CN102661672A - Energy-saving plate heat exchanger unit and control method thereof - Google Patents
Energy-saving plate heat exchanger unit and control method thereof Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 132
- 238000004134 energy conservation Methods 0.000 claims description 42
- 230000009467 reduction Effects 0.000 claims description 30
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- 238000006243 chemical reaction Methods 0.000 description 12
- 230000000630 rising effect Effects 0.000 description 7
- 238000012546 transfer Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000008400 supply water Substances 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
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- 238000013459 approach Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000012467 final product Substances 0.000 description 1
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Abstract
The invention discloses an energy-saving plate heat exchanger unit and a control method thereof. The heat exchanger unit comprises a plate heat exchanger and a programmable logic controller (PLC), wherein one end of the plate heat exchanger is connected with a primary side water pipe; the other end of the plate heat exchanger is connected with a secondary side water pipe; a first pressure sensor is arranged at the outlet of the secondary side water pipe; a circulating pump and a second pressure sensor are arranged at the inlet of the secondary side water pipe; a first temperature sensor is also arranged at the outlet of the secondary side water pipe; a second temperature sensor is also arranged at the inlet of the secondary side water pipe; the input end of the PLC is connected with the pressure sensors and the temperature sensors; and the output end of the PLC is connected with the circulating pump through a frequency converter. According to the energy-saving plate heat exchanger unit and the control method thereof provided by the invention, limited pressure difference control is combined with fixed temperature difference control, and the hot water circulating output amount and the operating frequency of a water pump are determined in real time according to the change of the water amount or the hot load requirement of an air conditioner of a user, so that the effect of saving energy can be achieved when the outdoor ambient temperature is raised and the hot load requirement is reduced.
Description
Technical field
The present invention relates to a kind of heat exchange unit and control method thereof, relate in particular to a kind of energy-conservation plate-type heat-exchange unit and control method thereof.
Background technology
The application of plate type heat exchanger in industry has long history, and dominate in all heat exchangers still so far.Plate type heat exchanger is by certain intervals by the ripply thin plate of many punching presses; Pass through gasket seal all around; And form with framework and overlapping the compressing of fishbolt, the hole, four angles of plate and pad has formed the distributing pipe and the manifold trunk of fluid, reasonably cold fluid and hot fluid is separated again simultaneously; It is flowed in the runner of every plate both sides respectively, carry out heat exchange through plate.Plate type heat exchanger has following characteristics: 1) heat transfer coefficient is high: because different corrugated platings is inverted each other; Constitute complicated runner; Make fluid between corrugated plating, be the rotation Three-dimensional Flow in the runner; Can produce turbulent flow down at lower Reynolds number (general Re=50 ~ 200), so heat transfer coefficient is high, be commonly considered as shell-and-tube 3 ~ 5 times.2) logarithmic mean temperature difference (LMTD) is big; Terminal temperature difference is little: mostly plate type heat exchanger is and stream or counter-current flow mode; In addition, cold and hot fluid mobile in plate type heat exchanger is parallel to heat-transfer surface, no by-pass flow, therefore makes that the terminal temperature difference of plate type heat exchanger is little; Can be lower than 1 ℃ to the water heat exchange, and shell-and-tube heat exchanger is generally 5 ℃.3) floor space is little: the plate type heat exchanger compact conformation; Heat exchange area in the unit volume is 2 ~ 5 times of shell-and-tube; Also will reserve the maintenance place of extracting tube bank out unlike the shell-and-tube that kind, therefore realize same heat, the plate type heat exchanger floor space is about 1/5 ~ 1/8 of shell-and-tube heat exchanger.4) change heat exchange area or path combination easily, need only increase or reduce by several plates, can reach the purpose that increases or reduce heat exchange area; Change the plate arrangement or change several plates, can reach desired path combination, adapt to new heat exchange operating mode, and the heat transfer area of shell-and-tube heat exchanger possibly increase hardly.5) in light weight: the sheet of plate type heat exchanger is merely 0.4 ~ 0.8mm; And the thickness of the heat exchanger tube of shell-and-tube heat exchanger is 2.0 ~ 2.5mm; The housing of shell-and-tube is more than the framework recuperation of plate type heat exchanger, and plate type heat exchanger generally has only about 1/5 of shell-and-tube weight.6) price is low: adopt same material, under identical heat exchange area, the plate type heat exchanger price hangs down 40% ~ 60% approximately than shell-and-tube.7) easy to make: the heat transfer plate of plate type heat exchanger is to adopt punch process, and standardization level is high, but and mass production, the general employing of shell-and-tube heat exchanger made by hand.
