CN101211169B - Minimum conveying energy consumption heat supply regulating method - Google Patents
Minimum conveying energy consumption heat supply regulating method Download PDFInfo
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- CN101211169B CN101211169B CN2007101448922A CN200710144892A CN101211169B CN 101211169 B CN101211169 B CN 101211169B CN 2007101448922 A CN2007101448922 A CN 2007101448922A CN 200710144892 A CN200710144892 A CN 200710144892A CN 101211169 B CN101211169 B CN 101211169B
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Abstract
The invention relates to a control method for heat supply of a heat source, in particular to a control method for the heat supply of the heat source with minimum transport energy consumption, which aims at solving the problems that the existing heat source heat supply transport has large energy consumption, the working status of valves adjusted by users is hardly to be known during heat source heat supply, and the out-of-control of the flow rate is easy to occur in the least favor of the users during variable flow control. The method comprises the following steps: determining the flow rate and the head of a heat source circulating pump under the designed conditions of a heat supply network based on the designed parameters at the early stage of heat supply, and determining the flow rate for each user and the valve opening regulated by each user according to the flow rate; controlling the rotation speed of the circulating pump to the high-efficiency loading zone of a pump via the heat source circulating pump according to the required flow rate of the heat network; and reducing the flow rate by 10%, repeating the steps until the flow rate after reduction is less than the minimum flow rate of the heat network, and stopping the reduction. When the system is operated under the circumstances of large temperature difference and small flow rate, the minimum flow rate is normally 40%, and the average annual operating load is 60% of the rated load of the water circulating pump. By adopting variable flow-rate operation, the electricity saving rate of the invention is 66.67%.
Description
Technical field
The present invention relates to a kind of heat supply regulating method.
Background technology
Existing its conveying energy consumption of heat supply is bigger, has caused the waste of the energy, and this waste accounts for the large percentage that the heating bag burns expense; Another is exactly in the heat supply process, is difficult to know the working condition of user's control valve, and the unsteady flow amount causes least favorable user's flow imbalance easily when regulating.
Summary of the invention
The objective of the invention is for solving existing its conveying energy consumption of heat supply greatlyyer, caused the waste of the energy, this waste accounts for the large percentage that the heating bag burns expense; Another is exactly in the heat supply process, is difficult to know the working condition of user's control valve, and the unsteady flow amount causes the problem of least favorable customer flow imbalance easily when regulating, and a kind of heat supply regulating method of minimum conveying energy consumption is provided.Technical scheme of the present invention realizes by following steps: resistance of pipe system coefficient identification when, just moving: 1, at the heat supply initial stage, according to system design parameters, determine maximum flow, the minimum flow of heat supply network, and by design discharge and lift operation heat supply network frequency conversion ebullator; 2, each user is by the aperture of the required flow control valve under the design conditions; 3, adjusting frequency conversion ebullator rotating speed is operated in the efficient loading zone it; Whether 4, detect the heat supply network flow and stablize, not, then repeat the 2nd, 3 steps, be then to carry out next step; 5, measure confession, backwater pressure differential deltap P
i, heat supply network circular flow G
iAgain according to formula:
Calculate the resistance coefficient S of pipe network
i6, each user's controlling opening of valve remains unchanged; 7, reduce the setting value of ebullator rotating speed then according to 10% ratio; 8, ebullator is according to the set point adjustment rotating speed; Whether 9, detect the heat supply network flow and stablize, not, then repeat the 8th step, be then to carry out next step; 10, detecting the heat supply network flow and whether arrive minimum flow, not, then repeat the 5th, 6,7,8,9 steps, is then to carry out next step; 11, according to the data of each measurements and calculations, arrangement obtains Δ P
i, S
i, G
