CN101975417B - Method for regulating critical zero differential pressure state of distributed water pump variable flow heat supply system - Google Patents
Method for regulating critical zero differential pressure state of distributed water pump variable flow heat supply system Download PDFInfo
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Abstract
The invention relates to a method for regulating critical zero differential pressure state of a distributed water pump variable flow heat supply system, belonging to a method for regulating the critical zero differential pressure state of the water pump variable flow heat supply system and solving the problems of difficult realization on the maintenance of critical zero differential pressure state of the whole heating season, low system stability, difficult tracing measurement of critical zero differential pressure point, no determined index for main circulating pump regulation, weak system interference resistance capacity and long transition time of a regulating system. The method comprises the steps of: regulating a water supply temperature of a heat source by a heat source controller; regulating a near-end heating power station: meeting the demand on a secondary side user through a rotating speed regulating variable of a heat supply network circulating pump, wherein the rotating speed regulating variable is obtained from a near-end heating station controller; and regulating a heating power station with a pressurizing pump: obtaining the rotating speed regulating variable of the pressurizing pump of the user through the heating power station controller with the pressurizing pump, and meeting the demand on the secondary side user in the heating power station with the pressurizing pump. The method is used for regulating the critical zero differential pressure state of the heat supply system.
Description
Technical field
The present invention relates to the control method of the critical zero pressure difference state of a kind of water pump unsteady flow amount heating system, be specifically related to the control method of the critical zero pressure difference state of a kind of distributed water pump variable flow heating system, belong to unsteady flow amount heating system technical field.
Background technology
The distributed water heat pump heating system is extensive use at present, and its energy-saving effect also gains public acceptance.But there is following problem in the control method of the critical zero pressure difference state of distributed water pump:
1, system carries out the unsteady flow amount when regulating, and is difficult for being implemented in keeping critical zero pressure difference state to move in whole heating season.
2, work as load variations, when system carries out the adjusting of flow and temperature, because the coupled problem of heating power operating mode and hydraulic regime makes the stability of system reduce.
3, critical zero-pressure almost is difficult for tracking measurement, and the adjusting of main circulation pump does not have definite index.
4, the distributed water pumping system does not have clear and definite regulation scheme, the antijamming capability of system a little less than, the settling time of regulating system is also longer simultaneously.
Above-mentioned technical problem is repaiied in application [J] HVAC of peaceful RBF recurrent neural network in heat supply decoupling zero control 2010 02 phase Chen Lie, Zhu Xueli, Qi Weigui, sides; Qin Xu loyalty in 2002 is in stability analysis [J] HVAC of river hundred million heat supplying air conditioning water systems; In the operation regulation scheme [D] of the distributed frequency conversion heat supply network of Chen Ya celery Tsing-Hua University in 2005 Master of engineering paper and Qin Bing in 2007, Qin Xuzhong etc. embody to some extent in operation regulative mode [J] coal gas of distributed frequency conversion heating system and the heating power.
Summary of the invention
The objective of the invention is for being difficult to of existing of the control method that solves the critical zero pressure difference state of existing distributed water pump realize whole heating keep critical zero pressure difference state operation, low, the critical zero-pressure of the stability of a system almost to be difficult for a little less than index that tracking measurement, main circulation pump are regulated not have to confirm, the system's antijamming capability in season and regulating system settling time length problem, and then the control method of the critical zero pressure difference state of a kind of distributed water pump variable flow heating system is provided.
