CN111233060B - Evaporator, vacuum degree, liquid level of evaporation kettle and water level detection control method of water tank - Google Patents
Evaporator, vacuum degree, liquid level of evaporation kettle and water level detection control method of water tank Download PDFInfo
- Publication number
- CN111233060B CN111233060B CN202010045507.4A CN202010045507A CN111233060B CN 111233060 B CN111233060 B CN 111233060B CN 202010045507 A CN202010045507 A CN 202010045507A CN 111233060 B CN111233060 B CN 111233060B
- Authority
- CN
- China
- Prior art keywords
- liquid
- liquid level
- plc
- circulating water
- evaporation kettle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 283
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 173
- 238000001704 evaporation Methods 0.000 title claims abstract description 95
- 230000008020 evaporation Effects 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 title description 5
- 239000002699 waste material Substances 0.000 claims abstract description 47
- 239000003507 refrigerant Substances 0.000 claims abstract description 34
- 230000001502 supplementing effect Effects 0.000 claims abstract description 18
- 239000011550 stock solution Substances 0.000 claims abstract description 6
- 238000001816 cooling Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 11
- 239000007789 gas Substances 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000004912 1,5-cyclooctadiene Substances 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000012946 outsourcing Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/005—Processes using a programmable logic controller [PLC]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/03—Pressure
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/42—Liquid level
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/06—Pressure conditions
- C02F2301/063—Underpressure, vacuum
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to an evaporator, a control method for detecting vacuum degree, liquid level of an evaporation kettle and water level of a water tank. The method comprises the following steps: starting a system; detecting the liquid level of the waste liquid barrel; detecting whether the liquid level is low, if so, controlling to close the circulating water pump and open the emptying valve by the PLC; if not, the PLC controls to start the circulating water pump and open the liquid inlet valve, and the circulating water pump operates to change the inside of the evaporation kettle into negative pressure; judging whether the vacuum degree is greater than a set value, if so, starting the compressor, starting the circulation of the refrigerant, and if not, returning; sucking the stock solution into the evaporation kettle through a liquid inlet valve under negative pressure, and detecting the liquid level of the evaporation kettle by a sensor; if the liquid level is higher than the high liquid level, the PLC in the evaporation kettle controls the liquid inlet valve to be closed; if the liquid level is lower than the low liquid level, the PLC judges whether the liquid supplementing times is larger than a set value, if not, the PLC controls to open the liquid inlet valve to return, if so, the PLC controls to open the emptying valve and the liquid discharge valve, open the liquid discharge pump, close the compressor and the circulating water pump, wait for the set time, discharge the concentrated liquid, close the emptying valve, the liquid discharge valve and the liquid discharge pump, and return.
Description
Technical Field
The invention relates to the technical field of waste liquid treatment, in particular to a control method for detecting the vacuum degree of an evaporator and a vacuum gauge, detecting the liquid level of an evaporation kettle and detecting the water level in a water tank.
Background
The industries such as PCB, electroplating and the like can generate waste liquid in the production process, the main pollution components mainly comprise COD, nitrogen, phosphorus and heavy metals, and if the waste liquid is directly discharged without treatment, the waste liquid can seriously pollute the environment and harm the human health. The waste liquid has the characteristics of multiple pollutant types, high concentration, small amount and dispersive distribution. Common treatment methods include chemical methods, membrane separation methods, evaporation methods, and the like. At present, most enterprises dispose waste liquid by outsourcing, and the problems of high disposal cost, untimely transfer, overstocked storage, influence on normal production of the enterprises and the like exist.
In the prior art, there are processes for treating such waste streams using evaporation techniques. After the waste liquid is evaporated and concentrated, the cost of external treatment is greatly reduced, and after the waste liquid is evaporated and concentrated, the water content is reduced, the heat value is high, and the subsequent further treatment of the waste liquid, such as drying, solidification, incineration and the like, is facilitated.
The evaporation method can be divided into high-temperature steam evaporation, electric heating evaporation, combined cold and heat supply heat pump evaporation and the like from a heat source.
The high-temperature steam evaporation has the phenomenon of high-temperature decomposition of waste liquid and produces waste gas, thereby having potential safety hazard. In addition, the method needs high-temperature steam, additional steam production equipment is needed if no steam exists on site, and the energy consumption is higher.
The electric heating evaporation is to heat the heat-conducting oil by electric energy, then the heat-conducting oil enters a jacket of the reaction kettle and is subjected to heat price exchange with the liquid in the reaction kettle, so that the liquid is heated and evaporated. However, the efficiency of converting electric energy into heat energy is low, the heat exchange efficiency between the heat-conducting oil and liquid in the reaction kettle is low, the energy consumption is high, and additional refrigeration equipment is needed for condensing steam.
