CN114014395A - Waste liquid heat pump evaporation system and liquid level control method, control equipment and medium thereof - Google Patents
Waste liquid heat pump evaporation system and liquid level control method, control equipment and medium thereof Download PDFInfo
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- CN114014395A CN114014395A CN202111307124.0A CN202111307124A CN114014395A CN 114014395 A CN114014395 A CN 114014395A CN 202111307124 A CN202111307124 A CN 202111307124A CN 114014395 A CN114014395 A CN 114014395A
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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
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/04—Flow arrangements
- C02F2301/043—Treatment of partial or bypass streams
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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
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Abstract
The present disclosure relates to a method for controlling a tower still liquid level of a waste liquid heat pump evaporation system, a control device and a medium. The method comprises the following steps: at a control device, acquiring the current liquid level and concentration of the tower kettle waste liquid of the evaporation tower, the flow of secondary steam output from the tower top of the evaporation tower and the feeding flow of the waste liquid; obtaining the tower kettle reflux flow of distillate and the discharge amount of concentrated solution; controlling at least one of a concentrated solution discharge valve and a tower bottom reflux valve so that the tower bottom reflux flow of the distillate is matched with the discharge amount of the concentrated solution; and adjusting the opening of a feeding adjusting valve on a waste liquid feeding pipeline based on the obtained current liquid level of the tower kettle waste liquid, the flow of secondary steam and the waste liquid feeding flow, so that the difference value of the current liquid level of the tower kettle waste liquid and a preset first liquid level is within a first preset range, and the waste liquid feeding pipeline is arranged between a feeding pump and a waste liquid preheater. This openly can realize the accurate and stable control of the tower cauldron waste liquid level of evaporating tower.
Description
Technical Field
The present disclosure relates generally to heat pump evaporation treatment technology, and in particular, to a method for controlling a column bottom liquid level of a waste liquid heat pump evaporation system, a control apparatus, and a medium.
Background
For a heat pump evaporation treatment system for treating flammable, explosive, toxic and harmful waste liquid, the safety reliability and the operation stability of a control technology for controlling the waste liquid heat pump evaporation system are particularly important in view of the risk of leakage of the waste liquid.
Because the heavy components or salt ions in the waste liquid are generally non-volatile, the water in the waste liquid can be evaporated and vaporized into secondary steam through a heat pump evaporation system, then distilled water is obtained through condensation, the heavy components or salt ions are remained in the concentrated liquid, so that the waste liquid can be treated through an evaporation concentration method, and the heavy components or salt ions can be concentrated in the concentrated liquid to be discharged so as to be further stored or treated. The level and stability of the liquid level of the tower bottom waste liquid of the evaporation tower which is a core component of the heat pump evaporation system can directly influence the evaporation effect of the waste liquid, for example, too high or too low liquid level of the tower bottom waste liquid can easily cause too much foam to influence the gas-liquid separation effect or cause dry burning. The traditional method for controlling the liquid level of the tower bottom of the waste liquid heat pump evaporation system, particularly the liquid level of the tower bottom waste liquid of the evaporation tower, is controlled only by adjusting the feeding flow of the waste liquid. However, when the tower pressure fluctuates or the secondary steam flow changes, the liquid level of the waste liquid in the tower kettle fluctuates to cause false liquid level, so that the liquid level control in the tower kettle is difficult to accurately and stably maintain at the liquid level set value.
In conclusion, the traditional scheme of the method for controlling the liquid level of the tower kettle of the waste liquid heat pump evaporation system has the defects that the liquid level fluctuation and the false liquid level of the waste liquid caused by the tower pressure fluctuation are difficult to overcome, and the liquid level control of the tower kettle is not accurate and stable enough.
Disclosure of Invention
The utility model provides a method, a waste liquid heat pump evaporation system, a control device and a medium for controlling the liquid level of a tower kettle of the waste liquid heat pump evaporation system, which can realize the accurate and stable control of the liquid level of the tower kettle waste liquid of an evaporation tower.
According to a first aspect of the present disclosure, a method for controlling a column bottom liquid level of a waste liquid heat pump evaporation system is provided. The waste liquid heat pump evaporation system at least comprises an evaporation tower, a waste liquid box, a reboiler and control equipment, wherein waste liquid in the waste liquid box is sent to the evaporation tower and the reboiler through a feeding pump and a waste liquid preheater, at least part of distillate flows back to the evaporation tower through a tower kettle return valve, and part of concentrated liquid in the evaporation tower is discharged out of the evaporation tower through a concentrated liquid discharge valve. The method comprises the following steps: at a control device, acquiring the current liquid level and concentration of the tower kettle waste liquid of the evaporation tower, the flow of secondary steam output from the tower top of the evaporation tower and the feeding flow of the waste liquid; obtaining the tower kettle reflux flow of distillate and the discharge amount of concentrated solution; controlling at least one of a concentrated solution discharge valve and a tower bottom reflux valve so that the tower bottom reflux flow of the distillate is matched with the discharge amount of the concentrated solution; and adjusting the opening of a feeding adjusting valve on a waste liquid feeding pipeline based on the obtained current liquid level of the tower kettle waste liquid, the flow of secondary steam and the waste liquid feeding flow, so that the difference value of the current liquid level of the tower kettle waste liquid and a preset first liquid level is within a first preset range, and the waste liquid feeding pipeline is arranged between a feeding pump and a waste liquid preheater.
