CN111550867A - Automatic control method of efficient decontamination mixing heat exchange unit - Google Patents
Automatic control method of efficient decontamination mixing heat exchange unit Download PDFInfo
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- CN111550867A CN111550867A CN202010469512.8A CN202010469512A CN111550867A CN 111550867 A CN111550867 A CN 111550867A CN 202010469512 A CN202010469512 A CN 202010469512A CN 111550867 A CN111550867 A CN 111550867A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000005202 decontamination Methods 0.000 title claims abstract description 35
- 230000003588 decontaminative effect Effects 0.000 title claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 189
- 239000008400 supply water Substances 0.000 claims abstract description 26
- 230000001276 controlling effect Effects 0.000 claims description 21
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 6
- 230000006872 improvement Effects 0.000 description 9
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
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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
- F24D19/1012—Arrangement or mounting of control or safety devices for water heating systems for central heating by regulating the speed of a pump
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Abstract
The invention relates to an automatic control method of a high-efficiency decontamination mixing heat exchange unit, the high-efficiency decontamination mixing heat exchange unit comprises a low-region heat exchange unit, a high-region heat exchange unit and a controller, the method is applied to the controller, and the method comprises the following steps: acquiring the temperature of secondary network water supply, the pressure of secondary network water return and the preset frequency of a secondary network circulating pump in a low-region heat exchange unit, and acquiring the temperature of secondary network water supply, the pressure of secondary network water return and the preset frequency of a secondary network circulating pump in a high-region heat exchange unit; the automatic operation of the low-region heat exchange unit is realized according to the temperature of secondary network supply water in the low-region heat exchange unit, the pressure of secondary network return water and the preset frequency of a secondary network circulating pump; according to the secondary network water supply temperature, the secondary network water return pressure and the secondary network circulating pump preset frequency in the high-area heat exchange unit, the automatic operation of the high-area heat exchange unit is realized, the intensity of workers is reduced, and the working efficiency of the high-efficiency decontamination mixed heat exchange unit is improved.
Description
Technical Field
The invention relates to the technical field of heat supply, in particular to an automatic control method of a high-efficiency decontamination mixing heat exchange unit.
Background
At present, plate heat exchange units are adopted in heat exchange stations of residential communities and public enterprises, and along with the application of a high-efficiency decontamination mixing heat exchange unit, an automatic control method matched with the high-efficiency decontamination mixing heat exchange unit is urgently needed to be developed to complete the automatic operation of the high-efficiency decontamination mixing heat exchange unit, so that the intensity of workers is reduced, and the working efficiency of the high-efficiency decontamination mixing heat exchange unit is improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic control method matched with a decontamination mixing heat exchanger unit to ensure the automatic operation of the high-efficiency decontamination mixing heat exchanger unit.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
an automatic control method of a high-efficiency decontamination mixing heat exchanger unit, wherein the high-efficiency decontamination mixing heat exchanger unit comprises a low-region heat exchanger unit, a high-region heat exchanger unit and a controller, the method is applied to the controller, and the method comprises the following steps:
acquiring the temperature of secondary network water supply, the pressure of secondary network water return and the preset frequency of a secondary network circulating pump in the low-region heat exchange unit, and acquiring the temperature of secondary network water supply, the pressure of secondary network water return and the preset frequency of a secondary network circulating pump in the high-region heat exchange unit;
the automatic operation of the low-region heat exchange unit is realized according to the temperature of secondary network supply water in the low-region heat exchange unit, the pressure of secondary network return water and the preset frequency of a secondary network circulating pump;
and realizing the automatic operation of the heat exchange unit in the high area according to the temperature of the secondary network water supply in the heat exchange unit in the high area, the pressure of the secondary network water return and the preset frequency of a secondary network circulating pump.
As a further improvement of the present invention, the acquiring of the temperature of the supply water of the secondary network, the return water pressure of the secondary network and the preset frequency of the circulating pump of the secondary network in the low-region heat exchanger unit includes:
the temperature of the secondary network water supply is obtained through a temperature sensor arranged on a secondary network water supply pipeline in the low-pressure heat exchange unit, the secondary network return water pressure is obtained through a pressure sensor arranged on a secondary network return water pipeline in the low-pressure heat exchange unit, and the preset frequency of the secondary network circulating pump is determined according to the heat supply load and the outdoor weather change.