CN201820892924.0 discloses a waste water evaporation concentration processing system, and its purpose is to provide a system that has low drug consumption, low processing cost, stable processing effect, and meets the waste water discharge standard. The technical scheme is as follows: waste water evaporative concentration processing system, including high temperature water source heat pump set, condenser, vacuum pump and evaporative concentration device, be equipped with hot water output tube, hot water input tube, cold water output tube and cold water input tube on the high temperature water source heat pump set, the hot water output tube with evaporative concentration device's water inlet is connected, the hot water input tube with evaporative concentration device's delivery port is connected, the cold water output tube with the water inlet of condenser is connected, the cold water input tube with the delivery port of condenser is connected, the vacuum pump respectively with condenser and evaporative concentration device intercommunication. The system has the following disadvantages: the evaporated non-condensable gas is discharged through a vacuum pump, and waste gas is discharged to the outside; when the condensed water is discharged, the equipment needs to be vacuumized, and power equipment is additionally arranged to pump out the condensed water, so that the waste water cannot be continuously evaporated, and the treatment efficiency is low; and thirdly, in order to avoid the overheat shutdown of the vacuum pump, additional refrigeration equipment is required to be additionally arranged to cool the vacuum pump, so that the equipment investment and the energy consumption are increased.
Disclosure of Invention
The invention aims to provide a control method for automatically controlling an evaporator by a PLC (programmable logic controller), a control method for detecting vacuum degree and a control method for detecting liquid level of an evaporation kettle. The invention solves another technical problem by providing a control method for automatically controlling the detection of the water level in the circulating water tank by the PLC.
The technical scheme of the invention is the control method of the evaporator, which is characterized by comprising the following steps:
firstly, electrifying and starting a system;
the liquid level of the waste liquid barrel is detected by a first liquid level sensor;
the third step of detecting whether the liquid level is low or not, if so, sending a signal to the PLC by the first liquid level sensor, and controlling to close the circulating water pump and open the emptying valve by the PLC and returning to the second step;
if not, the PLC controls to start the circulating water pump, opens the liquid inlet valve, and the circulating water pump operates to continuously pump out air in the evaporation kettle, so that negative pressure is formed in the evaporation kettle;
fifthly, detecting the vacuum degree by a vacuum gauge;
sixthly, judging whether the vacuum degree is larger than a set value or not, if so, transmitting a signal to a PLC (programmable logic controller), controlling the start of a compressor by the PLC, and enabling a refrigerant to start circulation;
step four of receiving, sucking stock solution into the evaporation kettle through a liquid inlet valve under negative pressure, and detecting the liquid level of the evaporation kettle by a second liquid level sensor;
and judging whether the liquid level in the evaporation kettle is higher than the high liquid level or not, if so, sending a signal to a PLC (programmable logic controller) by a second liquid level sensor in the evaporation kettle, closing a liquid inlet valve by the PLC, counting the liquid supplementing times and returning to the step S;
the self-lifting judgment is carried out on whether the liquid level in the evaporation kettle is lower than the low liquid level or not, if so, a second liquid level sensor in the evaporation kettle sends a signal to a PLC (programmable logic controller), the PLC judges whether the liquid supplementing times are larger than a set value or not, if not, the PLC controls to open a liquid inlet valve and returns to the step S;
and fourthly, if the liquid supplementing times are larger than a set value, the PLC controls to open the emptying valve and the liquid discharge valve, open the liquid discharge pump, close the compressor and the circulating water pump, wait for the set time, discharge the concentrated liquid, close the emptying valve, the liquid discharge valve and the liquid discharge pump, and return to the fourth step.
Preferably, the method comprises the following steps: step four, detecting the water level in the circulating water tank by a third liquid level sensor, judging whether the water level is higher than a set high water level, if so, sending a signal to a PLC (programmable logic controller) by the third liquid level sensor in the circulating water tank, and controlling to open a drain valve by the PLC to drain water outwards; and the third liquid level sensor continuously detects the water level in the circulating water tank and judges whether the water level is lower than the set low water level, if so, the third liquid level sensor in the circulating water tank sends a signal to the PLC, and the PLC controls the closing of the drain valve.
Preferably, the method comprises the following steps: sixthly, a pressure gauge is arranged on the refrigerant high-pressure section, the pressure gauge detects whether the pressure of the refrigerant in the high-pressure section is larger than a set value A, if yes, the pressure gauge transmits a signal to a PLC, the PLC controls a starting fan to radiate heat to the outside, and the pressure value is reduced; and the pressure gauge continuously detects whether the pressure of the refrigerant in the high-pressure section is less than a set value B, if so, the pressure gauge transmits a signal to the PLC, and the PLC controls the fan to be turned off.
