CN108916984B - Control system for solving hydraulic imbalance of heat supply system - Google Patents
Control system for solving hydraulic imbalance of heat supply system Download PDFInfo
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- CN108916984B CN108916984B CN201810826854.3A CN201810826854A CN108916984B CN 108916984 B CN108916984 B CN 108916984B CN 201810826854 A CN201810826854 A CN 201810826854A CN 108916984 B CN108916984 B CN 108916984B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
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Abstract
The invention discloses a control system for solving hydraulic imbalance of a heat supply system, which comprises a heat supply pipe network for supplying heat to users, wherein a valve is arranged in the heat supply pipe network and is controlled by a valve manager, the valve manager is connected with a parameter calculator, the parameter calculator is connected with a numbering device, and the numbering device carries out serial numbering. The parameter calculator is also connected with an outdoor temperature collector, and the outdoor temperature collector collects outdoor temperature. The heat supply pipe network comprises a heat supply main pipeline which is communicated with a user heat supply branch where users are located. The invention considers the influence of the heating distance on the users, not only fundamentally eliminates the horizontal heating power imbalance of the heating system, and leads the near-end and far-end users to achieve the same heating effect, but also improves the regulation characteristic of a pipe network, avoids the increase of the operation energy consumption caused by a large-flow operation mode, and does not need to increase the pipe diameter of a main heating pipeline.
Description
Technical Field
The invention belongs to the field of heating regulation control, and particularly relates to a control system for solving hydraulic imbalance of a heating system.
Background
The user room temperature is related to various factors, such as outdoor air temperature, pipe network flow, heating and water supply temperature, building heat consumption and the like. When the heat load of a user changes, the flow rate, the water supply temperature and the like of a heat supply system need to be adjusted to realize heat supply according to needs. The purpose of heating regulation is to adapt the heat dissipation capacity of the heat dissipation equipment of a heating user to the change rule of the heat load of the user so as to prevent the heating user from generating overhigh or overlow room temperature.
However, no matter which kind of heat supply adjustment method is adopted at present, the near-end user can firstly realize heat supply adjustment, and the far-end user can start to realize heat supply adjustment after a period of time, so that the flow distribution is unbalanced due to the influence of heat supply distance, and further the heat supply effect of the far-end user is inferior to that of the near-end user in the same heat supply adjustment time period, and even more serious heat imbalance phenomenon occurs.
Hydraulic disorders are the source of thermal disorders. At present, aiming at the imbalance of water power and heat power of a heat supply network, a large-flow operation mode is usually adopted in China. The high-flow operation mode does not fundamentally eliminate the horizontal thermal imbalance of the heating system, but increases the flow of the water pump, so that the operation energy consumption is increased, and the adjustment performance of the heating system is deteriorated. In addition, the pipe diameter of the main line of the heat supply network needs to be increased when the circulation flow is increased.
Disclosure of Invention
The invention is provided for solving the problems in the prior art, and aims to provide a control system for solving the hydraulic imbalance of a heating system.
The technical scheme of the invention is as follows: the control system comprises a heat supply pipe network for supplying heat to users, wherein valves are arranged in the heat supply pipe network and controlled by valve managers, the valve managers are connected with parameter calculators, the parameter calculators are connected with numbering devices, and the numbering devices are numbered sequentially.
The parameter calculator is also connected with an outdoor temperature collector, and the outdoor temperature collector collects outdoor temperature.
The heat supply pipe network comprises a heat supply main pipeline which is communicated with a user heat supply branch where users are located.
And a circulating water pump is arranged in the heat supply main pipeline, and the user heat supply branches are provided with valves.
And a control branch communicated with the valve circuit is arranged at the control end of the valve manager.
And the numbering devices are used for arranging the control branches in an ascending order from near to far according to the distance from the heat supply.
User-requested thermal load Q1，Q2，……，QnThe following formula is satisfied:
in the formula: qiUser i at outdoor temperature TwThermal load of, W;
Qi' -heating design heat load of user i, W;
Tn-calculating the temperature, deg.C, in the heating room;
Tw' -calculating the temperature, DEG C, outside the heating room;
Tw-outdoor temperature, ° c;
qA-heat index of building heating area, W/(m)2)；
Ai-heating area of user i, m2。
The control system adopts quality adjustment or quantity adjustment to determine the flow G required by the heat supply of the user i when the outdoor temperature changesiThe value of (c):
when the system employs mass regulation:
when the system employs volume adjustment:
when the system employs quality regulation that changes the flow in stages: g ═ C, G'
In the formula: gi-traffic of user i, m3/s；
Tg-water temperature of the water supply;
Th-temperature of the backwater.
