CN111706453A - Generator set preheating system and control method thereof - Google Patents
Generator set preheating system and control method thereof Download PDFInfo
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- CN111706453A CN111706453A CN202010584732.5A CN202010584732A CN111706453A CN 111706453 A CN111706453 A CN 111706453A CN 202010584732 A CN202010584732 A CN 202010584732A CN 111706453 A CN111706453 A CN 111706453A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
- F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2025/00—Measuring
- F01P2025/08—Temperature
- F01P2025/31—Cylinder temperature
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- General Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The application discloses a generator set preheating system and a control method thereof, and relates to the technical field of power supply of data centers. Generating set system of preheating includes: the main heating unit comprises a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is connected with the heat source device, and under the condition that the second heat exchange pipeline is connected with a cooling liquid flow path of the generator, cooling liquid enters the second heat exchange pipeline and exchanges heat with a heat carrying medium in the first heat exchange pipeline; the backup heating unit is arranged on the generator, and under the condition that the backup heating pipeline is connected with the cooling liquid flow path, the cooling liquid enters the backup heating pipeline and is heated by the electric heating device; and the control unit is used for controlling the cooling liquid flow path to be connected with the second heat exchange pipeline or the standby heating pipeline. The operation cost of the preheating system of the generator set is low, the preheating system can be switched to the standby heating unit to heat the cooling liquid when the main heating unit breaks down, and the preheating system has good stability and reliability.
Description
Technical Field
The present application relates to the technical field of power generation equipment, and in particular, to the technical field of power supply of data centers that can be used (including but not limited to) for applications such as cloud computing, cloud storage, big data computing, deep learning, and image processing.
Background
Data centers typically employ diesel generator sets as backup power sources for data centers, wherein the data centers may be used for applications including (but not limited to) cloud computing, cloud storage, big data computing, deep learning, image processing, and the like. When the environmental temperature of the generator set is low, the cooling liquid of the engine needs to be heated, and the temperature of the engine body is ensured to meet the requirement of starting the engine. In the related art, the diesel generating set usually adopts an electric heater as a heat source to heat the cooling liquid in the circulating water jacket of the engine body, and has the defects of high operation cost and the like.
Disclosure of Invention
The application provides a generator set preheating system and a control method thereof.
According to an aspect of the application, a genset preheat system is provided comprising:
the main heating unit comprises a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is connected with the heat source device, and under the condition that the second heat exchange pipeline is connected with a cooling liquid flow path of the generator, cooling liquid in the cooling liquid flow path enters the second heat exchange pipeline and exchanges heat with a heat-carrying medium in the first heat exchange pipeline;
the backup heating unit is arranged on the generator and comprises a backup heating pipeline and an electric heating device, and under the condition that the backup heating pipeline is connected with the cooling liquid flow path, the cooling liquid in the cooling liquid flow path enters the backup heating pipeline and is heated by the electric heating device;
and the control unit is used for controlling the cooling liquid flow path to be connected with the second heat exchange pipeline or the standby heating pipeline in the starting process of the generator.
In one embodiment, the genset preheat system further comprises:
the input end of the three-way valve is connected with the output end of the cooling liquid flow path, the first output end of the three-way valve is connected with the input end of the second heat exchange pipeline, and the second output end of the three-way valve is connected with the input end of the standby heating pipeline;
the control unit is electrically connected with the three-way valve to control the opening of the first output end or the second output end of the three-way valve.
In one embodiment, the main heating unit further comprises a liquid supply pipeline and a liquid return pipeline, wherein the output end of the liquid supply pipeline is connected with the input end of the second heat exchange pipeline, and the input end of the liquid return pipeline is connected with the output end of the second heat exchange pipeline;
the input end of the liquid supply pipeline is connected with the input end of the second heat exchange pipeline through the liquid supply branch, and the output end of the liquid return pipeline is connected with the first output end of the three-way valve through the liquid return branch.
In one embodiment, the liquid return line is provided with a variable frequency pump electrically connected with the control unit, and the control unit is further used for adjusting the working frequency of the variable frequency pump according to the pressure difference between the liquid supply line and the liquid return line.
In one embodiment, the liquid supply branch is provided with an electric control valve electrically connected with the control unit for adjusting the flow rate of the cooling liquid flowing through the liquid supply branch, and the control unit is also used for adjusting the opening degree of the electric control valve.
In one embodiment, the liquid return line and/or the liquid supply line is provided with a flow sensor electrically connected with the control unit for detecting the flow of the cooling liquid in the liquid return line and/or the liquid supply line;
the control unit is further used for controlling the first output end of the three-way valve to be closed and the second output end of the three-way valve to be opened under the condition that the detection result of the flow sensor is lower than the preset flow value, and controlling the electric heating device of the standby heating unit to be started.
In one embodiment, the output end of the backup heating pipeline is connected with the input end of the cooling liquid flow path, and the liquid return branch is provided with a one-way valve.
