CN114014398A - Method, apparatus and medium for controlling evaporation of waste liquid heat pump - Google Patents

Method, apparatus and medium for controlling evaporation of waste liquid heat pump Download PDF

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Publication number
CN114014398A
CN114014398A CN202111308039.6A CN202111308039A CN114014398A CN 114014398 A CN114014398 A CN 114014398A CN 202111308039 A CN202111308039 A CN 202111308039A CN 114014398 A CN114014398 A CN 114014398A
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China
Prior art keywords
evaporation
distillate
valve
discharge
predetermined
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CN202111308039.6A
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Chinese (zh)
Inventor
李敏
刘佳惠
任晓影
马艳玲
刘金玲
王成伟
于戈
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718th Research Institute of CSIC
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718th Research Institute of CSIC
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Priority to CN202111308039.6A priority Critical patent/CN114014398A/en
Publication of CN114014398A publication Critical patent/CN114014398A/en
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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
    • 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
    • C02F2301/04—Flow arrangements
    • C02F2301/043—Treatment of partial or bypass streams
    • 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

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  • 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)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)

Abstract

The present disclosure relates to a method, apparatus, and medium for controlling evaporation of a waste liquid heat pump. The method comprises the following steps: calculating production discharge capacity and evaporation concentration times based on the concentration of the waste liquid to be treated and the waste liquid amount; feeding the evaporation tower until the liquid level of the evaporation tower reaches a first preset liquid level threshold value; heating the evaporation tower until the detected temperature of the waste liquid reaches a first preset temperature; increasing the frequency of the compressor to a predetermined frequency set value; refluxing the distillate; responsive to determining that the conductivity of the distillate is below the predetermined conductivity threshold, re-feeding the evaporation column; opening the distillate drain valve and closing the total reflux valve; and discharging the concentrated solution in response to determining that the production discharge amount of the distillate reaches a preset discharge amount threshold value or the concentration of the concentrated solution at the bottom of the tower reaches a preset concentration threshold value. The system can automatically control the evaporation process of the waste liquid heat pump, and improve the safety, reliability and stability of the system operation.

Description

Method, apparatus and medium for controlling evaporation of waste liquid heat pump
Technical Field
The present disclosure relates generally to heat pump evaporation processing technology, and in particular, to methods, computing devices, and media for controlling waste liquid heat pump evaporation.
Background
For the heat pump evaporation treatment of treating flammable and explosive, toxic and harmful waste liquid, safety reliability and operational stability of the technology for controlling the heat pump evaporation device are particularly important in view of the risk of leakage of the waste liquid.
At present, the automatic control and operation of domestic waste liquid heat pump evaporation treatment technology are still in a starting research stage, the control system and the function of the heat pump evaporation of waste liquid are not perfect, the automation degree is not high, manual operation and experience judgment are needed, the efficiency is low, the consumed time is long, and great inconvenience is brought to operators. Especially when the heat pump evaporation plant takes place unusual operating mode, rely on the artificial abnormal situation of judgement and carry out corresponding processing, emergency response and the cost of handling are high, not timely enough, and easily cause the error because of artificial reason to cause serious losses such as product nonconforming, equipment damage, device shut down, even cause the waste liquid to leak.
In conclusion, the traditional scheme for controlling the evaporation of the waste liquid heat pump has the defects of low automation degree and poor running safety reliability and stability.
Disclosure of Invention
The present disclosure provides a method, a computing device, and a medium for controlling evaporation of a waste liquid heat pump, which can automatically control an evaporation process of the waste liquid heat pump, and effectively improve safety reliability and stability of system operation.
According to a first aspect of the present disclosure, a method for controlling evaporation of a waste liquid heat pump is provided. The method comprises the following steps: calculating, at the control device, a production discharge amount and an evaporation concentration number based on the concentration of the waste liquid to be treated and the waste liquid amount; starting a feeding pump for feeding the evaporation tower until the liquid level of the evaporation tower reaches a first preset liquid level threshold value; starting an electric heater to generate heating steam to be introduced into a reboiler to heat the waste liquid in the evaporation tower until the detected temperature of the waste liquid reaches a first preset temperature; starting a fan, a water pump and a cold water system of the compressor so as to increase the frequency of the compressor to a preset frequency set value; opening a full reflux valve of the distillate to enable the heat pump evaporation device to enter a full reflux state so as to reflux the distillate; in response to determining that the conductivity of the distillate is below the predetermined conductivity threshold, re-activating the feed pump for feeding the evaporation column; opening the distillate discharge valve and closing the full-reflux valve so as to continuously evaporate and concentrate the waste liquid; and performing production discharge of the concentrated solution in response to determining that the production discharge of the distillate reaches a predetermined discharge threshold or the concentration of the tower bottom concentrated solution reaches a predetermined concentration threshold.
According to a second aspect of the present invention, there is also provided a computing device comprising: at least one processing unit; at least one memory coupled to the at least one processing unit and storing instructions for execution by the at least one processing unit, the instructions when executed by the at least one processing unit, cause the computing device to perform the method of the first aspect of the disclosure.
According to a third aspect of the present disclosure, there is also provided a computer-readable storage medium. The computer readable storage medium has stored thereon machine executable instructions which, when executed, cause a machine to perform the method of the first aspect of the disclosure.
In some embodiments, the method for controlling evaporation of a waste liquid heat pump further comprises: determining whether a predetermined early warning condition is met; and controlling the heat pump evaporation device to work in a hot standby state in response to determining that the predetermined early warning condition is met.
In some embodiments, the predetermined pre-warning condition comprises at least one of: the predetermined pre-warning condition includes at least one of: the concentrate discharge temperature exceeds a second predetermined temperature threshold; the upper material flow is less than or equal to a predetermined flow threshold; the discharge flow rate of the concentrated solution is less than or equal to a first preset flow threshold value; the evaporation tower liquid level is below a first predetermined low liquid level threshold or above a first predetermined high liquid level threshold and for a duration exceeding a first predetermined time interval; the evaporation column pressure is above a predetermined first pressure value and for a duration exceeding a first predetermined time interval; the exhaust temperature of the non-condensable gases is higher than a second preset temperature threshold value; the discharge temperature of the distillate is higher than a third predetermined temperature threshold; the monitored tank level of distillate is above a second high level threshold; the liquid level of a monitoring box of the concentrated liquid is higher than a third high liquid level threshold value; within a second preset time interval after the distillate is discharged, the distillate discharge valve is not closed, and the distillate full-reflux valve or the concentrate discharge valve is not opened; within a second preset time interval after the concentrated solution is discharged, the concentrated solution discharge valve and the distillate full-reflux valve are not closed, and the distillate discharge valve is not opened; and loss of power.