According to a second aspect of the present invention there is also provided a waste liquid heat pump evaporation system, the system comprising: a waste liquid tank for storing waste liquid, wherein the waste liquid in the waste liquid tank is sent to the evaporation tower and the reboiler through the feeding regulating valve and the waste liquid preheater; the evaporation tower is used for carrying out evaporation operation on the waste liquid in the evaporation tower so as to generate secondary steam and concentrated liquid; a concentrate discharge valve disposed on the concentrate discharge line for causing the generated concentrate to be discharged out of the evaporation tower via the concentrate discharge valve; the tower kettle return valve is arranged on the tower kettle return line and used for enabling at least part of distillate to flow back to the evaporation tower through the tower kettle return valve, and the concentrated solution discharge line and the tower kettle return line are communicated with the bottom of the evaporation tower; the reboiler is used for providing heat for the bottom of the evaporation tower; and a control device comprising at least one processing unit and at least one memory coupled to the at least one processing unit and storing instructions for execution by the at least one processing unit, which when executed by the at least one processing unit, cause the control device to perform the method of the first aspect of the disclosure.
According to a third aspect of the present invention, there is also provided a control apparatus. The control device comprises at least one processing unit and at least one memory coupled to the at least one processing unit and storing instructions for execution by the at least one processing unit, which when executed by the at least one processing unit, cause the control device to perform the method of the first aspect of the present disclosure.
According to a fourth 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, controlling at least one of the concentrate discharge valve and the bottoms reflux valve such that the bottoms reflux flow rate of the distillate matches the discharge of the concentrate comprises: determining whether the concentration of the tower bottom waste liquid is within a second preset range of a preset concentration set value; and maintaining the concentrate discharge valve at the current opening in response to determining whether the concentration of the column bottom waste is within a second predetermined range of the predetermined concentration set point.
In some embodiments, determining whether the concentration of column bottoms liquid waste is within a second predetermined range of the predetermined concentration setpoint comprises: calculating the density of the tower kettle waste liquid based on the current static pressure difference of the certain tower kettle liquid level measured by the air blowing type liquid level meter; and determining whether the calculated concentration of the tower bottom waste liquid is within a second preset range of the preset concentration set value through the density of the waste liquid.
In some embodiments, controlling at least one of the concentrate discharge valve and the drum reflux valve such that the drum reflux flow rate of the distillate matches the discharge of the concentrate further comprises: determining whether the difference between the tower bottom reflux flow of the distillate and the discharge amount of the concentrated solution is larger than a preset threshold value; adjusting, via a valve positioner, an opening of a column bottom reflux adjusting valve on a column bottom reflux line disposed between a column bottom and a column top reflux line of an evaporation column, based on a difference between a column bottom reflux flow of distillate and a discharge amount of concentrate in response to determining that the difference between the column bottom reflux flow of the distillate and the discharge amount of the concentrate is greater than a predetermined threshold; and determining that the bottoms reflux flow rate of the distillate matches the draw off of the concentrate in response to determining that the difference between the bottoms reflux flow rate of the distillate and the draw off of the concentrate is less than or equal to a predetermined threshold.
In some embodiments, adjusting the opening of the feed regulating valve on the waste liquid feed line so that the difference between the current level of the column bottom waste liquid and the predetermined first level is within a first predetermined range comprises: determining whether the difference value of the current liquid level of the tower bottom waste liquid of the evaporation tower and a preset first liquid level is within a first preset range, wherein the current liquid level of the tower bottom waste liquid is measured by an air blowing type liquid level meter; in response to determining that the difference value between the current liquid level of the tower bottom waste liquid of the evaporation tower and a preset first liquid level is not within a first preset range, determining the opening degree of a feeding adjusting valve through PID calculation based on the obtained current liquid level of the tower bottom waste liquid, the flow of secondary steam and the waste liquid feeding flow; and adjusting a valve positioner of the feeding adjusting valve based on the determined opening degree of the feeding adjusting valve so that the difference value between the current liquid level of the tower bottom waste liquid and the preset first liquid level is within a first preset range.
In some embodiments, the method for controlling a column bottom liquid level of a waste liquid heat pump evaporation system further comprises: determining whether the reflux ratio of the vaporization tower is within a third predetermined range of the reflux ratio set point; and adjusting the opening of the overhead reflux valve in response to determining that the reflux ratio of the vaporization column is not within a third predetermined range of the reflux ratio set point to control the flow of overhead reflux distillate to bring the reflux ratio within the third predetermined range of the reflux ratio set point.
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 implementing a method of controlling a column bottom liquid level of a waste liquid heat pump evaporation system, according to an embodiment of the present disclosure.