The invention also provides a control method for detecting the vacuum degree of the evaporator vacuum gauge, which is characterized by comprising the following steps of:
firstly, electrifying and starting a system;
the liquid level of the waste liquid barrel is detected by a first liquid level sensor;
the third step of detecting whether the liquid level is low or not, if so, sending a signal to the PLC by the first liquid level sensor, and controlling to close the circulating water pump and open the emptying valve by the PLC and returning to the second step;
if not, the PLC controls to start the circulating water pump, opens the liquid inlet valve, and the circulating water pump operates to continuously pump out air in the evaporation kettle, so that negative pressure is formed in the evaporation kettle;
fifthly, detecting the vacuum degree by a vacuum gauge;
sixthly, judging whether the vacuum degree is larger than a set value or not, if so, transmitting a signal to a PLC (programmable logic controller), controlling the start of a compressor by the PLC, and enabling a refrigerant to start circulation;
the invention also provides a technical scheme that the control method for detecting the liquid level of the evaporator evaporation kettle is characterized by comprising the following steps:
firstly, electrifying and starting a system;
the liquid level of the waste liquid barrel is detected by a first liquid level sensor;
the third step of detecting whether the liquid level is low or not, if so, sending a signal to the PLC by the first liquid level sensor, and controlling to close the circulating water pump and open the emptying valve by the PLC and returning to the second step;
if not, the PLC controls to start the circulating water pump, opens the liquid inlet valve, and the circulating water pump operates to continuously pump out air in the evaporation kettle, so that negative pressure is formed in the evaporation kettle;
fifthly, sucking the stock solution into the evaporation kettle through the liquid inlet valve by the negative pressure, and detecting the liquid level of the evaporation kettle by the second liquid level sensor;
sixthly, judging whether the liquid level in the evaporation kettle is higher than a high liquid level, if so, sending a signal to a PLC (programmable logic controller) by a second liquid level sensor in the evaporation kettle, controlling to close a liquid inlet valve by the PLC, and returning to the step fifthly after the liquid supplementing times are counted;
judging whether the liquid level in the evaporation kettle is lower than the low liquid level, if so, sending a signal to a PLC (programmable logic controller) by a second liquid level sensor in the evaporation kettle, judging whether the liquid supplementing times are larger than a set value by the PLC, if not, controlling to open a liquid inlet valve by the PLC, and returning to the step;
and if the liquid supplementing times are larger than the set value, the PLC controls to open the emptying valve and the liquid discharging valve, open the liquid discharging pump, close the compressor and the circulating water pump, discharge the concentrated liquid after waiting for the set time, close the emptying valve, the liquid discharging valve and the liquid discharging pump, and return to the fourth step.
The last technical solution of the present invention is a control method for detecting the water level in the circulating water tank of the evaporator, which is characterized by comprising the following steps:
firstly, electrifying and starting a system;
the liquid level of the waste liquid barrel is detected by a first liquid level sensor;
the third step of detecting whether the liquid level is low or not, if so, sending a signal to the PLC by the first liquid level sensor, and controlling to close the circulating water pump and open the emptying valve by the PLC and returning to the second step;
if not, the PLC controls to start the circulating water pump, opens the liquid inlet valve, and the circulating water pump operates to continuously pump out air in the evaporation kettle, so that negative pressure is formed in the evaporation kettle;
fifthly, detecting the water level in the circulating water tank by a third liquid level sensor, judging whether the water level is higher than a set high water level, if so, sending a signal to a PLC (programmable logic controller) by the third liquid level sensor in the circulating water tank, and controlling to open a drain valve by the PLC to drain water outwards;
sixthly, the third liquid level sensor continuously detects the water level in the circulating water tank and judges whether the water level is lower than a set low water level or not, if so, the third liquid level sensor in the circulating water tank sends a signal to the PLC, and the PLC controls the closing of a drain valve.
The invention has the beneficial effects that:
the liquid level sensor of the waste liquid bucket is started and closed according to the automatic liquid level control equipment, the liquid level sensor of the evaporation kettle automatically controls liquid feeding, and the automation degree of the equipment is improved.
When the temperature of the equipment is increased, the pressure of a high-pressure section of the refrigerant is also increased, and when the temperature is higher than a set value, the fan is opened to radiate heat to the outside, so that the equipment is protected.
According to the invention, different liquid supplementing and concentrating times can be set according to the types, properties and concentrations of different waste liquids, so that the concentrating effect is improved.
The liquid level sensor of the circulating water tank automatically controls the drain valve to be opened and closed according to the liquid level, and when the water level is higher than a high water level, condensed water is discharged in time; when the water level is lower than the low liquid level, the water discharge is stopped, and the idle damage of the circulating water pump caused by too low liquid level is prevented.
When the circulating water pump is shut down, the emptying valve is opened to discharge vacuum, and condensate water is prevented from being sucked backwards.
Sixthly, the PLC is adopted to control the automation degree to be high, and the operation is simple.
The waste liquid in the invention is vaporized and evaporated at low temperature, the material property does not change chemically, and no potential safety hazard exists; the concentration of the condensate pollutants is low, and the in-situ harmless treatment is realized.
And the efficiency of converting electric energy into heat energy is high and is 4-5 times of the direct conversion efficiency of electric heat.
The self-supporting liquid waste evaporation and condensation process and the compressor heat dissipation and refrigeration process are in seamless butt joint, a heat source and a cold source are integrally supplied, external cold and hot auxiliary equipment is not needed, and the energy utilization efficiency is high.
The invention adopts the fluid jet technology to provide the system low-pressure environment, has high vacuum degree, can synchronously discharge condensate and noncondensable gas, and has simple structure and no waste gas discharge.
The evaporator can continuously evaporate the waste liquid while discharging the condensate, and the waste liquid treatment efficiency is high. The invention has high automation degree, simple operation and convenient use.