As a further improvement of the present invention, the implementing the automatic operation of the low-region heat exchanger unit according to the temperature of the secondary-network supply water, the pressure of the secondary-network return water and the preset frequency of the secondary-network circulating pump in the low-region heat exchanger unit includes:
controlling a secondary network circulating pump in the low-region heat exchange unit to operate according to a preset frequency of the secondary network circulating pump;
adjusting the opening degree of a primary network water supply electric adjusting valve in the low-region heat exchanger unit according to the secondary network water supply temperature;
and adjusting the operating frequency of a primary network backwater booster pump in the low-region heat exchange unit according to the secondary network backwater pressure.
As a further improvement of the present invention, the adjusting the opening degree of the electric regulating valve for primary grid supply water in the low-region heat exchanger unit according to the temperature of the secondary grid supply water comprises:
when the temperature of the secondary network water supply reaches a first low-temperature threshold value, increasing the opening degree of a primary network water supply electric regulating valve in the low-region heat exchanger unit so as to improve the temperature of the secondary network water supply;
and when the temperature of the secondary network water supply reaches a first high-temperature threshold value, reducing the opening degree of a primary network water supply electric regulating valve in the low-region heat exchanger unit so as to reduce the temperature of the secondary network water supply.
As a further improvement of the present invention, the adjusting the operating frequency of the primary-network backwater booster pump in the low-region heat exchanger unit according to the secondary-network backwater pressure includes:
when the secondary network backwater pressure reaches a first low-pressure threshold value, reducing the operating frequency of a primary network backwater booster pump in the low-region heat exchange unit so as to improve the secondary network backwater pressure;
and when the secondary network backwater pressure reaches a first high-pressure threshold value, increasing the operating frequency of a primary network backwater booster pump in the low-region heat exchanger unit so as to reduce the secondary network backwater pressure.
As a further improvement of the present invention, the acquiring of the temperature of the supply water of the secondary network, the return water pressure of the secondary network and the preset frequency of the circulating pump of the secondary network in the heat exchanger unit of the high area comprises:
the temperature of the secondary network water supply is obtained through a temperature sensor arranged on a secondary network water supply pipeline in the high-pressure heat exchange unit, the secondary network return water pressure is obtained through a pressure sensor arranged on a secondary network return water pipeline in the high-pressure heat exchange unit, and the preset frequency of the secondary network circulating pump is determined according to the heat supply load and the outdoor weather change.
As a further improvement of the present invention, the implementing of the automatic operation of the heat exchanger unit in the high area according to the temperature of the secondary network supply water, the pressure of the secondary network return water and the preset frequency of the secondary network circulating pump in the heat exchanger unit in the high area comprises:
controlling a secondary network circulating pump in the high-region heat exchange unit to operate according to a preset frequency of the secondary network circulating pump;
adjusting the operating frequency of a primary network water supply booster pump in the high-region heat exchanger unit according to the secondary network water supply temperature;
and adjusting the opening of a primary network backwater electric adjusting valve in the high-region heat exchange unit according to the secondary network backwater pressure.
As a further improvement of the invention, the primary network water supply pressure of the low-region heat exchange unit is obtained by a pressure sensor on a primary network water supply pipeline of the low-region heat exchange unit, and is compared with a first preset pressure threshold and a second preset pressure threshold, wherein the second preset pressure threshold is smaller than the first preset pressure threshold;
when the primary network water supply pressure is determined to be lower than or equal to the first preset pressure threshold value but higher than the second preset pressure threshold value, controlling an alarm unit to give an alarm; and when the controller determines that the primary network water supply pressure is lower than or equal to the second preset pressure threshold value, the primary network water return booster pump, the primary network water supply electromagnetic valve and the primary network water return electromagnetic valve are controlled to be closed.
