Auxiliary device of oxygen-enriched combustor

Abstract

The utility model discloses an auxiliary device of an oxygen-enriched combustor in the technical field of combustors. The auxiliary device comprises a mixing box, a feeding mechanism, a draught fan and a control system. A discharging opening is formed in the mixing box and is communicated with a discharging pipe; the feeding mechanism comprises a feeding pipe, the feeding pipe is communicated with the interior of the mixing box, a motor is fixed to the other end of the feeding pipe, a screw rod is fixed to an output shaft of the motor, and the screw rod is located in the feeding pipe; the feeding pipe is communicated with a vertical feeding pipe, and the top of the feeding pipe is communicated with a hopper; the fan is fixedly connected to the mixing box, and an air outlet of the fan penetrates through the mixing box to be communicated with the interior of the mixing box; the control system comprises a controller and a control switch, the controller is in electric signal connection with the motor and the fan, the control switch is in electric signal connection with the controller, and the control switch is used for controlling starting, stopping and rotating speed of the motor and the fan. The scheme is used for adjusting the mixing proportion of pulverized coal and air when the pulverized coal introduced into the combustor cannot be fully combusted.

Description

Technical Field

[0001] The utility model relates to the technical field of burners, in particular to an auxiliary device of an oxygen-enriched burner. Background Art

[0002] As one of the important building materials, cement is in huge demand worldwide. During the cement processing, a burner is needed to calcine the cement raw material at high temperature to form cement clinker with calcium silicate as the main component. However, if the current burner has low oxygen flow and incomplete combustion of coal powder during the cement production process, a large amount of pollutants will be discharged, which will have a serious impact on the environment. During the use of the burner, coal powder and air need to be mixed and passed into the burner to ensure that the coal powder can burn. However, when there is too much coal powder, the oxygen content in the air is not enough to support the complete combustion of the coal powder, which will lead to a large amount of nitrogen oxides. This will seriously pollute the surrounding environment when the exhaust gas is discharged. Therefore, in order to reduce the generation of nitrogen oxides and ensure the full combustion of coal powder in the burner, an auxiliary device for oxygen-enriched burners is urgently needed to adjust the mixing ratio of coal powder and air. Utility Model Content

[0003] The utility model aims to provide an auxiliary device for an oxygen-enriched burner, which is used for adjusting the mixing ratio of coal powder and air when the coal powder introduced into the burner cannot be fully burned.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: an auxiliary device for an oxygen-enriched burner, comprising a mixing box, a feeding mechanism, a fan and a control system; a discharge port is provided on one side wall of the mixing box, the discharge port is connected to a discharge pipe, and one end of the discharge pipe away from the discharge port is connected to a coal powder feed port of the burner;

[0005] The feeding mechanism comprises a horizontal feeding pipe, one end of which passes through a mixing box and is connected to the inside of the mixing box, the other end of the feeding pipe is fixedly connected to a motor, a screw rod is fixedly connected to the output shaft of the motor, the screw rod is located in the feeding pipe, the central axis of the screw rod is coaxial with the central axis of the feeding pipe, and the end of the screw rod extends to the end of the feeding pipe; a vertical feeding pipe is connected to the feeding pipe, and a hopper is connected to the top of the feeding pipe;

[0006] The fan is fixedly connected to the mixing box, and the air outlet of the fan passes through the mixing box and communicates with the interior of the mixing box;

[0007] The control system includes a controller and a control switch. The controller is connected to the motor and the fan by electrical signals. The control switch is connected to the controller by electrical signals. The control switch is used to control the start and stop and the rotation speed of the motor and the fan respectively.

[0008] The working principle of the utility model is as follows: when in use, first add the coal powder into the hopper, and after the coal powder enters the hopper, it falls into the feeding pipe through the feeding pipe under the action of gravity. At this time, the motor and the fan are started synchronously by the control switch. When the motor is running, the output shaft drives the screw rod to rotate. Since the screw rod is located in the feeding pipe and is notified with the central axis of the feeding pipe and the end of the screw rod extends to the end of the feeding pipe, and the feeding pipe is connected with the mixing box, when the screw rod rotates, the screw rod pushes the coal powder into the mixing box by the push of the spiral blades during rotation; and when the fan is running, air is introduced into the mixing box through the air outlet. In the mixing box, the coal powder is mixed with the air under the action of the air flow generated by the air flow. As the air pressure in the mixing box is greater than the external pressure, the air mixed with the coal powder in the mixing box flows into the discharge pipe along the discharge port of the mixing box, and then enters the burner through the discharge pipe. If the pulverized coal cannot be fully burned after entering the burner, resulting in excessive exhaust gas, the control switch can be used to transmit the control signal to the controller, and then the controller can control the fan to increase the speed, thereby increasing the amount of air introduced to increase the amount of oxygen, so that the pulverized coal can be fully burned. If the amount of pulverized coal introduced is too much, the control switch can be used to transmit the control signal to the controller, and the controller can control the motor speed to reduce the speed, thereby slowing down the speed of the screw rod, and reducing the amount of pulverized coal pushed into the mixing box by the screw rod.