iRelation and record, use when regulating.Two, the best resistance coefficient control in when operation: 12, formally bring into operation or flow when transfiniting at heat supply network, the heating demand of forecast heat supply network promptly forecasts supply water temperature, water supply flow; 13, thermal source is determined the initial speed of frequency conversion ebullator according to the supply water temperature operation of forecast by the water supply flow of forecast; 14, each user is according to the required hot water flow automatic regulating valve door under the operating condition, and regulated quantity is the hot water flow that enters into each user; Whether transfinite, be if 15, detecting the heat supply network flow, then repeat the 12nd, 13,14 steps, not, then carries out next step; 16, according to the heat supply network circular flow G that measures
j, according to the Δ P of record
i, S
i, G
iCalculate Δ P
i, S
j17, with the Δ P that obtains
jThe confession, the backwater pressure differential resetting value that are decided to be pumps for hot water supply net; 18, ebullator is regulated rotating speed by this pressure reduction, calculates resistance coefficient S behind the heat supply network stability of flow again; Whether 19, detect resistance coefficient S is S
jOr near S
j, be, then forward the 21st step to, not, then carry out next step, as resistance coefficient S and S
jDifference less than S
jpromptly thought in 5% o'clock near S
j20, revise Δ P again
j, reset the ebullator rotating speed, go to the 18th step again; 21, measuring system cycle detection heat supply network circular flow G all the time
j22, detect heat supply network circular flow G
jWhether bigger variation takes place, be, then go to the 15th step, repeat, not, then go to the 21st step, when changing value surpasses heat supply network circular flow G
j5% o'clock, be considered as taking place bigger variation.
Characteristics of the present invention are: thermal source for the heating load formula that the user provides is: Q=G ρ c (T
G-T
H) (1), wherein: Q---heat supply amount, W; G---heat supply hot water flow, m
3/ s; C---hot water specific heat at constant pressure, J/ (kgK); T
G---the thermal source supply water temperature, ℃; T
H---the thermal source return water temperature, ℃.
Constant when the physical parameter of water pump conveyance fluid, when the density similarity coefficient was also constant, the power of water pump consumption was directly proportional with the cube of rotating speed, promptly be directly proportional with the cube of flow as shown in the formula:
(2), p in the formula, n, G represent power, rotating speed and the flow of water circulating pump respectively.
Obviously find out the heat that conveying is same by (1) and (2) formula, increasing supplies, backwater temperature difference, and the heat supply transportation scheme that reduces water supply flow is the most energy-conservation.But cause hydraulic misadjustment when adopting the big temperature difference, low discharge heat supply especially easily.Especially in the flow regulation process, do not grasp the situation at user place, do not know whether can produce the phenomenon of hydraulic misadjustment, thus unsteady flow amount operating mode difficulty be adjusted to the most energy-conservation operating mode.
Major advantage of the present invention is:
During the constant flow operation:
The water circulating pump choice of capacity is to determine after adding certain surplus according to its peak load in conventional design, and when lectotype selection, be difficult to again choose and the on all four water pump of design parameter, therefore the actual installation capacity of water pump is often bigger than normal, and the rated load of general ebullator only accounts for 60%～80% of place capacity.
When water circulating pump moved according to the constant flow operating mode, the actual motion flow was 60%～80% of water pump rated flow.
During the operation of unsteady flow amount:
System adopts when having a narrow range of temperature the flow operation greatly, and flow can be regulated between minimum flow and maximum flow, and minimum flow generally is decided to be 40% (calculating by conservative value).Then year the fluctuations in discharge scope of operation the ebullator rated load 40%～80% between, the mean value of year operating load is 60% of water circulating pump rated load.
Energy saving calculation:
Power saving rate calculates according to the computing formula that the mandatory national standard of GB12497 " threephase asynchronous economical operation " is implemented in the supervision guide:
In the formula: K
iPower saving rate, Δ P
IEconomize on electricity power, P
LThe power input of pump motor under the rated load, P
eThe rated power of pump motor label,
Water pump year operation average discharge, Q
NWater pump year operation rated flow.Can get fractional energy savings is:
Obvious its energy-saving effect highly significant, power saving rate can reach 66.67%.
