CN217441688U - Gas pressure regulating system of gas unit - Google Patents
Gas pressure regulating system of gas unit Download PDFInfo
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- CN217441688U CN217441688U CN202220986502.6U CN202220986502U CN217441688U CN 217441688 U CN217441688 U CN 217441688U CN 202220986502 U CN202220986502 U CN 202220986502U CN 217441688 U CN217441688 U CN 217441688U
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Abstract
The utility model provides a gas pressure adjusting system of a gas unit, belonging to the technical field of gas pressure adjustment of the gas unit; the technical problem to be solved is as follows: the improvement of the hardware structure of a gas pressure regulating system of a gas turbine set is provided; the gas filter comprises a unit gas inlet pipeline, a gas filter, a heat exchanger and a main gas pipeline branch, wherein the inlet of the main gas pipeline branch is connected with a gas source after being connected with the main gas pipeline, the outlet of the main gas pipeline branch is connected with the inlet of the heat exchanger, the outlet of the heat exchanger is connected with the inlet of the gas filter through a pipeline, a first pressure gauge is arranged on the pipeline between the heat exchanger and the gas filter, the outlet of the gas filter is connected with the unit gas inlet pipeline and then connected into the unit, a second pressure gauge, an electromagnetic valve, an electric regulating valve and a gas pressure relief valve are arranged on the unit gas inlet pipeline, and a pressure transmitter is arranged at the outlet of the gas filter; the utility model discloses be applied to gas unit.
Description
Technical Field
The utility model provides a gas pressure governing system of gas unit belongs to gas unit's gas pressure governing system technical field.
Background
At present, because the air-fuel ratio of the gas is not accurately controlled, the influence of the fluctuation of the air pressure on the unit is only passively received, so that the gas pressure is suddenly increased when the unit runs at high load, and the overload shutdown of the unit is caused. When the gas pressure is suddenly reduced, the shutdown fault of the unit is not caused, and the load reduction operation of the unit is only caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an overcome not enough that exists among the prior art, the technical problem that will solve is: the improvement of the hardware structure of the gas pressure regulating system of the gas turbine set is provided.
In order to solve the technical problem, the utility model discloses a technical scheme be: a gas pressure adjusting system of a gas unit comprises a unit gas inlet pipeline, a gas filter, a heat exchanger and a main gas pipeline branch, wherein an inlet of the main gas pipeline branch is connected with a gas source after being connected with a main gas pipeline, an outlet of the main gas pipeline branch is connected with an inlet of the heat exchanger, an outlet of the heat exchanger is connected with an inlet of the gas filter through a pipeline, a first pressure gauge is arranged on the pipeline between the heat exchanger and the gas filter, an outlet of the gas filter is connected into the unit after being connected with the unit gas inlet pipeline, a second pressure gauge, an electromagnetic valve, an electric regulating valve and a gas pressure relief valve are arranged on the unit gas inlet pipeline, and a pressure transmitter is arranged at an outlet of the gas filter;
the pressure transmitter, the first pressure gauge and the second pressure gauge are respectively connected with the control cabinet through leads, and the electromagnetic valve and the electric regulating valve are respectively connected with the control cabinet through leads.
The PLC is connected with the electromagnetic valve, the electric control valve, the pressure transmitter, the first pressure gauge, the second pressure gauge and the display screen through leads;
the PLC is also connected with a remote control host through wires or wirelessly.
The fuel gas pressure release valve is a mechanical pressure release valve, and the highest pressure is 105 KPa.
The PLC is internally provided with a PID control program, the PID control program comprises a measuring part, a comparing part and an executing part, wherein the measuring part acquires a pressure value on a gas pipeline as an input value through a pressure transmitter, the comparing part is realized through the PLC, and the executing part adjusts the opening of the valve through an electric adjusting valve.
