blast stove temperature control system for drying aluminum hydroxide micro powder

Abstract

The utility model relates to the field of aluminum hydroxide production equipment, in particular to a hot blast stove temperature control system for drying aluminum hydroxide micro powder. A hot-blast stove temperature control system for drying aluminum hydroxide micro powder comprises a hearth, one end of the hearth is connected with a combustor, the other end of the hearth is connected with an air outlet pipeline, the combustor is connected with a natural gas pipeline through a proportioning valve, and the hearth is further provided with a main air inlet pipeline and an auxiliary air inlet pipeline. The main air inlet pipeline and the auxiliary air inlet pipeline are connected with a main air blower and an auxiliary air blower respectively, a temperature sensor is arranged on the air outlet pipeline, and the proportioning valve, the main air blower, the auxiliary air blower and the temperature sensor are all electrically connected with the controller. The controller receives a temperature signal sent by the temperature sensor and controls the proportioning valve, the main air blower and the auxiliary air blower to act according to the signal. The temperature control system can accurately and stably control the temperature of discharged hot air, and then temperature control of the aluminum hydroxide micro powder drying procedure is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to aluminium hydroxide production equipment field, specifically is a kind of aluminium hydroxide micro powder drying hot blast stove temperature control system. BACKGROUND

[0002] Aluminium hydroxide micro powder is an important inorganic flame retardant, is widely used in plastics, rubber, paint, cable and other polymer materials, and its flame-retardant mechanism is mainly realized flame-retardant effect by heat absorption decomposition, release of water vapor and forming protective layer.In the process of aluminium hydroxide micro powder production, drying is one of important procedures, it can remove free water and part of crystallization water in aluminium hydroxide micro powder, ensure that product has stable physical and chemical properties, meet application requirements simultaneously.But in drying process, temperature control needs attention, when temperature is too high, it can cause aluminium hydroxide to decompose into alumina, and when temperature is too low, it will be not completely dried, therefore, a set of accurate and stable temperature control system is crucial for producing quality stable aluminium hydroxide micro powder. SUMMARY

[0003] The utility model aims at overcoming the insufficient in prior art, provide a kind of aluminium hydroxide micro powder drying hot blast stove temperature control system, the temperature control system can accurately and stably control the temperature of the hot air discharged, to ensure the temperature control of aluminium hydroxide micro powder drying procedure.

[0004] To solve prior art problems, the utility model discloses a kind of aluminium hydroxide micro powder drying hot blast stove temperature control system, including hearth, the hearth one end is connected burner, the other end is connected air outlet pipeline, the burner is connected natural gas pipeline by proportioning regulating valve, main air inlet pipe and auxiliary air inlet pipe are also set on hearth, main air inlet pipe and auxiliary air inlet pipe are connected main air blower and auxiliary air blower respectively, temperature sensor is provided on the air outlet pipeline, the proportioning regulating valve, main regulating valve, auxiliary regulating valve and temperature sensor are electrically connected with controller, the temperature signal sent by temperature sensor is received by the controller, and the action of proportioning regulating valve, main air blower and auxiliary air blower is controlled according to the signal.

[0005] Preferably, the controller includes an analysis control module, a PID control module and an air intake control module, and the analysis control module is electrically connected with the PID control module and the air intake control module.

[0006] Preferably, the analysis control module 111 receives the temperature signal sent by the temperature sensor, and after comparing with the preset upper and lower temperature thresholds, sends instructions to the PID control module and the air intake control module, the PID control module is electrically connected with the proportioning regulating valve, and the air intake control module is electrically connected with the main air blower and the auxiliary air blower.

[0007] Preferably, the main air intake duct and the auxiliary air intake duct are respectively connected to the main regulating valve and the auxiliary regulating valve.

[0008] Preferably, natural gas is introduced into the natural gas pipeline.

[0009] Preferably, air is introduced into the main air intake duct and the auxiliary air intake duct.

[0010] Preferably, the air outlet duct discharges high-temperature hot airflow.

[0011] The beneficial effects of this utility model are as follows: 1. The use of automated control can more accurately and stably control the temperature of the hot air discharged from the air outlet duct, thereby achieving the purpose of controlling the drying temperature. 2. The use of two air inlet ducts, a main air inlet duct and an auxiliary air inlet duct, allows for adjustment of the airflow rate according to the required firepower intensity. Attached Figure Description

[0012] Figure 1 This is a structural schematic diagram of Embodiment 1 of this utility model;

[0013] Figure 2 This is a structural schematic diagram of Embodiment 2 of this utility model;

[0014] Figure 3 This is an electrical connection block diagram of Embodiment 1.

