System and operation mode for rapid response of waste heat generator set under mains supply fault

Abstract

The invention belongs to the technical field of emergency power generation equipment, and discloses a system for rapid response of a waste heat generator set under a mains supply fault and an operation mode, the system comprises a power supply module and a circuit bus, the power supply module is composed of a small diesel generator and a waste heat generator set, the diesel generator and the waste heat generator set are connected into the circuit bus in parallel, the frequency conversion device is electrically connected between the waste heat generator set and the circuit bus, the combination of the small diesel generator and the waste heat generator set is used for replacing a large diesel generator set to serve as emergency power supply equipment, the energy cost of enterprises is saved, and meanwhile more energy saving and environmental protection are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of emergency power supply, and in particular relates to a system and an operation mode for a waste heat generator set to quickly respond to a mains failure. Background Art

[0002] In modern factory production, production, lighting, security and other equipment all require electricity to drive. Once a power outage occurs, various equipment will stop working, affecting production efficiency and creating safety hazards. Therefore, emergency power supply equipment is essential to ensure the normal production of the factory.

[0003] The invention patent with application number 202311646936.7 discloses a fully automatic sequential control device and method for emergency load power supply in large factories. When the detection module detects that there is no voltage and current signal in the power supply line of the AC power supply, the control module controls the emergency power supply to start quickly to supply power to the factory's electrical equipment, where the emergency power supply is a large diesel generator set.

[0004] Large diesel generator sets have disadvantages such as high noise, low energy efficiency level, and serious emission pollution. The operation of large diesel generator sets requires a large amount of diesel, which has high energy costs. At the same time, the storage of diesel also has certain safety hazards. Therefore, it is necessary to seek a low-energy-cost, low-emission generator set as an emergency power supply equipment. Summary of the invention

[0005] The main technical problem to be solved by the present invention is to provide a system and operation mode for rapid response of a waste heat generator set in the event of a city power failure. By using a combination of a small diesel generator and a waste heat generator set instead of a large diesel generator set as an emergency power supply equipment, the energy cost of the enterprise can be saved, and it is more energy-saving and environmentally friendly.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: A system for rapid response of a waste heat generator set in the event of a mains failure comprises a power supply module and a circuit bus. The power supply module is composed of a small diesel generator and a group of waste heat generator sets. The diesel generator and the waste heat generator set are connected in parallel to the circuit bus. A frequency conversion device is electrically connected between the waste heat generator set and the circuit bus.

[0007] The following is a further optimization of the above technical solution by the present invention: the emergency power supply device also includes a control system, and the control system is used to control the power supply module to work according to a preset program.

[0008] Further optimization: A switch group is arranged on the circuit bus, including a first switch between the mains power grid, a second switch between the power-consuming equipment, a third switch between the diesel generator and a fourth switch between the frequency conversion device, and the control system controls the opening and closing of each switch.

[0009] Further optimization: The control system consists of a controller and a control panel, the controller and the control panel are electrically connected, and a control program is set in the controller.

[0010] Further optimization: the frequency conversion device is a four-quadrant frequency converter, and a protection device is electrically connected between the frequency conversion device and the fourth switch.

[0011] The present invention also provides an operation mode for a waste heat generator set to respond quickly to a mains failure. Based on the system for a waste heat generator set to respond quickly to a mains failure, the operation mode includes the following steps: S1: The city power is cut off, the frequency conversion device controls the waste heat generator set to shut down, the control system controls the first switch to open, the third switch and the fourth switch to close, and at the same time controls the diesel generator to start generating electricity; S2: The protection device connects the main circuit of the frequency converter, and the frequency converter starts and goes into standby mode; S3: The rotating parts in the waste heat generator set start to rotate; S4: The waste heat generator set starts to generate electricity, and the generated electricity is transmitted back to the circuit bus through the frequency conversion device.

[0012] Further optimization: The condition for the rotation of the rotating parts in S3 is that the operator operates and controls the frequency conversion device through the controller to start working, driving the rotating parts in the waste heat generator set to rotate.

[0013] Further optimization: The condition for the waste heat generator set to generate electricity in S4 is that when the control system detects that the rotating parts in the waste heat generator set have reached the set speed, the waste heat generator set is controlled to operate and generate electricity.

