CN206399939U - Constant temperature circulating dynamic analogue test of cooling water system - Google Patents
Constant temperature circulating dynamic analogue test of cooling water system Download PDFInfo
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- CN206399939U CN206399939U CN201720018335.5U CN201720018335U CN206399939U CN 206399939 U CN206399939 U CN 206399939U CN 201720018335 U CN201720018335 U CN 201720018335U CN 206399939 U CN206399939 U CN 206399939U
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Abstract
The utility model discloses a kind of constant temperature circulating dynamic analogue test of cooling water system, its drip irrigation device is, including collecting-tank, water supply tank and dosing tank, the pipeline to form circulation loop is connected with collecting-tank, water pump is connected with turn on the loop of the pipeline, eddy-current flowmeter, piece suspension device A, heat exchanger, piece suspension device B, cooling tower, the heat exchanger is parallel with boiler, blow-off pipe is connected with rear side of piece suspension device B, the temperature cascade control system is provided between the entrance of the heat exchanger and the bottom of towe of cooling tower, according to the closed loop, so that the OP values of inlet temperature control loop are set directly as the SP in column bottom temperature loop, to solve the lag issues of inlet temperature.The OP values of column bottom temperature control loop are exported under automatic condition to field control blower fan.And then the signal of change is not had also the inlet temperature of heat exchanging device to impact and is just inhibited by, this control mode largely improves the control accuracy of inlet water temperature.
Description
Technical field
The utility model is related to measurement analytical equipment field, more particularly to a kind of constant temperature circulating dynamic analogue test of cooling water
System.
Background technology
Generally all it is to design the experimental rig of a set of simulation to realize system before the actual input application of recirculated cooling water
Control is required.
At present, Publication No. CN203786108U Chinese patent discloses a kind of dynamic analogue test of cooling water device,
Including cistern, the water supply tank and dosing tank being connected with cistern, and the inlet tube and outlet tube being connected with cistern, inlet tube and outlet tube
Between provided with heater and the condenser that is connected with heater, be respectively equipped with import lacing film on tube, heater inlet and outlet pipe
Circulating pump, regulating valve are additionally provided with device, outlet piece suspension device, import thermometric and flowmeter, outlet thermometric and flowmeter, outlet pipe,
Water inlet pipe is provided with cooling tower and blow-off pipe, is provided with developmental tube in heater, the entrance point and the port of export of the developmental tube respectively with
Pipe joint the inner of heater both sides is flexibly connected, and the outer end of two pipe joints is connected with water inlet pipe and outlet pipe respectively.
Condenser in this dynamic analogue test of cooling water device is one kind in heat exchanger, prolonged work, meeting
Excessive precipitation is caused to be attached on the inwall of heat exchanger, then the heat transfer effect between saturated vapor and recirculated cooling water will
It is deteriorated, outlet temperature will reduce, because recirculated water by heat exchanger is directly entered cooling tower, so when recirculated water is into cooling tower
Temperature can also decrease.
Import temperature measurement location sets high limit alarm, can be alarmed when inlet temperature exceedes ± 0.3 degree Celsius of setting value,
The reason for this kind of the occurrence of be because：When the inlet temperature of heat exchanger is arranged on 32 DEG C, by testing the reality measured
Temperature has ± 0.3 DEG C of deviation, because there is the delayed of 20min or so in control passage, so that temperature is produced partially
Difference, the accurate control of final influence system, obtained detection data are deviated.
Utility model content
The purpose of this utility model is to provide a kind of constant temperature circulating dynamic analogue test of cooling water system, and it has measurement essence
The advantage that degree is high, control mode is good.
Above-mentioned technical purpose of the present utility model technical scheme is that：
On a kind of constant temperature circulating dynamic analogue test of cooling water system, including collecting-tank, water supply tank and dosing tank, collecting-tank
It is connected with the pipeline to form circulation loop, the loop of the pipeline and is connected with water pump, eddy-current flowmeter, piece suspension device A, heat exchange in turn
Device, piece suspension device B, cooling tower, the heat exchanger are parallel with rear side of boiler, piece suspension device B and are connected with blow-off pipe, the heat exchanger
The temperature cascade control system is provided between entrance and the bottom of towe of cooling tower, the temperature cascade control system includes：
Master variable：The inlet temperature of heat exchanger, the controlled variable played a leading role in cascade control system；
Secondary variable：In order to stablize the auxiliary variable of inlet temperature in the cofferdam temperature of bottom of towe bottom, cascade control system；
Main object：Blower fan；
Secondary object：Column bottom temperature；
Master controller：Worked by the measured value of inlet temperature with the actual set-point of inlet temperature, its output is used as bottom of towe
The controller of the cofferdam temperature given value of bottom；
Submaster controller：Its set-point carrys out the output of autonomous controller, and by bottom of towe bottom cofferdam temperature measured value with
The deviation of set-point and the controller for adjusting work；
Actuator：Frequency conversion heater, it increases and decreases heating-up temperature according to submaster controller；
Major loop：By the measurement pick-up device of master variable, major and minor controller, constitute outer time of actuator and major and minor object
Road；
Subloop：By the measurement pick-up device of secondary variable, the inner looping that submaster controller actuator and secondary object are constituted.
