CN104807186B - Gas field gathering engineering hole top heating furnace system and autocontrol method - Google Patents
Gas field gathering engineering hole top heating furnace system and autocontrol method Download PDFInfo
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- CN104807186B CN104807186B CN201510077856.3A CN201510077856A CN104807186B CN 104807186 B CN104807186 B CN 104807186B CN 201510077856 A CN201510077856 A CN 201510077856A CN 104807186 B CN104807186 B CN 104807186B
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Abstract
The invention discloses a kind of gas field gathering engineering hole top heating furnace system, including open tank body, tank base to be provided with heater；Tank interior is provided with one-level heating coil and two level heating coil；The one-level heating coil both ends are connected with one-level water inlet pipe and primary effluent pipe respectively, and the two level heating coil is connected with primary effluent pipe and secondary effluent pipe respectively；It is characterized in that：Two-step throttle valve is installed on the one-level water inlet pipe, three-level choke valve is installed on primary effluent pipe；Pressure inductor P1, temperature inductor T1 are provided with before the two-step throttle valve；Pressure inductor P2, temperature inductor T2 are provided between two-step throttle valve and one-level coil pipe；Pressure inductor P3, temperature inductor T3 and flowmeter Q3 are provided with after two level heating coil；The heater is gas-operated thermal bath facility；The heater is provided with intake valve.And the autocontrol method of the system, including flow control, Stress control, temperature control.
Description
Technical field
The present invention relates to a kind of method that gas field gathering engineering hole top heating furnace system and automatic control control the heating furnace.
Background technology
Gas heating furnace is widely used in gas gathering and transportation system as a kind of important firing equipment of oil gas field
In.Its operation principle is to be used as heating medium by the water in heating furnace, heats the natural-gas transfer pipeline in water, so that pipe
Natural gas reaches certain temperature, pressure and flow in road, prevents that reducing pressure by regulating flow forms Hydrate Plugging in fuel gas transportation pipeline
Pipeline.Domestic many gas field category high sour gas wells, face many high risk factors such as severe toxicity, severe corrosive, make safety in exploitation
As the pacing factor of relation engineering construction success or failure.Import heating furnace automatic control system used in current domestic gas field,
The accurate metering of acid gas fixed output quota, voltage stabilizing and flow can not be realized, acid gas heating effect is poor, heating furnace can be caused to stop when serious
Stove, closing well.
The content of the invention
For above-mentioned technical problem, the present invention provides a kind of gas field gathering engineering hole top heating furnace system and automatic
Control method, for intelligent automatic its flow of control, pressure and temperature.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：A kind of gas field gathering engineering well head heating
Furnace system, including open tank body, tank base are provided with heater；Tank interior is provided with one-level heating coil and two
Level heating coil；The one-level heating coil both ends are connected with one-level water inlet pipe and primary effluent pipe respectively, the two level heating
Coil pipe is connected with primary effluent pipe and secondary effluent pipe respectively；It is characterized in that：Two level section is installed on the one-level water inlet pipe
Valve is flowed, three-level choke valve is installed on primary effluent pipe；Pressure inductor P1, temperature sense are provided with before the two-step throttle valve
Answer device T1；Pressure inductor P2, temperature inductor T2 are provided between two-step throttle valve and one-level coil pipe；Two level heating coil it
After be provided with pressure inductor P3, temperature inductor T3 and flowmeter Q3；The heater is gas-operated thermal bath facility；It should add
Thermal is provided with intake valve.
A kind of autocontrol method for above-mentioned gas field gathering engineering hole top heating furnace system, including flow control, pressure
Power control, temperature control.
As an improvement the flow is the step of control:
Step 1, a flow preset value Qset is determined；
Step 2, periodic samples are carried out to Q3；
Step 3, bring sampled result into PID control formula and calculate controlled quentity controlled variable；The PID control formula is u (t)=Kp [e
(t)+1/TI∫e(t)dt+TD*de(t)/dt] ；
Step 4, two-step throttle valve opening is adjusted by controlled quentity controlled variable.
