A protection method for single-cylinder temperature multi-threshold graded early warning of a gas generator set

Abstract

The application discloses a protection method for single-cylinder temperature multi-threshold grading early warning of a gas generator set, which comprises single-cylinder temperature high four-threshold four-grade early warning protection and single-cylinder temperature low two-threshold two-grade early warning protection. The single-cylinder temperature high four-threshold four-grade early warning protection comprises an alarm prompt program, a power reduction operation program, an unloading shutdown program and an emergency shutdown program. The single-cylinder temperature low two-threshold two-grade early warning protection comprises an alarm prompt program and a power reduction operation program. The protection method for single-cylinder temperature multi-threshold grading early warning of the gas generator set adopts bidirectional multi-threshold grading early warning protection of single-cylinder temperature high and single-cylinder temperature low, has high protection precision, clear protection levels, can effectively prevent light protection or heavy protection, and guarantees the operation safety of the gas generator set.

Description

Technical Field

[0001] This invention relates to the field of gas generator set technology, specifically to a protection method for multi-threshold graded early warning of single-cylinder temperature in a gas generator set. Background Technology

[0002] During the operation of a gas generator set, excessively high or low cylinder temperatures directly affect the stability, reliability, and safety of the unit. Excessively high cylinder temperatures damage the lubricating oil film on the cylinder wall, reducing lubrication performance and accelerating wear on components. The piston and piston rings in the cylinder expand due to excessive temperature, disrupting the fit clearance and increasing wear resistance. In severe cases, this can lead to cylinder scoring, seizure, and damage to the engine block. Conversely, excessively low cylinder temperatures are generally accompanied by poor ignition and power output in that cylinder, increasing the power load on other cylinders, accelerating abnormal wear of the gas engine, and increasing vibration of the generator set. In severe cases, this can also lead to cylinder scoring, seizure, and damage to the engine block.

[0003] The commonly used single-cylinder temperature single-threshold protection logic implementation method is simple and convenient, but the protection accuracy is not high, which can easily lead to under-protection or over-protection, seriously affecting the safe operation and service life of the gas generator set. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a protection method for multi-threshold graded early warning of single cylinder temperature of gas generator set, which can effectively avoid the protection being too light or too heavy, and can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a protection method for multi-threshold graded early warning of single-cylinder temperature in a gas generator set, comprising a four-level early warning protection with four thresholds for high single-cylinder temperature and a two-level early warning protection with two thresholds for low single-cylinder temperature. The four-level early warning protection with four thresholds for high single-cylinder temperature includes an alarm prompting program, a power reduction operation program, an unloading shutdown program, and an emergency shutdown program. The two-level early warning protection with two thresholds for low single-cylinder temperature includes an alarm prompting program and a power reduction operation program.

[0006] As a preferred technical solution of the present invention, the alarm prompting program for high temperature in a single cylinder is as follows: if the temperature of a single cylinder is greater than or equal to the high temperature alarm prompting threshold, regardless of whether the unit is unloaded or loaded, the protection delay is activated; if the temperature of a single cylinder is less than the alarm prompting threshold within the protection delay range, the protection delay is reset to zero, there is no alarm prompting output, and the unit continues to operate in the current state.

[0007] If, after the protection delay, the temperature of a single cylinder is greater than or equal to the alarm threshold but less than the high-temperature power reduction operating threshold, the programmable control system will activate the alarm and issue an audible and visual alarm.

[0008] As a preferred technical solution of the present invention, the power reduction operation procedure at high temperature of a single cylinder is as follows: the single cylinder temperature is greater than or equal to the power reduction operation threshold at high temperature, and less than the unloading and shutdown threshold at high temperature. If the unit is unloaded or the unit's operating power is less than or equal to 30% of the unit's rated power at this time, the programmable control system will only activate the alarm prompt output.

[0009] If the unit's operating power is greater than 30% of its rated power at this time, the programmable control system will activate reduced power operation and output an alarm. At the same time, the programmable control system will assign the unit's set power to 30% of its rated power. Within 45 seconds, the programmable control system will control the unit's operating power to gradually decrease to the unit's set power, that is, to operate at 30% of the unit's rated power.