In some embodiments, controlling the heat pump evaporator to operate in the hot standby state comprises: closing the feeding valve, the distillate discharge valve and the concentrated solution discharge valve; opening a tower kettle return valve and intermittently opening an exhaust valve so as to communicate non-condensable gas in the heat pump evaporation device with an exhaust system; stopping the operation of the vapor compressor so that the energy for the heat standby of the heat pump evaporation device is completely provided by the electric heater; maintaining the temperature in the evaporation tower at the bubble point temperature of the operating pressure of the heat pump evaporation device and maintaining the natural circulation of the waste liquid; and controlling the opening of the distillate regulating valve to regulate the reflux flow of the distillation tower kettle so as to stabilize the liquid level in the tower.
In some embodiments, performing a production discharge of the concentrate comprises: the discharge amount of the concentrated solution is the same as the tower bottom reflux amount of the distillate, so that the liquid level of the tower bottom is kept stable.
In some embodiments, turning on the fan, the water pump, and the chilled water system of the compressor to increase the compressor frequency to the predetermined frequency setting comprises: opening to remove hot water; starting a fan, a water pump and a cold water system of the compressor to enable the compressor to operate at a preset first frequency; in response to the fact that the detected outlet pressure and the inlet-outlet pressure difference of the compressor are smaller than or equal to a preset safety pressure threshold value, the opening degree of a self-circulation regulating valve of the compressor is reduced; in response to determining that the detected compressor outlet pressure, inlet-outlet pressure difference, is greater than a predetermined safety pressure threshold, causing the compressor self-circulation valve to remain at a current opening for a predetermined period of time or increasing the opening of the compressor self-circulation valve; and increasing the compressor frequency to a predetermined frequency set point in response to determining to fully close the compressor self-circulation regulating valve.
In some embodiments, the method for controlling evaporation of a waste liquid heat pump further comprises: acquiring the detected pressure value of the evaporation tower; in response to determining that the detected pressure value of the evaporation tower is greater than or equal to a first predetermined pressure threshold value, intermittently opening an evaporation tower purge valve to discharge non-condensable gases in the evaporation tower; and in response to determining that the evaporation column pressure value is less than the second predetermined pressure threshold, opening a heating steam switching valve to supplement heat to the evaporation column for increasing the column pressure.
In some embodiments, the method for controlling evaporation of a waste liquid heat pump further comprises: in response to determining that the concentrated production of the waste liquid has been completed, performing a shutdown and determining whether an automatic cleaning mode is set; automatically purging the evaporation tower in response to determining that the automatic purge mode is set; and causing the evaporation tower to enter a cold isolation state in response to determining that the auto purge mode is not set.
In some embodiments, the method for controlling evaporation of a waste liquid heat pump further comprises: determining whether a full-automatic operation mode is set; determining whether waste liquid exists in the heat pump evaporation device in response to determining that the full-automatic operation mode is set; in response to the fact that no waste liquid exists in the heat pump evaporation device, the control equipment controls the heat pump evaporation device to sequentially perform feeding, preheating starting, full reflux, distillate production, concentrated liquid discharge and shutdown dredging; and in response to the fact that the waste liquid exists in the heat pump evaporation device, the control equipment controls the heat pump evaporation device to sequentially perform preheating starting, full reflux, distillate production, concentrated liquid discharge and shutdown dredging.
In some embodiments, the method for controlling evaporation of a waste liquid heat pump further comprises: in response to determining that the conductivity of the distillate is greater than or equal to the predetermined conductivity threshold, causing the heat pump evaporator to continue operating in a full reflux condition.
In some embodiments, feeding the evaporation column until it is determined that the liquid level of the evaporation column reaches the first predetermined liquid level threshold comprises: starting a feeding pump and opening a feeding valve so as to feed the evaporation tower; and in response to determining that the liquid level of the evaporation tower reaches the first predetermined liquid level threshold, stopping feeding the evaporation tower.
In some embodiments, performing the draining of the concentrate includes: stopping production of the distillate and starting production of the concentrate in response to determining that the production discharge of the distillate reaches the calculated production discharge;
opening a discharge valve of the concentrated solution, opening a full reflux valve, and closing a discharge valve of the distillate; determining whether the production discharge amount of the concentrated solution reaches the calculated production discharge amount; performing next evaporation concentration production in response to the fact that the production discharge amount of the concentrated solution reaches the calculated production discharge amount; feeding the evaporation tower continuously in response to the fact that the concentration production times do not reach the calculated evaporation concentration times; and in response to determining that the number of times of production of concentration reaches the calculated number of times of evaporative concentration, shutting down the heat pump evaporation device to enter the evacuation state.
In some embodiments, performing the draining of the concentrate includes: in response to determining that the concentration of the concentrated solution at the tower bottom reaches a preset concentration threshold value, discharging the concentrated solution; starting the production of the concentrated solution, and opening a discharge valve of the concentrated solution and a reflux valve of a tower kettle; adjusting the opening of a reflux adjusting valve of the tower kettle and the opening of a concentrated solution discharge adjusting valve so as to adjust the reflux amount of the distillate and the discharge amount of the concentrated solution; determining whether the reflux amount of the distillate is equal to the discharge amount of the concentrated solution; in response to the fact that the reflux amount of the distillate is equal to the discharge amount of the concentrated solution, continuously feeding the distillation tower for evaporation and concentration; in response to determining that the reflux amount of the distillate is not equal to the discharge amount of the concentrate, continuing to adjust the reflux amount of the distillate; determining whether the liquid level of the waste liquid tank is below a second predetermined liquid level threshold; in response to determining that the liquid level of the waste liquid tank is not below a second predetermined liquid level threshold, continuing to feed the evaporation tower; in response to determining that the liquid level of the waste tank is below a second predetermined liquid level threshold, the heat pump evaporation device is shut down to enter an evacuation state.
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.
Drawings
Fig. 1 shows a schematic diagram of a system for controlling evaporation of a waste liquid heat pump according to an embodiment of the present disclosure.
Fig. 2 shows a flow diagram for controlling waste liquid heat pump evaporation according to an embodiment of the present disclosure.
FIG. 3 shows a flow chart of a method for increasing a compressor frequency to a predetermined frequency set point according to an embodiment of the present disclosure.
Fig. 4 illustrates a flow diagram of a method of performing a production discharge of a concentrate according to some embodiments of the present disclosure. .
FIG. 5 illustrates a flow diagram of a method of performing a production discharge of a concentrate according to other embodiments of the present disclosure.
