CN111156154A - Evaporator, combined cooling and heating system and vacuum generator - Google Patents
Evaporator, combined cooling and heating system and vacuum generator Download PDFInfo
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- CN111156154A CN111156154A CN202010045500.2A CN202010045500A CN111156154A CN 111156154 A CN111156154 A CN 111156154A CN 202010045500 A CN202010045500 A CN 202010045500A CN 111156154 A CN111156154 A CN 111156154A
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- refrigerant
- circulating water
- water tank
- waste liquid
- liquid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
- F04B39/064—Cooling by a cooling jacket in the pump casing
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- 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
- C02F1/043—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
- F04B39/123—Fluid connections
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/346—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from semiconductor processing, e.g. waste water from polishing of wafers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
Abstract
The invention relates to an evaporator, a cold and hot combined supply system of the evaporator and a vacuum generator, wherein the evaporator comprises a waste liquid barrel, the cold and hot combined supply system and the vacuum generator; the refrigerant is in closed circulation in a combined cooling and heating system, is subjected to heat exchange with waste liquid through compression and temperature rise, is subjected to releasing, expansion and temperature reduction, sequentially cools steam and water in a circulating water tank, and is then subjected to compression and recirculation.
Description
Technical Field
The invention relates to the technical field of waste liquid treatment, in particular to an evaporator, a combined cooling and heating system and a vacuum generator.
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 treatment system, which aims to provide a heavy metal-containing waste water evaporation concentration treatment system with low medicament consumption, low treatment cost, stable treatment effect and meeting the waste water discharge standard, and the technical scheme is that the waste water evaporation concentration treatment system comprises a high-temperature water source heat pump unit, a condenser, a vacuum pump and an evaporation concentration device, wherein the high-temperature water source heat pump unit is provided with a hot water output pipe, a hot water input pipe, a cold water output pipe and a cold water input pipe, the hot water output pipe is connected with a water inlet of the evaporation concentration device, the hot water input pipe is connected with a water outlet of the evaporation concentration device, the cold water output pipe is connected with a water inlet of the condenser, the cold water input pipe is connected with a water outlet of the condenser, and the vacuum pump is respectively communicated with the condenser and the evaporation concentration device.
Disclosure of Invention
The invention aims to provide an evaporator cold and hot combined supply system which integrates a waste liquid evaporation and condensation process and a refrigerant heat dissipation and refrigeration process, supplies a heat source and a cold source in a combined manner, does not need external cold and hot auxiliary equipment and has high energy utilization efficiency. The invention solves another technical problem by providing a system low-pressure environment by adopting a fluid jet technology, synchronously discharging condensed water and non-condensed gas, and providing a vacuum generator which has a simple structure and does not discharge waste gas. The invention solves another technical problem by providing an evaporator, a combined cooling and heating system and a vacuum generator which are used for vaporizing and evaporating waste liquid at low temperature, have no chemical change in material properties, no potential safety hazard and low concentration of condensed water pollutants and realize in-situ harmless treatment.
The first technical scheme of the invention is that the evaporator is characterized by comprising a waste liquid barrel, a cold and hot combined supply system and a vacuum generator, wherein waste liquid in the waste liquid barrel enters the cold and hot combined supply system through a liquid inlet valve arranged in a pipeline, the waste liquid is evaporated and concentrated, concentrated liquid is discharged, and steam is condensed into water and is discharged after being pumped into the vacuum generator; the refrigerant is in closed cycle in the cold and heat combined supply system, and is subjected to heat exchange with the waste liquid through compression and temperature rise, then is subjected to heat dissipation and expansion, and is sequentially cooled for steam and water in the water tank, and then is subjected to compression and recirculation.
Preferably, the method comprises the following steps: the combined cooling and heating system comprises an evaporation kettle, a condenser, a compressor, a radiator, an expansion valve, a coil pipe in the evaporation kettle, a coil pipe in the condenser and a coil pipe in a circulating water tank, wherein the evaporation kettle is respectively provided with a liquid inlet valve connected with a waste liquid barrel, a liquid discharge valve connected with a liquid discharge pump and an emptying valve connected with the outside.
