Gas holder adjusting control device

Abstract

The invention relates to a gas holder adjusting control device which comprises a blast furnace gas holder, an inlet pipeline is arranged on one side of the lower portion of the blast furnace gas holder, an outlet pipeline is arranged on the other side of the lower portion of the blast furnace gas holder, and the inlet pipeline and the outlet pipeline are connected to a blast furnace gas main pipeline. An HV101 regulating valve and a PV101 regulating valve are sequentially arranged on an inlet pipeline of the blast furnace gas chamber; an HV102 regulating valve and a PV102 regulating valve are sequentially arranged on an outlet pipeline of the blast furnace gas holder; a PV103 regulating valve is arranged on the blast furnace gas main pipeline; the PV101 regulating valve is in front pressure linkage with the PV103 regulating valve; the HV101 valve is linked with the upper limit of the cabinet position of the blast furnace gas cabinet; the PV102 regulating valve is in pressure linkage with the PV103 regulating valve; and the HV102 regulating valve is linked with the lower limit of the cabinet position of the blast furnace gas cabinet. According to the invention, the pressure stability of the pipe network can be effectively ensured, and the functions of automatic control, unattended operation, remote monitoring and the like are realized, so that the manual operation difficulty can be effectively reduced, the labor cost is reduced, and the automatic operation target is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic control of gas holders, and particularly to a gas holder adjustment control device. Background Art

[0002] In iron and steel enterprises, the blast furnace gas holder, as an important device for regulating the pressure of the gas pipeline network, has long operated the functions of swallowing and discharging gas under manual dispatching instructions. The duty personnel adjust the main pipeline gas pressure by operating the gas holder to receive and release gas through dispatching connections. Limited by the human technical level, they cannot accurately control the main pipeline pressure, resulting in large fluctuations in the main pipeline pressure, usually between 8 - 12 KPa.

[0003] With the wide application of CCPP power generation technology, the blast furnace gas pressure entering the CCPP unit needs to be stabilized at 9 ± 0.5 KPa. No effective solution has been developed for the problems generated during the process of regulating the main pipeline pressure by the blast furnace gas holder. Summary of the Invention

[0004] Aiming at the above problems, the purpose of the present invention is to provide a gas holder adjustment control device, which can ensure stable pipeline pressure, fully automatic control, unattended operation, and has a remote monitoring function.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A gas holder adjustment control device proposed by the present invention includes a blast furnace gas holder. It is characterized in that an inlet pipeline is arranged on one side of the lower part of the blast furnace gas holder, and an outlet pipeline is arranged on the other side, and its inlet pipeline and outlet pipeline are respectively connected to the blast furnace gas main pipeline; an HV101 regulating valve and a PV101 regulating valve are sequentially arranged on the inlet pipeline of the blast furnace gas holder; an HV102 regulating valve and a PV102 regulating valve are sequentially arranged on the outlet pipeline of the blast furnace gas holder; a PV103 regulating valve is arranged on the blast furnace gas main pipeline; the PV101 regulating valve is interlocked with the pressure before the PV103 regulating valve; the HV101 valve is interlocked with the upper limit of the gas holder level of the blast furnace gas holder; the PV102 regulating valve is interlocked with the pressure after the PV103 regulating valve; the HV102 regulating valve is interlocked with the lower limit of the gas holder level of the blast furnace gas holder.

[0007] Furthermore, the HV101 regulating valve, PV101 regulating valve, HV102 regulating valve, PV102 regulating valve, and PV103 regulating valve are all electric regulating butterfly valves.

[0008] The present invention has the following beneficial effects compared with the prior art:

[0009] 1. Stable pipeline network pressure: Through improvement, the pressure of the gas pipeline network is stabilized to meet the pressure requirements of users, preventing the occurrence of high-pressure situations and low-pressure flameout accidents, reducing the waste of gas resources during ignition and dispersion, and ensuring stable production operation.

