CN112859940B - Multi-water-tank liquid level control system of boiler - Google Patents
Multi-water-tank liquid level control system of boiler Download PDFInfo
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- CN112859940B CN112859940B CN202110078138.3A CN202110078138A CN112859940B CN 112859940 B CN112859940 B CN 112859940B CN 202110078138 A CN202110078138 A CN 202110078138A CN 112859940 B CN112859940 B CN 112859940B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
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Abstract
The invention relates to a liquid level control system for multiple water tanks of a boiler, which comprises: the water pump and the water return valves respectively correspond to the boiler water tanks; the liquid level sensor is used for measuring the liquid level of the corresponding water tank; a controller configured to perform the steps of: receiving data collected by each liquid level sensor; respectively obtaining the liquid levels of each boiler water tank at the previous moment and the current moment, and obtaining the liquid level change value of each boiler water tank at the current moment compared with the previous moment; judging whether each boiler water tank is in operation or not based on the liquid level change value of each boiler water tank at the current moment compared with the previous moment; when only one boiler water tank is in operation, a water pump and a water return valve corresponding to the boiler water tank are started; when a plurality of boiler water tanks are in operation, selecting all the boiler water tanks with the lowest liquid level at the current moment in the boiler water tanks in operation, and starting a water pump and a water return valve corresponding to the boiler water tanks. Compared with the prior art, the invention has the advantages of improving the energy-saving effect, ensuring the safety of the boiler and the like.
Description
Technical Field
The invention relates to condensate water return control of a multi-boiler water tank, in particular to a multi-boiler water tank liquid level control system.
Background
For a heating system, a boiler and boiler room equipment are usually used to produce steam, and the steam is then sent to a user through a heat pipeline to meet the requirements of a production process or living heating. With the development of production, boiler equipment is increasingly widely applied to various departments of modern industry, the growth of energy sources is greatly lagged behind the growth of production, and the development of potential, improvement of the thermal efficiency and improvement of the effective utilization rate of energy sources have important practical significance in the aspect of large and wide heat supply boilers.
In a boiler system, it is necessary to soften boiler water and remove oxygen from the water to reduce oxygen corrosion of the boiler. The quality of condensed water generated in the operation process of the boiler is far higher than that of softened water, and the condensed water is high-quality heat source water supply, so that the fuel consumption of the boiler can be obviously reduced, the softened water amount is reduced, and the steam production cost is reduced.
For example, chinese patent CN103134043A discloses a boiler system with a U-shaped flue and a boiler water charging system, the boiler system with the U-shaped flue further includes: a condensed water tank; and a condensed water outlet is arranged at the bottom of the rear end J-shaped flue and is connected with a condensed water tank for discharging condensed water in the rear end J-shaped flue into the condensed water tank, and the condensed water tank is used for boiler water supplement, pipe network water supplement or other purposes after conveying the condensed water to a water treatment system.
However, the existing boiler water tank liquid level control system also adopts a single-loop control system, and a liquid level control system suitable for multiple water tanks is not provided, so that when a boiler unit is formed by a plurality of boilers, water is supplied to different boilers through the boiler water tanks. The operation of the boiler unit is scheduled by a production plan, and the started boiler and the corresponding boiler water tank are also flexibly scheduled. Under the condition, the boiler water tank which supplies water to the boiler needs to be selected for condensate water recovery, otherwise, the condensate water returns to the boiler water tank which is not in use, the energy-saving effect is seriously influenced, and potential safety hazards exist.
Disclosure of Invention
The invention aims to provide a multi-water-tank liquid level control system of a boiler, which can improve the energy-saving effect in the environment of a multi-boiler water tank by selecting a boiler water tank for water supplement by using a condensate water tank according to the liquid level change and avoid potential safety hazards caused by improper water supplement.