One termination high temperature side water pipe of plate type heat exchanger, another termination low temperature side water pipe; The thermal medium import department of said high temperature side water pipe is provided with temperature-sensing valve; Said low temperature side water pipe is provided with circulating pump, and it is definite value that circulating pump power frequency operation, temperature-sensing valve are kept leaving water temperature T1.If outdoor environment temperature raises, return water temperature T2 can not make return water temperature T2 be transferred to a definite value with regard to corresponding rising, and user indoor temperature is also along with rising, and circulating pump power frequency stable operation always can not reach energy-conservation effect.
If user 1 and user 2 close, according to circulating pump self operating characteristic, total flow reduces to some extent; But user 3 and user's 4 flow still can increase, and then return water temperature T2 is raise, and user indoor temperature is also along with rising; Circulating pump is power frequency operation always, far can not reach fully energy-conservation effect.
For energy-conservation, plate type heat exchanger also has the level pressure of employing difference VFC: the circulating pump converting operation, keep outlet pressure P1, and 2 pressure reduction of pressure of return water P2 are definite value, it is definite value that temperature-sensing valve is kept leaving water temperature T1.
If outdoor environment temperature raises, return water temperature T2 can not make return water temperature T2 be transferred to a definite value with regard to corresponding rising; User indoor temperature is also along with rising, outlet pressure P1, and pressure of return water P2 point pressure is stable; Circulating pump is stable operation always, can not reach energy-conservation effect.
If user 1 and user 2 close, outlet pressure P1,2 pressure reduction of pressure of return water P2 raise; In order to keep pressure reduction is definite value, reduces the flow of pump through frequency converter, is transferred to setting value to pressure reduction; Make user 3 and user's 4 flow keep former flow unchanged, and then return water temperature T2 is remained unchanged, user indoor temperature remains unchanged; The circulating pump converting operation reaches energy-conservation effect.
This shows existing power frequency operation: under the situation that outdoor environment temperature raises and the user turn-offs, all do not reach energy-conservation effect.Level pressure difference VFC: the situation of turn-offing the user is issued to energy-conservation effect, but under the situation that outdoor environment temperature raises, can not reach energy-conservation effect.
Summary of the invention
Technical problem to be solved by this invention provides a kind of energy-conservation plate-type heat-exchange unit and control method thereof; Can be in real time according to user's thermic load or air-conditioning water yield demand; Decision hot water circuit output quantity and pump operation frequency, realize that outdoor environment temperature rising thermic load demand reduces or the user reduce, turn-off through throttle style can both be energy-conservation under the situation of air conditioner water supply effect.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of energy-conservation plate-type heat-exchange unit, comprises plate type heat exchanger and PLC controller, a termination primary side water pipe of said plate type heat exchanger, another termination secondary side water pipe; The heat transferring medium import department of said primary side water pipe is provided with temperature-sensing valve; The heat transferring medium exit of said secondary side water pipe is provided with first pressure sensor; Heat transferring medium import department is provided with the circulating pump and second pressure sensor; Wherein, The heat transferring medium exit of said secondary side water pipe also is provided with first temperature sensor, and heat transferring medium import department is provided with second temperature sensor; Two inputs of said PLC controller link to each other with first pressure sensor, second pressure sensor and receive pressure signal and calculate pressure reduction, in addition be connected with first temperature sensor, second temperature sensor shrinkage temperature signal and calculate the temperature difference of two inputs; An output links to each other with temperature-sensing valve and controls primary side heat transferring medium flow, and another output links to each other with circulating pump through frequency converter and controls secondary side heat transferring medium flow.
