CN105114136A - Heat insulation method and device for cylinder - Google Patents
Heat insulation method and device for cylinder Download PDFInfo
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- CN105114136A CN105114136A CN201510609193.5A CN201510609193A CN105114136A CN 105114136 A CN105114136 A CN 105114136A CN 201510609193 A CN201510609193 A CN 201510609193A CN 105114136 A CN105114136 A CN 105114136A
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Abstract
The invention relates to the field of turbines, and discloses a heat insulation method for a cylinder. The method includes the steps of performing heat insulation treatment on the exposed cylinder and arranging a heat insulation board on a front bearing pedestal corresponding to the cylinder. The process of performing heat insulation treatment on the exposed cylinder includes the steps that S11, a heat insulation layer is laid on the outer surface of the cylinder; S12, a metal wire net is laid on the outer surface of the heat insulation layer; S13, asbestos powder, cement powder and plastering powder are mixed and added with water to be stirred to form plastering slurry; S14, the plastering slurry is applied on the metal wire net and the heat insulation layer to form a first plastering layer; S15, after the moisture of the first plastering layer is reduced by 60%-80%, surface slurry is applied on the first plastering layer to form a second plastering layer. The invention further discloses a heat insulation device for the cylinder. According to the heat insulation method for the cylinder, heat insulation treatment is performed on the exposed cylinder at a front steam seal, so that heat is prevented from being emitted outwards; meanwhile, the baffle is installed at an oil catch of the front bearing pedestal, so that influences of heat radiation are further reduced.
Description
Technical field
The present invention relates to steam turbine field, particularly relate to a kind of heat insulation method for cylinder and device.
Background technique
Steam turbine be by the transformation of energy of steam be mechanical work rotary power machinery, after entering steam turbine from the steam of boiler, successively through nozzle and the movable vane of a series of loop configurations, being the mechanical energy that turbine rotor rotates by the thermal energy of steam, is most widely used prime mover in modern thermal power plant.Gap between rotor and quiet body can cause leaking vapour, and this not only can reduce unit efficiency, also can affect unit safety operation.In order to prevent steam leakage and air from bleeding, needing seal arrangement, being commonly referred to packing.
Before current steam turbine there is the phenomenon of temperature exceeding standard in sealing gland place, and according to in-site measurement, front steam seal place temperatures as high about 350 DEG C, ram's horn temperature reaches 170 DEG C, and front bearing box oil catch place temperature reaches 110 DEG C.Heat is reached front case by thermal-radiating mode by the high temperature at front steam seal place, there is potential threat to lubrication oil.Find through exploration, there is not the phenomenon of gas leakage in front steam seal place, the main cause of temperature drift is that front steam seal place cylinder is in an atmosphere exposed, and cylinder is by the outside distribute heat of thermal radiation.
In order to reduce the performance of thermal losses and guarantee lubricant oil, needing a kind of heat insulation method of research and development badly, preventing cylinder heat from outwards distributing.
Summary of the invention
For overcoming the deficiencies in the prior art, the object of the invention is: provide a kind of heat insulation method for cylinder and device, the cylinder exposed to front steam seal place carries out isothermal holding, prevents heat from outwards distributing, and utilizes baffle plate to reduce thermal radiation simultaneously.
In order to solve the technical problem in background technique, the invention provides a kind of heat insulation method for cylinder, comprise and isothermal holding is carried out to exposed cylinder, and thermal baffle is set at the front-end bearing pedestal place corresponding with cylinder, wherein, describedly isothermal holding carried out to exposed cylinder comprise the following steps:
S11, lay thermal insulation layer at cylinder outer surface;
S12, thermal insulation layer outer surface lay wire gaze;
S13, by asbestos powder, cement flour and powder of wiping one's face mixing, and add water and stir into slurry of wiping one's face;
S14, slurry of wiping one's face are applied on wire gaze and thermal insulation layer, form the first float coat;
S15, to remove after 60%-80% until the humidity of the first float coat, the first float coat smears starch adhesive, forms the second float coat.
Describedly thermal baffle be set at the front-end bearing pedestal place corresponding with cylinder comprise the following steps:
S21, between two stainless steel strips, fill the thermal baffle that alumina silicate needle punched blanket makes sandwich tabular;
S22, make two semicircles by bending for thermal baffle;
S23, the thermal baffle of two semicircles is located at described front-end bearing pedestal outer, and by bolt mode, the thermal baffle of two semicircles is fixedly connected with circular.