As a further improvement of the present invention, a temperature sensor on a secondary network water supply pipeline of the low-region heat exchanger unit is used to obtain a secondary network water supply temperature of the low-region heat exchanger unit, and the secondary network water supply temperature is compared with a first preset temperature threshold and a second preset temperature threshold, wherein the second preset temperature threshold is smaller than the first preset temperature threshold;
when the temperature of the secondary network water supply is determined to be equal to or higher than the second preset temperature threshold value but lower than the first preset temperature threshold value, controlling an alarm unit to give an alarm; and when the controller determines that the temperature of the secondary network water supply is equal to or higher than the first preset temperature threshold value, controlling the primary network water return booster pump, the primary network water return electromagnetic valve and the primary water supply and return electromagnetic valve to be closed.
As a further improvement of the invention, the controller acquires the secondary network return water pressure of the low-region heat exchanger unit through a pressure sensor on a secondary network return water pipeline of the low-region heat exchanger unit, compares the secondary network return water pressure with a third preset pressure threshold value and a fourth preset pressure threshold value, and the fourth preset pressure threshold value is smaller than the third preset pressure threshold value;
when the secondary network back water pressure is determined to be lower than or equal to the third preset pressure threshold value but higher than the fourth preset pressure threshold value, controlling an alarm unit to alarm; when the controller determines the secondary net return pressure p22And when the pressure is lower than or equal to the fourth preset pressure threshold value, controlling the secondary network circulating pump to be closed.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
according to the automatic control method of the high-efficiency decontamination mixing heat exchange unit, the controller can realize the automatic operation of the low-region heat exchange unit and the high-region heat exchange unit after acquiring the temperature of the secondary network water supply, the pressure of the secondary network water return and the preset frequency of the secondary network circulating pump in the low-region heat exchange unit and acquiring the temperature of the secondary network water supply, the pressure of the secondary network water return and the preset frequency of the secondary network circulating pump in the high-region heat exchange unit, so that the intensity of workers is reduced, and the working efficiency of the high-efficiency decontamination mixing heat exchange unit is improved; and each protection can play a role in protection, and the blank that the high-efficiency decontamination mixing heat exchange unit has no control logic is filled.
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 some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of an automatic control method for a high-efficiency decontamination mixing heat exchanger unit according to an embodiment of the present invention.
Fig. 2 is a flow chart of adjusting the temperature of the secondary grid supply water during automatic operation of the low-region unit according to the embodiment of the invention.
Fig. 3 is a flow chart of adjusting the water supply pressure of the secondary grid during automatic operation of the low-area unit according to the embodiment of the invention.
Fig. 4 is a logic block diagram of a low-zone unit protection system according to an embodiment of the present invention.
Fig. 5 is a logic block diagram of another low-zone unit protection system according to an embodiment of the present invention.
Detailed Description
For purposes of clarity and a complete description of the present invention, and the like, in conjunction with the detailed description, it is to be understood that the terms "central," "vertical," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the present invention, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
Fig. 1 is a flowchart of an automatic control method for a high-efficiency decontamination mixing heat exchanger unit according to an embodiment of the present invention, where the high-efficiency decontamination mixing heat exchanger unit includes a low-zone heat exchanger unit, a high-zone heat exchanger unit, and a controller, and the method is applied to the controller, and the controller may be a PLC control system, as shown in fig. 1, the method includes:
s101: the method comprises the steps of obtaining the temperature of secondary network water supply in a low-region heat exchange unit, the pressure of secondary network water return and the preset frequency of a circulating pump of a secondary network circulating pump, and obtaining the temperature of secondary network water supply in a high-region heat exchange unit, the pressure of secondary network water return and the preset frequency of the circulating pump of the secondary network circulating pump.
Secondary network water supply temperature t in low-region heat exchanger unit acquired by aiming at controller21Secondary net return pressure p22And the temperature T of the secondary network water supply in the high-area heat exchanger unit21Secondary net return pressure P22In a possible implementation manner, a set of temperature sensor and pressure sensor are arranged on the primary network supply pipeline, the primary network return pipeline, the secondary network supply pipeline and the secondary network return pipeline of the low-region heat exchange unit, and a set of temperature sensor and pressure sensor are arranged on the primary network supply pipeline, the primary network return pipeline, the secondary network supply pipeline and the secondary network return pipeline of the high-region heat exchange unit.
