CN112963893A - Load tracking type water supplementing method and system for central heating system - Google Patents
Load tracking type water supplementing method and system for central heating system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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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
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- 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
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Abstract
The invention provides a load tracking type water supplementing method of a central heating system, which comprises the following steps: set target pressure PSV(ii) a Collecting time interval signal t and heat source load feedback signal LD(ii) a Collecting the water outlet pressure PAV(ii) a The target pressure P is measuredSVAnd the water outlet pressure PAVComparing and obtaining a comparison result; according to the comparison result, the time interval signal t and the heat source load feedback signal LDForming an execution instruction; and each water replenishing device receives the execution instruction and completes the action corresponding to the execution instruction. The invention has the beneficial effects that: introducing a time interval signal t and a heat source load feedback signal L during water replenishingDAnd the pressure P of the effluentAVThe water replenishing is integrated with time interval control and load control, various water replenishing modes are provided, the water replenishing device can be flexibly set and adjusted according to actual needs, and the problems of frequent pressure relief and frequent water replenishing caused by severe pressure change are perfectly solvedThe work is simplified, the energy is saved, and the device is safe and environment-friendly.
Description
Technical Field
The invention relates to the field of heat supply, in particular to a load tracking type water supplementing method and system for a central heating system.
Background
For economic operation, the load of a boiler is generally adjusted, and the temperature of water supplied to the system is high or low at different time intervals. For example: when the water supply temperature is adjusted to 70 ℃ from 75 ℃, the water temperature is reduced, the volume of water in a system pipe network can be reduced due to expansion with heat and contraction with cold, the pressure is reduced along with the reduction, the automatic water replenishing system can judge that the system pressure is low, the automatic water replenishing is performed on the system, after the water is replenished on the system, more water is stored in the system than before, when the water supply temperature is increased again, the water can expand, and the pressure is increased to release the pressure. In severe conditions, the vicious circulation of water supplement, pressure relief, water supplement and pressure relief can occur, and the safe operation of the system is seriously influenced.
Therefore, in the traditional heat supply treatment and water supplement scheme, the defects of fixed water supplement mode and single constant pressure target value mainly exist, so that the water supplement and pressure relief of a large central heat supply system are frequent, the water and heat are wasted, the system is very unstable in operation, and a lot of troubles are brought to the central heat supply.
Disclosure of Invention
The invention provides a load tracking type water replenishing method and system for a central heating system, which solve the problems in the prior art.
The technical scheme of the invention is realized as follows:
a load tracking type water replenishing method of a central heating system comprises the following steps:
set target pressure PSV；
Collecting time interval signal t and heat source load feedback signal LD；
Collecting the water outlet pressure PAV；
The target pressure P is measuredSVAnd the water outlet pressure PAVComparing and obtaining a comparison result;
according to the comparison result, the time interval signal t and the heat source load feedback signal LDForming an execution instruction;
and each water replenishing device receives the execution instruction and completes the action corresponding to the execution instruction.
Further, based on the feedback current IAVCalculating the water outlet pressure PAVConcrete operationThe method comprises the following steps:
wherein, IminFor feeding back current IAVLower limit value of (1), ImaxFor feeding back current IAVUpper limit value of, PminIs the pressure P of the water outletAVLower limit value of (D), PmaxIs the pressure P of the water outletAVThe upper limit value of (3).
And further, determining a water supplementing mode according to the time interval signal t.