Fig. 2 shows a flow diagram of a method for controlling a column bottom liquid level of a waste liquid heat pump evaporation system according to an embodiment of the present disclosure.
Fig. 3 shows a schematic diagram of a waste liquid heat pump evaporation system according to an embodiment of the present disclosure.
FIG. 4 illustrates a flow diagram of a method for matching still reflux flow to concentrate discharge in accordance with an embodiment of the present disclosure.
FIG. 5 shows a flow diagram of a method for controlling a reflux ratio of an evaporation column according to an embodiment of the present disclosure.
FIG. 6 schematically shows a block diagram of an electronic device suitable for use to implement an embodiment of the 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 method for controlling the bottom liquid level of the waste liquid heat pump evaporation system generally controls the height of the bottom liquid level of the evaporation tower only by adjusting the feed flow of the waste liquid. However, when the tower pressure fluctuates or the secondary steam flow changes, the liquid level of the waste liquid in the tower kettle fluctuates to cause false liquid level, so that the liquid level control in the tower kettle is difficult to accurately and stably control at the liquid level set value.
To address, at least in part, one or more of the above issues and other potential issues, an example embodiment of the present disclosure presents a solution for a method of controlling a column tank liquid level of a waste liquid heat pump evaporation system. Obtaining the current liquid level and concentration of the tower kettle waste liquid of the evaporation tower, the flow of secondary steam output from the tower top of the evaporation tower, the feeding flow of the waste liquid, the tower kettle reflux flow of distillate and the discharge amount of concentrated solution through control equipment; controlling at least one of a concentrated solution discharge valve and a tower bottom reflux valve so that the tower bottom reflux flow of the distillate is matched with the discharge amount of the concentrated solution; this openly can effectively guarantee the material conservation of the tower cauldron reflux flow of the distillate of entering evaporating tower and the discharge of the concentrate of outflow evaporating tower to avoid because of the interference that the stranded feeding ejection of compact brought for liquid level control, reduce tower cauldron liquid level control's complexity. In addition, this disclosure is through the current liquid level based on the tower cauldron waste liquid that acquires, the flow of secondary steam, waste liquid material loading flow, confirms the aperture of the material loading governing valve on the waste liquid material loading pipeline to the current liquid level of tower cauldron waste liquid reaches predetermined first liquid level, accurate and the stable control of the tower cauldron waste liquid level of evaporating tower can be realized to this disclosure.
Fig. 1 shows a schematic diagram of a system 100 for a method of controlling a column bottom liquid level of a waste liquid heat pump evaporation system, according to an embodiment of the present disclosure. As shown in fig. 1, the system 100 includes, for example, a control apparatus 110 and a heat pump evaporator 120. The heat pump evaporator 120 further includes an evaporator tower 140, a waste tank (not shown), a reboiler 130, a waste preheater (such as, but not limited to, including a primary preheater 134, a condensate cooler 136), a vapor compressor (not shown), and the like. The control device 110 may perform data interaction with a data acquisition unit (not shown) and the heat pump evaporator 120 through a communication system in a wired or wireless manner.
As for the waste liquid tank, it is used for storing waste liquid. The waste liquid in the waste liquid tank is sent to the evaporation tower 140 and the reboiler 130 through a feeding pump, a feeding adjusting valve 132, a primary preheater 134 and a condensate cooler 136.
With respect to the waste liquid preheater (e.g., the primary preheater 134 and the condensate cooler 136), it is used to preheat waste liquid from the waste liquid tank.
As for the evaporation tower 140, it is used to perform an evaporation operation on the waste liquid in the evaporation tower 140 so that the waste liquid is boiled in saturation and separated into a secondary vapor (vapor phase) and a concentrated liquid (liquid phase). The top of the evaporation column 140 is connected to a top reflux line, and the distillate can flow into the evaporation column 140 through the top reflux line. Overhead reflux line 162 is provided with an overhead reflux on-off valve and an overhead reflux regulating valve (collectively referred to as an "overhead reflux valve", not shown in fig. 1). The flow of the reflux distillate at the top of the tower can be controlled by adjusting the opening of the reflux valve at the top of the tower. The bottom (lower end) of the evaporation column 140 is connected to a bottom reflux line 148 and a concentrate discharge line 160. The column bottom reflux line 148 is provided with a column bottom reflux switch valve and a column bottom reflux regulating valve (collectively referred to as "column bottom reflux valve 142"). A bottoms reflux line 148 is used to reflux at least a portion of the distillate to the vaporization column 140 via bottoms reflux valve 142. The concentrate discharge line 160 is used to discharge at least a portion of the concentrate of the evaporation column 140 out of the evaporation column 140. A concentrate discharge regulating valve (not shown in fig. 1) is provided on the concentrate discharge line 160.
And a compressor (not shown in fig. 1) which is communicated with the top end of the evaporation tower 140 and is used for compressing the secondary steam output by the evaporation tower 140 so as to increase the temperature and the pressure of the secondary steam. The compressed secondary steam is sent to the reboiler 130 shell side to heat the spent liquor.
With respect to reboiler 130, it is used to provide heat to the bottom of the vaporization column 140.