[0010] As a preferred technical solution of the present invention, the unloading and shutdown procedure for high temperature in a single cylinder is as follows: if the temperature of a single cylinder is greater than or equal to the high temperature unloading and shutdown threshold and less than the high temperature emergency shutdown threshold, and if the unit is unloaded or the unit's operating power is less than or equal to 30% of the unit's rated power at this time, the programmable control system will only activate the alarm prompt output.

[0011] If the unit's operating power is greater than 30% of its rated power at this time, the programmable control system will activate load reduction and shutdown, and output an alarm. At the same time, the programmable control system will assign the unit's set power to 10% of the unit's rated power. Within 60 seconds, the programmable control system will control the unit's operating power to gradually decrease to the unit's set power, that is, 10% of the unit's rated power. After the unit's operating power decreases to 10% of the unit's rated power, the programmable control system will control the unit to disconnect and shut down.

[0012] As a preferred technical solution of the present invention, the emergency shutdown procedure for high single-cylinder temperature is as follows: when the single-cylinder temperature is greater than or equal to the high temperature emergency shutdown threshold, regardless of whether the unit is unloaded or loaded, the programmable control system outputs an alarm prompt and simultaneously issues an emergency shutdown control signal to control the unit's flow valve to close, the speed control valve to close, the ignition system to stop ignition, and the gas branch pipeline gas shut-off valve to close, thus causing the unit to shut down urgently.

[0013] As a preferred technical solution of the present invention, the alarm prompting program for low single-cylinder temperature is as follows: if the single-cylinder temperature is less than or equal to the low temperature alarm prompting threshold, regardless of whether the unit is unloaded or loaded, the protection delay is activated, and the protection delay is 3s. If the single-cylinder temperature is greater than the low temperature alarm prompting threshold within the 3s protection delay, the protection delay is reset to zero, there is no alarm prompting output, and the unit continues to operate in the current state.

[0014] If, after a 3-second protection delay, the temperature of a single cylinder is less than or equal to the low temperature alarm threshold but greater than the low temperature power reduction operation threshold, the programmable control system will activate the alarm and issue an audible and visual alarm.

[0015] As a preferred technical solution of the present invention, the power reduction operation procedure for low single-cylinder temperature is as follows: if the single-cylinder temperature is less than or equal to the low temperature power reduction operation threshold, and if the unit is unloaded or the unit's operating power is less than or equal to 30% of the unit's rated power at this time, the programmable control system will only activate the alarm prompt output.

[0016] If the unit's operating power is greater than 30% of its rated power at this time, the programmable control system will activate reduced power operation and output an alarm. At the same time, the programmable control system will assign the unit's set power to 30% of its rated power. Within 45 seconds, the programmable control system will control the unit's operating power to gradually decrease to the unit's set power, that is, to operate at 30% of the unit's rated power.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the protection method of multi-threshold graded early warning for single cylinder temperature of the gas generator set adopts bidirectional multi-threshold graded early warning protection for single cylinder high temperature and single cylinder low temperature. By setting multiple protection threshold grades corresponding to different levels of protection actions, the protection levels are clear and the severity is reasonable. It can effectively prevent the protection from being too light or too heavy, ensure the safe operation of the gas generator set, and extend its service life. Attached Figure Description

[0018] Figure 1 This is a flowchart of the single-cylinder high temperature four-threshold four-level early warning control logic of the present invention;

[0019] Figure 2 This is a flowchart of the single-cylinder low temperature two-threshold two-level early warning control logic of the present invention.