Above-mentioned energy-conservation plate-type heat-exchange unit, wherein, said primary side is a high temperature side, the heat transferring medium of said high temperature side is that temperature is 85 ℃～95 ℃ hot water or a steam; Said secondary side is a low temperature side, and the heat transferring medium of said low temperature side is that temperature is 50 ℃～70 ℃ a hot water.
Above-mentioned energy-conservation plate-type heat-exchange unit, wherein, said primary side is a low temperature side, the heat transferring medium of said low temperature side is that temperature is 7 ℃～12 ℃ a cold water; Said secondary side is a high temperature side, and the heat transferring medium of said high temperature side is that temperature is 20 ℃～25 ℃ a hot water.
The present invention solves the problems of the technologies described above the control method that a kind of above-mentioned energy-conservation plate-type heat-exchange unit also is provided; Wherein, Comprise the steps: a) to utilize first pressure sensor to gather outlet pressure P1; Utilize second pressure sensor to gather pressure of return water P2, calculate secondary side supply head signal P1-P2; B) when secondary side supply head signal during greater than pre-set threshold value, the PLC controller adopts the flow of level pressure difference control circulating pump to make pressure reduction fall in the pre-set threshold value P0; C) when secondary side supply head signal during smaller or equal to pre-set threshold value P0; Utilize first temperature sensor to gather leaving water temperature T1; Utilize second temperature sensor to gather return water temperature T2; Calculate secondary side water supply temperature signal T1-T2, the PLC controller adopts the flow of fixed difference difference control circulating pump to make the temperature difference fall in the pre-set threshold value.
The control method of above-mentioned energy-conservation plate-type heat-exchange unit, wherein, the pre-set threshold value P0 of said pressure difference signal is 5 bar.
The control method of above-mentioned energy-conservation plate-type heat-exchange unit, wherein, said primary side is a high temperature side, the heat transferring medium of said high temperature side is that temperature is 85 ℃～95 ℃ hot water or a steam; Said secondary side is a low temperature side; The heat transferring medium of said low temperature side is that temperature is 50 ℃～70 ℃ a hot water; It is definite value that the aperture of said PLC controller control and regulation valve is kept leaving water temperature T1, and it is that definite value realizes fixed difference difference control that the flow of control circulating pump is kept return water temperature T2.The control method of above-mentioned energy-conservation plate-type heat-exchange unit, wherein, as outlet pressure P1 greater than the highest outlet pressure Pmax or pressure of return water P2 less than minimum pressure of return water Pmin, heat exchange machine group alarm is shut down.
The control method of above-mentioned energy-conservation plate-type heat-exchange unit, wherein, when leaving water temperature T1 greater than maximum water temperature Tmax, heat exchange machine group alarm is also closed temperature-sensing valve; When return water temperature T2 less than minimum return water temperature Tmin, heat exchange machine group alarm.
The present invention contrasts prior art has following beneficial effect: energy-conservation plate-type heat-exchange unit provided by the invention and control method thereof; In conjunction with control of level pressure difference and fixed difference difference control; Real-time thermic load demand according to the user; Decision hot water circuit output quantity and pump operation frequency, thus reach that outdoor environment temperature rising thermic load demand reduces or the user reduce, turn-off through throttle style can both be energy-conservation under the situation of air conditioner water supply effect.Energy-conservation plate-type heat-exchange unit provided by the invention and control method thereof owing to can not neutralize the difference and the temperature difference with time control, therefore can not increase the complexity of control, can not influence the rapidity and the stability of control.In addition, the present invention realizes fixed difference difference through controlling leaving water temperature and return water temperature respectively, further simplifies control method, improves the reliability and stability of control.
Description of drawings
Fig. 1 is an energy-conservation plate-type heat-exchange set structure sketch map of the present invention;
Fig. 2 is an energy-conservation plate-type heat-exchange unit control flow sketch map of the present invention.
Among the figure:
1 plate type heat exchanger, 2 PLC controllers, 3 temperature-sensing valves
4 frequency converters, 5 circulating pumps, 6 first pressure sensors
7 second pressure sensors, 8 first temperature sensors, 9 second temperature sensors
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further description.
Fig. 1 is an energy-conservation plate-type heat-exchange set structure sketch map of the present invention.