Preferably, the method comprises the following steps: the vacuum generator comprises an ejector, a circulating water tank and a circulating water pump which are sequentially connected through a pipeline, and a drain valve is arranged on a connecting pipeline of the circulating water pump and the ejector.
The second technical solution of the invention is the evaporator, which is characterized in that the waste liquid in the waste liquid barrel of the evaporator enters an evaporation kettle through a liquid inlet valve arranged in a pipeline, the waste liquid is evaporated and concentrated, and the concentrated liquid is discharged through a liquid discharge pump; the steam is condensed into water by the condenser, the water is pumped into the ejector and then enters the circulating water tank, and the water in the circulating water tank is pressurized by the circulating water pump and then returns to the circulating water tank again through the ejector; the refrigerant is compressed by the compressor, the pressure rises and generates a large amount of heat, the heat exchanges heat with waste liquid through a first coil pipe in the evaporation kettle, the refrigerant enters the radiator after passing through the evaporation kettle, the pressure of the refrigerant coming out of the radiator through a pipeline is rapidly reduced after passing through an expansion valve, the refrigerant enters a second coil pipe in the condenser, the refrigerant enters a circulating water tank after absorbing the heat of steam entering the condenser from the evaporation kettle, and the refrigerant enters the compressor for circulation after the temperature of the water tank is reduced.
Preferably, the method comprises the following steps: high-pressure water in the ejector forms high-speed jet flow through the nozzle, local vacuum is formed at the outlet of the nozzle, air and condensed water are pumped out, water-vapor mixed liquid enters the circulating water tank, and air in the evaporation kettle and in a connected pipeline is pumped out, so that a vacuum environment of the system is generated.
Preferably, the method comprises the following steps: and a drain valve is arranged on a connecting pipeline of the circulating water pump and the ejector, when the water level in the circulating water tank is at a high water level, the drain valve is opened, condensed water is discharged, and power is provided by the circulating water pump.
The third technical solution of the invention is the evaporator, which is characterized in that the waste liquid in the waste liquid barrel of the evaporator enters an evaporation kettle through a liquid inlet valve arranged in a pipeline, the waste liquid is evaporated and concentrated, and the concentrated liquid is discharged through a liquid discharge pump; the steam is condensed into water by the condenser, and the water enters the circulating water tank after being pumped into the ejector, and the water in the circulating water tank overflows through the water discharge hole; the refrigerant is compressed by the compressor, the pressure rises and generates a large amount of heat, the heat exchanges heat with waste liquid through a first coil pipe in the evaporation kettle, the refrigerant enters the radiator after passing through the evaporation kettle, the pressure of the refrigerant coming out of the radiator through a pipeline is rapidly reduced after passing through an expansion valve, the refrigerant enters a second coil pipe in the condenser, the refrigerant enters a circulating water tank after absorbing the heat of steam entering the condenser from the evaporation kettle, and the refrigerant enters the compressor for circulation after the temperature of the water tank is reduced.
The fourth technical solution of the invention is a combined cooling and heating system of the evaporator, which is characterized by comprising an evaporation kettle, a condenser, a radiator, a compressor, an expansion valve, a first coil pipe in the evaporation kettle, a second coil pipe in the condenser and a third coil pipe in a circulating water tank; the compressor, the first coil of the evaporation kettle, the radiator, the expansion valve, the second coil of the condenser and the third coil of the circulating water tank are sequentially connected through pipelines, and the third coil of the circulating water tank is connected with the compressor pipeline to form a closed circulating connection pipeline; a refrigerant is arranged in the pipeline, the compressor provides power, and the refrigerant forms closed cycle; after the refrigerant is compressed by the compressor, the pressure and the temperature are increased, and the first coil pipe in the evaporation kettle exchanges heat with waste liquid outside the pipe to release heat; the refrigerant enters the radiator after passing through the evaporation kettle, the refrigerant coming out of the radiator reaches an expansion valve with throttling and pressure reducing functions, the pressure and the temperature of the refrigerant are reduced through the expansion valve, the refrigerant enters a second coil pipe in the condenser, the refrigerant in the second coil pipe of the condenser and steam outside the pipe are subjected to heat exchange, the refrigerant absorbs heat and enters a third coil pipe in the circulating water tank, the refrigerant and water outside the pipe are subjected to heat exchange, the temperature of the water in the water tank can be reduced, the temperature of the refrigerant is increased, and the refrigerant enters the compressor again to be compressed.