In one embodiment, the genset preheat system further comprises:
and the temperature sensor is arranged on the generator and is electrically connected with the control unit, the temperature sensor is used for detecting the temperature of the cylinder body of the generator, and the control unit controls the cooling liquid flow path to be connected with the second heat exchange pipeline or the standby heating pipeline according to the temperature detection result of the temperature sensor.
According to another aspect of the present application, there is provided a control method of a preheating system of a generator set, including:
detecting whether the generator is started;
in the starting process of the generator, controlling a cooling liquid flow path of the generator to be connected with a second heat exchange pipeline of the main heating unit or a standby heating pipeline of the standby heating unit;
under the condition that the second heat exchange pipeline is connected with the cooling liquid flow path, cooling liquid in the cooling liquid flow path enters the second heat exchange pipeline and exchanges heat with a heat-carrying medium in the first heat exchange pipeline; in the case where the backup heating line is connected to the coolant flow path, the coolant in the coolant flow path enters the backup heating line and is heated by the electric heating device of the backup heating unit.
In one embodiment, controlling the coolant flow path to be connected to the second heat exchange line includes:
controlling a first output end of a three-way valve to be opened and a second output end of the three-way valve to be closed, wherein the input end of the three-way valve is connected with the output end of the cooling liquid flow path, the first output end of the three-way valve is connected with the input end of the second heat exchange pipeline, and the second output end of the three-way valve is connected with the input end of the standby heating pipeline;
and controlling the variable frequency pump to start, wherein the variable frequency pump is arranged on the liquid supply pipeline of the second heat exchange pipeline.
In one embodiment, controlling the coolant flow path to be connected to the backup heating line includes:
receiving a temperature detection result of a temperature sensor, wherein the temperature sensor is used for detecting the temperature of a cylinder body of the generator;
judging whether the temperature detection result reaches the operating temperature of the generator or not within a preset time period;
under the condition that the temperature detection result does not reach the operation temperature of the generator within the preset time period, controlling a first output end of a three-way valve to be closed and a second output end of the three-way valve to be opened, wherein the input end of the three-way valve is connected with the output end of a cooling liquid flow path, the first output end of the three-way valve is connected with the input end of a second heat exchange pipeline, and the second output end of the three-way valve is connected with the input end of a standby heating pipeline;
controlling the electric heating device of the standby heating unit to start;
and controlling the variable frequency pump to stop running, wherein the variable frequency pump is arranged on the liquid supply pipeline of the second heat exchange pipeline.
In one embodiment, the controlling the coolant flow path to be connected to the backup heating line further includes:
under the condition that the temperature detection result reaches the operating temperature of the generator within a preset time period, controlling a first output end of a three-way valve to be closed and a second output end of the three-way valve to be opened;
and controlling the electric heating device to stop running.
In one embodiment, controlling the coolant flow path to be connected to the backup heating line includes:
receiving a flow detection result of a flow sensor, wherein the flow sensor is used for detecting the flow of cooling liquid in a liquid return pipeline of the second heat exchange pipeline and/or a liquid supply pipeline of the second heat exchange pipeline;
judging whether the flow detection result reaches a preset flow value or not;
under the condition that the flow detection result does not reach the preset flow value, controlling a first output end of a three-way valve to be closed and a second output end of the three-way valve to be opened, wherein the input end of the three-way valve is connected with the output end of the cooling liquid flow path, the first output end of the three-way valve is connected with the input end of a second heat exchange pipeline, and the second output end of the three-way valve is connected with the input end of a standby heating pipeline;
controlling the electric heating device to start;
and controlling the variable frequency pump to stop running, wherein the variable frequency pump is arranged on the liquid supply pipeline of the second heat exchange pipeline.
By adopting the technical scheme, the preheating system of the generator set can utilize high-temperature return water of the heat source device to heat the cooling liquid, the running temperature of the cylinder body of the generator is met, and when the main heating unit breaks down, the standby heating unit can be switched to heat the cooling liquid, so that the preheating system has good stability and reliability.
It should be understood that what is described in this summary section is not intended to limit key or critical features of the embodiments of the application, nor is it intended to limit the scope of the application. Other features of the present application will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of various embodiments of the present application will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:
FIG. 1 is a schematic diagram of a genset preheat system in accordance with an embodiment of the present application;
FIG. 2 is a flow chart of a control method of a genset preheat system in accordance with an embodiment of the present application;
FIG. 3 is a flow chart of a control method of a genset preheat system in accordance with an embodiment of the present application;
FIG. 4 is a flow chart of a control method of a genset preheat system in accordance with an embodiment of the present application;
fig. 5 is a flowchart of a control method of a genset preheat system according to an embodiment of the present application.
Detailed Description
The following description of the exemplary embodiments of the present application, taken in conjunction with the accompanying drawings, includes various details of the embodiments of the application for the understanding of the same, which are to be considered exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
A genset preheat system 1 in accordance with an embodiment of the present application is described below with reference to fig. 1. According to generating set system 1 of preheating of this application embodiment can be used for preheating generating set to when generating set's operational environment temperature is lower, heat the coolant liquid of generator 40, satisfy the start-up requirement with the organism temperature of guaranteeing generator 40. The data center can be used for (including but not limited to) cloud computing, cloud storage, big data computing, deep learning, image processing and other applications.