As an improvement further improve, and in the flow rate-determining steps 3, proportional parts in PID control formula
It is provided with intelligent control COEFFICIENT K int, i.e. u (t)=KintKpe (t)；As E (t) >=5%, Kint=0.5;As E (t)≤5%,
Kint=（10/ Qset）(Σ┃e(t)┃/n)；E(t)= (Σ┃e(t)┃/n)/Qset.
Further improved as another, in the flow rate-determining steps 3, integration amount part in PID control formula
It is provided with intelligent control coefficient Hint, i.e. i (t)=Hint (1/Ti) ∫ e (t) dt；As E (t) >=5%, Hint=0.5;When
During 1%≤E (t)≤5%, Hint=（10/ Qset）(Σ┃e(t)┃/n)=10E(t)；As E (t)≤1%, Hint=0.1；E(t)=
(Σ┃e(t)┃/n)/Qset.For traditional PID control, P, I, D pre-set parameter are all static fixed values, for list
The variable quantity of one control is applicable, but the coupling of multivariable control is just dying, and in order to prevent from controlling hyperharmonic dead band, right
PID parameter is needed to set into Mobile state, i.e. the adjustment parameter value of PID is set with the difference of actual feedback in proportion according to control
It is automatic to calculate.
Improved as another kind, be the step of the Stress control:
Step 1, a pressure preset Pset is determined；
Step 2, periodic samples are carried out to P2；
Step 3, bring sampled result into PID control formula and calculate controlled quentity controlled variable；The PID control formula is u (t)=Kp [e
(t)+1/TI ∫ e (t) dt+TD*de (t)/dt], wherein E (t)=(Σ ┃ e (t) ┃/n)/Pset；
Step 4, three-level throttle valve opening is adjusted by controlled quentity controlled variable.
Further improved as above-mentioned improvement, in the pressure controlling step 3, proportional parts is set in PID control formula
It is equipped with intelligent control COEFFICIENT K int, i.e. u (t)=KintKpe (t)；As E (t) >=5%, Kint=0.5;As E (t)≤5%,
Kint=（10/ Pset）(Σ┃e(t)┃/n)；E(t)= (Σ┃e(t)┃/n)/Pset.
Further improve as above-mentioned improvement another kind, in the pressure controlling step 3, integrated in PID control formula
Amount part is provided with intelligent control coefficient Hint, i.e. i (t)=Hint (1/Ti) ∫ e (t) dt；As E (t) >=5%, Hint=
0.5;As 1%≤E (t)≤5%, Hint=（10/ Pset）(Σ┃e(t)┃/n)=10E(t)；As E (t)≤1%, Hint=
0.1；E(t)= (Σ┃e(t)┃/n)/Pset.For traditional PID control, P, I, D pre-set parameter are all static fixations
Value, is applicable for the variable quantity of single control, but the coupling of multivariable control is just dying, and in order to prevent from controlling overshoot
And dead band, PID parameter is needed to set into Mobile state, i.e. the adjustment parameter value of PID is according to control setting and actual feedback
Difference calculates automatically in proportion.
Improved as another kind, be the step of the temperature control：
Step 1, outlet temperature preset value tset1, the inlet temperature preset value of secondary coil of secondary coil are determined
Tset2, bath temperature preset value tset3；
Step 2, periodic samples are carried out to T1, T2, T3；
Step 3, bring sampled result into PID control formula and calculate controlled quentity controlled variable；The PID control formula is u (t)=Kp
[Kinte(t)+Hint(1/Ti)∫e(t)dt+Td(de(t)/dt)]；As E (t) >=5%, Kint=0.5;When E (t)≤5%
When, Kint=（10/ Tset）(Σ┃e(t)┃/n)；As E (t) >=5%, Hint=0.5;As 1%≤E (t)≤5%, Hint=
（10/ Tset）(Σ┃e(t)┃/n)=10E(t)；As E (t)≤1%, Hint=0.1；E(t)= (Σ┃e(t)┃/n)/Tset;
Tset=tset1,tset2,tset3。
Step 4, the PID first formed the outlet temperature preset value of the outlet temperature of secondary coil and secondary coil is exported
Value, compared with the PID output valves that the inlet temperature of secondary coil and the inlet temperature preset value of secondary coil are formed, selection
Larger value in both, then compared with bath temperature and bath temperature preset value formation PID output valves, it is less in both selections
Value；
Step 5, the pid value obtained using step 4 controls the aperture of intake valve.
