Hydrogen quality monitoring system

Abstract

The hydrogen quality monitoring system comprises a hydrogen purifying module and a hydrogen supplementing module, an inlet of the hydrogen purification module is connected with the high-pressure side of the hydrogen-cooled generator set, and an outlet is connected in series with a first one-way valve and then connected with the low-pressure side of the hydrogen-cooled generator set to purify impurity gas in hydrogen; an outlet of the hydrogen supplementing module is connected in series with a second one-way valve and then connected with the low-pressure side of the hydrogen-cooled generator set, and high-purity hydrogen is supplemented into the low-pressure side of the hydrogen-cooled generator set; pressure gauges for monitoring hydrogen supplementing pressure are respectively connected or shared on connecting pipelines for connecting the hydrogen purification module and the hydrogen supplementing module with the low-pressure side of the hydrogen-cooled generator set; and the controller is used for collecting the hydrogen purity value and the pressure value of the generator set and controlling the hydrogen purification module or the hydrogen supplement module to start and stop when a preset condition is met or a trigger event occurs. Hydrogen can be purified in time according to pressure and purity changes of hydrogen in the generator set in real time, high-purity hydrogen is supplemented to stabilize the hydrogen quality of the generator, and the hysteresis quality of manual adjustment of hydrogen purity and pressure according to monitoring data is changed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydrogen-cooled generators and relates to a hydrogen quality monitoring system. BACKGROUND

[0002] With the development of social economy, the power consumption increases sharply, and the capacity of power plant generators also increases steadily. Hydrogen is an excellent cooling medium, and its application in the field of power generation is increasing. In the operation process of a hydrogen-cooled generator, hydrogen as a cooling medium is in contact with the electrical insulation of the stator winding of the generator at all times. Since hydrogen is flammable and explosive, the safe use of hydrogen is the top priority for each power plant, and the quality of hydrogen directly affects the safe operation of the generator set.

[0003] Generally, hydrogen concentration in air between 4% and 74% can cause explosion. According to the DL / T5027-93 “Typical Fire Protection Regulations for Electrical Equipment”, the purity and oxygen content of hydrogen in the hydrogen-cooled generator, its hydrogen-cooled system and hydrogen production equipment must be analyzed and tested according to the requirements of the regulations during operation. The hydrogen purity and oxygen content must meet the specified standards. The hydrogen purity in the hydrogen-cooled system must be not less than 96%, and the oxygen content must be not more than 2%. In the hydrogen production equipment, the hydrogen content of the gas must be not less than 99.5%, and the oxygen content must be not more than 0.5%. If the standards cannot be met, measures should be taken immediately until the standards are met.

[0004] When the generator set is normally operated, air enters the generator through the vacuum oil filter system or the sealed oil system, mixes with the hydrogen in the generator, and causes the oxygen content in the generator to rise. The currently operated hydrogen-cooled generator set does not have an effective deoxidation device to remove the oxygen in the hydrogen in the generator to the outside.

[0005] In addition, during normal operation of the generator, the pressure and purity of the hydrogen in the generator decrease due to leakage of the generator set, drainage and other reasons, which brings hidden dangers to the safe operation of the generator. At the present stage, when the purity or pressure of the hydrogen system of the generator set decreases to below the range specified in the relevant standards or regulations, the generator needs to be supplemented with an appropriate amount of high-purity hydrogen that meets the standards to ensure that the pressure and purity of the hydrogen in the generator are stable within the specified range, so that the hydrogen in the generator maintains a high purity, effectively reduces the wind friction loss, and improves the operating efficiency of the generator.

[0006] Currently, increasing the investment in large-scale generator sets is the development direction and focus of the power industry in China. Most large-scale generator sets use hydrogen as a cooling medium. In order to ensure the safe and reliable operation of the hydrogen-cooled generator set, the hydrogen control system, as one of the necessary auxiliary control systems of the generator set, is in urgent need of development.

[0007] At present, the hydrogen control system for monitoring the operation of the hydrogen-cooled generator set adopts the technical means of instrument monitoring data, and manually adjusts the changes of the hydrogen purity and pressure in the generator, which has the characteristics of hysteresis and uncertainty. SUMMARY

[0008] To solve the problems of the prior art, the hydrogen quality monitoring system can purify the hydrogen in the hydrogen-cooled generator system in real time according to the changes of the hydrogen pressure and purity in the generator set, supplement high-purity hydrogen to stabilize the hydrogen quality of the generator, improve the hydrogen gas quality in the generator set, and ensure the safe and efficient operation of the generator set.