Drawings
FIG. 1 is a control flow diagram of an evaporator of the present invention;
fig. 2 is a schematic view of the structure of the evaporator of the present invention.
Description of the main component symbols:
waste liquid barrel 1, first liquid level sensor 11, cold-hot combined supply system 2, liquid inlet valve 21
Second liquid level sensor 222 vacuum gauge 223 emptying valve 224 of evaporation kettle 22
Circulating water pump 33 with third coil 321, third liquid level sensor 322 of circulating water tank 32
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings:
referring to fig. 1, the method for controlling the evaporator includes the following steps:
firstly, electrifying and starting a system;
the liquid level of the waste liquid barrel is detected by a first liquid level sensor;
the third step of detecting whether the liquid level is low or not, if so, sending a signal to the PLC by the first liquid level sensor, and controlling to close the circulating water pump and open the emptying valve by the PLC and returning to the second step;
if not, the PLC controls to start the circulating water pump, opens the liquid inlet valve, and the circulating water pump operates to continuously pump out air in the evaporation kettle, so that negative pressure is formed in the evaporation kettle;
(4.1) detecting the water level in the circulating water tank by using a third liquid level sensor;
(4.2) judging whether the water level is higher than a set high water level, if so, sending a signal to a PLC (programmable logic controller) by a third liquid level sensor in the circulating water tank, and controlling to open a drain valve and drain water outwards by the PLC;
(4.3) continuously detecting the water level in the circulating water tank by using a third liquid level sensor, judging whether the water level is lower than the set low water level, if so, sending a signal to a PLC (programmable logic controller) by using the third liquid level sensor in the circulating water tank, and controlling to close a drain valve by the PLC;
fifthly, detecting the vacuum degree by a vacuum gauge;
sixthly, judging whether the vacuum degree is larger than a set value or not, if so, transmitting a signal to a PLC (programmable logic controller), controlling the start of a compressor by the PLC, and enabling a refrigerant to start circulation;
(6.1) a pressure gauge is arranged at the refrigerant high-pressure section, the pressure gauge detects whether the refrigerant pressure at the high-pressure section is greater than a set value A, if so, the pressure gauge transmits a signal to a PLC, the PLC controls a starting fan to radiate heat to the outside, and the pressure value is reduced;
(6.2) the pressure gauge continuously detects whether the pressure of the refrigerant in the high-pressure section is smaller than a set value B, if so, the pressure gauge transmits a signal to the PLC, and the PLC controls the fan to be turned off;
step four of receiving, sucking stock solution into the evaporation kettle through a liquid inlet valve under negative pressure, and detecting the liquid level of the evaporation kettle by a second liquid level sensor;
and judging whether the liquid level in the evaporation kettle is higher than the high liquid level or not, if so, sending a signal to a PLC (programmable logic controller) by a second liquid level sensor in the evaporation kettle, closing a liquid inlet valve by the PLC, counting the liquid supplementing times and returning to the step S;
the self-lifting judgment is carried out on whether the liquid level in the evaporation kettle is lower than the low liquid level or not, if so, a second liquid level sensor in the evaporation kettle sends a signal to a PLC (programmable logic controller), the PLC judges whether the liquid supplementing times are larger than a set value or not, if not, the PLC controls to open a liquid inlet valve and returns to the step S;
and fourthly, if the liquid supplementing times are larger than a set value, the PLC controls to open the emptying valve and the liquid discharge valve, open the liquid discharge pump, close the compressor and the circulating water pump, wait for the set time, discharge the concentrated liquid, close the emptying valve, the liquid discharge valve and the liquid discharge pump, and return to the fourth step.
Referring to fig. 1, the method for controlling the vacuum degree detected by the evaporator vacuum gauge includes the following steps:
firstly, electrifying and starting a system;
the liquid level of the waste liquid barrel is detected by a first liquid level sensor;
the third step of detecting whether the liquid level is low or not, if so, sending a signal to the PLC by the first liquid level sensor, and controlling to close the circulating water pump and open the emptying valve by the PLC and returning to the second step;
if not, the PLC controls to start the circulating water pump, opens the liquid inlet valve, and the circulating water pump operates to continuously pump out air in the evaporation kettle, so that negative pressure is formed in the evaporation kettle;
fifthly, detecting the vacuum degree by a vacuum gauge;
sixthly, judging whether the vacuum degree is larger than a set value or not, if so, transmitting a signal to a PLC (programmable logic controller), controlling the start of a compressor by the PLC, and enabling a refrigerant to start circulation;
the refrigerant high-pressure section is provided with a pressure gauge,
the pressure gauge detects whether the pressure of the refrigerant in the high-pressure section is greater than a set value A, if so, the pressure gauge transmits a signal to the PLC, the PLC controls the starting of the fan to dissipate heat to the outside, and the pressure value is reduced;
the self-supporting pressure gauge continues to detect whether the pressure of the refrigerant in the high-pressure section is smaller than a set value B, if so, the pressure gauge transmits a signal to the PLC, and the PLC controls the fan to be turned off.