In described step S13, the weight ratio of asbestos powder, cement flour and powder of wiping one's face is 1.2:1.5:2.5; The speed of drying that the first float coat accelerated by blower fan is opened in described step S15.
Thermal insulation layer in described step S11 is the shaping alumina silicate needle punched blanket of long fibre acupuncture, the step of laying of thermal insulation layer is at the front steam seal place corresponding with cylinder welding hook nail, described thermal insulation layer is hooked in described hook nail place, realizes thermal insulation layer to be fixedly attached at cylinder outer surface.
Present invention also offers a kind of heat-proof device for cylinder, comprise insulation cover and thermal baffle, described insulation cover is fixedly laid in the outer surface of cylinder, described insulation cover comprises thermal insulation layer and float coat, described thermal insulation layer is located at the inner side of insulation cover, described float coat is located at the side of described thermal insulation layer away from cylinder, described float coat is multi-layer structure, every one deck is equipped with wire gaze and asbestos cement is wiped one's face, described thermal baffle is sandwich board three-decker, described thermal baffle is located at the front-end bearing pedestal corresponding with described cylinder or front-end bearing pedestal oil shelves outer ring place, the sandwich mesosphere of described thermal baffle is the shaping heat insulating refractory material layer of long fibre acupuncture.
Preferably, the thermal insulation layer of described insulation cover is the shaping alumina silicate needle punched blanket of long fibre acupuncture, described heat insulating refractory material layer is alumina silicate needle punched blanket, the skin of described thermal baffle is the first stainless steel strip and the second stainless steel strip, described first stainless steel strip is located at the outside of heat insulating refractory material layer, and described second stainless steel strip is located at the inner side of heat insulating refractory material layer.
Preferably, described thermal baffle is divided into two semicircles, and two semicircle thermal baffles connect into the thermal baffle of circle shape by bolt or screw mode.
Preferably, described float coat is double layer construction, described float coat comprises the first float coat and the second float coat, described first float coat and described thermal insulation layer are fitted, described second float coat and the first float coat are fitted, described second float coat surfacing is round and smooth, and the planeness of described second float coat is not more than 3mm/m.
Preferably, described insulation cover is also located at the front steam seal place corresponding with cylinder, the insulation cover thickness being located at described front steam seal place is identical with the insulation cover thickness outside cylinder, and described insulation cover is fixedly laid in the outer surface of described cylinder by the hook nail that described front steam seal place welds.
Preferably, the height of described thermal baffle is higher than the upper end cap height of described front-end bearing pedestal.
Adopt technique scheme, the cylinder exposed to front steam seal place for the heat-proof device of cylinder of the present invention carries out isothermal holding, prevents heat from outwards distributing, and installs baffle plate at front-end bearing pedestal oil catch place simultaneously, reduces thermal-radiating impact further.
Accompanying drawing explanation
In order to be illustrated more clearly in technological scheme of the present invention, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic cross-section of the insulation cover of the heat-proof device for cylinder that the embodiment of the present invention provides;
Fig. 2 is the schematic cross-section of the thermal baffle of the heat-proof device for cylinder that the embodiment of the present invention provides.
Wherein, in figure, reference character corresponds to: 1-thermal baffle, 11-first stainless steel strip, 12-second stainless steel strip, 13-heat insulating refractory material layer, 2-insulation cover, 21-thermal insulation layer, 22-first float coat, 23-second float coat.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, belongs to the scope of protection of the invention.
