A device and method for preventing gas from mixing into a gas-water separator of a hydrogen dryer

Abstract

The present invention belongs to the technical field of operation and installation of electric power equipment, and specifically relates to a device and method for preventing gas from mixing into a hydrogen dryer gas-water separator; comprising: a hydrogen dryer gas-water separator, a plurality of diaphragm valves, a pipeline connection component, an automatic drainer, a metal drainage hose, a water collection tank, a drain valve, an end cap, an exhaust pipe A and an exhaust pipe B; one end of the hydrogen dryer gas-water separator is connected to the exhaust pipe A; one end of the automatic drainer is connected to the exhaust pipe B; the exhaust pipe A and the exhaust pipe B are connected through a pipeline connection component; a plurality of diaphragm valves are arranged on the exhaust pipe A; the bottom of the automatic drainer is connected to the drain valve. A drain port is arranged at the other end of the automatic drainer; the drain port is connected to one end of the metal drainage hose, and the other end of the metal drainage hose is connected to the water collection tank; an end cap is arranged at the port where the metal drainage hose is connected to the water collection tank.

Description

Technical Field

[0001] The invention belongs to the technical field of operation and installation of electric power equipment, and in particular relates to a device and a method for preventing gas from mixing into a gas-water separator of a hydrogen dryer. Background Art

[0002] Usually, before a hydrogen-cooled generator set is started, the stator cooling water system, sealing oil system and hydrogen system need to be prepared. After the hydrogen-cooled generator set is overhauled, the generator cavity needs to be filled with hydrogen before the generator is started. Generally, the inert gas replaces the air first, and then the inert gas is replaced with hydrogen to complete the system commissioning preparations. The inner cavity of the hydrogen-cooled unit generator is connected to some equipment, such as the hydrogen dryer for dehumidification of the generator hydrogen system. The hydrogen dryer is one of the important equipment to ensure that the humidity of the hydrogen in the generator is within the specified range, so the hydrogen-cooled unit often performs gas replacement work together with the hydrogen dryer.

[0003] In the prior art, the automatic drainage device needs to be removed before the generator hydrogen system is replaced with gas for purging, and the dead corners of the hydrogen dryer regeneration circuit need to be purged. After the hydrogen purge is completed, the automatic drainage device is reinstalled at the end of the hydrogen dryer regeneration circuit to ensure that the hydrogen dryer regeneration circuit can be automatically drained normally according to the operating conditions during the power operation of the hydrogen-cooled generator set. When the automatic drainage device connection pipe is removed, the device is exposed to the environment, air will enter the equipment, and bring the air into the hydrogen dryer. If the mixture of hydrogen and air reaches the explosion limit, there will be safety hazards.

[0004] Therefore, it is necessary to design a device and a method for preventing gas from mixing into the gas-water separator of the hydrogen dryer in view of the above technical problems, so as to improve the deficiencies of the above prior art. Summary of the invention

[0005] The purpose of the present invention is to design a device and method for preventing gas from mixing into the gas-water separator of a hydrogen dryer, so as to effectively solve the technical problem in the prior art that after the hydrogen cooling unit and the hydrogen dryer perform gas replacement work together, air is easily brought into the gas-water separator of the hydrogen dryer when an automatic drain gasifier is installed.

[0006] The technical solution of the present invention:

[0007] A device for preventing gas from mixing into a hydrogen dryer gas-water separator, comprising: a hydrogen dryer gas-water separator, a plurality of diaphragm valves, a pipeline connection component, an automatic drainer, a metal drainage hose, a water collecting tank, a drain valve, an end cap, an exhaust pipeline A and an exhaust pipeline B; one end of the hydrogen dryer gas-water separator is connected to the exhaust pipeline A; one end of the automatic drainer is connected to the exhaust pipeline B; the exhaust pipeline A and the exhaust pipeline B are connected through a pipeline connection component; the exhaust pipeline A is provided with a plurality of diaphragm valves; the bottom of the automatic drainer is connected to the drain valve;

[0008] The automatic drainer also includes: a float, a float connecting rod, a drain outlet baffle and a drain outlet; the float is arranged inside the automatic drainer through the float connecting rod, and the float is also connected to the drain outlet baffle; the other end of the automatic drainer is provided with a drain outlet; the drain outlet is connected to one end of a metal drain hose, and the other end of the metal drain hose is connected to the water collection tank; an end cap is also provided at the port where the metal drain hose is connected to the water collection tank.

