A natural gas quantitative control system for a float glass production line

Abstract

The present invention provides a natural gas quantitative control system for a float glass production line, which belongs to the technical field of float glass production equipment. It includes a main pipe and several branch pipes connected in parallel with the main pipe. A control valve is arranged on the branch pipe. The control valve includes a mounting frame, a tubular valve body, a control motor, a rotating shaft and a rotary valve outside the rotating shaft. The rotary valve is a spiral guide plate arranged on the outer wall of the rotating shaft. The side wall of the valve body is respectively provided with an air inlet joint and an air outlet joint. The air inlet joint is connected to the upper end of the inner cavity of the valve body, and the air outlet joint is connected to the upper end of the valve body. The rotating shaft is fixedly connected to the output shaft of the control motor. The rotary valve is rotatably connected in the valve body. The air inlet joint is connected to the main pipe, and the air outlet joint is connected to the air outlet end of the branch pipe. The housing of the control motor and the valve body are both fixed on the mounting frame; a pressure sensor is arranged on the branch pipe near one end of the air outlet joint. The present invention has the advantages of being able to improve the control accuracy of the gas transmission pressure of each branch pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of float glass production equipment and relates to a natural gas quantitative control system for a float glass production line. Background Art

[0002] The melting furnace is one of the three major thermal equipment in float glass production equipment. The melting process of the melting furnace requires a large amount of natural gas as the combustion medium. The cost of natural gas accounts for nearly 1 / 3 of the total cost of glass enterprises. Saving the cost of natural gas is a major thorny issue in the current industry.

[0003] Since natural gas statistical metering is a full-line metering method and cannot be measured in different areas, the accuracy of individual control of each lance is low. In particular, the temperature control of the edge lances in the production process of ultra-thick glass has a great impact on the forming of the glass. Although the temperature of the area can be monitored by the temperature sensor at the corresponding part of the lance, and then the natural gas intake pressure (i.e. intake volume) can be reversely controlled, the timeliness of this control process is poor. In addition, any change in the flow rate of any branch pipe will affect the outlet pressure of the natural gas main of the kiln, and the gas pressure of the gas main will affect the intake pressure of other branches, so that the gas pressure of each branch also needs to be regulated in real time; because the flow rates of each branch interfere with each other and the flow rates of each branch need to be accurately controlled, the existing full-line metering control method not only has low temperature control accuracy, but also has problems such as natural gas waste and inability to monitor regional usage, making the natural gas usage in each area unable to be used as a reference indicator for improving the glass production process. Summary of the invention

[0004] The purpose of the present invention is to provide a natural gas quantitative control system for a float glass production line in view of the above problems existing in the prior art. The technical problem to be solved by the present invention is how to accurately control the outlet gas pressure of the branch pipe.

[0005] The object of the present invention can be achieved through the following technical solutions: A natural gas quantitative control system for a float glass production line, characterized in that it includes a main pipe and a plurality of branch pipes connected in parallel with the main pipe, a control valve is arranged on the branch pipe, the control valve includes a mounting frame, a tubular valve body, a control motor, a rotating shaft and a rotary valve outside the rotating shaft, the rotary valve is a spiral guide plate arranged on the outer wall of the rotating shaft, and an air inlet joint and an air outlet joint are respectively arranged on the side walls of the valve body, the air inlet joint is connected to the upper end of the inner cavity of the valve body, and the air outlet joint is connected to the lower end of the valve body, the rotating shaft is fixedly connected to the output shaft of the control motor, the rotary valve is rotatably connected in the valve body, the air inlet joint is connected to the main pipe, and the air outlet joint is connected to the air outlet end of the branch pipe, and the housing of the control motor and the valve body are both fixed on the mounting frame; a pressure sensor is arranged on the branch pipe near one end of the air outlet joint.

[0006] Furthermore, the rotating shaft includes a first half-shaft connected to one end of the output shaft of the control motor and a second half-shaft connected to the first half-shaft, the lower end of the first half-shaft has a plug, the upper end of the second half-shaft has a plug, the plug is rotatably connected in the plug, and a torsion spring is connected between the plug and the plug; the guide plate includes an upper half connected to the first half-shaft and a lower half connected to the second half-shaft.