Preferably, the method comprises the following steps: the radiator is provided with a fan, when the pressure of the high-pressure section of the refrigerant is too high, the fan is started to radiate heat to the outside, the pressure can be reduced, and when the pressure is lower than a set value, the fan is closed.
The fifth technical solution of the present invention is a vacuum generator of the evaporator, which is characterized by comprising a vacuum group consisting of an ejector, a circulating water tank and a circulating water pump which are connected in sequence through a pipeline, wherein a third coil pipe is arranged in the circulating water tank; the circulating water tank is provided with a liquid level detection device, and a drain valve is arranged on a connecting pipeline of the circulating water pump and the ejector.
Compared with the prior art, the invention has the beneficial effects that:
⑴ the waste liquid in the invention is vaporized and evaporated at low temperature, the material property does not change chemically, the potential safety hazard is avoided, the concentration of the condensed water pollutant is low, and the in-situ harmless treatment is realized.
⑵ the efficiency of converting electric energy into heat energy is high, 4-5 times of the efficiency of direct conversion of electric heat.
⑶ the waste liquid evaporation and condensation process and the refrigerant heat release and refrigeration process are in butt joint, and a heat source and a cold source are integrally supplied, so that external cold and heat auxiliary equipment is not needed, and the energy utilization efficiency is high.
⑷ the invention adopts fluid jet technology to provide low pressure environment, high vacuum degree, synchronous discharge of condensed water and non-condensed gas, simple structure of vacuum machine set, and no waste gas discharge.
⑸ the evaporator of the invention can continuously evaporate the waste liquid while discharging the condensate, and the waste liquid treatment efficiency is high.
Drawings
FIG. 1 is a schematic view of the evaporator of the present invention;
fig. 2 is a control flow chart 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 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. 1, 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, after the set 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 condensed water 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 condensed water can generate a large amount of heat when circulating in the vacuum generator 3; when the water level in the circulation water tank 32 is at a high level, the drain valve 34 is opened, the condensed water is drained, 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 water in the water tank is reduced, the temperature of the refrigerant is increased, and the refrigerant enters the compressor 24 again.
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 condensed water are extracted, the water-vapor mixed liquid enters the circulating water tank 32, and air in the evaporation kettle 22 and the connected pipeline is extracted, 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 condensed water 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 drain 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 drain valve 34 is opened, condensed water is discharged, and power is provided by the circulating water pump 32.
Referring to fig. 1, the evaporator evaporation method 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.
Referring to fig. 2, the method for controlling the evaporator includes the following steps:
⑴ system power-on start;
⑵ the first liquid level sensor detects the liquid level of the waste liquid barrel;
⑶, detecting whether the liquid level is low, if so, sending a signal to the PLC by the first liquid level sensor, controlling by the PLC to close the circulating water pump and open the emptying valve, and returning to step ⑵;
⑷ if not, the PLC controls to start the circulating water pump, and opens the liquid inlet valve, the circulating water pump operates to continuously pump out the air in the evaporation kettle, so that the evaporation kettle becomes negative pressure;
(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;
⑸ vacuum gauge detects vacuum degree;
⑹, judging whether the vacuum degree is larger than the set value, if yes, the vacuum gauge transmits a signal to the PLC, the PLC controls the start of the compressor, the refrigerant starts to circulate, if not, the step ⑸ is returned;
(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;
⑺, carrying out step ⑷, sucking the stock solution into the evaporation kettle through a liquid inlet valve by negative pressure, and detecting the liquid level of the evaporation kettle by a second liquid level sensor;
⑻, judging whether the liquid level in the evaporation kettle is higher than the high liquid level, 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 ⑺;
⑼, 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 greater than a set value by the PLC, if not, controlling to open a liquid inlet valve by the PLC, and returning to the step ⑺;
⑽ if the number of times of fluid infusion is greater than the set value, the PLC opens the vent valve and the drain valve, opens the drain pump, closes the compressor and the circulating water pump, after waiting for the set time, the concentrated solution is drained, closes the vent valve, the drain valve and the drain pump, and returns to step ⑷.
