CN113669956A - Adjustable generator and control method thereof - Google Patents

Adjustable generator and control method thereof Download PDF

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Publication number
CN113669956A
CN113669956A CN202110881545.8A CN202110881545A CN113669956A CN 113669956 A CN113669956 A CN 113669956A CN 202110881545 A CN202110881545 A CN 202110881545A CN 113669956 A CN113669956 A CN 113669956A
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generator unit
generator
solution
chilled water
steam
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CN113669956B (en
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孙晗
郑越
王鲁宁
刘忠宝
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Beijing University of Technology
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Beijing University of Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B33/00—Boilers; Analysers; Rectifiers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/04—Arrangement or mounting of control or safety devices for sorption type machines, plants or systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00—Adapting or protecting infrastructure or their operation
    • Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/62—Absorption based systems

Abstract

The invention provides an adjustable generator and a control method thereof, wherein the generator comprises a first generator unit and a second generator unit which are arranged in parallel, the volume of the first generator unit is smaller than that of the second generator unit, so that the first generator unit and the second generator unit have heating solutions with different volumes, and the first generator unit and the second generator unit independently operate according to the actual load of a refrigeration system and selectively perform on-off control on the generators with the corresponding heating solutions. According to the invention, by arranging the two generators with different sizes in parallel, when the actual load of the refrigeration system is smaller, the generator filled with a proper amount of heating solution is automatically selected to work independently, and under the condition that the steam heating pipeline is immersed in the heating solution, the solution amount to be heated is greatly reduced, so that the heat supply amount of the generator is reduced, the energy efficiency ratio of the unit is effectively improved, and a remarkable energy-saving effect is achieved.

Description

Adjustable generator and control method thereof
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to an adjustable generator and a control method thereof.
Background
The main equipment of the absorption refrigerator is: generator, condenser, evaporator, absorber, throttle mechanism, solution heat exchanger, solution pump, etc. In the generator, the lower concentration aqueous lithium bromide solution is heated to evaporate water from the solution and concentrate the solution. The concentrated solution is sent to an absorber, and the water vapor enters a condenser to be condensed into refrigerant water. The refrigerant water is depressurized by the throttling mechanism, enters the evaporator to be evaporated and absorb heat to prepare cold energy, and then is absorbed by the solution in the absorber.
When the external load changes, the outlet water temperature of the chilled water changes correspondingly, and each actuator acts to adjust the solution circulation volume entering the generator, the flow of high-temperature water or heating steam of the generator, the cooling water volume and the refrigerant spraying volume respectively. The actuator generally adopts an electric regulating valve, and the solution pump, the refrigerant pump and the cold water pump also adopt frequency converters, and the frequency of the frequency converters is regulated according to the load change to change the solution circulation volume, the refrigerant flow volume and the cold water flow volume, so that the outlet temperature of the chilled water is kept in a set range when the load changes.
In the existing absorption water chilling unit or heat pump, the generator is mostly immersed, namely a heating coil is immersed in a solution, and a partition plate is not arranged in the generator. If the load is very small, the circulation amount of the required solution is very small, and the situation that the solution cannot submerge the heating coil can occur, so that the coil is easy to damage, the safety of equipment is not facilitated, and the effective heat exchange in the generator is also influenced. In order to avoid such a situation, four liquid level sensors with different lengths are arranged in a general generator, and respectively represent that the liquid level is too high, the liquid level is low and the liquid level is too low. When the liquid level is too high, the solution regulating valve is quickly closed, when the liquid level is too low, the solution regulating valve is quickly opened, and the liquid level is between high and low, the solution regulating valve is still, when the liquid level is between high and too high, the regulating valve is slowly closed, and when the liquid level is low and too low, the solution regulating valve is slowly opened. Therefore, the liquid level is controlled, the actual circulation volume of the solution can be far larger than the solution circulation volume determined according to the load size at low load, so that the circulation volume of the solution is also large enough to ensure that the heating coil is immersed in the solution at low load, the generator needs to heat all the solution to raise the temperature and generate required amount of refrigerant steam after the solution is boiled, the heat supply amount of the generator is also large when the load is small, and the energy efficiency ratio of the unit is reduced.
