Isolation method of sealing oil differential pressure valve

Abstract

The invention relates to an isolation method for a sealing oil differential pressure valve, which is used for isolating a single-side circulating water side of the sealing oil differential pressure valve and keeping normal circulation of circulating water on the other side of the sealing oil differential pressure valve, and comprises the following steps of: 1, stopping the differential pressure valve; 2, the differential pressure valve is put into operation; by gradually stopping and putting the differential pressure valve into operation, equipment damage or pressure impact caused by quick operation can be avoided, so that the risk of accidents is reduced. And meanwhile, through detailed step control, the oil hydrogen differential pressure is adjusted to a specific value, accurate operation of the differential pressure valve in the shutdown and commissioning processes can be ensured, and the stability of the system is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing oil for thermal power generation units, and in particular relates to an isolation method for a sealing oil differential pressure valve. Background Art

[0002] Sealing oil differential pressure valves in thermal power plants often malfunction, and during startup and shutdown operations, accidents in which the differential pressure valves are damaged due to improper operation often occur.

[0003] The generator sealing oil system is equipped with a differential pressure regulating valve. If the system oil pressure is 0.15MPa higher than the hydrogen pressure when the oil-hydrogen differential pressure valve is adjusted, the differential pressure valve may be opened too small, resulting in one-sided overpressure on the internal diaphragm, thereby causing damage to the differential pressure valve and loss of pressure regulating ability. Summary of the invention

[0004] (I) Purpose of the invention

[0005] In order to overcome the above shortcomings, the purpose of the present invention is to provide an isolation method for a sealing oil differential pressure valve to solve the above technical problems.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0008] A method for isolating a sealing oil differential pressure valve, isolating a single-side circulating water side of the sealing oil differential pressure valve and retaining normal circulation of circulating water on the other side of the circulating water side, comprises the following steps:

[0009] Step 1: Shut down the differential pressure valve.

[0010] Step 2, putting the differential pressure valve into operation;

[0011] The step 2 specifically includes the following steps:

[0012] c. After the inspection is completed, use the bypass manual door to adjust the oil-hydrogen differential pressure.

[0013] d. First open the manual door of the hydrogen side pressure pipe, and then open the manual door of the oil side pressure pipe.

[0014] c. Open the balance door of the oil-hydrogen differential pressure gauge on the 0-meter sealing oil instrument panel, add oil to the hydrogen side pressure pipe, and observe that the oil-hydrogen differential pressure gauge indicates a drop to close to 0;

[0015] d. After 5 minutes, close the balance door of the oil-hydrogen differential pressure gauge, check that the oil-hydrogen differential pressure gauge displays normal, and after calibrating it with the actual differential pressure, monitor the oil-hydrogen differential pressure through the oil-hydrogen differential pressure gauge.

[0016] e. Then fully open the rear gate of the differential pressure valve, gradually close the bypass gate of the differential pressure valve, and gradually open the front gate of the differential pressure valve to maintain the generator oil-hydrogen differential pressure at 50-60kPa until the bypass gate is fully closed and the front gate is fully opened.

[0017] Preferably, in step a, the differential pressure is adjusted to 56 kPa.

[0018] Preferably, in step c, the hydrogen side pressure-introducing pipe is oiled for 2-8 minutes.

[0019] Preferably, the actual differential pressure is 17 meters.

[0020] Preferably, the differential pressure valve shutdown step specifically includes:

[0021] A. First close the front valve of the differential pressure valve until the oil-hydrogen differential pressure decreases, then slowly open the bypass valve of the differential pressure valve until the oil-hydrogen differential pressure rises again. Repeat this operation until the front valve is fully closed, and use the bypass valve to adjust the oil-hydrogen differential pressure;

[0022] B. Then close the manual door on the oil side of the pressure-inducing pipe, and then close the manual door on the hydrogen side, and then close the valve behind the differential pressure valve, and then exit the differential pressure valve.

