CN206094288U - Control circuit is adjusted in heat exchange station automatic control system's moisturizing - Google Patents
Control circuit is adjusted in heat exchange station automatic control system's moisturizing Download PDFInfo
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- CN206094288U CN206094288U CN201620882039.5U CN201620882039U CN206094288U CN 206094288 U CN206094288 U CN 206094288U CN 201620882039 U CN201620882039 U CN 201620882039U CN 206094288 U CN206094288 U CN 206094288U
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Abstract
The utility model belongs to the technical field of heat exchange station control system, the utility model discloses a control circuit is adjusted in heat exchange station automatic control system's moisturizing and method, the control circuit that this method adopted is by secondary side return water pressure sensor, the tank level sensor, the analysis processes module, governing valve PID module, the control modul, the moisturizing pump, water supplying valve, a frequency converter, a motor, a crankshaft position sensor, a switching power supply and a digital frequency meter, the touch -sensitive screen is constituteed, the touch -sensitive screen passes through the analysis processes module, governing valve PID module, the control modul, the converter links to each other with the moisturizing pump, moisturizing pump passing signal line links to each other with control module, the return water pressure collecting end of analysis processes module links to each other with secondary side return water pressure sensor, and the liquid level end links to each other with the tank level sensor, the control end passes through control module and links to each other with water supplying valve, the utility model discloses can make operation initial stage secondary pipe network be full of water to it with the normal water supply pressure of maintaining the secondary pipe network, is necessary assurance of heating system operation endless to reach the normal water of run duration heating system and let out leakage quantity's replenishment, the moisturizing under the accident condition.
Description
Technical field
The utility model belongs to heat exchange station control system technical field, relates generally to a kind of heat exchange station automatic control system
Moisturizing adjusts control loop.
Background technology
Central heating is the energy-conservation and environmental practice that country widelys popularize, with the continuous expansion of concentrated supply of heating in the city scale
Greatly, the management heat distribution pipe network of science has very great economic and social benefit.Heat exchange station and hot water pipe net are connection thermals source
With the important step of heat user, there is very important effect in whole heating system.
Current China's heating system is relatively backward, is embodied in that heating quality is poor, i.e., room temperature is uneven in temperature, system effect
Rate is low, and user is unable to sets itself and adjusts room temperature etc.；Lack control device, only simple regulating measure does not have
Thermostat, heat supply is not enough and it is excessive when, without effective regulating measure；Lack measurement means, cause to use without meterage
Family not actively energy-conservation, also results in administrative staff and lacks data and carry out operational management.
The content of the invention
To solve above-mentioned technical problem, the purpose of this utility model is to propose a kind of moisturizing of heat exchange station automatic control system
Adjust control loop.
The utility model is adopted the following technical scheme that to complete its invention task：
A kind of moisturizing of heat exchange station automatic control system adjusts control loop, is returned by the secondary side being fixed on heat-exchange unit
Water pressure sensor, high water tank sensor, analysis and processing module, regulating valve PID module, control module, small pump, moisturizing
Valve, frequency converter, touch-screen composition, the touch-screen passes through analysis and processing module, regulating valve PID module, control module and frequency conversion
Device is connected, and the output end of frequency converter is connected respectively with 1# small pumps, 2# small pumps, 1# small pumps, the signal end point of 2# small pumps
Not Tong Guo holding wire be connected with control module；The pressure of return water collection terminal of analysis and processing module is by holding wire and secondary side backwater
Pressure sensor is connected, and the liquid level end of analysis and processing module is connected by holding wire with high water tank sensor；Analyzing and processing mould
The control end of block is connected by control module with water compensating valve；Secondary side backwater is provided with the human-computer interaction interface of the touch-screen
Pressure setting membrane keyboard, water tank lacks water protection setting membrane keyboard, small pump PID proportional gain settings membrane keyboards, small pump PID are micro-
Membrane keyboard is set between timesharing.