The present invention is advantageous in that：Because intelligence control system uses PID Intelligent Fuzzy Controls, solves multivariable
The technical problem interfered, it is truly realized the uneoupled control of multivariable.Flow, pressure, temperature are set in the artificial adjustment of progress
After determining or being fluctuated due to process environments running parameter, dynamic equilibrium can be realized in a short time.So that flow system flow, pressure
Power, temperature dynamic change are gentle, stable.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is conventional PID control and variable proportion coefficient effect contrast figure.
Fig. 3 is conventional PID control and variable integration coefficient effect contrast figure.
Marked in figure：1 tank body, 2 heaters, 3 one-level heating coils, 4 two level heating coils, 5 one-level water inlet pipes, 6 one
Level outlet pipe, 7 secondary effluent pipes, 8 two-step throttle valves, 9 three-level choke valves, 10 pressure inductor P1,11 temperature inductor T1,12
Pressure inductor P2,13 temperature inductor T2,14 pressure inductor P3,15 temperature inductor T3,16 flowmeter Q3,17 air inlets
Valve.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is described in detail.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
PID controller（Proportional-integral derivative controller）It is a common backfeed loop portion in Industry Control Application
Part, it is made up of proportional unit P, integral unit I and differentiation element D.
This it is theoretical and application it is crucial that make correctly measurement and relatively after, how could preferably correcting system.
PID（Ratio（proportion）, integration（integration）, differential（differentiation））Controller is made
Currently still it is most widely used industrial control unit (ICU) for the existing last 100 yearses history of controller practical earliest.PID controller
It is easily understood, the prerequisites such as accurate system model is not required in use, thus as the controller being most widely used.
PID controller is by proportional unit（P）, integral unit（I）And differentiation element（D）Composition.It inputs e (t）With output
u (t）Relation be that the bound that integrates is 0 and t respectively in u (t)=Kp [e (t)+1/TI ∫ e (t) dt+TD*de (t)/dt] formula
Therefore its transmission function is：G(s)=U(s)/E(s)=Kp[1+1/(TI*s)+TD*s].Wherein Kp is ratio system
Number；TI is integration time constant；TD is derivative time constant.
As shown in figure 1, gathering engineering hole top heating furnace system in gas field of the present invention, including open tank body 1, the bottom of tank body 1
Portion is provided with heater 2；One-level heating coil 3 and two level heating coil 4 are installed inside tank body 1；The one-level heating dish
The both ends of pipe 3 are connected with one-level water inlet pipe 5 and primary effluent pipe 6 respectively, the two level heating coil 4 respectively with primary effluent pipe 6
Connected with secondary effluent pipe 7；Two-step throttle valve 8 is installed on the one-level water inlet pipe 5, three-level is installed on primary effluent pipe 6
Choke valve 9；Pressure inductor P1, temperature inductor T1 are provided with before the two-step throttle valve 8；Two-step throttle valve 8 and one-level
Pressure inductor P2, temperature inductor T2 are provided between heating coil 3；Pressure sensitive is provided with after two level heating coil 4
Device P3, temperature inductor T3 and flowmeter Q3；The heater 2 is gas-operated thermal bath facility；The heater 2 be provided with into
Air valve 17.
Crucial control object according to production requirement Q3, P2, T3, and Q3, P2 simultaneously all with two level three-level choke valve
Aperture is relevant, and any one valve events can all influence Q3 and P2 simultaneously, and regulation flow can cause pressure oscillation, it is same to adjust pressure
Sample can also cause changes in flow rate.Changes in flow rate can also influence the control of temperature, and then influence the working condition of heating furnace.According to this
One process characteristic, in general automatically controls can not realize stable control, need solve multivariable using intelligent control
The technical problem interfered.