Referring to fig. 2, the method for controlling the vacuum degree detected by the evaporator vacuum gauge includes the following steps:
⑴ system power-on start;
⑵ the first liquid level sensor detects the liquid level of the waste liquid barrel;
⑶, detecting whether the liquid level is low, if so, sending a signal to the PLC by the first liquid level sensor, controlling by the PLC to close the circulating water pump and open the emptying valve, and returning to step ⑵;
⑷ if not, the PLC controls to start the circulating water pump, and opens the liquid inlet valve, the circulating water pump operates to continuously pump out the air in the evaporation kettle, so that the evaporation kettle becomes negative pressure;
⑸ vacuum gauge detects vacuum degree;
⑹, judging whether the vacuum degree is larger than the set value, if yes, the vacuum gauge transmits a signal to the PLC, the PLC controls the start of the compressor, the refrigerant starts to circulate, if not, the step ⑸ is returned;
⑺ the high-pressure section of refrigerant is provided with a pressure gauge,
⑻ the pressure gauge detects whether the pressure of the high-pressure section refrigerant is larger than the set value A, if yes, the pressure gauge transmits a signal to the PLC, the PLC controls the start of the fan to radiate heat to the outside, and the pressure value is reduced;
⑼ the pressure gauge continues to detect whether the pressure of the high pressure section refrigerant is less than the set value B, if so, the pressure gauge sends a signal to the PLC, and the PLC controls the fan to be turned off.
Referring to fig. 2, the method for controlling the liquid level detection of the evaporator includes the following steps:
⑴ system power-on start;
⑵ the first liquid level sensor detects the liquid level of the waste liquid barrel;
⑶, detecting whether the liquid level is low, if so, sending a signal to the PLC by the first liquid level sensor, controlling by the PLC to close the circulating water pump and open the emptying valve, and returning to step ⑵;
⑷ if not, the PLC controls to start the circulating water pump, and opens the liquid inlet valve, the circulating water pump operates to continuously pump out the air in the evaporation kettle, so that the evaporation kettle becomes negative pressure;
⑸ 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;
⑹, judging whether the liquid level in the evaporation kettle is higher than the high liquid level, 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 ⑸;
⑺, 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 greater than a set value by the PLC, if not, controlling to open a liquid inlet valve by the PLC, and returning to the step ⑸;
⑻ if the number of times of fluid infusion is greater than the set value, the PLC opens the vent valve and the drain valve, opens the drain pump, closes the compressor and the circulating water pump, after waiting for the set time, the concentrated solution is drained, closes the vent valve, the drain valve and the drain pump, and returns to step ⑷.
Referring to fig. 2, the method for controlling the detection of the water level in the evaporator circulation tank includes the following steps:
⑴ system power-on start;
⑵ the first liquid level sensor detects the liquid level of the waste liquid barrel;
⑶, detecting whether the liquid level is low, if so, sending a signal to the PLC by the first liquid level sensor, controlling by the PLC to close the circulating water pump and open the emptying valve, and returning to step ⑵;
⑷ if not, the PLC controls to start the circulating water pump, and opens the liquid inlet valve, the circulating water pump operates to continuously pump out the air in the evaporation kettle, so that the evaporation kettle becomes negative pressure;
⑸ detecting the water level in the circulating water tank by the third liquid level sensor, judging whether the water level is higher than the set high water level, if yes, sending signal to PLC by the third liquid level sensor in the circulating water tank, and the PLC controls to open the drain valve to drain water outwards;
⑹ the third liquid level sensor continues to detect the water level in the circulating water tank, judges whether the water level is lower than the set low water level, if yes, the third liquid level sensor sends signals to the PLC in the circulating water tank, and the PLC controls to close the drain valve.
