CN214653632U - Hydrogen purification device for generator with automatic hydrogen supply system - Google Patents
Hydrogen purification device for generator with automatic hydrogen supply system Download PDFInfo
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- CN214653632U CN214653632U CN202022861333.7U CN202022861333U CN214653632U CN 214653632 U CN214653632 U CN 214653632U CN 202022861333 U CN202022861333 U CN 202022861333U CN 214653632 U CN214653632 U CN 214653632U
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Abstract
The utility model discloses a hydrogen purification device for generator with automatic hydrogen system that mends who belongs to gaseous purification field, including hydrogen purification system and automatic hydrogen system that mends, have purification generator hydrogen air conditioning and to the automatic function of mending hydrogen of generator. The hydrogen purification system is communicated with a hydrogen discharge port and a hydrogen return port of the generator, the hydrogen purification system comprises a physical adsorption purification system and a vacuumizing regeneration system, the physical adsorption purification system is used for adsorbing impurities in the hydrogen, and the vacuumizing regeneration system is used for vacuumizing regeneration of the physical adsorption purification system. The utility model discloses a hydrogen purification device for generator with automatic hydrogen system that mends can promote the hydrogen cold gas purity in the generator to more than 98%, reduces the hydrogen loss, effectively reduces the potential safety hazard that hydrogen explosion and artifical row mend hydrogen and introduce simultaneously, improves generating efficiency and operation security.
Description
Technical Field
The utility model belongs to the technical field of gaseous purification, specifically be a hydrogen purification device for generator with automatic hydrogen system that mends.
Background
At present, a thermal power generator with the power of 600MW and above basically adopts a water-hydrogen mode to cool a generator rotor. The purity of the hydrogen used for cooling directly affects the cooling effect of the rotor and further affects the efficiency and the operation safety of the generator. According to statistics, the purity of the cooling hydrogen of the power generator can be maintained to be more than 98% to ensure good cooling effect when more than 1000 domestic existing thermal power generator sets exist, but the purity of the existing cooling hydrogen is generally maintained to be 96% -97%.
Factors such as a sealing tile structure, hydrogen-oil pressure difference and improper adjustment of a balance valve can cause air to be mixed in the cooling hydrogen of the generator, so that the purity of the cooling hydrogen of the generator is reduced. The reduction in hydrogen purity generally produces a number of adverse effects, such as increased ventilation losses, reduced power generation efficiency, reduced generator winding insulation, corrosion of iron cores and metal parts, increased hydrogen explosion safety hazards (hydrogen can explode when exposed to fire when the oxygen content is greater than 3%), and the like. It is statistical that for 400MW, 600MW and 800MW generators, the wind friction loss increases in turn 107kW, 240kW and 366kW for every 1% reduction in hydrogen purity. In order to maintain the purity of hydrogen in the generator and ensure the safe operation of the generator, the power station needs to regularly discharge and supplement hydrogen to the generator, the hydrogen discharge aims at discharging low-purity hydrogen, potential safety hazards are reduced, and the hydrogen supplement aims at maintaining the purity and hydrogen pressure of the generator and ensuring the cooling effect. The hydrogen discharge and supplement operation increases the use cost of hydrogen and the complexity of running operation on the one hand, and more importantly, the hydrogen discharge and supplement operation is usually operated at night, and the fatigue of operators and the operation complexity introduce unsafe factors and create additional potential safety hazards.
In the existing hydrogen purification device, the physical adsorption material commonly used usually adopts a pure hydrogen purging mode under normal pressure to realize the regeneration of the physical adsorption material. For a thermal power generator, a certain hydrogen pressure level must be maintained during normal operation, and pure hydrogen purging consumes hydrogen of the power generator to reduce the hydrogen pressure, so that the hydrogen supplement frequency of the power generator is increased.