The invention further relates to a kind of autocontrol method for above-mentioned gas field gathering engineering hole top heating furnace system, including
Flow control, Stress control, temperature control.
The step of flow controls be:
Step 1, a flow preset value Qset is determined；Determine that a preset value is used for as mark post, the preset value first
And actual sample value compares so as to obtain deviation.We preset the m3/h of Qset=50 herein.
Step 2, periodic samples are carried out to Q3；We assume that system scans three cycles, first cycle flow value is
30m3/h, second period flow value are 35m3/h, and the 3rd cycle flow value is 40m3/h.And pass through on-site signal inductor
Physical quantity is converted into the 4-20mA DC signal currents of standard, 4mA corresponds to physical quantity range lower bound, and 20mA corresponds to physical quantity amount
The high limit of journey, signal code are directly accessed intelligence control system Analog input mModule by connection cables, and data sampling is completed.Than
Such as：Flow sensor 0 ~ 70m3/h of range, 4 ~ 20mA of corresponding signal code, if flow signal electric current is 12mA, that is, flows
Quantity sensor is 35 m3/h.
Step 3, bring sampled result into PID control formula and calculate controlled quentity controlled variable；The PID control formula is u (t)=Kp [e
(t)+1/TI∫e(t)dt+TD*de(t)/dt] ；Proportional parts sets intelligent control coefficient preferably in PID control formula
Kint, i.e. u (t)=KintKpe (t)；As E (t) >=5%, Kint=0.5;As E (t)≤5%, Kint=（10/ Qset）(Σ
┃e(t)┃/n)；E(t)= (Σ┃e(t)┃/n)/Qset.And integration amount part is provided with intelligent control in PID control formula
Coefficient Hint, i.e. i (t)=Hint (1/Ti) ∫ e (t) dt；As E (t) >=5%, Hint=0.5;As 1%≤E (t)≤5%,
Hint=（10/ Qset）(Σ┃e(t)┃/n)=10E(t)；As E (t)≤1%, Hint=0.1；E(t)= (Σ┃e(t)┃/n)/
Qset.Three cycles total relative deviation absolute value average is Σ ┃ e (t) ┃/n, i.e.,（┃（50-30）┃+┃（50-35）┃+┃（50-
40）┃）/3=15 m³/h.E (t)=(Σ ┃ e (t) ┃/n)/Qset=15/50=30% >=5%, so Kint=0.5, Hint=
0.5.PID formula are u (t)=Kp [(1/Ti) the ∫ e (t) of 0.5e (t)+0.5 dt+Td (de (t)/dt)].PID logic arithmetic system has
The functional block of standard, only needs input feedback value, setting value, pid parameter value etc., and system standard function just can be according to value of feedback with setting
Definite value deviation, it is automatic to calculate output correction value（That is PID output valves）.
Step 4, controlled quentity controlled variable is passed through（PID output valves）Adjust two-step throttle valve opening.This step is correction process, so-called to entangle
Partially, it is exactly actual value and when setting value has deviation, deviation is become small or is eliminated by control.System is actual flow value and system
Set flow value to compare, correction output valve is exported by pid control module, then output valve is passed through system simulation amount output module
The 4-20mA signal codes of standard are converted into, control the aperture of two-step throttle valve, be i.e. 4mA corresponds to valve opening 0%, and 20mA is corresponding
Valve opening 100%.Such as：Flow set is 50 m3/h, throttle valve opening 50%, and now value of feedback is less than 50 m3/h,
PID correction output valve increases, control are gradually increased aperture, and flow increases, after flow setting value is reached, PID correction output valves
Keep constant, bigger than setting value if instead actual flow feedback is more than 50 m3/h now, PID correction output valves reduce, control
System is gradually reduced aperture, and flow reduces, and after flow setting value is reached, PID correction output valves keep constant.This control system
PID output valve corresponding current value linear relationships are that output valve 0-27648 corresponds to 4-20mA.