[0009] The plurality of diaphragm valves are arranged in series on the exhaust pipe A; the number of the diaphragm valves is two.

[0010] The end cap is provided with an openable and closed cover, and the end cap is connected to the metal drainage hose in a detachable manner.

[0011] A method for preventing gas from mixing into a gas-water separator of a hydrogen dryer, using the device for preventing gas from mixing into a gas-water separator of a hydrogen dryer, the method comprises the following steps:

[0012] Step 1: Disassemble the hydrogen dryer gas-water separator and automatic drainer;

[0013] Step 2: Fill the automatic drain and metal drain hose with desalted water;

[0014] Step 3: Connect the hydrogen dryer gas-water separator to the automatic drainer for inflation and drainage.

[0015] The step one also includes: confirming that the hydrogen dryer gas-water separator is filled with hydrogen at a certain pressure, closing the two isolation valves, disassembling the exhaust pipe A and the exhaust pipe B through the pipe connecting components, removing the automatic drainer, closing the end cap on the metal drain hose, and closing the drain valve.

[0016] The step 2 comprises: adding a certain amount of desalted water into the automatic drainer from the place where the pipe connection component is disassembled, until the desalted water overflows from the breakpoint where the pipe connection component is disassembled, and confirming that there is no water leakage at the end cap. At this time, the float is affected by the buoyancy and, under the action of the connecting rod, drives the drainage baffle to detach from the drainage outlet, and the metal drainage hose is filled with desalted water.

[0017] The step three also includes:

[0018] Step 3.1: After connecting the exhaust pipe A and the exhaust pipe B through the pipe connection parts, open the opening and closing cover of the upper end cap of the metal drain hose and slowly open the two isolation valves;

[0019] Step 3.2: The desalted water in the automatic drainer floats the float, the drain outlet baffle is detached from the drain outlet, and part of the desalted water flows into the sump from the drain outlet through the metal drain hose. The amount of desalted water collected in the sump is less than the amount of desalted water added to the automatic drainer. After part of the desalted water in the automatic drainer flows out, the sum of the gravity of the float and the hydrogen pressure in the gas-water separator is greater than the buoyancy of the float, and the float sinks. At this time, the drain outlet baffle connected to the float blocks the drain outlet, and the desalted water in the automatic drainer cannot flow out, and the hydrogen in the automatic drainer cannot be discharged. At this time, there is only one gas and part of the desalted water in the automatic drainer; the metal drain hose with the end cap open and closed is placed below the water surface of the sump, which not only ensures the automatic drainage function of the hydrogen dryer regeneration circuit, but also monitors the working condition of the float of the automatic drainer;

[0020] If the float fails to return to its original position in step 3.2 or the baffle plate and the drain outlet are not sealed tightly, bubbles will emerge from the water in the sump. At this time, the inspection personnel can isolate the automatic steam trap by closing the two isolation valves, and then notify the maintenance personnel to eliminate the fault of the automatic steam trap.

[0021] Beneficial effects of the present invention:

[0022] (1) The device designed by the present invention is a device for preventing gas from mixing into the gas-water separator of the hydrogen dryer. It can solve the problem that after the automatic drainage device is reinstalled after the hydrogen dryer pipeline is purged, the automatic drainage device is prevented from introducing air into the gas-water separator of the hydrogen dryer by using an isolation valve, and at the same time, air is further prevented from entering the dryer regeneration circuit.

[0023] (2) The present invention designs a device to prevent gas from mixing into the gas-water separator of the hydrogen dryer. By optimizing the installation process of the automatic drainer, the uniformity of the gas in the gas-water separator of the hydrogen dryer and the dryer regeneration circuit is ensured, thereby ensuring the safety and reliability of the hydrogen-cooled generator set.

[0024] (3) The present invention is a device designed to prevent gas from mixing into the gas-water separator of the hydrogen dryer. By arranging two diaphragm valves between the automatic drainage device and the gas-water separator of the hydrogen dryer, the risk of hydrogen leakage and air inflow in the system can be effectively reduced during the period when the automatic drainage device is not installed and when the automatic drainage device is reinstalled. At the same time, the two diaphragm valves are used to isolate hydrogen, creating a safer working environment for operators during the disassembly and assembly of the automatic drainage device.

