Isolation method of condensate pump

Abstract

The invention provides an isolation method for a condensate pump, which relates to the technical field of condensate water of thermal power generating units and comprises the following steps: step 1, stopping the condensate pump connected with a condenser, step 2, closing an outlet door, and step 3, closing an inlet door. And 4, the sealing water manual door is turned down (the sealing water pressure gauge is monitored to be not more than 0.6 MPa, and if the pressure rises, the sealing water manual door is turned down continuously). The problems that a thermal power plant condensation water system breaks down frequently, particularly, a condensation water pump inlet filter screen is blocked frequently and needs to be overhauled frequently, pressure relief water drainage and isolation overhauling are needed in the case of faults, but condensation water pump isolation has great safety risks such as condenser vacuum reduction and condensation water pump inlet pipeline overpressure damage occur are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of condensate water of thermal power units, and more specifically, particularly relates to an isolation method for a condensate water pump. Background Art

[0002] Condensate systems in thermal power plants are prone to failures, especially the condensate pump inlet filter is frequently clogged and often requires maintenance. When a failure occurs, it is often necessary to release pressure, drain water, and isolate for maintenance. However, isolating the condensate pump poses great safety risks, such as condenser vacuum drop and overpressure damage to the condensate pump inlet pipeline. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a condensate pump isolation method to solve the problems raised by the background technology.

[0004] The isolation method of the condensate pump of the present invention is achieved by the following specific technical means: A method for isolating a condensate pump comprises the following steps: Step 1: Deactivate the condensate pump connected to the condenser Step 2: Close the exit door. Step 3: Close the entry door.

[0005] Step 4: Close the sealing water manual valve (monitor the sealing water pressure gauge to ensure it does not exceed 0.6MPa. If the pressure rises, continue to close the sealing water manual valve).

[0006] Furthermore, in step 4, if the sealing water pressure gauge indicates below 0 MPa, it means that the inlet door or the air exhaust door is not tight, and filter cleaning is prohibited.

[0007] Furthermore, the inlet door, condensate pump and air extraction door are closed until the sealing water pressure gauge indicates a positive pressure before the filter can be cleaned.

[0008] Further; clean the inlet door filter, open the upper cover, monitor the outlet pressure and current of the running condensate pump to see if they are normal, check that the filter is full of water and slightly overflows, which serves as the inlet door water seal.

[0009] Furthermore; if there is no water overflowing from the filter, restore the upper end cover, adjust and open the manual sealing water door, tighten the inlet door and the air exhaust valve by hand until water overflows, and then clean the inlet door filter.

[0010] Furthermore; the condensate pump is not strictly isolated, causing leakage, open the outlet door by 5% to 10%, inject water into the inlet filter of the condensate pump until positive pressure is reached, keep the inlet filter of the condensate pump full of water, and ensure that the inlet door of the condensate pump has a good water seal; when the outlet electric door is opened, pay attention to prevent overpressure in the pump.

[0011] Furthermore; the system before the condensate pump is over-pressured; when the condensate pump is shut down and isolated, the sealing water pressure gauge 5 of the condensate pump indicates the pressure inside the pump body; when the condensate pump is shut down and the inlet electric door and the air exhaust valve are closed, the sealing water pressure should be controlled at around 0.1MPa, and it is prohibited to exceed 0.6MPa, because the condensate pump inlet pipe can withstand a pressure of 0.6MPa, otherwise the condensate pump sealing water manual door should be adjusted and closed.

[0012] Further, the condenser vacuum is represented by A, the leakage of the inlet door of the condensate pump 1 is represented by B, the pressure of the sealing water source is represented by C, and the pressure of the sealing water manual door is represented by D.

[0013] The condenser vacuum, the leakage of the condensate pump inlet door, the pressure of the sealing water source, and the pressure of the sealing water manual door will be different under different working conditions, and they need to be calculated through functions: The construction function is: D = k1 * A + k2 * B + k3 * C + k0 Among them, k1, k2, k3 are coefficients to be determined, and k0 is a constant.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. Ensure equipment safety: close the outlet door first and then the inlet door, and check that it is closed in place. This can effectively prevent the medium from flowing back, avoid impact and damage to the pump, and ensure the safe and stable operation of the equipment.

[0015] 2. Maintain system stability: The closed water to the pump seal flushing cooling water valve remains open, which helps maintain the normal operating temperature of the seal and prevents overheating from damaging the seal, thereby ensuring the sealing and stability of the system.