Technical scheme of the present invention is: the detailed process of the control method of the critical zero pressure difference state of distributed water pump variable flow heating system is:
At the thermal source place; Check-valves is installed in the exit of heat supply network main circulation pump; Stop valve is installed by import department, and the thermal source controller is according to the thermal source outdoor temperature of temperature sensor measurement outside the heat source room, and the supply water temperature of supply water temperature sensor measurement is responsible for regulating the supply water temperature of thermal source;
The adjusting of near-end thermal substation: the method that adopts the matter adjusting at the secondary side of near-end thermal substation heat exchanger; The rotating speed of near-end thermal substation secondary side circulating pump is constant; Near-end thermal substation controller is the cascade control system with weather compensate function; Near-end thermal substation controller comprises climate compensator, master selector, secondary controller and frequency converter; When near-end thermal substation outdoor temperature changes; The outdoor temperature that climate compensator is measured according to near-end thermal substation outdoor temperature sensor is set the supply water temperature of a secondary side, and master selector is regulated according to the secondary side supply water temperature of the near-end thermal substation heat exchanger exit feedback that secondary side supply water temperature of setting and near-end user secondary side temperature sensor record, through calculating primary side confession backwater pressure differential resetting value; The near-end thermal substation primary side that secondary controller then supplies backwater pressure differential resetting value and near-end thermal substation primary side differential pressure pickup to record according to primary side supplies backwater pressure reduction value of feedback to calculate; Obtain the rotational speed regulation amount of heat supply network main circulation pump, regulate the rotating speed of heat supply network main circulation pump then through frequency converter, satisfy secondary side user's demand;
The adjusting of the thermal substation of band force (forcing) pump: other user is the thermal substation of band force (forcing) pump; Adopt the method for matter adjusting at the secondary side of the thermal substation heat exchanger of being with force (forcing) pump; The rotating speed of the secondary side circulating pump of the thermal substation of band force (forcing) pump is constant; The thermal substation controller of band force (forcing) pump is the cascade control system with weather compensate function; The thermal substation controller of band force (forcing) pump comprises climate compensator, master selector, secondary controller and frequency converter equally; Primary side at the thermal substation heat exchanger of being with force (forcing) pump is equipped with user's force (forcing) pump; The thermal substation controller of band force (forcing) pump constitutes the cascade control system with weather compensate function, and when the thermal substation outdoor temperature of band force (forcing) pump changed, the outdoor temperature that climate compensator is measured according to the thermal substation outdoor temperature sensor of band force (forcing) pump was set the supply water temperature of a secondary side; The secondary side supply water temperature of the outlet feedback of the thermal substation heat exchanger of the band force (forcing) pump that master selector records according to the secondary side temperature of thermal substation sensor of secondary side supply water temperature of setting and band force (forcing) pump is regulated; Supply backwater pressure differential resetting value through calculating primary side, secondary controller then supplies the thermal substation primary side of the band force (forcing) pump that the thermal substation primary side differential pressure pickup of backwater pressure differential resetting value and band force (forcing) pump records to supply backwater pressure reduction value of feedback to calculate according to primary side, obtains the rotational speed regulation amount of user's force (forcing) pump; Regulate the rotating speed of user's force (forcing) pump then through frequency converter, satisfy the thermal substation secondary side user's of band force (forcing) pump demand.
The present invention compared with prior art has following effect: near-end thermal substation controller of the present invention is the cascade control system with weather compensate function with the thermal substation controller of band force (forcing) pump; Strengthen the antijamming capability of regulating system, also shortened the settling time of regulating system.The present invention has realized keeping in whole heating season critical zero pressure difference state operation, stability of a system height, critical zero-pressure almost to need not tracking measurement, and main circulation pump is regulated has definite index.
Description of drawings
Fig. 1 is the regulating system schematic diagram of the not good enough near-end user pressure reduction of constant critical zero-pressure; Fig. 2 is the adjusting control block diagram of near-end thermal substation; Fig. 3 is the adjusting control block diagram of the thermal substation of band force (forcing) pump, and Fig. 4 is the computational analysis figure that the control method of the critical zero pressure difference dotted state of the distributed water pump of employing is controlled heat supply network.
