CN113028493A - Online matching and adjusting method for heating load and heat demand of regional heating system - Google Patents

Online matching and adjusting method for heating load and heat demand of regional heating system Download PDF

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CN113028493A
CN113028493A CN202110279139.4A CN202110279139A CN113028493A CN 113028493 A CN113028493 A CN 113028493A CN 202110279139 A CN202110279139 A CN 202110279139A CN 113028493 A CN113028493 A CN 113028493A
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CN113028493B (en
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刘国强
应雨铮
晏刚
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Xian Jiaotong University
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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
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
    • 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
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1048—Counting of energy consumption

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Abstract

The invention discloses an online matching and adjusting method for the heat supply quantity and the heat demand quantity of a district heating system, which comprises the steps of inputting preset parameters, acquiring operation parameters in real time, dynamically adjusting the room temperature of a building, judging whether the building participates in calculation or not, calculating an adjusting factor in real time, calculating the water supply temperature-total pipe pressure difference in real time and adjusting the water supply temperature-total pipe pressure difference in real time; the preset parameters comprise outdoor design temperature T'outIndoor set temperature Tin‑set,jEtc.; the operation parameters comprise the temperature T of the ith temperature measuring point of the jth buildingin,i,jEtc.; building room temperature dynamic regulation to heat supply area weighted temperature Tin,jIs a control target; whether the building participates in the regulation calculation is judged according to the opening degree of the electric regulating valve of the water return pipe; real-time calculation of the adjustment factor includes a comprehensive room temperature correction factor
Figure DDA0002977819230000011
Etc.; on the basis of the above, dynamically calculating a water supply temperature-total pipe pressure difference regulation equation and performing heat exchangeThe primary side electric regulating valve and the secondary side circulating pump are used for regulating. The method can effectively improve the matching degree of the heat supply quantity and the heat demand quantity of the regional heat supply system.