[0010] 2. Achieve automatic control: Through improvement, the gas holder can achieve automatic control functions through newly added regulating valves, eliminating manual operation errors and completing the intelligent upgrade of the gas system.

[0011] 3. Reduce labor costs: Through transformation, the number of operation positions is reduced to achieve unattended functions, which can significantly reduce labor operation costs.

[0012] 4. Achieve remote monitoring: Through improvement, remote operation can be achieved, and the positions in the gas dangerous areas are transferred to the central dispatching room for remote monitoring, reducing the safety risks of personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the overall structural schematic diagram of the present invention;

[0014] Figure 2 is the schematic diagram of the control principle of the present invention;

[0015] Figure 3 is the structural schematic diagram of the original gas holder control device.

[0016] Among them, reference numerals: 1 - blast furnace gas holder; 2 - inlet pipeline; 3 - outlet pipeline; 4 - main blast furnace gas pipeline; 5 - HV101 regulating valve; 6 - PV101 regulating valve; 7 - HV102 regulating valve; 8 - PV102 regulating valve; 9 - PV103 regulating valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] See the appendix Figure 1-2, a gas holder regulating and controlling device proposed by the present invention includes a blast furnace gas holder 1. On one side of the lower part of the blast furnace gas holder 1, an inlet pipe 2 is provided, and on the other side, an outlet pipe 3 is provided. The other ends of the inlet pipe and the outlet pipe of the blast furnace gas holder 1 are respectively connected to the blast furnace gas main pipe 4; along the direction from the blast furnace gas holder 1 to the blast furnace gas main pipe 4 on the inlet pipe 2 of the blast furnace gas holder 1, an HV101 regulating valve 5 and a PV101 regulating valve 6 are sequentially arranged; along the direction from the blast furnace gas holder 1 to the gas main pipe 4 on the outlet pipe 3 of the blast furnace gas holder 1, an HV102 regulating valve 7 and a PV102 regulating valve 8 are sequentially arranged.

[0019] Through transformation, the gas inlet and outlet of the original blast furnace gas holder are separated by two pipes for gas reception and release.

[0020] An PV103 regulating valve 9 is arranged on the blast furnace gas main pipe 4; the PV103 regulating valve 9 can cut off the blast furnace gas main pipe 4 to form on-line operation of the gas holder.

[0021] The PV101 regulating valve 6 is interlocked with the pressure in front of the PV103 regulating valve 9. When the pressure is higher than the set value P1, the valve of the PV101 regulating valve 6 is adjusted to open to receive gas; the HV101 valve 5 is interlocked with the upper limit of the gas holder level of the blast furnace gas holder 1. When the gas holder level reaches the upper limit value, the HV101 regulating valve 5 closes to keep the gas holder in position; the PV102 regulating valve 8 is interlocked with the pressure behind the PV103 regulating valve 9. When the pressure is lower than the set value P3, the valve of the PV102 regulating valve 8 is adjusted to open to release gas; the HV102 regulating valve 7 is interlocked with the lower limit of the gas holder level of the blast furnace gas holder 1. When the gas holder level reaches the lower limit value, the HV102 regulating valve 7 closes to keep the gas holder in position.

[0022] In the present invention, the HV101 regulating valve 5, the PV101 regulating valve 6, the HV102 regulating valve 7, the PV102 regulating valve 8 and the PV103 regulating valve 9 are all electric regulating butterfly valves.

[0023] The control principle of the present invention lies in:

[0024] 1) Motor control: The electric regulating butterfly valve is controlled by a motor, generally a DC motor or an AC motor. According to the control signal, the motor rotates to drive the opening and closing of the valve disc, thereby changing the size of the fluid passage.

[0025] 2) Receiving control signal: The electric regulating butterfly valve receives an external control signal, and the electrical signal is usually an analog signal (such as 4-20 mA) or a digital signal (such as 0-5 V).

