CN113566009A - DCS-based heat supply steam extraction hydraulic control valve control method - Google Patents
DCS-based heat supply steam extraction hydraulic control valve control method Download PDFInfo
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- CN113566009A CN113566009A CN202110637882.2A CN202110637882A CN113566009A CN 113566009 A CN113566009 A CN 113566009A CN 202110637882 A CN202110637882 A CN 202110637882A CN 113566009 A CN113566009 A CN 113566009A
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- 238000000605 extraction Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000001514 detection method Methods 0.000 claims description 7
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 230000035772 mutation Effects 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Turbines (AREA)
Abstract
The invention relates to a heat supply steam extraction hydraulic control valve control method based on DCS, which is characterized by comprising the following steps: and (4) connecting the position feedback and proportional valve of the hydraulic control valve with the DCS control system, and controlling the hydraulic control valve through the DCS control system. The hydraulic control valve is more reliable to control; the control precision of the hydraulic control valve is higher; the whole system is more convenient to maintain; the heat supply quality is higher.
Description
Technical Field
The invention relates to the technical field of heat supply, in particular to a heat supply steam extraction hydraulic control valve control method based on a DCS (distributed control system).
Background
In order to improve the quality of urban environment and reduce urban haze, each city is transformed by centralized heat supply, and the heat supply of scattered small boilers is cancelled. Each power plant responds positively, heat supply transformation is carried out on the generator set, and the steam turbine is adopted to extract steam to heat circulating water for city heating. The steam extraction of the steam turbine adopts a hydraulic control valve to control the steam extraction pressure and temperature, and the heat supply quality is ensured. The hydraulic control valves are controlled by local PLC (programmable logic controller) which is shown in figure 1. Firstly, each hydraulic control valve adopts a set of PLC equipment to increase the equipment cost and the subsequent maintenance cost; secondly, the additional PLC increases intermediate links, so that more problems occur and the reliability of heat supply is influenced; thirdly, when the internal parameters of the PLC equipment are adjusted, the PLC equipment can be connected with special equipment, so that the operation is inconvenient, and the quick maintenance of the equipment is influenced; fourthly, the PLC equipment is adopted to control the hydraulic control valve, so that the control precision is low, and the energy conservation and the control are not facilitated; and fifthly, the intermediate PLC equipment is adopted for control, so that the operation and monitoring personnel are not facilitated to master the state of the valve in time, and the heat supply and the safety of the steam turbine unit are influenced.
Disclosure of Invention
The invention aims to provide a heat supply steam extraction hydraulic control valve control method based on a DCS, which adopts the DCS system to carry out integrated control, has the advantages of good operation environment, convenient maintenance, short maintenance time, less damage of spare parts, reduced maintenance amount, cost saving, high control reliability and the like.
The invention provides a heat supply steam extraction hydraulic control valve control method based on a DCS, which comprises the following steps:
the position feedback and proportional valve of the hydraulic control valve are connected with a DCS control system, and the control method comprises the following steps:
the automatic control mode or the manual control mode is selected through the hydraulic control valve positioning PID module, the hydraulic control valve positioning PID module receives the pressure control PID output during automatic control, and the hydraulic control valve positioning PID module receives the output of the manual module during manual control;
during automatic control, a set value of steam extraction steam pressure is compared with steam detection pressure of a steam extraction pipeline, when actual detection pressure is lower than the set value, a valve instruction output by the pressure control PID is increased, and when the actual detection pressure is higher than the set value, the valve instruction output by the pressure control PID is decreased;
after receiving a valve instruction output by the pressure control PID module, the hydraulic control valve positioning PID module compares the valve instruction with a valve position actually detected by the hydraulic control valve, when the valve instruction is smaller than the actually detected position, the hydraulic control valve positioning PID module outputs a 0-50% instruction, a 12-4 mA current signal of a clamping piece is output to a proportional valve of the hydraulic control valve corresponding to the DCS analog quantity, the proportional valve acts to close the hydraulic control valve to a position required by the instruction, when the valve instruction is larger than the actually detected position, the hydraulic control valve positioning PID module outputs a 0-50% instruction, a 12-20 mA current signal of the clamping piece is output to the proportional valve of the hydraulic control valve corresponding to the DCS analog quantity, and the proportional valve acts to open the hydraulic control valve to a position required by the instruction;
during automatic control, the manual module receives a valve instruction output by the pressure control PID module as an output valve instruction of the manual module, and an operator keyboard input value of the manual module is invalid, so that the phenomenon that the valve instruction is suddenly changed to generate disturbance when the hydraulic control valve positioning PID module is switched to manual control is prevented;
during manual control, an operator of the manual module inputs a valve set value through a keyboard, the hydraulic control valve positioning PID module receives an output value of the manual module and compares the output value with a valve position actually detected by the hydraulic control valve, when a valve instruction is smaller than the actually detected position, the hydraulic control valve positioning PID module outputs a 0-50% instruction, a 12-4 mA current signal of the clamping piece corresponding to the DCS analog quantity is output to a proportional valve of the hydraulic control valve, the proportional valve acts to close the hydraulic control valve to a position required by the instruction, when the valve instruction is larger than the actually detected position, the hydraulic control valve positioning PID module outputs a 0-50% instruction, a 12-20 mA current signal of the clamping piece corresponding to the DCS analog quantity is output to the proportional valve of the hydraulic control valve, and the proportional valve acts to open the hydraulic control valve to the position required by the instruction;
during manual control, the pressure control PID module receives a set value of an operator keyboard input valve of the manual module, and the output of the pressure control PID module is equal to the set value of the operator keyboard input valve of the manual module, so that the situation that when the liquid control valve positioning PID module is switched to automatic control, the valve instruction mutation generates disturbance is prevented.
