Gas flow control device of kiln and kiln

Abstract

The utility model relates to the technical field of kilns, in particular to an air flow control device of a kiln and the kiln, and the air flow control device of the kiln comprises an air conveying main pipe, a fuel gas conveying main pipe, a burner and a flow master controller, the air conveying main pipe and the fuel gas conveying main pipe are respectively connected with a flow adjusting mechanism used for adjusting the flow of gas introduced into the burner, each flow adjusting mechanism comprises a conveying branch pipe, and the gas inlet end of each conveying branch pipe is connected with the air conveying main pipe or the fuel gas conveying main pipe. The gas outlet end of the conveying branch pipe is connected with the burner, and a switch control valve used for controlling opening and closing of the gas inlet end, a flow monitoring assembly used for monitoring flow and a linear flow adjusting valve used for adjusting the flow are sequentially arranged on the conveying branch pipe in the fluid conveying direction from the gas inlet end to the gas outlet end. The flow monitoring assembly and the linear flow adjusting valve on each flow adjusting mechanism are respectively connected with the flow master controller, the air flow control device can effectively improve the precision of air and gas flow control, and then the control precision of the air-fuel ratio is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of kilns, in particular to a gas flow control device for a kiln and a kiln. Background Art

[0002] At present, combustion kilns are still widely used. With the increasingly severe form of energy crisis, energy conservation and emission reduction are the trends of industrial design and development. In order to make the combustion in the kiln (combustion furnace) more complete and release the most heat from the effective fuel, the air-fuel ratio must be accurately controlled within a certain range. However, in the prior art, usually, the opening degree of a control valve is adjusted to regulate the flow rates of combustible gas and air (auxiliary combustion air). The control accuracy of this air-fuel ratio is low and is not sufficient to quantitatively control the air-fuel ratio of air and combustible gas. When the air-fuel ratio is not properly controlled, for example, when the proportion of air introduced is too large, it is easy to cause the temperature in the high-temperature area of the kiln to be unstable and lead to more heat being discharged outside the kiln with the flue gas. When the proportion of air introduced is too small, it is easy to cause incomplete combustion. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a gas flow control device for a kiln and a kiln aiming at the existing technical status. The gas flow control device of the utility model can effectively improve the control accuracy of the air and gas flow rates, and further improve the control accuracy of the air-fuel ratio.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] The utility model discloses a gas flow control device for a kiln, which includes an air delivery main pipe, a gas delivery main pipe and a burner, and further includes a flow main controller. Each of the air delivery main pipe and the gas delivery main pipe is connected with a flow regulation mechanism for regulating the gas flow rate into the burner.

[0006] The flow regulation mechanism includes a delivery branch pipe. The intake end of the delivery branch pipe is connected with the air delivery main pipe or the gas delivery main pipe, and the outlet end of the delivery branch pipe is connected with the burner. Along the fluid delivery direction from the intake end to the outlet end of the delivery branch pipe, a switch control valve for controlling the opening and closing of the intake end, a flow monitoring component for monitoring the flow rate and a linear flow regulating valve for regulating the flow rate are successively arranged. The flow monitoring component and the linear flow regulating valve on each flow regulation mechanism are respectively connected with the flow main controller.

[0007] In some embodiments, the flow regulation mechanism includes an air flow regulation mechanism and a gas flow regulation mechanism. The burner is provided with an air inlet and a gas inlet. The air flow regulation mechanism is respectively connected with the air delivery main pipe and the air inlet, and the gas flow regulation mechanism is respectively connected with the gas delivery main pipe and the gas inlet.

[0008] In some embodiments, the flow monitoring component includes an elbow sensor, a differential pressure guide pipe, and a differential pressure transmitter. The elbow sensor is connected to the differential pressure transmitter through the differential pressure guide pipe, and the differential pressure transmitter is connected to the flow main controller.