The purpose of the invention can be realized by the following technical scheme:
a boiler multi-tank liquid level control system comprising:
the water pump and the return valves respectively correspond to the boiler water tanks, the input end of the water pump is connected to the output end of the condensed water tank, the output end of the water pump is respectively connected to the input end of each return valve, and the output end of each return valve is respectively connected to the input end of the corresponding boiler water tank;
a plurality of liquid level sensors, which are respectively corresponding to the condensed water tank and each boiler water tank and are configured to measure the liquid level of the corresponding water tank;
a controller connected to the water pump, the water return valves, the water replenishment valves, and the liquid level sensors, respectively, configured to perform the steps of:
receiving data collected by each liquid level sensor;
respectively obtaining the liquid levels of each boiler water tank at the previous moment and the current moment, and obtaining the liquid level change value of each boiler water tank at the current moment compared with the previous moment;
judging whether each boiler water tank is in operation or not based on the liquid level change value of each boiler water tank at the current time compared with the previous time;
when only one boiler water tank is in operation, a water pump and a water return valve corresponding to the boiler water tank are started;
when a plurality of boiler water tanks are in operation, selecting all the boiler water tanks with the lowest liquid level at the current moment in the boiler water tanks in operation, and starting a water pump and a water return valve corresponding to the boiler water tanks.
The controller is configured to further perform the steps of: and judging whether the current water level of the condensed water tank is higher than the starting water level or not, and if not, locking the water pump to be in a closed state.
The boiler water tank is also connected to a water replenishing pipeline through a water replenishing valve.
When only a boiler water tank is in operation, open water pump and the return valve that corresponds to this boiler water tank, specifically include:
when only one boiler water tank is in operation, the liquid level of the boiler water tank at the current moment is judged:
if the liquid level of the boiler water tank at the current moment is lower than a first set threshold value, starting a water pump and a water return valve corresponding to the boiler water tank, starting a water replenishing valve corresponding to the boiler water tank, continuously monitoring the liquid level of the boiler water tank,
and if the liquid level of the boiler water tank exceeds a second set threshold value, starting a water pump and a water return valve corresponding to the boiler water tank.
When a plurality of boiler water tanks are in operation, select the boiler water tank that the liquid level is the lowest at the moment among all boiler water tanks in operation, open water pump and the return valve that corresponds to this boiler water tank, include:
when a plurality of boiler water tanks are in operation, selecting the boiler water tank with the lowest liquid level at the current moment from all the boiler water tanks in operation, and judging the liquid level of the boiler water tank at the current moment:
if the liquid level of the boiler water tank at the current moment is lower than a first set threshold value, starting a water pump and a water return valve corresponding to the boiler water tank, starting a water replenishing valve corresponding to the boiler water tank, continuously monitoring the liquid level of the boiler water tank,
if the liquid level of the boiler water tank exceeds a second set threshold value, a water pump and a water return valve corresponding to the boiler water tank are started, and the liquid level of the boiler water tank is continuously monitored.
The first set threshold and the second set threshold are equal.
The controller is configured to perform the further steps of: and when the vertical liquid level of any boiler exceeds a fourth set threshold value, sending an alarm signal to the outside.
The liquid level sensor is a turning plate type liquid level meter or a pressure type liquid level meter.
The controller is a PLC controller.
The controller is a single chip microcomputer.
Compared with the prior art, the invention has the following beneficial effects:
1) Through selecting the boiler water tank to the liquid level change and utilizing the condensate tank to carry out the moisturizing, can improve energy-conserving effect under the environment of many boiler water tanks to avoid the potential safety hazard that the moisturizing is improper arouses.
2) The low water level protection of the condensate water tank is arranged, and the safety is improved.