[0026] 3) Position feedback: Electrically operated regulating butterfly valves are usually equipped with position feedback devices to provide information on the position of the valve disc. Commonly used position feedback devices include rotary position sensors or Hall sensors. The position feedback device feeds the valve disc position information back to the control system to achieve precise valve control.

[0027] 4) Control system: Based on the received control signal and position feedback signal, the control system of the electrically operated regulating butterfly valve calculates the drive control signal for the motor through a control algorithm, controlling the rotation direction and speed of the motor, thereby achieving the opening and closing control of the valve disc. In summary, the control principle of the electrically operated regulating butterfly valve is that the control system receives external control signals and position feedback signals, calculates the drive control signal for the motor, and thus controls the opening and closing degree of the valve disc to achieve the flow regulation of the fluid.

[0028] As Figure 3 shown, the original control method of the blast furnace gas holder is as follows: Taking the 300,000 m³ blast furnace gas holder as an example, there is a main inlet and outlet pipe at the bottom of the original gas holder, which is connected to the main pipe network. Two regulating butterfly valves, HV101 and HV102, are installed to control the opening and closing of the regulating valves for the upper limit level of 290,000 m³ and the lower limit level of 10,000 m³ of the gas holder to ensure the safe operation of the gas holder. The pressure regulation of the gas holder is controlled by the piston counterweight, which fluctuates greatly with the fluctuation of the main pipe pressure. During production, in order to ensure the safety of the gas holder, the two regulating butterfly valves, HV101 and HV102, are manually operated. When the network pressure rises, the HV101 regulating butterfly valve is manually fully opened, and the HV102 regulating butterfly valve is set to open 30% to allow the gas holder to receive gas. After reaching the approaching value of the upper limit, the two regulating butterfly valves are manually closed to keep the gas holder in position. When the main pipe pressure drops, the HV101 regulating butterfly valve is manually fully opened, and the HV102 regulating butterfly valve is set to open 30% to release and supplement the main pipe network pressure to the main pipe network. This operation needs to be carried out under the command of the dispatching system. The gas holder does not achieve automatic operation and the main regulation function, but only functions as a storage function. The pressure of the main gas pipe network is still manually regulated by the dispatcher, with a large fluctuation range.

[0029] Applying the present invention to separate the inlet and outlet pipes of the gas holder helps to realize the online regulation function of the gas holder, ensure the automatic reception and release of gas by the gas holder, and at the same time reduce the safety risk of on-site manual operation. Compared with the original gas holder control method, it solves the difficulty of manual operation, eliminates the production operation error at night, and this control system significantly improves the stability of the pressure balance of the pipe network.

[0030] Matters not detailed in the present invention are all well-known technologies.

[0031] The embodiments described above are only descriptions of the preferred embodiments of the present invention and do not limit the scope of the present invention. Without departing from the spirit of the present invention's design, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A gas holder regulating and controlling device, including a blast furnace gas holder, characterized in that, One side of the lower part of the blast furnace gas holder is provided with an inlet pipeline, and the other side is provided with an outlet pipeline. The inlet pipeline and the outlet pipeline are respectively connected to the main blast furnace gas pipeline. An HV101 regulating valve and a PV101 regulating valve are sequentially arranged on the inlet pipeline of the blast furnace gas holder. An HV102 regulating valve and a PV102 regulating valve are sequentially arranged on the outlet pipeline of the blast furnace gas holder. A PV103 regulating valve is arranged on the main blast furnace gas pipeline. The PV101 regulating valve is interlocked with the pressure before the PV103 regulating valve. The HV101 valve is interlocked with the upper limit of the gas holder level of the blast furnace gas holder. The PV102 regulating valve is interlocked with the pressure after the PV103 regulating valve. The HV102 regulating valve is interlocked with the lower limit of the gas holder level of the blast furnace gas holder.

2. The gas holder regulating and controlling device according to claim 1, wherein: The HV101 regulating valve, the PV101 regulating valve, the HV102 regulating valve, the PV102 regulating valve and the PV103 regulating valve are all electric regulating butterfly valves.

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