The utility model discloses beneficial effect for prior art possesses does: the gas pressure adjusting system of the gas unit increases the adaptability of the domestic gas unit to the gas pressure; the abnormal shutdown of the unit is reduced, the safe and efficient operation of the unit is ensured, and the service life of each part is prolonged; the original passive personnel intervention is changed into active intelligent advance judgment, the intensity of the reduced workers is reduced, and the efficiency is improved.
Drawings
The present invention will be further explained with reference to the accompanying drawings:
fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic view of a control logic structure of the electric control valve of the present invention;
fig. 3 is a control logic diagram of the PID controller of the present invention;
in the figure: the gas pressure regulating device comprises a unit gas inlet pipeline 1, an electromagnetic valve 2, an electric regulating valve 3, a gas pressure relief valve 4, a pressure transmitter 5, a gas filter 6, a first pressure gauge 7, a heat exchanger 8, a main gas pipeline branch 9 and a second pressure gauge 10.
Detailed Description
As shown in fig. 1-3, the gas pressure regulating system of the gas turbine set of the utility model comprises a gas inlet pipeline 1 of the gas turbine set, a gas filter 6, a heat exchanger 8 and a branch 9 of a main gas pipeline, the inlet of the main gas pipeline branch 9 is connected with the main gas pipeline and then connected with a gas source, the outlet of the main gas pipeline branch 9 is connected with the inlet of a heat exchanger 8, the outlet of the heat exchanger 8 is connected with the inlet of a gas filter 6 through a pipeline, wherein a first pressure gauge 7 is arranged on a pipeline between the heat exchanger 8 and the gas filter 6, an outlet of the gas filter 6 is connected with a unit gas inlet pipeline 1 and then is connected into the unit, wherein a second pressure gauge 10, an electromagnetic valve 2, an electric regulating valve 3 and a gas pressure release valve 4 are arranged on a gas inlet pipeline 1 of the unit, and a pressure transmitter 5 is arranged at an outlet of a gas filter 6;
the pressure transmitter 5, the first pressure gauge 7 and the second pressure gauge 10 are respectively connected with the control cabinet through leads, and the electromagnetic valve 2 and the electric regulating valve 3 are respectively connected with the control cabinet through leads.
A PLC controller is arranged in the control cabinet, a display screen is arranged on the front face of the control cabinet, and the PLC controller is respectively connected with the electromagnetic valve 2, the electric regulating valve 3, the pressure transmitter 5, the first pressure gauge 7, the second pressure gauge 10 and the display screen through leads;
the PLC is also connected with a remote control host through wires or wirelessly.
The gas pressure release valve 4 specifically adopts a mechanical pressure release valve, and the highest pressure is 105 KPa.
The PLC controller is internally provided with a PID control program, the PID control program comprises a measuring part, a comparing part and an executing part, wherein the measuring part acquires a pressure value on a gas pipeline as an input value through a pressure transmitter 5, the comparing part is realized through the PLC controller, and the executing part adjusts the opening degree of a valve through an electric adjusting valve 3.
The utility model provides a through increasing the electrical control valve 3 and the automatic gas relief valve 4 of pressure transmitter 5 and mechanical type of PLC control on the unit gas inlet pipeline 1 of unit front end, adopt the linkage strategy of gas pressure unusual increase at the unit control end, let the unit force to carry 50% operation. As shown in fig. 1, the gas-fired power generating unit mainly comprises a gas inlet pipeline 1 of the unit and an electromagnetic valve 2, and is mainly used for rapidly cutting off gas when the unit fails; the newly added gas electric regulating valve 3 is mainly used for controlling the gas pressure when the unit operates; the gas pressure release valve 4 is mainly used for controlling when the gas pressure is increased suddenly; the pressure transmitter 5 in front of the regulating valve is mainly used for PID control of the unit; the gas filter 6 is mainly used for filtering gas of the unit; a first pressure gauge 7 in front of the gas filter, which is mainly used for triggering a linkage strategy of abnormal increase of gas pressure; the heat exchanger 8 is mainly used for dehydrating fuel gas; a main gas pipeline branch 9; and a second pressure gauge 10 for gas entering the unit is mainly used for controlling small pressure change.