Description

Online matching and adjusting method for heating load and heat demand of regional heating system
Technical Field
The invention relates to a district heating technology, in particular to a method for adjusting the on-line matching of the heating load and the heat demand of a district heating system.
Technical Field
At present, China is the biggest carbon emission country in the world, and the carbon emission peak is reached in 2030. Coal burning of urban district heating systems in northern areas of China is an important factor causing the increase of carbon emission. Generally, heat generated in a heat source needs to be sequentially transferred to radiators in a building through a multi-stage pipe network and a multi-stage heat exchange station to supply heat to a space. The heat source, the foreline network and the foreline heat exchange stations are generally managed by a heating company, while the final line network and the final heat exchange stations directly connected to the building are generally managed by a building property company. Compared with heating companies, property companies have weaker professional ability in heating system regulation. Therefore, the linkage control among the last-stage pipe network, the last-stage heat exchange station and the building is a link which needs to be focused on in the regional heating system in China.
The water supply temperature of the building is controlled by the electric regulating valve at the primary side of the heat exchange station, and the mass flow at the secondary side of the heat exchange station is controlled by the circulating pump. In China, the monitoring and control level of the existing building side heating system is not high, and a proper control strategy is difficult to find, so that the heating load is about 30% higher than the heat demand. That is, the matching degree of the heat supply amount and the heat demand amount is less than 70%. The energy efficiency of the building district heating system mainly depends on the heat supply amount of the heat exchange station, the heat distribution of the secondary pipe network and the heat demand of the terminal building. Therefore, how to realize the high matching of the three links is the key for the efficient operation of the system. However, in the prior art, only a single link is emphasized, three links are not organically connected in series, most of heat exchange station side heat supply regulation equations are formulated based on design working conditions, and the problems that the heat supply quantity of a system is not matched with the heat demand quantity, and the heat power among buildings is unbalanced are caused by not considering the actual connection form of a secondary pipe network, the difference between the actual heat supply parameters and the design heat supply parameters of a terminal building, the dynamic change of the heat supply state of the terminal building and the like.
Disclosure of Invention
Aiming at the problem that the matching degree of the heating load and the heat demand of the district heating system is not high, the invention aims to provide the on-line matching and adjusting method of the heating load and the heat demand of the district heating system.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
a method for adjusting the on-line matching of the heating load and the heat demand of a district heating system comprises the following steps:
step 1, inputting preset parameters of a regional heating system: outdoor design temperature T'outIndoor design temperature T 'of jth building'inIndoor set temperature Tin-set,jTheta heat supply areajHeat supply area theta governed by the ith temperature measuring pointi,jDesign flow rate F'jDesign radiator area R'jActual heat sink area RjHeat exchange factor b of radiatorjFlow regulating factor mujDesign water supply temperature T'sDesign return water temperature T'rIndoor temperature regulation deviation Δ TinThe water supply temperature regulation deviation e (T) of the heat exchange stations) Adjusting deviation e (delta P) of water supply and return pressure;
step 2, acquiring the operation parameters of the district heating system in real time: actual outdoor temperature ToutThe temperature T of the ith temperature measuring point of the jth buildingin,i,jElectric regulating valve opening of water return pipe
Figure BDA0002977819210000021
Actual flow rate FjOpening degree of primary side electric regulating valve of heat exchange station
Figure BDA0002977819210000022
Secondary side circulation pump frequency f, actual water supply temperature Ts,meaActual water supply and return pressure difference delta Pmea；
Step 3, dynamically adjusting the room temperature of the building: calculating the heating area weighted temperature T of the jth building in real timein,jAccording to Tin,j、Tin-set,j、ΔTinDynamic adjustment
Figure BDA0002977819210000031
And 4, judging whether the building participates in the heat supply regulation calculation: if the opening degree of the electric regulating valve of the water return pipe of the jth building
Figure BDA0002977819210000032
Less than 6%, not participating in subsequent calculation; if the opening degree of the electric regulating valve of the water return pipe of the jth building