Disclosure of Invention
The invention provides an adjustable generator and a control method thereof, which are used for solving the defect of low system energy efficiency caused by large solution heating amount when a refrigeration system is low in load in the prior art, realizing high energy efficiency ratio of the refrigeration system and improving the energy-saving effect.
The invention provides an adjustable generator, which comprises a first generator unit and a second generator unit which are arranged in parallel, wherein the input ends of the first generator unit and the second generator unit are connected with a solution input pipeline, the output ends of the first generator unit and the second generator unit are connected with a solution output pipeline, the first generator unit and the second generator unit are provided with a refrigerant vapor output pipeline, the heat exchange pipelines of the first generator unit and the second generator unit are connected with a steam heating pipeline, and the first generator unit and the second generator unit are configured to selectively operate according to the actual load of a refrigeration system.
According to the adjustable generator provided by the invention, the solution input pipeline comprises a first solution input pipeline connected with the first generator unit and a second solution input pipeline connected with the second generator unit, a first solution regulating valve is arranged on the first solution input pipeline, and a second solution regulating valve is arranged on the second solution input pipeline.
According to the adjustable generator provided by the invention, the steam heating pipeline comprises a first steam heating pipeline connected with the heat exchange side of the first generator unit and a second steam heating pipeline connected with the heat exchange side of the second generator unit, the first steam heating pipeline is provided with a first steam regulating valve and a first steam electromagnetic valve, and the second steam heating pipeline is provided with a second steam regulating valve and a second steam electromagnetic valve.
According to the adjustable generator provided by the invention, a plurality of liquid level sensors with different heights are respectively arranged in the first generator unit and the second generator unit, and the first solution regulating valve and the second solution regulating valve control the solution amount of the solution input pipeline according to the liquid level information of the liquid level sensors, so that the steam heating pipelines in the first generator unit and the second generator unit are completely immersed in the solution.
According to the adjustable generator provided by the invention, the steam heating pipeline is arranged in a winding way in the first generator unit and the second generator unit.
According to the adjustable generator provided by the invention, the volume of the first generator unit is one half of the volume of the second generator unit.
The invention also provides a control method of the adjustable generator, which comprises the following steps:
acquiring the actual temperature of a chilled water inlet of an evaporator in a refrigeration system;
presetting the outlet temperature of chilled water;
acquiring the actual load of the refrigeration system;
sectionally setting a rated load range of the refrigeration system into a first threshold range, a second threshold range and a third threshold range;
if the actual load is within the first threshold range, the first generator unit works, and the second generator unit is closed;
if the actual load is within the second threshold range, the first generator unit is closed, and the second generator unit works;
and if the actual load is within the third threshold range, the first generator unit and the second generator unit work together.
According to the control method of the adjustable generator provided by the invention, the step of acquiring the actual load of the absorption refrigeration system comprises the following steps:
acquiring the actual load of the absorption refrigeration system according to the actual temperature of the chilled water inlet and the preset chilled water outlet temperature:
Figure BDA0003192540590000031
wherein c is the specific heat capacity of water,
Figure BDA0003192540590000041
for chilled water flow, T1Is the actual temperature of the chilled water inlet, TsIs the preset chilled water outlet temperature.
The control method of the adjustable generator provided by the invention further comprises the following steps:
acquiring the actual temperature of a chilled water outlet of an evaporator in the refrigeration system;
and adjusting the flow of the steam heating pipeline according to the difference value between the actual temperature of the chilled water outlet and the preset chilled water outlet temperature.
According to the control method of the adjustable generator provided by the invention, the first threshold range, the second threshold range and the third threshold range are equal.