See also Fig. 1, energy-conservation plate-type heat-exchange unit provided by the invention comprises plate type heat exchanger 1 and PLC controller 2, a termination high temperature side water pipe of said plate type heat exchanger 1, another termination low temperature side water pipe; The thermal medium import department of said high temperature side water pipe is provided with temperature-sensing valve 3; The cold media outlet place of said low temperature side water pipe is provided with first pressure sensor 6; Cold medium import department is provided with the circulating pump 5 and second pressure sensor 7; Wherein, the cold media outlet place of said low temperature side water pipe also is provided with first temperature sensor 8, and cold medium import department is provided with second temperature sensor 9; Two inputs of PLC controller 2 link to each other and receive pressure signal and calculate pressure reduction with first pressure sensor 6, second pressure sensor 7, in addition be connected with first temperature sensor 8, second temperature sensor 9 shrinkage temperature signal and calculate the temperature difference of two inputs; An output links to each other with control valve 3 and controls the thermal medium flow, and another output links to each other with circulating pump 5 through frequency converter 4 and controls cold rate-of flow.
Fig. 2 is an energy-conservation plate-type heat-exchange unit control flow sketch map of the present invention.
Please continue referring to Fig. 2, the control method of energy-conservation plate-type heat-exchange unit provided by the invention comprises the steps:
A) utilize first pressure sensor 6 to gather outlet pressure P1, utilize second pressure sensor 7 to gather pressure of return water P2, calculate low temperature side supply head signal P1-P2;
B) when low temperature side supply head signal during greater than pre-set threshold value, PLC controller 2 adopts the flow of pressure limiting differences control circulating pumps 5 to make pressure reduction fall in the pre-set threshold value P0;
C) when low temperature side supply head signal during smaller or equal to pre-set threshold value P0; Utilize first temperature sensor 8 to gather leaving water temperature T1; Utilize second temperature sensor 9 to gather return water temperature T2; Calculate low temperature side water supply temperature signal T1-T2, PLC controller 2 adopts the flow of fixed difference difference control circulating pump 5 to make the temperature difference fall in the pre-set threshold value.
Energy-conservation plate-type heat-exchange unit provided by the invention and control method thereof utilize the pressure reduction and the temperature difference to participate in control simultaneously.At first control is advanced backwater pressure reduction less than pre-set threshold value P0, pressure reduction less than the situation of setting value under control to advance backwater temperature difference be definite value, i.e. pressure limiting different constant temperature difference VFC.It is definite value that the aperture of PLC controller 2 control and regulation valves 3 of the present invention is kept leaving water temperature T1, and it is that definite value realizes fixed difference difference control that the flow of control circulating pump 5 is kept return water temperature T2.The essence of temperature difference control be exactly control leaving water temperature T1 respectively, return water temperature T2 is a definite value.Such as the scope of keeping leaving water temperature T1 respectively is 60 ℃～70 ℃; The scope of return water temperature T2 is 50 ℃～60 ℃; The present invention is that definite value realizes fixed difference difference through controlling leaving water temperature T1 and return water temperature T2 respectively, further simplifies control method, improves the reliability and stability of control.
For the sake of security, as outlet pressure P1 greater than the highest outlet pressure Pmax or pressure of return water P2 less than minimum pressure of return water Pmin, heat exchange machine group alarm is shut down; As leaving water temperature T1 during greater than maximum water temperature Tmax, heat exchange machine group alarm is also closed control valve 3, thereby reduces leaving water temperature T1 as early as possible.As return water temperature T2 during less than minimum return water temperature Tmin, heat exchange machine group alarm.
In order to improve the effect of level pressure difference and fixed difference difference control, first pressure sensor 6, second pressure sensor 7, first temperature sensor 8 and second temperature sensor 9 are as far as possible preferably near the user side setting, so that measure the variation of the pressure reduction temperature difference more accurately.
Be set at 10 ℃ with user's temperature difference below, it is example that pressure reduction P0 is set at 5 bar, and 1 clings to (bar)=0.1 MPa (MPa)=100 kPa (KPa)=1.0197 kg/cm, specifies the control procedure of the energy-conservation plate-type heat-exchange unit of the present invention.