Based on the reasons, the hydrogen purification device with the automatic hydrogen supplementing system for the generator is urgently needed to be developed, the hydrogen consumption is reduced, the hydrogen purity of the generator is improved, meanwhile, the potential safety hazard caused by hydrogen explosion and manual hydrogen discharge and supplement is effectively reduced, and the power generation efficiency and the operation safety are improved.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the background art, the utility model provides a hydrogen purification device for generator with automatic hydrogen system that mends, a serial communication port, include: the inlet and outlet of the hydrogen purification system are respectively communicated with the hydrogen discharge port and the hydrogen return port of the generator; the hydrogen purification system comprises a physical adsorption purification system and a vacuumizing regeneration system which are connected, wherein an inlet of the hydrogen purification system, an outlet of the physical adsorption purification system and an outlet of the hydrogen purification system are sequentially connected; the physical adsorption purification system comprises at least two purification modules.
The hydrogen purification apparatus further comprises: the outlet of the automatic hydrogen replenishing system is connected with the hydrogen replenishing port of the generator, and the inlet of the automatic hydrogen replenishing system is connected with the hydrogen station of the power plant; the automatic hydrogen supplementing system comprises a hydrogen supplementing pressure sensor, a hydrogen supplementing purity monitor, a hydrogen supplementing mass flow controller and a control stop valve group which are sequentially connected.
The purification modules in the physical adsorption purification system are the same.
The physical adsorption purification system comprises a molecular sieve.
The vacuum regeneration system comprises a mechanical pump.
The hydrogen purification system also comprises a hydrogen discharge pressure sensor, a hydrogen discharge purity monitor, a hydrogen discharge mass flow controller and an oil removal system which are sequentially arranged between the inlet of the hydrogen purification system and the physical adsorption purification system.
The hydrogen purification system further comprises a hydrogen return purity monitor arranged between the physical adsorption purification system and the outlet of the hydrogen purification system.
The hydrogen purification device also comprises a safety control system, and the safety control system comprises an alarm system and a control system; when the hydrogen gas around the purification device exceeds a certain concentration, the alarm system is started; the control system is used for controlling the electric control and pneumatic parts of the hydrogen purification system and the automatic hydrogen supplement system.
The beneficial effects of the utility model reside in that:
1. the utility model discloses a hydrogen purification device for generator with automatic hydrogen system that mends, hydrogen cold gas is flowed by the row's hydrogen mouth of generator, gets into physical adsorption purification system after the deoiling system, and hydrogen cold gas after the purification flows back to the generator through the hydrogen mouth that returns of generator, continues to cool off generator rotor. The device can make the purity of hydrogen cooling air in the generator continuously be more than 98%, obviously reduce the hydrogen explosion hidden danger, and effectively improve the generating efficiency.
2. The utility model discloses an among the hydrogen purification device with automatic hydrogen system of meneing, physical adsorption purification system adopts evacuation system to realize adsorbing material's high regeneration, and the pure hydrogen mode of sweeping with traditional compares, and adsorption impurity on the physical adsorption material has been clear away to bigger degree, and then has guaranteed physical adsorption material's adsorption efficiency, has effectively reduced the consumption of hydrogen simultaneously, is showing the recycle rate who improves hydrogen.
3. The utility model discloses a hydrogen purification device with automatic hydrogen system of meneing still has automatic hydrogen function of mending, has avoided the artifical potential safety hazard of arranging the hydrogen introduction of mending, can show and improve generator operation security, has realized the purification of hydrogen, backward flow and the integration function of automatic hydrogen of mending.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the hydrogen purification device for a generator with an automatic hydrogen supply system of the present invention.