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 (10)
1. An evaporator is characterized by comprising a waste liquid barrel, a cold and hot combined supply system and a vacuum generator, wherein waste liquid in the waste liquid barrel enters the cold and hot combined supply system through a liquid inlet valve arranged in a pipeline, the waste liquid is evaporated and concentrated, concentrated liquid is discharged, and steam is condensed into water and is pumped into the vacuum generator to be discharged; the refrigerant is in closed cycle in the combined cooling and heating system, and is subjected to heat exchange with the waste liquid through compression and heating, then is subjected to heat dissipation and expansion and cooling, and then is sequentially cooled for steam and water in the circulating water tank, and then is subjected to compression and recirculation.
2. The evaporator of claim 1, wherein the combined cooling and heating system comprises an evaporation kettle, a condenser, a compressor, a radiator, an expansion valve, a coil pipe in the evaporation kettle, a coil pipe in the condenser and a coil pipe in a circulating water tank, and the evaporation kettle is respectively provided with a liquid inlet valve connected with the waste liquid barrel, a liquid discharge valve connected with a liquid discharge pump and an emptying valve connected with the outside.
3. The evaporator according to claim 1, wherein the vacuum generator comprises an ejector, a circulating water tank and a circulating water pump which are connected in sequence through a pipeline, and a drain valve is arranged on a connecting pipeline between the circulating water pump and the ejector.
4. An evaporator is characterized in that waste liquid in a waste liquid barrel of the evaporator enters an evaporation kettle through a liquid inlet valve arranged in a pipeline, the waste liquid is evaporated and concentrated, and concentrated liquid is discharged through a liquid discharge pump; the steam is condensed into water by the condenser, the water is pumped into the ejector and then enters the circulating water tank, and the water in the circulating water tank is pressurized by the circulating water pump and then returns to the circulating water tank again through the ejector; the refrigerant is compressed by the compressor, the pressure rises and generates a large amount of heat, the heat exchanges heat with waste liquid through the first coil pipe in the evaporation kettle, the refrigerant enters the radiator after passing through the evaporation kettle, the pressure of the refrigerant coming out of the radiator through the pipeline is rapidly reduced after passing through the expansion valve, the refrigerant enters the second coil pipe in the condenser, the refrigerant enters the circulating water tank after absorbing the heat of steam entering the condenser from the evaporation kettle, and the refrigerant enters the compressor for circulation after the temperature of the water tank is reduced.
5. The evaporator of claim 4, wherein the high pressure water in the ejector forms a high velocity jet through the nozzle, creating a partial vacuum at the nozzle exit, air and condensate are drawn off, and the vapor-water mixture enters the recirculating tank and draws off air in the evaporator and associated piping, creating a vacuum environment for the system.
6. The evaporator according to claim 4, wherein a drain valve is provided on a connection line between the circulating water pump and the ejector, and when the water level in the circulating water tank is at a high level, the drain valve is opened to drain the condensed water, and power is supplied by the circulating water pump.
7. An evaporator is characterized in that waste liquid in a waste liquid barrel of the evaporator enters an evaporation kettle through a liquid inlet valve arranged in a pipeline, the waste liquid is evaporated and concentrated, and concentrated liquid is discharged through a liquid discharge pump; the steam is condensed into water by the condenser, and the water enters the circulating water tank after being pumped into the ejector, and the water in the circulating water tank automatically flows out through the water discharging hole; the refrigerant is compressed by the compressor, the pressure rises and generates a large amount of heat, the heat exchanges heat with waste liquid through a first coil pipe in the evaporation kettle, the refrigerant enters the radiator after passing through the evaporation kettle, the pressure of the refrigerant coming out of the radiator through a pipeline is rapidly reduced after passing through an expansion valve, the refrigerant enters a second coil pipe in the condenser, the refrigerant enters a circulating water tank after absorbing the heat of steam entering the condenser from the evaporation kettle, and the refrigerant enters the compressor for circulation after the temperature of the water tank is reduced.