Figure BDA0002977819210000033
If the ratio is more than 6%, participating in subsequent calculation;
and 5, calculating the heat supply regulation factor in real time: according to the building Tin-set,j、T'in、θjCalculating a comprehensive room temperature correction factor
Figure BDA0002977819210000034
According to building F'jCalculating comprehensive design flow F'totalFrom building R'j、RjCalculating a comprehensive radiator correction factor
Figure BDA0002977819210000035
According to building bjCalculating heat exchange factor b of comprehensive radiatortotalAccording to the building mujCalculating the comprehensive flow regulating factor mutotalAccording to building FjAnd a heat exchange station secondary side delta PmeaCalculating comprehensive pipe network resistance coefficient Stotal；
Step 6, calculating the water supply temperature-total pipe pressure difference in real time: according to T'in、T'out、T's、T'r、Tout、
Figure BDA0002977819210000036
btotal、μtotalReal-time calculation of set water supply temperature Ts-setFrom T'in、T'out、Tout、F'total、Stotal、μtotalReal-time calculation and setting of water supply and return pressure difference delta Pset；
Step 7, adjusting the water supply temperature-total pipe pressure difference in real time: according to Ts,mea、Ts-set、e(Ts) Real-time regulation
Figure BDA00029778192100000310
According to Δ Pmea、ΔPsetE (Δ P) real-time adjusting f.
An on-line matching and adjusting method for the heating load and the heat demand of a district heating system is disclosed, in the step 3,
Figure BDA0002977819210000037
m is the number of temperature measuring points of each building; if Tin,j-Tin-set,j|≤ΔTinThe electric regulating valve of the water return pipe of the building does not act; if Tin,j-Tin-set,j<ΔTinElectric regulating valve for increasing building return water pipe
Figure BDA0002977819210000038
Up to Tin,j＝Tin-set,j+0.5ΔTin(ii) a If Tin,j-Tin-set,j>ΔTinElectric regulating valve for reducing water return pipe of building
Figure BDA0002977819210000039
Up to Tin,j＝Tin-set,j+0.5ΔTin。
An on-line matching and adjusting method for the heating load and the heat demand of a district heating system is disclosed, in the step 5,
Figure BDA0002977819210000041
btotal＝MIN(b1,...,bj,...,bn)；μtotal＝MAX(μ1,...,μj,...,μn)；
Figure BDA0002977819210000042
n is the number of buildings in the district heating system.
On-line matching and adjusting method for heating load and heat demand of district heating systemThe method, in the step 6,
Figure BDA0002977819210000043
Figure BDA0002977819210000044
x is an intermediate variable;
Figure BDA0002977819210000045
an online matching and adjusting method for the heating load and the heat demand of a district heating system is disclosed, in step 7, if | Ts,mea-Ts-set|≤e(Ts) The primary side electric regulating valve of the heat exchange station does not act; if Ts,mea-Ts-set<e(Ts) Electric regulating valve for increasing primary side of heat exchange station
Figure BDA0002977819210000046
Up to Ts,mea＝Ts-set+0.5e(Ts) (ii) a If Ts,mea-Ts-set>e(Ts) Electric regulating valve for reducing primary side of heat exchange station
Figure BDA0002977819210000047
Up to Ts,mea＝Ts-set+0.5e(Ts)。
In step 7, if | Δ P is provided, the method for adjusting the heat supply and the heat demand of the district heating system by online matching is adoptedmea-ΔPsetE (delta P) is less than or equal to | and a secondary side circulating pump of the heat exchange station does not act; if Δ Pmea-ΔPset<e (delta P), and increasing a secondary side circulating pump f of the heat exchange station until delta Pmea＝ΔPset+0.5e (Δ P); if Δ Pmea-ΔPset>e (delta P), reducing a secondary side circulating pump f of the heat exchange station until delta Pmea＝ΔPset+0.5e(ΔP)。
Compared with the prior art, the invention has the following advantages:
1. the heat loss and leakage loss of hot water flowing between the heat exchange station and the building are considered, and the accuracy of the heat supply regulation equation is improved;
2. compared with the arithmetic average temperature, the heating area weighted temperature can more effectively reflect the whole temperature distribution in the building, and the heating area weighted temperature is used as the control target of the electric regulating valve, so that the temperature uniformity and the heating comfort of the building are improved;
3. for buildings with the opening of the electric regulating valve of the water return pipe being less than 6%, the flow of hot water flowing through the electric regulating valve is zero, and the actual heat consumption is zero, so that the buildings do not incorporate heat supply calculation, and the accuracy of the heat supply regulation equation calculation is improved;
4. the comprehensive room temperature correction factor, the comprehensive radiator heat exchange factor and the comprehensive flow regulation factor are embedded into the heat supply quantity regulation equation, the difference between the actual parameters and the design parameters of the heat supply system is considered, and the matching degree of the heat supply quantity and the heat demand quantity can be effectively improved.
Drawings