In the figure: 1-a hydrogen purification system, 2-an automatic hydrogen supplement system, 3-a safety control system and 10-a physical adsorption purification system; 20-vacuumizing the regeneration system; 30-oil removal system(ii) a 40-an exhaust hydrogen purity monitor; 50-a hydrogen return purity monitor; p1-a hydrogen discharge pressure sensor; MS (Mass Spectrometry)1-an exhaust hydrogen mass flow controller; 210-a hydrogen filling purity monitor; p2-a hydrogen-replenishment pressure sensor; MS (Mass Spectrometry)2-a hydrogen make-up mass flow controller; v1-a manual shut-off valve group; v2-an automatic shut-off valve; 100-a first purification module; 200-second purification module.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The embodiment of the present invention shown in fig. 1 comprises: the system comprises a hydrogen purification system 1 and an automatic hydrogen supplement system 2, wherein an inlet and an outlet of the hydrogen purification system 1 for adsorbing impurities are respectively communicated with a hydrogen discharge port and a hydrogen return port of a generator in a thermal power unit, and an inlet and an outlet of the automatic hydrogen supplement system 2 for automatically supplementing hydrogen to the generator are respectively communicated with a hydrogen supplement port of a hydrogen station of a power plant and a hydrogen supplement port of a generator in the thermal power unit; the hydrogen purification system 1 comprises a physical adsorption purification system 10 and a vacuumizing regeneration system 20 which are connected, wherein the inlet of the hydrogen purification system 1, the physical adsorption purification system 10 and the outlet of the hydrogen purification system 1 are sequentially connected; the physical adsorption purification system 10 comprises at least two purification modules, all of which are identical, an inlet of the vacuum-pumping regeneration system 20 is connected with all of the purification modules, and an outlet of the vacuum-pumping regeneration system 20 is used for exhausting waste gas.
In this embodiment, the physical adsorption purification system 10 includes two purification modules, namely a first purification module 100 and a second purification module 200, the first purification module 100 and the second purification module 200 are two identical physical adsorption purification modules, the first purification module 100 and the second purification module 200 remove impurities (mainly water, oxygen and nitrogen) in hydrogen gas by physical adsorption using an adsorption material with high specific surface area and high adsorption activity, when one of the purification modules 100 and 200 is in a purification state, the other is in a non-purification state, i.e. a regeneration or standby state, the two purification modules alternately enter a purification state, so as to ensure continuous purification of hydrogen cooling gas of the power generator. After the continuous operation for a period of time, the activity of the adsorption material in the purification module is gradually reduced, and the purification effect of hydrogen is further affected, so that the adsorption material needs to be activated and regenerated periodically to recover the service performance. Technicians usually adopt a pure hydrogen purging mode under normal pressure or reduced pressure (pressure between the normal pressure and the hydrogen pressure of the generator) to realize regeneration of the physical adsorption material, as mentioned above, not only can waste hydrogen gas, but also can reduce the hydrogen pressure of the generator and improve the hydrogen supplementing frequency, and further increase the potential safety hazard. The adsorption material in the regeneration-state purification module is highly regenerated by adopting a vacuumizing mode, pure hydrogen purging is not needed, and the consumption of hydrogen is greatly reduced, so that the hydrogen supplementing operation is reduced, and the safety of the generator is improved; in addition, impurities adsorbed by the adsorption material can be removed to a greater extent by utilizing a vacuumizing mode, so that the activity of the adsorption material is greatly improved, and the improvement of the purity of hydrogen is facilitated. The purification module after regeneration is finished enters a standby state to wait for switching; specifically, the molecular sieve is selected for use as the main material of first purification module 100 and second purification module 200, first purification module 100 and second purification module 200 that have used the molecular sieve are used for adsorbing water, oxygen and nitrogen in the hydrogen, the material that can be used for physical adsorption has a variety, like activated carbon, diatomaceous earth etc., consider adsorption effect, the molecular sieve can work at room temperature, safety ring protects, the reaction is swift, adsorption effect is good, and the rate of reuse is high, economic cost is low, and factors such as practicality and security have been guaranteed simultaneously.