[0007] The control motor rotates to rotate the guide vane. The forward rotation of the guide vane can squeeze the gas entering the valve body and then increase the pressure for output. The reverse rotation of the guide vane can increase the resistance to the gas entering the valve body, thereby reducing the pressure of the gas for output. The pressure sensor on the branch pipe after the gas outlet joint monitors the natural gas pressure supplied to the fire gun. When the pressure sensor detects that the natural gas pressure supplied to the fire gun is not the set pressure value, the control motor is given an instruction on the rotation direction and speed to make the control motor rotate at a certain speed in the forward or reverse direction, so that the natural gas pressure supplied to one end of the fire gun tends to the set value.

[0008] Each branch pipe is provided with a control valve capable of adjusting the outlet pressure of the branch pipe, so that the pressure change of the main pipe or the pressure change of each branch pipe will not interfere with the output pressure of the branch pipe, or in other words, the interference of each branch pipe and the main pipe on the output pressure can be eliminated through real-time control of the control valve.

[0009] At one end of the lance, the natural gas flow rate and the intake volume of the combustion air are directly proportional. In order to mitigate the adverse effects of the sudden change in pressure at one end of the lance, the rotating shaft is set to the first half shaft and the second half shaft. The first half shaft is controlled by the control motor. When the speed of the control motor suddenly changes, the rotating shaft and the lower half of the guide vane on the rotating shaft will have a speed difference with the upper half due to the inertia force. This speed difference will interfere with the air pressure interference caused by the change in the rotating shaft speed, so that the pressure at the air outlet end of the valve body is slowly adjusted until the first half shaft and the second half shaft are synchronized; mitigating the change in air pressure can prevent the natural gas supply from changing suddenly, and thus prevent the sudden change in the amount of combustion air. While improving safety and reliability, it is also a way to save natural gas, because the rapid change in natural gas flow will inevitably lead to problems of incomplete combustion or excessive combustion air, which is inconsistent with the set ideal combustion state. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of this control system.

[0011] Figure 2 It is a structural diagram of the control valve.

[0012] Figure 3 It is a schematic diagram of the internal structure of the control valve.

[0013] Figure 4 It is a cross-sectional view of the control valve.

[0014] In the figure, 1, main pipe; 2, branch pipe; 3, control valve; 31, valve body; 32, control motor; 33, rotating shaft; 34, guide vane; 35, air inlet connector; 36, air outlet connector; 37, pressure sensor; 4, mounting bracket; 51, first half shaft; 52, second half shaft; 53, plug rod; 54, plug tube; 55, torsion spring. DETAILED DESCRIPTION

[0015] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0016] like Figures 1 to 4 As shown, it includes a main pipe 1 and a plurality of branch pipes 2 connected in parallel with the main pipe 1. A control valve 3 is arranged on the branch pipe 2. The control valve 3 includes a mounting frame 4, a tubular valve body 31, a control motor 32, a rotating shaft 33 and a rotary valve outside the rotating shaft 33. The rotary valve is a spiral guide plate 34 arranged on the outer wall of the rotating shaft 33. An air inlet connector 35 and an air outlet connector 36 are respectively arranged on the side walls of the valve body 31. The air inlet connector 35 is connected to the upper end of the inner cavity of the valve body 31, and the air outlet connector 36 is connected to the lower end of the valve body 31. The rotating shaft 33 is fixedly connected to the output shaft of the control motor 32. The rotary valve is rotatably connected in the valve body 31. The air inlet connector 35 is connected to the main pipe 1, and the air outlet connector 36 is connected to the air outlet end of the branch pipe 2. The housing of the control motor 32 and the valve body 31 are both fixed on the mounting frame 4; a pressure sensor 37 is arranged on the branch pipe 2 near one end of the air outlet connector 36.

[0017] The rotating shaft 33 includes a first half shaft 51 connected to one end of the output shaft of the control motor 32 and a second half shaft 52 connected to the first half shaft 51. The lower end of the first half shaft 51 has an insertion rod 53, and the upper end of the second half shaft 52 has an insertion tube 54. The insertion rod 53 is rotatably connected in the insertion tube 54, and a torsion spring 55 is connected between the insertion rod 53 and the insertion tube 54; the guide plate 34 includes an upper half connected to the first half shaft 51 and a lower half connected to the second half shaft 52.