It is arranged such, it is as follows by above-mentioned control process, it is whole when the temperature when recirculated water enters cooling tower changes
Subloop in individual control process is first begin to effect so that the inlet temperature that the signal of change does not have heat exchanging device also is impacted
Just it is inhibited by, this control mode largely improves the control accuracy of inlet water temperature.In the mistake entirely controlled
Cheng Zhong, if the temperature in cofferdam is maintained at stable state, the temperature in collecting-tank is just stabilized substantially.Such control
Mode allows for the water approximately constant temperature in collecting-tank, and the normal operation to whole device plays critically important effect.
Brief description of the drawings
Fig. 1 is the system schematic of constant temperature circulating dynamic analogue test of cooling water system；
Fig. 2 is the temperature cascade control system principle schematic；
Fig. 3 is the temperature cascade control system real work figure in this programme.
In figure, 1, collecting-tank；2nd, water supply tank；3rd, dosing tank；4th, water pump；5th, eddy-current flowmeter；6th, heat exchanger；7th, cool down
Tower；8th, boiler；9th, blow-off pipe；10th, the temperature cascade control system；11st, master variable；12nd, secondary variable；13rd, main object；14th, it is secondary right
As；15th, master controller；16th, submaster controller；17th, actuator；18th, major loop；19th, subloop.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
Embodiment 1：A kind of constant temperature circulating dynamic analogue test of cooling water system, as shown in figure 1, including collecting-tank 1, moisturizing
Be connected with case 2 and dosing tank 3, collecting-tank 1 on the pipeline to form circulation loop, the loop of the pipeline be connected with turn water pump 4,
Eddy-current flowmeter 5, piece suspension device A, heat exchanger 6, piece suspension device B, cooling tower 7, the heat exchanger 6 are parallel with boiler 8, piece suspension device B's
Rear side is connected with blow-off pipe 9,
Above-mentioned operation principle is cooled down with a kind of disclosed in prior art or Publication No. CN203786108U Chinese patent
Water dynamic simulation tester is similar, and the principle of each several part is：Actual life is simulated with the detection of the entry and exit temperature of heat exchanger 6
Produce the heat transfer boundary condition of device；What the thermal medium in simulation test device running was selected is saturated vapor, for simulating reality
Heating material in production；Heat exchanger 6 in selection heat transfer test tube simulation actual production, its convenient disassembly, weighing are easy, then
Heat transfer test tube is placed in the generator of steam, saturated vapor is surrounded heat transfer test tube, for automatic detection and computing system
Dirtiness resistance value, pH value and electrical conductivity etc..Suitable dosing regimen is calculated and determined according to these values in system automatically, and controls
Measuring pump and dosing pump carry out Automatic Dosing, so as to reach the purpose of corrosion-mitigation scale-inhibition；System is by controlling frequency converter frequency conversion control
The rotating speed of water circulating pump 4 processed makes recirculated water by the test tube that conducts heat so as to control the flow of recirculated water it is kept stable
When heat absorption heating, then through cooling tower 7 flow into collecting-tank 1, the work so moved in circles.Again because by heat absorption heating
Recirculated water in cooling tower 7 be cooled when, its cycles of concentration can change, so system can automatically control blowoff valve
Unlatching/closing carry out blowdown, after blowdown, the water level of collecting-tank 1 can change, by controlling water supply tank 2 can
Moisturizing is carried out automatically according to the water level of collecting-tank 1, the water level of collecting-tank 1 is maintained at stable state.
When the inlet temperature and actual temperature of heat exchanger 6 have deviation, the system employs inlet temperature and column bottom temperature
The scheme of serials control is optimized.
As shown in Figures 2 and 3, the temperature cascade control system is provided between the bottom of towe of the entrance of heat exchanger 6 and cooling tower 7
10, the temperature cascade control system 10 includes：
Master variable 11：The inlet temperature of heat exchanger 6, the controlled variable played a leading role in cascade control system；
Secondary variable 12：In order to stablize the auxiliary variable of inlet temperature in the cofferdam temperature of bottom of towe bottom, cascade control system；
Main object 13：Blower fan；
Secondary object 14：Column bottom temperature；
Master controller 15：Worked by the measured value of inlet temperature with the actual set-point of inlet temperature, its output is used as tower
The controller of the cofferdam temperature given value of bottom bottom；
Submaster controller 16：Its set-point comes the output of autonomous controller 15, and the measurement of the cofferdam temperature by bottom of towe bottom
Value and the deviation of set-point and the controller for adjusting work；
Actuator 17：Frequency conversion heater, it increases and decreases heating-up temperature according to submaster controller 16；
Major loop 18：By the measurement pick-up device of master variable 11, master controller 15, submaster controller 16, actuator 17 and master
The external loop that object 13, secondary object 14 are constituted；
Subloop 19：By the measurement pick-up device of secondary variable 12, the actuator 17 of submaster controller 16 and secondary object 14 are constituted
Inner looping.