In the present embodiment, the hydrogen purification system 1 further includes an oil removal system 30, and a hydrogen discharge pressure sensor P1An exhaust hydrogen purity monitor 40, a return hydrogen purity monitor 50 and an exhaust hydrogen mass flow controller MS1. Wherein, a hydrogen discharge pressure sensor P is arranged between the inlet of the hydrogen purification system 1 and the physical adsorption purification system 10 in sequence1A hydrogen discharge purity monitor 40, and a hydrogen discharge mass flow controller MS1And an oil removal system 30; the hydrogen return purity monitor 50 is arranged between the physical adsorption purification system 10 and the outlet of the hydrogen purification system 1; the oil removal system 30 is configured to discharge oil carried in the hydrogen cooling air, and in this embodiment, the oil removal system 30 specifically selects an oil removal fan, and removes oil impurities in the hydrogen gas by using a centrifugal method; hydrogen discharge pressure sensor P1The hydrogen pressure in the generator is monitored, and the automatic hydrogen replenishing system 2 is controlled to start and stop for automatic hydrogen replenishing; the exhaust hydrogen purity monitor 40 is used for monitoring the hydrogen purity in the generator and controlling the exhaust hydrogen mass flow controller MS1Automatically adjusting the flow of the hydrogen purification system 1; the hydrogen return purity monitor 50 is configured to monitor the purity of the hydrogen purified by the physical adsorption purification system 10, and determine the operating states of the first purification module 100 and the second purification module 200 in the physical adsorption purification system 10 according to the purity of the hydrogen; hydrogen mass flow controller MS1The hydrogen purification system is used for monitoring the gas flow of the hydrogen purification system 1 and automatically adjusting the gas flow of the hydrogen purification system 1 according to the feedback signal of the exhaust purity monitor 40.
In this embodiment, the vacuum-pumping regeneration system 20 is a mechanical pump, and when the vacuum-pumping regeneration system works, the mechanical pump pumps out impurities adsorbed by the adsorption material in the purification module in the regeneration state in the physical adsorption purification system 10 by pressure difference; preferably, the mechanical pump can achieve a vacuum of 10 degrees-1Pa magnitude, when the vacuum degree is reached, impurities in the adsorbing material can be effectively removed, and the effective adsorption rate of the adsorbing material is improved. In addition, other vacuum-pumping devices may be used to regenerate the adsorbent material.
In the present embodiment, the automatic hydrogen replenishment system 2 includes a hydrogen replenishment pressure sensor P connected in series2A hydrogen supply purity monitor 210 and a hydrogen supply mass flow controller MS2An automatic stop valve V2And a group of manual stop valve group V1. Wherein, a hydrogen-supplementing pressure sensor P is arranged at one side of the hydrogen-supplementing opening of the generator2The hydrogen supply purity monitor 210 is used for monitoring the hydrogen purity of the automatic hydrogen supply and the hydrogen supply mass flow controller MS2The hydrogen flow rate monitoring device is used for monitoring the hydrogen flow rate of automatic hydrogen supplement and can realize the function of automatically adjusting the flow rate. When the hydrogen purification device works, the manual stop valve group V1Always kept in an open state, and an automatic stop valve V2Pressure sensor P for discharged hydrogen1The feedback signal controls the start and stop of the automatic hydrogen supply system 2; in particular, a manual shut-off valve group V1Comprises a pair of manual stop valves connected in series; an automatic cutterCheck valve V2And a group of manual stop valve group V1And a control stop valve group is formed and used for opening and closing the hydrogen replenishing pipeline.
As an implementation manner, the hydrogen purification apparatus for a generator with an automatic hydrogen supply system in this embodiment further includes a safety control system 3, where the safety control system 3 includes an alarm system and a control system; the alarm system comprises a hydrogen leakage alarm and a forced exhaust system, when the hydrogen around the purification device exceeds a certain concentration, the hydrogen leakage alarm gives an alarm, and the forced exhaust system starts an exhaust mode; the control system is used for controlling the action of the whole hydrogen purification device for the generator, and comprises a physical adsorption purification system 10, a vacuum-pumping regeneration system 20, an oil removal system 30 and a hydrogen discharge pressure sensor P in the hydrogen purification system 11A hydrogen discharge purity monitor 40, a hydrogen return purity monitor 50, a hydrogen discharge mass flow controller MS1And a hydrogen replenishing pressure sensor P in the automatic hydrogen replenishing system 22A hydrogen supply purity monitor 210 and a hydrogen supply mass flow controller MS2Automatic stop valve V for hydrogen supply2The electric control and pneumatic part of the system enables the system to realize the full-automatic unattended function.