Further, the water replenishing manner includes:
the first water supplementing mode Mod 1: untracked target pressure PSVLow-voltage protection is adopted; when the water outlet pressure P isAVLess than or equal to the target pressure PSVWhen the water content is 15 percent, starting the water replenishing device; when the water outlet pressure P isAVTo the target pressure PSVWhen the water content is 90 percent, stopping supplementing water;
the second water replenishing mode Mod 2: according to the target pressure PSVAnd the pressure P of the effluentAVPerforming constant-pressure water supplement based on a PID control algorithm;
the third water replenishing mode Mod 3: the target pressure P is not tracked within 30 minutes after the target value of the outlet water temperature is increasedSVAt the same time, the pressure value P of the water dischargeH5 percent of the pressure is increased to avoid overpressure water drainage, and after the temperature is increased to the target value of the water outlet temperature, the target pressure P is automatically trackedSV；
Fourth water replenishment mode Mod 4: the target pressure P is not tracked within 30 minutes after the target value of the outlet water temperature is reducedSVAnd simultaneously, the pump starting pressure value P of automatic water supplementLThe temperature is reduced by 5 percent to avoid unnecessary water replenishing caused by temperature reduction, and the target pressure P is automatically tracked after the temperature is reduced to the target value of the outlet water temperatureSV。
Further, a heat source load feedback signal LDMagnitude of change Δ LDThe larger the value of (A), the higher the drain pressure value P of the system pressureHAnd the starting pump pressure value P of automatic water supplementLThe larger the adjustment of (a); heat source load feedback messageNumber LDMagnitude of change Δ LDThe smaller the value of (A), the lower the drain pressure value P of the system pressureHAnd the starting pump pressure value P of automatic water supplementLThe smaller the adjustment of (c).
Preferably, the system pressure is at a bleed pressure value PHAnd the starting pump pressure value P of automatic water supplementLThe trimming mode of (1) is linear adjustment.
Preferably, the system pressure is at a bleed pressure value PHAnd the starting pump pressure value P of automatic water supplementLThe trimming method of (1) is logarithmic LOG adjustment.
Preferably, the heat source load feedback signal LDIncrease the pressure value P of the system pressureHIncreasing the load increase value by 5-8%; heat source load feedback signal LDReduced and automatically-supplemented starting pump pressure value PLAnd reducing the load reduction value by 5-8%.
Furthermore, the load tracking type water replenishing method of the central heating system also collects a compensation signal CPAccording to the comparison result, the time interval signal t and the heat source load feedback signal LDAnd said compensation signal CPForming an execution instruction.
A load tracking water charging system of a central heating system comprises:
parameter setting means for setting a target pressure PSV；
A comparator for comparing the target pressure PSVAnd the water outlet pressure PAVComparing and obtaining a comparison result, and connecting the comparison result with a parameter setting device;
signal acquisition device for acquiring water outlet pressure PAVConnected to the comparator;
the time interval signal device is used for acquiring a time interval signal t and is connected with the comparator;
a load feedback device for collecting heat source load feedback signal LDConnected to the comparator;
a processor for generating the heat source load feedback signal L according to the comparison result, the time period signal t and the heat source load feedback signalDForming execution instructions, andthe comparator is connected;
and the water replenishing devices are used for receiving the execution instruction and completing the action corresponding to the execution instruction, and the number of the water replenishing devices is a plurality of and is connected with the processor and the signal acquisition device.
The invention has the beneficial effects that:
according to the load tracking type water replenishing method and system of the central heating system, a time interval signal t and a heat source load feedback signal L are introduced during water replenishingDAnd the pressure P of the effluentAVThe water replenishing system integrates time interval control and load control into water replenishing, provides various water replenishing modes, can be flexibly set and adjusted according to actual needs, perfectly solves the problems of frequent pressure relief and frequent water replenishing caused by severe pressure change, simplifies work, saves energy, and is safe and environment-friendly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a load tracking water replenishing method of a central heating system according to the present invention;
fig. 2 is a block diagram of a load tracking type water charging system of a central heating system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the load tracking type water replenishing method for a central heating system according to the present invention includes:
set target pressure PSV；
Collecting time interval signal t and heat source load feedback signal LD；
Collecting the water outlet pressure PAV；
The target pressure PSVAnd the pressure P of the discharged waterAVComparing and obtaining a comparison result;
according to the comparison result, the time interval signal t and the heat source load feedback signal LDForming an execution instruction;
and each water replenishing device receives the execution instruction and completes the action corresponding to the execution instruction.
The load tracking type water replenishing method of the central heating system introduces a time interval signal t and a heat source load feedback signal L during water replenishingDAnd the pressure P of the effluentAVThe water replenishing system integrates time interval control and load control into water replenishing, can provide various water replenishing modes based on the time interval control and the load control, can be flexibly set and adjusted according to actual needs, perfectly solves the problems of frequent pressure relief and frequent water replenishing caused by severe pressure change, simplifies work, saves energy, and is safe and environment-friendly.