Referring to fig. 1, the method for controlling the liquid level detection of the evaporator includes the following steps:
firstly, electrifying and starting a system;
the liquid level of the waste liquid barrel is detected by a first liquid level sensor;
the third step of detecting whether the liquid level is low or not, if so, sending a signal to the PLC by the first liquid level sensor, and controlling to close the circulating water pump and open the emptying valve by the PLC and returning to the second step;
if not, the PLC controls to start the circulating water pump, opens the liquid inlet valve, and the circulating water pump operates to continuously pump out air in the evaporation kettle, so that negative pressure is formed in the evaporation kettle;
fifthly, sucking the stock solution into the evaporation kettle through the liquid inlet valve by the negative pressure, and detecting the liquid level of the evaporation kettle by the second liquid level sensor;
sixthly, judging whether the liquid level in the evaporation kettle is higher than a high liquid level, if so, sending a signal to a PLC (programmable logic controller) by a second liquid level sensor in the evaporation kettle, controlling to close a liquid inlet valve by the PLC, and returning to the step fifthly after counting liquid supplementing times;
judging whether the liquid level in the evaporation kettle is lower than the low liquid level, if so, sending a signal to a PLC (programmable logic controller) by a second liquid level sensor in the evaporation kettle, judging whether the liquid supplementing times are larger than a set value by the PLC, if not, controlling to open a liquid inlet valve by the PLC, and returning to the step;
and if the liquid supplementing times are larger than the set value, the PLC controls to open the emptying valve and the liquid discharging valve, open the liquid discharging pump, close the compressor and the circulating water pump, discharge the concentrated liquid after waiting for the set time, close the emptying valve, the liquid discharging valve and the liquid discharging pump, and return to the fourth step.
Referring to fig. 1, the method for controlling the detection of the water level in the evaporator circulation tank includes the following steps:
firstly, electrifying and starting a system;
the liquid level of the waste liquid barrel is detected by a first liquid level sensor;
the third step of detecting whether the liquid level is low or not, if so, sending a signal to the PLC by the first liquid level sensor, and controlling to close the circulating water pump and open the emptying valve by the PLC and returning to the second step;
if not, the PLC controls to start the circulating water pump, opens the liquid inlet valve, and the circulating water pump operates to continuously pump out air in the evaporation kettle, so that negative pressure is formed in the evaporation kettle;
fifthly, detecting the water level in the circulating water tank by a third liquid level sensor, judging whether the water level is higher than a set high water level, if so, sending a signal to a PLC (programmable logic controller) by the third liquid level sensor in the circulating water tank, and controlling to open a drain valve by the PLC to drain water outwards;
sixthly, the third liquid level sensor continuously detects the water level in the circulating water tank and judges whether the water level is lower than a set low water level or not, if so, the third liquid level sensor in the circulating water tank sends a signal to the PLC, and the PLC controls the closing of a drain valve.
Referring to fig. 2, the evaporator includes a waste liquid tank 1, a combined cooling and heating system 2, and a vacuum generator 3. The waste liquid barrel 1 is provided with a first liquid level sensor 11, the combined cooling and heating system 2 comprises an evaporation kettle 22, a condenser 23, a compressor 24, a radiator 25 and an expansion valve 26, a first coil pipe 221 is arranged in the evaporation kettle 22, the evaporation kettle 22 is respectively provided with a second liquid level sensor 222, a vacuum gauge 223, an emptying valve 224, a liquid inlet valve 21 connected with the waste liquid barrel 1 and a liquid outlet valve 27 connected with a liquid outlet pump 28, and a second coil pipe 231 is arranged in the condenser 23; vacuum generator 3 includes sprayer 31, circulating water tank 32, circulating water pump 33 that the pipeline connects gradually, be equipped with third coil pipe 321 in the circulating water tank 32, circulating water pump 33 with be equipped with drain valve 34 on the connecting pipeline of sprayer 31, circulating water tank 32 still is equipped with third level sensor 322, and the refrigerant in the circulating water tank 32 connects gradually compressor 27 and pressure gauge 29 back through the pipeline and inserts the first coil pipe 221 in the reation kettle 22, and first coil pipe 221 connects gradually the second coil pipe 231 in radiator 25, expansion valve 26 and the condenser 23 through the pipeline, and second coil pipe 231 inserts the third coil pipe 321 in the circulating water tank 32, and third coil pipe 321 connects compressor 24.
Referring to fig. 2, when the waste liquid in the waste liquid barrel 1 is at a high liquid level, the waste liquid enters the evaporation kettle 22 through the liquid inlet valve 21 arranged in the pipeline, because the boiling point of the vacuum waste liquid is low (30-40 ℃), the waste liquid is heated to the boiling point in the evaporation kettle 22, the waste liquid is evaporated and concentrated, and after the set number of times, the liquid discharge valve 27 is opened, and the concentrated liquid is discharged through the liquid discharge pump 28; the steam enters the condenser 23 through the steam pipeline, and in the condenser 23, the steam exchanges heat with the second coil 231 to release heat, is condensed into water, and is pumped into the ejector 31; then enters the circulating water tank 32, the condensate in the circulating water tank 32 is pressurized by the circulating water pump 33 and then returns to the circulating water tank 32 again through the ejector 33, and the condensate circulates in the vacuum generator 3 to generate a large amount of heat; when the water level in the circulation water tank 32 is at a high level, the drain valve 34 is opened, condensate is discharged, and power is supplied by the circulation water pump 33.