The operation flow of the user far away from the heat supply point needs to meet the minimum operation flow of the system, and in order to ensure that the user started first obtains the same heat supply effect, the flow of the user relatively close to the user is reduced proportionally, the calculation method is as follows,
in the formula:
when heating is started, the flow rates of the user k, the user k +1, the user … …, the user n-1 and the user n respectively flow into the heat exchanger.
The valve manager controls opening and closing and opening degrees of valves in the user heat supply branches to control system operation flow to be larger than the minimum system operation flow, and under the principle that flow preferentially flows into remote users, the heat supply effects of n users before next operation adjustment are guaranteed to be consistent.
The invention considers the influence of the heating distance on the users, not only fundamentally eliminates the horizontal heating power imbalance of the heating system, and leads the near-end and far-end users to achieve the same heating effect, but also improves the regulation characteristic of a pipe network, avoids the increase of the operation energy consumption caused by a large-flow operation mode, and does not need to increase the pipe diameter of a main heating pipeline.
Drawings
FIG. 1 is a schematic diagram of the connection of the control system of the present invention;
FIG. 2 is a schematic view of the connection of a heat supply network according to the present invention;
FIG. 3 is a control flow chart of the control system of the present invention;
wherein:
1 numbering device and 2 parameter calculator
3 valve manager 4 outdoor temperature collector
5 heat supply pipe network
31 control branch 51 heat supply main pipeline
52 user heat supply branch 53 circulating water pump
54 valve.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in fig. 1 to 3, a control system for solving hydraulic imbalance of a heat supply system comprises a heat supply pipe network 5 for supplying heat to users, wherein a valve 54 is arranged in the heat supply pipe network 5, the valve 54 is controlled by a valve manager 3, the valve manager 3 is connected with a parameter calculator 2, the parameter calculator 2 is connected with a numbering device 1, and the numbering device 1 performs sequential numbering.
The parameter calculator 2 is also connected with an outdoor temperature collector 4, and the outdoor temperature collector 4 collects outdoor temperature.
The heat supply pipe network 5 comprises a main heat supply pipeline 51, and the main heat supply pipeline 51 is communicated with a user heat supply branch 52 where users are located.
A circulating water pump 53 is arranged in the main heating pipeline 51, and valves 54 are arranged in the user heating branches 52.
The control side of the valve manager 3 is provided with a control branch 31 in circuit communication with a valve 54.
The numbering device 1 arranges the control branches 31 in an ascending order from the near to the far direction of the heating.
The numbering device 1, the parameter calculator 2, the valve manager 3 and the outdoor temperature collector 4 are commercially available electric devices.
The parameter calculator 2 is an open source programmable parameter program calculator.
User-requested thermal load Q1，Q2，……，QnThe following formula is satisfied:
in the formula: qiUser i at outdoor temperature TwThermal load of, W;
Qi' -heating design heat load of user i, W;
Tn-calculating the temperature, deg.C, in the heating room;
Tw' -calculating the temperature, DEG C, outside the heating room;
Tw-outdoor temperature, ° c;
qA-heat index of building heating area, W/(m)2)；
Ai-heating area of user i, m2。
The control system adopts quality adjustment or quantity adjustment to determine the flow G required by the heat supply of the user i when the outdoor temperature changesiThe value of (c):
when the system employs mass regulation:
when the system employs volume adjustment:
when the system employs quality regulation that changes the flow in stages: g ═ C, G'
In the formula: gi-traffic of user i, m3/s；
Tg-water temperature of the water supply;
Th-temperature of the backwater.
The operation flow of the user far away from the heat supply point needs to meet the minimum operation flow of the system, and in order to ensure that the user started first obtains the same heat supply effect, the flow of the user relatively close to the user is reduced proportionally, the calculation method is as follows,
in the formula:
when heating is started, the flow rates of the user k, the user k + 1, the user … …, the user n-1 and the user n respectively flow into the heat exchanger.
The valve manager 3 controls the opening and closing of the valve 54 in the user heating branch 52 to control the system operation flow to be larger than the minimum system operation flow, and ensures that the heating effects of n users are consistent before the next operation adjustment under the principle that the flow preferentially flows into the remote users.
Time of heating
The time required for the heat supply medium to flow into the farthest radiator of the user i from the heat source outlet is as follows:
(i＝1、2、3……；j＝1、2、3……)
wherein:
namely, it is
In the formula: v. ofij-flow velocity, m/s, of heat source to different tube sections j of the heat sink furthest from user i;
Lijthe lengths m of different pipe sections j corresponding to different flow rates from the heat source to the radiator at the farthest end of the user i;
dijthe diameters of different pipe sections j corresponding to different flow rates from the heat source to the radiator at the farthest end of the user i are mm;
Gi-traffic of user i, m3/s。
Time t needed by heat supply medium flowing into the farthest radiators of other users from the heat source outletn-1、tn-2、……、t1The calculation method is the same as above.