[0009] In some embodiments, the delivery branch pipe includes a first pipe section and a second pipe section. The first pipe section is arranged between the switching control valve and the flow monitoring component, and the second pipe section is arranged between the flow monitoring component and the linear flow regulating valve. The length of the first pipe section is at least five times the diameter of the first pipe section, and the length of the second pipe section is at least twice the diameter of the second pipe section.

[0010] In some embodiments, a flow splitting component is further arranged between the flow regulating mechanism and the burner. The flow splitting component includes a main flow splitting pipe and lateral flow splitting pipes that can communicate with each other. The gas outlet end of the delivery branch pipe is connected to the main flow splitting pipe. The lateral flow splitting pipes are arranged at both ends in the axial direction of the main flow splitting pipe. On one side of the two lateral flow splitting pipes close to each other, flow splitting branch pipes are provided. One end of each flow splitting branch pipe away from the lateral flow splitting pipe is connected to the burner.

[0011] In some embodiments, the flow splitting component includes an air flow splitting component and a gas flow splitting component. The main flow splitting pipes of the air flow splitting component and the gas flow splitting component are parallel to each other.

[0012] In some embodiments, at least two groups of flow splitting branch pipes are correspondingly arranged on each lateral flow splitting pipe, and the number of burners corresponds to the number of flow splitting branch pipes.

[0013] In some embodiments, the switching control valve is a manual butterfly valve.

[0014] The present utility model also discloses a kiln, including the gas flow control device of the above-mentioned kiln.

[0015] The beneficial effects of the present utility model are as follows:

[0016] In the present utility model, on the one hand, by providing a flow rate regulating mechanism (hereinafter referred to as "air flow rate regulating mechanism") between the main air conveying pipe and the burner for independently regulating the air flow rate into the burner, and a flow rate regulating mechanism (hereinafter referred to as "gas flow rate regulating mechanism") between the main gas conveying pipe and the burner for independently regulating the gas flow rate into the burner, the air flow rate and the gas flow rate are independently regulated respectively; on the other hand, in the air flow rate regulating mechanism and the gas flow rate regulating mechanism, the switch control valve, the flow rate monitoring component and the linear flow rate regulating valve are arranged along the fluid conveying direction from the intake end to the outlet end of the conveying branch pipe. Thus, after the switch control valve is opened, air / gas is conveyed from the main air conveying pipe / main gas conveying pipe through the intake end of the conveying branch pipe to the outlet end of the conveying branch pipe. During the process of air / gas being conveyed from the intake end to the outlet end of the conveying branch pipe, it first passes through the flow rate monitoring component. The flow rate monitoring component detects the gas flow rate of the flowing air / gas in real time and feeds it back to the main flow rate controller. After receiving the information fed back by the flow rate monitoring component, the main flow rate controller controls the linear flow rate regulating valve to adjust the valve flux, thereby ensuring that the gas flow rate of the air / gas into the burner reaches the preset range. Therefore, through the independent regulation of the air flow rate and the gas flow rate respectively and the mutual cooperation between the switch control valve, the flow rate monitoring component and the linear flow rate regulating valve in each flow rate regulating mechanism and the main flow rate controller, the accuracy of air and gas flow rate control is effectively improved, and then the control accuracy of the air-fuel ratio is improved to ensure sufficient combustion in the kiln, reduce energy consumption and avoid energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural view of the gas flow rate control device of the kiln of the present utility model.

[0018] Figure 2 is a side view of the gas flow rate control device of the kiln of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present utility model will be further described below in conjunction with the drawings and embodiments:

[0020] Please refer to Figure 1 - Figure 2 as shown. The present utility model discloses a gas flow rate control device for a kiln, which includes a main air conveying pipe 1, a main gas conveying pipe 2 and a burner 3, and further includes a main flow rate controller (not shown). Each of the main air conveying pipe 1 and the main gas conveying pipe 2 is connected with a flow rate regulating mechanism 4 for regulating the gas flow rate into the burner 3.