The hydrogen purification device with the automatic hydrogen supplementing system for the generator in the embodiment has good purification effect, and can continuously maintain the concentration of hydrogen cold air of the generator>98%, water dew point lower than-50 ℃, oxygen content lower than 10ppm, nitrogen content less than 2% (volume%); the purification rate is controllable, and the treatment capacity of the hydrogen for cooling can reach 1-30Nm3H; the vacuumizing regeneration system avoids hydrogen loss caused by pure hydrogen purging under normal pressure or reduced pressure (pressure between normal pressure and hydrogen pressure of the generator); the automatic hydrogen supplementing system can automatically supplement hydrogen according to the hydrogen pressure change of the generator, thereby avoiding the potential safety hazard caused by manual hydrogen discharge and supplement and effectively improving the efficiency and the operation safety of the generator.
The following describes the operation of the hydrogen purification device for a generator with an automatic hydrogen supply system in this embodiment by using a specific operation method:
s100, discharging low-purity hydrogen with the concentration of 96.5% from a hydrogen discharge port of the generator;
s200, low purity hydrogen gas in 10Nm3The flow of/h is firstly passed through an oil removing fan 30 to remove oil impurities;
s300, the hydrogen deoiled by the deoiling fan enters a physical adsorption purification system 10 to remove water, oxygen and nitrogen impurities at room temperature;
and S400, high-purity hydrogen flows back to the generator through a pipeline to cool the rotor of the generator.
In S300, the hydrogen gas deoiled by the oil removal fan 30 enters the purification module in the purification state in the physical adsorption purification system 10, and the purification module specifically includes:
s301, at the moment, the first purification module 100 is in a purification state, so that the hydrogen subjected to deoiling by the deoiling fan enters the first purification module 100; meanwhile, the second purification module 200 is in a non-purification state, the purification module 200 which is just switched to enter the non-purification state enters a regeneration state, and meanwhile, the mechanical pump (the vacuumizing regeneration system 20) is started to highly regenerate the molecular sieve in the second purification module 200; after regeneration is completed, the second purification module 200 enters a standby state;
s302, monitoring the purity of the hydrogen purified by the first purification module 100 by a hydrogen return purity monitor, switching the first purification module 100 to a regeneration state when the purity of the hydrogen is less than or equal to 98.5%, regenerating the first purification module 100 by a vacuumizing regeneration system, and switching the purification module 200 to the purification state at the same time; the first purification module 100 enters a standby state after regeneration is completed;
s303, returning to S301, wherein the first purification module 100 and the second purification module 200 are always in an alternative working state;
during the purification process, the hydrogen purity monitor 40 monitors the generator hydrogen purity and controls the hydrogen discharge mass flow controller MS according to the purity1The gas flow output by the hydrogen purification system 1 is adjusted, the flow is smaller when the purity is higher, the flow is larger when the purity is lower, and the flow control range is 1-30Nm3/h；
In this example, the pressure is used as the criterion for completing the regeneration of the molecular sieve height, and when the pressure reaches 10-1And when the pressure is in the Pa magnitude, the regeneration is completed, the pressure magnitude is maintained, and the standby state is entered.
Concurrently with S100, S110:
s110, opening the manual stop valve group V1When the hydrogen discharge pressure sensor P1When the hydrogen pressure of the generator is detected to be less than or equal to 385kPa, the automatic stop valve V of the automatic hydrogen supply system is started2Starting to automatically supplement hydrogen;
s120, as hydrogen exhaust pressure sensor P1When the hydrogen pressure of the generator is detected to be more than or equal to 400kPa, the automatic stop valve V is closed2And completing automatic hydrogen supplement.