As shown in fig. 1, the genset preheat system 1 includes a primary heating unit 10, a backup heating unit 20, and a control unit 30.
Specifically, the primary heating unit 10 includes a first heat exchange line (not shown in the figure) connected to the heat source device 60, and a second heat exchange line (not shown in the figure), in which, when the second heat exchange line is connected to the coolant flow path 41 of the generator 40, the coolant in the coolant flow path 41 enters the second heat exchange line and exchanges heat with the heat carrier in the first heat exchange line. When the coolant flow path 41 of the generator 40 is connected to the second heat exchange pipeline, the preheating system 1 of the generator set is in the active heating mode.
In one example, the primary heating unit 10 further comprises a plate heat exchanger 10a, and the first heat exchange line and the second heat exchange line are both disposed in the plate heat exchanger 10 a. The heat source device 60 may be a high-temperature water return device of a liquid cooling air conditioning system of the data center, the heat-carrying medium may be high-temperature return water output by the high-temperature water return device, and the high-temperature water return device is connected with the first heat exchange pipeline through a heat source pipe network. Specifically, the output end of the heat source pipe network is connected with the input end of the first heat exchange pipeline through a heat carrying medium conveying pipeline 61 so as to convey the heat carrying medium into the second heat exchange pipeline; the input end of the heat source pipe network is connected with the output end of the first heat exchange pipeline through a heat-carrying medium loop pipeline, so that the heat-carrying medium flows out after heat exchange is carried out on the second heat exchange pipeline and flows back to the heat source pipe network.
When the generator set is started, the coolant flow path 41 of the generator 40 is connected to the second heat exchange pipeline, and the second heat exchange pipeline and the coolant flow path 41 form a circulation loop, so that the coolant circularly flows between the coolant flow path 41 and the second heat exchange pipeline. When the cooling liquid flows to the second heat exchange pipeline, the cooling liquid exchanges heat with the heat-carrying medium in the first heat exchange pipeline, so that the cooling liquid absorbs heat and is heated. The heated coolant can preheat the cylinder of the generator 40 to ensure that the cylinder of the generator 40 can reach the operating temperature, thereby ensuring that the generator 40 can operate. Wherein, the operation temperature is the temperature that the cylinder body needs to reach when the generator 40 normally operates.
According to the genset preheat system 1 of the embodiment of the present application, the first heat exchange line is connected to the heat source device 60 of the data center, and the coolant flow path 41 of the generator 40 is connected to the second heat exchange line in the initial starting period of the generator 40, so that the coolant in the coolant flow path 41 flows to the second heat exchange line and exchanges heat with the heat carrier in the first heat exchange line. Therefore, on one hand, the high-temperature return water of the heat source device 60 can be used for heating the cooling liquid, so that the heated cooling liquid can preheat the cylinder body of the generator 40, and the running temperature of the cylinder body of the generator 40 is met; on the other hand, the high-temperature backwater of the heat source device 60 can be cooled, so that the energy consumption of a liquid cooling air conditioning system of the data center for cooling the high-temperature backwater is reduced, the purposes of energy conservation and emission reduction of the data center are achieved, and the operation cost of the data center is reduced.
In other embodiments of the present application, the heat source device 60 may also be a heating device of a data center room, such as a heating device, wherein the heat-carrying medium may be heating hot water.
As shown in fig. 1, the backup heating unit 20 is provided to the generator 40, and the backup heating unit 20 includes a backup heating line 21 and an electric heating device 22. When the backup heating line 21 is connected to the coolant flow path 41, the coolant in the coolant flow path 41 enters the backup heating line 21 and is heated by the electric heating device 22. When the coolant flow path 41 of the generator 40 is connected to the backup heating line 21, the genset preheat system 1 is in the backup heating mode. Thus, when the heat source device 60 or the plate heat exchanger 10a fails so that the primary heating unit 10 cannot meet the heating demand for the coolant, the coolant flow path 41 may be connected to the backup heating line 21, so that the genset preheat system 1 is switched to the backup heating mode, and the coolant is heated by the backup heating unit 20. Further, after the coolant reaches the operating temperature of the generator 40 and the generator 40 operates normally, the genset preheat system 1 may be switched from the active mode to the standby mode to circulate the coolant between the coolant flow path 41 and the standby heating line 21.
In one example, the coolant flow path 41 of the generator 40 may be connected to the backup heating line 21 at a start-up of the generator set, and the coolant flow path 41 and the backup heating line 21 form a circulation loop to circulate the coolant between the coolant flow path 41 and the backup heating line 21. The cooling liquid may be heated by the electric heating device 22 when flowing to the standby heating line 21, so as to raise the temperature of the cooling liquid. The heated coolant can preheat the cylinder of the generator 40 to heat the cylinder of the generator 40 to an operating temperature, so as to ensure that the generator 40 can operate. Further, the backup heating unit 20 further includes a circulation pump 23 for circulating the pumped coolant between the coolant flow path 41 and the backup heating line 21 when the coolant flow path 41 is connected to the backup heating line 21.