[0020] In the diagram: G1 is the high temperature alarm threshold for a single cylinder, G2 is the high temperature power reduction operating threshold for a single cylinder, G3 is the high temperature unloading shutdown threshold for a single cylinder, G4 is the high temperature emergency shutdown threshold for a single cylinder, T is the real-time temperature of a single cylinder, Pe is the rated power of the generator set, P1 is the set power of the generator set, P is the operating power of the generator set, D1 is the low temperature alarm threshold for a single cylinder, and D2 is the low temperature power reduction operating threshold for a single cylinder. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] This invention provides a technical solution: a protection method for multi-threshold graded early warning of single-cylinder temperature in a gas generator set, including a four-level early warning protection with four thresholds for high single-cylinder temperature and a two-level early warning protection with two thresholds for low single-cylinder temperature. The four-level early warning protection with four thresholds for high single-cylinder temperature includes an alarm prompting program, a power reduction operation program, an unloading shutdown program, and an emergency shutdown program, such as... Figure 1 As shown:

[0023] The alarm procedure for high single-cylinder temperature is as follows: After the control system starts running (F100), when the control system protection logic (F101) determines that the unit has started successfully, it enters the control system protection logic (F102). The programmable control system monitors the real-time temperature T of each single cylinder of the unit in real time. When the control system protection logic (F102) determines that the real-time temperature T of any single cylinder is greater than or equal to the single-cylinder high temperature alarm threshold G1, regardless of whether the unit is unloaded or loaded, the protection delay is activated. The protection delay is 3 seconds. If the real-time temperature T of the single cylinder is less than the single-cylinder high temperature alarm threshold G1 within the 3-second protection delay, the protection delay is reset to zero, there is no alarm output, and the system enters the control system protection logic (F103), and the unit continues to operate in the current state.

[0024] If the protection delay reaches 3 seconds, when the control system protection logic F102 determines that the real-time temperature T of a single cylinder is greater than or equal to the high alarm threshold G1 of a single cylinder, it enters the protection logic F104. When the protection logic F104 determines that the real-time temperature T of a single cylinder is less than the high power reduction operation threshold G2 of a single cylinder, it enters the protection logic F105. The programmable control system activates the alarm prompt, issuing audible and visual alarms. The audible alarm is a buzzer sound, and the visual alarm is accompanied by scrolling alarm text, and the temperature display of the corresponding alarm cylinder turns red and flashes.

[0025] The power reduction operation procedure for high single-cylinder temperature is as follows: After entering the control system protection logic F104, when protection logic F104 determines that the real-time temperature T of any single cylinder is greater than or equal to the single-cylinder high temperature power reduction operation threshold G2, it enters protection logic F106. When protection logic F106 determines that the real-time temperature T of a single cylinder is less than the single-cylinder high temperature unloading shutdown threshold G3, it enters protection logic F107. When protection logic F107 determines that the unit is unloaded or the unit's operating power P is less than or equal to 30% of the unit's rated power Pe, the programmable control system only activates the alarm prompt output.

[0026] When protection logic F107 determines that the unit's operating power P is greater than 30% of the unit's rated power Pe, it enters protection logic F108. The programmable control system activates reduced power operation and outputs an alarm. At the same time, the unit's set power P1 is assigned by the programmable control system to be 30% of the unit's rated power Pe. Within 45 seconds, the programmable control system controls the unit's operating power P to gradually decrease to the unit's set power P1, that is, to operate at 30% of the unit's rated power Pe.

[0027] The unloading and shutdown procedure for high single-cylinder temperature is as follows: After entering the control system protection logic F106, when protection logic F106 determines that the real-time temperature T of any single cylinder is greater than or equal to the single-cylinder high temperature unloading and shutdown threshold G3, it enters protection logic F109. When protection logic F109 determines that the real-time temperature T of a single cylinder is less than the single-cylinder high temperature emergency shutdown threshold G4, it enters protection logic F110. When protection logic F110 determines that the unit is unloaded or the unit's operating power P is less than or equal to 30% of the unit's rated power Pe, the programmable control system only activates the alarm prompt output.

[0028] When protection logic F110 determines that the unit's operating power P is greater than 30% of the unit's rated power Pe, it enters protection logic F111. The programmable control system activates load reduction and shutdown, and outputs an alarm. At the same time, the unit's set power P1 is assigned by the programmable control system to be 10% of the unit's rated power Pe. Within 60 seconds, the programmable control system controls the unit's operating power P to gradually decrease to the unit's set power P1, that is, 10% of the unit's rated power Pe. After the unit's operating power P decreases to 10% of the unit's rated power Pe, the programmable control system controls the unit to switch off and shut down.