Fig. 1 is a schematic diagram of an online matching and adjusting method for the heating load and the heat demand of a district heating system according to the present invention.
Fig. 2 is an application case of the method for adjusting the on-line matching of the heating load and the heat demand of the district heating system according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear and concise, the present invention will be described in further detail with reference to the accompanying drawings and an embodiment. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in fig. 1, an online matching and adjusting method for the heating load and the heat demand of a district heating system includes:
step 1, inputting preset parameters of a heating system of a certain area: outdoor design temperature T'outIndoor design temperature T 'of jth building'inIndoor set temperature Tin-set,jTheta heat supply areajHeat supply area theta governed by the ith temperature measuring pointi,jDesign flow rate F'jDesign radiator area R'jActual heat sink area RjHeat exchange factor b of radiatorjFlow regulating factor mujDesign water supply temperature T'sDesign return water temperature T'rIndoor temperature regulation deviation Δ TinThe water supply temperature regulation deviation e (T) of the heat exchange stations) Adjusting deviation e (delta P) of water supply and return pressure;
step 2, acquiring the operation parameters of a heating system of a certain area in real time: actual outdoor temperature ToutThe temperature T of the ith temperature measuring point of the jth buildingin,i,jElectric regulating valve opening of water return pipe
Figure BDA0002977819210000061
Actual flow rate FjOpening degree of primary side electric regulating valve of heat exchange station
Figure BDA0002977819210000062
Secondary side circulation pump frequency f, actual water supply temperature Ts,meaActual water supply and return pressure difference delta Pmea；
Step 3, dynamically adjusting the room temperature of the building: calculating the heating area weighted temperature T of the jth building in real timein,jAccording to Tin,j、Tin-set,j、ΔTinDynamic adjustment
Figure BDA0002977819210000063
And 4, judging whether the building participates in the heat supply regulation calculation: if the opening degree of the electric regulating valve of the water return pipe of the jth building
Figure BDA0002977819210000064
Less than 6%, not participating in subsequent calculation; if the opening degree of the electric regulating valve of the water return pipe of the jth building
Figure BDA0002977819210000065
If the ratio is more than 6%, participating in subsequent calculation;
and 5, calculating the heat supply regulation factor in real time: according to the building Tin-set,j、T'in、θjCalculating a comprehensive room temperature correction factor
Figure BDA0002977819210000066
According to building F'jCalculating comprehensive design flow F'totalFrom building R'j、RjCalculating a comprehensive radiator correction factor
Figure BDA0002977819210000067
According to building bjCalculating heat exchange factor b of comprehensive radiatortotalAccording to the building mujCalculating the comprehensive flow regulating factor mutotalAccording to building FjAnd a heat exchange station secondary side delta PmeaCalculating comprehensive pipe network resistance coefficient Stotal；
Step 6, calculating the water supply temperature-total pipe pressure difference in real time: according to T'in、T'out、T's、T'r、Tout、
Figure BDA0002977819210000071
btotal、μtotalReal-time calculation of set water supply temperature Ts-setFrom T'in、T'out、Tout、F'total、Stotal、μtotalReal-time calculation and setting of water supply and return pressure difference delta Pset；
Step 7, adjusting the water supply temperature-total pipe pressure difference in real time: according to Ts,mea、Ts-set、e(Ts) Real-time regulation
Figure BDA0002977819210000073
According to Δ Pmea、ΔPsetE (Δ P) real-time adjusting f.
FIG. 2 is a small-sized district heating system adopting the heating quantity and heat demand online matching adjusting method, and the system is located in a cold area and has outdoor design temperature T'out-6 ℃ indoor design temperature T'inOther heating design parameters are given in table 1, 18 ℃.
TABLE 1 heating design parameters of heating system in certain area
Figure BDA0002977819210000072
Indoor set temperature T of various buildings in working days and holidaysin-set,jSee table 2.
TABLE 2 heating design parameters for heating system of certain area
Figure BDA0002977819210000081
According to the calculation method shown in fig. 1, the water supply temperature adjustment equation form in different time periods in a certain day is as follows:
Figure BDA0002977819210000082
the supply and return water pressure difference regulating equation is in the form of:
Figure BDA0002977819210000083
wherein alpha is1、α2、α3、β1The values at different time periods are shown in table 3.
TABLE 3 adjustment equation coefficients for heat supply in different time periods
Figure BDA0002977819210000084
Through tests, the coefficient shown in the table 3 is adopted to dynamically adjust the heat supply, and the matching degree of the heat supply of the regional heat supply system and the heat demand reaches more than 90%.