Further, the control unit 30 is configured to control the coolant flow path 41 to be connected to the second heat exchange line or backup heating line 21 during startup of the generator 40 to switch the genset preheat system 1 between the primary heating mode and the backup heating mode. In this way, when the heat source device 60 or the plate heat exchanger 10a fails, the coolant flow path 41 connected to the second heat exchange line may be switched to the backup heating line 21, that is, the genset preheat system 1 may be switched from the primary heating mode to the backup heating mode. Therefore, the cooling liquid in the cooling liquid flow path 41 of the generator 40 can be heated through the standby heating unit 20, the operation requirement of the generator 40 is met, and the stability and the reliability of the generator set preheating system 1 are ensured.
In one example, the generator set includes a plurality of generators 40, and the backup heating unit 20 is plural and provided in one-to-one correspondence with the plurality of generators 40. Specifically, when the genset preheat system 1 is in the active mode, the input ends of the coolant flow paths 41 of the plurality of generators 40 are arranged in parallel and connected to the output end of the second heat exchange pipeline, and the output ends of the coolant flow paths 41 of the plurality of generators 40 are arranged in parallel and connected to the input end of the second heat exchange pipeline, so that the active heating unit 10 can heat the coolant in the coolant flow paths 41 of the plurality of generators 40 at the same time. In the standby mode of the genset preheat system 1, the input of the coolant flow path 41 of each generator 40 is connected to the output of the backup heating line 21 and the output of the coolant flow path 41 of each generator 40 is connected to the input of the backup heating line 21 such that the coolant flow path 41 of the generator 40 forms a circulation loop with its backup heating unit 20 and heats the coolant.
In one embodiment, as shown in fig. 1, the genset preheat system 1 further includes a three-way valve 50, an input 51 of the three-way valve 50 being connected to the output of the coolant flow path 41, a first output 52 of the three-way valve 50 being connected to the input of the second heat exchange line, and a second output 53 of the three-way valve 50 being connected to the input of the backup heating line 21. The control unit 30 is electrically connected to the three-way valve 50 to control the first output 52 or the second output 53 of the three-way valve 50 to be opened. Therefore, the control unit 30 can realize the connection between the coolant flow path 41 and the second heat exchange pipeline or the connection between the coolant flow path 41 and the backup heating pipeline 21 by controlling the opening of the first output end 52 or the opening of the second output end 53 of the three-way valve 50, so as to switch between the main heating mode and the backup heating mode, and the switching mode is simple.
In one example, when the first output 52 of the three-way valve 50 is opened and the second output 53 is closed, the output of the coolant flow path 41 is connected to the input of the second heat exchange pipeline, and the input of the coolant flow path 41 is connected to the output of the second heat exchange pipeline, so that the coolant flow path 41 and the second heat exchange pipeline form a circulation loop. When the second output end 53 of the three-way valve 50 is opened and the first output end 52 is closed, the output end of the coolant flow path 41 is connected to the input end of the backup heating line 21, and the input end of the coolant flow path 41 is connected to the output end of the backup heating line 21, so that the coolant flow path 41 and the backup heating line 21 form a circulation loop. The three-way valve 50 may be a flow divider, further, the three-way valve 50 may be an electric three-way valve, and the electric three-way valve may adopt various technical solutions known by those skilled in the art now and in the future, and will not be described in detail herein. It is to be understood that the three-way valve 50 may be provided in plural numbers in one-to-one correspondence with the plural generators 40.
In one embodiment, the primary heating unit 10 further includes a liquid supply line 11 and a liquid return line 12, wherein an output end of the liquid supply line 11 is connected to an input end of the second heat exchange line, and an input end of the liquid return line 12 is connected to an output end of the second heat exchange line. Wherein, the input end of the liquid supply pipeline 11 is connected with the input end of the second heat exchange pipeline through the liquid supply branch 11a, and the output end of the liquid return pipeline 12 is connected with the first output end 52 of the three-way valve 50 through the liquid return branch 12 a. Thus, when the generator set is provided with a plurality of generators 40, the input end of the coolant flow path 41 of each generator 40 may be connected to the liquid supply line 11 of the primary heating unit 10 through the liquid supply branch line 11a, the output end of the coolant flow path 41 of each generator 40 may be connected to the input end 51 of the three-way valve 50, and the first output end 52 of the three-way valve 50 may be connected to the liquid return line 12 of the primary heating unit 10 through the liquid return branch line 12 a. Therefore, the pipeline arrangement connected between the plurality of generators 40 and the main heating unit 10 is simple, and the main heating unit 10 can be ensured to heat the cooling liquid of the plurality of generators 40 at the same time.