[0015] Figure label:

[0016] 1. Furnace; 2. Burner; 3. Air outlet duct; 4. Proportional regulating valve; 5. Natural gas pipeline; 6. Main air intake duct; 7. Auxiliary air intake duct; 8. Main blower; 9. Auxiliary blower; 10. Temperature sensor; 11. Controller; 111. Analysis and control module; 112. PID control module; 113. Air intake control module. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to illustrate the structure of the present invention more clearly.

[0018] Example 1: As Figure 1 As shown, a temperature control system for a hot air furnace for drying aluminum hydroxide micro powder includes a furnace chamber 1. One end of the furnace chamber 1 is connected to a burner 2, and the other end is connected to an air outlet duct 3. The burner 2 is connected to a natural gas pipeline 5 through a proportional regulating valve 4. A main air inlet duct 6 and an auxiliary air inlet duct 7 are also provided on the furnace chamber 1. The main air inlet duct 6 and the auxiliary air inlet duct 7 are respectively connected to a main blower 8 and an auxiliary blower 9. A temperature sensor 10 is provided on the air outlet duct 3. The proportional regulating valve 4, the main blower 8, the auxiliary blower 9, and the temperature sensor 10 are all electrically connected to a controller 11.

[0019] In the system, natural gas from the natural gas pipeline and air from the main air inlet pipeline 6 are combusted in the furnace 1 under the action of the burner 2, and the high-temperature gas generated is discharged from the air outlet pipeline 3 into the drying chamber to dry the aluminum hydroxide powder. In order to accurately control the temperature of the high-temperature gas entering the air outlet pipeline 3, a temperature sensor 10 is arranged at the position of the air outlet pipeline 3 to send the collected temperature signal to the controller 11. The controller 11 receives the temperature signal sent by the temperature sensor 10 and controls the actions of the proportional regulating valve 4, the main air blower 8 and the auxiliary air blower 9 according to the signal.

[0020] The controller 11 includes an analysis control module 111, a PID control module 112 and an air inlet control module 113. The analysis control module 111 receives the temperature signal sent by the temperature sensor 10 and sends instructions to the PID control module 112 and the air inlet control module 113 after comparing with the preset upper and lower temperature thresholds. The PID control module 112 is electrically connected with the proportional regulating valve 4, and the air inlet control module 113 is electrically connected with the main air blower 8 and the auxiliary air blower 9.

[0021] Natural gas is introduced into the natural gas pipeline, air is introduced into the main air inlet pipeline 6 and the auxiliary air inlet pipeline 7, and high-temperature hot gas flow is discharged from the air outlet pipeline 3. The temperature of the high-temperature hot gas flow is mainly determined by the size of the fire in the furnace 1, and the size of the fire is affected by the flow rates of the natural gas and the air. Therefore, as shown in the figure, the controller 11 includes an analysis control module 111, a PID control module 112 and an air inlet control module 113 to control the flow rates of the natural gas and the air entering the furnace 1. Figure 3

[0022] The analysis control module receives the temperature signal sent by the temperature sensor 10 and compares it with the preset upper and lower temperature thresholds for analysis, and sends operation instructions to the PID control module 112 and the air inlet control module 113 according to the analysis results.

[0023] The PID control module 112 (proportional-integral-derivative control module) is a feedback control mechanism widely used in industrial control systems. It adjusts the control variable to make the output of the system reach the desired set value. The PID controller combines proportional (P), integral (I) and derivative (D) control actions to effectively address the steady-state error, dynamic response and stability problems of the system. The PID control module 112 is used in cooperation with the proportional regulating valve 4. When the PID control module 112 receives the temperature increase / decrease signal sent by the analysis control module, it increases / decreases the opening angle of the proportional regulating valve 4, thereby controlling the natural gas entering the furnace 1.

[0024] ​The air intake control module 113 works in conjunction with the main blower 8 and the auxiliary blower 9. The air intake control module 113 receives and analyzes the temperature rise / fall signals sent by the control module, controls the opening / closing of the main blower 8 and the auxiliary blower 9, and thus controls the air entering the furnace 1.

[0025] The working process of this utility model is as follows: Temperature sensor 10 measures the temperature of the hot air in the air duct 3 and feeds this temperature parameter back to the PID controller. After analysis and calculation, the PID controller controls the opening angle of the proportional regulating valve 4, thereby controlling the flow rate of natural gas into the burner 2, and thus controlling the firepower of the burner 2. When the temperature fed back by temperature sensor 10 is lower than the minimum preset temperature threshold, the PID controller controls the proportional regulating valve 4 to increase the opening angle, increasing the flow rate of natural gas into the burner 2, increasing the firepower of the burner 2, raising the temperature in the furnace 1, and raising the temperature of the hot air discharged from the air duct 3. When the temperature fed back by temperature sensor 10 is higher than the maximum preset temperature threshold, the PID controller controls the proportional regulating valve 4 to decrease the opening angle, decreasing the flow rate of natural gas into the burner 2, lowering the firepower of the burner 2, lowering the temperature in the furnace 1, and lowering the temperature of the hot air discharged from the air duct 3.