With regard to the control device 110, it includes, for example, at least one processing unit and at least one memory coupled to the at least one processing unit and storing instructions for execution by the at least one processing unit to control the heat pump evaporation apparatus 120 when the instructions are executed by the at least one processing unit. 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 120, and can be used in three operation modes, i.e., automatic operation, semi-automatic operation, and manual operation. In some embodiments, the control device further comprises a communication system for transmitting the accumulated flow value and the electric energy via a communication protocol, etc.
A method for controlling a column bottoms level of a waste liquid heat pump evaporation system according to an embodiment of the present disclosure will be described below with reference to fig. 1-3. Fig. 2 illustrates a flow diagram of a method 200 for controlling a column bottom liquid level of a waste liquid heat pump evaporation system, according to an embodiment of the disclosure. Fig. 3 shows a schematic diagram of a waste liquid heat pump evaporation system 300 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 600 depicted in fig. 6. 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, the control device 110 obtains the current liquid level and concentration of the still waste liquid of the evaporation tower, the flow rate of the secondary steam output from the top of the evaporation tower, and the waste liquid feed flow rate. The evaporation tower is included by waste liquid heat pump evaporation system, and waste liquid heat pump evaporation system still includes at least, waste liquid case, reboiler and controlgear, and the waste liquid in the waste liquid case is sent to evaporation tower and reboiler behind material loading pump, waste liquid pre-heater (for example, first order pre-heater, gas condensate cooler), and at least some distillate flows back to the evaporation tower through tower cauldron return valve, and the concentrate of evaporation tower discharges the evaporation tower through the concentrate discharge valve.
The method 200 is, for example, operated when the waste liquid heat pump evaporation system 300 is operating stably, or in normal production conditions. For example, taking fig. 3 as an example, the waste liquid heat pump evaporation system 300 goes through the processes of feeding, preheating, starting, and full reflux, and then enters the normal production conditions of distillate and concentrate. The following will illustrate the charging, preheating startup, and total reflux processes of the waste liquid heat pump evaporation system 300 with reference to fig. 3. It should be appreciated that the charging, warm-up start-up, full-reflux process of the waste liquid heat pump evaporation system 300 is not limited to the following exemplary process.
With respect to the loading process, for example, the control device 110 first initializes data, resets all valves; setting and checking initial setting values of all process parameters; monitoring the instrument gas supply pressure and the liquid level of the electric heater 360; 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. Thereafter, the control device 110 activates the loading pump 304, opens the loading on-off valve 306 and the loading adjusting valve 308 for loading the evaporation tower 330 until it is determined that the liquid level of the evaporation tower 330 reaches a first predetermined liquid level threshold (e.g., a predetermined high liquid level set point) or the difference from the predetermined first liquid level is within a first predetermined range. The first predetermined range is for example the error allowed for the target level.
As for the warm-up startup process, it includes, for example: if the control device 110 determines that the liquid level of the evaporation column 330 reaches a first predetermined liquid level threshold (e.g., a predetermined high liquid level set point), the feeding is stopped. The heating steam switching valve 344 and the heating steam regulating valve 346 are opened to introduce steam into the reboiler 342 to start heating the waste liquid. When the waste liquid temperature reaches the set temperature, the heating steam switching valve 344 and the heating steam adjusting valve 346 are closed, and the heating is stopped. Thereafter, the control device 110 activates the distilled water pump 364 to open the superheated water removal switching valve 326 and the superheated water removal regulating valve 328, so that the superheated water is introduced into the inlet of the compressor 350 at a flow rate to remove the degree of superheat during the operation of the compressor. 362 is a desalination valve. The control device 110 turns on the blower, the water pump, and the chilled water system of the compressor 350, starts the compressor system such that the compressor 350 operates, for example, first at a predetermined first frequency (e.g., without limitation, 25Hz), and then gradually closes the compressor self-circulation regulating valve 354, during which the control device 110 may determine whether the outlet pressure, the inlet-outlet differential pressure, of the compressor 350 is less than or equal to a predetermined safe pressure threshold; if less than or equal to a predetermined safe pressure threshold, the compressor self-circulation regulating valve 354 continues to be closed, if greater than the predetermined safe pressure threshold, the compressor self-circulation valve 354 is maintained at the current opening for a predetermined period of time (e.g., without limitation, 3-5 min) or the opening of the compressor self-circulation valve 354 is increased, and if it is determined that the self-circulation regulating valve 354 of the compressor 350 is completely closed, the frequency of the compressor 350 is increased to a predetermined frequency setting (e.g., without limitation, 55 Hz). 352 is a compressor self-circulation on-off valve. By adopting the above means, it is beneficial to ensure the safe operation of the compressor 350.