The pressure limiting difference frequency conversion circulatory system: first pressure sensor 6, second pressure sensor 7, PLC controller 2, frequency converter 4 and circulating pump 5 form pressure limiting difference frequency conversion loop control loops.The system pressure sensor uninterruptedly sends signal to PLC controller 2 in real time, and PLC controller 2 supplies pressure of return water difference (P1-P2) to calculate automatically, and compares with settings; Be higher than going up in limited time of 5bar pressure reduction settings when calculating pressure difference; PLC sends analog control signal to frequency converter 4, and the frequency that frequency converter 4 will be controlled circulating pump 5 runnings reduces, so that circulating pump 5 rotating speeds slow down; Reduce pump head and flow, thereby pressure reduction is withdrawn into 5bar.Otherwise; Prescribe a time limit less than the following of 5bar pressure reduction settings when calculating pressure difference; Work is no longer participated in the pressure reduction instruction, and the PLC instruction should be carried out VFC alone by the fixed difference difference frequency conversion circulatory system in zone (between the 0-5bar flow-differential zone), pressed actual heating load to user delivering hot water and heat.When owing to terminal demand shift, cause pressure reduction to prescribe a time limit greater than going up of 5bar pressure reduction settings again, PLC sends analog control signals to frequency converter 4, once more circulating pump 5 rotating speeds is slowed down, and reduces pump head and flow, makes pressure reduction get back to 5bar.Here, the pressure limiting difference frequency conversion circulatory system is rapidly instant more to the reacting condition of pressure reduction pressure.Greater than the zone of the pressure reduction more than the 5bar, the fixed difference difference frequency conversion circulatory system is not participated in control.
The fixed difference difference frequency conversion circulatory system: said first temperature sensor 8, second temperature sensor 9, PLC controller 2, frequency converter 4 and circulating pump 5 form fixed difference difference frequency conversion loop control loops.The system temperature sensor uninterruptedly sends signal to PLC in real time, and PLC carries out supply and return water temperature difference (T1-T2) automatically and calculates, and compares with settings T0; Be higher than going up in limited time of 10 ℃ of temperature difference settings when calculating temperature approach, PLC sends analog control signal to frequency converter 4, and the frequency that frequency converter will be controlled circulating pump 5 runnings increases; So that circulating pump 5 faster rotational speed; Increase pump head and flow, strengthen heating load and improve return water temperature, thereby the temperature difference of making and settings T0 further.Otherwise; Prescribe a time limit less than the following of 10 ℃ of temperature difference settings when calculating temperature approach, PLC sends analog control signals to frequency converter 4, and the frequency that frequency converter will be controlled circulating pump 5 runnings reduces; So that circulating pump 5 rotating speeds slow down; Reduce pump head and flow, reduce heating load and reduce return water temperature, thereby the temperature difference of making and settings T0 further.
Press the computing formula Q=(Δ H/sL) of flow and pressure reduction
(1/2)Or Q=0.3116 (Δ H d
5.33/ L)
(1/2)/ n, wherein, Q is a flow; S is the pipeline resistivity, and Δ H is pipeline origin or beginning and terminal head difference; N is the inside pipe wall roughness; D is a bore; L is that the pipeline origin or beginning is to terminal length.For the water stream channel of confirming, the pressure reduction (pressure loss) that always certain flow is corresponding certain, under the situation that does not change channel cross-sectional flow area, flow is big more, and pressure reduction is just big more.Like the corresponding 25m of sole user 5bar pressure reduction
3The discharge of/h.When changing the circulation duct diameter is 1 half, 1) and like 25m
3/ h flow remains unchanged, and front and back pressure reduction will become and be far longer than 5bar (originally 40.22 times).2) constant like pressure reduction 5 bar, it is original 1/6.3 that discharge will be reduced to, and is about 3.97 m
3/ h.The frequency conversion of pressure limiting difference combines with the fixed difference difference variable frequency water supply, and heat supply water is not promptly supplied more than the planned quota guaranteeing exactly, guarantees that again maximum needs to change according to user's thermic load under the prerequisite of water load, implements the unsteady flow amount and supplies water as required.Promptly close and shine terminal temperature control, realized that again electric energy practices thrift to greatest extent.