[0026] When the natural gas flow rate in burner 2 increases or decreases, it also needs to be coordinated with the flow rate of air entering the main air intake duct 6 and the auxiliary air intake duct 7. When the natural gas flow rate is increased, more air is needed to support combustion. The PID controller controls the auxiliary blower 9 to start or controls the auxiliary regulating valve to open, allowing more air to enter the furnace 1 through the auxiliary air intake duct 7 to support combustion with greater heat. Similarly, when the natural gas flow rate is decreased, less air is needed to support combustion. The PID controller controls the auxiliary blower 9 or controls the auxiliary regulating valve to reduce power or close, reducing or stopping the air entering the furnace 1 through the auxiliary air intake duct 7. This reduces the heat in the furnace 1 and lowers the temperature of the hot air in the outlet duct 3.

[0027] Generally, the main blower 8 or main regulating valve connected to the main air intake duct 6 is normally open. The PID controller adjusts the amount of air entering the furnace according to the received temperature signal. When the air entering the main air intake duct 6 cannot meet the combustion firepower of the furnace 1, the PID controller controls the auxiliary blower 9 or auxiliary regulating valve connected to the auxiliary air intake duct 7 to open.

[0028] Example 2: Figure 2 As shown, the difference from Embodiment 1 is that the main blower 8 and the auxiliary blower 9 are replaced with the main regulating valve and the auxiliary regulating valve, so that the main air inlet pipe 6 and the auxiliary air inlet pipe 7 are respectively connected to the main regulating valve and the auxiliary regulating valve.

[0029] In this embodiment, the air admission control module 113 is used in cooperation with the main regulating valve and the auxiliary regulating valve, the air admission control module 113 receives the temperature increase / decrease signal sent by the analysis control module, controls the opening / closing action of the main regulating valve and the auxiliary regulating valve, and then controls the air entering the furnace 1.

[0030] The above only describes the preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should be considered as the protection scope of the present application.

Claims

1. A temperature control system for a hot air furnace for drying aluminum hydroxide micro powder, comprising a furnace chamber, wherein one end of the furnace chamber is connected to a burner and the other end is connected to an air outlet duct, characterized in that: The burner is connected to a natural gas pipeline via a proportional control valve. A main air intake pipe and an auxiliary air intake pipe are also installed on the furnace, connecting to a main blower and an auxiliary blower, respectively. A temperature sensor is installed on the air outlet pipe. The proportional control valve, the main blower, the auxiliary blower, and the temperature sensor are all electrically connected to the controller. The controller receives temperature signals from the temperature sensor and controls the operation of the proportional control valve, the main blower, and the auxiliary blower based on these signals.

2. The temperature control system for a hot air furnace for drying aluminum hydroxide micropowder according to claim 1, characterized in that: The controller includes an analysis control module, a PID control module, and an air intake control module, and the analysis control module is electrically connected to the PID control module and the air intake control module, respectively.

3. The temperature control system for a hot air furnace for drying aluminum hydroxide micro powder according to claim 2, characterized in that: The analysis and control module receives the temperature signal sent by the temperature sensor, compares it with the preset upper and lower temperature thresholds, and then sends instructions to the PID control module and the air supply control module. The PID control module is electrically connected to the proportional regulating valve, while the air supply control module is electrically connected to the main blower and the auxiliary blower.

4. The temperature control system for a hot air furnace for drying aluminum hydroxide micro powder according to claim 3, characterized in that: The main air intake duct and the auxiliary air intake duct are respectively connected to the main regulating valve and the auxiliary regulating valve.

5. The temperature control system for a hot air furnace for drying aluminum hydroxide micro powder according to claim 4, characterized in that: The air intake control module is electrically connected to the main regulating valve and the auxiliary regulating valve.

6. The temperature control system for a hot air furnace for drying aluminum hydroxide micro powder according to claim 1, characterized in that: Natural gas is introduced into the natural gas pipeline.

7. The temperature control system for a hot air furnace for drying aluminum hydroxide micro powder according to claim 1, characterized in that: Air is introduced into the main air intake duct and the auxiliary air intake duct.

8. The temperature control system for a hot air furnace for drying aluminum hydroxide micro powder according to claim 1, characterized in that: The air outlet duct discharges high-temperature hot airflow.

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