Because using technical scheme as above, the utility model has following superiority：
A kind of moisturizing of heat exchange station automatic control system adjusts control loop, and initial operating stage secondary pipe network can be made to be full of water
And the moisturizing under supplement, the accident conditions of the normal water leakage rate of run duration heating system, to maintain secondary pipe network just
Often pressure of supply water, is the necessary guarantee of heating system operation circulation.
The heat exchange station automatic control system being made up of moisturizing regulation control loop ensure that the thermodynamic equilibrium of heat supply network, heat supply
System can safely and reliably be run, and realize the remote monitoring in the case of unmanned.Its superiority is as follows：1st, in range of flow
It is interior, combined with the regulation of water pump using continuously adjusting for frequency converter, it is ensured that constant pressure water supply；2. system takes frequency control way
Constant pressure, constant temperature water supply are realized, energy-saving effect is obvious；3. PID regulative modes are adopted, and water pressure fluctuations are little, and response is fast；4. realize
Replenishing water tank of water failure, tap water cut-off, system blackout, circulating pump be abnormal, the error protection that once net is cut off the water etc..
Description of the drawings
Fig. 1 is heat exchange station system schematic diagram；
Fig. 2 is heat exchange station automatic control system schematic diagram；
Fig. 3 is the control system schematic diagram of primary side electric control valve；
Fig. 4 is the control system schematic diagram of the circulatory system；
Fig. 5 is that moisturizing adjusts control loop system diagram.
Specific embodiment
The utility model is illustrated with reference to the drawings and specific embodiments：
As shown in Fig. 1,2,3,4,5, a kind of moisturizing of heat exchange station automatic control system adjusts control loop, is changed by being fixed on
Secondary side pressure of return water sensor, high water tank sensor, analysis and processing module, regulating valve PID module, control in heat engine group
Module, small pump, water compensating valve, frequency converter, touch-screen composition, the touch-screen passes through analysis and processing module, regulating valve PID mould
Block, control module are connected with frequency converter, and the output end of frequency converter is connected respectively with 1# small pumps, 2# small pumps, 1# small pumps, 2#
The signal end of small pump is connected respectively by holding wire with control module；The pressure of return water collection terminal of analysis and processing module is by letter
Number line is connected with secondary side pressure of return water sensor, and the liquid level end of analysis and processing module is by holding wire and high water tank sensor
It is connected；The control end of analysis and processing module is connected by control module with water compensating valve；On the human-computer interaction interface of the touch-screen
It is provided with secondary side pressure of return water setting membrane keyboard, water tank lacks water protection setting membrane keyboard, small pump PID proportional gain settings to touch
Touch key, small pump PID derivative times and set membrane keyboard.
A kind of heat exchange station automatic control system that control loop is constituted is adjusted by moisturizing, including：The temperature of exchange heat stations is adjusted
The circulatory system automaton of section control device, exchange heat stations, the moisturizing regulation control loop for exchanging heat stations is automatically controlled
Device；The temperature adjustment control device of exchange heat stations, circulatory system automaton, moisturizing adjust control loop and automatically control
Device is made up of information acquisition module, analysis and processing module, control module, touch display screen, the temperature letter of information acquisition module
Number collection terminal is connected by holding wire and the primary side and secondary side being fixed on heat-exchange unit for each temperature sensor of backwater,
Be connected with the temperature sensor of outdoor environment by holding wire, the pressure signal collection terminal of information acquisition module by holding wire with
Each pressure sensor of the primary side being fixed on heat-exchange unit with secondary side for backwater is connected, the output end of information acquisition module
It is connected with touch display screen by analysis and processing module, the control end of analysis and processing module is by control line and control module phase
Even, the valve actuating station of control module is respectively by primary side electric control valve control end, the pressure release on cable and heat-exchange unit
Valve control end, water compensating valve control end are connected, and the pump actuating station of control module is mended respectively by cable with No. 1 on heat-exchange unit
Water pump, No. 2 small pumps, No. 1 water circulating pump, No. 2 water circulating pumps are connected；The frequency conversion actuating station of control module passes through respectively cable
It is connected with small pump frequency converter, water circulating pump frequency converter；Small pump inverter output terminal is respectively by cable and No. 1 moisturizing
Pump, No. 2 small pumps are connected；Water circulating pump inverter output terminal is respectively by cable and No. 1 water circulating pump, No. 2 water circulating pumps
It is connected；Analysis and processing module transmission end is connected by holding wire with remote monitoring interface.