The specific embodiment
The specific embodiment one: combine Fig. 1-Fig. 3 that this embodiment is described, the detailed process of the control method of the critical zero pressure difference state of distributed water pump variable flow heating system of this embodiment is:
At the thermal source place; Check-valves 1-2 is installed in the exit of heat supply network main circulation pump 2-8; Stop valve 1-3 installs in import department; The thermal source outdoor temperature that thermal source controller 1-5 measures according to thermal source outdoor temperature sensor 1-6, and the supply water temperature of supply water temperature sensor 1-4 measurement is responsible for regulating the supply water temperature of thermal source 1-1;
The adjusting of near-end thermal substation: the method that adopts the matter adjusting at the secondary side of near-end thermal substation heat exchanger 2-5; The rotating speed of near-end thermal substation secondary side circulating pump 2-6 is constant; Near-end thermal substation controller 2-1 is the cascade control system with weather compensate function; Near-end thermal substation controller 2-1 comprises climate compensator, master selector, secondary controller and frequency converter; When near-end thermal substation outdoor temperature changes; The outdoor temperature that climate compensator is measured according to near-end thermal substation outdoor temperature sensor 2-2 is set the supply water temperature of a secondary side, and master selector is regulated according to the secondary side supply water temperature of the near-end thermal substation heat exchanger 2-5 outlet feedback that the secondary side supply water temperature of setting and near-end user secondary side temperature sensor 2-3 record, through calculating primary side confession backwater pressure differential resetting value; The near-end thermal substation primary side that secondary controller then supplies backwater pressure differential resetting value and near-end thermal substation primary side differential pressure pickup 2-4 to record according to primary side supplies backwater pressure reduction value of feedback to calculate; Obtain the rotational speed regulation amount of heat supply network main circulation pump 2-8, regulate the rotating speed of heat supply network main circulation pump 2-8 then through frequency converter, satisfy the demand of secondary side user 2-7;
The adjusting of the thermal substation of band force (forcing) pump: other user is the thermal substation of band force (forcing) pump; Adopt the method for matter adjusting at the secondary side of the thermal substation heat exchanger 3-6 that is with force (forcing) pump; The rotating speed of the secondary side circulating pump 3-2 of the thermal substation of band force (forcing) pump is constant; The thermal substation controller 3-7 of band force (forcing) pump is the cascade control system with weather compensate function; The thermal substation controller of band force (forcing) pump comprises climate compensator, master selector, secondary controller and frequency converter equally; Primary side at the thermal substation heat exchanger 3-6 that is with force (forcing) pump is equipped with user's force (forcing) pump 3-1; The thermal substation controller 3-7 of band force (forcing) pump constitutes the cascade control system with weather compensate function; When the thermal substation outdoor temperature of band force (forcing) pump changes; The outdoor temperature that climate compensator is measured according to the thermal substation outdoor temperature sensor 3-4 of band force (forcing) pump is set the supply water temperature of a secondary side, and the secondary side supply water temperature of the outlet feedback of the thermal substation heat exchanger 3-6 of the band force (forcing) pump that master selector records according to the secondary side temperature of thermal substation sensor 3-3 of secondary side supply water temperature of setting and band force (forcing) pump is regulated, and supplies backwater pressure differential resetting value through calculating primary side; Secondary controller then supplies the thermal substation primary side of the band force (forcing) pump that the thermal substation primary side differential pressure pickup 3-5 of backwater pressure differential resetting value and band force (forcing) pump records to supply backwater pressure reduction value of feedback to calculate according to primary side; Obtain the rotational speed regulation amount of user's force (forcing) pump 3-1, regulate the rotating speed of user's force (forcing) pump 3-1 then through frequency converter, satisfy the demand of the thermal substation secondary side user 3-8 of band force (forcing) pump.
Embodiment: as shown in Figure 4: existing branched network has ten users and in heat supply network, evenly distributes.4-1 is the lift of water pump, and 4-2 is the main water supply line ball under the design conditions, and 4-3 is the main water supply line ball under the minimum load; 4-4 is user's under the design conditions an available pressure reduction, and user's available pressure reduction when 4-5 is minimum load, 4-6 are the backwater line ball of main under the minimum load; 4-7 is the backwater line ball of main under the design conditions; 2-8 is the thermal source main circulation pump, and 2-7 is a near-end user, and 3-1 is user's force (forcing) pump; 3-8 supposes that for the user of band force (forcing) pump each user's available pressure head is 10mH under the design conditions
2O, each user's available pressure head is 5mH during minimum load
2O.The distributed water pumping system keeps critical zero pressure difference state to automatically adjust at full heating season, analyze under its design conditions with minimum load under hydraulic regime, and computing system hydraulic pressure distribution situation.The lift 26mH of thermal source main circulation pump 2-8 under the design conditions
2O, thermal source loss 10mH
2O, flow 300t/h; The flow of force (forcing) pump 3-1 is all 30t/h, and force (forcing) pump 3-1 is followed successively by 4m, 12m, 18m, 24m, 30m, 36m, 42m, 48m, 54m according to hot its lift of user's order.Thermal source main circulation pump 2-8 lift 16mH under the minimum load
2O, wherein thermal source loss 8mH
2O, flow 210t/h; Force (forcing) pump 3-1, flow is all 21t/h, and user's force (forcing) pump 3-1 is followed successively by 3m, 6m, 9m, 12m, 15m, 18m, 21m, 24m, 27m according to hot its lift of user's order.