[0009] To solve the above technical problems, the utility model adopts the following technical scheme,

[0010] A hydrogen quality monitoring system comprises a hydrogen purification module and a hydrogen supplement module,

[0011] The hydrogen purification module is connected with the high-pressure side hydrogen interface of the hydrogen-cooled generator set through the inlet, and is connected with the low-pressure side hydrogen interface of the hydrogen-cooled generator set through the outlet in series with the first one-way valve 14, and the impurity gas in the hydrogen is purified.

[0012] The outlet of the hydrogen supplement module is connected with the low-pressure side hydrogen interface of the hydrogen-cooled generator set through the second one-way valve 16, and high-purity hydrogen is also supplemented into the low-pressure side of the hydrogen-cooled generator set.

[0013] The third pressure gauge 13 for monitoring the hydrogen pressure supplemented into the generator set is connected with the connecting pipeline of the hydrogen purification module and the hydrogen supplement module connected with the low-pressure side of the hydrogen-cooled generator set.

[0014] The controller is further arranged to collect the hydrogen purity value and the pressure value of the generator set, and to control the start and stop of the hydrogen purification module and the hydrogen supplement module when the preset condition or the triggering event occurs.

[0015] The hydrogen purification module comprises the gas inlet pipeline 1 and the MEM assembly 7.

[0016] The gas inlet end of the gas inlet pipeline 1 is the inlet of the hydrogen purification module, and is connected with the high-pressure side hydrogen interface of the hydrogen-cooled generator set.

[0017] The purified gas outlet of the MEM assembly 7 is connected with the low-pressure side hydrogen interface of the hydrogen-cooled generator set through the purified gas output pipeline 12, and the first one-way valve 14 is arranged on the purified gas output pipeline 12.

[0018] The hydrogen purification MEM assembly 7 comprises a membrane separation device and various components installed at the gas inlet, purified gas outlet and discharge port of the membrane separation device to cooperate with each other to operate the membrane separation device. The gas inlet, purified gas outlet and discharge port of the membrane separation device are connected in series with the gas inlet pneumatic valve 6, purified gas outlet pneumatic valve 15 and discharge pneumatic valve 9, respectively. The inlet of the gas inlet pneumatic valve 6 is connected with the gas inlet pressure gauge 5. The discharge port of the MEM assembly 7 and the inlet of the discharge pneumatic valve 9 are communicated with the discharge port pressure gauge 8.

[0019] The discharge pipeline 11 is further included. The discharge port of the MEM assembly 7 is connected with the gas inlet of the discharge pipeline 11. The discharge pipeline 11 is connected in series with the discharge end flame arrester 10. The gas outlet of the discharge pipeline 11 is communicated with the atmosphere.

[0020] The booster device 3 adopts a compressor or a booster pump.

[0021] The gas outlet of the booster device 3 is connected in series with the first temperature gauge 4.

[0022] The first temperature gauge 4, gas inlet pressure gauge 5, discharge port pressure gauge 8 and third pressure gauge 13 have data remote transmission function.

[0023] The hydrogen supplement module includes a gas source providing high-purity hydrogen meeting the standard for the generator set and a high-purity hydrogen output main pipeline.

[0024] The gas source outlet is connected with the inlet of the high-purity hydrogen output main pipeline. The high-purity hydrogen output main pipeline is connected in series with the gas mass flow meter 18 monitoring the instantaneous flow and cumulative flow of the hydrogen supplement and the pneumatic regulating valve 17 adjusting the hydrogen supplement flow and pressure in sequence according to the gas flow direction. The gas outlet of the high-purity hydrogen output main pipeline is the outlet of the hydrogen supplement module.

[0025] The gas source is an electrolytic water hydrogen production module.

[0026] Specifically, the electrolytic water hydrogen production module includes a PEM electrolytic cell 23, a steam-water separator 21 and a hydrogen purification assembly 20.

[0027] The water inlet of the PEM electrolytic cell 23 is connected with the raw water inlet pipeline 26. The inlet of the raw water inlet pipeline 26 is introduced with raw water. The raw water inlet pipeline 26 is connected in series with a raw water quality detection instrument. The water outlet of the PEM electrolytic cell 23 is connected with the second temperature gauge 22.