In one embodiment, the liquid return line 12 is provided with a variable frequency pump 13 electrically connected to the control unit 30, and the control unit 30 is further configured to adjust the operating frequency of the variable frequency pump 13 according to the pressure difference between the liquid supply line 11 and the liquid return line 12. For example, a differential pressure sensor 17 electrically connected to the control unit 30 is provided between the end of the liquid supply line 11 and the end of the liquid return line 12 to detect a differential pressure between the end of the liquid supply line 11 and the end of the liquid return line 12. Thus, the control unit 30 can adjust the output power of the inverter pump 13 according to the pressure difference between the end of the liquid supply pipeline 11 and the end of the liquid return pipeline 12 to ensure that the cooling liquid flow path 41 of the generator 40 connected between the end of the liquid supply pipeline 11 and the end of the liquid return pipeline 12 is supplied with liquid normally.
In addition, a heat carrier conveying pipeline 61 connected between the heat source device 60 and the first heat exchange pipeline may also be provided with an inverter pump 13 electrically connected to the control unit 30, and the control unit 30 adjusts the flow rate of the heat carrier conveyed from the heat source device 60 to the first heat exchange pipeline by adjusting the inverter pump 13, so as to adjust the heat exchange efficiency between the heat carrier in the first heat exchange pipeline and the coolant in the second heat exchange pipeline.
In one embodiment, the genset preheat system 1 further includes a temperature sensor. Specifically, a temperature sensor is provided at the generator 40 and electrically connected to the control unit 30, the temperature sensor is used for detecting the temperature of the cylinder of the generator 40, and the control unit 30 controls the coolant flow path 41 to be connected to the second heat exchange line or the backup heating line 21 according to the temperature detection result of the temperature sensor. When the temperature sensor does not reach the operating temperature of the generator 40 within the preset time period, that is, the main heating unit 10 is not enough to heat the coolant to the preset temperature, at this time, the control unit 30 controls the first output end 52 of the three-way valve 50 to be closed and the second output end 53 to be opened, and the coolant flow path 41 is connected to the backup heating pipeline 21, so that the generator set preheating system 1 is switched to the backup heating mode, so that the coolant is heated by the backup heating unit 20 to heat the cylinder of the generator 40 to the operating temperature. Thus, the three-way valve 50 can be controlled according to the temperature of the cylinder of the generator 40 to realize the switching of the preheating system 1 of the generator set between the primary heating mode and the standby heating mode.
In one embodiment, as shown in fig. 1, the liquid supply branch 11a is provided with an electric control valve 14 electrically connected to the control unit 30 for adjusting the flow rate of the cooling liquid flowing through the liquid supply branch 11a, and the control unit 30 is also used for adjusting the opening degree of the electric control valve 14. For example, the control unit 30 may adjust the opening degree of the electric control valve 14 according to the temperature detection result of the temperature sensor, and when the temperature sensor detects that the temperature of the cylinder of the generator 40 is higher than the upper limit value of the preset temperature range, the control unit 30 controls the electric control valve 14 to decrease the opening degree to decrease the flow rate of the coolant entering the second heat exchange pipeline, thereby decreasing the heating efficiency of the coolant, and further decreasing the cylinder temperature of the engine; when the temperature sensor detects that the temperature of the cylinder of the generator 40 is lower than the lower limit value of the preset temperature range, the control unit 30 controls the electric regulator valve 14 to increase the opening degree to increase the cylinder temperature of the engine.
In one embodiment, as shown in fig. 1, the liquid return line 12 and/or the liquid supply line 11 is provided with a flow sensor 15 electrically connected to the control unit 30 for detecting the flow of the cooling liquid in the liquid return line 12 and/or the liquid supply line 11. The control unit 30 is further configured to control the first output 52 of the three-way valve 50 to be closed and the second output 53 to be opened, and control the electric heating device 22 of the standby heating unit 20 to be activated, if the detection result of the flow sensor 15 is lower than the preset flow value. It can be understood that the flow sensor 15 is used to detect the flow velocity of the cooling liquid between the second heat exchange pipeline and the cooling liquid flow path 41, and determine whether the pipeline is blocked or the inverter pump 13 is failed according to the flow detection result of the flow sensor 15, and when the flow detection result of the flow sensor 15 is lower than the preset flow value, the first output end 52 of the three-way valve 50 is controlled to be closed and the second output end 53 is controlled to be opened, so as to connect the cooling liquid flow path 41 to the backup heating pipeline 21, that is, the genset preheating system 1 is switched from the primary heating mode to the backup heating mode. Thereby, the reliability of the genset preheat system 1 may be further improved.
In one example, at least one of the heat transfer medium feeding line 61 and the heat transfer medium return line 62 connected between the heat source device 60 and the first heat exchange line may also be provided with a flow sensor for detecting the flow of the heat transfer medium into or out of the second heat exchange line. And the flow sensor is electrically connected with the control unit 30 to switch the preheating system 1 of the generator set from the main heating mode to the standby heating mode when the flow of the heat carrying medium is lower than a preset flow value.
Furthermore, on-off valves 18 may be disposed on the heat carrier transport pipeline 61, the heat carrier return pipeline 62, the liquid supply pipeline 11, the liquid return pipeline 12, the liquid supply branch 11a and the liquid return branch 12a, so as to perform maintenance or repair when the plate heat exchanger 10a is cleaned or when the generator set preheating system 1 is drained or the generator 40 is switched to another working condition.