The computational analysis of heat supply network being controlled through the control method that adopts the critical zero pressure difference state of distributed water pump; The zero-pressure that can see system almost moves between 2～3 users; Also may between 1～3 user or 2～4 users, move, belong to the change zero-pressure and almost regulate; The not good enough position of critical zero-pressure does not need monitoring and measuring, has just kept the state of critical zero pressure difference as long as guarantee the available pressure head demand of thermal source most proximal end user 2-7.This kind scheme is the collecting and distributing type regulation scheme, and when customer charge changed, thermal source controller 1-5 was responsible for regulating the supply water temperature of thermal source 1-1; Near-end thermal substation controller 2-1, band force (forcing) pump thermal substation controller 3-7 are responsible for regulating the temperature of secondary side and the pressure reduction of primary side separately, thermal source controller 1-5; Near-end thermal substation controller 2-1; Band force (forcing) pump thermal substation controller 3-7 divides the work clearly to have solved the coupled problem of heating power operating mode and hydraulic regime separately, has strengthened the stability of system.Decide the not good enough regulative mode of zero-pressure and compare and become the not good enough regulative mode of zero-pressure, the operation power consumption in its whole heating season is little, and system's operation is more energy-conservation.And in deciding the not good enough various regulative modes of zero-pressure, be base value as if the power consumption with change zero-pressure not good enough regulative mode whole heating season, the pressure reduction power consumption of constant near-end user is 89.4% of a base value in the critical zero pressure difference point range.Compare with traditional method of operation, the fractional energy savings of constant near-end user system is 19.6% in the critical zero pressure difference point range.
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| CN102278784B (en) * | 2011-05-13 | 2013-07-17 | 新疆西部热力集团有限公司 | Distributed direct-mixing heat supply system |
| CN102305432B (en) * | 2011-07-19 | 2013-08-07 | 史雪梅 | Monitoring system and method of heat supply network |
| CN102944034B (en) * | 2012-11-28 | 2015-05-13 | 哈尔滨工业大学 | Multistage distributed water pump heat supply system and design method thereof |
| CN102966991B (en) * | 2012-12-19 | 2014-12-10 | 哈尔滨工业大学 | Distributed water mixing and pressurized heat supply system having decoupling function and design method of system |
| RU2624428C1 (en) * | 2016-04-04 | 2017-07-03 | Федеральное государственное автономное образовательное учреждение высшего образования "Белгородский государственный национальный исследовательский университет" (НИУ "БелГУ") | Room air temperature through facade control device |
| EP3399247A1 (en) | 2017-05-02 | 2018-11-07 | E.ON Sverige AB | District energy distributing system |
| CN115076766A (en) * | 2022-06-16 | 2022-09-20 | 临汾市热力供应有限公司 | Operation method for hydraulic balance of heat supply pipe network |
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| CN101344274A (en) * | 2008-08-25 | 2009-01-14 | 北京硕人时代科技有限公司 | Boiler heat supplying climate compensating system and its implementing method |
| CN101761964A (en) * | 2008-10-29 | 2010-06-30 | 张明亮 | Temperature-changing variable-quantity heating and heat exchange equipment |
| CN101769553A (en) * | 2008-12-30 | 2010-07-07 | 张明亮 | Circulating water heating system of secondary pump |
| CN201606968U (en) * | 2010-02-10 | 2010-10-13 | 山东科技大学 | Heating climate compensation frequency conversion control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101344274A (en) * | 2008-08-25 | 2009-01-14 | 北京硕人时代科技有限公司 | Boiler heat supplying climate compensating system and its implementing method |
| CN101761964A (en) * | 2008-10-29 | 2010-06-30 | 张明亮 | Temperature-changing variable-quantity heating and heat exchange equipment |
| CN101769553A (en) * | 2008-12-30 | 2010-07-07 | 张明亮 | Circulating water heating system of secondary pump |
| CN201606968U (en) * | 2010-02-10 | 2010-10-13 | 山东科技大学 | Heating climate compensation frequency conversion control device |
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