[0025] (4) The device designed by the present invention prevents gas from mixing into the gas-water separator of the hydrogen dryer, provides a monitoring means for verifying the working performance of the automatic drainer, and can indirectly monitor whether the baffle plate and the drain outlet of the automatic drainer have air leakage defects.

[0026] (5) The present invention is a device designed to prevent gas from mixing into the gas-water separator of the hydrogen dryer, which can be used to dismantle, install and repair the automatic drainer when the hydrogen dryer gas-water separator is in a hydrogen environment but is in a shutdown state.

[0027] (6) The gas medium in the gas-water separator of the hydrogen dryer of the present invention may be a gas other than hydrogen, and the mixed gas may be a gas other than air. The liquid medium in the automatic drainer may use a liquid medium other than water, and the liquid medium is incompatible with the mixed gas and the gas in the gas-water separator of the dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of a device for preventing gas from mixing into a gas-water separator of a hydrogen dryer according to the present invention;

[0029] Among them: 1-hydrogen dryer gas-water separator; 2-diaphragm valve; 3-pipeline connection parts; 4-automatic drainer; 5-float; 6-float connecting rod; 7-drain baffle; 8-drain; 9-metal drain hose; 10-water collecting tank; 11-drain valve; 12-end cap, 13-exhaust pipe A, 14-exhaust pipe B. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0031] Since the hydrogen dryer completes the replacement of air with inert gas and then replaces the inert gas with hydrogen together with the generator, the hydrogen dryer regeneration loop needs to be used as the end of the entire generator hydrogen system to perform dead-angle purge in this process.

[0032] Since the hydrogen dryer gas-water separator, diaphragm valve and connecting pipes in the hydrogen dryer regeneration circuit need to complete the dead corner purge work, the automatic drainer needs to be removed at this time to purge the hydrogen in the entire hydrogen dryer gas-water separator and pipeline. After the dead corner purge is completed, the automatic drainer is reinstalled. When reinstalling, air enters the automatic drain device. If it is not processed, the air will enter the hydrogen dryer regeneration circuit and then enter the generator hydrogen system. Therefore, the air inside the automatic drainer should be removed before connecting the automatic drainer to the hydrogen dryer gas-water separator.

[0033] A device for preventing gas from mixing into a hydrogen dryer gas-water separator, comprising: a hydrogen dryer gas-water separator 1, a plurality of diaphragm valves 2, a pipeline connecting component 3, an automatic drainer 4, a metal drainage hose 9, a water collecting tank 10, a drain valve 11, an end cap 12, an exhaust pipeline A13 and an exhaust pipeline B14; one end of the hydrogen dryer gas-water separator 1 is connected to the exhaust pipeline A13; one end of the automatic drainer 4 is connected to the exhaust pipeline B14; the exhaust pipeline A13 and the exhaust pipeline B (14) are connected through the pipeline connecting component 3; the exhaust pipeline A13 is provided with a plurality of diaphragm valves 2; the bottom of the automatic drainer 4 is connected to the drain valve 11;

[0034] The automatic drainer 4 also includes: a float 5, a float connecting rod 6, a drain outlet baffle 7 and a drain outlet 8; the float 5 is arranged inside the automatic drainer 4 through the float connecting rod 6, and the float 5 is also connected to the drain outlet baffle 7; the other end of the automatic drainer 4 is provided with a drain outlet 8; the drain outlet 8 is connected to one end of a metal drain hose 9, and the other end of the metal drain hose 9 is connected to the water collection tank 10; the port where the metal drain hose 9 is connected to the water collection tank 10 is also provided with an end cap 12.

[0035] A plurality of diaphragm valves 2 are arranged in series on the exhaust pipe A13; the number of the diaphragm valves 2 is two.

[0036] The end cap 12 is provided with an openable and closed cover, and the end cap 12 is connected to the metal drainage hose 9 in a detachable manner.