[0009] The beneficial effects of the utility model are as follows: 1. This scheme controls the rotation speed of the motor and the fan through the control switch in cooperation with the controller. When it is necessary to control the amount of coal powder introduced, the control switch adjusts the rotation speed of the motor to achieve the purpose of controlling the rotation speed of the screw rod. When it is necessary to reduce the amount of coal powder introduced, the motor speed is reduced. In this way, the rotation speed of the screw rod slows down, and the speed at which the coal powder is pushed to move is also slowed down synchronously, so that the amount of coal powder introduced can be effectively and accurately adjusted.

[0010] 2. By adjusting the speed of the fan, the amount of air introduced can be effectively controlled. At the same time, the amount of coal powder delivered to the burner can be adjusted by the wind force of the fan. At the same time, it can also ensure that the air introduced is sufficient to ensure the full combustion of the coal powder.

[0011] Furthermore, the feeding pipe penetrates into one end of the mixing box and penetrates into the mixing box from the top of the mixing box wall. The purpose is to facilitate the coal powder to fall from the high place of the mixing box after entering the mixing box from the feeding pipe, which is conducive to the coal powder being fully driven by the airflow to be dispersed during the falling process, avoiding the accumulation of coal powder and affecting the uniformity of its mixing with air.

[0012] Furthermore, the air outlet of the fan is located directly below the feed pipe. The purpose is that, through this arrangement, the wind blown by the fan can blow away the coal powder that falls from the feed pipe.

[0013] Furthermore, the motor is a stepper motor, which is used to facilitate the adjustment of the motor speed.

[0014] Furthermore, the fan is a variable frequency fan, and the purpose is that this arrangement is convenient for adjusting the wind force of the fan.

[0015] Furthermore, the outer edge of the spiral blade of the spiral rod is in sliding contact with the inner wall of the feed pipe. The purpose is that this arrangement is to facilitate the pushing of coal powder and to effectively prevent coal powder from adhering to the top of the feed pipe, and the inner wall of the feed pipe can be scraped and cleaned by the rotation of the spiral rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a structural schematic diagram of an auxiliary device of an oxygen-enriched burner. DETAILED DESCRIPTION

[0017] The following is further described in detail through specific implementation methods:

[0018] The reference numerals in the drawings of the specification include: hopper 1, feed pipe 2, motor 3, screw rod 4, feed pipe 5, fan 6, air outlet 7, mixing box 8, discharge pipe 9.

[0019] The embodiment is basically as shown in the attached Figure 1 As shown:

[0020] An auxiliary device for an oxygen-enriched burner comprises a mixing box 8, a feeding mechanism, a fan 6 (variable frequency fan) and a control system; the right side wall of the mixing box 8 is configured in a constricted shape, a discharge port is provided at the center of the right side wall, a discharge pipe 9 is connected to the discharge port, and one end of the discharge pipe 9 away from the discharge port is connected to the coal powder feed port of the burner.

[0021] The feeding mechanism includes a horizontal feeding pipe 5, the discharge end of which passes through the top of the box wall on the left side of the mixing box 8 and is connected to the inside of the mixing box 8, the other end of the feeding pipe 5 is fixedly connected to a motor 3 (stepping motor), and a screw rod 4 is fixedly connected to the output shaft of the motor 3, the screw rod 4 is located in the feeding pipe 5, the central axis of the screw rod 4 is coaxial with the central axis of the feeding pipe 5, and the end of the screw rod 4 extends to the end of the feeding pipe 5, and the outer edge of the spiral blade of the screw rod 4 is in sliding contact with the inner wall of the feeding pipe 5; a vertical feeding pipe 2 is connected to the feeding pipe 5, and the top of the feeding pipe 2 is connected to the hopper 1.