Through the utility model discloses a gas pressure governing system carries out pressure adjustment's main process flow as follows.
Case 1, gas pressure increase fluctuation (within 5 kpa)
The gas pressure fluctuation control method comprises the steps of fully-loaded running of a unit- > gas pressure fluctuation (within 5 kpa) - > pressure fluctuation acquired by a front-end pressure transmitter 5- > PLC sends out PID (proportion integration differentiation) instruction control- > reduction of the opening degree of an electric regulating valve 3- > to adapt to gas pressure fluctuation within 1 kpa- > stable running of the unit.
The unit runs in full load- > the gas pressure increases and fluctuates (when being more than 5 kpa), and triggers simultaneously:
- >1 the mechanical automatic gas pressure release valve 4 is opened and automatically closed when the pressure is smaller than the set pressure;
the linkage strategy that the PLC triggers the abnormal increase of the gas pressure is controlled by the linkage strategy command- > reduces the opening of the electric regulating valve 3 by 50% and the unit is operated by forcibly reducing the load-so as to adapt to the condition that the gas pressure fluctuates within 1 kpa- > when the first pressure gauge 7 collects the pressure fluctuation smaller than 1kpa, the PLC relieves the abnormal increase of the gas pressure, and the unit can be stably operated by loading.
The specific embodiment of the utility model is as follows.
1. In order to ensure that the gas pressure is stabilized at 98Kpa (the local atmospheric pressure is 92Kpa) during the operation of the unit, the manual valve at the gas inlet is replaced by an electric regulating valve, a pressure transmitter is additionally arranged on a gas inlet pipeline of the unit, the pressure transmitter feeds the gas pressure at the inlet of the unit back to the PLC in real time, and the PLC automatically regulates the opening of the electric valve through PID control to achieve the purpose of pressure stabilization.
2. The instruction and feedback of the gas regulating valve are introduced into a power station control background, and an operator can manually operate and check the opening degree of the gas regulating valve at the background.
3. A mechanical pressure release valve (105 kpa) of a gas pipeline is added, so that the flexibility of opening and closing of pressure release and the rapidness of action are ensured, and the purposes of rapid opening and rapid cutting off can be achieved.
4. And the remote automatic control of the unit is realized.
Considering that the pressure of the gas on site changes frequently, the precision of the regulating valve must be high when the model is selected. Because the control system of the unit manufacturer does not consider a series of operations such as remote control of the regulating valve, when the remote start-stop operation is realized, part of equipment needs to be additionally installed and debugged.
The control logic of the electric control valve 3 of the utility model is as shown in figure 2: in the starting process of the unit, the electric valve has the following regulating logic.
1. And after the self-checking of the valve is finished, a starting command is sent out.
2. The electric regulator valve 3 starts to open slowly.
3. The pressure transmitter 5 feeds back the gas pressure value to the PLC controller.
4. The PLC calculates according to the gas pressure value and gives an opening or closing instruction to the electric regulating valve 3.
5. And the PLC adjusts the gas pressure to 98Kpa, and then fine adjustment is carried out to keep the pressure stable.
The utility model discloses a PLC controller realizes pressure control through PID control, and PID control introduces as follows: the industrial application field automatic control comprises three parts: measuring, comparing and executing. What is essential to the measurement is the actual value of the controlled variable, which is compared with the desired value, and this deviation is used to correct the response of the system and to perform the regulation control. In engineering practice, the most widely used control law of the regulator is proportional, integral and derivative control, which is called PID control for short, also called PID regulation.
A PID controller (proportional-integral-derivative controller) is a common feedback loop component in industrial control applications, consisting of a proportional unit P, an integral unit I and a derivative unit D. The basis of PID control is proportional control; integral control may eliminate steady state errors, but may increase overshoot; differential control can accelerate the response speed of the large inertia system and weaken the overshoot tendency.