[0016] 3. Accurately control the pressure: Control the sealing water pressure by closing the manual valve of the mechanical sealing water to prevent damage to the equipment caused by excessive pressure, and avoid failure of the seal caused by excessive low pressure.

[0017] 4. Ensure maintenance safety: It is forbidden to clean the filter when the entrance door or the air exhaust door is not tight, and take corresponding measures to ensure that the sealing water pressure is positive. This can effectively avoid accidents during maintenance and ensure the safety of staff.

[0018] 5. Improve maintenance efficiency: Open the upper cover according to the correct process, monitor relevant parameters, and ensure that water overflows from the filter as a water seal, which can enable maintenance work to proceed smoothly, reduce unnecessary waiting and adjustment time, and improve maintenance efficiency.

[0019] 6. Flexibly respond to special situations: When the isolation is not tight and there is leakage, the outlet electric door is opened to inject water to maintain positive pressure, which provides an effective means to solve the abnormal situation and ensure that the equipment and system can return to normal as soon as possible.

[0020] 7. Prevent overpressure risks: Avoid system overpressure under any operating conditions, especially controlling the sealing water pressure when the condensate pump is shut down and isolated, which can protect pipelines and equipment from overpressure damage and extend their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the condensate pump process structure of the present invention.

[0022] In the figure, the corresponding relationship between the component names and the figure numbers is as follows: 1. Condensate pump; 2. Entrance door; 3. Exit door; 4. Sealed water manual door; 5. Sealing water pressure gauge; 7. Air exhaust valve. DETAILED DESCRIPTION

[0023] The present invention will be further described below in conjunction with specific embodiments, and the advantages and features of the present invention will become clearer as the description proceeds. However, these embodiments are exemplary only and do not constitute any limitation to the scope of the present invention. It should be understood by those skilled in the art that the details and forms of the technical solution of the present invention may be modified or replaced without departing from the spirit and scope of the present invention, but these modifications and replacements all fall within the scope of protection of the present invention.

[0024] Example: As attached Figure 1 As shown: The present invention provides a method for isolating a condensate pump, comprising the following steps: Step 1: Deactivate the condensate pump 1 connected to the condenser Step 2: Close the exit door 3, Step 3: Close entrance door 2.

[0025] Step 4: Close the sealing water manual valve 4 (monitor the sealing water pressure gauge 5 to ensure it does not exceed 0.6MPa. If the pressure rises, continue to close the sealing water manual valve 4).

[0026] Among them, in step 4, if the sealing water pressure gauge 5 indicates below 0 MPa, it means that the inlet door 2 or the air exhaust valve 7 is not tight, and the filter cleaning is prohibited.

[0027] Among them, close the inlet door 2, condensate pump 1 and air extraction valve 7, and the filter can be cleaned only after the sealing water pressure gauge 5 indicates positive pressure.

[0028] Among them, the filter screen of the entrance door 2 is cleaned, the upper cover is opened, the outlet pressure and current of the running condensate pump 1 are monitored to be normal, and the filter screen is checked to be full of water and slightly overflowing as the water seal of the entrance door 2.

[0029] If there is no water overflowing from the filter, restore the upper end cover, adjust and open the sealing water manual door 4, tighten the inlet door 2 and the air exhaust valve 7 by hand, and clean the filter of the inlet door 2 until water overflows.

[0030] Among them, the condensate pump 1 is not isolated strictly, causing leakage. Open the outlet door 3 by 5% to 10%, inject water into the inlet filter of the condensate pump 1 until positive pressure is reached, keep the inlet filter of the condensate pump 1 full of water, and ensure that the inlet door of the condensate pump 1 has a good water seal; when the outlet electric door 3 is opened, pay attention to prevent overpressure in the pump.

[0031] Among them, the system before the condensate pump 1 is over-pressured; when the condensate pump 1 is stopped and isolated, the sealing water pressure gauge 5 of the condensate pump 1 indicates the pressure inside the pump body; when the condensate pump 1 is stopped and the inlet electric door 2 and the air exhaust valve 7 are closed, the sealing water pressure should be controlled at about 0.1MPa, and it is prohibited to exceed 0.6MPa, because the inlet pipe of the condensate pump 1 can withstand a pressure of 0.6MPa, otherwise the sealing water manual door 4 of the condensate pump 1 should be adjusted and closed.

[0032] Among them, the condenser vacuum is represented by A, the leakage degree of the inlet door 2 of the condensate pump 1 is represented by B, the pressure of the sealing water source is represented by C, and the pressure of the sealing water manual door 4 is represented by D.