[0028] Further, the raw water quality detection instrument includes a resistance meter 25 and a third temperature gauge 24.

[0029] The third temperature gauge 24 and the second temperature gauge 22 of the water outlet of the PEM electrolytic cell 23 have data remote transmission function.

[0030] Preferably, the raw water is the desalted water of a power plant.

[0031] The water outlet of the PEM electrolyzer 23 is connected to the inlet of the steam-water separator 21, the gas outlet of the steam-water separator 21 is connected to the gas inlet of the hydrogen purification assembly 20, and the gas outlet of the hydrogen purification assembly 20 is provided with the fourth pressure gauge 19.

[0032] The detection bypass is also included.

[0033] The detection bypass inlet is connected to the gas outlet of the hydrogen purification assembly 20, the hydrogen parameter detection instrument is connected in parallel or in series on the detection bypass, the detection bypass outlet 31 is communicated with the atmosphere, and the detection bypass inlet is provided with the valve 28 for controlling the flow interruption in series.

[0034] The gas outlet of the hydrogen purification assembly 20 is also connected to the discharge pipeline 34, the inlet of the discharge pipeline 34 is connected to the gas outlet of the hydrogen purification assembly 20 through a valve group or a composite valve, a third one-way valve 33 is arranged in series on the discharge pipeline 34, and the gas outlet of the hydrogen purification assembly 20 outputs the standard high-purity hydrogen through other ports of the valve group or the composite valve.

[0035] The valve group or the composite valve realizes the one or more selection function, the hydrogen gas at the gas outlet of the hydrogen purification assembly 20 is discharged through the discharge pipeline 34 or flows into the next stage through other ports of the valve group or the composite valve.

[0036] Specifically, when the hydrogen production parameters do not meet the expected target, the hydrogen gas at the gas outlet of the hydrogen purification assembly 20 is directly discharged through the discharge pipeline 34 under the control of the valve group or the composite valve; and when the hydrogen production parameters meet the expected target, the hydrogen gas at the gas outlet of the hydrogen purification assembly 20 is supplied to the generator set through the high-purity hydrogen output main pipeline under the control of the valve group or the composite valve.

[0037] Further, the fourth pressure gauge 19 at the gas outlet of the hydrogen purification assembly 20 has a remote transmission function.

[0038] Further, the hydrogen production parameter detection instrument includes a dew point monitor 29 and a hydrogen oxygen monitor 30.

[0039] Further, the bottom of the steam-water separator 21 is provided with a drain 27, and a liquid level gauge is arranged at the bottom of the inner cavity; when the liquid level detection value is higher than the upper limit value of the liquid level, the bottom drain 27 is opened; and when the liquid level detection value is lower than the lower limit value of the liquid level, the bottom drain 27 is closed.

[0040] The monitoring system for improving the quality of hydrogen gas in the generator set is provided, the hydrogen pressure and purity change in the generator set are monitored (the purity is monitored by a hydrogen purity instrument in the generator set), the impurity gas in the purified hydrogen gas is removed, the hydrogen purity of the hydrogen system in the generator set is improved, the hydrogen leakage and loss are compensated by supplementing a proper amount of standard high-purity hydrogen, the hydrogen pressure of the hydrogen cooling system of the generator set is stabilized, and the hydrogen purity is improved.

[0041] The hydrogen purification module removes other gases such as oxygen, nitrogen and carbon dioxide in the hydrogen system of the generator set, improves the purity of hydrogen, and guarantees efficient operation of the generator set. The hydrogen supplement module uses electrolysis of water to produce hydrogen, monitors the oxygen content and dew point of the produced hydrogen, supplies high-purity hydrogen meeting the specification requirements to the generator set, and at the same time, measures the hydrogen supplement amount, so as to balance the hydrogen loss or leakage of the generator set in daily operation, realize dynamic balance of the hydrogen pressure in the generator set, and compared with supplement of hydrogen in a bottle, reduce the transportation link of the bottled hydrogen. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a structural schematic diagram of the utility model;

[0043] Figure 2 is a structural schematic diagram of the hydrogen purification module and the hydrogen supplement module of the utility model. DETAILED DESCRIPTION

[0044] In order to make the technical problems, technical schemes and beneficial effects to be solved by the utility model more clearly understood, the utility model is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0045] A hydrogen quality monitoring system comprises a hydrogen purification module and a hydrogen supplement module,