As for the total reflux process, it includes, for example: the control device 110 determines whether the pressure of the vaporization tower 330 is below a predetermined pressure set point (e.g., without limitation, 60 kPa); if it is determined that the pressure is lower than the predetermined pressure set value, the heating steam switching valve 344 is opened and the opening of the heating steam adjusting valve 346 is controlled to supplement heat to the heat pump evaporation device to increase the pressure of the evaporation tower 330. Then, the control device 110 opens the column bottom reflux switch valve 316 and the column bottom reflux adjusting valve 318 of the distillate to enter the full reflux working condition of the waste liquid heat pump evaporation system 300. With respect to normal production conditions, the control apparatus 110 determines whether the conductivity of the distillate is below a predetermined conductivity threshold; if the control apparatus 110 determines that the distillate conductivity is below a predetermined conductivity threshold (e.g., without limitation, 1 μ S/cm), the feed pump 304 is again activated for feeding the evaporation column 330 into normal production conditions of the heat pump evaporation system 300.
In normal production conditions, distillate and concentrate are for example continuously discharged simultaneously for production. Specifically, the control device 110 starts the feeding pump 304, opens the feeding switch valve 306 and the feeding adjusting valve 308, feeds the distillation column 330, opens the distillate discharging switch valve 314 and the distillate discharging adjusting valve 312, closes the column bottom reflux switch valve 316, and discharges the qualified distillate for production. When the waste liquid in the evaporation tower 330 is evaporated and concentrated to a set concentration or density, the concentrated liquid discharge valve 332 is opened, and the distillate tower bottom reflux switch valve 316 and the distillate tower bottom reflux adjusting valve 318 are opened.
As shown in fig. 1, the control device 110 obtains the waste liquid feed flow rate via the first flow meter 152; acquiring the flow rate of the secondary steam output from the top of the evaporation tower through a second flow meter 154; the level of column bottoms waste is taken via a first level gauge 150.
At step 204, the control apparatus 110 obtains the still reflux flow rate of the distillate and the discharge of the concentrate.
For example, the control apparatus 110 obtains the column reflux flow rate of the distillate via the fourth flow meter 146; and the discharge amount of the concentrate is acquired via the fifth flow meter 122.
At step 206, the control device 110 controls at least one of the concentrate discharge valve and the bottoms reflux valve so that the bottoms reflux flow rate of the distillate matches the discharge of concentrate. For example, the control device 110 automatically adjusts the concentrate discharge valve (e.g., 332 in FIG. 3) and the drum reflux valve (e.g., the distillate drum reflux adjustment valve 318 in FIG. 3) so that the reflux flow rate of the distillate coincides with the concentrate discharge flow rate to maintain stable operation of the drum liquid level. In some embodiments, the control device 110 may fixedly control the opening of the concentrate discharge valve, and only adjust the column bottom reflux valve so that the difference between the reflux flow rate of the distillate and the concentrate discharge flow rate is less than or equal to a predetermined threshold or so that the column bottom reflux flow rate of the distillate matches the discharge amount of the concentrate.
With regard to the method for matching the column reflux flow rate of distillate and the discharge amount of concentrate, it includes, for example: determining whether the concentration of the tower bottom waste liquid is within a second preset range of a preset concentration set value; and in response to determining that the concentration of the column bottom effluent is within a second predetermined range of the predetermined concentration set point, maintaining the concentrate discharge valve at the current opening; determining whether the difference between the tower bottom reflux flow of the distillate and the discharge amount of the concentrated solution is larger than a preset threshold value; in response to determining that the difference between the tower bottom reflux flow of the distillate and the discharge amount of the concentrate is greater than the predetermined threshold, adjusting, via a valve positioner, an opening of a tower bottom reflux adjusting valve on a tower bottom reflux line disposed between a tower bottom and a tower top reflux line of the evaporation tower, based on the difference between the tower bottom reflux flow of the distillate and the discharge amount of the concentrate; and determining that the bottoms reflux flow rate of the distillate matches the draw off of the concentrate in response to determining that the difference between the bottoms reflux flow rate of the distillate and the draw off of the concentrate is less than or equal to a predetermined threshold. Regarding the method for controlling the concentrate discharge valve and the tank reflux valve, the following will be further described with reference to fig. 4, and the detailed description thereof will be omitted.
Regarding the method for determining whether the concentration of the column bottom waste liquid is within the second predetermined range of the predetermined concentration set value, it includes, for example: calculating the density of the tower kettle waste liquid based on the current static pressure difference of the certain tower kettle liquid level measured by the air blowing type liquid level meter; and determining whether the calculated concentration of the tower bottom waste liquid is within a second preset range of the preset concentration set value through the density of the waste liquid.
At step 208, the control device 110 adjusts the opening of the feed regulating valve on the waste liquid feed line, based on the obtained current liquid level of the tower still waste liquid, the flow rate of the secondary steam, and the waste liquid feed flow rate, so that the difference between the current liquid level of the tower still waste liquid and the predetermined first liquid level is within a first predetermined range, the waste liquid feed line being disposed between the feed pump and the waste liquid preheater. For example, the waste liquid feeding line is arranged between the feeding pump and a primary preheater of the waste liquid preheater.