Fig. 6 shows a flow diagram of a method for automatically controlling evaporation of a waste liquid heat pump according to an embodiment of the present disclosure.
FIG. 7 schematically illustrates a block diagram of an electronic device suitable for use to implement embodiments of the present disclosure.
Like or corresponding reference characters designate like or corresponding parts throughout the several views.
Detailed Description
Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The term "include" and variations thereof as used herein is meant to be inclusive in an open-ended manner, i.e., "including but not limited to". Unless specifically stated otherwise, the term "or" means "and/or". The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like may refer to different or the same object.
As described above, the conventional solution for controlling the evaporation of the waste liquid heat pump has disadvantages in that: the automation degree is not high, and the safety reliability and the stability of the operation are not good enough.
To address, at least in part, one or more of the above issues and other potential issues, an example embodiment of the present disclosure proposes a solution for controlling waste liquid heat pump evaporation. By the control device calculating the production discharge amount and the evaporation concentration times based on the concentration of the waste liquid to be treated and the waste liquid amount, the present disclosure can predetermine the set value for controlling the evaporation of the waste liquid heat pump. Further, the present disclosure provides for the method of controlling the operation of an evaporation tower by feeding the evaporation tower until it is determined that the liquid level of the evaporation tower reaches a predetermined liquid level threshold; heating the evaporation tower until the temperature of the waste liquid reaches a preset temperature; and starting a fan, a water pump and a cold water system of the compressor so as to increase the frequency of the compressor to a preset frequency set value. This openly can realize the material loading of heat pump evaporation automatically and preheat the machine state of starting. In addition, the present disclosure provides for refluxing the distillate by opening a total reflux valve for the distillate; then feeding the evaporation tower again when the conductivity of the distillate is determined to be lower than the preset conductivity threshold value; opening the distillate discharge valve and closing the full-reflux valve so as to continuously evaporate and concentrate the waste liquid; and discharging the concentrated solution when the production discharge amount of the discharged distillate is determined to reach the calculated production discharge amount or the concentration of the concentrated solution in the tower bottom reaches a preset concentration set value. This openly can automatic control backflow distillate and concentrate's emission, does benefit to the stability of the concentration of keeping the stable and concentrate of tower cauldron liquid level. Therefore, the system can automatically control the evaporation process of the waste liquid heat pump, and can effectively improve the safety reliability and stability of the system operation.
Fig. 1 shows a schematic diagram of a system 100 for controlling a method of waste liquid heat pump evaporation according to an embodiment of the present disclosure. As shown in fig. 1, the system 100 includes, for example, a control apparatus 110, a data acquisition unit (not shown), a heat pump evaporation device 130, and a communication system (not shown). The control device 110 may perform data interaction with a data acquisition unit (not shown) and the heat pump evaporator 130 through a communication system in a wired or wireless manner.
Regarding the data collection unit, it is used to collect various instrument data of the heat pump evaporator 130, such as temperature, pressure, flow rate, liquid level, etc., so as to send to the control device 110.
The heat pump evaporation device 130 is configured to perform heat pump evaporation on the waste liquid under the control of the control device 110. The heat pump evaporator 130 includes, for example, loading, preheating start-up, total reflux, distillate, concentrate production, shutdown, evacuation, cleaning, and other working processes. As shown in fig. 1, the heat pump evaporator 130 includes, for example: the system mainly comprises a waste liquid tank 132, a feeding pump 134, a primary preheater 136, a condensate cooler 148, an evaporation tower 138, a reboiler 142, a compressor 140, an electric heater 144, a distillate pump 146 and the like. In addition, the heat pump evaporation device 130 further comprises a feeding switch valve 170 and a feeding adjusting valve 172; a compressor self-circulation switching valve (not shown), a compressor self-circulation regulating valve (not shown), a heating steam switching valve 162, a heating steam regulating valve 164, a desalted water valve 182, a superheated water eliminating switching valve 158, a superheated water eliminating regulating valve 160, an overhead reflux switching valve 154, an overhead reflux regulating valve 156, a column bottom reflux switching valve 150, a column bottom reflux regulating valve 152, a distillate discharge switching valve 174, a distillate discharge regulating valve 176, a concentrate discharge regulating valve 180, a gas-vapor mixture regulating valve (not shown), a non-condensable gas discharge regulating valve 178, an evaporation plant purge valve (not shown), and the like.
And the control device 110 is used for processing and judging various types of data of the heat pump evaporation device 130 detected by the data acquisition unit and controlling parameter variables in the device through various actuators and control valve groups. The control device 110, which may have one or more processing units, includes special purpose processing units such as GPUs, FPGAs, and ASICs, as well as general purpose processing units such as CPUs. In addition, one or more virtual machines may also be running on each control device 110. In some embodiments, the control device 110 is, for example, a PLC for controlling the heat pump evaporator 130, and can be used in three operation modes, i.e., automatic operation, semi-automatic operation, and manual operation.
As for the communication system, it is used for transmission of the accumulated flow value and electric energy and the like by the communication protocol.
A method for controlling evaporation of a waste liquid heat pump according to an embodiment of the present disclosure will be described below with reference to fig. 2. Fig. 2 shows a flow diagram of a method 200 for controlling waste liquid heat pump evaporation according to an embodiment of the present disclosure. It should be understood that the method 200 may be performed, for example, at the electronic device 700 depicted in fig. 7. May also be implemented at the control device 110 depicted in fig. 1. It should be understood that method 200 may also include additional acts not shown and/or may omit acts shown, as the scope of the disclosure is not limited in this respect.
At step 202, at the control apparatus, a production discharge amount and the number of times of evaporative concentration are calculated based on the concentration of the waste liquid to be treated and the amount of the waste liquid.
For example, the control device 110 first initializes data, resetting all valves; setting and checking initial setting values of all process parameters; monitoring the gas supply pressure of the instrument and the liquid level of the electric heater; then, based on the concentration of the waste liquid to be treated and the amount of the waste liquid, the production discharge amount and the number of times of evaporative concentration are calculated for the set values of the subsequent control.
At step 204, the control apparatus 110 activates a feed pump for feeding the vaporization tower until it is determined that the liquid level of the vaporization tower reaches a first predetermined liquid level threshold.
For example, the control device 110 activates the feeding pump 134, opens the feeding valves (e.g., the feeding on-off valve 170, the feeding regulating valve 172) for feeding the evaporation tower 138; it is then determined whether the liquid level of the evaporation column 138 reaches a first predetermined liquid level threshold; if it is determined that the liquid level of the vaporization column 138 reaches the first predetermined liquid level threshold, the feed pump 134 and the feed valves (e.g., feed on/off valve 170, feed regulating valve 172) are closed to stop feeding the vaporization column 138.