In one embodiment, as shown in FIG. 1, the output of the backup heating line 21 is connected to the input of the coolant flow path 41, and the return branch 12a is provided with a check valve 16. In this way, when the first output end 52 of the three-way valve 50 is closed and the second output end 53 is opened, the coolant can enter the input end of the backup heating pipeline 21 from the output end of the coolant flow path 41 through the second output end 53 of the three-way valve 50, and when the output end of the coolant backup heating pipeline 21 enters the input end of the coolant flow path 41, the check valve 16 is disposed on the liquid return branch 12a, so that the coolant can be prevented from flowing back to the liquid return pipeline 12 on the liquid return branch 12a, and the coolant can be ensured to circulate between the backup heating pipeline 21 and the coolant flow path 41.
Other configurations of the generator set preheating system 1 of the above embodiment may adopt various technical solutions known by those skilled in the art now and in the future, and will not be described in detail here.
2-5 illustrate a control method of a genset preheat system according to an embodiment of the present application.
As shown in fig. 2, the control method of the generator set preheating system includes:
step S101: and detecting whether the generator is started.
Step S102: and in the starting process of the generator, controlling a cooling liquid flow path of the generator to be connected with the second heat exchange pipeline of the main heating unit or the standby heating pipeline of the standby heating unit.
Under the condition that the second heat exchange pipeline is connected with the cooling liquid flow path, cooling liquid in the cooling liquid flow path enters the second heat exchange pipeline and exchanges heat with a heat-carrying medium in the first heat exchange pipeline; in the case where the backup heating line is connected to the coolant flow path, the coolant in the coolant flow path enters the backup heating line and is heated by the electric heating device of the backup heating unit.
In one example, the coolant flow path of the generator is controlled to be connected to the second heat exchange line of the primary heating unit when a start-up of the generator is detected. The main heating unit comprises a first heat exchange pipeline and a second heat exchange pipeline, wherein the first heat exchange pipeline is connected with a heat source device of the data center, so that cooling liquid in the cooling liquid flow path enters the second heat exchange pipeline and then exchanges heat with a heat carrying medium in the first heat exchange pipeline. After the generator normally operates, the cooling liquid flow path of the generator is controlled to be connected with the standby heating pipeline, so that the cooling liquid circularly flows in a circulating loop formed by the cooling liquid flow path and the standby heating pipeline.
According to the control method of the preheating system of the generator set, when the main heating unit fails, the cooling liquid of the generator can be heated through the standby heating unit so as to meet the operation requirement of the generator, and therefore the stability and the reliability of the preheating system of the generator set are guaranteed.
In one embodiment, as shown in fig. 3, step S102 includes:
step S201: and controlling a first output end of the three-way valve to be opened and a second output end of the three-way valve to be closed, wherein the input end of the three-way valve is connected with the output end of the cooling liquid flow path, the first output end of the three-way valve is connected with the input end of the second heat exchange pipeline, and the second output end of the three-way valve is connected with the input end of the standby heating pipeline. In one example, when the first output end of the three-way valve is opened and the second output end is closed, the input end of the coolant flow path is connected with the output end of the second heat exchange pipeline, the output end of the coolant flow path is connected with the input end of the three-way valve, and the first output end of the three-way valve is connected with the input end of the second heat exchange pipeline, so that the coolant flow path is connected with the second heat exchange pipeline, and the generator set preheating system is in a main heating mode at the moment.
Step S202: and controlling the variable frequency pump to start, wherein the variable frequency pump is arranged on the liquid supply pipeline of the second heat exchange pipeline. Wherein, the output end of the liquid supply pipeline is connected with the input end of the second heat exchange pipeline. It will be appreciated that the variable frequency pump is operable to pump the coolant in the supply line to the second heat exchange line and maintain the flow of coolant between the second heat exchange line and the coolant line.
Therefore, the switching connection between the cooling liquid conveying pipeline of the generator and the second heat exchange pipeline and the standby heating pipeline can be realized by controlling the opening of the first output end or the second output end of the three-way valve, so that the preheating system of the generator set is switched between the main heating mode and the standby heating mode, and the control mode is simple and convenient.
In one embodiment, as shown in fig. 4, step S102 includes:
step S301: and receiving a temperature detection result of a temperature sensor, wherein the temperature sensor is used for detecting the temperature of a cylinder body of the generator.
Step S302: and judging whether the temperature detection result reaches the operating temperature of the generator or not within a preset time period. The preset time period is the time required by the preset starting process of the generator.
Step S303: and under the condition that the running temperature of the generator is not reached in the temperature detection result in the preset time period, controlling the first output end of the three-way valve to be closed and the second output end to be opened. The input end of the three-way valve is connected with the output end of the cooling liquid flow path, the first output end of the three-way valve is connected with the input end of the second heat exchange pipeline, and the second output end of the three-way valve is connected with the input end of the standby heating pipeline.
