Boiler setting is pouring the desquamation of makings is one of main factors that bring about boiler accident to happen, to avoid to produce this kind of accident, we need to find boiler setting pouring makings desquamation reason, seek specific settlement method.
One, boiler setting is pouring expect desquamation reason substantially has two sides, it is craft of the construction that build furnace firstly unreasonable.
1, pouring makings when agitate " grey water is compared " control is undeserved.
In construction process, pouring expect when making up, grey water scale wants to be controlled strictly. If add water the quantity is overmuch, pouring expect porosity of interior of the material after shaping is tall, data strength is reduced greatly, especially when microtherm environment, lengthen of natural and caky time. The quantity that add water is too little, material fluidity is bad, vibration is not close-grained, leave stomatic, burrow easily to wait, pouring makings intensity also will be reduced greatly.
2, agitate time and pouring makings brace up beat time control is undeserved.
Pouring makings in pouring when should use brace up pound machine is statified undertake brace up pound. Agitate time is too short, material mixes inhomogenous; Oscillatory time is too long, material easy generation is statified, fine pink float is in the surface, aggregate is heavy in bottom, bring about data strength to reduce easy flake. Pouring expect to give out inside the 30min after blending, appropriate pouring the thickness that provides to place and height. Pouring makings construction should be in temperature of environment of 5 ° above undertakes ≥ , temperature is too low material is not easy and natural caky, or appear " the holiday coagulates " phenomenon. Pouring stuff is ordinary should undertake continuously pouring, advanced one pouring before coagulating at the beginning of makings, should below one pouring makings is pouring be over.
3, control of time of drawing of patterns is bad.
Pouring makings still cannot undertake drawing of patterns without sclerosis, should be in pouring when makings intensity can make sure its edges and corners is not damaged because of drawing of patterns, just can demolish. Bearing pattern plate: Should be in pouring makings achieve intensity 70% when square detachable model. It is facilitating drawing of patterns, pouring before all moulds are pouring the face all should besmear an engine oil.
4, pouring control of makings conserve time is undeserved.
Boiler build by laying bricks or stones is built finishing hind, should have enough nature dry period, so that make major water divides separate out in fireproof layer, a large number of moisture when avoiding drying-out cannot seasonable eduction brings about fireproof layer craze and fall off.
5, drying-out warms up speed and temperature gradient control are undeserved. Its are main the reason is construction personnel in subjective on the importance acknowledge to drying-out is less than.
2, boiler setting is pouring expect the 2nd desquamation reason, it is fireproof prevent grind structural design to be perfected not quite, or wear-resisting is fireproof and pouring problem of makings quality presence.
1, fireproof wear-resisting material expands seam a design unreasonable. As a result of annulus to, fore-and-aft expand seam design amount insufficient or other reason, bring about boiler wear-resisting the bulk after fireproof material be heated expands, squash each other, generation crackle.
2, the appearance that catch a hammer and need of the intensity that nail a leg are improved.
3, quality of fireproof wear-resisting material closes nevertheless or custodial not to be pooh-poohed.
We are in actual construction, in the light of above those who mention is a lot of fall off circumstance, can adopt measure of the following precaution appropriately:
1, be in fireproof and pouring makings choice respect, what should differ to use different property with the different position of boiler according to boiler is pouring makings. Management should be strengthened in construction, control material construction working procedure, craft and quality strictly, crucial working procedure undertakes whole process dogs supervise.
2, in pouring in makings right amount join steel fiber, improvement is fireproof defend the integral performance that wears a layer. Additional and right amount add cotton qualitative fiber, cotton qualitative fiber can be burned in drying-out process break, leave a lot of hole that are not be well versed in. The water vapour that these hole can make arise in drying-out process is successful eduction, prevent fireproof prevent grind a layer not to go out and arise because of hydrosphere crackle and fall off.
3, in boiler ceiling of easy cave in place, fetch of solder of use reinforcing steel bar does consolidate to handle, catch the tensile strength of the hammer in order to increase.
Such, we are in face boiler setting pouring the desquamation of makings problem, can get be settlemented effectively, can prolong the service life of kiln furnace already, the accident that also can prevent a lot of photographs to close happens.
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