[0046] The hydrogen purification module is connected with the high-pressure side hydrogen interface of the hydrogen-cooled generator set at the inlet, connected with the low-pressure side hydrogen interface of the hydrogen-cooled generator set at the outlet after being connected with the first one-way valve 14 in series, and removes impurity gases in the purified hydrogen;

[0047] The outlet of the hydrogen supplement module is connected with the low-pressure side hydrogen interface of the hydrogen-cooled generator set after being connected with the second one-way valve 16 in series, and high-purity hydrogen is supplemented into the low-pressure side of the hydrogen-cooled generator set;

[0048] The hydrogen purification module and the hydrogen supplement module are respectively connected or share a pressure gauge for monitoring the hydrogen pressure supplemented into the generator set on the connecting pipeline connecting the low-pressure side of the hydrogen-cooled generator set;

[0049] Further comprising a controller, which collects the hydrogen purity value and pressure value of the generator set, and controls the start and stop of the hydrogen purification module or the hydrogen supplement module when a preset condition or a triggering event occurs.

[0050] Specifically, the hydrogen purity value and pressure value of the generator set come from the purity and pressure monitoring instrument installed in the hydrogen system.

[0051] The preset conditions include but are not limited to, the real-time value of the hydrogen purity of the generator compared with the preset purity threshold value, triggering the start or stop of the hydrogen purification module; the real-time value of the hydrogen pressure of the generator compared with the preset pressure threshold value, triggering the start or stop of the hydrogen supplement module.

[0052] The triggering event includes,

[0053] The hydrogen temperature at the outlet of the pressurizing device 3 is higher than the first preset temperature value (49℃), triggering the stop of the hydrogen purification module;

[0054] The real-time temperature of the raw material water at the inlet of the PEM electrolytic cell 23 is higher than the second preset temperature range, or the electrical conductivity of the raw material water at the inlet of the PEM electrolytic cell 23 is higher than the preset electrical conductivity value, either of which triggers the stop of the hydrogen supplement module;

[0055] The dew point of the hydrogen at the outlet of the hydrogen purification assembly 20 is greater than the preset dew point value, or the oxygen content in the hydrogen at the outlet of the hydrogen purification assembly 20 is greater than the preset oxygen content value, either of which triggers the stop of the hydrogen supplement module.

[0056] In an embodiment, as Figure 1 The hydrogen purification module and the hydrogen supplement module share a third pressure gauge for monitoring the hydrogen supplement pressure on the connecting pipeline connecting the low-pressure side of the hydrogen-cooled generator set.

[0057] In an embodiment, the hydrogen purification module and the hydrogen supplement module are respectively connected with pressure gauges for monitoring the hydrogen supplement pressure on the connecting pipeline connecting the low-pressure side of the hydrogen-cooled generator set.

[0058] Embodiment of the hydrogen purification module.

[0059] The hydrogen purification module includes an inlet pipeline 1, a MEM assembly 7, a purified gas outlet pipeline 12,

[0060] The MEM assembly 7 purifies impurity gas in the hydrogen, the inlet end of the inlet pipeline 1 is the inlet of the hydrogen purification module, and is connected with the high-pressure side hydrogen interface of the hydrogen-cooled generator set. The inlet end of the inlet pipeline 1 is provided with an inlet pneumatic valve 2. The inlet pipeline 1 is connected in series with a pressurizing device 3. The outlet end of the inlet pipeline 1 is connected with the gas inlet of the MEM assembly 7. The purified gas outlet of the MEM assembly 7 is the purified gas outlet of the hydrogen purification module.

[0061] The purified gas outlet of the MEM assembly 7 is connected with the low-pressure side hydrogen interface of the hydrogen-cooled generator set through the purified gas outlet pipeline 12. The purified gas outlet pipeline 12 is provided with a first one-way valve 14. The outlet of the first one-way valve 14 is connected with a third pressure gauge 13.

[0062] The hydrogen purified by the MEM assembly 7 flows out from the purified gas outlet and is input into the low-pressure side of the hydrogen-cooled generator set through the purified gas output pipeline 12, and the third pressure gauge 13 monitors the hydrogen pressure supplemented into the generator set. The gas flowing out from the high-pressure side hydrogen interface of the hydrogen-cooled generator set is purified by the MEM assembly 7 and is input into the low-pressure side of the hydrogen-cooled generator set, and such circulation is implemented to realize the purification of hydrogen in the hydrogen-cooled generator set.