The control of flow is in addition to two-step throttle valve opening controls, also other alarming logic controls, acid gas（Collection adds
Hot natural gas）And combustion gas（Heating furnace burning is used）Independently, there is two-step throttle downstream pressure height or three-level in acid gas for control
The downstream pressure that throttles is high, and intelligence control system can all close two-step throttle valve immediately, prevent pipeline burst.When there is intake air temperature
Before and after low, three-level choke valve during the operating mode such as thermo-field thoery or ultralow, air outlet temperature superelevation, fuel gas detection superelevation, system is only
Alarm, does not close two-step throttle valve.
The step of Stress control is:
Step 1, a flow preset value Pset is determined；Determine that a preset value is used for as mark post, the preset value first
And actual sample value compares so as to obtain deviation.We preset Pset=15Mpa herein.
Step 2, periodic samples are carried out to P2；We assume that system scans three cycles, first cycle flow value is
14.8Mpa, second period flow value are 15Mpa, and the 3rd cycle flow value is 15.1Mpa.And sensed by on-site signal
Device is converted into physical quantity the 4-20mA DC signal currents of standard, and 4mA corresponds to physical quantity range lower bound, and 20mA corresponds to physical quantity
The high limit of range, signal code are directly accessed intelligence control system Analog input mModule by connection cables, and data sampling is completed.
Such as：Pressure sensor 0 ~ 25Mpa of range, corresponding signal code 4 ~ 20mA, present pressure signal electric current 12mA, that is, pressure
Sensor is 12.5Mpa.
Step 3, bring sampled result into PID control formula and calculate controlled quentity controlled variable；The PID control formula is u (t)=Kp [e
(t)+1/TI∫e(t)dt+TD*de(t)/dt] ；Proportional parts sets intelligent control coefficient preferably in PID control formula
Kint, i.e. u (t)=KintKpe (t)；As E (t) >=5%, Kint=0.5;As E (t)≤5%, Kint=（10/ Pset）(Σ
┃e(t)┃/n)；E(t)= (Σ┃e(t)┃/n)/ Pset.And integration amount part is provided with intelligent control in PID control formula
Coefficient Hint processed, i.e. i (t)=Hint (1/Ti) ∫ e (t) dt；As E (t) >=5%, Hint=0.5;When 1%≤E (t)≤5%
When, Hint=（10/ Pset）(Σ┃e(t)┃/n)=10E(t)；As E (t)≤1%, Hint=0.1；E(t)= (Σ┃e(t)┃/
n)/Pset.Three cycles total relative deviation absolute value average is Σ ┃ e (t) ┃/n, i.e.,（┃（15-14.8）┃+┃（15-15）┃+┃
（15-15.1）┃）/3=0.1 Mpa.E (t)=(Σ ┃ e (t) ┃/n)/Pset=0.1/15=0.67%, so Kint=1/150,
Hint=0.1.PID formula are u (t)=Kp [(1/Ti) the ∫ e (t) of 1/150e (t)+0.1 dt+Td (de (t)/dt)].PID logic is transported
Calculation system has the functional block of standard, only needs input feedback value, setting value, pid parameter value etc., and system standard function just can be according to anti-
Feedback value and setting value deviation, it is automatic to calculate output correction value（That is PID output valves）.PID logic arithmetic system has the function of standard
Block, only needs input feedback value, setting value, pid parameter value etc., system standard function just can according to value of feedback and setting value deviation,
It is automatic to calculate output correction value（That is PID output valves）.PID output valves can be on the occasion of negative value or 0.