The compressor 24, the first coil 221, the radiator 25, the expansion valve 26, the second coil 231, and the third coil 321 are sequentially connected by a pipeline, and the third coil 321 is further connected with the compressor 24 by a pipeline to form a closed circulating connection pipeline; the refrigerant is in the pipeline, the compressor 24 provides power, and the refrigerant forms a closed cycle; after being compressed by the compressor 24, the refrigerant raises the pressure and generates a large amount of heat to become high-temperature and high-pressure gas, and the heat exchange is carried out between the first coil pipe 221 in the evaporation kettle 22 and the waste liquid outside the evaporation kettle to release the heat; the refrigerant enters the radiator 25 after passing through the evaporation kettle 22, the refrigerant coming out of the radiator 25 is in a medium-temperature high-pressure gas-liquid mixed state at this time and reaches the expansion valve 26, the expansion valve 26 has the functions of throttling and pressure reduction, the refrigerant becomes a low-temperature low-pressure fog state through the expansion valve 26 and enters the second coil 231 in the condenser 23, the refrigerant in the second coil 231 exchanges heat with steam outside the pipe, the refrigerant absorbs heat and is evaporated to become low-temperature low-pressure gas, the low-temperature low-pressure gas enters the third coil 321 in the circulating water tank 32, the refrigerant exchanges heat with water outside the pipe, the temperature of the water in the circulating water tank is reduced, the temperature of the refrigerant is increased, and the refrigerant enters the compressor 24 again and is compressed.
The radiator 25 is provided with a fan 251, when the pressure of the high-pressure section of the refrigerant is too high, the fan 251 is turned on to radiate heat to the outside, the pressure is reduced, and when the pressure is lower than a set value, the fan 251 is turned off.
The high-pressure water in the ejector 31 forms high-speed jet flow through the nozzle, partial vacuum is formed at the outlet of the nozzle, air and condensate are pumped out, the water-vapor mixed liquid enters the circulating water tank 32, and air in the evaporation kettle 22 and the connected pipeline is pumped out, so that the vacuum environment of the system is generated.
When the liquid level of the evaporation kettle 22 is at a low liquid level, the liquid inlet valve 21 is opened, waste liquid is pumped into the evaporation kettle 22 due to negative pressure, and when the liquid level of the evaporation kettle 22 is at a high liquid level, the liquid inlet valve 21 is closed; the evaporation kettle 22 is provided with an emptying valve 224, when the equipment is shut down, the emptying valve 224 is opened, so that condensate is prevented from being sucked back due to vacuum, and the equipment is protected; the bottom of the evaporation kettle 22 is connected with a liquid discharge valve 27 through a pipeline, the liquid discharge valve 27 is connected with a liquid discharge pump 28 through a pipeline, when waste liquid is concentrated to a certain degree, the emptying valve 224 is opened, then the liquid discharge valve 27 is opened, the liquid discharge pump 28 is opened, and concentrated liquid is discharged.
A water discharge valve 34 is arranged on a connecting pipeline of the circulating water pump 32 and the ejector 33, when the water level in the circulating water tank 32 is at a high water level, the water discharge valve 34 is opened, condensate is discharged, and power is provided by the circulating water pump 32.
Referring to fig. 2, the evaporation method of the evaporator includes the following steps:
(1) after the equipment is started, the first liquid level sensor 11 senses that the liquid level of the waste liquid barrel 1 is higher than a set value, and the circulating water pump 33 is started;
(2) the condensate in the circulating water tank 32 is pressurized by the circulating water pump 33 and then returns to the circulating water tank 32 again through the ejector 31, high-pressure water forms high-speed jet flow in the ejector 31, air in the evaporation kettle 1 and the connected pipeline is pumped out, and a low-pressure environment is formed in the evaporation kettle 22;
(3) when the vacuum degree in the evaporation kettle 22 reaches a set vacuum degree, the compressor 24 is started, and the refrigerant forms a closed cycle;
(4) the waste liquid in the waste liquid barrel 1 enters an evaporation kettle 22 through a liquid inlet valve 21 arranged in a pipeline under low pressure, and the waste liquid is heated to a boiling point in the evaporation kettle 22 by heat absorption due to high vacuum degree and low boiling point (30-40 ℃), and is evaporated and concentrated;
(5) the steam enters the condenser 23 through the steam pipeline, and in the condenser 23, the steam exchanges heat with the second coil 231 to release heat, is condensed into water, is pumped into the ejector 31, and enters the circulating water tank 32;
(6) when the number of times of liquid supplementing and concentrating of the waste liquid in the evaporation kettle reaches a set value, the emptying valve 224 is opened, then the liquid discharging valve 27 is opened, the liquid discharging pump 28 is opened, and the concentrated liquid is discharged.