Regarding a method of determining the opening degree of a feed regulating valve on a waste liquid feed line, it includes, for example: the control device 110 determines whether the difference value between the current liquid level of the tower bottom waste liquid of the evaporation tower and a preset first liquid level is within a first preset range, wherein the current liquid level of the tower bottom waste liquid is measured by an air blowing type liquid level meter; if the control device 110 determines that the difference value between the current liquid level of the tower bottom waste liquid of the evaporation tower and the predetermined first liquid level is not within the first predetermined range, determining the opening degree of the feeding regulating valve 132 through PID calculation based on the acquired current liquid level of the tower bottom waste liquid, the flow rate of the secondary steam, and the waste liquid feeding flow rate; and adjusting a valve positioner 138 of the feeding adjusting valve based on the determined opening degree of the feeding adjusting valve 132 so that the difference value between the current liquid level of the tower bottom waste liquid and the preset first liquid level is within a first preset range. Specifically, as shown in fig. 1, a primary loop is formed by a first liquid level meter 150 obtaining liquid level signal feedback of tower still waste liquid, a feedforward control channel is formed by a second flow meter 154 obtaining flow signal of secondary steam output from the tower top of the evaporation tower, and a secondary loop is formed by a first flow meter 152 obtaining waste liquid feeding flow feedback, so as to reflect the regulation effect in time and rapidly eliminate spontaneous disturbance of feeding flow. The primary and secondary regulators are used in series so that the liquid level setpoint 164 of the evaporation column 140 is maintained at steady state. The current liquid level signal of the tower kettle waste liquid, the flow signal of the secondary steam, the coupling of the waste liquid feeding flow signal and the liquid level set value of the evaporation tower are used as the control set value of a valve positioner of the feeding regulating valve, and the opening degree of the feeding regulating valve is regulated.
For example, after the system is operated stably, the waste liquid feeding flow rate is controlled by controlling the opening degree of the feeding adjustment valve 132 during normal operation, so that the waste liquid feeding flow rate corresponds to the flow rate of the secondary steam, and the liquid level in the evaporation tower 140 is in a stable state. When the heat source of the system is suddenly changed or the flow rate of the secondary steam is changed, the evaporation amount is suddenly increased, that is, the flow rate of the secondary steam is suddenly increased. The pressure in the evaporation tower 140 is reduced, and the tower bottom waste liquid in the evaporation tower 140 is boiled violently, so that the liquid level rises rapidly, and at this time, false liquid level is easy to cause. Because the present disclosure incorporates a feed-forward disturbance of the flow of the secondary steam, the control set-point signal output by the control device 110 (e.g., without limitation, a PLC) to the valve positioner 138 of the charge-regulating valve is not increased, and therefore, the waste stream take-up flow is not significantly increased. Thus, the present disclosure can avoid the impact of false levels on system control.
In the scheme, the current liquid level and concentration of the tower bottom waste liquid of the evaporation tower, the flow of secondary steam output from the tower top of the evaporation tower, the feeding flow of the waste liquid, the tower bottom reflux flow of distillate and the discharge amount of concentrated solution are obtained through control equipment; controlling at least one of a concentrated solution discharge valve and a tower bottom reflux valve so that the tower bottom reflux flow of the distillate is matched with the discharge amount of the concentrated solution; this openly can effectively guarantee the material conservation of the tower cauldron reflux flow of the distillate of entering evaporating tower and the discharge of the concentrate of outflow evaporating tower to avoid because of the interference that the stranded feeding ejection of compact brought for liquid level control, reduce tower cauldron liquid level control's complexity. In addition, this disclosure is through the current liquid level based on the tower cauldron waste liquid that acquires, the flow of secondary steam, waste liquid material loading flow, confirms the aperture of the material loading governing valve on the waste liquid material loading pipeline to the current liquid level of tower cauldron waste liquid reaches predetermined first liquid level, accurate and the stable control of the tower cauldron waste liquid level of evaporating tower can be realized to this disclosure.
A method for matching the bottoms reflux flow of distillate to the discharge of concentrate in accordance with an embodiment of the present disclosure will be described below in conjunction with fig. 3 and 4. FIG. 4 illustrates a flow diagram of a method 400 for matching still reflux flow to concentrate discharge in accordance with an embodiment of the present disclosure. It should be understood that the method 400 may be performed, for example, at the electronic device 600 depicted in fig. 6. 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 device 110 determines whether the concentration of the column bottoms liquid waste is within a second predetermined range of the predetermined concentration set point.
At step 404, if the control device 110 determines that the concentration of the column bottoms liquid is within the second predetermined range of the predetermined concentration set point, the concentrate discharge valve 332 is maintained at the current opening. If the control device 110 determines that the concentration of the bottoms liquid is not within the predetermined range of the concentration set point, the opening of the concentrate discharge valve 332 is adjusted at step 412. After the concentration and the discharge amount of the waste liquid in the tower kettle reach set values, the concentrated liquid discharge valve is kept at the current opening, so that the concentration of the waste liquid in the tower kettle can not be obviously changed in the process of regulating the waste liquid in the tower kettle.
At step 406, the control apparatus 110 determines whether the difference between the bottoms reflux flow rate of distillate and the discharge of concentrate is greater than a predetermined threshold.