The invention provides an adjustable generator and a control method thereof, wherein a first generator unit and a second generator unit are arranged in parallel, and the first generator unit and the second generator unit are arranged to selectively operate according to the actual load of a refrigeration system. Comparing the actual load of the refrigerating system with the rated load, and when the ratio of the actual load to the rated load is smaller than the ratio of the volume of the first generator unit to the total volume of the two generators, operating the first generator and closing the second generator; when the ratio of the actual load to the rated load is smaller than the ratio of the volume of the second generator unit to the total volume of the two generators, the first generator is closed, and the second generator works; when the ratio of the actual load to the rated load is greater than the ratio of the volume of the second generator unit to the total volume of the two generators, the first generator and the second generator work together. Therefore, when the actual load of the refrigerating system is small, the generator filled with a proper amount of heating solution is automatically selected to work independently, the solution amount is greatly reduced under the condition that the steam heating pipeline is immersed in the heating solution, the heat supply amount of the generator is reduced, the energy efficiency ratio of the unit is effectively improved, and the remarkable energy-saving effect is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic view of an adjustable generator and refrigeration system connection provided by the present invention;
FIG. 2 is a schematic diagram of the adjustable generator level control provided by the present invention;
FIG. 3 is a flow chart of a method for controlling an adjustable generator provided by the present invention;
reference numerals:
1: a first generator unit; 11: a liquid level sensor; 100: a controller;
2: a second generator unit;
3: a solution input line; 31: a first solution input line; 311: a first solution regulating valve;
32: a second solution input line; 321: a second solution regulating valve; 33: a solution output line;
4: a steam heating pipeline; 401: a steam main valve; 41: a first steam heating line; 411: a first steam solenoid valve; 412: a first steam regulating valve; 42: a second steam heating line;
421: a second steam solenoid valve; 422: a second steam regulating valve;
5: a condenser; 51: a refrigerant vapor output line; 52: a cooling water line;
6: an evaporator; 61: a chilled water inlet; 62: a first temperature sensor; 63: a refrigerant pump;
64: a flow meter; 65: a second temperature sensor; 66: a chilled water outlet;
7: an absorber; 71: a solution pump;
8: a condensate heat exchanger;
9: a solution heat exchanger.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1-2, embodiments of the present invention provide an adjustable generator for use in an absorption chiller system. The absorption chiller system also includes a condenser 5, an evaporator 6, an absorber 7, a solution heat exchanger 9, and the like.
The generator comprises a first generator unit 1 and a second generator unit 2, the first generator unit 1 and the second generator unit 2 being arranged in parallel. The solution input pipeline 3 is connected to the input ends of the first generator unit 1 and the second generator unit 2, specifically, the solution input pipeline 3 includes a first solution input pipeline 31 connected to the first generator unit 1 and a second solution input pipeline 32 connected to the second generator unit 2, the first solution input pipeline 31 is provided with a first solution regulating valve 311, and the second solution input pipeline 32 is provided with a second solution regulating valve 321. The first solution regulating valve 311 and the second solution regulating valve 321 are used to control the amounts of heating solutions in the first generator unit 1 and the second generator unit 2, respectively.
The output ends of the first generator unit 1 and the second generator unit 2 are connected with a solution output pipeline 33, the solution input pipeline 3 and the solution output pipeline 33 are respectively connected with two heat exchange sides of the solution heat exchanger 9, the output end of the solution output pipeline 33 is connected to the input end of the absorber 7, the solution input pipeline 3 penetrates through the heat exchange side of the condensate heat exchanger 8 and is connected to the output end of the absorber 7, and a solution pump 71 is arranged on the solution input pipeline 3 at the output end of the absorber 7.
The heat exchange sides of the first generator unit 1 and the second generator unit 2 are connected with a steam heating pipeline 4, and the steam heating pipeline 4 comprises a first steam heating pipeline 41 connected with the heat exchange side of the first generator unit 1 and a second steam heating pipeline 42 connected with the heat exchange side of the second generator unit 2. The steam heating pipeline 4 is provided with a main steam valve 401, the first steam heating pipeline 41 is provided with a first steam electromagnetic valve 411 and a first steam regulating valve 412, and the first steam electromagnetic valve 411 and the first steam regulating valve 412 are used for respectively controlling the opening and closing of the steam of the first steam heating pipeline 41; the second steam heating pipeline 42 is provided with a second steam solenoid valve 421 and a second steam regulating valve 422, and the second steam solenoid valve 421 and the second steam regulating valve 422 are used for respectively controlling the opening and closing of the steam in the second steam heating pipeline 42.
