Although kiln blocks igneous board and fire-wall to be controlled to the operation of kiln furnace in path kiln,have a lot of positive effect, but if be mixed in the amount,install locally unreasonable, also can go up to control bring negative effect, reason puts forward a few principles to offer reference.
1, the action that kiln path blocks igneous board and fire-wall
Kiln on the road the effect that blocks igneous board and fire-wall place to rise is main it is same. Block igneous board to be in charge of the control that to half kiln going up inside kiln, use commonly high temperature resistant beaverboard of horniness pottery and porcelain is made, can pass support in kiln exterior the on any account that adjusts the position. Fire-wall is in charge of the control that to half pit leaving inside kiln, use firebrick build by laying bricks or stones to build commonly, position of on any account is relatively fixed. Setting kiln path blocks igneous board and fire-wall to often be in same cross section locally.
Action of 1.1 fluctuation diversion
From hydromechanical motion principle knowable, because suffer the effect of action of geometrical pressure head, system of the steam inside kiln always has by next trends that move up, add in firing the difference that takes burner to be installed up and down, difference of rate of air current of level of passageway of the fluctuation inside kiln and temperature difference avoid hard, the fluctuation campaign that can use kiln path to block the space of igneous board and fire-wall to adjust air stream at this moment distributings, be in in order to balance good product firing the be heated effect in the process.
Action of 1.2 levels diversion
Kiln head gets inside kiln path advocate the action of fan, the gas that tall temperate zone, warm-up carries always is to kiln from horizontal way the head moves, right now, a sealed and current conduit is equivalent to inside kiln path. The gas that stands by kiln wall both sides suffers the effect of force of edge Cheng attrition, velocity of flow always sheds speed than the gas among low, especially warm-up belt, it is clear laminar flow position, affected the even be heated of product standard way thereby. At this moment, the horizontal movement that can block the appearance of igneous board and fire-wall to adjust air stream through kiln path distributings, be in in order to balance good product firing the be heated effect in the process.
1.3 adjust warm up curvilinear action
Of roller path kiln warm up the curve is very big degree depends on the product is firing the physico-chemical change that produces in the process, also mix with the norms size of the product firing and periodic about, basically consider base substrate namely to warming up the adaptability of speed. Kiln furnace asks to satisfy craft, use in tall temperate zone commonly adjust burner amount and fuel combustion quantity to control, kiln head is used in warm-up belt advocate fan smokes force to control, advocate fan smokes muscularity, warm-up takes temperature to lift.
When adjusting temperature curve, become via often can appearing kiln number one advocate fan smokes force to increase, temperature of tall temperate zone drops accordingly, the temperature whole that warm-up takes rises, smoke evacuation temperature also will rise, cannot realize temperature of designation a certain area to lift however. Make ceramic realizes the demand with the fast, slow temperature rise on craft hard so, those who affected whole is fast and firing. If be in,the setting before needing the position that temperature raises urgently blocks igneous board and fire-wall together, can achieve this one goal.
1.4 cut spread effect
Block igneous board and fire-wall as what install on the road in kiln, can remove cut to spread effect to air current motion directly. It is OK on certain level to take what what install to block igneous board and fire-wall to warm-up to kiln head advocate fan, smoking advocate wind canal, smoking raises what wind is in charge of to block igneous board to adjust have auxiliary effect, it is more important that igneous board and the section that fire-wall has are blocked to spread effect in what protect temperate zone and urgent cold area.
Below normal circumstance, heat preservation belt should be in Yu Wei to be being pressed or negative pressure condition, urgent cold belt should is in bigger controlling state, still have in heat preservation and urgent cold boundary a few motion of direction of head of kiln of gas flow direction is normal. But aborning, as a result of advocate when fan adjusts a balance with the fan that take heat, differ choose a site for the capital can achieve this kind of status, often give existing heat preservation to take gas to shed the trend that to urgent cold belt direction moves, at this moment, kiln path blocks igneous board and fire-wall to have crucial safeguard effect.
2, the setting that kiln path blocks igneous board and fire-wall
The effect that has according to its is distinct, kiln blocks igneous board and fire-wall setting means to should differ somewhat on the road, still should combine the circumstance such as pressure of characteristic of agglomeration of product type, recipe and kiln body norms, burner to consider integratedly, ability makes kiln path blocks igneous board and fire-wall to produce effect adequately, the setting that blocks igneous board and fire-wall includes appearance, amount, place, open the field such as degree of clearance.
The 2.1 appearance that block igneous board and fire-wall
Type of 2.1.1 one word is installed
Alleged one word type is to point to block igneous board and appearance of fire-wall end ministry to submit linear form, perpendicular install at rank of direction of kiln furnace length.
Way of this kind of setting is simpler, apply to cross section to accumulate lesser kiln furnace commonly, or firing the kiln furnace with slower rate, fluctuation can regard as diversion adjustment in warm-up belt, accumulation of heat regards as radiation in tall temperate zone or urgent cold before case hold back cut to spread effect.