[0022] The fan 6 is fixedly connected to the mixing box 8 , and the air outlet 7 of the fan 6 passes through the mixing box 8 and is communicated with the interior of the mixing box 8 , and the air outlet 7 of the fan 6 is located directly below the feeding pipe 5 .

[0023] The control system includes a controller (single-chip microcomputer) and a control switch. The controller is electrically connected to the motor 3 and the fan 6. The control switch is electrically connected to the controller. The control switch includes a fan 6 switch button, a fan 6 acceleration button, a fan 6 deceleration button, a motor 3 switch button, a motor 3 acceleration button and a motor 3 deceleration button.

[0024] The specific implementation process is as follows:

[0025] When in use, first add coal powder into the hopper 1. After the coal powder enters the hopper 1, it falls into the feeding pipe 5 through the feeding pipe 2 under the action of gravity. At this time, the motor 3 and the fan 6 are started synchronously by the control switch. When the motor 3 is running, the output shaft drives the screw rod 4 to rotate. Since the screw rod 4 is located in the feeding pipe 5 and is notified with the central axis of the feeding pipe 5 and the end of the screw rod 4 extends to the end of the feeding pipe 5, and the feeding pipe 5 is connected to the mixing box 8, when the screw rod 4 rotates, the screw rod 4 relies on the push of the spiral blades during rotation to push the coal powder into the mixing box 8; and when the fan 6 is running, air is introduced into the mixing box 8 through the air outlet 7. In the mixing box 8, when the coal powder falls from the feed pipe 5 to the air outlet 7, the coal powder is mixed with the air under the action of the air flow generated by the air flow. As the air pressure in the mixing box 8 is greater than the external pressure, the air mixed with the coal powder in the mixing box 8 flows into the discharge pipe 9 along the discharge port of the mixing box 8, and then enters the burner through the discharge pipe 9. If the coal powder cannot be fully burned after entering the burner, resulting in excessive exhaust gas, the control signal can be transmitted to the controller through the control switch, and then the controller controls the fan 6 to increase the speed, thereby increasing the amount of air introduced to increase the amount of oxygen, so that the coal powder can be fully burned. If it is because the amount of coal powder introduced is too much, the control signal is transmitted to the controller through the control switch, and the controller controls the speed of the motor 3 to decrease, thereby slowing down the speed of the screw rod 4, and reducing the amount of coal powder pushed into the mixing box 8 by the screw rod 4 by reducing the rotation speed of the screw rod 4.

Claims

1. An auxiliary device for an oxygen-enriched burner, characterized in that: It includes a mixing box, a feeding mechanism, a fan and a control system; a discharge port is provided on one side wall of the mixing box, the discharge port is connected to a discharge pipe, and one end of the discharge pipe away from the discharge port is connected to the coal powder feed port of the burner; The feeding mechanism comprises a horizontal feeding pipe, one end of which passes through a mixing box and is connected to the inside of the mixing box, the other end of the feeding pipe is fixedly connected to a motor, a screw rod is fixedly connected to the output shaft of the motor, the screw rod is located in the feeding pipe, the central axis of the screw rod is coaxial with the central axis of the feeding pipe, and the end of the screw rod extends to the end of the feeding pipe; a vertical feeding pipe is connected to the feeding pipe, and a hopper is connected to the top of the feeding pipe; The fan is fixedly connected to the mixing box, and the air outlet of the fan passes through the mixing box and communicates with the interior of the mixing box; The control system includes a controller and a control switch. The controller is connected to the motor and the fan by electrical signals. The control switch is connected to the controller by electrical signals. The control switch is used to control the start and stop and the rotation speed of the motor and the fan respectively.

2. The auxiliary device of an oxygen-enriched burner according to claim 1, characterized in that: One end of the feed pipe penetrates into the mixing box and penetrates into the mixing box from the top of the box wall of the mixing box.

3. The auxiliary device of an oxygen-enriched burner according to claim 2, characterized in that: The air outlet of the fan is located directly below the feeding pipe.

4. The auxiliary device of an oxygen-enriched burner according to claim 3, characterized in that: The motor is a stepper motor.

5. The auxiliary device of an oxygen-enriched burner according to claim 4, characterized in that: The fan is a variable frequency fan.

6. The auxiliary device of an oxygen-enriched burner according to claim 5, characterized in that: The outer edge of the spiral blade of the spiral rod is in sliding contact with the inner wall of the feeding pipe.

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