3) The first set threshold and the second set threshold are used as on-off control conditions of the water replenishing valve, so that water can be replenished through condensed water as far as possible, and the energy-saving effect is improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
wherein: 1. a condensate water tank, 2, a water pump, 3, a water return valve, 4, a boiler water tank, 5, a water replenishing valve, 6 and a water replenishing pipeline.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
A boiler multi-tank liquid level control system, as shown in fig. 1, comprising:
the water pump 2 and the return valves 3 respectively corresponding to the boiler water tanks 4 are arranged, wherein the input end of the water pump 2 is connected to the output end of the condensed water tank 1, the output end of the condensed water tank is respectively connected to the input end of each return valve 3, and the output end of each return valve is respectively connected to the input end of the corresponding boiler water tank 4;
a plurality of liquid level sensors, which are respectively corresponding to the condensed water tank 1 and each boiler water tank 4 and are configured to measure the liquid level of the corresponding water tank;
a controller connected to the water pump 2, the water return valves 3, the water replenishment valves 5, and the liquid level sensors, respectively, and configured to perform the steps of:
receiving data collected by each liquid level sensor;
respectively obtaining the liquid levels of each boiler water tank 4 at the previous moment and the current moment, and obtaining the liquid level change value of each boiler water tank 4 at the current moment compared with the previous moment;
judging whether each boiler water tank 4 is in operation or not based on the liquid level change value of each boiler water tank 4 at the current moment compared with the previous moment;
when only one boiler water tank 4 is in operation, the water pump 2 and the water return valve 3 corresponding to the boiler water tank 4 are started;
when a plurality of boiler water tanks 4 are in operation, the boiler water tank 4 with the lowest liquid level at the current moment in all the boiler water tanks 4 in operation is selected, and the water pump 2 and the water return valve 3 corresponding to the boiler water tank 4 are started.
Through selecting boiler water tank 4 to utilize condensate tank 1 to carry out the moisturizing to the liquid level change, can improve energy-conserving effect under the environment of many boiler water tank 4 to avoid the potential safety hazard that the moisturizing arouses improperly.
In some embodiments, the controller is configured to perform the further steps of: judging whether the current water level of the condensed water tank 1 is higher than the starting water level or not, if not, locking the water pump 2 to be in a closed state, setting the low water level protection of the condensed water tank 1, improving the safety, not triggering any action of the water pump 2 when the condensed water tank 1 is at the low liquid level, and controlling the water pump 2 to be opened by the controller when the condensed water tank 1 is at the medium liquid level; and forcibly stopping the water pump 2 when the condensed water tank 1 supplies water to a low liquid level, and repeatedly and circularly starting the water pump 2 when the liquid level of the condensed water tank 1 rises to a medium liquid level again, wherein the controller controls the alarm device when the condensed water tank 1 is at a high liquid level, and the alarm device gives an alarm.
In some embodiments, boiler water tank 4 is also connected to a water replenishment line 6 through a water replenishment valve 5.
Correspondingly, when only one boiler water tank 4 is in operation, open water pump 2 and the backwater valve 3 corresponding to this boiler water tank 4, specifically include:
when only one boiler water tank 4 is in operation, the liquid level of the boiler water tank 4 at the current moment is judged:
if the liquid level of the boiler water tank 4 at the current moment is lower than a first set threshold value, starting a water pump 2 and a water return valve 3 corresponding to the boiler water tank 4, starting a water replenishing valve 5 corresponding to the boiler water tank 4, continuously monitoring the liquid level of the boiler water tank 4,
if the liquid level of the boiler water tank 4 exceeds a second set threshold value, the water pump 2 and the water return valve 3 corresponding to the boiler water tank 4 are started.
In contrast, when there are a plurality of boiler water tanks 4 in operation, the boiler water tank 4 with the lowest liquid level at the present time among all the boiler water tanks 4 in operation is selected, and the water pump 2 and the return valve 3 corresponding to the boiler water tank 4 are turned on, including:
when a plurality of boiler water tanks 4 are in operation, selecting the boiler water tank 4 with the lowest liquid level at the current moment from all the boiler water tanks 4 in operation, and judging the liquid level of the boiler water tank 4 at the current moment:
if the liquid level of the boiler water tank 4 at the current moment is lower than a first set threshold value, starting the water pump 2 and the water return valve 3 corresponding to the boiler water tank 4, starting the water replenishing valve 5 corresponding to the boiler water tank 4, continuously monitoring the liquid level of the boiler water tank 4,
if the liquid level of the boiler water tank 4 exceeds a second set threshold value, the water pump 2 and the water return valve 3 corresponding to the boiler water tank 4 are started, and the liquid level of the boiler water tank 4 is continuously monitored.