At step 206, the control device 110 turns on the electric heater 144 for generating heating steam to be introduced into the reboiler for heating the waste liquid in the evaporation tower until the detected temperature of the waste liquid reaches a first predetermined temperature.
For example, if the control apparatus 110 determines that the liquid level of the vaporization tower 138 reaches a first predetermined liquid level threshold, heating of the vaporization tower 138 is initiated; determining whether the pressure of the vaporization column 138 is above a first predetermined pressure value; if the pressure of the evaporation tower 138 is determined to be higher than the first preset pressure value, intermittently opening an air release valve of the evaporation device so as to discharge the non-condensable gas in the device into a vacuum exhaust system outside the system; determining whether the temperature of the waste liquid reaches a first predetermined temperature; stopping heating the evaporation column 138 if it is determined that the temperature of the waste liquid reaches the first predetermined temperature; meanwhile, by monitoring the pressure of the evaporation tower 138, the air release valve of the evaporation device is intermittently opened to discharge the non-condensable gas in the device to a vacuum exhaust system outside the system.
At step 208, the control device 110 turns on the compressor's fan, water pump, and cold water system to increase the compressor's frequency to a predetermined frequency set point.
As to the method for increasing the compressor frequency to the predetermined frequency set value, it includes, for example: opening to remove hot water; starting a fan, a water pump and a cold water system of the compressor to enable the compressor to operate at a preset first frequency; in response to the fact that the detected outlet pressure and the inlet-outlet pressure difference of the compressor are smaller than or equal to a preset safety pressure threshold value, the opening degree of a self-circulation regulating valve of the compressor is reduced; in response to determining that the detected compressor outlet pressure, inlet-outlet pressure difference, is greater than a predetermined safety pressure threshold, causing the compressor self-circulation valve to remain at a current opening for a predetermined period of time or increasing the opening of the compressor self-circulation valve; and increasing the compressor frequency to a predetermined frequency set point in response to determining to fully close the compressor self-circulation regulating valve. The method 300 for increasing the compressor frequency to the predetermined frequency setting will be described in detail with reference to fig. 3, and will not be described herein again.
At step 210, the control apparatus 110 opens the total reflux valve of the distillate so that the heat pump evaporator enters a total reflux state to reflux the distillate.
At step 212, the control device 110 determines whether the conductivity of the distillate is below a predetermined conductivity threshold.
At step 214, if the control apparatus 110 determines that the conductivity of the distillate is below the predetermined conductivity threshold, the feed pump is again activated for feeding the vaporization column. If the control apparatus 110 determines that the conductivity of the distillate is not below the predetermined conductivity threshold, then execution continues at step 210, such that the distillate continues to be refluxed to the evaporation column. It should be understood that the distillate cannot be discharged before it fails.
At step 216, the control apparatus 110 opens the distillate drain valve and closes the total return valve to continue evaporating the concentrated waste stream. For example, the control device 110 opens the distillate discharge valve (e.g., the distillate discharge on-off valve 174, the distillate discharge regulating valve 176), closes the total reflux valve (e.g., the column bottom reflux on-off valve 150, the column bottom reflux regulating valve 152), so that the heat pump evaporator enters the distillate production state, and performs continuous evaporative concentration of the waste liquid.
At step 218, the control apparatus 110 determines whether the production discharge of the discharged distillate has reached a predetermined discharge threshold or whether the concentration of the drum concentrate has reached a predetermined concentration threshold.
At step 220, if the control apparatus 110 determines that the production discharge of distillate reaches a predetermined discharge threshold or the concentration of the concentrate in the bottom of the column reaches a predetermined concentration threshold, the production discharge of the concentrate is performed.
As to the method for performing the production discharge of the concentrate, it includes, for example: in the process of feeding materials to the evaporation tower, intermittently discharging distillate and concentrated solution, and keeping the discharge amount of the concentrated solution to be the same as the tower kettle reflux amount of the distillate so as to maintain the liquid level of the tower kettle to be stable; or the distillate and the concentrated solution are discharged continuously for production, and a distillate with the same discharge amount as the concentrated solution flows back to the evaporation tower so as to maintain the liquid level of the tower bottom to be stable. The method 400 and the method 500 for performing the production discharge of the concentrated solution will be further described with reference to fig. 4 and 5, and will not be described herein again.
In this above-mentioned scheme, through control device based on the concentration of the waste liquid that awaits processing and waste liquid volume, calculate production discharge capacity and evaporation concentration number of times, this disclosure can predetermine the setting value of confirming the evaporation that is used for controlling the waste liquid heat pump. Further, the present disclosure provides for the method of controlling the operation of an evaporation tower by feeding the evaporation tower until it is determined that the liquid level of the evaporation tower reaches a predetermined liquid level threshold; heating the evaporation tower until the temperature of the waste liquid reaches a preset temperature; and starting a fan, a water pump and a cold water system of the compressor so as to increase the frequency of the compressor to a preset frequency set value. This openly can realize the material loading of heat pump evaporation automatically and preheat the machine state of starting. In addition, the present disclosure provides for refluxing the distillate by opening a total reflux valve for the distillate; then feeding the evaporation tower again when the conductivity of the distillate is determined to be lower than the preset conductivity threshold value; opening the distillate discharge valve and closing the full-reflux valve so as to continuously evaporate and concentrate the waste liquid; and discharging the concentrated solution when the production discharge amount of the discharged distillate is determined to reach the calculated production discharge amount or the concentration of the concentrated solution in the tower bottom reaches a preset concentration set value. This openly can the automatic control distillate and the discharge of concentrate, does benefit to the stability of the concentration that keeps the stable and concentrate of tower cauldron liquid level. Therefore, the system can automatically control the evaporation process of the waste liquid heat pump, and can effectively improve the safety reliability and stability of the system operation.
A method 300 for increasing the compressor frequency to a predetermined frequency set point according to an embodiment of the present disclosure will be described below in conjunction with fig. 3. Fig. 3 shows a flow chart of a method 300 for increasing a compressor frequency to a predetermined frequency set point according to an embodiment of the present disclosure. It should be understood that the method 300 may be performed, for example, at the electronic device 700 depicted in fig. 7. May also be implemented at the control device 110 depicted in fig. 1. It should be understood that method 300 may also include additional acts not shown and/or may omit acts shown, as the scope of the disclosure is not limited in this respect.
At step 302, the control device 110 turns on to desuperheat the water.
At step 304, the control device 110 turns on the compressor's fan, water pump, and cold water system so that the compressor operates at a predetermined first frequency. The predetermined first frequency is, for example and without limitation, at 25 Hz. For example, the control device 110 turns on the compressor's fan, water pump and water chilling system, first causing the compressor to run at a frequency of 25 Hz.