First of all the flow of the heating user
The end user operation flow which is firstly started during adjustment needs to meet the minimum operation flow of the system. In order to ensure that the users who are started first obtain the same heat supply effect, the flow of the users which are relatively close to each other is proportionally reduced, and the calculation method is as follows.
In the formula:
when heating is started, the flow rates of the user k, the user k + 1, the user … …, the user n-1 and the user n respectively flow into the heat exchanger.
The valve manager 3 performs opening and closing and opening operations on the valve 54 of the designated user according to system requirements to control the system operation flow to be larger than the minimum system operation flow, and ensures that the heating effects of n users are consistent before the next operation adjustment under the principle that the flow flows into the remote users preferentially.
The specific control method is as follows.
First, it is judged
Whether or not greater than Gmin: if yes, firstly closing the inlet valves of the user 1, the user 2, the user … … and the user n-1, and only opening the inlet valve of the user n to enable the heat supply medium to only flow into the user n; if not, then judge
Whether or not greater than Gmin: if yes, firstly closing the inlet valves of the user 1, the user 2, … … and the user n-2, and only opening the inlet valves of the user n-1 and the user n to enable the heat supply medium to only flow into the user n-1 and the user n; if not, then judge
Whether or not greater than Gmin… … repeat the cycle until
And is
At this time, at the start of the adjustment, the inlet valves of the user 1, the user 2, … …, and the user k-1 are closed first, and the inlet valves of the user k, the user k + 1, … …, and the user n are opened only, so that the heat medium flows only into the user k, the user k + 1, … …, and the user n, and the system flow rate is at this time
Elapsed time Δ t1Thereafter, the inlet valve of the user k-1 is opened, while the flow rate of the water pump is adjusted to a total flow rate of
After a lapse of time Δ t2Thereafter, the inlet valve of the user k-2 is opened, while the flow rate of the water pump is adjusted to a total flow rate of
And operate sequentially until a time Δ t elapsesk-1Thereafter, the user 1 inlet valve is opened.
After all the user valves are opened, the valve opening degrees of the user k, the user k + 1, the user … … and the user n are adjusted to make the flow rates of the user k, the user k + 1, the user n and the user n respectively be Gk、Gk+1、……、Gn. The heat supply effect of n users in an adjusting time period delta t' is ensured to be consistent.
An adjustment time period delta t 'refers to the time interval from the beginning of operation adjustment to the next operation adjustment, and the requirement that delta t' is more than or equal to tn+Δt″。
Where Δ t "is the time required for the heating medium to flow from the farthest end heat sink of user n to the heat source.
The specific calculation method is as follows:
Δt1＝tn-tk-1
Δt2＝tk-1-tk-2
Δt3＝tk-2-tk-3
……
Δtk-2＝t3-t2
Δtk-1＝t2-t1
in the formula ofn、tk-1、tk-2、tk-3、……、t3、t2、t1The time required for the heat supply medium to flow from the heat source outlet to the farthest heat sink of the users n, k-1, k-2, k-3, … …, 3, 2, 1, respectively.
The invention considers the influence of the heating distance on the users, not only fundamentally eliminates the horizontal heating power imbalance of the heating system, and leads the near-end and far-end users to achieve the same heating effect, but also improves the regulation characteristic of a pipe network, avoids the increase of the operation energy consumption caused by a large-flow operation mode, and does not need to increase the pipe diameter of a main heating pipeline.
Claims (7)
1. The utility model provides a solve heating system water conservancy imbalance's control system, includes carries out the heat supply pipe network (5) of heat supply for the user, its characterized in that: a valve (54) is arranged in the heat supply pipe network (5), the valve (54) is controlled by a valve manager (3), the valve manager (3) is connected with a parameter calculator (2), the parameter calculator (2) is connected with a numbering device (1), and the numbering device (1) performs sequential numbering;
user-requested thermal load Q1，Q2，……，QnThe following formula is satisfied:
in the formula: qiUser i at outdoor temperature TwThermal load of, W;
Qi' -heating design heat load of user i, W;
Tn-calculating the temperature, deg.C, in the heating room;
Tw' -calculating the temperature, DEG C, outside the heating room;
Tw-outdoor temperature, ° c;
qA-heat index of building heating area, W/(m)2)；
Ai-heating area of user i, m2；
The control system adopts quality adjustment or quantity adjustment to determine the flow G required by the heat supply of the user i when the outdoor temperature changesiThe value of (c):
when the system employs mass regulation:
when the system employs volume adjustment:
when the system employs quality regulation that changes the flow in stages: g ═ C, G'
In the formula：Gi-traffic of user i, m3/s；
Tg-water temperature of the water supply;
Th-the temperature of the backwater;
the operation flow of the user far away from the heat supply point needs to meet the minimum operation flow of the system, and in order to ensure that the user started first obtains the same heat supply effect, the flow of the user relatively close to the user is reduced proportionally, the calculation method is as follows,
in the formula:
when heating is started, the flow rates of the user k, the user k +1, the user … …, the user n-1 and the user n respectively flow into the heat exchanger; t is tiThe time required for the heat supply medium to flow into the farthest radiator of the user i from the heat source outlet is shortened; t is tnThe time required for the heating medium to flow from the heat source outlet into the endmost radiator of the endmost user.