[0014] The present invention adopts the above technical solution and has the following beneficial effects: The power supply equipment of the present invention uses a combination of a small diesel generator and a waste heat generator set to replace a large diesel generator set. The small diesel generator is only used to provide an initial voltage for starting the waste heat generator. The entire power generation process consumes only a small amount of diesel, which can reduce the energy cost of the enterprise and reduce pollutant emissions. Most of the high-temperature working fluids such as waste gas and waste liquid generated during the factory production process do not meet the environmental emission requirements. The waste heat generator set used in the present invention can convert the heat energy in the high-temperature working fluid into electrical energy, improve energy utilization efficiency, and reduce the cost of environmental protection and emission of enterprises; The waste heat generator used in the present invention can not only be used as an emergency power supply device, but also can work and generate electricity when the mains power is normally supplied, and can be connected to the mains power grid to further reduce the electricity cost of the factory; The present invention uses automatic control of the control system to quickly respond to a power failure and start the power supply module to supply power, so that the factory can resume normal production in a short time and reduce related losses of the factory.

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall wiring of an embodiment of the present invention; Figure 2 A schematic diagram of a control system according to an embodiment of the present invention; Figure 3 This is a flow chart of emergency power supply according to an embodiment of the present invention.

[0017] In the figure: 1. Circuit bus; 2. Power supply module; 201. Diesel generator; 202. Waste heat generator set; 3. Protection device; 4. Frequency conversion device; 5. Control system; 501. Controller; 502. Control panel; 6. First switch; 7. Second switch; 8. Third switch; 9. Fourth switch. DETAILED DESCRIPTION

[0018] like Figure 1 The system for rapid response of waste heat generator sets to a mains failure shown in the figure comprises a power supply module 2 and a circuit bus 1. The power supply module 2 consists of a small diesel generator 201 and a group of waste heat generator sets 202. The diesel generator 201 and the waste heat generator sets 202 are connected in parallel to the circuit bus 1. The waste heat generator sets 202 convert the thermal energy of the high-temperature working fluid into electrical energy. The circuit bus 1 is used to transmit electrical energy to various electrical equipment.

[0019] The waste heat generator set 202 is composed of multiple waste heat generators connected in parallel, which can convert more thermal energy into electrical energy to meet higher power demand. When one of the waste heat generators fails and needs maintenance, the other waste heat generators can still operate normally and supply power. Depending on the size of the power generation demand, the waste heat generator set 202 may also include only one waste heat generator.

[0020] A frequency conversion device 4 is electrically connected between the waste heat power generation set 202 and the circuit bus 1 , and a protection device 3 is electrically connected to the input end of the frequency conversion device 4 .

[0021] In this embodiment, the frequency conversion device 4 is a four-quadrant frequency converter, which can receive external power input to drive the rotating parts in the waste heat generator set 202 to rotate, providing initial conditions for the start-up of the waste heat generator set 202, and can also transmit the power generated by the waste heat generator set 202 back to the circuit bus 1 after the waste heat generator set 202 operates normally, thereby realizing two-way flow of power.

[0022] In this embodiment, the protection device 3 is an input contactor, and the power on and off of the main circuit of the frequency converter 4 is controlled by closing and opening the input contactor, thereby improving the stability of the entire circuit system.

[0023] In addition to this embodiment, the protection device 3 may also be a circuit breaker or an isolating switch to control the power on and off of the main circuit of the frequency conversion device 4 .

[0024] like Figure 2 As shown, the system for rapid response of a waste heat generator set to a mains failure of the present invention also includes a control system 5, and the control system 5 is used to control the power supply module 2 to run according to a preset program. The control system 5 is composed of a controller 501 and a control panel 502, and the controller 501 and the control panel 502 are electrically connected. A preset program is input into the controller 501, and the operator issues relevant instructions by operating the control panel 502 to control the program running in the controller 501, thereby realizing human-computer interaction.

[0025] In this embodiment, the controller 501 is a PLC, which is used to load a preset program, receive instructions issued by the control panel 502, and control the power supply module 2 to work.

[0026] A switch group is provided on the circuit bus 1, including a first switch 6 between the mains power grid, a second switch 7 between the power-consuming equipment, a third switch 8 between the diesel generator 201 and a fourth switch 9 between the protection device 3. The control system 5 controls the opening and closing of each switch to realize the connection and disconnection of different lines.

[0027] When the city power is supplied normally, the first switch 6, the second switch 7, and the fourth switch 9 are closed, and the third switch 8 is opened. At this time, the diesel generator 201 does not work, and the waste heat generator set 202 works to generate electricity. The generated electricity is transmitted back to the circuit bus 1 through the frequency conversion device 4, and is connected to the city power grid to generate electricity for use by electrical equipment. When the city power is cut off, the system is enabled for emergency power supply.

[0028] like Figure 3 As shown, this is the operation mode of the system based on the rapid response of the waste heat generator set under the above-mentioned mains failure. When the mains power is cut off, there is no current input at the input end of the frequency converter 4. For self-protection, the frequency converter 4 will control the waste heat generator set 202 to shut down. At this time, the controller 501 controls the first switch 6 to open, the third switch 8 and the fourth switch 9 to close, and at the same time controls the diesel generator 201 to start generating electricity and transmit the electricity to the circuit bus 1, and there is voltage in the circuit bus 1.