In one example, when the first output of the three-way valve is closed and the second output is open, the input of the coolant flow path is connected to the output of the backup heating line and the output of the coolant flow path is connected to the input of the backup heating line, such that the coolant flow path is connected to the second heat exchange line, and the genset preheat system is in the backup heating mode.
Step S304: and controlling the electric heating device of the standby heating unit to start. Wherein the electric heating device is used for heating the cooling liquid flowing through the standby heating pipeline.
Step S305: and controlling the variable frequency pump to stop running, wherein the variable frequency pump is arranged on the liquid supply pipeline of the second heat exchange pipeline.
Therefore, the three-way valve can be controlled according to the temperature of the cylinder body of the generator, and when the main heating unit fails, the preheating system of the generator set is switched from the main heating mode to the standby heating mode in time.
In one embodiment, as shown in fig. 4, step S102 further includes:
step S306: and under the condition that the temperature detection result reaches the operating temperature of the generator within the preset time period, controlling the first output end of the three-way valve to be closed and the second output end to be opened.
Step S307: and controlling the electric heating device to stop running.
Thus, after the generator reaches the operating temperature, i.e., the generator operates normally, the coolant flow path of the generator is connected to the backup heating line so that the coolant circulates between the backup heating line and the coolant flow path.
In one embodiment, as shown in fig. 5, step S102 further includes:
step S401: and receiving a flow detection result of a flow sensor, wherein the flow sensor is used for detecting the flow of the cooling liquid in the liquid return pipeline of the second heat exchange pipeline and/or the liquid supply pipeline of the second heat exchange pipeline.
Step S402: and judging whether the flow detection result reaches a preset flow value or not.
Step S403: and under the condition that the flow detection result does not reach the preset flow value, controlling the first output end of the three-way valve to be closed and the second output end of the three-way valve to be opened, connecting the input end of the three-way valve with the output end of the cooling liquid flow path, connecting the first output end of the three-way valve with the input end of the second heat exchange pipeline, and connecting the second output end of the three-way valve with the input end of the standby heating pipeline.
Step S404: controlling the electric heating device to start.
Step S405: and controlling the variable frequency pump to stop running, wherein the variable frequency pump is arranged on the liquid supply pipeline of the second heat exchange pipeline.
Therefore, whether the pipeline is blocked or the variable frequency pump fails can be judged according to the flow detection result of the flow sensor, when the flow detection result of the flow sensor is lower than a preset flow value, the first output end of the three-way valve is controlled to be closed, and the second output end of the three-way valve is controlled to be opened, so that the cooling liquid flow path is connected with the standby heating pipeline, namely the preheating system of the generator set is switched from the main heating mode to the standby heating mode, and the reliability of the preheating system of the generator set is further improved.
By adopting the technical scheme, on one hand, the generator set preheating system 1 of the embodiment of the application can utilize the high-temperature return water of the heat source device 60 to heat the cooling liquid, so that the heated cooling liquid preheats the cylinder body of the generator 40 and meets the operation temperature of the cylinder body of the generator 40; on the other hand, the high-temperature backwater of the heat source device 60 can be cooled, so that the energy consumption of a liquid cooling air conditioning system of the data center for cooling the high-temperature backwater is reduced, the purposes of energy conservation and emission reduction of the data center are achieved, and the operation cost of the data center is reduced. Moreover, when the main heating unit 10 fails, the cooling liquid of the generator 10 may be heated by the standby heating unit 20 to meet the operation requirement of the generator 10, so as to ensure the stability and reliability of the preheating system 1 of the generator set.
The above-described embodiments should not be construed as limiting the scope of the present application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (13)
1. A genset preheat system, comprising:
the main heating unit comprises a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is connected with a heat source device, and under the condition that the second heat exchange pipeline is connected with a cooling liquid flow path of the generator, cooling liquid in the cooling liquid flow path enters the second heat exchange pipeline and exchanges heat with heat-carrying media in the first heat exchange pipeline;
the backup heating unit is arranged on the generator and comprises a backup heating pipeline and an electric heating device, and under the condition that the backup heating pipeline is connected with the cooling liquid flow path, the cooling liquid in the cooling liquid flow path enters the backup heating pipeline and is heated by the electric heating device;
and the control unit is used for controlling the cooling liquid flow path to be connected with the second heat exchange pipeline or the standby heating pipeline in the starting process of the generator.
2. The genset preheat system of claim 1, further comprising:
the input end of the three-way valve is connected with the output end of the cooling liquid flow path, the first output end of the three-way valve is connected with the input end of the second heat exchange pipeline, and the second output end of the three-way valve is connected with the input end of the standby heating pipeline;
the control unit is electrically connected with the three-way valve to control the opening of the first output end or the second output end of the three-way valve.
3. The pre-heating system of the generator set according to claim 2, wherein the primary heating unit further comprises a liquid supply pipeline and a liquid return pipeline, an output end of the liquid supply pipeline is connected with an input end of the second heat exchange pipeline, and an input end of the liquid return pipeline is connected with an output end of the second heat exchange pipeline;
the input end of the liquid supply pipeline is connected with the input end of the second heat exchange pipeline through a liquid supply branch, and the output end of the liquid return pipeline is connected with the first output end of the three-way valve through a liquid return branch.