The controller can acquire the temperature t of the secondary network water supply through a temperature sensor arranged on a secondary network water supply pipeline in the low-pressure heat exchange unit21Acquiring the return pressure p of the secondary network by a pressure sensor arranged on a return water pipeline of the secondary network in the low-pressure heat exchange unit22(ii) a Likewise, the controller can also acquire the temperature T of the secondary network water supply through a temperature sensor arranged on a secondary network water supply pipeline in the high-pressure heat exchange unit21And acquiring the return water pressure P of the secondary network through a pressure sensor arranged on a return water pipeline of the secondary network in the high-pressure heat exchanger unit22。
Obtaining preset frequency f of secondary network circulating pump in low-region heat exchange unit aiming at controller2And the preset frequency F of a secondary network circulating pump in a high-area heat exchange unit2May be determined based on heating load and outdoor weather changes, in one possible implementation.
For example: when the heat supply load is 5 megawatts and outdoor weather is changed from minus 10 ℃ to minus 20 ℃, the preset frequency f of a secondary network circulating pump in the low-zone heat exchange unit2Is 42 Hz, and the preset frequency F of a secondary net circulating pump in a high-region heat exchange unit2Is 45 Hz; or when the heat supply load is 5 megawatts and the outdoor weather is changed from minus 20 ℃ to minus 10 ℃, the preset frequency f of the secondary network circulating pump in the low-region heat exchange unit232 Hz secondary net circulating pump F in heat exchanger set in high region2Is 35 Hz.
And the controller executes the step S102 or the step S103 after obtaining the temperature of the secondary network water supply, the pressure of the secondary network water return and the preset frequency of the secondary network circulating pump in the low-region heat exchange unit and the temperature of the secondary network water supply, the pressure of the secondary network water return and the preset frequency of the secondary network circulating pump in the high-region heat exchange unit.
: and the automatic operation of the low-region heat exchange unit is realized according to the temperature of the secondary network water supply in the low-region heat exchange unit, the secondary network water return pressure and the preset frequency of a secondary network circulating pump.
It includes but is not limited to the following steps:
s1021: and controlling a secondary network circulating pump in the low-region heat exchange unit to operate according to the preset frequency of the secondary network circulating pump.
When the controller sets the preset frequency f of the secondary net circulating pump2Then, controlling a secondary network circulating pump in the low-region heat exchange unit according to the preset frequency f of the secondary network circulating pump2And (5) operating.
S1022: and adjusting the opening degree of a primary network water supply electric adjusting valve in the low-region heat exchanger unit according to the secondary network water supply temperature.
In a certain cold period, the temperature t of the secondary network water supply of the heat exchange unit in the low region21Only need set for fixed value can, but daytime, night, weather change cold, weather change warm etc. the emergence of condition can lead to secondary net return water temperature t22Changes so that the temperature t of the supply water of the secondary network21Changes occur so that the heat load of the residential quarter cannot be satisfied. To avoid this, in this embodiment, the controller determines the temperature t of the secondary network supply water21When the temperature t is changed, the temperature t of the secondary network water supply can be controlled by adjusting the opening of the electric regulating valve for the primary network water supply21。
The adjusting mode mainly comprises the following two modes:
first, when judging the temperature t of the supply water of the secondary network21When reaching the first low temperature threshold, the opening degree of a primary network water supply electric regulating valve in the low-region heat exchange unit is increased to improve the temperature t of secondary network water supply21。
Second kindWhen judging the temperature t of the water supply of the secondary network21When reaching the first high temperature threshold, reducing the opening degree of a primary network water supply electric regulating valve in the low-region heat exchange unit so as to reduce the temperature t of secondary network water supply21As shown in fig. 2.
S1023: and adjusting the operating frequency of a primary network backwater booster pump in the low-region heat exchange unit according to the secondary network backwater pressure.
In the heat exchange process, the secondary net back pressure p needs to be maintained22The water supply is maintained in a fixed range, and when the opening degree of the electric regulating valve for supplying water to the primary network is increased, the hot water entering the secondary network is increased, so that the back pressure p of the secondary network is increased22Increasing; when the opening degree of the electric regulating valve for supplying water to the primary network is reduced, hot water entering the secondary network is reduced, so that the back pressure p of the secondary network is reduced22Reduction, therefore, also requires real-time re-watering of the secondary network pressure p22And (6) adjusting.