At step 408, if the control apparatus 110 determines that the difference between the still reflux flow rate of the distillate and the discharge amount of the concentrate is greater than the predetermined threshold value, the opening of the still reflux adjusting valve 318 on the still reflux line provided between the still and the overhead reflux line of the evaporation tower is adjusted via the valve positioner based on the difference between the still reflux flow rate of the distillate and the discharge amount of the concentrate.
At step 410, if the control apparatus 110 determines that the difference between the bottoms reflux flow rate of distillate and the discharge amount of concentrate is less than or equal to a predetermined threshold, it is determined that the bottoms reflux flow rate of distillate and the discharge amount of concentrate match.
In above-mentioned scheme, through after reaching the setting value at tower cauldron waste liquid concentration and emission, keep the aperture of concentrate discharge valve, the aperture of difference adjustment tower cauldron return flow governing valve between the emission of the tower cauldron return flow and the concentrate based on the distillate, this disclosure on the one hand can make and keep the material business turn over between the return flow of distillate and the emission of concentrate conservative, avoid the interference of stranded feeding ejection of compact to evaporation tower cauldron liquid level control, on the other hand is favorable to making the in-process of adjusting at tower cauldron waste liquid, can not make tower cauldron waste liquid concentration take place obvious change.
A method for controlling a reflux ratio of an evaporation tower according to an embodiment of the present disclosure will be described below with reference to fig. 3 and 5. Fig. 5 shows a flow diagram of a method 500 for controlling a reflux ratio of an evaporation tower, according to an embodiment of the present disclosure. It should be understood that the method 500 may be performed, for example, at the electronic device 600 depicted in fig. 6. 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 apparatus 110 determines whether the reflux ratio of the vaporization tower is within a third predetermined range of the reflux ratio set point.
At step 504, if the control apparatus 110 determines that the reflux ratio of the vaporization column is not within the third predetermined range of the reflux ratio set point, the opening of the overhead reflux valve is adjusted to control the flow of overhead reflux distillate such that the reflux ratio is within the third predetermined range of the reflux ratio set point.
At step 506, if the control apparatus 110 determines that the reflux ratio of the vaporization column is not within the predetermined range of the reflux ratio set point, the opening of the overhead reflux valve is adjusted.
In above-mentioned scheme, through when the reflux ratio reaches the reflux ratio setting value, the aperture of fixed top of the tower reflux valve, and then make tower cauldron backward flow and concentrate emission match through the aperture of regulation tower cauldron backflow governing valve, this disclosure does benefit to the stability of maintaining the reflux ratio in tower cauldron liquid level adjustment process.
FIG. 6 schematically illustrates a block diagram of an electronic device (or computing device) 600 suitable for use to implement embodiments of the present disclosure. The apparatus 600 may be an apparatus for implementing the methods 200, 400, 500 shown in fig. 2, 4 and 5. As shown in fig. 6, device 600 includes a Central Processing Unit (CPU)601 that may perform various appropriate actions and processes in accordance with computer program instructions stored in a Read Only Memory (ROM)602 or loaded from a storage unit 608 into a Random Access Memory (RAM) 603. In the RAM603, various programs and data required for the operation of the device 600 can also be stored. The CPU601, ROM 602, and RAM603 are connected to each other via a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
A number of components in the device 600 are connected to the I/O interface 605, including: an input unit 606, an output unit 607, a storage unit 608, a processing unit 601 performs the respective methods and processes described above, e.g. performing the methods 200, 400, 500. For example, in some embodiments, the methods 200, 400, 500 may be implemented as a computer software program stored on a machine-readable medium, such as the storage unit 608. In some embodiments, part or all of the computer program may be loaded and/or installed onto the device 600 via the ROM 602 and/or the communication unit 609. When the computer program is loaded into RAM603 and executed by CPU601, one or more of the operations of methods 200, 400, 500 described above may be performed. Alternatively, in other embodiments, the CPU601 may be configured by any other suitable means (e.g., by way of firmware) to perform one or more acts of the methods 200, 400, 500.
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 (9)
1. A method for controlling a liquid level in a column bottom of a waste liquid heat pump evaporation system, the waste liquid heat pump evaporation system at least comprises an evaporation tower, a waste liquid tank, a reboiler and a control device, waste liquid in the waste liquid tank is sent to the evaporation tower and the reboiler after passing through a feeding pump and a waste liquid preheater, at least part of distillate flows back to the evaporation tower through a column bottom backflow valve, and part of concentrate in the evaporation tower is discharged out of the evaporation tower through a concentrate discharge valve, the method comprises the following steps:
at a control device, acquiring the current liquid level and concentration of the tower kettle waste liquid of the evaporation tower, the flow of secondary steam output from the tower top of the evaporation tower and the feeding flow of the waste liquid;
obtaining the tower kettle reflux flow of distillate and the discharge amount of concentrated solution;
controlling at least one of a concentrated solution discharge valve and a tower bottom reflux valve so that the tower bottom reflux flow of the distillate is matched with the discharge amount of the concentrated solution; and
based on the current liquid level of tower cauldron waste liquid, the flow of secondary steam, the waste liquid material loading flow volume that acquire, the aperture of the material loading governing valve on the adjustment waste liquid material loading pipeline to the difference of the current liquid level of tower cauldron waste liquid and predetermined first liquid level is within first predetermined range, waste liquid material loading pipeline sets up between material loading pump and waste liquid preheater.