Heat exchange station refers to and is connected to once between net and secondary network, and equipped with relevant device, instrument, the control being connected with user
The machine room of control equipment.It is used to adjusting and keeping heating medium parameter（Pressure, temperature and flow）, make heat supply, reach safe Jing with heat
Ji operation, is the regulation hinge of heat exchange, heat distribution.
Heat exchange station is typically made up of heat-exchange system, the circulatory system, water charging system.Heat-exchange system mainly includes board-like heat exchange
Device and primary side electric control valve, carry out primary side and secondary side heat exchange and control heat exchange amount, to maintain secondary side to supply
Coolant-temperature gage；The circulatory system mainly includes 2 water circulating pumps and relief valve, it is ensured that to the pressure of supply water that user is constant；Water charging system
Mainly include 2 small pumps, water tank, moisturizing magnetic valves, to secondary side moisturizing, make to be full of water in pipeline and pressure of return water is stablized
One steady state value.
In control process, need to gather substantial amounts of physical quantity, such as pressure, temperature, flow, liquid level analog quantity parameter,
And Real-time Collection and process are carried out to these parameters by control module.Automatically controlling for heat exchange station, is to realize whole cell
The monitor in real time and Automatic Control of heat exchange heating system.
Heat exchange station automatic control system data acquisition, automatically control, parameter storage, real-time communication, fault alarm etc.
Function.Mainly have sensor and actuator group, information acquisition module, data processing module, control module, frequency converter, touch it is aobvious
Several functional block compositions such as display screen.
Component relationship between each functional module will be as shown in Fig. 2 information acquisition module will be exchanged heat by various senser elements
The parameters collection of unit is converted into the incoming analysis and processing module of the discernible data signal of system；Analysis and processing module passes through
Carry out Effective judgement, filtering process, magnitude transform, PID calculating etc. to gathered data to process after conversion, by status signal（Pressure
Power, temperature etc.）Carry out data storage and send into touch display screen parameter to show；Control module is combined by the data to storing and changed
Heat engine group difference operating condition is analyzed judgement, sends instruction and arrives the equipment such as corresponding water pump, regulating valve, frequency converter respectively,
Anomaly parameter to occurring carries out alarm decision and alarm state information is passed to into touch display screen parameter showing；Touch and show
Screen can be patterned man-machine interaction, and operator on duty can carry out supply water temperature setting by touch, the pid parameter of regulating valve sets
The pid parameter setting of fixed, water pump and pressure of return water, for the setting of backwater pressure reduction, o-volt protection value etc., it is total with technological process
Figure, regulating loop, setting value show, alarm logging, and last trend and memory scan function with historical data；Long-range prison
Control interface, there is provided the multiple interfaces such as RS485 data communication interfaces, analog output interface circuit, integrated alarm digital-quantity output interface
Facilitate remote monitoring.
Regulation control of the heat exchange station system to temperature seeks to ensure that secondary side has a constant supply water temperature, in heat exchange
The major function of the electric control valve that device primary side is installed is by adjusting valve opening, adjusting a pipe network hot water flow, control
The secondary heating load of heat exchanger, it is ensured that heating quality.The control principle of primary side electric control valve is as shown in figure 3, controller
It is compared with the secondary network supply water temperature of reality according to the temperature that touch display screen is arranged, and carries out PID arithmetic, computing is tied
Fruit output is to regulating valve（The aperture of 4-20mA signals correspondence adjustment type motor-driven valve 0 ~ 100%）, by adjusting primary side motorized adjustment
The aperture of valve is realizing stablizing for temperature.