At step 306, the control device 110 determines whether the compressor outlet pressure, port pressure differential, is less than or equal to a predetermined safety pressure threshold. The predetermined safety pressure threshold value is, for example, a preset safety pressure value.
At step 308, if the control device 110 determines that the detected outlet pressure of the compressor and the inlet-outlet pressure difference are less than or equal to the predetermined safety pressure threshold, the opening degree of the compressor self-circulation regulating valve is reduced. For example, if the control device 110 determines that the compressor outlet pressure and the inlet-outlet differential pressure are lower than the set safety pressure value, the self-circulation valve continues to be closed.
At step 310, if the control apparatus 110 determines that the detected compressor outlet pressure, inlet-outlet pressure difference, is greater than the predetermined safety pressure threshold, the compressor self-circulation valve is maintained at the current opening for a predetermined period of time or the opening of the compressor self-circulation valve is increased. The predetermined period of time is, for example and without limitation, 3 to 5 minutes. For example, if the control device 110 determines that the outlet pressure of the compressor and the inlet-outlet pressure difference are greater than the predetermined safe pressure threshold, the opening of the self-circulation valve of the compressor needs to be stabilized for 3-5 min or readjusted.
At step 312, if the control apparatus 110 determines to fully close the compressor self-circulation adjustment valve, the compressor frequency is increased to a predetermined frequency set point.
By adopting the means, the safe operation of the compressor is guaranteed.
A method 400 for performing a production discharge of a concentrate in accordance with an embodiment of the present disclosure will be described below in conjunction with fig. 4. Fig. 4 illustrates a flow diagram of a method 400 of performing a production discharge of a concentrate according to some embodiments of the present disclosure. It should be understood that method 400 may be performed, for example, at electronic device 700 depicted in fig. 7. May also be implemented at the control device 110 depicted in fig. 1. It should be understood that method 400 may also include additional acts not shown and/or may omit acts shown, as the scope of the disclosure is not limited in this respect.
At step 402, the control apparatus 110 determines whether the production discharge of distillate has reached the calculated production discharge. If the control apparatus 110 determines that the production discharge of distillate has not reached the calculated production discharge, the production discharge of distillate is continued at step 420 and then jumps to step 402.
At step 404, if the control apparatus 110 determines that the production discharge of distillate has reached the calculated production discharge, the production of distillate is stopped and the production of concentrate is started.
For example, the control device 110 first stops the total reflux, starts the production of distillate, and performs the evaporation and concentration of the waste liquid; for example, start the feed pump, open the feed valve, open the distillate bleed valve, and close the distillate total reflux valve; the control device 110 then determines whether the production discharge of the distillate reaches the calculated production discharge; if the control device 110 determines that the production discharge of the distillate has not reached the calculated production discharge, the production discharge of the distillate is continued. If the control apparatus 110 determines that the production discharge of the distillate has reached the calculated production discharge, the production of the distillate is stopped and the production of the concentrate is started.
At step 406, the control device 110 opens the concentrate discharge valve, opens the full return valve, and closes the distillate discharge valve.
At step 408, the control apparatus 110 determines whether the production discharge amount of the concentrate reaches the calculated production discharge amount.
At step 410, if the control device 110 determines that the production discharge amount of the concentrated solution reaches the calculated production discharge amount, the next evaporation concentration production is performed.
At step 412, if the control apparatus 110 determines that the production discharge amount of the concentrate does not reach the calculated production discharge amount, the production discharge of the concentrate is continued.
At step 414, the control device 110 determines whether the number of times of concentration production reaches the calculated number of times of evaporation concentration. The number of times of evaporative concentration is calculated based on the concentration of the waste liquid to be treated and the amount of the waste liquid.
At step 416, if the control device 110 determines that the number of times of concentration production does not reach the calculated number of times of evaporation concentration, the feeding to the evaporation tower is continued.
At step 418, if the control apparatus 11 determines that the number of times of concentration production reaches the calculated number of times of evaporation concentration, the heat pump evaporation device is stopped to enter the evacuation state.
By adopting the technical means, the distillate and the concentrated solution are discharged intermittently in the continuous feeding process, and the discharge amount of the concentrated solution is kept to be the same as the tower kettle reflux amount of the distillate, so as to maintain the tower kettle liquid level. Because this disclosure keeps the reflux flow of distillate to the tower cauldron unanimous with the concentrate discharge flow in the in-process of above-mentioned intermittent type production, consequently, only need the material loading flow of automatic control waste liquid, can maintain tower cauldron liquid level stable, therefore, can make heat pump evaporation plant flexible operation, control simple and convenient, the controllability is strong, stability is good.
Methods 500 for performing a production discharge of a concentrate according to further embodiments of the present disclosure will be described below in conjunction with fig. 5. FIG. 5 illustrates a flow diagram of a method 500 of performing a production discharge of a concentrate according to other embodiments of the present disclosure. It should be understood that method 500 may be performed, for example, at electronic device 700 depicted in fig. 7. May also be implemented at the control device 110 depicted in fig. 1. It should be understood that method 500 may also include additional acts not shown and/or may omit acts shown, as the scope of the disclosure is not limited in this respect.
At step 502, the control device 110 determines whether the concentration of the bottoms concentrate reaches a predetermined concentration threshold.
At step 504, if the control device 110 determines that the concentration of the bottoms concentrate has not reached the predetermined concentration threshold, concentration of the concentrate continues. And then jumps to step 502.
At step 506, if the control device 110 determines that the concentration of the bottoms concentrate reaches the predetermined concentration threshold, the production of the concentrate is started and the concentrate drain valve and the bottoms return valve are opened.
For example, the control device 110 first stops the total reflux, starts the production of distillate, and performs the evaporation and concentration of the waste liquid; for example, start the feed pump, open the feed valve, open the distillate bleed valve, and close the distillate full reflux valve; then the control device 110 determines whether the concentration of the concentrated solution in the tower bottom reaches a preset concentration threshold value; if the control device 110 determines that the concentration of the concentrate in the bottom of the column has not reached the predetermined concentration threshold, concentration of the concentrate is continued. If the control device 110 determines that the concentration of the bottoms concentrate reaches the predetermined concentration threshold, the control device 110 initiates production of the concentrate and opens the concentrate drain valve and the bottoms return valve.
At step 508, the control device 110 adjusts the opening degrees of the column bottom reflux adjustment valve and the concentrate discharge adjustment valve so as to adjust the reflux amount of the distillate and the discharge amount of the concentrate.
