Marine transportation fixing method for offshore facility gas turbine generator set

Abstract

The invention aims to provide a marine transportation fixing method for an offshore facility gas turbine generator set, and belongs to the field of offshore gas turbines.The marine transportation fixing method comprises the steps that a temporary support is arranged, connection of a corresponding pipeline, a generator and a main wire outlet box is disconnected in advance, and a complete set of set chassis is slowly and evenly jacked up; the whole set of unit is fixed on the temporary supporting structure, and the problem of potential safety hazards caused by shaking of the unit in the long-term marine transportation process is effectively solved. And meanwhile, the stress and the compression amount of the three-point supporting shock absorber AVM of the whole set of unit are reduced, the relative displacement between the whole underframe of the unit and the AVM in the marine transportation process is effectively limited, and the damage risk of the AVM in the marine transportation process is greatly reduced. The method is easy and convenient to operate, small in workload and free of hoisting requirements.

Description

Technical Field

[0001] The invention relates to a method for fixing a gas turbine generator set, in particular to a method for fixing an offshore gas turbine generator set. Background Art

[0002] A gas turbine generator set is a device that uses a gas turbine to drive a generator to generate electricity. It has high power generation efficiency and low emissions. It is widely used in ship power, industrial power generation and other fields. In the field of offshore oil and gas platforms, gas turbine generator sets are the main power source for offshore oil platforms. Their stability, reliability, economy and efficiency directly affect the safety and economic benefits of oil production.

[0003] However, during the transportation at sea, the gas turbine generator set will be affected by unstable factors such as sea breeze and waves, causing the hull and the gas turbine generator set to sway from side to side. Large fluctuations will increase the stress on the AVM, causing damage to the AVM (shock absorber) and creating a safety hazard. Summary of the invention

[0004] The object of the present invention is to provide a method for fixing an offshore gas turbine generator set by sea, which can enhance the fixing strength and reduce the risks and hidden dangers caused by marine transportation.

[0005] The object of the present invention is achieved in that:

[0006] The present invention provides a method for fixing an offshore gas turbine generator set by sea, which is characterized by:

[0007] (1) Evaluate the stress of the fixed components of the gas turbine generator set and derive the maximum lifting distance that the entire gas turbine generator set can withstand based on the maximum tolerable lifting amount of each component;

[0008] (2) Before lifting the gas turbine generator set, disconnect the external rigid connecting pipe section with large potential stress after lifting;

[0009] (3) Remove the connecting bolts between the generator set and the transition section of the external main junction box and the bolts of the flexible copper busbar in the middle;

[0010] (4) Arrange jacks evenly between the base frame and the base frame of the gas turbine generator set, and determine the lifting height based on the actual compression of the AVM;

[0011] (5) Preliminary addition of a temporary support seat, preliminary positioning, and installation of the connecting bolts of the temporary support seat from bottom to top;

[0012] (6) After arranging the jacks and temporary support structure, lift the gas turbine generator set evenly and measure the lifting distance with a dial indicator;

[0013] (7) Add rubber gaskets between the temporary support base and the gas turbine generator set base frame;

[0014] (8) Slowly lower the gas turbine generator set so that the weight of the gas turbine generator set falls on the temporary support structure. After the gas turbine generator set is fixed, re-evaluate the stress and re-determine the stress condition of the AVM;

[0015] (9) Protect the open pipe openings and provide temporary supports for pipes with larger diameters;

[0016] (10) If the AVM stress assessment meets the requirements, reinstall the connecting bolts between the generator and the transition section of the main junction box.

[0017] The present invention may also include:

[0018] 1. The fixed parts include the exhaust duct, the air inlet duct, the expansion joint of the air inlet duct and the rigidly connected duct.

[0019] 2. External rigid connection pipe sections with greater stress include the box anti-icing air duct, generator cooler return water pipe, generator cooler water supply pipe, generator lubricating oil return pipeline, and natural gas main pipeline.

[0020] 3. The specifications of the jack should be at least 1.5 times the safety factor based on the weight of the support point.

[0021] The advantages of the present invention are:

[0022] 1. Adding a temporary support seat can better fix the gas turbine generator set.

[0023] 2. It can effectively reduce the relative displacement and force of AVM (shock absorber) in all directions during sea transportation, and prevent AVM from suffering irreversible damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the main structure of a gas turbine generator set;

[0025] Figure 2 It is a top view schematic diagram of the gas turbine generator set body;

[0026] Figure 3 This is a schematic diagram of the arrangement of the jack and temporary support seat;

[0027] Figure 4 It is a schematic diagram of the transition section of the generator set and the main junction box. DETAILED DESCRIPTION

[0028] The present invention is described in more detail below with reference to the accompanying drawings:

[0029] Combination Figure 1-4 The gas turbine generator set involved in the present invention includes a generator 1, a main connection box 2, a gas turbine box 3, a base frame 4, an AVM (shock absorber) 5, an AVM (shock absorber) 6, an exhaust duct 7, an exhaust duct 8, an intake duct 9, an intake duct 10, a stand 11, a generator set and a main connection box transition section 12, a jack 13, a temporary support structure 14, a connecting bolt 15, and a connecting bolt 16.