(1) control manually
Manual control mode manually selects control model for Field Force（Manually）, on the touchscreen input control valve open
Degree setting value, so as to change the output valve of control module 4-20mA, when the aperture setting value in motor-driven valve increases, controls mould
Block continues the value for lentamente increasing mA, until after the corresponding mA values of output setting value, adjustment type motor-driven valve opens big opening to setting
Degree；When the aperture setting value in adjustment type motor-driven valve reduces, control module is persistently reduced slowly the value of mA, until output
After the corresponding mA values of setting value, adjustment type motor-driven valve is closed to the aperture of setting.（When system dead electricity, electric control valve is closed）
(2) automatically control
Automatic control mode manually selects control model for Field Force（Automatically）, it is automatic with PID tracing control functions
Primary side high-temperature water pipe network outlet electric control valve is controlled, the automatic control of heat exchanger secondary side hot water outlet temperature is realized
System, meets the requirement of user's room temperature.
2. the circulatory system is automatically controlled
The circulatory system is mainly made up of water circulating pump, frequency converter, relief valve etc., and its Main Function is responsible for secondary network system
The confession backwater pressurization of system, to meet hot water pipeline terminal user is supplied to.Automatically controlling for the circulatory system is by pressure signal control
Frequency converter output processed, so as to the control for controlling the rotating speed of circulating pump to realize to secondary network pressure of supply water, to maintain pressure differential resetting
Value.When a circulating pump cannot reach required pressure by frequency conversion pressurization, controller can make another stand-by pump input
It is final to realize more intelligentized Isobarically Control using being pressurizeed.Relief valve can be controlled manually and automatically, work as secondary side
Pressure of return water exceed setting value（Open window in touch display screen, the tangible modification of operating personnel）When, automatically open up pressure release
Valve；Also dependent on needing manual unlocking relief valve, it is to avoid secondary pressure is excessive, reaches the effective protection to pipeline.Each function
Component relationship between module is as shown in Figure 4.
(1) the VFC of circulating pump
The VFC of circulating pump adjusts control using PID, is automatically electronic to circulating pump with PID tracing control functions
The frequency of machine is controlled, and realizes constant control of the heat exchanger secondary side hot water pipe net for backwater pressure reduction, and meeting user's room temperature will
Seek and reached the effect of energy-conservation, consumption reduction, environmental protection.
When the secondary pressure reduction of actually detected value increases with preset value difference, frequency converter output frequency rises, and circulates pump work
In high-frequency state, secondary network pressure of return water rises；When actually detected value secondary network pressure reduction reduces with preset value difference, frequency conversion
Device output frequency declines, and circulating pump is operated in low frequency state, rises under secondary network pressure of return water.Go round and begin again, complete to circulation
The PID tracking of pump is automatically controlled, and makes circulating pump be operated in a more stable frequency state, realizes heat exchanger secondary side hot water
Constant control of the pipe network for backwater pressure reduction.
The control of heat exchange station system is a multi-level complex control system, and it is not merely with PID tracking control technologies
The temperature and pressure of water is controlled with reference to electric control valve and frequency converter, also at the information using control module to collection
Reason, and the control that 1# circulating pumps, 2# circulating pumps switch mutually is sent when circulation failure of pump or work period overlength.
1. the frequency conversion of circulating pump, the switching of power frequency working condition：
Circulating pump priority task, when control module receives the fault-signal of frequency converter, is controlled in variable frequency work state
Circulating pump is switched to power frequency working condition, and control frequency converter quits work and sends police instruction.