In some of these embodiments, the first set threshold and the second set threshold are equal, and the control logic is simpler.
The controller is configured to further perform the steps of: and when the vertical liquid level of any boiler exceeds a fourth set threshold value, sending an alarm signal to the outside.
The liquid level sensor is a turning plate type liquid level meter or a pressure type liquid level meter, and the controller is a PLC controller or a single chip microcomputer.
In one embodiment, the liquid level of the water tank is measured by a flap type liquid level meter or a pressure type liquid level meter, a switch of the flap type liquid level sensor or the pressure type liquid level sensor is switched on, and the liquid level height H of each boiler water tank 4 before the boiler starts to operate is detected 01 、H 02 、、、H 0n (ii) a When the boiler starts to operate, namely the liquid level of the boiler water tank 4 descends, the liquid level height H of each boiler water tank 4 is dynamically measured by the flap type liquid level sensor or the pressure type liquid level sensor t1 、H t2 、、、H tn ；
The turning plate type liquid level sensor or the pressure type liquid level sensor inputs a liquid level measurement signal to the S7-200PLC controller or the singlechip, and the S7-200PLC controller or the singlechip calculates to obtain a liquid level variation value h of the boiler water tank 4 1 ＝H t1 -H 01 And the like; according to the liquid level variation value, the existing boiler water tanks 4 can be known to be in the running state, and only h is assumed i If the variation value exists, the variation value indicates that only the ith boiler water tank 4 is in operation, so that the S7-200PLC or the single chip microcomputer controller controls the water pump 2 and the corresponding valves of the ith boiler water tank 4 to be openedCondensed water in the condensed water tank 1 is transferred to the ith boiler water tank 4 through a water return valve 3 and a water pump 2, and meanwhile, a production water pipe conveys production water to the ith boiler water tank 4 through a water supplementing valve 5; assuming that a plurality of boiler water tanks 4 are simultaneously operated, the S7-200PLC or the single chip microcomputer controller judges H t Of (1), if the minimum value is H ts If the water level of the S-th boiler water tank 4 in the water tanks which are operated simultaneously is the lowest, the S7-200PLC or the single chip microcomputer controller controls the water pump 2 and the corresponding valves of the S-th boiler water tank 4 to be opened, the condensed water in the condensed water tank 1 is transferred to the S-th boiler water tank 4 through the water return valve 3 and the water pump 2, and meanwhile, a production water pipe conveys production water to the S-th boiler water tank 4 through the water replenishing valve 5.
Stopping water return when the liquid level of the ith or s boiler water tank 4 rises to a high liquid level in the step 5, closing a water return valve 3 of the water tank, and repeating the steps 1 to 5 to select another water tank for water supplement and water return; if the ith or S boiler water tank 4 does not rise to the high liquid level but another low liquid level water tank appears, the S7-200PLC or the single chip microcomputer controller needs to reselect the water tank for water supplement and return according to the steps 1 to 5.
When the condensed water tank 1 is at a low liquid level, the water pump 2 is not triggered to act; when the condensed water tank 1 is at a middle liquid level, the S7-200PLC or the single chip microcomputer controller controls the water pump 2 to be opened; and when the condensed water tank 1 is at a high liquid level, the S7-200PLC or the single chip microcomputer controller controls the alarm device, and the alarm device gives an alarm. And forcibly stopping the water pump 2 when the condensed water tank 1 supplies water to a low liquid level, and repeatedly and circularly starting the water pump 2 when the liquid level of the condensed water tank 1 is raised to a medium liquid level again.
The production water pipe carries out the moisturizing operation in condensate tank 1 storage capacity not enough and 4 low liquid level states of boiler water tank, stops municipal water supply when reaching well liquid level with 4 moisturizing of boiler water tank.
When the boiler water tank 4 is at a high liquid level, the S7-200PLC or the single chip microcomputer controller controls the alarm device, the alarm device gives an alarm, and no water supply or return operation is carried out.