[0029] The emergency shutdown procedure for high single-cylinder temperature is as follows: After entering the control system protection logic F109, when the protection logic F109 determines that the real-time temperature T of any single cylinder is greater than or equal to the single-cylinder high temperature emergency shutdown threshold G4, it enters the protection logic F112. Regardless of whether the unit is unloaded or loaded, the programmable control system outputs an alarm prompt and simultaneously issues an emergency shutdown control signal, controlling the unit's flow valve to close, the speed control valve to close, the ignition system to stop ignition, and the gas branch pipeline shut-off valve to close, thus shutting down the unit in an emergency.

[0030] The single-cylinder low temperature two-threshold two-level early warning protection includes an alarm prompt program and a power reduction operation program, such as... Figure 2 As shown:

[0031] The alarm procedure for low single-cylinder temperature is as follows: After the control system starts running (F200), when the control system protection logic (F201) determines that the unit has started successfully, it enters the control system protection logic (F202). The programmable control system monitors the real-time temperature T of each single cylinder of the unit in real time. When the control system protection logic (F202) determines that the real-time temperature T of any single cylinder is less than or equal to the low single-cylinder temperature alarm threshold D1, regardless of whether the unit is unloaded or loaded, the protection delay is activated. The protection delay is 3 seconds. If the real-time temperature T of the single cylinder is greater than the low single-cylinder temperature alarm threshold D1 within the 3-second protection delay, the protection delay is reset to zero, there is no alarm output, and the system enters the control system protection logic (F203), and the unit continues to operate in the current state.

[0032] If the protection delay reaches 3 seconds, when the control system protection logic F202 determines that the real-time temperature T of a single cylinder is less than or equal to the low temperature alarm threshold D1 of a single cylinder, it enters the protection logic F204. When the protection logic F204 determines that the real-time temperature T of a single cylinder is greater than the low temperature power reduction operation threshold D2 of a single cylinder, it enters the protection logic F205. The programmable control system activates the alarm prompt, issuing an audible and visual alarm. The audible alarm is a buzzer sound, and the visual alarm is accompanied by a scrolling alarm message. The temperature display of the corresponding alarm cylinder also turns red and flashes.

[0033] The power reduction operation procedure for low single-cylinder temperature is as follows: After entering the control system protection logic F204, when the protection logic F204 determines that the real-time temperature T of any single cylinder is less than or equal to the single-cylinder low temperature power reduction operation threshold D2, it enters the protection logic F206. When the protection logic F206 determines that the unit is unloaded or the unit's operating power P is less than or equal to 30% of the unit's rated power Pe, the programmable control system only activates the alarm prompt output.

[0034] When protection logic F206 determines that the unit's operating power P is greater than 30% of the unit's rated power Pe, it enters protection logic F207. The programmable control system activates reduced power operation and outputs an alarm. At the same time, the unit's set power P1 is assigned by the programmable control system to be 30% of the unit's rated power Pe. Within 45 seconds, the programmable control system controls the unit's operating power P to gradually decrease to the unit's set power P1, that is, to operate at 30% of the unit's rated power Pe.