Embodiment 1: Fig. 1 is the schematic cross-section of the insulation cover of the heat-proof device for cylinder that the embodiment of the present invention provides, Fig. 2 is the schematic cross-section of the thermal baffle of the heat-proof device for cylinder that the embodiment of the present invention provides, can clearly be seen that from figure, the heat-proof device for cylinder that the present embodiment provides comprises insulation cover 2 and thermal baffle 1, described insulation cover 2 is fixedly laid in the outer surface of cylinder, described insulation cover 2 comprises thermal insulation layer 21 and float coat, described thermal insulation layer 21 is located at the inner side of insulation cover 2, preferably, the thermal insulation layer 21 of described insulation cover 2 is the shaping alumina silicate needle punched blanket of long fibre acupuncture, after cylinder lays thermal insulation layer, the upper cover of the bearing support corresponding with cylinder is not hindered to dismantle.Described float coat is located at the side of described thermal insulation layer 21 away from cylinder, described float coat is double layer construction, described float coat comprises the first float coat 22 and the second float coat 23, described first float coat 22 is fitted with described thermal insulation layer 21, described second float coat 23 and the first float coat 22 are fitted, every one deck is equipped with wire gaze and asbestos cement is wiped one's face, described thermal baffle 1 is sandwich board three-decker and bends to two semicircle shapes, two semicircle thermal baffles connect into the thermal baffle 1 of circle shape by bolt or screw mode, described thermal baffle 1 is located at the front-end bearing pedestal outer ring place corresponding with described cylinder, preferably, for alleviating thermal radiation, the height of described thermal baffle 1 is higher than the upper end cap height of described front-end bearing pedestal, particularly, described heat insulating refractory material layer 13 is alumina silicate needle punched blanket, the skin of described thermal baffle 1 is the first stainless steel strip 11 and the second stainless steel strip 12, described first stainless steel strip 11 is located at the outside of heat insulating refractory material layer 13, described second stainless steel strip 12 is located at the inner side of heat insulating refractory material layer 13.
Particularly, described float coat should divide two layers of construction to carry out, first float coat 22 is back-up coat wire gaze and asbestos cement float coat, after the first float coat is slightly dry, namely the humidity removal of the first float coat reaches 60% and can be considered that the first float coat is slightly dry, the second float coat 23 carrying out the second layer is again constructed, described second float coat 23 is similarly back-up coat wire gaze and asbestos cement float coat, the necessary levelling extruding of described first float coat 22 is tight smooth, and described second float coat 23 requires that press polish compacting flattens.Described second float coat 23 surfacing is smooth, and corner angle are neat, and arc-shaped transition is round and smooth, and the planeness of described second float coat 23 is not more than 3mm/m.Note be, when constructing at the scene, workman need carry out labor protection, prevents from scalding.
Described insulation cover 2 is also located at the front steam seal place corresponding with cylinder, namely front steam seal body is incubated together with cylinder, prevent heat to external diffusion further, carry out the preventive measure preventing foreign matter from entering gap between cylinder and front steam seal body, insulation cover 2 thickness being located at described front steam seal place is identical with insulation cover 2 thickness outside cylinder simultaneously.Described insulation cover 2 is fixedly attached at the outer surface of described cylinder by the hook nail that described front steam seal place welds, and specific implementation is, insulation cover is hooked in described hook nail place.
The present invention also provides a kind of heat insulation method for cylinder, comprises and carries out isothermal holding to exposed cylinder, and arranges thermal baffle at the front-end bearing pedestal place corresponding with cylinder, wherein, describedly carries out isothermal holding to exposed cylinder and comprises the following steps:
S11, lay thermal insulation layer at cylinder outer surface;
S12, thermal insulation layer outer surface lay wire gaze;
S13, by asbestos powder, cement flour and powder of wiping one's face mixing, and add water and stir into slurry of wiping one's face;
S14, slurry of wiping one's face are applied on wire gaze and thermal insulation layer, form the first float coat;
S15, to remove after 60%-80% until the humidity of the first float coat, the first float coat smears starch adhesive, forms the second float coat.
Describedly thermal baffle be set at the front-end bearing pedestal place corresponding with cylinder comprise the following steps:
S21, between two stainless steel strips, fill the thermal baffle that alumina silicate needle punched blanket makes sandwich tabular;
S22, make two semicircles by bending for thermal baffle;
S23, the thermal baffle of two semicircles is located at described front-end bearing pedestal outer, and by bolt mode, the thermal baffle of two semicircles is fixedly connected with circular.
Preferably, in described step S13, the weight ratio of asbestos powder, cement flour and powder of wiping one's face is 1.2:1.5:2.5; The speed of drying that the first float coat accelerated by blower fan is opened in described step S15.
Thermal insulation layer in described step S11 is the shaping alumina silicate needle punched blanket of long fibre acupuncture, the step of laying of thermal insulation layer is at the front steam seal place corresponding with cylinder welding hook nail, described thermal insulation layer is hooked in described hook nail place, realizes thermal insulation layer to be fixedly attached at cylinder outer surface.