Based on the feedback current IAVCalculating the water outlet pressure PAVThe specific operation mode is as follows:
wherein, IminFor feeding back current IAVLower limit value of (1), ImaxFor feeding back current IAVUpper limit value of, PminIs the pressure P of the water outletAVLower limit value of (D), PmaxIs the pressure P of the water outletAVThe upper limit value of (3). In particular, the feedback current IAVThe value range of (1) is 4-20 mA, and a current signal and pressure signal correspondence table is as follows:
| type of signal | Lower limit value | Actual value | Upper limit value |
| Current signal | Imin | IAV | Imax |
| Pressure signal | Pmin | PAV | Pmax |
And determining a water supplementing mode according to the time interval signal t. Specifically, the time period may be divided by 24 hours, and this information due to different water outlet temperatures of the time period is used as a feedback signal, and different water replenishing modes are considered in different time periods.
Wherein, the moisturizing mode includes:
the first water supplementing mode Mod 1: untracked target pressure PSVLow-voltage protection is adopted; when the water outlet pressure P isAVLess than or equal to the target pressure PSVWhen the water content is 15 percent, starting the water replenishing device; when the water outlet pressure P isAVTo the target pressure PSVWhen the water content is 90 percent, stopping supplementing water;
the second water replenishing mode Mod 2: according to the target pressure PSVAnd the pressure P of the effluentAVPerforming constant-pressure water supplement based on a PID control algorithm;
the third water replenishing mode Mod 3:the target pressure P is not tracked within 30 minutes after the target value of the outlet water temperature is increasedSVAt the same time, the pressure value P of the water dischargeH5 percent of the pressure is increased to avoid overpressure water drainage, and after the temperature is increased to the target value of the water outlet temperature, the target pressure P is automatically trackedSV；
Fourth water replenishment mode Mod 4: the target pressure P is not tracked within 30 minutes after the target value of the outlet water temperature is reducedSVAnd simultaneously, the pump starting pressure value P of automatic water supplementLThe temperature is reduced by 5 percent to avoid unnecessary water replenishing caused by temperature reduction, and the target pressure P is automatically tracked after the temperature is reduced to the target value of the outlet water temperatureSV。
Specifically, the target value of the outlet water temperature needs to read the set value of field equipment, such as a boiler controller, which is a set parameter of a boiler controller department; discharge water pressure value PHNeeds to be set from the beginning; heat source load feedback signal LDCan be read directly from a field device, such as a boiler controller, without the need for calculations; there is no absolute relation between the actual value of the outlet water temperature and the load, and it is possible that the outlet water temperature is high, but the load is low, or it is possible that the outlet water temperature is low and the load is high, and the load is mainly dependent on the heat demand of the external network.
Wherein, the heat source load feedback signal LDMagnitude of change Δ LDThe larger the value of (A), the higher the drain pressure value P of the system pressureHAnd the starting pump pressure value P of automatic water supplementLThe larger the adjustment of (a); heat source load feedback signal LDMagnitude of change Δ LDThe smaller the value of (A), the lower the drain pressure value P of the system pressureHAnd the starting pump pressure value P of automatic water supplementLThe smaller the adjustment of (c).
Specifically, the change of the load can cause the change of the heating temperature of the system, the temperature change is severe, the more severe the thermal expansion and contraction degree of the circulating water of the system is, the pressure fluctuation is great, and therefore, the heat source load feedback signal LDIt is of great importance.
Wherein, preferably, the drain pressure value P of the system pressureHAnd the starting pump pressure value P of automatic water supplementLThe trimming mode of (1) is linear adjustment. The slope k can be flexibly set, and the trimming formula is linearAnd (4) a formula.
Wherein, preferably, the drain pressure value P of the system pressureHAnd the starting pump pressure value P of automatic water supplementLThe trimming method of (1) is logarithmic LOG adjustment. The logarithm value can be flexibly set, and the trimming formula is the logarithm formula.
Wherein, preferably, the heat source load feedback signal LDIncrease the pressure value P of the system pressureHIncreasing the load increase value by 5-8%; heat source load feedback signal LDReduced and automatically-supplemented starting pump pressure value PLAnd reducing the load reduction value by 5-8%.