The control process of the temperature cascade control system 10 is as follows, and the temperature when recirculated water enters cooling tower 7 changes
When, subloop 19 in whole control process is first begin to effect as closed loop, according to the closed loop so that entrance temperature
The OP values for spending control loop are set directly as the SP in column bottom temperature loop, to solve the lag issues of inlet temperature.Bottom of towe
The OP values of temperature control loop are exported under automatic condition to field control blower fan.And then cause the signal of change not have heat exchanging also
The inlet temperature of device 6, which is impacted, to be just inhibited by, and this control mode largely improves the control of inlet water temperature
Precision processed.
During whole control, if the temperature in cofferdam is maintained at stable state, the temperature in collecting-tank 1
Substantially just stabilize.Such control mode allows for the water approximately constant temperature in collecting-tank 1, and the normal operation to whole device rises
Critically important effect.
In addition, the main interference of major loop 18 is the change and air-flow change of device environment temperature, and general device
Interior is all installed on, so for the control of temperature, the influence of these interference is very little, so as to ensure the control of inlet temperature
Precision.
The above embodiments are only to explain of the present utility model, and it is not to limitation of the present utility model, ability
Field technique personnel can make the modification without creative contribution to the present embodiment as needed after this specification is read, but
As long as all being protected in right of the present utility model by Patent Law.
Claims (1)
1. a kind of constant temperature circulating dynamic analogue test of cooling water system, including collecting-tank (1), water supply tank (2) and dosing tank (3),
It is connected with collecting-tank (1) on the pipeline to form circulation loop, the loop of the pipeline and is connected with water pump (4), vortex flow in turn
(5), piece suspension device A, heat exchanger (6), piece suspension device B, cooling tower (7) are counted, the heat exchanger (6) is parallel with boiler (8), piece suspension device B
Rear side be connected with blow-off pipe (9), it is characterised in that：It is provided between the entrance of the heat exchanger (6) and the bottom of towe of cooling tower (7)
The temperature cascade control system (10), the temperature cascade control system (10) includes：
Master variable (11)：The inlet temperature of heat exchanger (6), the controlled variable played a leading role in cascade control system；
Secondary variable (12)：In order to stablize the auxiliary variable of inlet temperature in the cofferdam temperature of bottom of towe bottom, cascade control system；
Main object (13)：Blower fan；
Secondary object (14)：Column bottom temperature；
Master controller (15)：Worked by the measured value of inlet temperature with the actual set-point of inlet temperature, its output is used as bottom of towe
The controller of the cofferdam temperature given value of bottom；
Submaster controller (16)：Its set-point comes the output of autonomous controller (15), and the measurement of the cofferdam temperature by bottom of towe bottom
Value and the deviation of set-point and the controller for adjusting work；
Actuator (17)：Frequency conversion heater, it increases and decreases heating-up temperature according to submaster controller (16)；
Major loop (18)：By the measurement pick-up device of master variable (11), major and minor controller（15）(16), actuator (17) and it is main,
Secondary object（13）(14) external loop constituted；
Subloop (19)：By the measurement pick-up device of secondary variable (12), submaster controller (16), actuator (17) and secondary object (14)
The inner looping constituted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720018335.5U CN206399939U (en) | 2017-01-07 | 2017-01-07 | Constant temperature circulating dynamic analogue test of cooling water system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720018335.5U CN206399939U (en) | 2017-01-07 | 2017-01-07 | Constant temperature circulating dynamic analogue test of cooling water system |
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| Publication Number | Publication Date |
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| CN206399939U true CN206399939U (en) | 2017-08-11 |
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| CN201720018335.5U Active CN206399939U (en) | 2017-01-07 | 2017-01-07 | Constant temperature circulating dynamic analogue test of cooling water system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398526A (en) * | 2020-03-31 | 2020-07-10 | 广东省石油与精细化工研究院 | Recirculated cooling water monitoring heat transfer system |
| CN112327605A (en) * | 2020-10-27 | 2021-02-05 | 武汉智能装备工业技术研究院有限公司 | Temperature control system and method for constant temperature device |
-
2017
- 2017-01-07 CN CN201720018335.5U patent/CN206399939U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111398526A (en) * | 2020-03-31 | 2020-07-10 | 广东省石油与精细化工研究院 | Recirculated cooling water monitoring heat transfer system |
| CN112327605A (en) * | 2020-10-27 | 2021-02-05 | 武汉智能装备工业技术研究院有限公司 | Temperature control system and method for constant temperature device |
| CN112327605B (en) * | 2020-10-27 | 2023-02-28 | 武汉微环控技术有限公司 | Temperature control system and method for constant temperature device |
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