Be example below with the vav terminal, like former thermic load working condition design as follows:
High temperature side (primary side)
Thermal source medium: water; Inlet temperature: 90 ℃; Outlet temperature: 70 ℃; Flow: 50 m
3/ h
Low temperature side (secondary side)
Air conditioner water medium: water; Inlet temperature: 50 ℃; Outlet temperature: 60 ℃; Flow: 100 m
3/ h
Pressure of supply water: 10 bar; Pressure of return water: 5 bar
Pump flow: 100 m3/h; Circulating pump lift: 6 bar; Circulating pump general power: 40 KW;
Pump operating cycle frequency: 50 HZ
Pressure falls: heat exchanger part and loine pressure are fallen: 1 bar;
(4 user's standard-sized sheets) falls in user side and loine pressure: 5 bar
When whole users do not reduce, seasonal variations, air temperature warming, when user's thermic load demand reduces by half,
1) as using constant temperature water supply, during the two robot control system(RCS) of level pressure difference frequency conversion circulation, the heat exchange state is following:
Heat: 500000 kcal/h (581.50 kw)
High temperature side (primary side)
Thermal source medium: water; Inlet temperature: 90 ℃; Outlet temperature: 70 ℃; Flow: 25 m
3/ h
Low temperature side (secondary side)
Air conditioner water medium: water; Inlet temperature: 55 ℃; Outlet temperature: 60 ℃; Flow: 100 m
3/ h
Pressure of supply water: 10 bar; Pressure of return water: 5 bar
Pump flow: 100 m
3/ h; Circulating pump lift: 6.0 bar; Circulating pump consumed power: 40 KW; Pump operating cycle frequency: 50 HZ
Pressure falls: heat exchanger part and loine pressure are fallen: 1.0 bar;
(4 user's standard-sized sheets) falls in user side and loine pressure: 5 bar
2) as using constant temperature water supply, during three robot control system(RCS)s that pressure limiting is poor, the fixed difference difference frequency conversion circulates, the heat exchange state is following:
Heat: 500000 kcal/h (581.50 kw)
High temperature side (primary side)
Thermal source medium: water; Inlet temperature: 90 ℃; Outlet temperature: 70 ℃; Flow: 25 m
3/ h
Low temperature side (secondary side)
Air conditioner water medium: water; Inlet temperature: 50 ℃; Outlet temperature: 60 ℃; Flow: 50 m
3/ h
Pressure of supply water: 6.25 bar; Pressure of return water: 5 bar
Pump flow: 50 m
3/ h; Circulating pump lift: 1.5 bar; Circulating pump consumed power: 5 KW;
Pump operating cycle frequency: 25 HZ
Pressure falls: heat exchanger part and loine pressure are fallen: 0.25 bar;
(4 user's standard-sized sheets) falls in user side and loine pressure: 1.25 bar.
Therefore, energy-conservation plate-type heat-exchange unit provided by the invention and control method thereof, promptly scheme 2) than existing scheme 1) in this circulating pump economize on electricity in season 87.5%.
Above-mentioned heat supply or the heat application of being exemplified as, energy-conservation plate-type heat-exchange unit provided by the invention and control method thereof also can be used for refrigeration, are low temperature side as long as set primary side, and secondary side is that high temperature side gets final product, and advances like 7 ℃ of water of 1 side, and 12 ℃ of water go out; 25 ℃ of water of secondary side advance, and 20 ℃ of water go out, and its heat transfer process is just in time opposite when heating, and the work basic principle is then identical, gives unnecessary details no longer one by one at this.
In sum; Energy-conservation plate-type heat-exchange unit provided by the invention and control method thereof; Can be applied to heat supply or refrigeration simultaneously, concrete advantage is following: 1. the power saving of high temperature (once) side heat supply: mate heat according to user's thermic load changes in demand through the aperture of automatic adjusting temperature-sensing valve in real time and supply with.2. the economize on electricity problem of circulating pump pressure limiting difference frequency conversion circulation.In real time according to user's the hot water demand that use, guarantee not excess water supply under hot water demand's the prerequisite, greatly saved electric energy.3. the economize on electricity problem of circulating pump fixed difference difference frequency conversion circulation.According to user's thermic load demand, decision hot water circuit output quantity and pump operation frequency have further been saved electric energy in real time.