Specifically, the control strategy is a case-by-case control strategy, and whether the load is increased or decreased is judged according to the parameters of each time interval, and in the mode, as long as the heat source load feedback signal L is detectedDIncreasing the pressure value of the system pressure by 5-8% of the load increase value, and specifically increasing the load increase value by how much according to the field pipe network bearing capacity, wherein the load increase value can be set according to specific conditions; as long as the heat source load feedback signal L is detectedDReduced and automatically-supplemented starting pump pressure value PLThe load reduction value is reduced by 5-8%, the bearing capacity of a pipe network on site is reduced, and the value can be set according to specific conditions.
The load tracking type water replenishing method of the central heating system also collects a compensation signal CPAccording to the comparison result, the time interval signal t and the heat source load feedback signal LDAnd a compensation signal CPForming an execution instruction.
In particular, the compensation signal CPIn order to eliminate the trimming of disturbance feedback, the trimming is set according to the situation of the site, and parameters used as control are directly set after the trimming, and the presetting can also be directly carried out.
As shown in fig. 2, a load tracking type water charging system of a central heating system includes:
parameter setting means for setting a target pressure PSV；
A comparator for comparing the target pressure PSVAnd the pressure P of the discharged waterAVComparing and obtaining a comparison result, and connecting the comparison result with a parameter setting device;
signal acquisition device for acquiring water outlet pressure PAVConnected with the comparator;
the time interval signal device is used for acquiring a time interval signal t and is connected with the comparator;
a load feedback device for collecting heat source load feedback signal LDConnected with the comparator;
a processor for comparing the time interval signal t with the heat source load feedback signal LDForming an execution instruction, and connecting with the comparator;
and the water replenishing devices are used for receiving the execution instruction and completing the action corresponding to the execution instruction, and the number of the water replenishing devices is a plurality of and is connected with the processor and the signal acquisition device.
The load tracking type water charging system of the central heating system can further comprise:
a compensator for setting the compensation signal C according to the disturbance situation on sitePAnd is connected with the water replenishing device and the comparator.
The invention relates to a load tracking type water replenishing system of a central heating system, which inputs a target pressure P through a parameter setting interface of a parameter setting deviceSVThe signal acquisition device feeds back the water outlet pressure PAVCompensating signal CPTime interval signal t and heat source load feedback signal LDSent to a comparator which compares the target pressure PSVAnd the pressure P of the effluentAVAnd comparing, performing operation processing according to a preset comparison rule, and distributing the result to a water supplementing device for execution, wherein the water supplementing device comprises a water supplementing pump and a frequency converter.
The invention relates to a load tracking type water replenishing method and system of a central heating system, and a target pressure PSVDepending on the circumstances, the operating mode can finally be determined as shown in the following simple example of the table.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A load tracking type water replenishing method of a central heating system is characterized by comprising the following steps:
set target pressure PSV；
Collecting time interval signal t and heat source load feedback signal LD；
Collecting the water outlet pressure PAV；
The target pressure P is measuredSVAnd the water outlet pressure PAVComparing and obtaining a comparison result;
according to the comparison result, the time interval signal t and the heat source load feedback signal LDForming an execution instruction;
and each water replenishing device receives the execution instruction and completes the action corresponding to the execution instruction.
2. The method of claim 1, wherein the method is based on a feedback current IAVCalculating the water outlet pressure PAVThe specific operation mode is as follows:
wherein, IminFor feeding back current IAVLower limit value of (1), ImaxFor feeding back current IAVUpper limit value of, PminIs the pressure P of the water outletAVLower limit value of (D), PmaxIs the pressure P of the water outletAVThe upper limit value of (3).
3. The method according to claim 1, wherein the water replenishment mode is determined according to the time period signal t.