The expense of circulation pump of heat-supply network power consumption is very considerable in heating system, calculates with the example of certain Thermal Corp.The total area of heat-supply service in concentrated supply of heating in the city sub-district, northeast is 1278 (ten thousand m
2), system is the constant flow operation, total operation flow of physical record is 15267 (m
3/ h).Move 4 water pumps, the lift of water pump is that 65 (m), flow are 3846 (m
3/ h), motor rated power is 800 (kW).Motor is selected the 10kV power voltage supply, and electricity price is according to 0.76 yuan/kWh of high pressure user electricity price, and heating time calculated according to 180 days, and the year electricity charge that the constant flow operation needs are:
0.76 * 4 * 800 * 180 * 24=1050.6240 (ten thousand yuan)
Because the flow that calculates and the flow of actual needs are very approaching, so the input power of motor is according to motor famous brand power calculation.
If adopt unsteady flow amount operation back power saving rate to calculate according to 66.67%, then the electricity charge of Jie Yueing are:
0.76 * 4 * 800 * 180 * 24 * 0.6667=700.4510 (ten thousand yuan)
Obviously its reduction effect is very significant.
Technical advance of the present invention: the present invention is the process identification technology and the combining of heat supply network regulation technology, and can give full play to the advantage of computer intelligence control, effectively utilizes a large amount of measurement data of monitoring system, realizes the Energy Saving Control of therrmodynamic system.
Description of drawings
The process flow diagram of the resistance of pipe system coefficient discrimination method when Fig. 1 is operation just, the process flow diagram of the best resistance coefficient control method when Fig. 2 is operation, Fig. 3 is water circulating pump and heat-net-pipeline drag characteristic graph of relation, and Fig. 4 is the adjusting synoptic diagram the when user uses electric control valve in the embodiment two.Reference numeral 1-4 among Fig. 4 is the circling water flow rate sensor, and 2-4 is the circulating-pump outlet pressure transducer, and 2-5 is a heat supply network pressure of supply water sensor, 2-6 is a heat supply network pressure of return water sensor, 5-1 is a heat supply network supply water temperature sensor, and 5-2 is a heat supply network return water temperature sensor, and 5-3 is an outdoor temperature sensor; 6-1,6-2 and 6-3 are respectively the adjustable speed ebullators, 7-1 is system controller (is responsible for identification system resistance coefficient, forecast heating demand, regulates the ebullator rotating speed), 8-1,8-and 8-3 are respectively heating boilers, 8-4,8-6 are respectively the boiler inlet tube and outlet tubes, 8-5,8-7 are respectively that heat supply network supplies, return pipe, and 9-1 is hot user.
Embodiment
Embodiment one: (referring to Fig. 1～Fig. 3) technical scheme of present embodiment realizes by following steps: resistance of pipe system coefficient identification when, just moving: 1, at the heat supply initial stage, according to system design parameters, determine maximum flow, the minimum flow of heat supply network, and by design discharge and lift operation heat supply network frequency conversion ebullator.2, each user (thermal substation etc.) is also according to design parameter, determines flow separately, and according to the aperture of this flow control valve.3, pumps for hot water supply net will transfer to the rotating speed of ebullator in the efficient loading zone (as 3-1 among Fig. 3 and following interval) of water pump according to the required flow of heat supply network.Whether 4, detect the heat supply network flow and stablize, not, then repeat the 2nd, 3 steps, be then to carry out next step.5, behind the heat supply network stability of flow, measurement supplies, backwater pressure differential deltap P
i(as the point of the 2-2 among Fig. 3), heat supply network circular flow G
i(as the point of the 1-2 among Fig. 3), again according to formula:
Calculate the resistance coefficient S of pipe network
i(as the point of the 3-3 among Fig. 3).6, each user's valve opening remains unchanged.7 and then the pump flow setting value reduced by 10%.8, ebullator is according to the set point adjustment rotating speed.Whether 9, detect the heat supply network flow and stablize, not, then repeat the 8th step, be then to carry out next step.10, detecting the heat supply network flow and whether arrive minimum flow, not, then repeat the 5th, 6,7,8,9 steps, is then to carry out next step; By that analogy until the flow that reduces less than the minimum flow of heat supply network (as the point of the 1-3 among Fig. 3, minimum flow determines according to the efficient district of the required minimum differntial pressure of pipe network, the required minimum flow of thermal source and water circulating pump, take all factors into consideration generally be decided to be rated flow 40%) till the back.11, this moment is according to the data of each measurements and calculations.Arrangement obtains Δ P
i, S
i, G