[0029] The voltage is input from the circuit bus 1 to the protection device 3, the protection device 3 is connected to the main circuit of the frequency converter 4, and the frequency converter 4 starts to standby; the operator operates the control panel 502, and controls the frequency converter 4 to start working through the controller 501, driving the rotating parts in the waste heat generator set 202 to rotate. At this time, the main air valve of the waste heat generator set 202 is in a closed state and the bypass valve is in an open state, that is, the high-temperature working fluid entering the waste heat generator set 202 does not participate in power generation at this time, and the waste heat generator set 202 is in motor mode.

[0030] When the control system 5 detects that the rotating parts in the waste heat generator set 202 have reached the set speed, the main gas valve of the waste heat generator set 202 is controlled to open and the bypass valve is closed, and the waste heat generator set 202 is switched to the generator mode. The generated electricity is transmitted back to the circuit bus 1 through the frequency conversion device 4 for use by electrical equipment.

[0031] When the mains power is restored, the controller 501 first controls the waste heat generator set 202 to shut down, and then controls the diesel generator 201 to shut down, the third switch 8 is disconnected, the first switch 6 is closed, the circuit bus 1 is connected to the mains power grid and disconnected from the diesel generator 201, and at the same time the waste heat generator set 202 is started and connected to the mains power grid to generate electricity for use by electrical equipment.

[0032] For those skilled in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, changes, modifications, substitutions and variations made to the implementation methods are still within the protection scope of the present invention.

Claims

1. A system for rapid response of a waste heat generator set to a mains failure, comprising a power supply module (2) and a circuit bus (1), characterized in that: The power supply module (2) is composed of a small diesel generator (201) and a group of waste heat generator sets (202); the diesel generator (201) and the waste heat generator sets (202) are connected in parallel to the circuit bus (1); and a frequency conversion device (4) is electrically connected between the waste heat generator sets (202) and the circuit bus (1).

2. The system for rapid response of waste heat generator set to mains failure according to claim 1 is characterized by: The emergency power supply device also includes a control system (5), wherein the control system (5) is used to control the power supply module (2) to operate according to a preset program.

3. The system for rapid response of waste heat generator set to mains failure according to claim 2 is characterized by: A switch group is provided on the circuit bus (1), including a first switch (6) between the mains power grid, a second switch (7) between the power-consuming equipment, a third switch (8) between the diesel generator (201), and a fourth switch (9) between the frequency conversion device (4). The control system (5) controls the opening and closing of each switch.

4. The system for rapid response of a waste heat generator set to a mains failure according to claim 3 is characterized in that: The control system (5) is composed of a controller (501) and a control panel (502). The controller (501) and the control panel (502) are electrically connected, and a control program is provided in the controller (501).

5. The system for rapid response of waste heat generator set to mains failure according to claim 4 is characterized in that: The frequency conversion device (4) is a four-quadrant frequency converter, and a protection device (3) is electrically connected between the frequency conversion device (4) and the fourth switch (9).

6. The operation mode of the waste heat generator set with rapid response under mains failure is characterized by: Based on the system for rapid response of the waste heat generator set to a mains failure according to claim 5, the operation mode includes the following steps: S1: the city power is cut off, the frequency conversion device (4) controls the waste heat generator set (202) to stop, the control system (5) controls the first switch (6) to open, the third switch (8) and the fourth switch (9) to close, and at the same time controls the diesel generator (201) to start generating electricity; S2: The protection device (3) connects to the main circuit of the frequency converter (4), and the frequency converter (4) starts to enter standby mode; S3: the rotating parts in the waste heat power generation unit (202) start to rotate; S4: The waste heat generator set (202) starts to generate electricity, and the generated electricity is transmitted back to the circuit bus (1) through the frequency conversion device (4).

7. The operation mode of the waste heat generator set for rapid response to a mains failure according to claim 6 is characterized by: The condition for the rotating parts in S3 to rotate is that the operator operates the control panel (502) to control the frequency conversion device (4) to start working through the controller (501), thereby driving the rotating parts in the waste heat power generation unit (202) to rotate.

8. The operation mode of the waste heat generator set for rapid response to a mains failure according to claim 6 is characterized by: In S4, the condition for the waste heat generator set (202) to start generating electricity is that, when the control system (5) detects that the rotating components in the waste heat generator set (202) have reached a set rotation speed, the waste heat generator set (202) is controlled to operate and generate electricity.

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