[0063] The hydrogen purification MEM assembly 7 adopts a membrane separation device, and the gas inlet, the purified gas outlet and the discharge port of the MEM assembly 7 are connected in series with the gas inlet end pneumatic valve 6, the purified gas outlet end pneumatic valve 15 and the discharge end pneumatic valve 9 respectively, the inlet of the gas inlet end pneumatic valve 6 is connected with the gas inlet pressure gauge 5, and the discharge port of the MEM assembly 7 and the inlet of the discharge end pneumatic valve 9 are communicated with the discharge port pressure gauge 8.

[0064] The hydrogen purification module further comprises a discharge pipeline 11, the discharge port of the MEM assembly 7 is connected with the gas inlet of the discharge pipeline 11, and the discharge end flame arrester 10 is connected in series on the discharge pipeline 11, and the outlet of the discharge pipeline 11 is communicated with the atmosphere.

[0065] The discharge port of the MEM assembly 7 is used for discharging the impurity gas after hydrogen purification. The impurity gas may also contain hydrogen, and it is necessary and feasible to connect the discharge end flame arrester 10 in series on the discharge pipeline 11.

[0066] The MEM assembly 7 adopts a membrane separation device, and a certain pressure needs to be maintained to realize hydrogen purification, so the gas inlet of the hydrogen purification MEM assembly 7 is communicated with the gas inlet pressure gauge 5, and the discharge port is communicated with the discharge port pressure gauge 8, so as to realize the pressure monitoring of the gas inlet and the discharge port of the MEM assembly 7, and also to be beneficial to the monitoring of the pressure difference between the gas inlet and the discharge port of the MEM assembly 7. The gas inlet end pneumatic valve 6, the purified gas outlet end pneumatic valve 15 and the discharge end pneumatic valve 9 are further arranged at the gas inlet, the purified gas outlet and the discharge port of the MEM assembly 7 to meet the pressure conditions of work.

[0067] It is feasible to start and stop the hydrogen purification module by arranging the inlet pneumatic valve 2 at the gas inlet end of the gas inlet pipeline 1, and the whole system is opened during operation.

[0068] The outlet of the purified gas output pipeline 12 of the hydrogen purification module is connected in series with the first one-way valve 14, which is feasible and necessary to prevent the reverse flow of gas and to make the purified hydrogen smoothly input into the low-pressure side of the hydrogen-cooled generator set. In addition, when the hydrogen purification module and the hydrogen supplement module jointly input hydrogen into the low-pressure side of the hydrogen-cooled generator set, the hydrogen supplemented by the hydrogen supplement module can also be prevented from flowing back to the hydrogen purification module. The outlet of the first one-way valve 14 on the purified gas output pipeline 12 is connected with the third pressure gauge 13, which monitors the hydrogen pressure supplemented into the low-pressure side of the generator.

[0069] The hydrogen purifying MEM assembly 7 adopts a membrane separation device.

[0070] Further, the outlet of the pressurizing device 3 is also connected in series with a first thermometer 4. The hydrogen temperature is monitored when the hydrogen purifying module is running. If the hydrogen temperature at the outlet of the pressurizing device 3 is higher than a first preset temperature value (49℃), the machine is triggered to stop.

[0071] Further, the inlet pressure gauge 5, the discharge port pressure gauge 8 and the third pressure gauge 13 all have data remote transmission functions.

[0072] Embodiment of the hydrogen supplementing module.

[0073] In an embodiment, the hydrogen supplementing module comprises a gas source providing high-purity hydrogen meeting the standard for the generator set and a high-purity hydrogen output main pipeline;

[0074] The outlet of the gas source is connected with the inlet of the high-purity hydrogen output main pipeline, and the high-purity hydrogen output main pipeline is connected in series with a gas mass flow meter 18 monitoring the instantaneous flow and cumulative flow of the hydrogen supplementing and a pneumatic regulating valve 17 adjusting the flow and pressure of the hydrogen supplementing in sequence according to the gas flow direction, and the outlet of the high-purity hydrogen output main pipeline is the outlet of the hydrogen supplementing module.

[0075] The outlet of the high-purity hydrogen output main pipeline is connected with the low-pressure side hydrogen interface of the hydrogen-cooled generator set after being connected in series with a second check valve 16, thereby supplementing the hydrogen for the hydrogen-cooled generator set, and the third pressure gauge 13 on the connecting pipeline monitors the hydrogen supplementing pressure.