[0037] A method for preventing gas from mixing into a gas-water separator of a hydrogen dryer, using the device for preventing gas from mixing into a gas-water separator of a hydrogen dryer, the method comprises the following steps:

[0038] Step 1: Disassemble the hydrogen dryer gas-water separator 1 and the automatic drain 4; confirm that the hydrogen dryer gas-water separator 1 is filled with hydrogen at a certain pressure, close the two isolation valves 2, disassemble the exhaust pipe A13 and the exhaust pipe B14 through the pipe connecting component 3, remove the automatic drain 4, open and close the end cap 12 on the metal drain hose 9, and close the drain valve 11.

[0039] Step 2: Fill the automatic drain 4 and the metal drain hose 9 with desalted water; add a certain amount of desalted water into the automatic drain 4 from the place where the pipe connection component 3 is disassembled, until the desalted water overflows from the breakpoint where the pipe connection component 3 is disassembled, and confirm that there is no leakage at the end cap 12. At this time, the float 5 is affected by the buoyancy and, under the action of the connecting rod 6, drives the drainage baffle 7 to separate from the drain port 8, and the metal drain hose 9 is filled with desalted water.

[0040] Step 3: Connect the hydrogen dryer gas-water separator 1 to the automatic drainer 4 for inflation and drainage.

[0041] Step 3.1: After the exhaust pipe A13 and the exhaust pipe B14 are connected through the pipe connecting component 3, the opening and closing cover of the upper end cap 12 of the metal drain hose 9 is opened, and the two isolation valves 2 are slowly opened;

[0042] Step 3.2: The desalted water in the automatic drainer 4 floats the float 5, the drain baffle 7 is detached from the drain 8, and part of the desalted water flows from the drain 8 through the metal drain hose 9 into the sump 10. The amount of desalted water collected in the sump 10 is less than the amount of desalted water added to the automatic drainer 4. After part of the desalted water in the automatic drainer 4 flows out, the sum of the gravity of the float 5 and the hydrogen pressure in the gas-water separator 1 is greater than the buoyancy of the float 5, and the float 5 sinks. At this time, the drain baffle 7 connected to the float 5 blocks the drain 8, and the desalted water in the automatic drainer 4 cannot flow out, and the hydrogen in the automatic drainer 4 cannot be discharged. At this time, there is only one gas and part of the desalted water in the automatic drainer 4; the metal drain hose 9 with the end cap 12 open and closed is placed below the water surface of the sump 10, which not only ensures the automatic drainage function of the hydrogen dryer regeneration circuit, but also monitors the working condition of the automatic drain float 5;

[0043] If the float 5 fails to return to its original position or the drain baffle 7 and the drain 8 are not sealed tightly in step 3.2, bubbles will emerge from the water in the sump 10. At this time, the inspection personnel can isolate the automatic steam trap 4 by closing the two isolation valves 2 after discovering it, and then notify the maintenance personnel to eliminate the fault of the automatic steam trap 4.

[0044] The device and method for preventing gas from mixing into the gas-water separator of the hydrogen dryer of the present invention, the hydrogen purge work at the end of the gas-water separator of the hydrogen dryer, can ensure that the internal space of the hydrogen dryer regeneration circuit is 100% hydrogen after the end purge. After the dead corner purge of the equipment is completed, the automatic drainer is reinstalled with water by plugging the end cap of the metal drain hose, which completely prevents air from entering the interior of the hydrogen dryer gas-water separator and provides a safe pure hydrogen environment for the equipment. After the automatic drainer is reinstalled with desalted water, the end cap of the metal drain hose is opened, and the end of the metal drain hose with the end cap is submerged below the water surface of the sump. The operator can monitor the working performance of the automatic drainer through the bubbles in the water.

[0045] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. Any content not described in detail in the present invention can adopt the existing technology.