[0018] The control motor 32 rotates to rotate the guide vane 34. The forward rotation of the guide vane 34 can squeeze the gas entering the valve body 31 and then increase the pressure for output. The reverse rotation of the guide vane 34 can increase the resistance of the gas entering the valve body 31, thereby reducing the pressure of the gas for output. The pressure sensor 37 on the branch pipe 2 after the gas outlet joint 36 monitors the natural gas pressure supplied to the fire gun. When the pressure sensor 37 detects that the natural gas pressure supplied to the fire gun is not the set pressure value, the control motor 32 is given an instruction on the rotation direction and speed to rotate at a certain speed in the forward or reverse direction, so that the natural gas pressure supplied to one end of the fire gun tends to the set value.

[0019] A control valve 3 capable of adjusting the outlet pressure of the branch pipe 2 is provided on each branch pipe 2, so that the pressure change of the main pipe 1 or the pressure change of each branch pipe 2 will not interfere with the output pressure of the branch pipe 2, or in other words, the interference of each branch pipe 2 and the main pipe 1 on the output pressure can be eliminated through real-time control of the control valve 3.

[0020] At one end of the lance, the natural gas flow rate and the intake amount of the combustion-supporting air are directly proportional. In order to mitigate the adverse effects of the sudden change in pressure at one end of the lance, the rotating shaft 33 is set as a first semi-shaft 51 and a second semi-shaft 52. The first semi-shaft 51 is controlled by the control motor 32. When the speed of the control motor 32 suddenly changes, the rotating shaft 33 and the lower half of the guide plate 34 located on the rotating shaft 33 will have a speed difference with the upper half due to the inertia force. This speed difference will interfere with the air pressure interference caused by the change in the speed of the rotating shaft 33, so that the pressure at the outlet end of the valve body 31 is slowly adjusted until the first semi-shaft 51 and the second semi-shaft 52 are synchronized; mitigating the change in air pressure can prevent the natural gas supply from changing suddenly, and thus prevent the sudden change in the amount of the combustion-supporting air. While improving safety and reliability, it is also a way to save natural gas, because the sudden change in the natural gas flow rate will inevitably lead to problems of insufficient combustion or excessive combustion-supporting air, which is inconsistent with the set ideal combustion state.

[0021] When the torsion spring is in its natural state, the upper section is connected with the lower section, and the airflow can be smoothly discharged. When there is a speed difference between the first and second semi-shafts, or when there is torque between the first and second semi-shafts, the smoothness of the airflow is disturbed, and this process does not end until the first and second semi-shafts are synchronized, so that there is a transition period for the change in the pressure value of the output pressure to avoid sudden changes in air pressure.

[0022] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A natural gas quantitative control system for a float glass production line, characterized in that: The invention comprises a main pipe (1) and a plurality of branch pipes (2) connected in parallel with the main pipe (1), wherein a control valve (3) is arranged on the branch pipe (2), wherein the control valve (3) comprises a mounting frame (4), a tubular valve body (31), a control motor (32), a rotating shaft (33) and a rotary valve outside the rotating shaft (33), wherein the rotary valve is a spiral guide plate (34) arranged on the outer wall of the rotating shaft (33), and an air inlet joint (35) and an air outlet joint (36) are respectively arranged on the side wall of the valve body (31), wherein the air inlet joint (35) is connected to the valve body (31) and the air outlet joint (36) is connected to the valve body (31). 1) is connected to the upper end of the inner cavity of the valve body (31), the outlet connector (36) is connected to the lower end of the inner cavity of the valve body (31), the rotating shaft (33) is fixedly connected to the output shaft of the control motor (32), the rotary valve is rotatably connected in the valve body (31), the air inlet connector (35) is connected to the main pipe (1), the air outlet connector (36) is connected to the air outlet end of the branch pipe (2), the housing of the control motor (32) and the valve body (31) are both fixed on the mounting frame (4); a pressure sensor (37) is provided on the branch pipe (2) near one end of the air outlet connector (36).

2. According to claim 1, a natural gas quantitative control system for a float glass production line is characterized in that: The rotating shaft (33) comprises a first half shaft (51) connected to one end of the output shaft of the control motor (32) and a second half shaft (52) connected to the first half shaft (51); the lower end of the first half shaft (51) has a plug rod (53); the upper end of the second half shaft (52) has a plug tube (54); the plug rod (53) is rotatably connected in the plug tube (54); a torsion spring (55) is connected between the plug rod (53) and the plug tube (54); the guide vane (34) comprises an upper half connected to the first half shaft (51) and a lower half connected to the second half shaft (52).

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