The first steam heating line 41 and the second steam heating line 42 are provided in a winding manner in the first generator unit 1 and the second generator unit 2, respectively, to increase the contact area with the heating solution in the generators. A first steam heating line 41 and a second steam heating line 42 extend from the generator and are connected to the condensate heat exchanger 8.
The first generator unit 1 and the second generator unit 2 are provided with a refrigerant vapor output line 51, the refrigerant vapor output line 51 being connected to a condenser 5 in the absorption chiller system, the condenser 5 being connected to an absorber 7 through a cooling water line 52. The refrigerant steam output pipeline 51 sends the water steam into the condenser 5 to be condensed into refrigerant water, the condenser 5 is connected to the evaporator 6 through a U-shaped pipe for pressure reduction, and the refrigerant water enters the evaporator 6 for evaporation and heat absorption to prepare cold energy after pressure reduction. The evaporator 6 is connected with the absorber 7, the concentrated solution in the absorber 7 absorbs the refrigerant vapor and then becomes a dilute solution, and the dilute solution is boosted by the solution pump 71 and returns to the solution input pipeline 3, so that the circulation of the refrigeration system is realized.
In this embodiment, a first temperature sensor 62 is disposed at the chilled water inlet 61 of the evaporator 6 for detecting the actual inlet water temperature T at the chilled water inlet 611. A second temperature sensor 62 is provided at the chilled water outlet 66 of the evaporator 6 for detecting the actual leaving water temperature T at the chilled water outlet 662. A flow meter 64 is further provided at the chilled water outlet 66 of the evaporator 6 for measuring the flow rate of the chilled water at the chilled water outlet 66
Figure BDA0003192540590000072
. A refrigerant pump 63 is also arranged on the pipeline at the output end of the evaporator 6.
It should be noted that in the present embodiment, the volume of the first generator unit 1 is smaller than the volume of the second generator unit 2. Preferably, the present embodiment sets the volume of the first generator unit 1 to be one-half of the volume of the second generator unit 2. Generators with different volumes are matched with corresponding steam electromagnetic valves, and the on-off action of the corresponding generators can be controlled by heating the solution according to the actual load of the refrigeration system.
When in use, the ideal temperature of the chilled water outlet 66 is set to be TsCalculating the actual load of the absorption unit in real time
Figure BDA0003192540590000071
And comparing the actual load Q1 with the rated load Q of the unit, if 2/3Q<Q1 is less than or equal to Q, the first steam solenoid valve 411 and the second steam solenoid valve 421 are opened, and the first generator unit 1 and the second generator unit 2 operate; if 1/3Q<Q1 is not less than 2/3Q, the second steam electromagnetic valve 421 is opened, the first steam electromagnetic valve 411 is closed, the second generator unit 2 operates, and the first generator unit 1 is closed; if Q1 is not more than 1/3Q, the first steam solenoid valve 411 is opened, the second steam solenoid valve 421 is closed, the first generator unit 1 is operated, and the second generator unit 2 is closed. Therefore, when the actual load Q1 of the refrigerating system is small, the generator filled with a proper amount of heating solution works independently, the amount of the solution required to be heated by the refrigerant is greatly reduced under the condition that the steam heating pipeline is immersed in the heating solution, the heat supply amount of the generator is reduced, the energy efficiency ratio of the unit is effectively improved, and the remarkable energy-saving effect is achieved.
Further, in the present embodiment, a plurality of liquid level sensors 11 with different heights are respectively disposed inside the first generator unit 1 and the second generator unit 2, and the liquid level sensors 11, the first solution regulating valve 311, and the second solution regulating valve 321 are electrically connected to the controller 100. The first and second solution regulating valves 311 and 321 control the solution output amount of the solution input line 3 according to the level information of the different level sensors 11 so that the steam heating lines 4 in the first and second generator units 1 and 2 are completely submerged in the solution.
Specifically, four liquid level sensors 11 with different lengths are respectively arranged in the first generator unit 1 and the second generator unit 2 and respectively represent that the liquid level is too high, the liquid level is low and the liquid level is too low. The solution governing valve that each generator corresponds when the liquid level is too high is closed fast, the liquid level crosses the solution governing valve that each generator corresponds and opens fast when low, the liquid level is in between high and low, the solution governing valve that each generator corresponds is motionless, the liquid level is in between high and high, the solution governing valve that each generator corresponds closes at a slow speed, the liquid level is in low and crosses the solution governing valve that each generator corresponds and opens at a slow speed when low, guarantee that the solution in first generator unit 1 and the second generator unit 2 can both submerge steam heating pipeline 4 completely, further guaranteed that the generator heats also can submergence steam heating pipeline 4 for a small amount of solution under the less condition of load, guarantee the normal operating of generator.
As shown in fig. 3, an embodiment of the present invention further provides a method for controlling an adjustable generator, where the method is implemented by the generator of the above embodiment, and specifically includes the following steps:
step 1: the actual temperature at the evaporator chilled water inlet 61 in the refrigeration system is obtained.
In this step, the actual inlet water temperature T at the chilled water inlet 61 is detected by providing a first temperature sensor 62 at the chilled water inlet 61 of the evaporator 61。
Step 2: the chilled water outlet temperature is preset. Setting the ideal temperature of the chilled water outlet 66 to Ts。
And step 3: and acquiring the actual load of the refrigeration system.
In this step, the actual temperature T of the chilled water inlet 61 is determined1And presetting the outlet temperature T of the chilled watersAcquiring the actual load of the absorption refrigeration system:
Figure BDA0003192540590000091
wherein c is the specific heat capacity of water,
Figure BDA0003192540590000092
for chilled water flow, T1Is the actual temperature of the chilled water inlet, TsThe chilled water outlet temperature is preset.
And 4, step 4: the rated load Q range of the refrigeration system is segmented into a first threshold range, a second threshold range, and a third threshold range.
In the present embodiment, the volume of the first generator unit 1 is designed to be one-half of the volume of the second generator unit 2, and therefore, the first threshold range, the second threshold range and the third threshold range are equal, the first threshold range is 0 to 1/3Q, the second threshold range is 1/3Q to 2/3Q, and the third threshold range is 2/3Q to Q.
The actual load Q1 is compared with the nominal load Q:
if the actual load Q1 is within the first threshold range, i.e., Q1 is equal to or less than 1/3Q, the first steam solenoid valve 411 is opened, the second steam solenoid valve 421 is closed, the first generator unit 1 is operated, and the second generator unit 2 is closed.
If the actual load Q1 is within the second threshold range, i.e., 1/3Q < Q1 ≦ 2/3Q, the second steam solenoid valve 421 is opened, the first steam solenoid valve 411 is closed, the second generator unit 2 is operated, and the first generator unit 1 is closed.
If the actual load Q1 is in the third threshold range, i.e. 2/3Q < Q1Q, the first steam solenoid valve 411 and the second steam solenoid valve 421 are opened and the first generator unit 1 and the second generator unit 2 are operated together.
The three cases of using the first generator unit 1 alone, using the second generator unit 2 alone, and using the first generator unit 1 and the second generator unit 2 simultaneously correspond to three threshold ranges of the load, respectively.
Therefore, when the actual load Q1 of the refrigeration system is small, the first generator unit 1 and the second generator unit 2 can work independently, the amount of the solution required to be heated by the refrigerant is greatly reduced under the condition that the steam heating pipeline 4 is immersed in the heating solution, the heat supply amount of the generator is reduced, the energy efficiency ratio of the unit is effectively improved, and the remarkable energy-saving effect is achieved. The method is particularly suitable for the working condition that the actual load of the refrigerating system is less than the rated load of 2/3.
Further, the method of the present embodiment further includes the step of obtaining the actual temperature of the chilled water outlet 66 of the evaporator 6 in the refrigeration system.
Specifically, in this step, the actual leaving water temperature T at the chilled water outlet 66 is detected by providing the second temperature sensor 65 at the chilled water outlet 66 of the evaporator 62. According to the actual temperature T of the chilled water outlet 662And the preset outlet temperature T of the chilled watersThe difference value of (a) adjusts the flow rate of the steam heating line 4.
The solution pump 71 adopts a frequency converter, and the difference T between the outlet temperature of the chilled water of the evaporator 6 and the set temperature of the chilled water outlet is used as the reference2-TsThe frequency converter frequency was determined to vary the solution circulation volume. According to the difference T between the outlet temperature of the chilled water of the evaporator 6 and the set temperature of the chilled water outlet2-TsThe opening degree of an electric regulating valve on a steam pipeline with the opened steam electromagnetic valve is regulated, the frequency converter is electrically connected with the first steam regulating valve 412 and the second steam regulating valve 422, and the frequency converter regulates the heating quantity of the generator by controlling the opening degrees of the first steam regulating valve 412 and the second steam regulating valve 422. The heat supply load of the generator is further reduced, the energy efficiency ratio of the unit is effectively improved, and the remarkable energy-saving effect is achieved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (10)

1. An adjustable generator, comprising a first generator unit and a second generator unit arranged in parallel, wherein the input ends of the first generator unit and the second generator unit are connected with a solution input pipeline, the output ends of the first generator unit and the second generator unit are connected with a solution output pipeline, the first generator unit and the second generator unit are provided with a refrigerant vapor output pipeline, the heat exchange pipelines of the first generator unit and the second generator unit are connected with a steam heating pipeline, and the first generator unit and the second generator unit are configured to selectively operate according to the actual load of a refrigeration system.
2. The adjustable generator of claim 1, wherein the solution input line comprises a first solution input line connected to the first generator unit and a second solution input line connected to the second generator unit, the first solution input line having a first solution regulating valve disposed thereon, the second solution input line having a second solution regulating valve disposed thereon.
3. The adjustable generator according to claim 1, wherein the steam heating pipeline comprises a first steam heating pipeline connected to the heat exchanging side of the first generator unit and a second steam heating pipeline connected to the heat exchanging side of the second generator unit, the first steam heating pipeline is provided with a first steam regulating valve and a first steam solenoid valve, and the second steam heating pipeline is provided with a second steam regulating valve and a second steam solenoid valve.
4. The adjustable generator of claim 2, wherein a plurality of liquid level sensors with different heights are respectively arranged inside the first generator unit and the second generator unit, and the first solution regulating valve and the second solution regulating valve control the solution amount of the solution input pipeline according to the liquid level information of the liquid level sensors, so that the steam heating pipelines in the first generator unit and the second generator unit are completely immersed in the solution.
5. The adjustable generator of claim 1, wherein the steam heating circuit is circuitous within the first generator unit and the second generator unit.
6. The adjustable generator of any one of claims 1-5, wherein the volume of the first generator unit is one-half of the volume of the second generator unit.
7. A method of controlling an adjustable generator, comprising:
acquiring the actual temperature of a chilled water inlet of an evaporator in a refrigeration system;
presetting the outlet temperature of chilled water;
acquiring the actual load of the refrigeration system;
sectionally setting a rated load range of the refrigeration system into a first threshold range, a second threshold range and a third threshold range;
if the actual load is within the first threshold range, the first generator unit works, and the second generator unit is closed;
if the actual load is within the second threshold range, the first generator unit is closed, and the second generator unit works;
and if the actual load is within the third threshold range, the first generator unit and the second generator unit work together.
8. The method of controlling an adjustable generator according to claim 7, wherein the step of obtaining the actual load of the absorption refrigeration system comprises:
acquiring the actual load of the absorption refrigeration system according to the actual temperature of the chilled water inlet and the preset chilled water outlet temperature:
Figure FDA0003192540580000021
wherein c is the specific heat capacity of water,
Figure FDA0003192540580000022
for chilled water flow, T1Is the actual temperature of the chilled water inlet, TsIs the preset chilled water outlet temperature.
9. The method of controlling an adjustable generator according to claim 7, further comprising:
acquiring the actual temperature of a chilled water outlet of an evaporator in the refrigeration system;
and adjusting the flow of the steam heating pipeline according to the difference value between the actual temperature of the chilled water outlet and the preset chilled water outlet temperature.
10. The method of controlling an adjustable generator according to any one of claims 7-9, wherein the first threshold range, the second threshold range, and the third threshold range are equal.
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CN210861790U (en) * 2019-10-28 2020-06-26 天津商业大学 Double-generator continuous refrigeration injection type refrigeration system
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