Though the present invention discloses as above with preferred embodiments; Right its is not that any those skilled in the art are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing a little modification and perfect, so protection scope of the present invention is when being as the criterion with what claims defined.
Claims (8)
1. an energy-conservation plate-type heat-exchange unit comprises plate type heat exchanger (1) and PLC controller (2), a termination primary side water pipe of said plate type heat exchanger (1), another termination secondary side water pipe; The heat transferring medium import department of said primary side water pipe is provided with temperature-sensing valve (3); The heat transferring medium exit of said secondary side water pipe is provided with first pressure sensor (6); Heat transferring medium import department is provided with circulating pump (5) and second pressure sensor (7); It is characterized in that; The heat transferring medium exit of said secondary side water pipe also is provided with first temperature sensor (8), and heat transferring medium import department is provided with second temperature sensor (9); Two inputs of said PLC controller (2) link to each other with first pressure sensor (6), second pressure sensor (7) and receive pressure signal and calculate pressure reduction, in addition be connected with first temperature sensor (8), second temperature sensor (9) shrinkage temperature signal and calculate the temperature difference of two inputs; An output links to each other with temperature-sensing valve (3) and controls primary side heat transferring medium flow, and another output links to each other with circulating pump (5) through frequency converter (4) and controls secondary side heat transferring medium flow.
2. energy-conservation plate-type heat-exchange unit as claimed in claim 1 is characterized in that said primary side is a high temperature side, and the heat transferring medium of said high temperature side is that temperature is 85 ℃～95 ℃ hot water or a steam; Said secondary side is a low temperature side, and the heat transferring medium of said low temperature side is that temperature is 50 ℃～70 ℃ a hot water.
3. energy-conservation plate-type heat-exchange unit as claimed in claim 1 is characterized in that said primary side is a low temperature side, and the heat transferring medium of said low temperature side is that temperature is 7 ℃～12 ℃ a cold water; Said secondary side is a high temperature side, and the heat transferring medium of said high temperature side is that temperature is 20 ℃～25 ℃ a hot water.
4. the control method of an energy-conservation plate-type heat-exchange unit as claimed in claim 1 is characterized in that, comprises the steps:
A) utilize first pressure sensor (6) to gather outlet pressure P1, utilize second pressure sensor (7) to gather pressure of return water P2, calculate secondary side and supply backwater pressure difference signal P1-P2;
B) when secondary side supplies the backwater pressure difference signal greater than pre-set threshold value, PLC controller (2) adopts the flow of pressure limiting difference control circulating pump (5) to make pressure reduction fall in the pre-set threshold value P0;
C) when secondary side supply head signal during smaller or equal to pre-set threshold value P0; Utilize first temperature sensor (8) to gather leaving water temperature T1; Utilize second temperature sensor (9) to gather return water temperature T2; Calculate secondary side supply backwater temperature difference signal T1-T2, PLC controller (2) adopts the flow of fixed difference difference control circulating pump (5) to make the temperature difference fall in the pre-set threshold value.
5. the control method of energy-conservation plate-type heat-exchange unit as claimed in claim 4 is characterized in that, the pre-set threshold value P0 of said pressure difference signal is 5 bar.
6. the control method of energy-conservation plate-type heat-exchange unit as claimed in claim 4 is characterized in that, said primary side is a high temperature side, and the heat transferring medium of said high temperature side is that temperature is 85 ℃～95 ℃ hot water or a steam; Said secondary side is a low temperature side; The heat transferring medium of said low temperature side is that temperature is 50 ℃～70 ℃ a hot water; It is definite value that the aperture of said PLC controller (2) control and regulation valves (3) is kept leaving water temperature T1, and it is that definite value realizes fixed difference difference control that the flow of control circulating pump (5) is kept return water temperature T2.
7. like the control method of claim 5 or 6 described energy-conservation plate-type heat-exchange units, it is characterized in that, as outlet pressure P1 greater than the highest outlet pressure Pmax or pressure of return water P2 less than minimum pressure of return water Pmin, heat exchange machine group alarm is shut down.