[0076] In an embodiment, the gas source is high-purity hydrogen provided by an array of gas cylinders and output through a busbar.

[0077] In an embodiment, the gas source is a water electrolysis hydrogen production module.

[0078] The water electrolysis hydrogen production module comprises a PEM electrolytic cell 23, a steam-water separator 21 and a hydrogen purifying assembly 20.

[0079] The water inlet of the PEM electrolytic cell 23 is connected with a raw water inlet pipeline 26, the inlet of the raw water inlet pipeline 26 is introduced with raw water, and an instrument or sensor detecting the quality of the raw water is arranged on the raw water inlet pipeline 26 in series.

[0080] In the embodiment, the PEM electrolytic cell 23 is a water electrolysis hydrogen production device, and the raw water is preferably selected from desalted water of a power plant.

[0081] The instrument or sensor detecting the quality of the raw water comprises a resistance meter 25 and a third thermometer 24, which are used to monitor the electric conductivity and temperature of the introduced water so as to meet the quality requirement of the PEM electrolytic cell 23, i.e. the water electrolysis hydrogen production device, for the raw water.

[0082] The third temperature meter 24 is used to monitor the real-time temperature of the raw material water at the inlet of the PEM electrolyzer 23. If the temperature is higher than the second preset temperature range, the hydrogen supplement module will be shut down. The electric resistance meter 25 is used to monitor the electric conductivity of the raw material water at the inlet of the PEM electrolyzer 23. If the electric conductivity is higher than the preset electric conductivity value, the hydrogen supplement module will be shut down.

[0083] The outlet of the PEM electrolyzer 23 is connected to the inlet of the steam-water separator 21. The gas outlet of the steam-water separator 21 is connected to the gas inlet of the hydrogen purification assembly 20. The gas outlet of the hydrogen purification assembly 20 is provided with the fourth pressure meter 19.

[0084] The outlet of the PEM electrolyzer 23 is a mixture of hydrogen and water vapor. The water vapor is condensed and the hydrogen is separated through the steam-water separator 21. The hydrogen with high humidity after passing through the steam-water separator 21 can be purified through the hydrogen purification assembly 20 to obtain high-quality hydrogen. Specifically, the hydrogen purity value is greater than or equal to 99.9%, and the hydrogen dew point value is greater than or equal to -40℃.

[0085] The hydrogen dew point of the hydrogen outlet of the hydrogen purification assembly 20 is greater than the preset dew point value, which triggers the shutdown of the hydrogen supplement module. The unqualified hydrogen is not allowed to be supplemented into the generator. The oxygen content in the hydrogen outlet of the hydrogen purification assembly 20 is greater than the preset oxygen content value in the hydrogen, which triggers the shutdown of the hydrogen supplement module. The unqualified hydrogen is not allowed to be supplemented into the generator.

[0086] The gas outlet of the hydrogen purification assembly 20 is also connected with the fourth pressure meter 19 for monitoring the hydrogen pressure at the gas outlet of the hydrogen purification assembly 20. The normal operation of the hydrogen purification assembly 20 requires that the pressure value at the gas outlet is stable at the preset target value. During operation, the opening degree of the rear-stage pneumatic regulating valve 17 can be controlled according to the real-time pressure value change trend, so that the pressure value P is stable at the preset target value, i.e. the pressure value P = the rated hydrogen pressure of the generator set Pe + the pressure drop ΔP of the pneumatic regulating valve. The opening degree of the pneumatic regulating valve 17 can be controlled by the controller.

[0087] Further, the fourth pressure meter 19 at the gas outlet of the hydrogen purification assembly 20 has a remote transmission function.

[0088] Further, the second temperature meter 22 at the water outlet of the PEM electrolyzer 23 has a remote transmission function.

[0089] The electrolytic water hydrogen production module further includes a detection bypass and a discharge pipeline 34.

[0090] The gas inlet of the detection bypass is connected to the gas outlet of the hydrogen purification assembly 20. The hydrogen production parameter detection instrument is connected in parallel or in series on the detection bypass. The gas outlet of the detection bypass is connected to the atmosphere. The gas inlet of the detection bypass is provided with a valve 28 capable of controlling the flow.