At step 510, the control device 110 determines whether the amount of distillate reflux is equal to the discharge of concentrate.
At step 512, if the control device 110 determines that the distillate reflux is not equal to the concentrate discharge, the control device continues to adjust the distillate reflux.
At step 514, if the control apparatus 110 determines that the reflux amount of distillate is equal to the discharge amount of the concentrate, the feeding to the evaporation tower is continued for the evaporation concentration.
At step 516, the control device 110 determines whether the level of the waste tank is below a second predetermined level threshold.
At step 518, if the control apparatus 110 determines that the liquid level of the waste tank is not below the second predetermined liquid level threshold, the filling of the evaporation tower is continued, and then it jumps to step 510.
At step 520, if the control apparatus 110 determines that the liquid level of the waste tank is below a second predetermined liquid level threshold, the heat pump evaporator is shut down to enter the evacuation state.
A method 600 for automatically controlling evaporation of a waste liquid heat pump according to an embodiment of the present disclosure will be described below in conjunction with fig. 6. Fig. 6 shows a flow diagram of a method 600 for automatically controlling evaporation of a waste liquid heat pump according to an embodiment of the present disclosure. It should be understood that method 600 may be performed, for example, at electronic device 700 depicted in fig. 7. May also be implemented at the control device 110 depicted in fig. 1. It should be understood that method 600 may also include additional acts not shown and/or may omit acts shown, as the scope of the disclosure is not limited in this respect.
At step 602, the control device 110 determines whether the fully automatic operation mode is set. If the control device 110 determines that the full-automatic operation mode is not set, it jumps to step 616 where the control device controls the heat pump evaporation apparatus to operate in a manual or semi-automatic manner.
At step 604, if the control apparatus 110 determines that the full automatic operation mode is set, it is determined whether waste liquid exists in the heat pump evaporation device.
At step 606, if the control device 110 determines that there is no waste liquid in the heat pump evaporation device, the control device controls the heat pump evaporation device to sequentially perform feeding, preheating start-up, full reflux, distillate production, concentrated liquid discharge, shutdown and evacuation.
At step 608, if the control device 110 determines that there is waste liquid in the heat pump evaporation device, the control device controls the heat pump evaporation device to sequentially perform preheating start-up, full reflux, distillate production, concentrated liquid discharge, shutdown evacuation.
At step 610, the control device 110 determines whether a predetermined pre-warning condition is satisfied.
At step 612, if the control device 110 determines that the predetermined pre-warning condition is satisfied, the heat pump evaporation apparatus is controlled to automatically operate according to the hot standby module.
If the control device 110 determines that the predetermined pre-warning condition is not met, the current flow continues at step 614.
By adopting the above means, the method can automatically process abnormal working conditions, and provides guarantee for emergency processing of the heat pump evaporation device.
Regarding the method for controlling the heat pump evaporator to work in the hot standby state, the method for controlling the heat pump evaporator comprises the following steps: closing the feeding valve, the distillate discharge valve and the concentrated solution discharge valve; opening a tower kettle return valve and intermittently opening an exhaust valve so as to communicate non-condensable gas in the heat pump evaporation device with an exhaust system; stopping the operation of the vapor compressor so that the energy for the heat standby of the heat pump evaporation device is completely provided by the electric heater; maintaining the temperature in the evaporation tower at the bubble point temperature of the operating pressure of the heat pump evaporation device and maintaining the natural circulation of the waste liquid; and controlling the opening of the distillate regulating valve to regulate the reflux flow of the distillation tower kettle so as to stabilize the liquid level in the evaporation tower.
With respect to the predetermined pre-warning condition, it includes at least one of: the concentrate discharge temperature exceeds a second predetermined temperature threshold; the upper material flow is less than or equal to a predetermined flow threshold; the discharge flow rate of the concentrated solution is less than or equal to a first preset flow threshold value; the evaporation tower liquid level is below a first predetermined low liquid level threshold or above a first predetermined high liquid level threshold and for a duration exceeding a first predetermined time interval; the evaporation column pressure is above a predetermined first pressure value and for a duration exceeding a first predetermined time interval; the exhaust temperature of the non-condensable gases is higher than a second preset temperature threshold value; the discharge temperature of the distillate is higher than a third predetermined temperature threshold; the monitored tank level of distillate is above a second high level threshold; the liquid level of a monitoring box of the concentrated liquid is higher than a third high liquid level threshold value; within a second preset time interval after the distillate is discharged, the distillate discharge valve is not closed, and the distillate full-reflux valve or the concentrate discharge valve is not opened; within a second preset time interval after the concentrated solution is discharged, the concentrated solution discharge valve and the distillate full-reflux valve are not closed, and the distillate discharge valve is not opened; and loss of power.
In some embodiments, if the control apparatus 110 determines that the concentrate discharge temperature is greater than 60 ℃, or the concentrate discharge temperature is less than 35 ℃, the control apparatus determines that the concentrate discharge temperature is out of specification, and controls the heat pump evaporator to operate in a hot standby state. The reason for the concentrate discharge temperature being greater than 60 c may be due to insufficient cold water flow from the plant. The reason that the discharge temperature of the concentrate is less than 35 ℃ may be caused by the damage of the heat exchange pipe and the leakage of cold water of the equipment.
In some embodiments, if the control device 110 determines that there is no feeding flow, or the feeding flow is far below the set value within a period of time and cannot be adjusted in place, the control device determines that the feeding is abnormal and controls the heat pump evaporator to operate in the hot standby state. The reason for the abnormal feeding can be caused by the tripping of a feeding pump or the too low liquid level of a waste liquid tank.
In some embodiments, if the control device 110 determines that the discharge flow rate of the concentrate is 0, the control device determines that the production of the concentrate is abnormal, and controls the heat pump evaporator to operate in the hot standby state. An abnormal concentrate production may be caused by the concentrate pump tripping.
In some embodiments, if the control apparatus 110 determines that the evaporation tower liquid level is below the first predetermined low liquid level threshold or above the first predetermined high liquid level threshold and the duration exceeds the first predetermined time interval, for example, more than 30 seconds, the control apparatus determines that the evaporation tower liquid level is abnormal and controls the heat pump evaporation device to operate in a hot standby state. An anomaly in the level of the vaporization column may be due to a lower distillate reflux than the vaporization or a higher distillate reflux than the vaporization.
In some embodiments, if the control apparatus 110 determines that the evaporation tower pressure is higher than the predetermined first pressure value and the duration exceeds a first predetermined time interval, for example, exceeds 30 seconds, the control apparatus determines that the evaporation tower pressure is abnormal, controls the heat pump evaporation device to operate in the hot standby state.