Step 4, controlled quentity controlled variable is passed through（PID output valves）Adjust three-level throttle valve opening.This step is correction process, so-called to entangle
Partially, it is exactly actual value and when setting value has deviation, deviation is become small or is eliminated by control.System is actual flow value and system
Set flow value to compare, correction output valve is exported by pid control module, then output valve is passed through system simulation amount output module
The 4-20mA signal codes of standard are converted into, control the aperture of two-step throttle valve, be i.e. 4mA corresponds to valve opening 0%, and 20mA is corresponding
Valve opening 100%.Such as：Pressure is set as 15Mpa, and three-level throttle valve opening is 50%, and now value of feedback is less than 15Mpa,
PID correction output valve increases, control are gradually increased aperture, and flow increases, after flow setting value is reached, PID correction output valves
Constant, bigger than setting value if instead actual flow feedback is more than 15Mpa now, PID correction output valves reduce, and control is gradual
Reduce aperture, flow reduces, and after flow setting value is reached, PID correction output valves keep constant.This control system PID is exported
Value corresponding current value linear relationship is that output valve 0-27648 corresponds to 4-20mA.
The control of flow is in addition to three-level throttle valve opening controls, also other alarming logic controls, acid gas（Collection adds
Hot natural gas）And combustion gas（Heating furnace burning is used）Independently, there is two-step throttle downstream pressure height or three-level in acid gas for control
The downstream pressure that throttles is high, and intelligence control system can all close three-level choke valve immediately, prevent pipeline burst.When there is intake air temperature
Before and after low, three-level choke valve during the operating mode such as thermo-field thoery or ultralow, air outlet temperature superelevation, fuel gas detection superelevation, system is only
Alarm, does not close three-level choke valve.
The step of temperature control is：
Step 1, outlet temperature preset value tset1, the inlet temperature preset value of secondary coil of secondary coil are determined
Tset2, bath temperature preset value tset3；A preset value is determined first as mark post, and the preset value is used for and actual sample value
Compare so as to obtain deviation.We preset tset1=50 DEG C, test2=40 DEG C, test3=80 DEG C herein.
Step 2, periodic samples are carried out to T1, T2, T3；And physical quantity is converted into by on-site signal inductor by standard
4-20mA DC signal currents, 4mA corresponds to physical quantity range lower bound, and 20mA corresponds to the high limit of physical quantity range, and signal code leads to
Cross connection cables and be directly accessed intelligence control system Analog input mModule, data sampling is completed.With flow control and pressure control
System is the same, and in this step, each temperature sensor is scanned several times, and asks that direct current is believed by scanning gained temperature inversion
Number electric current.
Step 3, bring sampled result into PID control formula and calculate controlled quentity controlled variable；The PID control formula is u (t)=Kp
[Kinte(t)+Hint(1/Ti)∫e(t)dt+Td(de(t)/dt)]；As E (t) >=5%, Kint=0.5;When E (t)≤5%
When, Kint=（10/ Tset）(Σ┃e(t)┃/n)；As E (t) >=5%, Hint=0.5;As 1%≤E (t)≤5%, Hint=
（10/ Tset）(Σ┃e(t)┃/n)=10E(t)；As E (t)≤1%, Hint=0.1；E(t)= (Σ┃e(t)┃/n)/Tset;
Tset=tset1,tset2,tset3.Its calculation procedure duplicates with control of flow and pressure, first passes through preset value with actual from biography
The value that sensor obtains, pid parameter is obtained, is then calculated by PID modules.
Step 4, the PID first formed the outlet temperature preset value of the outlet temperature of secondary coil and secondary coil is exported
Value PID1, the PID output valves PID2 formed with the inlet temperature of secondary coil and the inlet temperature preset value of secondary coil are carried out
Compare, larger value in both selections, then compared with bath temperature and bath temperature preset value formation PID output valves PID3, choosing
Select less value in both.Such as：PID1 values are that 16000, PID2 values are that 9700, PID3 values are 21000, PID1>PID2, screening
Go out PID1, then PID1<PID3, therefore last PID corrections output is PID1 values 16000, corresponding output aperture electric current 13.275mA, it is right
Answer valve opening 57.97%.