iRelation and in computing machine record, use when regulating.Said process as shown in Figure 1.Two, the best resistance coefficient control in when operation: 12, formally bring into operation or flow when transfiniting at heat supply network, the heating demand of forecast heat supply network promptly forecasts supply water temperature, water supply flow.13, thermal source should be according to supply water temperature (as the thermal source conditions permit preferably according to the highest supply water temperature) operation of forecast, and pumps for hot water supply net moves according to the water supply flow of forecast.14, each user this moment (thermal substation) automatically adjusts according to own needed hot water flow, and regulated quantity is the hot water flow that enters into each user (thermal substation).Whether 15, detect the heat supply network flow transfinites and (transfinites and be defined as: be lower than minimum flow and be the 3-4 point among Fig. 3, or be 3-2 point among Fig. 3 greater than maximum flow.), be, then repeat the 12nd, 13 and 14 steps, not, then carry out next step.16, can measure the circular flow (this flow may be inconsistent with the flow of forecast) of heat supply network after each user regulates and stablizes, according to the heat supply network circular flow G that measures
j, according to the Δ P of record
i, S
i, G
iCalculate Δ P
j, S
j17, with the Δ P that obtains
jThe confession, the backwater pressure differential resetting value that are decided to be pumps for hot water supply net.18, ebullator is regulated rotating speed by this pressure differential resetting value, calculates resistance coefficient S behind the heat supply network stability of flow again.Whether 19, detect resistance coefficient S is S
jOr near S
j(tentatively assert S and S
jDifference promptly think less than 5% near S
j), be, then forward the 21st step to, not, then carry out next step (this adjustment process is difficult for too fast, wait for that each user's adjustment process finishes).20, revise Δ P again
j, reset the ebullator rotating speed, go to the 18th step again.Regulate near the drag characteristic all the time curve in Fig. 33 can guarantee pipeline through the method, both guaranteed resistance coefficient the best of system, the conveying energy consumption of heat supply network is minimum.21, measuring system detects heat supply network circular flow G all the time
j22, detect heat supply network circular flow G
jWhether bigger variation takes place, and (this changing value can determine that initial value is decided to be G according to actual conditions
j5%), be, then go to the 15th step, repeat again, not, then do not go to the 21st step.Said process as shown in Figure 2.
Embodiment two: (referring to Fig. 4) present embodiment is that the boiler room heat supply is regulated by supply water temperature, and the user uses electronic two-way valve to regulate heat supply network effluent amount, thus the embodiment when regulating customer charge.Before system regulates, carry out the identification of SR coefficient earlier.(phase one of embodiment one).The identification of the best resistance coefficient in operational process and control procedure (subordinate phase of embodiment one).Thermal source and hot user's adjustment process is as described below in operational process:
Hot user 9-1 by the aperture that controller 9-4 regulates automatic regulating valve door 9-2, realizes the independent regulation of user according to heat requirement according to the measurement temperature of thermal detector 9-3.Other users' adjustment process is similar with it.The first heating boiler 8-1, the second heating boiler 8-2 and the 3rd heating boiler 8-3 are according to the measurement temperature of the first thermal detector 8-1-1, the second thermal detector 8-2-1 and the 3rd thermal detector 8-3-1, regulate the supply water temperature of the first heating boiler 8-1, the second heating boiler 8-2 and the 3rd heating boiler 8-3 by the first boiler controller 8-1-2, the second boiler controller 8-2-2 and the 3rd boiler controller 8-3-2, realize the independent regulation (the platform number of operation boiler by boiler dispatching system decision, not this patent scope within) of thermal source according to feedback quantity.Resistance of pipe system coefficient identification when system controller 7-1 is responsible for system and just moves, the best resistance coefficient control during operation and the work such as Load Forecasting of system.Described all algorithms of present embodiment all realize that by system controller 7-1 system controller 7-1 can be made of industrial control computer or nonshared control unit with adjusting.To have communication contact between the system controller 7-1 and the first boiler controller 8-1-2, the second boiler controller 8-2-2 and the 3rd boiler controller 8-3-2, the supply water temperature setting value of system controller 7-1 forecast will be composed in each forecast back and be worth for the first boiler controller 8-1-2, the second boiler controller 8-2-2 and the 3rd boiler controller 8-3-2 accordingly, to guarantee that the entire system range of adjustment is the best.The flow setting value of the water circulating pump that system controller 7-1 is calculated can be composed the frequency-variable controller of water supply pump motor, also the flow setting value of water circulating pump can be converted to the frequency converter that the electric machine frequency setting value is directly composed water supply pump motor.