8. like the control method of claim 5 or 6 described energy-conservation plate-type heat-exchange units, it is characterized in that, when leaving water temperature T1 greater than maximum water temperature Tmax, heat exchange machine group alarm is also closed temperature-sensing valve (3); When return water temperature T2 less than minimum return water temperature Tmin, heat exchange machine group alarm.
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| CN2012101382343A CN102661672A (en) | 2012-05-07 | 2012-05-07 | Energy-saving plate heat exchanger unit and control method thereof |
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| CN2012101382343A CN102661672A (en) | 2012-05-07 | 2012-05-07 | Energy-saving plate heat exchanger unit and control method thereof |
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| CN104132580A (en) * | 2014-08-18 | 2014-11-05 | 广东汇嵘节能服务有限公司 | Intelligent heat conduction steam-water heat exchange dynamic temperature control method and dynamic temperature control system |
| CN104964358A (en) * | 2015-06-15 | 2015-10-07 | 上海意利法暖通科技有限公司 | Heat exchange device of capillary tube system |
| CN106168404A (en) * | 2016-07-13 | 2016-11-30 | 昆山台佳机电有限公司 | The secondary pump air-conditioner water system flow-changing control method of temperature difference correction and device |
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| CN102927622B (en) * | 2012-11-28 | 2015-04-01 | 北京天一众合环境工程有限公司 | Heat supply regulating device |
| CN104132580A (en) * | 2014-08-18 | 2014-11-05 | 广东汇嵘节能服务有限公司 | Intelligent heat conduction steam-water heat exchange dynamic temperature control method and dynamic temperature control system |
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| CN109737485A (en) * | 2018-12-15 | 2019-05-10 | 阿诗丹顿燃具有限公司 | Gas water heater heating system and control device and method thereof |
| CN109520333A (en) * | 2018-12-28 | 2019-03-26 | 启明星宇节能科技股份有限公司 | Flue gas waste heat recovery heat-exchange system |
| CN109813135A (en) * | 2018-12-28 | 2019-05-28 | 浙江敏泰科技有限公司 | A kind of oxidative steam heat-exchange system |
| CN111551054B (en) * | 2019-02-12 | 2022-01-14 | 宝山钢铁股份有限公司 | Temperature control method of BMD (BMD) filtering circulating water based on plate heat exchanger |
| CN111551054A (en) * | 2019-02-12 | 2020-08-18 | 宝山钢铁股份有限公司 | Temperature control method of BMD (BMD) filtering circulating water based on plate heat exchanger |
| WO2020238413A1 (en) * | 2019-05-27 | 2020-12-03 | 广东美的暖通设备有限公司 | Central air conditioner, air conditioner water system, control method therefor, and control device thereof |
| EP3913295A4 (en) * | 2019-05-27 | 2022-03-16 | Shanghai Meicon Intelligent Construction Co., Ltd. | Central air conditioner, air conditioner water system, control method therefor, and control device thereof |
| US11835248B2 (en) | 2019-05-27 | 2023-12-05 | Shanghai Meicon Intelligent Construction Co., Ltd. | Central air conditioner, air conditioner water system, control method therefor, and control device thereof |
| CN111256503A (en) * | 2020-01-19 | 2020-06-09 | 上海柯垓冷却技术有限公司 | Heat exchange system and heat exchange control method |
| CN112144069A (en) * | 2020-09-25 | 2020-12-29 | 阳光电源股份有限公司 | Spray coating device and temperature adjusting method for spray coating device |
| CN113390661A (en) * | 2021-06-08 | 2021-09-14 | 西安交通大学 | Energy efficiency testing and evaluating method for plate type heat exchanger unit for heat supply |
| CN114166537A (en) * | 2021-11-09 | 2022-03-11 | Omexell(济南)传热技术有限公司 | Heat exchanger unit and detection method thereof |
| CN114353289A (en) * | 2021-12-21 | 2022-04-15 | 山东省煤田地质局第四勘探队 | Rock-soil heat exchanger circulating water pump control device and control method |
| CN115406167A (en) * | 2022-09-06 | 2022-11-29 | 山东钢铁集团日照有限公司 | Control method for improving industrial circulating water efficiency |
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