In the process of automatic hydrogen supplement, a hydrogen supplement pressure sensor P2The hydrogen supply purity monitor 210 is used for monitoring the hydrogen purity of the automatic hydrogen supply and the hydrogen supply mass flow controller MS2The hydrogen flow rate monitoring device is used for monitoring the hydrogen flow rate of automatic hydrogen supplement and can realize the function of automatically adjusting the flow rate.
After the hydrogen is purified by adopting the steps, the dew point of hydrogen water at the outlet of the device is-52 ℃, the oxygen content is 8ppm, and the nitrogen content is less than 0.50 percent (volume percent); the purity of the cooling hydrogen in the generator reaches 99 percent (volume percent).
The above-mentioned embodiments are only used for illustrating the embodiments of the present invention and explaining the technical features of the present invention, and are not used to limit the protection scope of the present invention. Any modification or equivalent arrangement which can be easily implemented by a person skilled in the art is within the scope of the present invention, which is to be determined by the following claims.
Claims (7)
1. The utility model provides a hydrogen purification device for generator with automatic hydrogen system that mends which characterized in that includes: the inlet and outlet of the hydrogen purification system (1) are respectively communicated with a hydrogen discharge port and a hydrogen return port of the generator; the hydrogen purification system (1) comprises a physical adsorption purification system (10) and a vacuumizing regeneration system (20) which are connected, wherein the inlet of the hydrogen purification system (1), the physical adsorption purification system (10) and the outlet of the hydrogen purification system (1) are sequentially connected; the physical adsorption purification system (10) includes at least two purification modules.
2. The hydrogen purification device with an automatic hydrogen replenishing system for the generator according to claim 1, wherein the hydrogen purification device further comprises: the outlet of the automatic hydrogen supplementing system (2) is connected with a hydrogen supplementing port of the generator, and the inlet of the automatic hydrogen supplementing system (2) is connected with a hydrogen station of a power plant; the automatic hydrogen replenishing system (2) comprises hydrogen replenishing pressure sensors (P) connected in sequence2) A hydrogen supply purity monitor (210) and a hydrogen supply mass flow controller (MS)2) And a control stop valve group.
3. The hydrogen purification device with automatic hydrogen replenishing system for the generator as claimed in claim 1, wherein the purification modules in the physical adsorption purification system (10) are the same.
4. The apparatus for purifying hydrogen gas for generator with automatic hydrogen supplement system as claimed in claim 1, wherein said vacuum regeneration system (20) comprises a mechanical pump.
5. The hydrogen purification device with automatic hydrogen supply system for the generator as claimed in claim 1, wherein the hydrogen purification system (1) further comprises a hydrogen discharge pressure sensor (P) sequentially arranged between the inlet of the hydrogen purification system (1) and the physical adsorption purification system (10)1) A hydrogen discharge purity monitor (40), a hydrogen discharge mass flow controller (MS)1) And an oil removal system (30).
6. The hydrogen purification device with the automatic hydrogen supplementing system for the generator as claimed in claim 1, wherein the hydrogen purification system (1) further comprises a hydrogen return purity monitor (50) disposed between the physical adsorption purification system (10) and the outlet of the hydrogen purification system (1).
7. The hydrogen purification device with automatic hydrogen supplement system for generator according to any one of claims 1-6, wherein the hydrogen purification device further comprises a safety control system (3), the safety control system (3) comprises an alarm system and a control system; when the hydrogen gas around the purification device exceeds a certain concentration, the alarm system is started; the control system is used for controlling the electric control and pneumatic parts of the hydrogen purification system (1) and the automatic hydrogen supplement system (2).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112357882A (en) * | 2020-12-02 | 2021-02-12 | 有研工程技术研究院有限公司 | Hydrogen purification device for generator with automatic hydrogen supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112357882A (en) * | 2020-12-02 | 2021-02-12 | 有研工程技术研究院有限公司 | Hydrogen purification device for generator with automatic hydrogen supply system |
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