[0023] Preferably, a safety check is required before the differential pressure valve is shut down, and the relevant departments are notified to adjust the system operating parameters. The safety check includes:

[0024] Equipment inspection to ensure that there is no obvious damage or defects on the differential pressure valve and its ancillary equipment, including valves, pipes, joints and other accessories;

[0025] Pressure and temperature confirmation: before shutting down, confirm whether the pressure and temperature before and after the differential pressure valve are within the safe operating range;

[0026] Leakage check: check whether the differential pressure valve and its connecting pipes have leakage, especially in high temperature or high pressure environment;

[0027] Bypass system inspection: check whether the bypass system is in good condition to ensure that it can work normally during the shutdown of the differential pressure valve;

[0028] Safety device inspection: check whether safety devices such as safety valves and pressure relief valves are functioning normally to ensure they can start automatically in an emergency.

[0029] Beneficial effects:

[0030] The present invention can avoid equipment damage or pressure shock caused by rapid operation by gradually shutting down and commissioning the differential pressure valve, thereby reducing the risk of accidents. At the same time, by carefully controlling the steps and adjusting the oil-hydrogen differential pressure to a specific value, the accurate operation of the differential pressure valve during the shutdown and commissioning process can be ensured, thereby improving the stability of the system. The operation steps are optimized, and the time required for the shutdown and commissioning of the differential pressure valve is shortened, thereby reducing equipment downtime and improving production efficiency. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0032] The present invention provides a sealing oil differential pressure valve isolation method, which isolates a single-side circulating water side of the sealing oil differential pressure valve and keeps the circulating water on the other side circulating normally, comprising the following steps:

[0033] Step 1: Shut down the differential pressure valve.

[0034] The specific steps for stopping the differential pressure valve include:

[0035] A. First close the front valve of the differential pressure valve until the oil-hydrogen differential pressure decreases, then slowly open the bypass valve of the differential pressure valve until the oil-hydrogen differential pressure rises again, and maintain the generator oil-hydrogen differential pressure at about 56kPa. Repeat this operation until the front valve is fully closed, and use the bypass valve to adjust the oil-hydrogen differential pressure;

[0036] B. Then close the manual door on the oil side of the pressure-inducing pipe, and then close the manual door on the hydrogen side, and then close the valve behind the differential pressure valve, and then exit the differential pressure valve.

[0037] Step 2, putting the differential pressure valve into operation;

[0038] The step 2 specifically includes the following steps:

[0039] a. After the inspection is completed, use the bypass manual door to adjust the oil-hydrogen differential pressure to 56kPa

[0040] b. Open the manual door of the hydrogen side pressure pipe first, and then open the manual door of the oil side pressure pipe.

[0041] c. Open the balance door of the oil-hydrogen differential pressure gauge on the 0-meter sealing oil instrument panel, and inject oil into the hydrogen side pressure pipe. In step c, inject oil into the hydrogen side pressure pipe for 2-8 minutes, preferably for 5 minutes, and observe that the oil-hydrogen differential pressure gauge indicates a drop to nearly 0;

[0042] d. After 5 minutes, close the oil-hydrogen differential pressure gauge balance door, check that the oil-hydrogen differential pressure gauge shows normal, and calibrate it with the actual differential pressure. The actual differential pressure is 17 meters. Monitor the oil-hydrogen differential pressure through the oil-hydrogen differential pressure gauge.

[0043] e. Then fully open the rear gate of the differential pressure valve, gradually close the bypass gate of the differential pressure valve, and gradually open the front gate of the differential pressure valve to maintain the generator oil-hydrogen differential pressure at 50-60kPa. Preferably, maintain the generator oil-hydrogen differential pressure at about 56kPa until the bypass gate is fully closed and the front gate is fully opened.

[0044] The differential pressure valve needs to be inspected before it is shut down. The inspection before it is shut down helps to find potential problems, such as equipment damage, leakage, etc., which can be repaired before the problem leads to more serious consequences. Notifying the relevant departments to adjust the system operating parameters can ensure that the operation of the entire system will not be affected during the shutdown of the differential pressure valve, and maintain the balance and stability of the system.

[0045] The security check includes:

[0046] Equipment inspection to ensure that there is no obvious damage or defects on the differential pressure valve and its ancillary equipment, including valves, pipes, joints and other accessories;

[0047] Pressure and temperature confirmation: before shutting down, confirm whether the pressure and temperature before and after the differential pressure valve are within the safe operating range;

[0048] Leakage check: check whether the differential pressure valve and its connecting pipes have leakage, especially in high temperature or high pressure environment;

[0049] Bypass system inspection: check whether the bypass system is in good condition to ensure that it can work normally during the shutdown of the differential pressure valve;

[0050] Safety device inspection: check whether safety devices such as safety valves and pressure relief valves are functioning normally to ensure they can start automatically in an emergency.

