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Thermal insulation solution for power plant

Date：2016/8/27 views:1013

Thermal power plants is the use of coal, oil, natural gas or other fuel chemical energy to produce electricity. The generator set of thermal power plant is composed of boiler, steam turbine and generator and many auxiliary equipment pipes.

Common thermal insulation materials for power plants
Power plant external insulation materials: aluminum silicate fiber blanket, rock wool, glass wool, silicate board, felt, shell, board, cloth, calcium silicate board, shell, aerogel composite insulation felt.
Other refractory materials for thermal insulation of power plant: acid-resistant castable, wear-resistant castable, various light and heavy castable, refractory brick and thermal insulation brick.
Partition heat insulation solution for thermal insulation system of power plant
The key of thermal insulation in power plant is to divide it into three main parts according to the application division, and then design the thermal insulation scheme respectively.
● high temperature heat insulation solution for boiler main body of power plant
Power plant boiler insulation, including boiler body and some auxiliary equipment. After the fuel is burnt in the hearth of the boiler, heat energy is released, water in the boiler is converted into superheated steam with certain pressure and temperature through heat transfer on the metal wall surface, and then the steam is sent to a steam turbine, and the steam turbine drives the generator to generate electricity.
The superheated steam temperature in the boiler is 540 C..
1 > power plant boiler body insulation scheme
Thermal insulation layer of boiler body in power plant is mainly composed of high temperature anticorrosive coating ( anticorrosive coating ) + 100 mm rock wool felt or ceramic fiber blanket ( insulation layer ) + galvanized loose wire mesh ( binding layer ) + plastering fabric ( plastering layer ) + ceramic fiber blanket cloth ( protective layer b ) + glass fiber cloth ( protective layer a ) + aluminum powder heat-resistant paint ( surface layer ).
2 > other insulation parts of the thermal insulation system of power plant boiler insulation structure selection materials
Boiler water wall insulation: alumina brick + rock wool board
Top cover insulation: ceramic fiber + rock wool board
Top heat preservation of large roof cover: refractory castable
Furnace header insulation: ceramic fiber board, ceramic fiber blanket
Drum insulation material: ceramic fiber blanket + rock wool board
Downcomer insulation: ceramic fiber board, ceramic fiber blanket + rock wool board
Heat preservation of furnace wall at smoke folding corner: ceramic fiber module, ceramic fiber blanket + rock wool board
Air preheater insulation materials: ceramic fiber board, ceramic fiber module, ceramic fiber blanket + rock wool
Boiler hot air duct insulation: ceramic fiber blanket insulation + rock wool
Boiler flue heat preservation: ceramic fiber module heat preservation, ceramic fiber blanket + rock wool
Electric dust insulation: rock wool board
● High temperature heat insulation solution for steam turbine

Turbine is a kind of rotary power machine, its main task is to convert the heat energy of steam into mechanical energy.
It is very important for the thermal economy and long-term operation safety of steam turbine unit whether the structure design of steam turbine thermal insulation device is correct and reasonable and whether the selection of thermal insulation materials is appropriate.
In the past, some steam turbines in power plants and shipyards suffered serious deformation due to unreasonable structural design and improper selection of insulation materials, large temperature difference between the upper and lower cylinders, large temperature difference between the inner and outer walls of cylinders and the inner and outer walls of flanges in the operation of steam turbine units, and serious deformation of the units, which affected the safe operation of the units. In China, some power plants, shipyards and industrial steam turbines have been gradually replaced with new detachable insulation structures. The lower cylinder adopts fixed heat preservation structure.
Thermal insulation scheme for detachable thermal insulation sleeve of steam turbine in power plant;
1 > upper cylinder: detachable heat insulation sleeve + outer protective layer ( stainless steel plate or glass fiber reinforced plastic ), divided into sections and made in blocks.
The inner layer of the detachable heat insulation sleeve of the steam turbine - high temperature resistant ceramic fiber cloth ( capable of resisting 1260 deg c and being used for a long time at 1000 deg c ) or high silicon oxide cloth ( capable of resisting 1000 deg c and being used for a long time at 950 deg c );
Removable insulation sleeve insulation core layer: ceramic fiber blanket 240 mm;
External surface layer of detachable thermal insulation sleeve of steam turbine - silica gel cloth.
2 > lower cylinder: fixed insulation structure ( similar to boiler body insulation ), insulation thickness is 1.1 times of the upper cylinder.
3 > flange on the middle surface of the cylinder: detachable heat insulation sleeve + external protective layer ( stainless steel plate or glass fiber reinforced plastic ), divided into sections and made in blocks.
Different heat insulation material can be replaced accord to actual application conditions, so that that thickness and the size can be changed to meet the heat insulation installation of the tight space between the devices.

● Thermal insulation scheme of steam pipeline in power plant

Using detachable insulation structure, insulation layer thickness of 180 mm ( 90 mm x 2 layer ceramic fiber blanket ).
The inner layer of the thermal insulation sleeve of the steam pipeline of the power plant - medium alkali glass fiber cloth ( can resist 600 deg c and can be used for a long time at 450 deg c );
Thermal insulation core layer of thermal insulation sleeve of steam pipeline in power plant - ceramic fiber blanket 180 mm:
Thermal insulation jacket outer layer of power plant steam pipeline - silica gel cloth / glass fiber reflective cloth.
The thickness of that heat insulation inn core of the detachable heat insulation sleeve is correspondingly changed for three pipeline with different temperatures.
Advantage of steam turbine with detachable heat insulation sleeve
Low thermal conductivity, good heat preservation effect;
Low saving installation and maintenance construction time, greatly shorten the construction period, indirectly create profits;
● can be disassembled for multiple times, reused, energy-saving and environment - friendly;
Low flexible insulation, not afraid of stepping, not afraid of touch;
Low appearance layer oil waterproof, acid and alkali corrosion resistance.
Low choice of various ways, installation is convenient without bare;
Low product appearance beautiful clean and tidy, the surface can be scrubbed.
● service life up to 20 years.