2. The method of claim 1, wherein controlling at least one of the concentrate discharge valve and the bottoms reflux valve such that the bottoms reflux flow rate of the distillate matches the discharge of the concentrate comprises:
determining whether the concentration of the tower bottom waste liquid is within a second preset range of a preset concentration set value; and
the concentrate discharge valve is maintained at the current opening in response to determining that the concentration of the column bottoms liquid waste is within a second predetermined range of the predetermined concentration set point.
3. The method of claim 2, wherein determining whether the concentration of column bottoms liquid is within a second predetermined range of the predetermined concentration setpoint comprises:
calculating the density of the tower kettle waste liquid based on the current static pressure difference of the certain tower kettle liquid level measured by the air blowing type liquid level meter; and
and determining whether the calculated concentration of the tower bottom waste liquid is within a second preset range of the preset concentration set value or not through the density of the waste liquid.
4. The method of claim 2, wherein controlling at least one of the concentrate discharge valve and the bottoms reflux valve such that the bottoms reflux flow rate of the distillate matches the discharge of the concentrate further comprises:
determining whether the difference between the tower bottom reflux flow of the distillate and the discharge amount of the concentrated solution is larger than a preset threshold value;
adjusting, via a valve positioner, an opening of a column bottom reflux adjusting valve on a column bottom reflux line disposed between a column bottom and a column top reflux line of an evaporation column, based on a difference between a column bottom reflux flow of distillate and a discharge amount of concentrate in response to determining that the difference between the column bottom reflux flow of the distillate and the discharge amount of the concentrate is greater than a predetermined threshold; and
determining that the bottoms reflux flow rate of the distillate matches the draw off of the concentrate in response to determining that the difference between the bottoms reflux flow rate of the distillate and the draw off of the concentrate is less than or equal to a predetermined threshold.
5. The method of claim 1, wherein adjusting the opening of the feed adjustment valve on the waste liquid feed line so that the difference between the current level of column bottoms waste liquid and the predetermined first level is within a first predetermined range comprises:
determining whether the difference value of the current liquid level of the tower bottom waste liquid of the evaporation tower and a preset first liquid level is within a first preset range, wherein the current liquid level of the tower bottom waste liquid is measured by an air blowing type liquid level meter;
in response to determining that the difference value between the current liquid level of the tower bottom waste liquid of the evaporation tower and a preset first liquid level is not within a first preset range, determining the opening degree of a feeding adjusting valve through PID calculation based on the obtained current liquid level of the tower bottom waste liquid, the flow of secondary steam and the waste liquid feeding flow; and
and adjusting a valve positioner of the feeding adjusting valve based on the determined opening degree of the feeding adjusting valve so that the difference value between the current liquid level of the tower bottom waste liquid and the preset first liquid level is within a first preset range.
6. The method of claim 1, further comprising:
determining whether the reflux ratio of the vaporization tower is within a third predetermined range of the reflux ratio set point; and
in response to determining that the reflux ratio of the vaporization column is not within a third predetermined range of the reflux ratio set point, adjusting the opening of the overhead reflux valve to control the flow of overhead reflux distillate to bring the reflux ratio within the third predetermined range of the reflux ratio set point.
7. A waste liquid heat pump evaporation system, comprising:
a waste liquid tank for storing waste liquid, wherein the waste liquid in the waste liquid tank is sent to the evaporation tower and the reboiler through the feeding regulating valve and the waste liquid preheater;
the evaporation tower is used for carrying out evaporation operation on the waste liquid in the evaporation tower so as to generate secondary steam and concentrated liquid;
a concentrate discharge valve disposed on the concentrate discharge line for causing the generated concentrate to be discharged out of the evaporation tower via the concentrate discharge valve;
the tower kettle return valve is arranged on the tower kettle return line and used for enabling at least part of distillate to flow back to the evaporation tower through the tower kettle return valve, and the concentrated solution discharge line and the tower kettle return line are communicated with the bottom of the evaporation tower;
the reboiler is used for providing heat for the bottom of the evaporation tower; and
a control device comprising at least one processing unit and at least one memory coupled to the at least one processing unit and storing instructions for execution by the at least one processing unit, which when executed by the at least one processing unit, cause the computing device to perform the method of any of claims 1 to 6.
8. A control 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 control device to perform the method of any of claims 1-6.
9. 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 6.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115400444A (en) * | 2022-08-05 | 2022-11-29 | 万华化学（宁波）有限公司 | Rectifying tower control method, storage medium and electronic equipment |
| CN115400444B (en) * | 2022-08-05 | 2024-02-27 | 万华化学（宁波）有限公司 | Rectifying tower control method, storage medium and electronic equipment |
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| Publication number | Publication date |
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| CN114014395B (en) | 2024-03-29 |
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