The adjusting mode mainly comprises the following two modes:
first, when judging the back pressure p of the secondary network22When the first low-pressure threshold is reached, the operating frequency f of a primary network backwater booster pump in the low-region heat exchange unit is reduced12To increase the back pressure p of the secondary net22。
Second, when judging the back pressure p of the secondary net22When the first high-pressure threshold is reached, the operating frequency f of a primary network backwater booster pump in the low-region heat exchange unit is increased12To reduce the secondary net back pressure p22As shown in fig. 3.
S103: and the automatic operation of the heat exchange unit in the high area is realized according to the temperature of the secondary network water supply in the heat exchange unit in the high area, the pressure of the secondary network water return and the preset frequency of a secondary network circulating pump.
It includes but is not limited to the following steps:
s1031: and controlling a secondary network circulating pump in the high-region heat exchange unit to operate according to the preset frequency of the secondary network circulating pump.
When the controller sets the preset frequency F of the secondary net circulating pump2Then, controlling a secondary network circulating pump in the high-area heat exchange unit according to the preset frequency F of the secondary network circulating pump2And (5) operating.
S1032: and adjusting the operating frequency of a primary network water supply booster pump in the high-area heat exchanger unit according to the secondary network water supply temperature.
The adjusting mode mainly comprises the following two modes:
first, when judging the temperature T of the supply water of the secondary network21When the second low-temperature threshold is reached, the operation frequency F of the primary network water supply booster pump in the high-region heat exchange unit is increased11To increase the temperature T of the supply water of the secondary network21。
Second, when judging the temperature T of the supply water of the secondary network21When reaching the second high temperature threshold, reducing the operation frequency F of the primary network water supply booster pump of the high-region heat exchanger unit11To reduce the temperature T of the supply water of the secondary network21。
S1033: and adjusting the opening of a primary network backwater electric adjusting valve in the low-region heat exchange unit according to the secondary network backwater pressure.
The adjusting mode mainly comprises the following two modes:
first, when judging the back pressure P of the secondary net22When the second low-pressure threshold value is reached, the opening degree of the primary network water supply electric regulating valve in the high-region heat exchange unit is reduced so as to improve the secondary network back water pressure P22。
Second, when judging the back pressure P of the secondary net22When the second high-pressure threshold is reached, the opening degree of the primary net water supply electric regulating valve in the high-area heat exchange unit is increased so as to reduce the secondary net water return pressure P22。
The automatic control method of the high-efficiency decontamination mixing heat exchanger unit provided by the embodiment of the invention can also realize automatic alarm and protection functions, as shown in fig. 4 and 5.
The protection method for the low-region heat exchanger unit mainly comprises the following four protection methods:
first, as the primary network supply pressure p11Can automatically alarm and protect when abnormal.
The controller acquires the primary network water supply pressure p of the low-region heat exchange unit through a pressure sensor on a primary network water supply pipeline of the low-region heat exchange unit11The primary net is supplied with water pressure p11And comparing the first preset pressure threshold value with a second preset pressure threshold value, wherein the second preset pressure threshold value is smaller than the first preset pressure threshold value.
When it is determined that the primary-network water supply pressure is lower than or equal to a first preset pressure threshold value but higher than a second preset pressure threshold value, i.e. at p11When the state is low, the alarm unit is controlled to alarm; when the controller determines the primary network supply pressure p11Lower than or equal to a second predetermined pressure threshold, i.e. at p11And in a low state, the primary network return water booster pump, the primary network water supply electromagnetic valve and the primary network return water electromagnetic valve are controlled to be closed.
Second, when the temperature t of the supply water of the secondary network21Can automatically alarm and protect when abnormal.