2.1.2 toothed type are installed
Alleged and toothed type is to show kiln path blocks igneous board and appearance of fire-wall end ministry to submit concave and convex and toothed form, perpendicular install at rank of direction of kiln furnace length.
Type of 2.1.3 character 8 is installed
Type of alleged character 8 is direction of length of furnace of kiln pointing to an edge, fire-wall shows splay shape to arrange, those who carry ministry appearance to use toothed formula commonly is more. This kind of setting is relatively complex, and use on fire-wall only commonly, because if block igneous board,also use this kind of means, criterion its structure and operation can become very complex.
This kind of setting has stereo sex more, can adjust already fluctuation diversion action, OK also adjustment horizontal diversion action, and strengthened what air running water makes the same score direction to adjust ability. But insufficient place is fire-wall either sectional, blocking igneous board with path of on half kiln is not to be in completely sectional go up, air current should produce fluctuation rapid to move next, if adjust a purpose without this, can cause the mutual effect that next motion on air current distributing.
The 2.2 measures that block igneous board and fire-wall reach the place
2.2.1 amounts are installed
The setting that blocks igneous board and fire-wall caused the addition of obstruction of motion of the air current inside kiln path after all, if setting amount is overmuch, can cause kiln head to smoke force inadequacy directly, it is difficult that warm-up belt warms up, base substrate damp eliminates difficulty, make product occurrence black heart, base is cracked easily wait for blemish, perhaps can cause firing belt having pressinging big, flue gas flows backwards to cooling zone phenomenon. Path of general setting kiln blocks igneous board and fire-wall amount to be able to consider the following principles:
Length of 1) kiln furnace is long, setting amount should be some more, so that have many somes of medium,will adjust each paragraphs temperature position.
2) product is firing and periodic longer, the rate that enter pit is slower, the amount that sets at this moment is many somes OKer. Because cycle is long, the scale that the product accepts radiation to conduct heat than convection inside kiln will be some morer, what need kiln head to smoke a little bit force is relatively small, block igneous board and fire-wall setting measure many a little bit are helpful for stability of the temperature inside kiln.
Dosage of the clay in recipe of 3) base substrate is much, or base substrate full the depth a long time of big, organic matter, setting amount should be less. Increase the convection effect that warm-up takes below this kind of circumstance commonly, ability avoids product black heart, base to crack those who wait for blemish to appear.
4) smoke evacuation advocate fan shrinks force surplus big, setting amount can consider many a little bit. The room that only such ability assure to kiln furnace moves energy-saving force is bigger.
2.2.2 settings position
Kiln path blocks igneous board and fire-wall setting position to basically depend on the craft requirement of base substrate, consider the following positions commonly:
Urgent cold belt and heat preservation belt hand over 1) positional setting. The setting here is main spread effect to cut is being resisted since flue gas, the requirement blocks igneous board and fire-wall obligate space to want as far as possible small, surface of product of the distance that carry a department 10 ～ 12cm is advisable, use " appearance of " of one word type. Notable is here space control wants strict, can make product occurrence " waves otherwise horny " phenomenon. Because right now adobe height bate, get high temperature air stream extremely easy generation is out of shape after local concussion.
2) high temperature protects the setting before temperate zone. The setting basically is the stabilization since the temperature that takes to high temperature heat preservation, ensure curve of this paragraph of temperature is gently rise. The clearance that igneous board and fire-wall block here (be apart from product surface) ordinary control is in 15~25cm is advisable, if kiln body is wider, horizontal difference in temperature is big, can undertake compensating adjustment through blocking the appearance of igneous board, fire-wall.
3) is firing take other position setting. If kiln heat is high temperate zone is longer, firing and periodic longer also, can consider to install 2 ～ in tall temperate zone 3 gap are bigger block igneous board and fire-wall, the purpose is a stabilization of accumulation of heat, ministry of the ～ that carry ～ is controlled commonly to bricky face clearance in 20 ～ 30cm advisable.
4) warm-up takes 600 ～ 700 ℃ paragraph setting. In this phase, brilliant change already finished the quartz inside base substrate, the mechanical water, water between the layer eliminates more complete already, structural water, the many already eduction such as organic matter, warm up quickly safer. Accordingly, the action that here setting blocks igneous board, fire-wall and requirement and firing the setting truth before belt, heat preservation is taken is same.
5) warm-up takes other position to install. The setting that this position blocks igneous board and fire-wall is to adjust control level difference in temperature and fluctuation difference in temperature, according to the length that warm-up takes, can install 1 ～ commonly 2, clearance shoulds not be too small, 20 ～ 30cm is advisable, it is good that normally clearance of fire-wall of path of below half kiln compares path of on half kiln to block a little bit igneous board gap is big.
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