[0091] The gas outlet of the hydrogen purification assembly 20 is also connected to a discharge pipeline 34, the gas inlet of the discharge pipeline 34 is connected to the gas outlet of the hydrogen purification assembly 20 through a valve group or a composite valve, a third one-way valve 33 is arranged in series on the discharge pipeline 34, and the gas outlet of the hydrogen purification assembly 20 outputs high-purity hydrogen through other ports of the valve group or the composite valve.

[0092] In the embodiment, the hydrogen production parameter detection instrument on the detection bypass includes a dew point monitor 29 and a hydrogen oxygen monitor 30, which are used to monitor the quality of the hydrogen supplement gas, meet the hydrogen supplement quality requirements of the hydrogen-cooled generator set, and can be connected in parallel or in series on the detection bypass. For example, Figure 1 In the embodiment, the two are connected in parallel, and as long as the two do not affect each other during detection, they can also be connected in series, which is not limited here. Further, it is feasible and necessary to adopt a needle valve for the valve 28 connected in series on the detection bypass to control the gas flow. By adjusting the opening degree of the needle valve, the gas flow of the detection pipeline is controlled to meet the parameter detection requirement. When the hydrogen produced by the hydrogen supplement module does not meet the hydrogen supplement quality, the hydrogen is discharged through the discharge pipeline 34.

[0093] As shown in the embodiment, Figure 1 The gas inlet of the discharge pipeline 34 is connected to the gas outlet of the hydrogen purification assembly 20 through a pneumatic two-position three-way valve 32. After the hydrogen purification assembly 20 purifies the hydrogen, the hydrogen parameters meet the expected target, the gas outlet of the hydrogen purification assembly 20 is connected to a high-purity hydrogen output main pipeline, and the hydrogen is supplied to the generator set. The pneumatic two-position three-way valve 32 can also be replaced by other valve groups or composite valves as long as the function of two or more options is realized, which is not limited here.

[0094] Further, the bottom of the steam-water separator 21 is provided with a drain port 27, and a liquid level meter is arranged at the bottom of the inner cavity. When the liquid level detection value is higher than the preset upper limit value of the liquid level, the bottom drain port is opened, and when the liquid level detection value is lower than the preset lower limit value of the liquid level, the bottom drain port is closed.

[0095] The controller adopts a PLC programmable logic controller.

[0096] When the signal output end of the controller is connected to the power plant DCS system, the feedback signal collected by the controller can also be connected to the power plant DCS system.

Claims

1. A hydrogen quality monitoring system, characterized by: Includes a hydrogen purification module and a hydrogen replenishment module; The hydrogen purification module has an inlet for connecting to the high-pressure side hydrogen interface of the hydrogen-cooled generator set, and an outlet for connecting to the low-pressure side hydrogen interface of the hydrogen-cooled generator set via a first check valve (14) to purify impurity gases in the hydrogen. The outlet of the hydrogen replenishment module is connected in series with the second check valve (16) and then connected to the low-pressure side hydrogen interface of the hydrogen-cooled generator set to replenish high-purity hydrogen into the low-pressure side of the hydrogen-cooled generator set. The hydrogen purification module and the hydrogen replenishment module are connected to the low-pressure side of the hydrogen-cooled generator set via connecting pipes, respectively, or together, pressure gauges for monitoring the hydrogen replenishment pressure. It also includes a controller for collecting hydrogen purity and pressure values ​​of the generator set and controlling the start and stop of the hydrogen purification module or hydrogen replenishment module when preset conditions are met or a trigger event occurs. The hydrogen purification module uses a membrane separation device.

2. The hydrogen quality monitoring system according to claim 1, characterized in that, The hydrogen purification module includes an intake pipe (1) and a MEM component (7). The inlet end of the inlet pipe (1) is the inlet of the hydrogen purification module. The inlet end of the inlet pipe (1) is equipped with an inlet pneumatic valve (2). A booster device (3) is connected in series on the inlet pipe (1). The outlet end of the inlet pipe (1) is connected to the inlet of the MEM component (7). The purified gas outlet of the MEM component (7) is the outlet of the hydrogen purification module. The MEM component (7) uses a membrane separation device.