Further, the zero position of the hydraulic control valve proportional valve is 12 milliamperes of input, so that the zero position of the DCS control system output is 12 milliamperes.
By means of the scheme, the control of the hydraulic control valve is more reliable through the heat supply steam extraction hydraulic control valve control method based on the DCS; the control precision of the hydraulic control valve is higher; the whole system is more convenient to maintain; the heat supply quality is higher.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a PLC control schematic diagram of a prior art pilot operated valve in situ;
FIG. 2 is a DCS control schematic diagram of the hydraulic control valve of the invention;
FIG. 3 is a logic diagram of the DCS control system of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 2 and 3, the present embodiment provides a method for controlling a heat supply steam extraction hydraulic control valve based on DCS, including:
the position feedback and proportional valve of the hydraulic control valve are connected with a DCS control system, and the control method comprises the following steps:
the hydraulic control valve positioning PID module can select automatic control or manual control, the hydraulic control valve positioning PID module receives pressure control PID output during automatic control, and the hydraulic control valve positioning PID module receives output of the manual module during manual control.
And when the actual detection pressure is higher than the set value, the valve instruction output by the pressure control PID is reduced.
After receiving the valve instruction output by the pressure control PID module, the hydraulic control valve positioning PID module compares the valve instruction with the valve position actually detected by the hydraulic control valve, when the valve instruction is smaller than the actually detected position, the hydraulic control valve positioning PID module outputs 0-50% of instruction, the 12-4 mA current signal of the clamping piece corresponding to the DCS analog quantity is output to the proportional valve of the hydraulic control valve, the action of the proportional valve is to close the hydraulic control valve to the position required by the instruction, when the valve instruction is larger than the actually detected position, the hydraulic control valve positioning PID module outputs 0-50% of instruction, the 12-20 mA current signal of the clamping piece corresponding to the DCS analog quantity is output to the proportional valve of the hydraulic control valve, and the action of the proportional valve is to open the hydraulic control valve to the position required by the instruction.
During automatic control, the manual module receives a valve instruction output by the pressure control PID module as an output valve instruction of the manual module, and the keyboard input value of an operator of the manual module is invalid.
During manual control, an operator of the manual module inputs a valve set value through a keyboard, the hydraulic control valve positioning PID module receives an output value of the manual module and compares the output value with a valve position actually detected by the hydraulic control valve, when a valve instruction is smaller than the actually detected position, the hydraulic control valve positioning PID module outputs a 0-50% instruction, a 12-4 mA current signal of the clamping piece corresponding to the DCS analog quantity is output to a proportional valve of the hydraulic control valve, the action of the proportional valve is to close the hydraulic control valve to a position required by the instruction, when the valve instruction is larger than the actually detected position, the hydraulic control valve positioning PID module outputs a 0-50% instruction, a 12-20 mA current signal of the clamping piece corresponding to the DCS analog quantity is output to the proportional valve of the hydraulic control valve, and the action of the proportional valve is to open the hydraulic control valve to the position required by the instruction.
During manual control, the pressure control PID module receives a set value of an operator keyboard input valve of the manual module, and the output of the pressure control PID module is equal to the set value of the operator keyboard input valve of the manual module.
In this embodiment, the zero position of the pilot-controlled valve proportional valve is 12 milliamperes of input, so the zero point of the DCS control system output is 12 milliamperes (the normal control output zero point is 4 milliamperes), and control of coordinating the DCS output and the proportional valve of the pilot-controlled valve is realized.