[0051] The present invention can avoid equipment damage or pressure shock caused by rapid operation by gradually shutting down and commissioning the differential pressure valve, thereby reducing the risk of accidents. At the same time, by carefully controlling the steps and adjusting the oil-hydrogen differential pressure to a specific value, the accurate operation of the differential pressure valve during the shutdown and commissioning process can be ensured, thereby improving the stability of the system. The operation steps are optimized, and the time required for the shutdown and commissioning of the differential pressure valve is shortened, thereby reducing equipment downtime and improving production efficiency.

[0052] In this article, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0053] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for isolating a sealing oil differential pressure valve, characterized in that: Isolate the single-side circulating water side of the sealing oil differential pressure valve and keep the circulating water on the other side flowing normally, including the following steps: Step 1: Shut down the differential pressure valve. Step 2, putting the differential pressure valve into operation; The step 2 specifically includes the following steps: a. After the inspection is completed, use the bypass manual door to adjust the oil-hydrogen differential pressure. b. Open the manual door of the hydrogen side pressure pipe first, and then open the manual door of the oil side pressure pipe. c. Open the balance door of the oil-hydrogen differential pressure gauge on the 0-meter sealing oil instrument panel, add oil to the hydrogen side pressure pipe, and observe that the oil-hydrogen differential pressure gauge indicates a drop to close to 0; d. After 5 minutes, close the balance door of the oil-hydrogen differential pressure gauge, check that the oil-hydrogen differential pressure gauge displays normal, and after calibrating it with the actual differential pressure, monitor the oil-hydrogen differential pressure through the oil-hydrogen differential pressure gauge. e. Then fully open the rear gate of the differential pressure valve, gradually close the bypass gate of the differential pressure valve, and gradually open the front gate of the differential pressure valve to maintain the generator oil-hydrogen differential pressure at 50-60kPa until the bypass gate is fully closed and the front gate is fully opened.

2. A sealing oil differential pressure valve isolation method according to claim 1, characterized in that: In the step c, the hydrogen side pressure pipe is filled with oil for 2-8 minutes.

3. The isolation method of a sealing oil differential pressure valve according to claim 1, characterized in that: The actual differential pressure is 17 meters.

4. The isolation method of a sealing oil differential pressure valve according to claim 1, characterized in that: In step a, the oil-hydrogen differential pressure is about 56 kPa.

5. The isolation method of a sealing oil differential pressure valve according to claim 1, characterized in that: The specific steps for stopping the differential pressure valve include: A. First close the front valve of the differential pressure valve until the oil-hydrogen differential pressure decreases, then slowly open the bypass valve of the differential pressure valve until the oil-hydrogen differential pressure rises again, and maintain the generator oil-hydrogen differential pressure at about 56kPa. Repeat this operation until the front valve is fully closed, and use the bypass valve to adjust the oil-hydrogen differential pressure; B. Then close the manual door on the oil side of the pressure-inducing pipe, and then close the manual door on the hydrogen side, and then close the valve behind the differential pressure valve, and then exit the differential pressure valve.

6. The isolation method of a sealing oil differential pressure valve according to claim 1, characterized in that: Before the differential pressure valve is shut down, a safety check is required and the relevant departments are notified to adjust the system operating parameters. The safety check includes: Equipment inspection to ensure that there is no obvious damage or defects on the differential pressure valve and its ancillary equipment, including valves, pipes, joints and other accessories; Pressure and temperature confirmation: before shutting down, confirm whether the pressure and temperature before and after the differential pressure valve are within the safe operating range; Leakage check: check whether the differential pressure valve and its connecting pipes have leakage, especially in high temperature or high pressure environment; Bypass system inspection: check whether the bypass system is in good condition to ensure that it can work normally during the shutdown of the differential pressure valve; Safety device inspection: check whether safety devices such as safety valves and pressure relief valves are functioning normally to ensure they can start automatically in an emergency.