Acquiring the temperature t of the secondary network supply water of the low-region heat exchanger unit through a temperature sensor on a secondary network water supply pipeline of the low-region heat exchanger unit21The temperature t of the secondary net water supply21Comparing the first preset temperature threshold value with a second preset temperature threshold value, wherein the second preset temperature threshold value is smaller than the first preset temperature threshold value;
when determining the temperature t of the supply water of the secondary network21At or above the second predetermined temperature threshold but below the first predetermined temperature threshold, i.e. at t21When in a high state, the alarm unit is controlled to alarm; when the controller determines the temperature t of the supply water of the secondary network21At or above a first predetermined temperature threshold, i.e. at t21And in a high state, the primary network return water booster pump, the primary network return water electromagnetic valve and the primary network water supply electromagnetic valve are controlled to be closed.
Third, when the secondary net return pressure p22The alarm and protection can be automatically carried out when the abnormity is caused by over-low.
The controller obtains the secondary network return water pressure p of the low-region heat exchange unit through a pressure sensor on a secondary network return water pipeline of the low-region heat exchange unit22Returning the secondary net to the water pressure p22And comparing the pressure with a third preset pressure threshold and a fourth preset pressure threshold, wherein the fourth preset pressure threshold is smaller than the third preset pressure threshold.
When the secondary net back pressure is determined to be lower than or equal to the third preset pressureAt a force threshold but above a fourth predetermined pressure threshold, i.e. at p22When the state is low, the alarm unit is controlled to alarm; when the controller determines the secondary net return pressure p22Lower than or equal to a fourth predetermined pressure threshold, i.e. at p22And when the system is in a low state, controlling the secondary network circulating pump to be closed.
Fourth, when the secondary net return pressure p22And the alarm and protection can be automatically carried out when the abnormity is caused by overhigh temperature.
The controller obtains the back pressure p of the secondary network22Then, the secondary net back pressure p is adjusted22And comparing the fourth preset pressure threshold with a fifth preset pressure threshold and a sixth preset pressure threshold, wherein the sixth preset pressure threshold is smaller than the fifth preset pressure threshold.
When determining the secondary net back pressure p22Equal to or higher than the sixth preset pressure threshold but lower than the fifth preset pressure threshold, i.e. at p22When the water level is high, the control alarm unit alarms and the water discharge electromagnetic valve is opened; when the controller determines the secondary net return pressure p22Equal to or higher than a fifth predetermined pressure threshold, i.e. at p22And in a high state, the primary network water supply electromagnetic valve and the primary network water return electromagnetic valve are controlled to be closed, and the primary network water return booster pump is stopped.
In addition, the primary network backwater booster pump does not close the primary network supply and backwater electromagnetic valve in the dormant period, and the dormant period refers to: when the frequency of the primary network return water booster pump is lower than a set frequency threshold value, in order to protect the safety of the booster pump, the frequency of the booster pump is reduced to 0.
The protection method for the high-area heat exchanger unit mainly comprises the following four protection methods:
first, as the primary network water supply pressure P11Can automatically alarm and protect when abnormal.
When the controller determines that it is currently at P11When the state is low, the alarm unit is controlled to alarm; when the controller determines to be at P11And in a low state, the primary network water supply booster pump is controlled to stop, and the primary network water supply and water return electromagnetic valves are controlled to be closed.
Second, when the temperature of the supply water of the secondary network is T21Can automatically alarm and protect when abnormal。
When the controller determines that it is currently at T21When in a high state, the alarm unit is controlled to alarm; when the controller determines to be at T21And in a high state, controlling the primary network water supply booster pump to stop.
Third, when the secondary net return pressure P22The alarm and protection can be automatically carried out when the abnormity is caused by over-low.
When the controller determines that it is currently at P22When the state is low, the alarm unit is controlled to alarm; when the controller determines to be at P22And when the system is in a low state, controlling the secondary network circulating pump to be closed.
Fourth, when the secondary net return pressure P22And the alarm and protection can be automatically carried out when the abnormity is caused by overhigh temperature.
When the controller determines that it is currently at P22When the water level is high, the alarm unit is controlled to alarm, and the water draining electromagnetic valve is controlled to be opened; when the controller determines to be at P22And in a high state, the primary grid water supply booster pump is controlled to stop, and the primary grid water supply and water return electromagnetic valves are controlled to be closed.
In addition, the primary network backwater booster pump does not close the primary network supply and backwater electromagnetic valve in the dormant period.