The above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (3)
1. The control method of the evaporator is characterized in that the evaporator comprises a waste liquid barrel, a combined cooling and heating system and a vacuum generator; the waste liquid barrel is provided with a first liquid level sensor, the cold and hot combined supply system comprises an evaporation kettle, a condenser, a compressor, a radiator and an expansion valve, a first coil pipe is arranged in the evaporation kettle, the evaporation kettle is respectively provided with a second liquid level sensor, a vacuum gauge, an emptying valve, a liquid inlet valve connected with the waste liquid barrel and a liquid discharge valve connected with a liquid discharge pump, and a second coil pipe is arranged in the condenser; the vacuum generator comprises an ejector, a circulating water tank and a circulating water pump which are sequentially connected through a pipeline, a third coil pipe is arranged in the circulating water tank, a drain valve is arranged on a connecting pipeline of the circulating water pump and the ejector, the circulating water tank is also provided with a third liquid level sensor, a refrigerant in the circulating water tank is sequentially connected with a compressor and a pressure gauge through pipelines and then is connected to a first coil pipe in an evaporation kettle, the first coil pipe is sequentially connected with a radiator, an expansion valve and a second coil pipe in a condenser through pipelines, the second coil pipe is connected to the third coil pipe in the circulating water tank, and the third coil pipe is connected with the compressor; the control method comprises the following steps:
firstly, electrifying and starting a system;
the liquid level of the waste liquid barrel is detected by a first liquid level sensor;
the third step of detecting whether the liquid level is low or not, if so, sending a signal to the PLC by the first liquid level sensor, and controlling to close the circulating water pump and open the emptying valve by the PLC and returning to the second step;
if not, the PLC controls to start the circulating water pump, opens the liquid inlet valve, and the circulating water pump operates to continuously pump out air in the evaporation kettle, so that negative pressure is formed in the evaporation kettle;
fifthly, detecting the vacuum degree by a vacuum gauge;
sixthly, judging whether the vacuum degree is larger than a set value or not, if yes, transmitting a signal to a PLC by a vacuum gauge, starting a compressor under the control of the PLC, and circulating a refrigerant, otherwise, returning to the step fifthly;
step four of receiving, sucking stock solution into the evaporation kettle through a liquid inlet valve under negative pressure, and detecting the liquid level of the evaporation kettle by a second liquid level sensor;
and judging whether the liquid level in the evaporation kettle is higher than the high liquid level or not, if so, sending a signal to a PLC (programmable logic controller) by a second liquid level sensor in the evaporation kettle, closing a liquid inlet valve by the PLC, counting the liquid supplementing times and returning to the step S;
the self-lifting judgment is carried out on whether the liquid level in the evaporation kettle is lower than the low liquid level or not, if so, a second liquid level sensor in the evaporation kettle sends a signal to a PLC (programmable logic controller), the PLC judges whether the liquid supplementing times are larger than a set value or not, if not, the PLC controls to open a liquid inlet valve and returns to the step S;
and fourthly, if the liquid supplementing times are larger than a set value, the PLC controls to open the emptying valve and the liquid discharge valve, open the liquid discharge pump, close the compressor and the circulating water pump, wait for the set time, discharge the concentrated liquid, close the emptying valve, the liquid discharge valve and the liquid discharge pump, and return to the fourth step.
2. The method for controlling the evaporator according to claim 1, wherein the fourth step is carried out, the third liquid level sensor detects the water level in the circulating water tank, whether the water level is higher than the set high water level is judged, if yes, the third liquid level sensor in the circulating water tank sends a signal to the PLC, and the PLC controls the opening of the drain valve to drain water outwards; and the third liquid level sensor continuously detects the water level in the circulating water tank and judges whether the water level is lower than the set low water level, if so, the third liquid level sensor in the circulating water tank sends a signal to the PLC, and the PLC controls the closing of the drain valve.