2. A control system for resolving hydraulic imbalance in a heating system as claimed in claim 1, wherein: the valve manager (3) controls opening and closing and opening degrees of the valves (54) in the user heat supply branches (52) so as to control the system operation flow to be larger than the minimum system operation flow, and under the principle that the flow preferentially flows into the remote users, the heat supply effects of n users before the next operation adjustment are consistent.
3. A control system for resolving hydraulic imbalance in a heating system as claimed in claim 1, wherein: the parameter calculator (2) is also connected with an outdoor temperature collector (4), and the outdoor temperature collector (4) collects outdoor temperature.
4. A control system for resolving hydraulic imbalance in a heating system according to claim 3, wherein: the heat supply pipe network (5) comprises a heat supply main pipeline (51), and the heat supply main pipeline (51) is communicated with a user heat supply branch pipeline (52) where users are located.
5. A control system for resolving hydraulic imbalance in a heating system according to claim 4, wherein: a circulating water pump (53) is arranged in the heat supply main pipeline (51), and valves (54) are arranged on the user heat supply branches (52).
6. A control system for solving a hydraulic imbalance in a heating system according to claim 5, wherein: and a control branch (31) which is communicated with the valve (54) in a circuit is arranged at the control end of the valve manager (3).
7. A control system for resolving hydraulic imbalance in a heating system according to claim 6, wherein: the numbering device (1) is used for arranging the control branches (31) in an ascending order from near to far according to the distance of heat supply.
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| CN109764564B (en) * | 2019-01-09 | 2021-04-20 | 青岛海尔空调器有限总公司 | Energy system and control method thereof |
| CN109764544A (en) * | 2019-01-09 | 2019-05-17 | 青岛海尔空调器有限总公司 | A kind of energy resource system and its control method |
| CN109764552B (en) * | 2019-01-09 | 2021-04-20 | 青岛海尔空调器有限总公司 | Energy system and control method thereof |
| CN110805950A (en) * | 2019-09-25 | 2020-02-18 | 武汉德威工程技术有限公司 | Heating household temperature control system and method |
| CN111396982B (en) * | 2020-02-26 | 2021-04-13 | 华电电力科学研究院有限公司 | Thermodynamic coupling hydraulic heat supply network balance adjusting method and heat supply system |
| CN114251716B (en) * | 2021-12-29 | 2023-05-30 | 北京华大智宝电子系统有限公司 | Adjusting parameter determining method and system for adjusting valve of heating pipe network |
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| DE3036661C2 (en) * | 1980-09-29 | 1984-08-02 | Siemens AG, 1000 Berlin und 8000 München | Central hot water heating system |
| DE10057416A1 (en) * | 2000-11-20 | 2002-05-29 | Albert Bauer | Central heating for rooms to be heated |
| CN201293396Y (en) * | 2008-08-29 | 2009-08-19 | 郑安民 | Energy-saving control device for heating system |
| EP2395288B1 (en) * | 2010-06-08 | 2019-01-23 | Comap | Balancing valve |
| CN102003736B (en) * | 2010-12-22 | 2012-11-21 | 哈尔滨工业大学 | Heating load stage quality regulation method |
| CN103363585B (en) * | 2013-08-08 | 2016-04-13 | 天津海天方圆节能技术有限公司 | A kind of downtown areas central heating system control method |
| CN205119224U (en) * | 2015-10-23 | 2016-03-30 | 北京建筑大学 | Hydraulic balance governing system when difference in temperature unsteady flow volume |
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Effective date of registration: 20220907 Address after: No. 114, Area E, Building 6, Life Science Park, No. 8 Shenkong Road, Zhangjiakou High-tech Industrial Development Zone, Hebei, Zhangjiakou City, Hebei Province, 076250 Patentee after: Hebei Zerui energy saving new energy Co.,Ltd. Address before: No. 13 Chaoyang Street, Zhangjiakou, Hebei, Hebei Patentee before: HEBEI University OF ARCHITECTURE |
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Denomination of invention: A control system for solving hydraulic imbalance in heating system Effective date of registration: 20230215 Granted publication date: 20200609 Pledgee: Bank of China Limited Zhangjiakou Qiaoxi Sub-branch Pledgor: Hebei Zerui energy saving new energy Co.,Ltd. Registration number: Y2023980032677 |
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