Claims

1. A method for preventing gas from mixing into a gas-water separator of a hydrogen dryer, characterized in that: A device for preventing gas from mixing into a hydrogen dryer gas-water separator is used, the device comprising: a hydrogen dryer gas-water separator (1), a plurality of diaphragm valves (2), a pipeline connection component (3), an automatic drainer (4), a metal drainage hose (9), a water collecting tank (10), a drain valve (11), an end cap (12), an exhaust pipe A (13) and an exhaust pipe B (14); one end of the hydrogen dryer gas-water separator (1) is connected to the exhaust pipe A (13); one end of the automatic drainer (4) is connected to the exhaust pipe B (14); the exhaust pipe A (13) and the exhaust pipe B (14) are connected via a pipeline connection component (3); the exhaust pipe A (13) is provided with a plurality of diaphragm valves (2); the bottom of the automatic drainer (4) is connected to the drain valve (11); The automatic drain (4) further comprises: a float (5), a float connecting rod (6), a drain outlet baffle (7) and a drain outlet (8); the float (5) is arranged inside the automatic drain (4) via the float connecting rod (6), and the float (5) is also connected to the drain outlet baffle (7); the other end of the automatic drain (4) is provided with a drain outlet (8); the drain outlet (8) is connected to one end of a metal drain hose (9), and the other end of the metal drain hose (9) is connected to a water collecting tank (10); an end cap (12) is also provided at the port of the metal drain hose (9) connected to the water collecting tank (10); The plurality of diaphragm valves (2) are arranged in series on the exhaust pipe A (13); the number of the diaphragm valves (2) is two; The method for preventing gas from mixing into a gas-water separator of a hydrogen dryer comprises the following steps: Step 1: Separate the hydrogen dryer gas-water separator (1) and the automatic drainer (4); Step 2: Fill the automatic drain (4) and the metal drain hose (9) with deionized water; Step 3: Connect the hydrogen dryer gas-water separator (1) to the automatic drainer (4) to perform aeration and drainage; The step 1 further comprises: confirming that the hydrogen dryer gas-water separator (1) is filled with hydrogen of a certain pressure, closing the two diaphragm valves (2), disconnecting the exhaust pipe A (13) and the exhaust pipe B (14) through the pipe connecting component (3), removing the automatic drainer (4), closing the opening and closing cover of the end cap (12) on the metal drain hose (9), and closing the drain valve (11); The second step comprises: adding a certain amount of desalted water into the automatic drain (4) from the disconnected portion of the pipe connection component (3) until the desalted water overflows from the disconnected portion of the pipe connection component (3), confirming that there is no water leakage at the end cap (12), at which time the float (5) is affected by the buoyancy and, under the action of the connecting rod (6), drives the drain outlet baffle (7) to separate from the drain outlet (8), and the metal drain hose (9) is filled with desalted water; The step three also includes: Step 3.1: After the exhaust pipe A (13) and the exhaust pipe B (14) are connected by the pipe connecting component (3), the opening and closing cover of the upper end cap (12) of the metal drain hose (9) is opened, and the two diaphragm valves (2) are slowly opened; Step 3.2: The desalted water in the automatic drain (4) floats the float (5), the drain outlet baffle (7) is detached from the drain outlet (8), and part of the desalted water flows from the drain outlet (8) through the metal drain hose (9) into the water collection tank (10). The amount of desalted water collected in the water collection tank (10) is less than the amount of desalted water added to the automatic drain (4). After part of the desalted water in the automatic drain (4) flows out, the sum of the gravity of the float (5) and the hydrogen pressure in the hydrogen dryer gas-water separator (1) is greater than the buoyancy of the float (5), and the float is (5) sinks, at which time the drain outlet baffle (7) connected to the float (5) blocks the drain outlet (8), the desalted water in the automatic drain (4) cannot flow out, and the hydrogen in the automatic drain (4) cannot be discharged. At this time, there is only one gas and part of the desalted water in the automatic drain (4); the metal drain hose (9) in the open state of the end cap (12) is placed below the water surface of the water collection tank (10), which not only ensures the automatic drainage function of the hydrogen dryer regeneration circuit, but also monitors the working condition of the float (5) of the automatic drain; If the float (5) fails to return to its original position in step 3.2 or the drain baffle (7) and the drain (8) are not sealed tightly, bubbles will emerge from the water in the sump (10). When the inspection personnel discover this, they can isolate the automatic drain (4) by closing the two diaphragm valves (2) and then notify the maintenance personnel to eliminate the fault in the automatic drain (4).

2. A method for preventing gas from mixing into a gas-water separator of a hydrogen dryer as claimed in claim 1, characterized in that: An openable and closable cover is provided on the end cap (12), and the end cap (12) is connected to the metal drainage hose (9) in a detachable manner.

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