3. The hydrogen quality monitoring system according to claim 2, characterized in that, The hydrogen purification MEM component (7) includes a membrane separation device and various components installed at the inlet, outlet and outlet of the membrane separation device to enable the membrane separation device to operate. The inlet pneumatic valve (6), the outlet pneumatic valve (15) and the outlet pneumatic valve (9) are connected in series at the inlet, outlet and outlet of the membrane separation device, respectively. The inlet of the inlet pneumatic valve (6) is connected to the inlet pressure gauge (5), and the outlet of the MEM component (7) and the outlet pneumatic valve (9) are connected to the outlet pressure gauge (8). It also includes an exhaust pipe (11), the exhaust port of the MEM component (7) is connected to the air inlet of the exhaust pipe (11), an exhaust end flame arrester (10) is connected in series on the exhaust pipe (11), and the air outlet of the exhaust pipe (11) is connected to the atmosphere.

4. The hydrogen quality monitoring system of claim 2, wherein, The booster equipment (3) uses a compressor or booster pump.

5. A hydrogen quality monitoring system according to claim 3, wherein The intake pressure gauge (5), the exhaust pressure gauge (8), and the third pressure gauge (13) have remote data transmission functions.

6. A hydrogen quality monitoring system according to claim 1 or 2, characterized in that, The hydrogen replenishment module includes a gas source that provides standard-compliant high-purity hydrogen to the generator set and a high-purity hydrogen output main pipeline; The gas source outlet is connected to the inlet of the high-purity hydrogen output main pipeline. The high-purity hydrogen output main pipeline is connected in series according to the gas flow direction to a gas mass flow meter (18) for monitoring the instantaneous flow rate and cumulative flow rate of hydrogen replenishment and a pneumatic regulating valve (17) for adjusting the hydrogen replenishment flow rate and hydrogen replenishment pressure. The outlet of the high-purity hydrogen output main pipeline is the outlet of the hydrogen replenishment module.

7. A hydrogen quality monitoring system according to claim 6, characterized in that, The gas source is a hydrogen production module by electrolysis of water; The hydrogen production module by electrolysis of water comprises a PEM electrolyzer (23), a steam-water separator (21), and a hydrogen purification assembly (20); The water inlet of the PEM electrolyzer (23) is connected to a raw water inlet pipeline (26), the inlet of the raw water inlet pipeline (26) is connected to raw water, and a raw water quality detector is arranged in series on the raw water inlet pipeline (26); the water outlet of the PEM electrolyzer (23) is connected to a second thermometer (22); The water outlet of the PEM electrolyzer (23) is connected to the inlet of the steam-water separator (21), the gas outlet of the steam-water separator (21) is connected to the gas inlet of the hydrogen purification assembly (20), and the gas outlet of the hydrogen purification assembly (20) is provided with a fourth pressure gauge (19); The hydrogen production module by electrolysis of water further comprises a detection bypass and a discharge pipeline (34); The gas inlet of the detection bypass is connected to the gas outlet of the hydrogen purification assembly (20), hydrogen production parameter detectors are connected in parallel or in series on the detection bypass, the gas outlet (31) of the detection bypass is connected to the atmosphere, and a valve (28) for controlling the flow is arranged in series at the gas inlet of the detection bypass; The gas outlet of the hydrogen purification assembly (20) is further connected to the discharge pipeline (34), the gas inlet of the discharge pipeline (34) is connected to the gas outlet of the hydrogen purification assembly (20) through a valve group or a composite valve, a third one-way valve (33) is arranged in series on the discharge pipeline (34), and the other port of the valve group or the composite valve connected to the gas outlet of the hydrogen purification assembly (20) is the gas source output; The valve group or the composite valve realizes a two-or-more-one function, when the hydrogen production parameters do not meet the expected target, the discharge pipeline (34) and the gas outlet of the hydrogen purification assembly (20) are connected, when the hydrogen production parameters meet the expected target, the gas outlet of the hydrogen purification assembly (20) outputs high-purity hydrogen.

8. The hydrogen quality monitoring system according to claim 7, characterized in that The fourth pressure gauge (19) at the gas outlet of the hydrogen purification assembly (20) has a remote transmission function.

9. The hydrogen quality monitoring system according to claim 7, characterized in that The hydrogen production parameter detectors comprise a dew point monitor (29) and a hydrogen oxygen monitor (30).

10. The hydrogen quality monitoring system according to claim 7, characterized in that The bottom of the steam-water separator (21) is provided with a drain (27), and a liquid level gauge is arranged at the bottom of the inner cavity; when the liquid level detection value is higher than the upper limit value of the liquid level, the bottom drain (27) is opened; and when the liquid level detection value is lower than the lower limit value of the liquid level, the bottom drain (27) is closed.

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