[0021] The flow rate regulating mechanism 4 includes a delivery branch pipe 41. The intake end of the delivery branch pipe 41 is connected to the air delivery main pipe 1 or the gas delivery main pipe 2, and the outlet end of the delivery branch pipe 41 is connected to the burner 3. Along the fluid delivery direction from the intake end towards the outlet end of the delivery branch pipe 41, a switch control valve 42 for controlling the opening and closing of the intake end, a flow rate monitoring assembly 43 for monitoring the flow rate, and a linear flow rate regulating valve 44 for regulating the flow rate are successively provided on the delivery branch pipe 41. The flow rate monitoring assembly 43 and the linear flow rate regulating valve 44 on each flow rate regulating mechanism 4 are respectively connected to the flow rate main controller.

[0022] In this embodiment, on the one hand, by providing a flow rate regulating mechanism 4 (hereinafter referred to as "air flow rate regulating mechanism 4A") that can independently regulate the air flow rate introduced into the burner 3 between the air delivery main pipe 1 and the burner 3, and a flow rate regulating mechanism 4 (hereinafter referred to as "gas flow rate regulating mechanism 4B") that can independently regulate the gas flow rate introduced into the burner 3 between the gas delivery main pipe 2 and the burner 3, the air flow rate and the gas flow rate are independently regulated respectively. On the other hand, in the air flow rate regulating mechanism 4A and the gas flow rate regulating mechanism 4B, the switch control valve 42, the flow rate monitoring assembly 43, and the linear flow rate regulating valve 44 are arranged along the fluid delivery direction from the intake end towards the outlet end of the delivery branch pipe 41. Thus, after the switch control valve 42 is opened, air / gas is delivered from the air delivery main pipe 1 / gas delivery main pipe 2 through the intake end of the delivery branch pipe 41 to the outlet end of the delivery branch pipe 41. During the process of air / gas being delivered from the intake end to the outlet end of the delivery branch pipe 41, it first passes through the flow rate monitoring assembly 43. The flow rate monitoring assembly 43 detects the gas flow rate of the flowing air / gas in real time and feeds it back to the flow rate main controller. After receiving the information fed back by the flow rate monitoring assembly 43, the flow rate main controller controls the linear flow rate regulating valve 44 to adjust the valve flux, thereby ensuring that the gas flow rate of the air / gas introduced into the burner 3 reaches the preset range. Thus, through the independent regulation of the air flow rate and the gas flow rate respectively and the mutual cooperation between the switch control valve 42, the flow rate monitoring assembly 43, and the linear flow rate regulating valve 44 within each flow rate regulating mechanism 4 and the flow rate main controller, the accuracy of air and gas flow rate control is effectively improved, and then the control accuracy of the air-fuel ratio is improved to ensure sufficient combustion of the kiln furnace, reduce energy consumption, and avoid energy waste.

[0023] See Figure 1 As shown, the flow rate regulating mechanism 4 includes an air flow rate regulating mechanism 4A and a gas flow rate regulating mechanism 4B. The burner 3 is provided with an air inlet and a gas inlet. The air flow rate regulating mechanism 4A is respectively connected to the air delivery main pipe 1 and the air inlet, and the gas flow rate regulating mechanism 4B is respectively connected to the gas delivery main pipe 2 and the gas inlet.

[0024] The air flow and gas flow are independently regulated through the air flow regulating mechanism 4A and the gas flow regulating mechanism 4B, which is conducive to improving the accuracy of air and gas flow control.

[0025] See Figure 1 As shown, the flow monitoring component 43 includes an elbow sensor 431, a differential pressure guide pipe 432, and a differential pressure transmitter 433. The elbow sensor 431 is connected to the differential pressure transmitter 433 through the differential pressure guide pipe 432, and the differential pressure transmitter 433 is connected to the flow main controller. Among them, one end of the differential pressure guide pipe 432 is connected to the pressure tapping port of the elbow sensor 431, and the other end is connected to the differential pressure transmitter 433. Compared with conventional flow meters, the present utility model uses the elbow sensor 431 combined with the differential pressure transmitter 433 to detect the air and gas flow rates, and the detection accuracy is higher.