2. the standby switching control of 1# circulating pumps and 2# circulating pumps：
No matter circulating pump is operated in frequency conversion or power frequency state, when breaking down in 1# circulation pump works, control module
Control 2# circulation pump works, and make 1# circulating pumps quit work, carry out police instruction.Vice versa.
In heat exchange station run duration, to guarantee that circulating pump corrective maintenance work is carried out, make equipment in shape, control
Working time timing of the module to 1# pumps, controls 2# pump works, 1# pumps and quits work entrance after waiting the working time for reaching setting
Maintenance state.This control mode improves hommization, intelligence degree, is conducive to corrective maintenance, extends the service life of pump.
(3) the control of relief valve
Can manually and automatically be controlled, the operation button on control cabinet panel is placed in manual position and starts pressure release, in operation
Personnel or operator on duty have found that secondary side ductwork pressure is too high（More than safety value）When can manual pressure release；It is placed in automatic position, two
Secondary side pressure of return water opens relief valve higher than the overpressure protection sluicing pressure of touch display screen setting, less than protection pressure, closes
Relief valve.Protection main pipe rail that so can be manually strong with automatic two ways and user's pipeline, avoid high pressure to pipe
Road impact is damaged, and brings unnecessary safety and property loss.By the control to relief valve, maintain secondary network hydraulic pressure steady
It is scheduled in safe range.Control principle is shown in the control system figure of Fig. 4 circulatory systems.
3. moisturizing adjusts control loop
Moisturizing adjusts control loop and is mainly made up of small pump, frequency converter, water compensating valve, water tank etc., and its Main Function is
Under making supplement, accident conditions of the initial operating stage secondary pipe network full of water and the normal water leakage rate of run duration heating system
Moisturizing, is the necessary guarantee of heating system operation circulation to maintain the normal water supply pressure of secondary pipe network.Moisturizing regulating loop
It is the unlatching of small pump to be controlled by secondary pipe network pressure of return water sensor and frequency converter, is adjusted and is stopped to automatically control, real
The level pressure of existing secondary pressure of return water is automatically controlled；The water supply installation of water compensating valve and water tank composition provides strong guarantee to moisturizing.
The operation principle that moisturizing adjusts control loop is as shown in Figure 5.
(1) moisturizing pump frequency converting speed regulating constant DP control
Moisturizing pump frequency converting speed regulating constant DP control is changed according to the supplementing water pressure of heating system, changes moisturizing pumping source frequency
Rate, smooths and adjusts moisturizing revolution speed without polar region, and then adjusts rate of water make-up in time, realizes the constant of system return pressure.Small pump
VFC be also adopted by PID and adjust control, pid algorithm is same（Formula 3-3）, pid parameter is configured in advance.
See that Fig. 5 moisturizings adjust control loop system diagram.As seen from the figure, pressure transmitter is by the secondary network pressure of return water measured
Signal is fed back in processing module, with the given value signal of pressure（Secondary network pressure of return water sets）Compare, calculate defeated through PID
Go out a signal input in frequency converter, frequency converter is exported and give moisturizing pump motor automatically further according to the size of input signal values
Corresponding frequency values (0-50Hz), control to adjust the rotating speed of small pump, moisturizing pump discharge is changed therewith.When moisturizing pump discharge pressure
Power（That is secondary network pressure of return water）During less than setting pressure value, frequency of supply increases, and moisturizing revolution speed is improved, flow increase；Instead
It, flow is then reduced.If it exceeds setting pressure value then can autostop.Therefore, by controlling moisturizing revolution speed, moisturizing is changed
Pump discharge, and then ensure that heating system pressure is constant.
(2) small pump standby switching is automatically controlled
Water charging system has two small pumps, standby each other, controls circulating pump of the transfer principle with the circulatory system.Still using control
Molding block is processed, analyzed to the information for gathering, logic judgment and when moisturizing failure of pump or work period overlength
Send 1# small pumps, the control that 2# small pumps switch each other.