Embodiment 2: Fig. 1 is the schematic cross-section of the insulation cover of the heat-proof device for cylinder that the embodiment of the present invention provides, Fig. 2 is the schematic cross-section of the thermal baffle of the heat-proof device for cylinder that the embodiment of the present invention provides, can clearly be seen that from figure, the heat-proof device for cylinder that the present embodiment provides comprises insulation cover 2 and thermal baffle 1, described insulation cover 2 is fixedly laid in the outer surface of cylinder, described insulation cover 2 comprises thermal insulation layer 21 and float coat, described thermal insulation layer 21 is located at the inner side of insulation cover 2, preferably, the thermal insulation layer 21 of described insulation cover 2 is the shaping alumina silicate needle punched blanket of long fibre acupuncture, after cylinder lays thermal insulation layer, the upper cover of the bearing support corresponding with cylinder is not hindered to dismantle.Described float coat is located at the side of described thermal insulation layer 21 away from cylinder, described float coat is three-decker, every one deck of described float coat is equipped with wire gaze and asbestos cement is wiped one's face, described thermal baffle 1 is sandwich board three-decker and bends to circle shape, described thermal baffle 1 is located at the front-end bearing pedestal oil shelves outer ring place corresponding with described cylinder, preferably, for alleviating thermal radiation, the height of described thermal baffle 1 is higher than the upper end cap height of described front-end bearing pedestal, particularly, described heat insulating refractory material layer 13 is alumina silicate needle punched blanket, the skin of described thermal baffle 1 is the first stainless steel strip 11 and the second stainless steel strip 12, described first stainless steel strip 11 is located at the outside of heat insulating refractory material layer 13, described second stainless steel strip 12 is located at the inner side of heat insulating refractory material layer 13.
Particularly, described float coat should divide tri-level construction to carry out, after first layer is slightly dry, namely the humidity removal of the first float coat reaches 80% and can be considered that the first float coat is slightly dry, carry out second layer construction again, carry out third layer again after the second layer is slightly dry, namely the humidity removal of the second float coat reaches 80% and can be considered that the second float coat is slightly dry, the necessary levelling extruding of first layer is tight smooth, and third layer requires that press polish compacting flattens.Require that uppermost third layer surfacing is smooth, corner angle are neat, and arc-shaped transition is round and smooth, and planeness is not more than 3mm/m.Note be, when constructing at the scene, workman need carry out labor protection, prevents from scalding.
Described insulation cover 2 is also located at the front steam seal place corresponding with cylinder, namely front steam seal body is incubated together with cylinder, prevent heat to external diffusion further, carry out the preventive measure preventing foreign matter from entering gap between cylinder and front steam seal body, insulation cover 2 thickness being located at described front steam seal place is identical with insulation cover 2 thickness outside cylinder simultaneously.Described insulation cover 2 is fixedly attached at the outer surface of described cylinder by the hook nail that described front steam seal place welds, and specific implementation is, insulation cover is hooked in described hook nail place.
The cylinder exposed to front steam seal place for the heat-proof device of cylinder of the present invention carries out isothermal holding, prevents heat from outwards distributing, and installs baffle plate at front-end bearing pedestal oil catch place simultaneously, reduces thermal-radiating impact further.
Above disclosedly be only several preferred embodiment of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. for a heat insulation method for cylinder, it is characterized in that, comprise and isothermal holding is carried out to exposed cylinder, and thermal baffle is set at the front-end bearing pedestal place corresponding with cylinder, wherein, describedly isothermal holding is carried out to exposed cylinder comprise the following steps:
S11, lay thermal insulation layer at cylinder outer surface;
S12, thermal insulation layer outer surface lay wire gaze;
S13, by asbestos powder, cement flour and powder of wiping one's face mixing, and add water and stir into slurry of wiping one's face;
S14, slurry of wiping one's face are applied on wire gaze and thermal insulation layer, form the first float coat;
S15, to remove after 60%-80% until the humidity of the first float coat, the first float coat smears starch adhesive, forms the second float coat.
2. as claimed in claim 1 for the heat insulation method of cylinder, it is characterized in that, describedly thermal baffle is set at the front-end bearing pedestal place corresponding with cylinder comprises the following steps:
S21, between two stainless steel strips, fill the thermal baffle that alumina silicate needle punched blanket makes sandwich tabular;
S22, make two semicircles by bending for thermal baffle;
S23, the thermal baffle of two semicircles is located at described front-end bearing pedestal outer, and by bolt mode, the thermal baffle of two semicircles is fixedly connected with circular.