4. The generator set preheating system of claim 3, wherein the return line is provided with a variable frequency pump electrically connected to the control unit, and the control unit is further configured to adjust an operating frequency of the variable frequency pump according to a pressure difference between the supply line and the return line.
5. The generator set preheating system of claim 3, wherein the liquid supply branch is provided with an electric control valve electrically connected with the control unit for adjusting the flow rate of the cooling liquid flowing through the liquid supply branch, and the control unit is further used for adjusting the opening degree of the electric control valve.
6. The system according to claim 3, characterized in that said return line and/or said supply line are provided with a flow sensor electrically connected to said control unit for detecting the flow of cooling liquid in said return line and/or said supply line;
the control unit is further used for controlling the first output end of the three-way valve to be closed and the second output end of the three-way valve to be opened under the condition that the detection result of the flow sensor is lower than a preset flow value, and controlling the electric heating device of the standby heating unit to be started.
7. The genset preheat system of claim 3, wherein an output of the backup heating line is coupled to an input of the coolant flow path, and the return branch is provided with a check valve.
8. The genset preheat system of any one of claims 1-7, further comprising:
the temperature sensor is arranged on the generator and electrically connected with the control unit, the temperature sensor is used for detecting the temperature of the cylinder body of the generator, and the control unit controls the cooling liquid flow path to be connected with the second heat exchange pipeline or the standby heating pipeline according to the temperature detection result of the temperature sensor.
9. A control method of a preheating system of a generator set is characterized by comprising the following steps:
detecting whether the generator is started;
controlling a cooling liquid flow path of the generator to be connected with a second heat exchange pipeline of the main heating unit or a standby heating pipeline of the standby heating unit in the starting process of the generator;
under the condition that the second heat exchange pipeline is connected with the cooling liquid flow path, the cooling liquid in the cooling liquid flow path enters the second heat exchange pipeline and exchanges heat with the heat-carrying medium in the first heat exchange pipeline; under the condition that the backup heating pipeline is connected with the cooling liquid flow path, the cooling liquid in the cooling liquid flow path enters the backup heating pipeline and is heated by the electric heating device of the backup heating unit.
10. The method of claim 9, wherein controlling the coolant flow path to be coupled to the second heat exchange line comprises:
controlling a first output end of a three-way valve to be opened and a second output end of the three-way valve to be closed, wherein an input end of the three-way valve is connected with an output end of the cooling liquid flow path, the first output end of the three-way valve is connected with an input end of the second heat exchange pipeline, and the second output end of the three-way valve is connected with an input end of the standby heating pipeline;
and controlling a variable frequency pump to start, wherein the variable frequency pump is arranged on a liquid supply pipeline of the second heat exchange pipeline.
11. The method of claim 9, wherein controlling the coolant flow path to be connected to the backup heating line comprises:
receiving a temperature detection result of a temperature sensor, wherein the temperature sensor is used for detecting the temperature of a cylinder body of the generator;
judging whether the temperature detection result reaches the operating temperature of the generator or not within a preset time period;
controlling a first output end of a three-way valve to be closed and a second output end of the three-way valve to be opened under the condition that the temperature detection result does not reach the operating temperature of the generator within a preset time period, wherein an input end of the three-way valve is connected with an output end of the cooling liquid flow path, the first output end of the three-way valve is connected with an input end of the second heat exchange pipeline, and the second output end of the three-way valve is connected with an input end of the standby heating pipeline;
controlling the electric heating device of the standby heating unit to start;
and controlling the variable frequency pump to stop running, wherein the variable frequency pump is arranged on the liquid supply pipeline of the second heat exchange pipeline.
12. The method of claim 11, wherein controlling the coolant flow path to be connected to the backup heating line further comprises:
controlling a first output end of the three-way valve to be closed and a second output end of the three-way valve to be opened under the condition that the temperature detection result reaches the operating temperature of the generator within a preset time period;
and controlling the electric heating device to stop running.
13. The method of claim 9, wherein controlling the coolant flow path to be connected to the backup heating line comprises:
receiving a flow detection result of a flow sensor, wherein the flow sensor is used for detecting the flow of the cooling liquid in the liquid return pipeline of the second heat exchange pipeline and/or the liquid supply pipeline of the second heat exchange pipeline;
judging whether the flow detection result reaches a preset flow value or not;
under the condition that the flow detection result does not reach the preset flow value, controlling a first output end of a three-way valve to be closed and a second output end of the three-way valve to be opened, wherein an input end of the three-way valve is connected with an output end of the cooling liquid flow path, the first output end of the three-way valve is connected with an input end of the second heat exchange pipeline, and the second output end of the three-way valve is connected with an input end of the standby heating pipeline;
controlling the electric heating device to start;
and controlling the variable frequency pump to stop running, wherein the variable frequency pump is arranged on the liquid supply pipeline of the second heat exchange pipeline.
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Application publication date: 20200925 |