Claims (1)
1. the heat supply regulating method of a minimum conveying energy consumption, the heat supply regulating method that it is characterized in that minimum conveying energy consumption is realized by following steps: resistance of pipe system coefficient identification when, just moving: (1), at the heat supply initial stage, according to system design parameters, determine maximum flow, the minimum flow of heat supply network, and by design discharge and lift operation heat supply network frequency conversion ebullator; (2), each user is by the aperture of the required flow control valve under the design conditions; (3), adjusting frequency conversion ebullator rotating speed is operated in the efficient loading zone it; (4), whether stable, not, then repeat (2), (3) step if detecting the heat supply network flow, be then to carry out next step; (5), measure confession, backwater pressure differential deltap P
i, heat supply network circular flow G
iAgain according to formula:
Calculate the resistance coefficient S of pipe network
i(6), each user's controlling opening of valve remains unchanged; (7), reduce the setting value of ebullator rotating speed then according to 10% ratio; (8), ebullator is according to the set point adjustment rotating speed; (9), whether stable, not, then repeat (8) step if detecting the heat supply network flow, be then to carry out next step; (10), detect the heat supply network flow and whether arrive minimum flow, deny, then repeat (5), (6), (7), (8), (9) step, be then to carry out next step; (11), according to the data of each measurements and calculations, arrangement obtains Δ P
i, S
i, G
iRelation and record, use when regulating; Two, the best resistance coefficient control in when operation: (12), formally bring into operation or flow when transfiniting at heat supply network, the heating demand of forecast heat supply network promptly forecasts supply water temperature, water supply flow; (13), thermal source is according to the supply water temperature operation of forecast, determines the initial speed of frequency conversion ebullator by the water supply flow of forecast; (14), each user is according to the required hot water flow automatic regulating valve door under the operating condition, regulated quantity is the hot water flow that enters into each user; (15), detect the heat supply network flow and whether transfinite, be, then repeat (12), (13), (14) step, not, then carry out next step; (16), according to the heat supply network circular flow G that measures
j, according to the Δ P of record
i, S
i, G
iCalculate Δ P
j, S
j(17), with the Δ P that obtains
jThe confession, the backwater pressure differential resetting value that are decided to be pumps for hot water supply net; (18), ebullator regulates rotating speed by this pressure reduction, calculates resistance coefficient S behind the heat supply network stability of flow again; Whether (19), detect resistance coefficient S is S
jOr near S
j, be, then forward (21) step to, not, then carry out next step, as resistance coefficient S and S
jDifference less than S
jpromptly thought in 5% o'clock near S
j(20), revise Δ P again
j, reset the ebullator rotating speed, go to (18) step again; (21), measuring system cycle detection heat supply network circular flow G all the time
j(22), detect heat supply network circular flow G
jWhether bigger variation takes place, be, then go to (15) step, repeat, not, then go to (21) step, when changing value surpasses heat supply network circular flow G