According to the automatic control method of the high-efficiency decontamination mixing heat exchange unit, provided by the embodiment of the invention, after the controller obtains the temperature of the secondary network water supply, the pressure of the secondary network water return and the preset frequency of the secondary network circulating pump in the low-region heat exchange unit and obtains the temperature of the secondary network water supply, the pressure of the secondary network water return and the preset frequency of the secondary network circulating pump in the high-region heat exchange unit, the automatic operation of the low-region heat exchange unit and the high-region heat exchange unit can be realized, the intensity of workers is reduced, and the working efficiency of the high-efficiency decontamination mixing heat exchange unit is improved; and each protection can play a role in protection, and the blank that the high-efficiency decontamination mixing heat exchange unit has no control logic is filled.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An automatic control method of a high-efficiency decontamination mixing heat exchanger unit is characterized in that the high-efficiency decontamination mixing heat exchanger unit comprises a low-region heat exchanger unit, a high-region heat exchanger unit and a controller, the method is applied to the controller, and the method comprises the following steps:
acquiring the temperature of secondary network water supply, the pressure of secondary network water return and the preset frequency of a secondary network circulating pump in the low-region heat exchange unit, and acquiring the temperature of secondary network water supply, the pressure of secondary network water return and the preset frequency of a secondary network circulating pump in the high-region heat exchange unit;
the automatic operation of the low-region heat exchange unit is realized according to the temperature of secondary network supply water in the low-region heat exchange unit, the pressure of secondary network return water and the preset frequency of a secondary network circulating pump;
and realizing the automatic operation of the heat exchange unit in the high area according to the temperature of the secondary network water supply in the heat exchange unit in the high area, the pressure of the secondary network water return and the preset frequency of a secondary network circulating pump.
2. The automatic control method of the high-efficiency decontamination mixing heat exchanger unit according to claim 1, wherein the obtaining of the temperature of the secondary network supply water, the pressure of the secondary network return water and the preset frequency of the secondary network circulating pump in the low-region heat exchanger unit comprises:
the temperature of the secondary network water supply is obtained through a temperature sensor arranged on a secondary network water supply pipeline in the low-pressure heat exchange unit, the secondary network return water pressure is obtained through a pressure sensor arranged on a secondary network return water pipeline in the low-pressure heat exchange unit, and the preset frequency of the secondary network circulating pump is determined according to the heat supply load and the outdoor weather change.
3. The automatic control method of the high-efficiency decontamination mixing heat exchanger unit as claimed in claim 2, wherein the automatic operation of the low-region heat exchanger unit according to the temperature of the secondary network supply water, the pressure of the secondary network return water and the preset frequency of the secondary network circulating pump in the low-region heat exchanger unit comprises:
controlling a secondary network circulating pump in the low-region heat exchange unit to operate according to a preset frequency of the secondary network circulating pump;
adjusting the opening degree of a primary network water supply electric adjusting valve in the low-region heat exchanger unit according to the secondary network water supply temperature;
and adjusting the operating frequency of a primary network backwater booster pump in the low-region heat exchange unit according to the secondary network backwater pressure.
4. The automatic control method of the high-efficiency decontamination mixing heat exchanger unit according to claim 3, wherein the adjusting of the opening degree of the electric regulating valve for the primary grid water supply in the low-region heat exchanger unit according to the secondary grid water supply temperature comprises:
when the temperature of the secondary network water supply reaches a first low-temperature threshold value, increasing the opening degree of a primary network water supply electric regulating valve in the low-region heat exchanger unit so as to improve the temperature of the secondary network water supply;
and when the temperature of the secondary network water supply reaches a first high-temperature threshold value, reducing the opening degree of a primary network water supply electric regulating valve in the low-region heat exchanger unit so as to reduce the temperature of the secondary network water supply.
5. The automatic control method for the high-efficiency decontamination mixing heat exchanger unit according to claim 3, wherein the adjusting the operation frequency of the primary network backwater booster pump in the low-region heat exchanger unit according to the secondary network backwater pressure comprises:
when the secondary network backwater pressure reaches a first low-pressure threshold value, reducing the operating frequency of a primary network backwater booster pump in the low-region heat exchange unit so as to improve the secondary network backwater pressure;
and when the secondary network backwater pressure reaches a first high-pressure threshold value, increasing the operating frequency of a primary network backwater booster pump in the low-region heat exchanger unit so as to reduce the secondary network backwater pressure.