The utility model discloses in, the measuring part is accomplished by gas pipeline's pressure transmitter 5, and the comparison part is accomplished by the PLC controller among the control system, and the execution part is accomplished by the electrical control valve 3 who installs additional, and the triplex forms an effectual closed-loop control system. The control logic diagram is shown in fig. 3.
About the utility model discloses what the concrete structure needs to explain, the utility model discloses a each part module connection relation each other is definite, can realize, except that the special explanation in the embodiment, corresponding technological effect can be brought to its specific connection relation to based on do not rely on under the prerequisite of corresponding software program execution, solve the utility model provides a technical problem, the utility model discloses except that the model, the connected mode of the part that appear, module, concrete components and parts, all belong to the prior art such as the published patent that can acquire in the field of technical staff at the application day ahead, published journal thesis, or common general knowledge, need not to describe repeatedly for the technical scheme that the present case provided is clear, complete, can realize, and can reappear or obtain corresponding entity product according to this technical means.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (4)
1. The utility model provides a gas unit's gas pressure governing system, includes unit gas inlet pipeline (1), gas filter (6), heat exchanger (8), gas main pipeline branch (9), its characterized in that: an inlet of the main gas pipeline branch (9) is connected with a main gas pipeline and then connected with a gas source, an outlet of the main gas pipeline branch (9) is connected with an inlet of a heat exchanger (8), an outlet of the heat exchanger (8) is connected with an inlet of a gas filter (6) through a pipeline, a first pressure gauge (7) is arranged on the pipeline between the heat exchanger (8) and the gas filter (6), an outlet of the gas filter (6) is connected with a unit gas inlet pipeline (1) and then connected into the unit, a second pressure gauge (10), an electromagnetic valve (2), an electric regulating valve (3) and a gas pressure relief valve (4) are arranged on the unit gas inlet pipeline (1), and a pressure transmitter (5) is arranged at the outlet of the gas filter (6);
and the pressure transmitter (5), the first pressure gauge (7) and the second pressure gauge (10) are respectively connected with the control cabinet through leads, and the electromagnetic valve (2) and the electric regulating valve (3) are respectively connected with the control cabinet through leads.
2. The gas pressure regulating system of a gas turbine unit according to claim 1, characterized in that: a PLC controller is arranged in the control cabinet, a display screen is arranged on the front face of the control cabinet, and the PLC controller is respectively connected with the electromagnetic valve (2), the electric regulating valve (3), the pressure transmitter (5), the first pressure gauge (7), the second pressure gauge (10) and the display screen through leads;
the PLC is also connected with a remote control host computer through wires or wirelessly.
3. The gas pressure regulating system of a gas turbine unit according to claim 1, characterized in that: the gas pressure release valve (4) is a mechanical pressure release valve, and the highest pressure is 105 KPa.
4. The gas pressure regulating system of a gas turbine unit according to claim 2, characterized in that: the PLC controller is internally provided with a PID control program, the PID control program comprises a measuring part, a comparing part and an executing part, wherein the measuring part acquires a pressure value on a gas pipeline as an input value through a pressure transmitter (5), the comparing part is realized through the PLC controller, and the executing part adjusts the opening degree of a valve through an electric adjusting valve (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220986502.6U CN217441688U (en) | 2022-04-26 | 2022-04-26 | Gas pressure regulating system of gas unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220986502.6U CN217441688U (en) | 2022-04-26 | 2022-04-26 | Gas pressure regulating system of gas unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217441688U true CN217441688U (en) | 2022-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220986502.6U Active CN217441688U (en) | 2022-04-26 | 2022-04-26 | Gas pressure regulating system of gas unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217441688U (en) |
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2022
- 2022-04-26 CN CN202220986502.6U patent/CN217441688U/en active Active
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