[0035] This invention provides high protection accuracy and can effectively prevent under-protection or over-protection. By setting multiple protection threshold levels corresponding to different levels of protection actions, the protection levels are clear and the severity is reasonable, ensuring the safe operation of the gas generator set.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A protection method for multi-threshold graded early warning of single-cylinder temperature in a gas generator set, characterized in that: It includes a four-level early warning protection for high single-cylinder temperature with four thresholds and a two-level early warning protection for low single-cylinder temperature with two thresholds. The four-level early warning protection for high single-cylinder temperature with four thresholds includes an alarm prompting program, a power reduction operation program, an unloading shutdown program, and an emergency shutdown program. The two-level early warning protection for low single-cylinder temperature with two thresholds includes an alarm prompting program and a power reduction operation program. The alarm procedure for high single-cylinder temperature is as follows: if the single-cylinder temperature is greater than or equal to the high temperature alarm threshold, regardless of whether the unit is unloaded or under load, the protection delay is activated. If the single-cylinder temperature is less than the alarm threshold within the protection delay range, the protection delay is reset to zero, there is no alarm output, and the unit continues to operate in the current state. If, after the protection delay, the temperature of a single cylinder is greater than or equal to the alarm threshold but less than the high-temperature power reduction operation threshold, the programmable control system will activate the alarm and issue an audible and visual alarm. The power reduction operation procedure for high temperature in a single cylinder is as follows: if the temperature of a single cylinder is greater than or equal to the power reduction operation threshold for high temperature, and less than the unloading and shutdown threshold for high temperature, and if the unit is unloaded or the unit's operating power is less than or equal to 30% of the unit's rated power at this time, the programmable control system will only activate the alarm prompt output. If the unit's operating power is greater than 30% of the unit's rated power at this time, the programmable control system will activate power reduction operation and output an alarm. At the same time, the unit's set power will be assigned by the programmable control system to 30% of the unit's rated power. Within 45 seconds, the programmable control system will control the unit's operating power to gradually decrease to the unit's set power, that is, to operate at 30% of the unit's rated power. The unloading and shutdown procedure for high temperature in a single cylinder is as follows: if the temperature of a single cylinder is greater than or equal to the high temperature unloading and shutdown threshold, but less than the high temperature emergency shutdown threshold, and if the unit is unloaded or the unit's operating power is less than or equal to 30% of the unit's rated power at this time, the programmable control system will only activate the alarm prompt output. If the unit's operating power is greater than 30% of its rated power at this time, the programmable control system will activate load reduction and shutdown, and output an alarm. At the same time, the programmable control system will assign the unit's set power to 10% of the unit's rated power. Within 60 seconds, the programmable control system will control the unit's operating power to gradually decrease to the unit's set power, that is, 10% of the unit's rated power. After the unit's operating power decreases to 10% of the unit's rated power, the programmable control system will control the unit to switch off and shut down.

2. The protection method for multi-threshold graded early warning of single-cylinder temperature in a gas generator set according to claim 1, characterized in that: The emergency shutdown procedure for high single-cylinder temperature is as follows: when the single-cylinder temperature is greater than or equal to the high temperature emergency shutdown threshold, regardless of whether the unit is unloaded or under load, the programmable control system will output an alarm prompt and simultaneously issue an emergency shutdown control signal to control the unit's flow valve to close, the speed control valve to close, the ignition system to stop ignition, and the gas branch pipeline shut-off valve to close, thus shutting down the unit in an emergency.

3. The protection method for multi-threshold graded early warning of single-cylinder temperature in a gas generator set according to claim 1, characterized in that: The alarm procedure for low single-cylinder temperature is as follows: if the single-cylinder temperature is less than or equal to the low temperature alarm threshold, regardless of whether the unit is unloaded or loaded, the protection delay is activated. The protection delay is 3 seconds. If the single-cylinder temperature is greater than the low temperature alarm threshold within the 3-second protection delay, the protection delay is reset to zero, there is no alarm output, and the unit continues to operate in the current state. If, after a 3-second protection delay, the temperature of a single cylinder is less than or equal to the low temperature alarm threshold but greater than the low temperature power reduction operation threshold, the programmable control system will activate the alarm and issue an audible and visual alarm.

4. The protection method for multi-threshold graded early warning of single-cylinder temperature in a gas generator set according to claim 1, characterized in that: The power reduction operation procedure for low single-cylinder temperature is as follows: if the single-cylinder temperature is less than or equal to the low temperature power reduction operation threshold, and if the unit is unloaded or the unit's operating power is less than or equal to 30% of the unit's rated power at this time, the programmable control system will only activate the alarm prompt output. If the unit's operating power is greater than 30% of its rated power at this time, the programmable control system will activate reduced power operation and output an alarm. At the same time, the programmable control system will assign the unit's set power to 30% of its rated power. Within 45 seconds, the programmable control system will control the unit's operating power to gradually decrease to the unit's set power, that is, to operate at 30% of the unit's rated power.

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