In some embodiments, if the control device 110 determines that the exhaust temperature of the non-condensable gas is greater than 60 ℃, the control device determines that the exhaust temperature of the non-condensable gas exceeds the standard, and controls the heat pump evaporator to work in a hot standby state.
In some embodiments, if the control apparatus 110 determines that the distillate discharge temperature is greater than 50 ℃, the control apparatus determines that the distillate discharge temperature is out of specification and controls the heat pump evaporator to operate in a hot standby mode.
In some embodiments, if the control apparatus 110 determines that the monitored tank level of distillate is above the second high level threshold, the control apparatus determines that the distillate product tank is insufficient and controls the heat pump evaporator to operate in a hot standby state.
In some embodiments, if the control apparatus 110 determines that the monitored tank level of the concentrate is above the third high level threshold, the control apparatus determines that the product tank of the concentrate is insufficient and controls the heat pump evaporator to operate in a hot standby mode.
In some embodiments, if the control device 110 determines that the distillate discharge valve is not closed and the distillate full-reflux valve and the concentrate discharge valve are not opened within 10s after the end of the distillate discharge, or that the concentrate discharge valve and the distillate full-reflux valve are not closed and the distillate discharge valve is not opened within 10s after the end of the concentrate discharge, the control device determines that the production switching is abnormal and controls the heat pump evaporation device to operate in the hot standby state. The production switching abnormality may be caused by an abnormality in the valve communication control or an abnormality in the quality of the gas source.
In some embodiments, method 600 may further include: if the control device 110 determines that the concentration production of the waste liquid has been completed and the automatic washing has been selected, the control device 110 starts to control the heat pump evaporation apparatus to enter the automatic washing program; if the control device 110 determines that the concentration production of the waste liquid has been completed and the automatic cleaning is not selected, the control device 110 starts to control the heat pump evaporation apparatus to enter the cold state isolation state.
By adopting the above means, this disclosure can be applicable to automatic and steady operation of waste liquid heat pump evaporation treatment, need not artificial intervention to can automatic handling abnormal operating mode, when making heat pump evaporation plant's hot standby operating mode provide guarantee for heat pump evaporation plant's emergency treatment, can resume steady operation rapidly when the abnormal conditions is relieved.
FIG. 7 schematically illustrates a block diagram of an electronic device (or computing device) 700 suitable for use to implement embodiments of the present disclosure. The device 700 may be a device for implementing the method 200 to 600 shown in fig. 2 to 6. As shown in fig. 7, device 700 includes a Central Processing Unit (CPU)701 that may perform various appropriate actions and processes in accordance with computer program instructions stored in a Read Only Memory (ROM)702 or computer program instructions loaded from a storage unit 708 into a Random Access Memory (RAM) 703. In the RAM703, various programs and data required for the operation of the device 700 can also be stored. The CPU 701, the ROM702, and the RAM703 are connected to each other via a bus 704. An input/output (I/O) interface 705 is also connected to bus 704.
Various components in the device 700 are connected to the I/O interface 705, including: an input unit 706, an output unit 707, a storage unit 708, a processing unit 701 performs the respective methods and processes described above, for example, the methods 200 to 600. For example, in some embodiments, the methods 200-600 may be implemented as a computer software program stored on a machine-readable medium, such as the storage unit 708. In some embodiments, part or all of a computer program may be loaded onto and/or installed onto device 700 via ROM702 and/or communications unit 709. When the computer program is loaded into the RAM703 and executed by the CPU 701, one or more operations of the methods 200 to 600 described above may be performed. Alternatively, in other embodiments, the CPU 701 may be configured by any other suitable means (e.g., by way of firmware) to perform one or more of the acts of the methods 200-600.
It should be further appreciated that the present disclosure may be embodied as methods, apparatus, systems, and/or computer program products. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied thereon for carrying out various aspects of the present disclosure.
The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.
The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.
The computer program instructions for carrying out operations of the present disclosure may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, the electronic circuitry that can execute the computer-readable program instructions implements aspects of the present disclosure by utilizing the state information of the computer-readable program instructions to personalize the electronic circuitry, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA).
Various aspects of the present disclosure are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer-readable program instructions may be provided to a processor in a voice interaction device, a processing unit of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
The above are merely alternative embodiments of the present disclosure and are not intended to limit the present disclosure, which may be modified and varied by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims (15)

1. A method for controlling evaporation in a waste liquid heat pump, comprising:
calculating, at the control device, a production discharge amount and an evaporation concentration number based on the concentration of the waste liquid to be treated and the waste liquid amount;
starting a feeding pump for feeding the evaporation tower until the liquid level of the evaporation tower reaches a first preset liquid level threshold value;
starting an electric heater to generate heating steam to be introduced into a reboiler to heat the waste liquid in the evaporation tower until the detected temperature of the waste liquid reaches a first preset temperature;
starting a fan, a water pump and a cold water system of the compressor so as to increase the frequency of the compressor to a preset frequency set value;
opening a full reflux valve of the distillate to enable the heat pump evaporation device to enter a full reflux state so as to reflux the distillate;
in response to determining that the conductivity of the distillate is below the predetermined conductivity threshold, re-activating the feed pump for feeding the evaporation column;
opening the distillate discharge valve and closing the full-reflux valve so as to continuously evaporate and concentrate the waste liquid; and
and responding to the fact that the production discharge amount of the distillate reaches a preset discharge amount threshold value or the concentration of the concentrated solution at the bottom of the tower reaches a preset concentration threshold value, and performing the production discharge of the concentrated solution.
2. The method of claim 1, further comprising:
determining whether a predetermined early warning condition is met; and
and controlling the heat pump evaporation device to work in a hot standby state in response to determining that the preset early warning condition is met.
3. The method of claim 2, wherein the predetermined pre-warning condition comprises at least one of:
the concentrate discharge temperature exceeds a second predetermined temperature threshold;
the upper material flow is less than or equal to a predetermined flow threshold;
the discharge flow rate of the concentrated solution is less than or equal to a first preset flow threshold value;
the evaporation tower liquid level is below a first predetermined low liquid level threshold or above a first predetermined high liquid level threshold and for a duration exceeding a first predetermined time interval;
the evaporation column pressure is above a predetermined first pressure value and for a duration exceeding a first predetermined time interval;
the exhaust temperature of the non-condensable gases is higher than a second preset temperature threshold value;
the discharge temperature of the distillate is higher than a third predetermined temperature threshold;
the monitored tank level of distillate is above a second high level threshold;
the liquid level of a monitoring box of the concentrated liquid is higher than a third high liquid level threshold value;
within a second preset time interval after the distillate is discharged, the distillate discharge valve is not closed, and the distillate full-reflux valve or the concentrate discharge valve is not opened;
within a second preset time interval after the concentrated solution is discharged, the concentrated solution discharge valve and the distillate full-reflux valve are not closed, and the distillate discharge valve is not opened; and
and (6) losing power.