j5% o'clock, be considered as taking place bigger variation.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101448922A CN101211169B (en) | 2007-12-21 | 2007-12-21 | Minimum conveying energy consumption heat supply regulating method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101448922A CN101211169B (en) | 2007-12-21 | 2007-12-21 | Minimum conveying energy consumption heat supply regulating method |
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|---|---|
| CN101211169A CN101211169A (en) | 2008-07-02 |
| CN101211169B true CN101211169B (en) | 2010-12-01 |
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ID=39611246
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|---|---|---|---|
| CN2007101448922A Expired - Fee Related CN101211169B (en) | 2007-12-21 | 2007-12-21 | Minimum conveying energy consumption heat supply regulating method |
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| CN (1) | CN101211169B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094798A (en) * | 2010-12-22 | 2011-06-15 | 哈尔滨工业大学 | Variable flow adjusting method for heat supply network circulating pump in equal resistance interval |
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| CN102147300A (en) * | 2010-12-24 | 2011-08-10 | 宁波水表股份有限公司 | Heat meter terminal providing multiple sensing signals |
| CN102261691B (en) * | 2011-05-23 | 2013-05-08 | 河南理工大学 | Power transmission system of multi-heat source loop pipe network, system configuration method and operation mode |
| WO2014075303A1 (en) * | 2012-11-16 | 2014-05-22 | 格兰富控股联合股份公司 | Thermal equilibrium set and control method and control apparatus thereof |
| CN103605837B (en) * | 2013-11-04 | 2016-08-17 | 河南理工大学 | Multi-heat source looping network accessibility analyzes decision method and ameliorative way thereof |
| CN104848412B (en) * | 2015-05-06 | 2017-10-31 | 北京建筑大学 | A kind of method for reducing regional heating heat supply network transmission ＆ distribution energy consumption |
| CN105757758A (en) * | 2016-04-08 | 2016-07-13 | 华电电力科学研究院 | Thermal power plant heat network energy saving system and method |
| CN108800303B (en) * | 2018-06-28 | 2020-07-07 | 长安大学 | Refined energy-saving heat supply method based on pattern recognition |
| DE102019004317A1 (en) * | 2019-06-19 | 2020-12-24 | KSB SE & Co. KGaA | Method for controlling a circulating pump and a circulating pump |
| CN112484128A (en) * | 2020-11-26 | 2021-03-12 | 华能聊城热电有限公司 | Heat exchange station water pump adaptation method |
| CN113158476B (en) * | 2021-04-27 | 2023-06-09 | 唐山晓世科技有限公司 | Computer method for adjusting hydraulic balance of heat supply pipe network |
| CN114440299B (en) * | 2022-03-10 | 2023-05-09 | 浙江广涛卫厨有限公司 | Multi-energy-source combined reversing valve control mode |
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| CN2115431U (en) * | 1991-12-11 | 1992-09-09 | 富阳电动仪表厂 | Choke length change type regulating valve |
| CN2423462Y (en) * | 2000-01-19 | 2001-03-14 | 孟繁军 | Automatic control valve for flow |
| CN2465108Y (en) * | 2001-02-25 | 2001-12-12 | 殷占民 | Straight flow type multi-function heating regulator |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2115431U (en) * | 1991-12-11 | 1992-09-09 | 富阳电动仪表厂 | Choke length change type regulating valve |
| CN2423462Y (en) * | 2000-01-19 | 2001-03-14 | 孟繁军 | Automatic control valve for flow |
| CN2465108Y (en) * | 2001-02-25 | 2001-12-12 | 殷占民 | Straight flow type multi-function heating regulator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094798A (en) * | 2010-12-22 | 2011-06-15 | 哈尔滨工业大学 | Variable flow adjusting method for heat supply network circulating pump in equal resistance interval |
| CN102094798B (en) * | 2010-12-22 | 2013-08-21 | 哈尔滨工业大学 | Variable flow adjusting method for heat supply network circulating pump in equal resistance interval |
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| CN101211169A (en) | 2008-07-02 |
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