[0030] Before being fixed by the fixing method of the present invention, the gas turbine generator set was originally connected to the chassis by the AVM shock absorber, using a three-point support method. At the edge of the chassis at the generator end, one AVM is placed on each side symmetrically along the axis, and at the chassis at the air intake end of the gas turbine case, one AVM is placed along the axis. This three-point support method is a common arrangement method in offshore platform application scenarios, which can provide good support for the unit during normal operation, and can also absorb certain deformations and small relative displacements caused by the thermal expansion of the unit. However, during long-term marine transportation, the unit may shake to a large extent. Due to its own structure and capacity limitations, the AVM cannot play a good fixing role, especially the large horizontal relative displacement, which may damage the AVM (shock absorber) and cause safety hazards. The present invention is to add temporary support to the chassis of the gas turbine generator set, which can reduce the irregular force of the AVM and play a better fixing role.

[0031] In this embodiment, the installation of a temporary support structure needs to be carried out through the following steps:

[0032] Step 1: Perform stress assessment on the fixed components of the gas turbine generator set, such as the exhaust duct 8, the intake duct 9, the expansion joint of the intake duct 10, and the rigidly connected pipes, and obtain the maximum lifting distance that the entire gas turbine generator set can withstand based on the maximum tolerable lifting amount of each component;

[0033] Step 2: Before lifting the gas turbine generator set, it is necessary to disconnect the external rigid connection pipe sections with large potential stress after lifting, including: box anti-icing air duct, generator cooler return water pipe, generator cooler water supply pipe, generator lubricating oil return pipeline, natural gas main pipeline, etc.;

[0034] Step 3: Remove the connecting bolts 15 between the generator set and the transition section 12 of the external main junction box and the bolts 16 of the flexible copper busbar connected in the middle;

[0035] Step 4: Arrange jacks 13 evenly between the base frame 11 and the base frame of the gas turbine generator set, and determine the lifting height according to the actual compression of the AVM (vibration damping platform), which is usually 2-3mm. It should be noted that the specifications of the jacks 13 should be at least 1.5 times the safety factor according to the weight of the supporting point;

[0036] Step 5: Preliminarily add a temporary support seat 14 and perform preliminary positioning. The connecting bolts of the temporary support seat 14 are installed from bottom to top;

[0037] Step 6: After arranging the jacks 13 and the temporary support structure 14, lift the gas turbine generator set evenly. The lifting distance can be measured with a dial indicator.

[0038] Step 7: Add a rubber gasket between the temporary support base 14 and the gas turbine generator set base frame 4;

[0039] Step 8: After all arrangements are completed, the gas turbine generator set is slowly lowered. At this time, the weight of the gas turbine generator set will fall on the temporary support structure 14. After the gas turbine generator set is fixed, the force assessment is re-performed to re-determine the force condition of the AVM;

[0040] Step 9: Properly protect the open pipe openings and set up temporary supports for pipes with larger diameters.

[0041] Step 10: If the AVM stress assessment meets the requirements, reinstall the connecting bolts 15 between the generator and the transition section 12 of the main junction box.

Claims

1. A method for fixing an offshore gas turbine generator set by sea, characterized in that: (1) Evaluate the stress of the fixed components of the gas turbine generator set and derive the maximum lifting distance that the entire gas turbine generator set can withstand based on the maximum tolerable lifting amount of each component; (2) Before lifting the gas turbine generator set, disconnect the external rigid connecting pipe section with large potential stress after lifting; (3) Remove the connecting bolts between the generator set and the transition section of the external main junction box and the bolts of the flexible copper busbar in the middle; (4) Arrange jacks evenly between the base frame and the base frame of the gas turbine generator set, and determine the lifting height based on the actual compression of the AVM; (5) Preliminary addition of a temporary support seat, preliminary positioning, and installation of the connecting bolts of the temporary support seat from bottom to top; (6) After arranging the jacks and temporary support structure, lift the gas turbine generator set evenly and measure the lifting distance with a dial indicator; (7) Add rubber gaskets between the temporary support base and the gas turbine generator set base frame; (8) Slowly lower the gas turbine generator set so that the weight of the gas turbine generator set falls on the temporary support structure. After the gas turbine generator set is fixed, re-evaluate the stress and re-determine the stress condition of the AVM; (9) Protect the open pipe openings and provide temporary supports for pipes with larger diameters; (10) If the AVM stress assessment meets the requirements, reinstall the connecting bolts between the generator and the transition section of the main junction box.

2. The method for fixing an offshore gas turbine generator set by sea according to claim 1, characterized in that: The fixed components include an exhaust duct, an air intake duct, an expansion joint portion of the air intake duct and a rigidly connected duct.

3. The method for fixing an offshore gas turbine generator set by sea according to claim 1 is characterized in that: The larger external rigid connecting pipe sections include the box anti-icing air duct, the generator cooler return water pipe, the generator cooler water supply pipe, the generator lubricating oil return pipeline, and the natural gas main pipeline.

4. The method for fixing an offshore gas turbine generator set by sea according to claim 1, characterized in that: The specifications of the jack should be at least 1.5 times the safety factor based on the weight of the supporting point.

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