3., as claimed in claim 1 for the heat insulation method of cylinder, it is characterized in that, in described step S13, the weight ratio of asbestos powder, cement flour and powder of wiping one's face is 1.2:1.5:2.5; The speed of drying that the first float coat accelerated by blower fan is opened in described step S15.
4. as the heat insulation method for cylinder in claim 1-3 as described in any one, it is characterized in that, thermal insulation layer in described step S11 is the shaping alumina silicate needle punched blanket of long fibre acupuncture, the step of laying of thermal insulation layer is at the front steam seal place corresponding with cylinder welding hook nail, described thermal insulation layer is hooked in described hook nail place, realizes thermal insulation layer to be fixedly attached at cylinder outer surface.
5. the heat-proof device for cylinder, it is characterized in that, comprise insulation cover (2) and thermal baffle (1), described insulation cover (2) is fixedly laid in the outer surface of cylinder, described insulation cover (2) comprises thermal insulation layer (21) and float coat, described thermal insulation layer (21) is located at the inner side of insulation cover (2), described float coat is located at the side of described thermal insulation layer (21) away from cylinder, described float coat is multi-layer structure, every one deck is equipped with wire gaze, asbestos, cement and powder of wiping one's face, described thermal baffle (1) is sandwich board three-decker, described thermal baffle (1) is located at the front-end bearing pedestal corresponding with described cylinder or front-end bearing pedestal oil shelves outer ring place, the sandwich mesosphere of described thermal baffle (1) is the shaping heat insulating refractory material layer (13) of long fibre acupuncture.
6. as claimed in claim 5 for the heat-proof device of cylinder, it is characterized in that, the thermal insulation layer (21) of described insulation cover (2) is the shaping alumina silicate needle punched blanket of long fibre acupuncture, described heat insulating refractory material layer (13) is alumina silicate needle punched blanket, the skin of described thermal baffle (1) is the first stainless steel strip (11) and the second stainless steel strip (12), described first stainless steel strip (11) is located at the outside of heat insulating refractory material layer (13), and described second stainless steel strip (12) is located at the inner side of heat insulating refractory material layer (13).
7., as claimed in claim 6 for the heat-proof device of cylinder, it is characterized in that, described thermal baffle (1) is divided into two semicircles, and two semicircle thermal baffles connect into the thermal baffle (1) of circle shape by bolt or screw mode.
8. as claimed in claim 5 for the heat-proof device of cylinder, it is characterized in that, described float coat is double layer construction, described float coat comprises the first float coat (22) and the second float coat (23), described first float coat (22) and described thermal insulation layer (21) are fitted, described second float coat (23) and the first float coat (22) are fitted, the surfacing of described second float coat (23) is round and smooth, and the planeness of described second float coat (23) is not more than 3mm/m.
9. as claimed in claim 5 for the heat-proof device of cylinder, it is characterized in that, described insulation cover (2) is also located at the front steam seal place corresponding with cylinder, insulation cover (2) thickness being located at described front steam seal place is identical with insulation cover (2) thickness outside cylinder, and described insulation cover (2) is fixedly laid in the outer surface of described cylinder by the hook nail that described front steam seal place welds.
10. as the heat-proof device for cylinder in claim 5-9 as described in any one, it is characterized in that, the height of described thermal baffle (1) is higher than the upper end cap height of described front-end bearing pedestal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510609193.5A CN105114136B (en) | 2015-09-22 | 2015-09-22 | A kind of heat-insulating method for cylinder and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510609193.5A CN105114136B (en) | 2015-09-22 | 2015-09-22 | A kind of heat-insulating method for cylinder and device |
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| CN105114136A true CN105114136A (en) | 2015-12-02 |
| CN105114136B CN105114136B (en) | 2016-08-17 |
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Cited By (1)
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| CN107676137A (en) * | 2017-10-20 | 2018-02-09 | 江西大唐国际抚州发电有限责任公司 | A kind of steam turbine cylinder for being covered with insulation material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107676137A (en) * | 2017-10-20 | 2018-02-09 | 江西大唐国际抚州发电有限责任公司 | A kind of steam turbine cylinder for being covered with insulation material |
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| CN105114136B (en) | 2016-08-17 |
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