4. The method according to claim 3, wherein the water supplementing manner includes:
the first water supplementing mode Mod 1: untracked target pressure PSVLow-voltage protection is adopted; when the water outlet pressure P isAVLess than or equal to the target pressure PSVWhen the water content is 15 percent, starting the water replenishing device; when the water outlet pressure P isAVTo the target pressure PSVWhen the water content is 90 percent, stopping supplementing water;
the second water replenishing mode Mod 2: according to the target pressure PSVAnd the pressure P of the effluentAVPerforming constant-pressure water supplement based on a PID control algorithm;
the third water replenishing mode Mod 3: the target pressure P is not tracked within 30 minutes after the target value of the outlet water temperature is increasedSVAt the same time, the pressure value P of the water dischargeH5 percent of the pressure is increased to avoid overpressure water drainage, and after the temperature is increased to the target value of the water outlet temperature, the target pressure P is automatically trackedSV；
Fourth water replenishment mode Mod 4: the target pressure P is not tracked within 30 minutes after the target value of the outlet water temperature is reducedSVAnd simultaneously, the pump starting pressure value P of automatic water supplementLThe temperature is reduced by 5 percent to avoid unnecessary water replenishing caused by temperature reduction, and the target pressure P is automatically tracked after the temperature is reduced to the target value of the outlet water temperatureSV。
5. The method of claim 1, wherein the feedback signal L of the heat source load is a heat source load feedback signalDMagnitude of change Δ LDThe larger the value of (A), the higher the drain pressure value P of the system pressureHAnd the starting pump pressure value P of automatic water supplementLThe larger the adjustment of (a); heat source load feedback signal LDMagnitude of change Δ LDThe smaller the value of (A), the lower the drain pressure value P of the system pressureHAnd the starting pump pressure value P of automatic water supplementLThe smaller the adjustment of (c).
6. The method of claim 5The load tracking type water replenishing method of the central heating system is characterized in that the drain pressure value P of the system pressureHAnd the starting pump pressure value P of automatic water supplementLThe trimming mode of (1) is linear adjustment.
7. The method according to claim 5, wherein the drain pressure value P is a pressure value of the system pressureHAnd the starting pump pressure value P of automatic water supplementLThe trimming method of (1) is logarithmic LOG adjustment.
8. A method for supplementing water by load tracking in central heating system according to claim 6 or 7, characterized in that the heat source load feedback signal LDIncrease the pressure value P of the system pressureHIncreasing the load increase value by 5-8%; heat source load feedback signal LDReduced and automatically-supplemented starting pump pressure value PLAnd reducing the load reduction value by 5-8%.
9. The method of claim 1, further comprising collecting a compensation signal CPAccording to the comparison result, the time interval signal t and the heat source load feedback signal LDAnd said compensation signal CPForming an execution instruction.
10. The utility model provides a central heating system's load tracking formula water charging system which characterized in that includes:
parameter setting means for setting a target pressure PSV；
A comparator for comparing the target pressure PSVAnd the water outlet pressure PAVComparing and obtaining a comparison result, and connecting the comparison result with a parameter setting device;
signal acquisition device for acquiring water outlet pressure PAVConnected to the comparator;
the time interval signal device is used for acquiring a time interval signal t and is connected with the comparator;
load feedbackMeans for collecting heat source load feedback signal LDConnected to the comparator;
a processor for generating the heat source load feedback signal L according to the comparison result, the time period signal t and the heat source load feedback signalDForming an execution instruction connected with the comparator;
and the water replenishing devices are used for receiving the execution instruction and completing the action corresponding to the execution instruction, and the number of the water replenishing devices is a plurality of and is connected with the processor and the signal acquisition device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101498468A (en) * | 2009-02-17 | 2009-08-05 | 中国安全生产科学研究院 | Intelligent monitoring system for boiler and heat exchange station |
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| CN205261733U (en) * | 2015-10-20 | 2016-05-25 | 太原市热力公司 | Central heating heating power station secondary side dynamic pressure reducing device |
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| CN211084231U (en) * | 2019-12-19 | 2020-07-24 | 青岛巨川环保科技有限公司 | Automatic control heating system of heating station |
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2021
- 2021-04-08 CN CN202110376028.5A patent/CN112963893B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101498468A (en) * | 2009-02-17 | 2009-08-05 | 中国安全生产科学研究院 | Intelligent monitoring system for boiler and heat exchange station |
| CN102305432A (en) * | 2011-07-19 | 2012-01-04 | 史雪梅 | Monitoring system and method of heat supply network |
| CN205261733U (en) * | 2015-10-20 | 2016-05-25 | 太原市热力公司 | Central heating heating power station secondary side dynamic pressure reducing device |
| CN106123110A (en) * | 2016-08-16 | 2016-11-16 | 河南柴油机重工有限责任公司 | A kind of heat exchange station automatic control system and method |
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