Claims (6)

1. A heating load and heat demand online matching adjusting method for a district heating system is characterized by comprising the following steps:
step 1, inputting preset parameters of a regional heating system: outdoor design temperature T'outIndoor design temperature T 'of jth building'inIndoor set temperature Tin-set,jTheta heat supply areajHeat supply area theta governed by the ith temperature measuring pointi,jDesign flow rate F'jDesign of the radiator surfaceFood of R'jActual heat sink area RjHeat exchange factor b of radiatorjFlow regulating factor mujDesign water supply temperature T'sDesign return water temperature T'rIndoor temperature regulation deviation Δ TinThe water supply temperature regulation deviation e (T) of the heat exchange stations) Adjusting deviation e (delta P) of water supply and return pressure;
step 2, acquiring the operation parameters of the district heating system in real time: actual outdoor temperature ToutThe temperature T of the ith temperature measuring point of the jth buildingin,i,jElectric regulating valve opening of water return pipe
Figure FDA0002977819200000011
Actual flow rate FjOpening degree of primary side electric regulating valve of heat exchange station
Figure FDA0002977819200000012
Secondary side circulation pump frequency f, actual water supply temperature Ts,meaActual water supply and return pressure difference delta Pmea；
Step 3, dynamically adjusting the room temperature of the building: calculating the heating area weighted temperature T of the jth building in real timein,jAccording to Tin,j、Tin-set,j、ΔTinDynamic adjustment
Figure FDA0002977819200000013
And 4, judging whether the building participates in the heat supply regulation calculation: if the opening degree of the electric regulating valve of the water return pipe of the jth building
Figure FDA0002977819200000014
Less than 6%, not participating in subsequent calculation; if the opening degree of the electric regulating valve of the water return pipe of the jth building
Figure FDA0002977819200000015
If the ratio is more than 6%, participating in subsequent calculation;
and 5, calculating the heat supply regulation factor in real time: according to the building Tin-set,j、T'in、θjCalculating a comprehensive room temperature correction factor
Figure FDA0002977819200000016
According to building F'jCalculating comprehensive design flow F'totalFrom building R'j、RjCalculating a comprehensive radiator correction factor
Figure FDA0002977819200000017
According to building bjCalculating heat exchange factor b of comprehensive radiatortotalAccording to the building mujCalculating the comprehensive flow regulating factor mutotalAccording to building FjAnd a heat exchange station secondary side delta PmeaCalculating comprehensive pipe network resistance coefficient Stotal；
Step 6, calculating the water supply temperature-total pipe pressure difference in real time: according to T'in、T'out、T's、T'r、Tout、
Figure FDA0002977819200000021
btotal、μtotalReal-time calculation of set water supply temperature Ts-setFrom T'in、T'out、Tout、F'total、Stotal、μtotalReal-time calculation and setting of water supply and return pressure difference delta Pset；
Step 7, adjusting the water supply temperature-total pipe pressure difference in real time: according to Ts,mea、Ts-set、e(Ts) Real-time regulation
Figure FDA0002977819200000022
According to Δ Pmea、ΔPsetE (Δ P) real-time adjusting f.
2. The method for adjusting the on-line matching of the heating capacity and the heat demand of the district heating system according to claim 1, wherein in the step 3,
Figure FDA0002977819200000023
m is the number of temperature measuring points of each building; if Tin,j-Tin-set,j|≤ΔTinThe electric regulating valve of the water return pipe of the building does not act; if Tin,j-Tin-set,j<ΔTinElectric regulating valve for increasing building return water pipe
Figure FDA0002977819200000024
Up to Tin,j＝Tin-set,j+0.5ΔTin(ii) a If Tin,j-Tin-set,j>ΔTinElectric regulating valve for reducing water return pipe of building
Figure FDA0002977819200000025
Up to Tin,j＝Tin-set,j+0.5ΔTin。
3. The method for adjusting the on-line matching of the heating capacity and the heat demand of the district heating system according to claim 1, wherein in the step 5,
Figure FDA0002977819200000026
Figure FDA0002977819200000027
btotal＝MIN(b1,...,bj,...,bn)；μtotal＝MAX(μ1,...,μj,...,μn)；
Figure FDA0002977819200000028
n is the number of buildings in the district heating system.
4. The method for adjusting the on-line matching of the heating capacity and the heat demand of the district heating system according to claim 1, wherein in the step 6,
Figure FDA0002977819200000031
Figure FDA0002977819200000032
x is an intermediate variable;
Figure FDA0002977819200000033
5. the method as claimed in claim 1, wherein in step 7, if | T is greater than or equal tos,mea-Ts-set|≤e(Ts) The primary side electric regulating valve of the heat exchange station does not act; if Ts,mea-Ts-set<e(Ts) Electric regulating valve for increasing primary side of heat exchange station
Figure FDA0002977819200000034
Up to Ts,mea＝Ts-set+0.5e(Ts) (ii) a If Ts,mea-Ts-set>e(Ts) Electric regulating valve for reducing primary side of heat exchange station
Figure FDA0002977819200000035
Up to Ts,mea＝Ts-set+0.5e(Ts)。
6. The method as claimed in claim 1, wherein in step 7, if | Δ P is usedmea-ΔPsetE (delta P) is less than or equal to | and a secondary side circulating pump of the heat exchange station does not act; if Δ Pmea-ΔPset<e (delta P), and increasing a secondary side circulating pump f of the heat exchange station until delta Pmea＝ΔPset+0.5e (Δ P); if Δ Pmea-ΔPset>e (delta P), reducing a secondary side circulating pump f of the heat exchange station until delta Pmea＝ΔPset+0.5e(ΔP)。
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于微等: "基于在线迭代寻优算法的供热二次管网水力平衡调试方法研究与应用", 《区域供热》 *
介鹏飞等: "基于实际参数的集中供热系统二次网运行调节", 《暖通空调》 *

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Publication number Priority date Publication date Assignee Title
CN115183315A (en) * 2022-06-17 2022-10-14 史登峰 Heating system thermodynamic equilibrium control method, device, equipment, medium and product

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