8. A combined cooling and heating system of an evaporator is characterized by comprising an evaporation kettle, a condenser, a radiator, a compressor, an expansion valve, a first coil in the evaporation kettle, a second coil in the condenser and a third coil in a circulating water tank; the compressor, the first coil of the evaporation kettle, the radiator, the expansion valve, the second coil of the condenser and the third coil of the circulating water tank are sequentially connected through pipelines, and the third coil of the circulating water tank is connected with the compressor pipeline to form a closed circulating connection pipeline; a refrigerant is arranged in the pipeline; the compressor provides power, and the refrigerant forms a closed cycle; after the refrigerant is compressed by the compressor, the pressure and the temperature are increased, and the first coil pipe in the evaporation kettle exchanges heat with waste liquid outside the pipe to release heat; the refrigerant enters the radiator after passing through the evaporation kettle, the refrigerant coming out of the radiator reaches an expansion valve with throttling and pressure reducing functions, the pressure and the temperature of the refrigerant are reduced through the expansion valve, the refrigerant enters a second coil pipe in the condenser, the refrigerant in the second coil pipe of the condenser and steam outside the pipe are subjected to heat exchange, the refrigerant absorbs heat and enters a third coil pipe in the circulating water tank, the refrigerant and water outside the pipe are subjected to heat exchange, the temperature of the water in the water tank can be reduced, the temperature of the refrigerant is increased, and the refrigerant enters the compressor again to be compressed.
9. A combined cooling and heating system according to claim 8, wherein the radiator is provided with a fan, the fan is turned on to radiate heat to the outside when the pressure of the high pressure section of the refrigerant is excessively high, the pressure is lowered, and the fan is turned off when the pressure is lower than a set value.
10. A vacuum generator of an evaporator is characterized by comprising a vacuum group consisting of an ejector, a circulating water tank and a circulating water pump which are sequentially connected through a pipeline, wherein a third coil pipe is arranged in the circulating water tank; the circulating water tank is provided with a liquid level detection device, and a drain valve is arranged on a connecting pipeline of the circulating water pump and the ejector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010045500.2A CN111156154A (en) | 2020-01-16 | 2020-01-16 | Evaporator, combined cooling and heating system and vacuum generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010045500.2A CN111156154A (en) | 2020-01-16 | 2020-01-16 | Evaporator, combined cooling and heating system and vacuum generator |
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| CN111156154A true CN111156154A (en) | 2020-05-15 |
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| CN202010045500.2A Pending CN111156154A (en) | 2020-01-16 | 2020-01-16 | Evaporator, combined cooling and heating system and vacuum generator |
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Cited By (5)
| 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 |
| CN112811492A (en) * | 2021-02-23 | 2021-05-18 | 无锡雷德环保设备有限公司 | Device for treating production line wastewater through combination of heat pump concentration and drying device |
| CN112811491A (en) * | 2021-02-08 | 2021-05-18 | 无锡雷德环保设备有限公司 | Device for achieving closed cycle of cleaning water in production line by refrigerating and heating negative pressure of heat pump |
| CN113546436A (en) * | 2021-08-18 | 2021-10-26 | 深圳市蓝石环保科技有限公司 | Vacuum system, control method and equipment of vacuum system and evaporation treatment system |
| CN114671477A (en) * | 2022-05-27 | 2022-06-28 | 深圳市家家分类科技有限公司 | Auxiliary heating method and related device |
-
2020
- 2020-01-16 CN CN202010045500.2A patent/CN111156154A/en active Pending
Cited By (5)
| 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 |
| CN112811491A (en) * | 2021-02-08 | 2021-05-18 | 无锡雷德环保设备有限公司 | Device for achieving closed cycle of cleaning water in production line by refrigerating and heating negative pressure of heat pump |
| CN112811492A (en) * | 2021-02-23 | 2021-05-18 | 无锡雷德环保设备有限公司 | Device for treating production line wastewater through combination of heat pump concentration and drying device |
| CN113546436A (en) * | 2021-08-18 | 2021-10-26 | 深圳市蓝石环保科技有限公司 | Vacuum system, control method and equipment of vacuum system and evaporation treatment system |
| CN114671477A (en) * | 2022-05-27 | 2022-06-28 | 深圳市家家分类科技有限公司 | Auxiliary heating method and related device |
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