By the control method of the heat supply steam extraction hydraulic control valve based on the DCS, the control of the hydraulic control valve is more reliable; the control precision of the hydraulic control valve is higher; the whole system is more convenient to maintain; the heat supply quality is higher.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A heat supply steam extraction hydraulic control valve control method based on DCS is characterized by comprising the following steps:
the position feedback and proportional valve of the hydraulic control valve are connected with a DCS control system, and the control method comprises the following steps:
the automatic control mode or the manual control mode is selected through the hydraulic control valve positioning PID module, the hydraulic control valve positioning PID module receives the pressure control PID output during automatic control, and the hydraulic control valve positioning PID module receives the output of the manual module during manual control;
during automatic control, comparing a set value of steam extraction steam pressure with steam detection pressure of a steam extraction pipeline, increasing a valve instruction output by a pressure control PID when the actual detection pressure is lower than the set value, and decreasing the valve instruction output by the pressure control PID when the actual detection pressure is higher than the set value;
after receiving a valve instruction output by the pressure control PID module, the hydraulic control valve positioning PID module compares the valve instruction with a valve position actually detected by the hydraulic control valve, when the valve instruction is smaller than the actually detected position, the hydraulic control valve positioning PID module outputs a 0-50% instruction, a 12-4 mA current signal of a clamping piece is output to a proportional valve of the hydraulic control valve corresponding to the DCS analog quantity, the proportional valve acts to close the hydraulic control valve to a position required by the instruction, when the valve instruction is larger than the actually detected position, the hydraulic control valve positioning PID module outputs a 0-50% instruction, a 12-20 mA current signal of the clamping piece is output to the proportional valve of the hydraulic control valve corresponding to the DCS analog quantity, and the proportional valve acts to open the hydraulic control valve to a position required by the instruction;
during automatic control, the manual module receives a valve instruction output by the pressure control PID module as an output valve instruction of the manual module, and an operator keyboard input value of the manual module is invalid, so that the phenomenon that the valve instruction is suddenly changed to generate disturbance when the hydraulic control valve positioning PID module is switched to manual control is prevented;
during manual control, an operator of the manual module inputs a valve set value through a keyboard, the hydraulic control valve positioning PID module receives an output value of the manual module and compares the output value with a valve position actually detected by the hydraulic control valve, when a valve instruction is smaller than the actually detected position, the hydraulic control valve positioning PID module outputs a 0-50% instruction, a 12-4 mA current signal of the clamping piece corresponding to the DCS analog quantity is output to a proportional valve of the hydraulic control valve, the proportional valve acts to close the hydraulic control valve to a position required by the instruction, when the valve instruction is larger than the actually detected position, the hydraulic control valve positioning PID module outputs a 0-50% instruction, a 12-20 mA current signal of the clamping piece corresponding to the DCS analog quantity is output to the proportional valve of the hydraulic control valve, and the proportional valve acts to open the hydraulic control valve to the position required by the instruction;
during manual control, the pressure control PID module receives a set value of an operator keyboard input valve of the manual module, and the output of the pressure control PID module is equal to the set value of the operator keyboard input valve of the manual module, so that the situation that when the liquid control valve positioning PID module is switched to automatic control, the valve instruction mutation generates disturbance is prevented.
2. A method as claimed in claim 1, wherein the zero position of the pilot operated valve proportional valve is 12 ma input, so the zero position of the DCS control system output is 12 ma.
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| CN202110637882.2A CN113566009A (en) | 2021-06-08 | 2021-06-08 | DCS-based heat supply steam extraction hydraulic control valve control method |
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| CN202110637882.2A CN113566009A (en) | 2021-06-08 | 2021-06-08 | DCS-based heat supply steam extraction hydraulic control valve control method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4347869A (en) * | 1979-12-14 | 1982-09-07 | American Standard Inc. | Hydraulic valve position control system for regulating smokestack exhaust pressure |
| CN106014514A (en) * | 2016-06-24 | 2016-10-12 | 南京化学工业园热电有限公司 | Heat and power joint debugging control system and method |
| CN106500173A (en) * | 2016-10-26 | 2017-03-15 | 河南华润电力首阳山有限公司 | The control method of thermal power plant's extraction for heat supply and control system |
| CN111219520A (en) * | 2020-03-13 | 2020-06-02 | 大亚木业（肇庆）有限公司 | PLC-based electric valve control system and use method thereof |
| CN112524320A (en) * | 2020-11-30 | 2021-03-19 | 华能国际电力股份有限公司营口电厂 | Hydraulic butterfly valve control system |
-
2021
- 2021-06-08 CN CN202110637882.2A patent/CN113566009A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4347869A (en) * | 1979-12-14 | 1982-09-07 | American Standard Inc. | Hydraulic valve position control system for regulating smokestack exhaust pressure |
| CN106014514A (en) * | 2016-06-24 | 2016-10-12 | 南京化学工业园热电有限公司 | Heat and power joint debugging control system and method |
| CN106500173A (en) * | 2016-10-26 | 2017-03-15 | 河南华润电力首阳山有限公司 | The control method of thermal power plant's extraction for heat supply and control system |
| CN111219520A (en) * | 2020-03-13 | 2020-06-02 | 大亚木业（肇庆）有限公司 | PLC-based electric valve control system and use method thereof |
| CN112524320A (en) * | 2020-11-30 | 2021-03-19 | 华能国际电力股份有限公司营口电厂 | Hydraulic butterfly valve control system |
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Application publication date: 20211029 |
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