[0033] The condenser vacuum, the leakage degree of the inlet door 2 of the condensate pump 1, the pressure of the sealing water source, and the pressure of the sealing water manual door 4 will be different under different working conditions, and they need to be calculated through functions: The construction function is: D = k1 * A + k2 * B + k3 * C + k0 Among them, k1, k2, k3 are coefficients to be determined, and k0 is a constant.

[0034] In order to determine these coefficients and constants, different A, B, C values ​​and corresponding D values ​​are measured through multiple experiments, and then linear regression and other methods are used to solve them.

[0035] For example, three sets of experiments are conducted: Experiment 1: A = 10, B = 5, C = 20, D = 30 Experiment 2: A = 15, B = 8, C = 25, D = 40 Experiment 3: A = 20, B = 10, C = 30, D = 50 Substituting these three sets of data into the above function, we can get a set of equations: 30 = 10k1 + 5k2 + 20k3 + k0 40 = 15k1 + 8k2 + 25k3 + k0 50 = 20k1 + 10k2 + 30k3 + k0 By solving this system of equations, we can obtain the values ​​of k1, k2, k3 and k0, and thus determine the function.

[0036] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for isolating a condensate pump, characterized in that: The following steps are involved: Step 1: Deactivate the condensate pump (1) connected to the condenser Step 2: Close the exit door (3). Step 3: Close the entrance door (2). Step 4: Close the sealing water manual valve (4), (monitor the sealing water pressure gauge (5) to ensure it does not exceed 0.6 MPa. If the pressure rises, continue to close the sealing water manual valve (4)).

2. A condensate pump isolation method as claimed in claim 1, characterized in that: In step 4, if the sealing water pressure gauge (5) indicates below 0 MPa, it indicates that the inlet door (2) or the air exhaust valve (7) is not tight, and it is forbidden to clean the filter.

3. A condensate pump isolation method as claimed in claim 2, characterized in that: Close the inlet door (2), condensate pump (1) and air extraction door (7) until the sealing water pressure gauge (5) indicates positive pressure, and then clean the filter.

4. A condensate pump isolation method as claimed in claim 2, characterized in that: Clean the filter screen at the inlet door (2), open the upper cover, monitor the outlet pressure and current of the running condensate pump (1), and check that the filter screen is full of water and slightly overflows, which serves as the water seal for the inlet door (2).

5. A condensate pump isolation method as claimed in claim 4, characterized in that: If there is no water overflowing from the filter, restore the upper end cover, adjust and open the sealing water manual door (4), and manually tighten the inlet door (2) and the air exhaust valve (7) until water overflows, and then clean the filter of the inlet door (2).

6. A condensate pump isolation method according to claim 1, characterized in that: The condensate pump (1) is not isolated tightly, causing leakage. The outlet door (3) is opened by 5% to 10%, and the inlet filter of the condensate pump (1) is filled with water until positive pressure is reached. The inlet filter of the condensate pump (1) is kept full of water to ensure that the inlet door of the condensate pump (1) has a good water seal. When the outlet electric door (3) is opened, pay attention to prevent overpressure in the pump.

7. A condensate pump isolation method as claimed in claim 1, characterized in that: The system before the condensate pump (1) is over-pressurized; when the condensate pump (1) is shut down and isolated, the sealing water pressure gauge (5) of the condensate pump (1) indicates the pressure inside the pump body; when the condensate pump (1) is shut down and the inlet electric door (2) and the air extraction valve (7) are closed, the sealing water pressure should be controlled at about 0.1 MPa and should not exceed 0.6 MPa, because the inlet pipe of the condensate pump (1) can withstand a pressure of 0.6 MPa. Otherwise, the sealing water manual door (4) of the condensate pump (1) should be adjusted and closed.

8. A condensate pump isolation method as claimed in claim 1, characterized in that: The condenser vacuum is represented by A, the leakage degree of the inlet door (2) of the condensate pump (1) is represented by B, the pressure of the sealing water source is represented by C, and the pressure of the sealing water manual door (4) is represented by D. The condenser vacuum, the leakage of the inlet door (2) of the condensate pump (1), the pressure of the sealing water source, and the pressure of the sealing water manual valve (4) will be different under different working conditions, and they need to be calculated by the function: The construction function is: D=k1*A+k2*B+k3*C+k0 Among them, k1, k2, k3 are coefficients to be determined, and k0 is a constant.

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