6. The automatic control method of the high-efficiency decontamination mixing heat exchanger unit according to claim 1, wherein the obtaining of the temperature of the secondary network supply water, the pressure of the secondary network return water and the preset frequency of the secondary network circulating pump in the high-area heat exchanger unit comprises:
the temperature of the secondary network water supply is obtained through a temperature sensor arranged on a secondary network water supply pipeline in the high-pressure heat exchange unit, the secondary network return water pressure is obtained through a pressure sensor arranged on a secondary network return water pipeline in the high-pressure heat exchange unit, and the preset frequency of the secondary network circulating pump is determined according to the heat supply load and the outdoor weather change.
7. The automatic control method of the high-efficiency decontamination mixing heat exchanger unit as claimed in claim 6, wherein the automatic operation of the high-area heat exchanger unit according to the temperature of the secondary network supply water, the pressure of the secondary network return water and the preset frequency of the secondary network circulating pump in the high-area heat exchanger unit comprises:
controlling a secondary network circulating pump in the high-region heat exchange unit to operate according to a preset frequency of the secondary network circulating pump;
adjusting the operating frequency of a primary network water supply booster pump in the high-region heat exchanger unit according to the secondary network water supply temperature;
and adjusting the opening of a primary network backwater electric adjusting valve in the high-region heat exchange unit according to the secondary network backwater pressure.
8. The automatic control method for the high-efficiency decontamination mixing heat exchanger unit according to claim 1, characterized in that the method further comprises the following steps:
acquiring the primary network water supply pressure of the low-region heat exchanger unit through a pressure sensor on a primary network water supply pipeline of the low-region heat exchanger unit, and comparing the primary network water supply pressure with a first preset pressure threshold value and a second preset pressure threshold value, wherein the second preset pressure threshold value is smaller than the first preset pressure threshold value;
when the primary network water supply pressure is determined to be lower than or equal to the first preset pressure threshold value but higher than the second preset pressure threshold value, controlling an alarm unit to give an alarm; and when the controller determines that the primary network water supply pressure is lower than or equal to the second preset pressure threshold value, the primary network water return booster pump, the primary network water supply electromagnetic valve and the primary network water return electromagnetic valve are controlled to be closed.
9. The automatic control method for the high-efficiency decontamination mixing heat exchanger unit according to claim 1, characterized in that the method further comprises the following steps:
acquiring the temperature of secondary network water supply of the low-region heat exchanger unit through a temperature sensor on a secondary network water supply pipeline of the low-region heat exchanger unit, and comparing the temperature of the secondary network water supply with a first preset temperature threshold and a second preset temperature threshold, wherein the second preset temperature threshold is smaller than the first preset temperature threshold;
when the temperature of the secondary network water supply is determined to be equal to or higher than the second preset temperature threshold value but lower than the first preset temperature threshold value, controlling an alarm unit to give an alarm; and when the controller determines that the temperature of the secondary network water supply is equal to or higher than the first preset temperature threshold value, controlling the primary network water return booster pump, the primary network water return electromagnetic valve and the primary water supply and return electromagnetic valve to be closed.
10. The automatic control method for the high-efficiency decontamination mixing heat exchanger unit according to claim 1, characterized in that the method further comprises the following steps:
the controller acquires the secondary network backwater pressure of the low-region heat exchanger unit through a pressure sensor on a secondary network backwater pipeline of the low-region heat exchanger unit, and compares the secondary network backwater pressure with a third preset pressure threshold value and a fourth preset pressure threshold value, wherein the fourth preset pressure threshold value is smaller than the third preset pressure threshold value;
when the secondary network back water pressure is determined to be lower than or equal to the third preset pressure threshold value but higher than the fourth preset pressure threshold value, controlling an alarm unit to alarm; and when the controller determines that the secondary network back water pressure is lower than or equal to the fourth preset pressure threshold value, controlling a secondary network circulating pump to be closed.
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