3. The evaporator control method according to claim 1, characterized by receiving the sixteenth step, wherein a pressure gauge is arranged on the high-pressure section of the refrigerant, the pressure gauge detects whether the pressure of the refrigerant in the high-pressure section is greater than a set value A, if so, the pressure gauge transmits a signal to a PLC, the PLC controls a starting fan to dissipate heat to the outside, and the pressure value is reduced; and the pressure gauge continuously detects whether the pressure of the refrigerant in the high-pressure section is less than a set value B, if so, the pressure gauge transmits a signal to the PLC, and the PLC controls the fan to be turned off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010045507.4A CN111233060B (en) | 2020-01-16 | 2020-01-16 | Evaporator, vacuum degree, liquid level of evaporation kettle and water level detection control method of water tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010045507.4A CN111233060B (en) | 2020-01-16 | 2020-01-16 | Evaporator, vacuum degree, liquid level of evaporation kettle and water level detection control method of water tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111233060A CN111233060A (en) | 2020-06-05 |
| CN111233060B true CN111233060B (en) | 2022-05-03 |
Family
ID=70876181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010045507.4A Active CN111233060B (en) | 2020-01-16 | 2020-01-16 | Evaporator, vacuum degree, liquid level of evaporation kettle and water level detection control method of water tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111233060B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112408529A (en) * | 2020-12-15 | 2021-02-26 | 广州凯能电器科技有限公司 | Waste liquid treatment system and method |
| CN113963832B (en) * | 2021-11-30 | 2023-10-27 | 中国原子能科学研究院 | Heat pump evaporation treatment system and method for radioactive waste liquid treatment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0337455A1 (en) * | 1988-04-14 | 1989-10-18 | Arkay Corporation Of Wisconsin | Device and method for reducing volume of aqueous waste effluents |
| CN105536274A (en) * | 2015-12-11 | 2016-05-04 | 苏州泽达兴邦医药科技有限公司 | Control method for double-effect concentration process of Chinese traditional medicines |
| CN105664516A (en) * | 2016-01-25 | 2016-06-15 | 李庆喜 | Device and method for controlling liquid treatment device |
| CN105879420A (en) * | 2016-05-25 | 2016-08-24 | 江苏康缘药业股份有限公司 | Temperature and vacuum degree stable control method and equipment of concentration process of honeysuckle and artemisia apiacea extract |
| CN107918345A (en) * | 2016-10-08 | 2018-04-17 | 航天晨光股份有限公司 | A kind of nuclear power MVR automation control systems and its control method |
| CN208406114U (en) * | 2018-05-14 | 2019-01-22 | 浙江天甘科技有限公司 | A kind of Chinese medicine production single-action concentration automatic control device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8273156B2 (en) * | 2008-07-01 | 2012-09-25 | Eric John Dole | Method and apparatus for water distillation and recovery |
-
2020
- 2020-01-16 CN CN202010045507.4A patent/CN111233060B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0337455A1 (en) * | 1988-04-14 | 1989-10-18 | Arkay Corporation Of Wisconsin | Device and method for reducing volume of aqueous waste effluents |
| CN105536274A (en) * | 2015-12-11 | 2016-05-04 | 苏州泽达兴邦医药科技有限公司 | Control method for double-effect concentration process of Chinese traditional medicines |
| CN105664516A (en) * | 2016-01-25 | 2016-06-15 | 李庆喜 | Device and method for controlling liquid treatment device |
| CN105879420A (en) * | 2016-05-25 | 2016-08-24 | 江苏康缘药业股份有限公司 | Temperature and vacuum degree stable control method and equipment of concentration process of honeysuckle and artemisia apiacea extract |
| CN107918345A (en) * | 2016-10-08 | 2018-04-17 | 航天晨光股份有限公司 | A kind of nuclear power MVR automation control systems and its control method |
| CN208406114U (en) * | 2018-05-14 | 2019-01-22 | 浙江天甘科技有限公司 | A kind of Chinese medicine production single-action concentration automatic control device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111233060A (en) | 2020-06-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111252835A (en) | Waste liquid evaporation treatment method and heating and refrigerating method in waste liquid evaporation process | |
| CN111156154A (en) | Evaporator, combined cooling and heating system, vacuum generator | |
| CN207279602U (en) | A kind of closed type condensate water recovery device | |
| CN101806445B (en) | Trough type solar multistage heat utilization device | |
| CN216755399U (en) | Low-temperature vacuum evaporator | |
| CN112408529A (en) | Waste liquid treatment system and method | |
| CN211598956U (en) | Evaporator, combined cooling and heating system and vacuum generator | |
| CN111233060A (en) | Evaporator, vacuum degree, liquid level of evaporation kettle and water level detection control method of water tank | |
| CN215939038U (en) | Wheat starch water MVR evaporation concentration device | |
| CN114543075A (en) | Industrial flash steam heating and boosting efficient recovery circulation system and recovery method | |
| CN213977034U (en) | Waste liquid treatment system | |
| CN210751315U (en) | Air source multiple-effect vacuum evaporation system applied to cutting fluid concentration | |
| CN105042892A (en) | Hot water system combined with slot type solar thermal collector | |
| CN210601824U (en) | Waste heat recovery system of range hood | |
| CN219751962U (en) | Explosive waste liquid enrichment facility | |
| CN206989173U (en) | A kind of energy-saving flash vessel disappears white system | |
| CN118005123A (en) | A multi-effect heat exchange vacuum evaporator | |
| CN214512755U (en) | Heat pump double-effect evaporation concentration system with low-level heat discarding balance | |
| CN211676329U (en) | Heat pump system and evaporation concentration system with same | |
| CN205014677U (en) | Take pressurization installation's exhaust steam waste heat step recycle system | |
| CN211885408U (en) | Heat pump unit with oil cooling device, heat pump system and evaporation concentration system | |
| CN211474199U (en) | A low-temperature power generation device for waste heat recovery in oil refineries | |
| CN209428171U (en) | A kind of equipment being concentrated by evaporation electroplating wastewater using solar water heater | |
| CN220564348U (en) | Hot waste water economizer system | |
| CN222099602U (en) | A normal pressure low temperature evaporation system with low energy consumption and improved evaporation specific gravity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |