CN115127246A - Water chiller energy-saving system and method controlled by frequency converter - Google Patents
Water chiller energy-saving system and method controlled by frequency converter Download PDFInfo
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- CN115127246A CN115127246A CN202110779432.7A CN202110779432A CN115127246A CN 115127246 A CN115127246 A CN 115127246A CN 202110779432 A CN202110779432 A CN 202110779432A CN 115127246 A CN115127246 A CN 115127246A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 282
- 238000000034 method Methods 0.000 title claims abstract description 16
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000001257 hydrogen Substances 0.000 claims abstract description 64
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 64
- 239000007789 gas Substances 0.000 claims abstract description 37
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 33
- 238000009792 diffusion process Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- 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
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
-
- 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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the field of cold water system adjustment, and provides a frequency converter controlled energy-saving system and a frequency converter controlled energy-saving method for a water chiller, wherein the frequency converter controlled energy-saving system comprises the following steps: the system comprises a gas supply unit, a hydrogen compressor, a first cold water unit, a second cold water unit, a heat exchanger, a hydrogenation machine, a diffusion unit and a hydrogenation vehicle; the hydrogen supply unit is connected with the hydrogen compressor, the hydrogen compressor is connected with the first cold water unit, the hydrogen compressor is connected with the diffusing unit, the hydrogen compressor is connected with the heat exchanger, the heat exchanger is connected with the second cold water unit, the heat exchanger is connected with the hydrogenation machine, the hydrogenation machine is connected with the hydrogenation vehicle, and the hydrogenation machine is connected with the diffusing unit. According to the invention, the power of the water chilling unit is adjusted according to the water temperature difference between the water inlet and the water outlet of the water chilling unit and the load range of the guide vanes, so that the water chilling unit has obvious energy-saving effect in starting and running; the frequency converter is adopted to drive the water chilling unit, so that the running performance of the water chilling unit is improved, surging is prevented, and the flexibility of running adjustment is enhanced.
Description
Technical Field
The invention relates to the field of cold water system adjustment, in particular to a frequency converter controlled energy-saving system and a frequency converter controlled energy-saving method for a water chiller.
Background
At present, a general hydrogenation station adopts an air-cooled ethylene glycol chilled water unit special for an H2 cooling system, the chilled water unit adopts 380V50HZ alternating current three-phase power as power energy, and the overall power of the chilled water unit generally used in the hydrogenation station is 15 KW-260 KW due to the actual demand of the refrigerating capacity of the chilled water unit; during production and use, the chilled water unit runs along with the start and stop of the hydrogen booster compressor and the hydrogenation machine, and during the period, the chilled water unit runs at the fixed frequency of 50HZ all the time; when the outlet water temperature of the chilled water unit reaches a required value, the chilled water unit also operates at the frequency of fixed frequency 50 HZ; the large power consumption devices operate in this way for a long time, and the consumed electric energy is not small enough, which is also a waste in energy.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The main purpose of the invention is to solve the problem of H in the prior art 2 The technical problem of overlarge power consumption of the air-cooled glycol chilled water unit special for the cooling system.
In order to achieve the above object, the present invention provides an energy saving system for a water chiller controlled by a frequency converter, comprising: the system comprises a gas supply unit, a hydrogen compressor, a first cold water unit, a second cold water unit, a heat exchanger, a hydrogenation machine, a diffusion unit and a hydrogenation vehicle;
the hydrogen gas supply unit is connected with the hydrogen compressor, the hydrogen compressor is connected with the first cold water unit, a diffusing port of the hydrogen compressor is connected with a first inlet of the diffusing unit, a hydrogen outlet of the hydrogen compressor is connected with an air inlet of the heat exchanger, the heat exchanger is connected with the second cold water unit, an air outlet of the heat exchanger is connected with an air inlet of the hydrogenation machine, a filling port of the hydrogenation machine is connected with the hydrogenation vehicle, and a diffusing port of the hydrogenation machine is connected with a second inlet of the diffusing unit.
Preferably, the connection between the gas supply unit and the hydrogen compressor is specifically:
a nitrogen outlet of the gas supply unit is connected with one end of a first gas valve, and the other end of the first gas valve is connected with a nitrogen inlet of the hydrogen compressor;
and a hydrogen outlet of the gas supply unit is connected with one end of a second gas valve, and the other end of the second gas valve is connected with a hydrogen inlet of the hydrogen compressor.
Preferably, the first cold water unit includes: the water pump comprises a fourth water valve, a fifth water valve, a first temperature sensor, a second temperature sensor and a first water chilling unit;
the connection of the hydrogen compressor and the first cold water unit is specifically as follows:
a water outlet of the hydrogen compressor is connected with the second temperature sensor and one end of the fifth water valve, and the other end of the fifth water valve is connected with a water inlet of the first water chilling unit;
and a water inlet of the hydrogen compressor is connected with one ends of the first temperature sensor and the fourth water valve, and the other end of the fourth water valve is connected with a water outlet of the first water chilling unit.
Preferably, the first water chiller includes: the cooling system comprises a first frequency converter, a first cold water compressor, a first cooling fan, a first controller and first guide vanes;
the first controller is electrically connected with the first temperature sensor, the second temperature sensor, the first frequency converter and the first guide vanes, the frequency converter is electrically connected with the first cold water compressor, and the first cold water compressor is electrically connected with the first cooling fan.
Preferably, the second cold water unit includes: a sixth water valve, a seventh water valve, a third temperature sensor, a fourth temperature sensor and a second water chilling unit;
the hydrogen outlet of the hydrogen compressor is connected with the air inlet of the heat exchanger, and the heat exchanger is connected with the second cold water unit, specifically:
a hydrogen outlet of the hydrogen compressor is connected with one end of a third air valve, and the other end of the third air valve is connected with an air inlet of the heat exchanger;
a water outlet of the heat exchanger is connected with the fourth temperature sensor and one end of the seventh water valve, and the other end of the seventh water valve is connected with a water inlet of the second water chilling unit;
and a water inlet of the heat exchanger is connected with one ends of the third temperature sensor and the sixth water valve, and the other end of the sixth water valve is connected with a water outlet of the second water chilling unit.
Preferably, the second water chiller includes: the second frequency converter, the second cold water compressor, the second cooling fan, the second controller and the second guide vane;
the second controller is electrically connected with the third temperature sensor, the fourth temperature sensor, the second frequency converter and the second guide vanes, the frequency converter is electrically connected with the second cold water compressor, and the second cold water compressor is electrically connected with the second cooling fan.
Preferably, the connection between the gas outlet of the heat exchanger and the gas inlet of the hydrogenation unit is specifically as follows:
and the air outlet of the heat exchanger is connected with one end of an eighth air valve, and the other end of the eighth air valve is connected with the air inlet of the hydrogenation machine.
A frequency converter controlled energy-saving method for a water chiller is realized based on a frequency converter controlled energy-saving system for the water chiller and comprises the following steps:
s1: starting the energy-saving system of the water chiller controlled by the frequency converter, and setting the load range of the first guide vane in the first water chiller and the load range of the second guide vane in the second water chiller;
s2: the first temperature sensor detects the outlet water temperature T of the first water chilling unit in real time 1 The second temperature sensor detects the first cold in real timeWater inlet temperature T of water machine set 2 (ii) a The third temperature sensor detects the outlet water temperature T of the second water chilling unit in real time 3 The fourth temperature sensor detects the water inlet temperature T of the second water chilling unit in real time 4 ；
S3: according to the load range of the first guide vane and the outlet water temperature T of the first water chilling unit 1 And the inlet water temperature T of the first water chilling unit 2 Adjusting the working state of the first water chilling unit; according to the load range of the second guide vane and the outlet water temperature T of the second water chilling unit 3 And the inlet water temperature T of the second water chilling unit 4 And adjusting the working state of the second water chilling unit.
Preferably, step S3 is specifically:
s31: if the load range of the first guide vane is 70-100%, the first guide vane is fully opened; if the load range of the first guide vane is lower than 70%, the first guide vane starts to be closed, and when the load range of the first guide vane is 50%, the first guide vane is fully closed; the first cold water compressor starts to increase power if the load range of the first guide vane is lower than 50%, and the first cold water compressor increases to 130% at the maximum when the load range of the first guide vane is 20%;
if the water outlet temperature T is 1 Minus the inlet water temperature T 2 Is greater than a predetermined value T 5 If the current running power of the first cold water compressor is not 150%, the first cold water compressor works according to the current running power;
s32: if the load range of the second guide vane is 70-100%, the second guide vane is fully opened; if the load range of the second guide vane is lower than 70%, the second guide vane starts to be closed, and when the load range of the second guide vane is 50%, the second guide vane is fully closed; if the load range of the second guide vane is lower than 50%, the second cold water compressor starts to increase power, and when the load range of the second guide vane is 20%, the second cold water compressor is increased to 130% at most;
if the water outlet temperature T is 3 Minus the inlet water temperature T 4 Is greater than a predetermined value T 6 And if not, the second cold water compressor works according to the current operation power.
The invention has the following beneficial effects:
1. the power of the water chilling unit is adjusted according to the water temperature difference between the water inlet and the water outlet of the water chilling unit and the load range of the guide vanes, so that the water chilling unit has obvious energy-saving effect in starting and running;
2. the frequency converter is adopted to drive the water chilling unit, so that the running performance of the water chilling unit is improved, surging is prevented, and the flexibility of running adjustment is enhanced.
Drawings
FIG. 1 is a system block diagram of an embodiment of the present invention;
FIG. 2 is a flow chart of a method of an embodiment of the present invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the present invention provides a water chiller energy saving system controlled by a frequency converter, including: the system comprises a gas supply unit 13, a hydrogen compressor 14, a first cold water unit, a second cold water unit, a heat exchanger 17, a hydrogenation machine 19, a diffusion unit 16 and a hydrogenation vehicle 20;
the gas supply unit 13 is connected with the hydrogen compressor 14, the hydrogen compressor 14 is connected with the first cold water unit, a diffusing port of the hydrogen compressor 14 is connected with a first inlet of the diffusing unit 16, a hydrogen outlet of the hydrogen compressor 14 is connected with a gas inlet of the heat exchanger 17, the heat exchanger 17 is connected with the second cold water unit, a gas outlet of the heat exchanger 17 is connected with a gas inlet of the hydrogenation machine 19, a filling port of the hydrogenation machine 19 is connected with the hydrogenation vehicle 20, and a diffusing port of the hydrogenation machine 19 is connected with a second inlet of the diffusing unit 16.
In this embodiment, the connection between the gas supply unit 13 and the hydrogen compressor 14 specifically includes:
a nitrogen outlet of the gas supply unit 13 is connected with one end of a first gas valve 1, and the other end of the first gas valve 1 is connected with a nitrogen inlet of the hydrogen compressor 14;
the hydrogen outlet of the gas supply unit 13 is connected with one end of a second gas valve 2, and the other end of the second gas valve 2 is connected with the hydrogen inlet of the hydrogen compressor 14.
In this embodiment, the first cooling water unit includes: a fourth water valve 4, a fifth water valve 5, a first temperature sensor 9, a second temperature sensor 10 and a first water chilling unit 15;
the connection between the hydrogen compressor 14 and the first cold water unit is specifically as follows:
a water outlet of the hydrogen compressor 14 is connected with the second temperature sensor 10 and one end of the fifth water valve 5, and the other end of the fifth water valve 5 is connected with a water inlet of the first water chilling unit 15;
a water inlet of the hydrogen compressor 14 is connected with one ends of the first temperature sensor 9 and the fourth water valve 4, and the other end of the fourth water valve 4 is connected with a water outlet of the first water chilling unit 15.
In this embodiment, the first water chiller 15 includes: the cooling system comprises a first frequency converter, a first cold water compressor, a first cooling fan, a first controller and a first guide vane;
the first controller is electrically connected with the first temperature sensor 9, the second temperature sensor 10, the first frequency converter and the first guide vanes, the frequency converter is electrically connected with the first cold water compressor, and the first cold water compressor is electrically connected with the first cooling fan;
in the specific implementation, the first cold water compressor drives an impeller of the first cooling fan to rotate at a high speed through a speed-up gear by a motor inside the first cold water compressor, and centrifugal force generated by the high-speed rotation of the impeller compresses refrigerant gas and converts most kinetic energy of the gas into pressure energy; obviously, the energy obtained by the refrigerant gas from the impeller is finally input through the motor, and the input power of the motor satisfies the following relation:
P＝KDV/n
wherein P is the input power of the motor, D is the full pressure of the refrigerant gas, V is the volume flow of the refrigerant gas, n is the efficiency of the motor, and K is a calculation constant;
in the above formula, D is proportional to the square of the rotation speed of the motor, and V is proportional to the rotation speed of the motor, so that the power of the motor is proportional to the cube of the rotation speed of the motor, that is, the rotation speed is reduced, the power is greatly reduced, the efficiency of the first cold water compressor is improved, and the power consumption of the first cold water unit 15 is reduced; the first frequency converter optimizes the rotating speed of the motor and the opening degree of the first guide vane according to the water outlet temperature of the first water chilling unit 15 and the pressure head of the first water chilling compressor, so that the first water chilling unit 15 always operates in an optimal state area; the basic parameter controlled by the first frequency converter is the temperature difference between the actual value and the set value of the outlet water temperature of the cold water; when the first water chilling unit 15 operates under the full-load working condition, the first guide vane is fully opened, the motor completes temperature difference control according to speed logic, the rotating speed of the motor is reduced along with the reduction of the load, and the motor is controlled through the pressure head of the first cold water compressor and the minimum allowable rotating speed of the system until the rotating speed reaches the minimum; at the moment, the motor keeps the minimum rotating speed, and the rotating speed of the motor provides a signal for controlling the first guide vane so as to reduce the opening of the guide vane; as the load continues to drop, the speed signal from the first cold water compressor continues to close the first guide vane and further reduce the speed of the motor.
In this embodiment, the second water cooling unit includes: a sixth water valve 6, a seventh water valve 7, a third temperature sensor 11, a fourth temperature sensor 12 and a second water chilling unit 18;
the hydrogen outlet of the hydrogen compressor 14 is connected to the air inlet of the heat exchanger 17, and the heat exchanger 17 is connected to the second cold water unit, specifically:
a hydrogen outlet of the hydrogen compressor 14 is connected with one end of a third gas valve 3, and the other end of the third gas valve 3 is connected with an air inlet of the heat exchanger 17;
a water outlet of the heat exchanger 17 is connected with the fourth temperature sensor 12 and one end of the seventh water valve 7, and the other end of the seventh water valve 7 is connected with a water inlet of the second water chilling unit 18;
a water inlet of the heat exchanger 17 is connected with the third temperature sensor 11 and one end of the sixth water valve 6, and the other end of the sixth water valve 6 is connected with a water outlet of the second water chilling unit 18.
In this embodiment, the second water chiller 18 includes: the second frequency converter, the second cold water compressor, the second cooling fan, the second controller and the second guide vane;
the second controller is electrically connected with the third temperature sensor 11, the fourth temperature sensor 12, the second frequency converter and the second guide vane, the frequency converter is electrically connected with the second cold water compressor, and the second cold water compressor is electrically connected with the second cooling fan;
in a specific implementation, the working principle of the second water chiller 18 is the same as that of the first water chiller 15.
In this embodiment, the connection between the air outlet of the heat exchanger 17 and the air inlet of the hydrogenation unit 19 specifically includes:
an air outlet of the heat exchanger 17 is connected with one end of an eighth air valve 8, and the other end of the eighth air valve 8 is connected with an air inlet of the hydrogenation unit 19.
The invention provides a frequency converter controlled energy-saving method for a water chiller, which is realized based on the frequency converter controlled energy-saving system for the water chiller and comprises the following steps:
s1: starting the energy-saving system of the water chiller controlled by the frequency converter, and setting the load range of the first guide vane in the first water chiller 15 and the load range of the second guide vane in the second water chiller 18;
s2: the first temperature sensor 9 detects the water outlet temperature T of the first water chilling unit 15 in real time 1 Said second temperature is transmittedThe sensor 10 detects the inlet water temperature T of the first water chilling unit 15 in real time 2 (ii) a The third temperature sensor 11 detects the outlet water temperature T of the second water chilling unit 18 in real time 3 The fourth temperature sensor 12 detects the inlet water temperature T of the second water chilling unit 18 in real time 4 ；
S3: according to the load range of the first guide vane and the outlet water temperature T of the first water chilling unit 15 1 And the temperature T of the inlet water of the first water chilling unit 15 2 Adjusting the working state of the first water chilling unit 15; according to the load range of the second guide vane and the outlet water temperature T of the second water chilling unit 18 3 And the temperature T of the inlet water of the second water chilling unit 18 4 Adjusting the operating state of the second chiller 18.
In this embodiment, step S3 specifically includes:
s31: if the load range of the first guide vane is 70% -100%, the first guide vane is fully opened; if the load range of the first guide vane is lower than 70%, the first guide vane starts to be closed, and when the load range of the first guide vane is 50%, the first guide vane is fully closed; if the load range of the first guide vane is lower than 50%, in order to avoid surging, the first cold water compressor starts to increase power, and when the load range of the first guide vane is 20%, the first cold water compressor is increased to 130% at most, so that the operation range of the first cold water unit 15 can be effectively enlarged;
if the outlet water temperature T 1 Minus the inlet water temperature T 2 Is greater than a predetermined value T 5 If the current running power of the first cold water compressor is not less than 150%, the first cold water compressor works according to the current running power; preset value T 5 Can be specifically set according to actual conditions;
s32: if the load range of the second guide vane is 70% -100%, the second guide vane is fully opened; if the load range of the second guide vane is lower than 70%, the second guide vane starts to be closed, and when the load range of the second guide vane is 50%, the second guide vane is fully closed; if the load range of the second guide vane is lower than 50%, in order to avoid surging, the second cold water compressor starts to increase power, and when the load range of the second guide vane is 20%, the second cold water compressor is increased to 130% at most, so that the operation range of the second cold water unit 18 can be effectively enlarged;
if the water outlet temperature T is 3 Minus the inlet water temperature T 4 Is greater than a predetermined value T 6 If the current running power of the second cold water compressor is not 150%, the second cold water compressor works according to the current running power; preset value T 6 Can be specifically set according to actual conditions.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third and the like do not denote any order, but rather the words first, second and the like may be interpreted as indicating any order.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. The utility model provides a cold water machine economizer system of converter control which characterized in that includes: the system comprises an air supply unit (13), a hydrogen compressor (14), a first cold water unit, a second cold water unit, a heat exchanger (17), a hydrogenation machine (19), a diffusion unit (16) and a hydrogenation vehicle (20);
the hydrogen supply unit (13) is connected with the hydrogen compressor (14), the hydrogen compressor (14) is connected with the first cold water unit, the diffusing port of the hydrogen compressor (14) is connected with the first inlet of the diffusing unit (16), the hydrogen outlet of the hydrogen compressor (14) is connected with the air inlet of the heat exchanger (17), the heat exchanger (17) is connected with the second cold water unit, the air outlet of the heat exchanger (17) is connected with the air inlet of the hydrogenation machine (19), the filling port of the hydrogenation machine (19) is connected with the hydrogenation vehicle (20), and the diffusing port of the hydrogenation machine (19) is connected with the second inlet of the diffusing unit (16).
2. The inverter-controlled water chiller economizer system of claim 1 wherein the connection of the gas supply unit (13) to the hydrogen compressor (14) is specifically:
a nitrogen outlet of the gas supply unit (13) is connected with one end of a first gas valve (1), and the other end of the first gas valve (1) is connected with a nitrogen inlet of the hydrogen compressor (14);
the hydrogen outlet of the gas supply unit (13) is connected with one end of a second gas valve (2), and the other end of the second gas valve (2) is connected with the hydrogen inlet of a hydrogen compressor (14).
3. The inverter-controlled chiller economizer system of claim 1 wherein the first chiller unit comprises: a fourth water valve (4), a fifth water valve (5), a first temperature sensor (9), a second temperature sensor (10) and a first water chilling unit (15);
the connection of the hydrogen compressor (14) and the first cold water unit is specifically as follows:
the water outlet of the hydrogen compressor (14) is connected with the second temperature sensor (10) and one end of the fifth water valve (5), and the other end of the fifth water valve (5) is connected with the water inlet of the first water chilling unit (15);
the water inlet of the hydrogen compressor (14) is connected with one ends of the first temperature sensor (9) and the fourth water valve (4), and the other end of the fourth water valve (4) is connected with the water outlet of the first water chilling unit (15).
4. The inverter-controlled chiller economizer system of claim 3 wherein the first chiller (15) comprises: the cooling system comprises a first frequency converter, a first cold water compressor, a first cooling fan, a first controller and first guide vanes;
the first controller is electrically connected with the first temperature sensor (9), the second temperature sensor (10), the first frequency converter and the first guide vanes, the frequency converter is electrically connected with the first cold water compressor, and the first cold water compressor is electrically connected with the first cooling fan.
5. The inverter-controlled chiller economizer system of claim 1 wherein the second chiller unit comprises: a sixth water valve (6), a seventh water valve (7), a third temperature sensor (11), a fourth temperature sensor (12) and a second water chilling unit (18);
the hydrogen outlet of the hydrogen compressor (14) is connected with the air inlet of the heat exchanger (17), the heat exchanger (17) is connected with the second cold water unit, and the hydrogen outlet of the hydrogen compressor (14) is specifically as follows:
a hydrogen outlet of the hydrogen compressor (14) is connected with one end of a third air valve (3), and the other end of the third air valve (3) is connected with an air inlet of the heat exchanger (17);
a water outlet of the heat exchanger (17) is connected with one ends of the fourth temperature sensor (12) and the seventh water valve (7), and the other end of the seventh water valve (7) is connected with a water inlet of the second water chilling unit (18);
and a water inlet of the heat exchanger (17) is connected with one ends of the third temperature sensor (11) and the sixth water valve (6), and the other end of the sixth water valve (6) is connected with a water outlet of the second water chilling unit (18).
6. The inverter-controlled chiller economizer system of claim 5 wherein the second chiller (18) comprises: the second frequency converter, the second cold water compressor, the second cooling fan, the second controller and the second guide vane;
the second controller is electrically connected with the third temperature sensor (11), the fourth temperature sensor (12), the second frequency converter and the second guide vanes, the frequency converter is electrically connected with the second cold water compressor, and the second cold water compressor is electrically connected with the second cooling fan.
7. The frequency converter controlled water chiller energy saving system according to claim 1, wherein the connection between the air outlet of the heat exchanger (17) and the air inlet of the hydrogenation unit (19) is specifically:
the air outlet of the heat exchanger (17) is connected with one end of an eighth air valve (8), and the other end of the eighth air valve (8) is connected with the air inlet of the hydrogenation machine (19).
8. An energy-saving method of a water chiller controlled by a frequency converter is realized based on the energy-saving system of the water chiller controlled by the frequency converter according to any one of claims 1 to 7, and is characterized by comprising the following steps:
s1: starting the energy-saving system of the water chiller controlled by the frequency converter, and setting the load range of the first guide vane in the first water chiller (15) and the load range of the second guide vane in the second water chiller (18);
s2: the first temperature sensor (9) detects the water outlet temperature T of the first water chilling unit (15) in real time 1 The second temperature sensor (10) detects the water inlet temperature T of the first water chilling unit (15) in real time 2 (ii) a The third temperature sensor (11) detects the water outlet temperature T of the second water chilling unit (18) in real time 3 The fourth temperature sensor (12) detects the water inlet temperature T of the second water chilling unit (18) in real time 4 ；
S3: according to the load range of the first guide vane and the outlet water temperature T of the first water chilling unit (15) 1 And the inlet water temperature T of the first water chilling unit (15) 2 Adjusting the working state of the first water chilling unit (15); according to the load range of the second guide vane and the outlet water temperature T of the second water chilling unit (18) 3 And the temperature T of the inlet water of the second water chilling unit (18) 4 And adjusting the working state of the second water chilling unit (18).
9. The energy-saving method for the water chiller controlled by the frequency converter according to claim 8, wherein the step S3 specifically comprises:
s31: if the load range of the first guide vane is 70-100%, the first guide vane is fully opened; if the load range of the first guide vane is lower than 70%, the first guide vane starts to be closed, and when the load range of the first guide vane is 50%, the first guide vane is fully closed; the first cold water compressor starts to increase power if the load range of the first guide vane is lower than 50%, and the first cold water compressor increases to 130% at the maximum when the load range of the first guide vane is 20%;
if the water outlet temperature T is 1 Minus the inlet water temperature T 2 Is greater than a predetermined value T 5 If the current running power of the first cold water compressor is not 150%, the first cold water compressor works according to the current running power;
s32: if the load range of the second guide vane is 70-100%, the second guide vane is fully opened; if the load range of the second guide vane is lower than 70%, the second guide vane starts to be closed, and when the load range of the second guide vane is 50%, the second guide vane is fully closed; if the load range of the second guide vane is lower than 50%, the second cold water compressor starts to increase power, and when the load range of the second guide vane is 20%, the second cold water compressor is increased to 130% at most;
if it is as describedTemperature T of outlet water 3 Minus the inlet water temperature T 4 Is greater than a predetermined value T 6 And if not, the second cold water compressor works according to the current running power.
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