Step 5, the pid value obtained using step 4 controls the aperture of intake valve.This step is correction process, so-called correction,
It is exactly actual value and when setting value has deviation, deviation is become small or is eliminated by control.System sets actual flow value with system
Constant current quantity value comparison, correction output valve is exported by pid control module, then output valve is turned by system simulation amount output module
Change the 4-20mA signal codes of standard into, control intake valve aperture, be i.e. 4mA corresponds to valve opening 0%, and 20mA corresponds to valve opening
100%。
In autocontrol method disclosed by the invention, using variable proportion coefficient（Kint）With variable integration coefficient
(Hint).Existing flow pressure control uses general PID control pattern.Because tandem coupled interference, easily cause to control
System is shaken.Disturb excessive or ratio and spend the problem of mostly appearance causes overshoot, concussion, big deviation（Foreign trader's debugging process occurs super
Pressure shut-off is exactly the performance of this problem）.Reduce makes convergence become excessively slow than regular meeting, is also easy to produce high frequency oscillation on small scale again.Such as Fig. 2
Shown, the system determines ratio using variable coefficient Kint, follows various situation adjust automatically scales, realizes quick steady
Surely target is restrained.Specific practice is to quote the average E (t) of COEFFICIENT K int and relative deviation absolute value, ratio is become with deviation.
Start-up portion is big, and control is very fast, and as deviation diminishes, control ratio diminishes, and convergence effect is more preferable, and residual sum fluctuating range is more
Small, control effect is more preferable.And the time of integration is too short, integration amount i (t) crosses conference and causes control fluctuation to accelerate or shake, during integration
Between oversize, integration amount i (t) it is too small that control can be caused to reply is slack-off, static difference eliminates slow.As shown in figure 3, the utilization of this control system can
Variable coefficient Hint determines the time of integration, can fast and stable convergence, the uneoupled control effect having had.Specific practice is to quote intelligence
Integral concept, change integrated intensity at random, deviation is bigger, integral action is stronger（The time of integration is shorter）, deviation is smaller, integration is made
With weaker（The time of integration is longer）.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (7)
1. a kind of autocontrol method for gas field gathering engineering hole top heating furnace system, described reheat furnace system includes opening
The tank body of formula is put, tank base is provided with gas-operated thermal bath facility, and heater is provided with intake valve, and tank interior is provided with one-level
Heating coil and two level heating coil, one-level heating coil both ends are connected with one-level water inlet pipe and primary effluent pipe respectively, two level
Heating coil is connected with primary effluent pipe and secondary effluent pipe respectively, and two-step throttle valve is provided with one-level water inlet pipe, and one-level goes out
Three-level choke valve is installed on water pipe, pressure inductor P1, temperature inductor T1, two-step throttle are provided with before two-step throttle valve
Pressure inductor P2, temperature inductor T2 are provided between valve and one-level coil pipe, feeling of stress is provided with after two level heating coil
Answer device P3, temperature inductor T3 and flowmeter Q3；It is characterized in that：Described autocontrol method includes temperature control, institute
The step of stating temperature control be：
Step 1, outlet temperature preset value tset1, inlet temperature preset value tset2, the water of secondary coil of secondary coil are determined
Bath temperature preset value tset3；
Step 2, periodic samples are carried out to T1, T2, T3；
Step 3, bring sampled result into PID control formula and calculate controlled quentity controlled variable；The PID control formula is u (t)=Kp [Kinte
(t)+Hint(1/Ti)∫e(t)dt+Td(de(t)/dt)]；As E (t) >=5%, Kint=0.5;As E (t)≤5%, Kint=
（10/ Tset）(Σ┃e(t)┃/n)；As E (t) >=5%, Hint=0.5;As 1%≤E (t)≤5%, Hint=（10/
Tset）(Σ┃e(t)┃/n)=10E(t)；As E (t)≤1%, Hint=0.1；E(t)= (Σ┃e(t)┃/n)/Tset; Tset=
tset1,tset2,tset3;
Step 4, the PID output valves first formed the outlet temperature preset value of the outlet temperature of secondary coil and secondary coil,
Compared with the PID output valves that the inlet temperature of secondary coil and the inlet temperature preset value of secondary coil are formed, two are selected
Larger value in person, then compared with bath temperature and bath temperature preset value formation PID output valves, it is less in both selections
Value；
Step 5, the pid value obtained using step 4 controls the aperture of intake valve.