[0026] See Figure 1 As shown, the delivery branch pipe 41 includes a first pipe section 411 and a second pipe section 412. The first pipe section 411 is arranged between the switch control valve 42 and the flow monitoring component 43, and the second pipe section 412 is arranged between the flow monitoring component 43 and the linear flow regulating valve 44. The length of the first pipe section 411 is at least five times the diameter of the first pipe section 411, and the length of the second pipe section 412 is at least twice the diameter of the second pipe section 412.

[0027] During the process of air / gas being delivered from the inlet end of the delivery branch pipe 41 to the outlet end of the delivery branch pipe 41, the air flow sequentially passes through the switch control valve 42, the first pipe section 411, the flow monitoring component 43, the second pipe section 412, and the linear flow regulating valve 44. Since the air flow rate is unstable at the initial stage of the air flow being delivered from the main delivery pipe to the delivery branch pipe 41 and near the linear flow regulating valve 44, it is easy to cause a large error in the flow detection of the flow monitoring component 43, affecting the detection accuracy. After testing, when the length of the first pipe section 411 is at least five times the diameter of the first pipe section 411 and the length of the second pipe section 412 is at least twice the diameter of the second pipe section 412, it can ensure that the air flow rate near the flow monitoring component 43 is relatively stable, ensure the detection accuracy, and thus ensure the accuracy of air / gas flow regulation.

[0028] See Figure 1 and Figure 2As shown in the figure, a flow splitting assembly 5 is further provided between the flow regulating mechanism 4 and the burner 3. The flow splitting assembly 5 includes a main flow splitting pipe 51 and lateral flow splitting pipes 52 that can communicate with each other. The gas outlet end of the conveying branch pipe 41 is connected to the main flow splitting pipe 51. The lateral flow splitting pipes 52 are arranged at both ends in the axial direction of the main flow splitting pipe 51. On one side of the two lateral flow splitting pipes 52 close to each other, there are flow splitting branch pipes 53. One end of each flow splitting branch pipe 53 away from the lateral flow splitting pipe 52 is connected to the burner 3. Specifically, the flow splitting assembly 5 includes an air flow splitting assembly 5A and a gas flow splitting assembly 5B. The air flow splitting assembly 5A is respectively connected to the air flow regulating mechanism 4A and the air inlet of the burner 3, and the gas flow splitting assembly 5B is respectively connected to the gas flow regulating mechanism 4B and the gas inlet of the burner 3.

[0029] After the air / gas is regulated by the flow regulating mechanism 4, it is split by the flow splitting assembly 5. Specifically, it flows through the main flow splitting pipe 51 to the lateral flow splitting pipes 52 at both ends in sequence, and then flows through the lateral flow splitting pipes 52 to the flow splitting branch pipes 53, splitting the air flow to each burner 3, and then spraying it into the kiln through each burner 3.

[0030] Through the setting of the flow splitting assembly 5, the uniformity of the air / gas introduced into the kiln is improved, which is beneficial to the uniform distribution of the temperature inside the kiln and full combustion.

[0031] See Figure 1 and Figure 2 As shown in the figure, the flow splitting assembly 5 includes an air flow splitting assembly 5A and a gas flow splitting assembly 5B. The main flow splitting pipe 51 of the air flow splitting assembly 5A is parallel to the main flow splitting pipe 51 of the gas flow splitting assembly 5B, and the overall integration degree of the device is higher.

[0032] See Figure 1 and Figure 2 As shown in the figure, at least two groups of flow splitting branch pipes 53 are correspondingly arranged on each lateral flow splitting pipe 52, and the number of burners 3 corresponds to the number of flow splitting branch pipes 53. In this embodiment, three groups of flow splitting branch pipes 53 are correspondingly arranged on each lateral flow splitting pipe 52. Among them, the three groups of flow splitting branch pipes 53 are correspondingly connected to three groups of burners 3 one by one. The air inlet on the same burner 3 is connected to the flow splitting branch pipe 53 on the air flow splitting assembly 5A, and the gas inlet is connected to the flow splitting branch pipe 53 on the gas flow splitting assembly 5B.