1. the frequency conversion of small pump, the switching of power frequency working condition：
Small pump priority task, when control module receives the fault-signal of frequency converter, is controlled in variable frequency work state
Small pump is switched to power frequency working condition, and control frequency converter quits work and sends police instruction.
2. the standby switching control of 1# small pumps and 2# small pumps：
No matter small pump is operated in frequency conversion or power frequency state, when breaking down in 1# moisturizing pump works, control module
According to the information processing control 2# moisturizing pump works for receiving, and make 1# small pumps quit work, carry out police instruction.Otherwise also
So.
In heat exchange station run duration, to guarantee that small pump corrective maintenance work is carried out, make equipment in shape, control
Working time timing of the module to 1# pumps, sends switching control 2# pump works, 1# pumps and stops after waiting the working time for reaching setting
Work enters maintenance state.
(3) the control of replenishing water tank of water
Replenishing water tank of water is controlled：Replenishing water tank of water bottom sides install a liquid level sensor, for measuring cistern water level.Water tank
One magnetic valve is installed, for water tank moisturizing on inlet channel.The opens solenoid valve when cistern water level is less than setting, works as Water in Water Tank
Magnetic valve is closed in position higher than when setting.Realize automatic water-supply, it is ensured that the timely moisturizing of secondary side, when liquid level is too low, send warning,
Staff is reminded to overhaul in time, it is to avoid secondary side water shortage occur, unnecessary damage is caused to system, play and effectively protect
Effect.
4. man-machine interactive system
Man-machine interactive system is mainly made up of touch display screen, is led to host computer processing module by communicating topological structure
News, complete data exchange, can both monitor the ruuning situation of heat-exchange unit, it is also possible to adjust the running status of heat-exchange unit.Touch
The interface for touching display screen shows including technological process total figure, regulating loop shows, setting value shows, alarm logging, historical trend
Figure shows, can carry out storage and retrieval to historical data.
Described technological process total figure shows, the carrying out practically of grasp heat-exchange unit that can be promptly and accurately in order to operator
Situation, can carry out real-time diagnosis to the failure of field apparatus.
All of safe regulating loop shows, is easy to operator to change control parameter, flexible to operation and with protection
Function.
Claims (1)
1. the moisturizing of a kind of heat exchange station automatic control system adjusts control loop, it is characterized in that：By being fixed on heat-exchange unit
Secondary side pressure of return water sensor, high water tank sensor, analysis and processing module, regulating valve PID module, control module, moisturizing
Pump, water compensating valve, frequency converter, touch-screen composition, the touch-screen passes through analysis and processing module, regulating valve PID module, control module
It is connected with frequency converter, the output end of frequency converter is connected respectively with 1# small pumps, 2# small pumps, 1# small pumps, the letter of 2# small pumps
Number end is connected respectively by holding wire with control module；The pressure of return water collection terminal of analysis and processing module by holding wire with it is secondary
Side pressure of return water sensor is connected, and the liquid level end of analysis and processing module is connected by holding wire with high water tank sensor；Analysis
The control end of processing module is connected by control module with water compensating valve；It is provided with the human-computer interaction interface of the touch-screen secondary
Side pressure of return water setting membrane keyboard, water tank lacks water protection setting membrane keyboard, small pump PID proportional gain settings membrane keyboards, moisturizing
Pump PID derivative times set membrane keyboard.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106123111A (en) * | 2016-08-16 | 2016-11-16 | 河南柴油机重工有限责任公司 | The moisturizing regulation of a kind of heat exchange station automatic control system controls loop and method |
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2016
- 2016-08-16 CN CN201620882039.5U patent/CN206094288U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106123111A (en) * | 2016-08-16 | 2016-11-16 | 河南柴油机重工有限责任公司 | The moisturizing regulation of a kind of heat exchange station automatic control system controls loop and method |
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Granted publication date: 20170412 Termination date: 20210816 |