2. the autocontrol method according to claim 1 for gas field gathering engineering hole top heating furnace system, its feature
It is：Also include flow to control, the step of flow controls is：
Step 1, a flow preset value Qset is determined；
Step 2, periodic samples are carried out to Q3；
Step 3, bring sampled result into PID control formula and calculate controlled quentity controlled variable；The PID control formula be u (t)=Kp [e (t)+
1/TI∫e(t)dt+TD*de(t)/dt] ；
Step 4, two-step throttle valve opening is adjusted by controlled quentity controlled variable.
3. the autocontrol method according to claim 2 for gas field gathering engineering hole top heating furnace system, its feature
It is：In the flow rate-determining steps 3, in PID control formula proportional parts be provided with intelligent control COEFFICIENT K int, i.e. u (t)=
KintKpe(t)；As E (t) >=5%, Kint=0.5;As E (t)≤5%, Kint=（10/ Qset）(Σ┃e(t)┃/n)；E
(t)= (Σ┃e(t)┃/n)/Qset。
4. the autocontrol method according to claim 2 for gas field gathering engineering hole top heating furnace system, its feature
It is：In the flow rate-determining steps 3, integration amount part is provided with intelligent control coefficient Hint, i.e. i in PID control formula
(t)= Hint(1/Ti)∫e(t)dt；As E (t) >=5%, Hint=0.5;As 1%≤E (t)≤5%, Hint=（10/
Qset）(Σ┃e(t)┃/n)=10E(t)；As E (t)≤1%, Hint=0.1；E(t)= (Σ┃e(t)┃/n)/Qset.
5. the autocontrol method according to claim 1 for gas field gathering engineering hole top heating furnace system, its feature
It is：Also include Stress control, be the step of the Stress control：
Step 1, a pressure preset Pset is determined；
Step 2, periodic samples are carried out to P2；
Step 3, bring sampled result into PID control formula and calculate controlled quentity controlled variable；The PID control formula be u (t)=Kp [e (t)+
1/TI ∫ e (t) dt+TD*de (t)/dt], wherein E (t)=(Σ ┃ e (t) ┃/n)/Pset；
Step 4, three-level throttle valve opening is adjusted by controlled quentity controlled variable.
6. the autocontrol method according to claim 5 for gas field gathering engineering hole top heating furnace system, its feature
It is：In the pressure controlling step 3, in PID control formula proportional parts be provided with intelligent control COEFFICIENT K int, i.e. u (t)=
KintKpe(t)；As E (t) >=5%, Kint=0.5;As E (t)≤5%, Kint=（10/ Pset）(Σ┃e(t)┃/n)；E
(t)= (Σ┃e(t)┃/n)/Pset。
7. the autocontrol method according to claim 5 for gas field gathering engineering hole top heating furnace system, its feature
It is：In the pressure controlling step 3, integration amount part is provided with intelligent control coefficient Hint, i.e. i in PID control formula
(t)= Hint(1/Ti)∫e(t)dt；As E (t) >=5%, Hint=0.5;As 1%≤E (t)≤5%, Hint=（10/
Pset）(Σ┃e(t)┃/n)=10E(t)；As E (t)≤1%, Hint=0.1；E(t)= (Σ┃e(t)┃/n)/Pset.
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| CN103809528A (en) * | 2012-11-08 | 2014-05-21 | 河南宏天实业有限公司 | Natural gas producing well production and pressure automatically adjusting intelligent control system |
| DE102013004231A1 (en) * | 2013-03-11 | 2014-09-11 | Karl Stefan Riener | HEATING STORE AND OVEN WITH HEAT STORAGE |
| CN203704373U (en) * | 2014-01-23 | 2014-07-09 | 杭州德联科技股份有限公司 | Oil or gas fired vacuum hot water boiler control system |
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