Claims (10)
1. A boiler multi-tank liquid level control system, comprising:
the water pump and correspond to the return valve of each boiler water tank separately, the input end of the said water pump is connected to the carry-out terminal of the condensed water tank, the carry-out terminal is connected to the input end of each return valve separately, the carry-out terminal is connected to the input end of the corresponding boiler water tank separately;
a plurality of liquid level sensors, which are respectively corresponding to the condensed water tank and each boiler water tank and are configured to measure the liquid level of the corresponding water tank;
a controller connected to the water pump, each water return valve, each water replenishment valve, and each liquid level sensor, respectively, configured to perform the steps of:
receiving data collected by each liquid level sensor;
respectively obtaining the liquid levels of each boiler water tank at the previous moment and the current moment, and obtaining the liquid level change value of each boiler water tank at the current moment compared with the previous moment;
judging whether each boiler water tank is in operation or not based on the liquid level change value of each boiler water tank at the current time compared with the previous time;
when only one boiler water tank is in operation, a water pump and a water return valve corresponding to the boiler water tank are started;
when a plurality of boiler water tanks are in operation, selecting the boiler water tank with the lowest liquid level at the current moment from all the boiler water tanks in operation, and starting a water pump and a water return valve corresponding to the boiler water tank.
2. The boiler multi-tank liquid level control system of claim 1, wherein the controller is configured to further perform the steps of: and judging whether the current water level of the condensed water tank is higher than the starting water level or not, and if not, locking the water pump to be in a closed state.
3. The system of claim 1, wherein the boiler water tanks are further connected to a water supply line by a water supply valve.
4. The system of claim 3, wherein when only one boiler water tank is in operation, the water pump and the water return valve corresponding to the boiler water tank are turned on, and the system comprises:
when only one boiler water tank is in operation, the liquid level of the boiler water tank at the current moment is judged:
if the liquid level of the boiler water tank at the current moment is lower than a first set threshold value, starting a water pump and a water return valve corresponding to the boiler water tank, starting a water replenishing valve corresponding to the boiler water tank, continuously monitoring the liquid level of the boiler water tank,
and if the liquid level of the boiler water tank exceeds a second set threshold value, starting a water pump and a water return valve corresponding to the boiler water tank.
5. The system of claim 3, wherein when there are a plurality of boiler water tanks in operation, selecting the boiler water tank with the lowest liquid level at the current time from all the boiler water tanks in operation, and turning on the water pump and the water return valve corresponding to the boiler water tank comprises:
when a plurality of boiler water tanks are in operation, selecting the boiler water tank with the lowest liquid level at the current moment from all the boiler water tanks in operation, and judging the liquid level of the boiler water tank at the current moment:
if the liquid level of the boiler water tank at the current moment is lower than a first set threshold value, starting a water pump and a water return valve corresponding to the boiler water tank, starting a water replenishing valve corresponding to the boiler water tank, continuously monitoring the liquid level of the boiler water tank,
and if the liquid level of the boiler water tank exceeds a second set threshold value, starting a water pump and a water return valve corresponding to the boiler water tank, and continuously monitoring the liquid level of the boiler water tank.
6. The system of claim 4 or 5, wherein the first and second set thresholds are equal.
7. The boiler multi-tank liquid level control system of claim 1, wherein the controller is configured to further perform the steps of: and when the vertical liquid level of any boiler exceeds a fourth set threshold value, sending an alarm signal to the outside.
8. The system of claim 1, wherein the liquid level sensor is a flap-type liquid level meter or a pressure-type liquid level meter.
9. The system of claim 1, wherein the controller is a PLC controller.
10. The system of claim 1, wherein the controller is a single-chip microcomputer.
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| CN202110078138.3A CN112859940B (en) | 2021-01-20 | 2021-01-20 | Multi-water-tank liquid level control system of boiler |
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| CN113776198A (en) * | 2021-09-22 | 2021-12-10 | 新奥数能科技有限公司 | Start-stop state control method and device for gas boiler heat supply unit |
| CN114000888A (en) * | 2021-11-24 | 2022-02-01 | 盾构及掘进技术国家重点实验室 | Intelligent water replenishing device for water circulation system of shield machine |
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