[0033] The switch control valve 42 is a manual butterfly valve.

[0034] The present utility model also discloses a kiln, including the gas flow control device of the above-mentioned kiln.

[0035] Of course, the above drawings are only the preferred embodiments of the present utility model, and are not used to limit the scope of use of the present utility model. Therefore, all equivalent changes made on the principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. An air flow control device for a kiln, comprising a main air delivery pipe, a main gas delivery pipe and a burner, characterized in that, It further includes a flow master controller. The main air delivery pipe and the main gas delivery pipe are each connected with a flow regulating mechanism for regulating the gas flow rate into the burner. The flow regulating mechanism includes a delivery branch pipe. The intake end of the delivery branch pipe is connected to the main air delivery pipe or the main gas delivery pipe, and the outlet end of the delivery branch pipe is connected to the burner. Along the fluid delivery direction from the intake end to the outlet end of the delivery branch pipe, a switch control valve for controlling the opening and closing of the intake end, a flow monitoring component for monitoring the flow rate, and a linear flow regulating valve for regulating the flow rate are sequentially provided. The flow monitoring component and the linear flow regulating valve on each flow regulating mechanism are respectively connected to the flow master controller.

2. The gas flow control device of the kiln according to claim 1, characterized in that The flow regulating mechanism includes an air flow regulating mechanism and a gas flow regulating mechanism. The burner is provided with an air inlet and a gas inlet. The air flow regulating mechanism is respectively connected to the main air delivery pipe and the air inlet, and the gas flow regulating mechanism is respectively connected to the main gas delivery pipe and the gas inlet.

3. The gas flow control device of the kiln according to claim 1, characterized in that The flow monitoring component includes an elbow sensor, a differential pressure guide pipe, and a differential pressure transmitter. The elbow sensor is connected to the differential pressure transmitter through the differential pressure guide pipe, and the differential pressure transmitter is connected to the flow master controller.

4. The gas flow control device of the kiln according to claim 1, characterized in that, The delivery branch pipe includes a first pipe section and a second pipe section. The first pipe section is arranged between the switch control valve and the flow monitoring component, and the second pipe section is arranged between the flow monitoring component and the linear flow regulating valve. The length of the first pipe section is at least five times the diameter of the first pipe section, and the length of the second pipe section is at least two times the diameter of the second pipe section.

5. The gas flow control device of the kiln according to claim 1, characterized in that, A flow splitting component is further provided between the flow regulating mechanism and the burner. The flow splitting component includes a flow splitting main pipe and lateral flow splitting pipes that can communicate with each other. The outlet end of the delivery branch pipe is connected to the flow splitting main pipe. The lateral flow splitting pipes are arranged at both ends in the axial direction of the flow splitting main pipe. On one side of the two lateral flow splitting pipes close to each other, flow splitting branch pipes are provided. One end of each flow splitting branch pipe away from the lateral flow splitting pipe is connected to the burner.

6. The gas flow control device of the kiln according to claim 5, characterized in that, The flow splitting component includes an air flow splitting component and a gas flow splitting component. The flow splitting main pipes of the air flow splitting component and the gas flow splitting component are parallel to each other.

7. The gas flow control device of the kiln according to claim 5, characterized in that, At least two groups of flow splitting branch pipes are correspondingly provided on each lateral flow splitting pipe, and the number of burners corresponds to the number of flow splitting branch pipes.

8. The gas flow control device of the kiln according to claim 1, characterized in that, The switch control valve is a manual butterfly valve.

9. A kiln, characterized in that, It includes a gas flow control device for a kiln furnace according to any one of claims 1 to 8.

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