4. The method of claim 2, wherein controlling the heat pump evaporator to operate in a hot standby state comprises:
closing the feeding valve, the distillate discharge valve and the concentrated solution discharge valve;
opening a tower kettle return valve and intermittently opening an exhaust valve so as to communicate non-condensable gas in the heat pump evaporation device with an exhaust system;
stopping the operation of the vapor compressor so that the energy for the heat standby of the heat pump evaporation device is completely provided by the electric heater;
maintaining the temperature in the evaporation tower at the bubble point temperature of the operating pressure of the heat pump evaporation device and maintaining the natural circulation of the waste liquid; and
the opening of the distillate regulating valve is controlled to regulate the reflux flow of the distillation tower kettle so as to stabilize the liquid level in the tower.
5. The method of claim 1, wherein performing a production discharge of the concentrate comprises:
the discharge amount of the concentrated solution is the same as the tower bottom reflux amount of the distillate, so that the liquid level of the tower bottom is kept stable.
6. The method of claim 1, wherein turning on a fan, a water pump, and a chilled water system of the compressor to increase the compressor frequency to a predetermined frequency setting comprises:
opening to remove hot water;
starting a fan, a water pump and a cold water system of the compressor to enable the compressor to operate at a preset first frequency;
in response to the fact that the detected outlet pressure and the inlet-outlet pressure difference of the compressor are smaller than or equal to a preset safety pressure threshold value, the opening degree of a self-circulation regulating valve of the compressor is reduced;
in response to determining that the detected compressor outlet pressure, inlet-outlet pressure difference, is greater than a predetermined safety pressure threshold, causing the compressor self-circulation valve to remain at a current opening for a predetermined period of time or increasing the opening of the compressor self-circulation valve; and
in response to determining to fully close the compressor self-circulation adjustment valve, the compressor frequency is increased to a predetermined frequency set point.
7. The method of claim 1, further comprising:
acquiring the detected pressure value of the evaporation tower;
in response to determining that the detected pressure value of the evaporation tower is greater than or equal to a first predetermined pressure threshold value, intermittently opening an evaporation tower purge valve to discharge non-condensable gases in the evaporation tower; and
in response to determining that the evaporation column pressure value is less than the second predetermined pressure threshold, a heating steam switching valve is opened to supplement heat to the evaporation column for increasing the column pressure.
8. The method of claim 1, further comprising:
in response to determining that the concentrated production of the waste liquid has been completed, performing a shutdown and determining whether an automatic cleaning mode is set;
automatically purging the evaporation tower in response to determining that the automatic purge mode is set; and
causing the evaporation column to enter a cold isolation state in response to determining that an auto purge mode is not set.
9. The method of claim 2, further comprising:
determining whether a full-automatic operation mode is set;
determining whether waste liquid exists in the heat pump evaporation device in response to determining that the full-automatic operation mode is set;
in response to the fact that no waste liquid exists in the heat pump evaporation device, the control equipment controls the heat pump evaporation device to sequentially perform feeding, preheating starting, full reflux, distillate production, concentrated liquid discharge and shutdown dredging; and in response to the fact that the waste liquid exists in the heat pump evaporation device, the control equipment controls the heat pump evaporation device to sequentially perform preheating starting, full reflux, distillate production, concentrated liquid discharge and shutdown dredging.
10. The method of claim 1, further comprising:
in response to determining that the conductivity of the distillate is greater than or equal to the predetermined conductivity threshold, causing the heat pump evaporator to continue operating in a full reflux condition.
11. The method of claim 1, wherein feeding the evaporation column until it is determined that the liquid level of the evaporation column reaches the first predetermined liquid level threshold comprises:
starting a feeding pump and opening a feeding valve so as to feed the evaporation tower; and
in response to determining that the liquid level of the evaporation column reaches the first predetermined liquid level threshold, stopping feeding the evaporation column.
12. The method of claim 1, wherein performing a discharge of the concentrate comprises:
stopping production of the distillate and starting production of the concentrate in response to determining that the production discharge of the distillate reaches the calculated production discharge;
opening a discharge valve of the concentrated solution, opening a full reflux valve, and closing a discharge valve of the distillate;
determining whether the production discharge amount of the concentrated solution reaches the calculated production discharge amount;
performing next evaporation concentration production in response to the fact that the production discharge amount of the concentrated solution reaches the calculated production discharge amount;
feeding the evaporation tower continuously in response to the fact that the concentration production times do not reach the calculated evaporation concentration times; and
in response to determining that the number of times of concentration production reaches the calculated number of times of evaporative concentration, the heat pump evaporation apparatus is stopped to enter the evacuation state.
13. The method of claim 1, wherein performing a discharge of the concentrate comprises:
in response to determining that the concentration of the concentrated solution at the tower bottom reaches a preset concentration threshold value, discharging the concentrated solution;
starting the production of the concentrated solution, and opening a discharge valve of the concentrated solution and a reflux valve of a tower kettle;
adjusting the opening of a reflux adjusting valve of the tower kettle and the opening of a concentrated solution discharge adjusting valve so as to adjust the reflux amount of the distillate and the discharge amount of the concentrated solution;
determining whether the reflux amount of the distillate is equal to the discharge amount of the concentrated solution;
in response to the fact that the reflux amount of the distillate is equal to the discharge amount of the concentrated solution, continuously feeding the distillation tower for evaporation and concentration;
in response to determining that the reflux amount of the distillate is not equal to the discharge amount of the concentrate, continuing to adjust the reflux amount of the distillate;
determining whether the liquid level of the waste liquid tank is below a second predetermined liquid level threshold;
in response to determining that the liquid level of the waste liquid tank is not below a second predetermined liquid level threshold, continuing to feed the evaporation tower;
in response to determining that the liquid level of the waste tank is below a second predetermined liquid level threshold, the heat pump evaporation device is shut down to enter an evacuation state.
14. A computing device, comprising:
at least one processing unit;
at least one memory coupled to the at least one processing unit and storing instructions for execution by the at least one processing unit, the instructions when executed by the at least one processing unit causing the computing device to perform the method of any of claims 1-12.
15. A computer readable storage medium having stored thereon machine executable instructions which, when executed, cause a machine to perform the method of any one of claims 1 to 12.
CN202111308039.6A 2021-11-05 2021-11-05 Method, apparatus and medium for controlling evaporation of waste liquid heat pump Pending CN114014398A (en)

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