Boiler of circular fluid-bed boiler, rubbish incinerator, large power plant moves in, the chamber of a stove or furnace and surface of liner of stock circulatory system bear for a long time charging of solid of high concentration loop erodes, can raise strict requirement to fireproof endurance. The stoving process of material of fireproof wear-resisting liner matters to new construction directly the construction quality of liner material and function, the burns firewood and coal drying-out method that shows a tradition has satisfied boiler drying-out requirement hard. Our company a kind of new-style drying-out craft, choose dryer to undertake do not have blaze drying-out law as fuel with oil. Practice confirms law of the drying-out that do not have blaze can ensure drying-out quality.
1, drying-out mechanism
There is the liner that much place makes by fireproof wear-resisting material in CFB boiler, use fireproof wear-resisting to pound dozen of makings and wear-resisting in great quantities pouring makings. These liner put the wet branch that has the different pattern such as free water, crystallization water in what the spot avoids. Warm up in be heated in the process, if moisture evaporates quickly, the steam pressure of generation exceeds concrete to may make boiler setting blowout damages, the hard to avoid in causing boiler setting of; of collapse of large area boiler setting and liner possibly even has stress to center, if expand plus initiative heat not divide evenly, also can be damaged as a result of thermal stress. Accordingly, the dry drying-out of liner material is moving dependability of the life that the boiler after new construction or overhaul starts the general drying-out quality before moving to affect fireproof wear-resisting liner directly and boiler.
Generally speaking, the goal that drying-out should achieve is:
(1) damage to avoid to moisture evaporates quickly and bring about boiler setting, make the moisture inside fireproof wear-resisting material slow evaporate separate out, and get sufficient dry.
(2) dry hind, it is certain to continue to heat temperature, make data of fireproof wear-resisting liner sufficient solidify, maintain the high temperature intensity of fireproof wear-resisting layer and stability, every intensity.
(3) make fireproof wear-resisting layer slow, sufficient and expand equably, because thermal stress concentration or change of crystal lattice of fireproof wear-resisting material cause attaint of fireproof wear-resisting layer to wait,avoid fireproof wear-resisting layer.
Anyhow, the dry in hand of fireproof wear-resisting liner is slow heat with even ground sufficient the crucial place that assures drying-out quality.
2, the characteristic of the drying-out that do not have blaze
Consult foreign boiler drying-out concerns a material, put forward not to have blaze drying-out new technology, its should nod as follows:
(1) serve as heat source in order to heat up flue gas without blaze drying-out, make liner material is obtained heat adagio process, abide by water of material of fireproof wear-resisting liner strictly to assign slow and even rate, control dry temperature and temperature rise rate, make the successful separate out of different pattern moisture content.
(2) the drying-out that do not have blaze uses drying-out machine to produce hot flue gas outside furnace, will hot flue gas knows the place that wants stoving, comb-out reachs his to enter with the segregator of makings system implement with standpipe, inclined leg and cold broken bits implement wait for place to accept structural condition restriction, the ” of drying-out “ blind angle that forms in traditional drying-out method.
(3) drying-out plane fuel is given priority to with light oil, also can burn aeriform fuel or heavy oil, combustion is stable, temperature of hot flue gas can be inside 200~450 ℃ limits the requirement of temperature of adjusting control sufficient drying-out and temperature rise rate.
4, drying-out plan is carried out
(1) the chamber of a stove or furnace: In 9m locomotive layer arranges 4 drying-out machine, around wall each 2, drying-out hot flue gas connects kiln of the chamber of a stove or furnace chamber bottom is fireproof wear-resisting material.
Wind makings leg: In 9m locomotive layer arranges 2 drying-out machine, pass special flue, via flue gas heating up drying-out to introduce respectively inside the chamber of a stove or furnace two wind makings leg, reentrance cent is the same as glassware, 2 arrange 2 drying-out machine each with glassware, connect hot flue gas by manhole door, enter segregator via answering glassware.
Segregator enters the mouth: The flue that exports segregator in the chamber of a stove or furnace arranges machine of a drying-out, drying-out heats up flue gas to enter two segregator via manhole door respectively by 3 flue.
Segregator exit: Machine of a drying-out is arranged to the horizontal flue of caudal shaft in segregator exit, drying-out heats up flue gas to enter export level flue via manhole door respectively by 3 flue.
Cold broken bits implement: In 2 cold broken bits implement each accept plane of a drying-out (can add drying-out machine to undertake according to drying-out circumstance) .
Press afore-mentioned decorating, the direct drying that all can get drying-out machine heat up flue gas partly in the fireproof wear-resisting material of whole platform boiler, without any blind angle areas.
(2) partition and flue gas exit
Heat to make hot flue gas can be centered material of each place liner, flue gas all the flow of from bottom to top, contain in exit of the chamber of a stove or furnace partition, partition all around the flue gas of put apart the chamber of a stove or furnace enters segregator entrance; In segregator exit is in to caudal flue also mount partition, prevent drying-out flue gas to enter do not need roast caudal flue, the starting a hole that put apart 1m2 controls, furnish takes fender temporarily chimney, regard the eduction of drying-out flue gas as the mouth.
(3) temperature monitoring point is chosen
In process of drying-out of hot flue gas, the hot laziness of fireproof wear-resisting liner is very big, accurate determine temperature change is relatively difficult; And the value of test of inspect of flue gas temperature of corresponding place may have constant wave motion, but the temperature change rate of liner always is lag and gentlier, the average that takes specific flue gas to measure bit of temperature is made detect quite liner temperature is more reliable.
In boiler drying-out process, measure tepid couple to choose boiler to go up already some measures lukewarm place, ask the hot node of thermocouple extends boiler setting. Specific choose measure lukewarm the chamber of a stove or furnace bottom and mid the each 4 thermocouple, average that takes 8 to measure a place comes temperature of drying-out of token the chamber of a stove or furnace.
With glassware upper part each at 1 o'clock, segregator imports flue each at 2 o'clock, export each at 2 o'clock, regard segregator drying-out temperature as referenced value; 5 when take each segregator drying-out temperature that measure each bit of segregator control a cost.
Cold broken bits implement take every cold broken bits implement the average that 3 temperature that go up measure a place serves as cold broken bits implement drying-out controls temperature. Fireproof wear-resisting material is in dry process, go on a journey of the analyse when 80~200 ℃ leaves water, in water of crystallization of the separate out when 200~330 ℃ , when temperature of fireproof wear-resisting liner is high, internal composition solidify, achieve the performance of fireproof wear-resisting material stage by stage, because density of fireproof wear-resisting material is big, liner has the ply that comparative, moisture spills over, it is very difficult to make its bulk reachs steady state, dry process is the important segment of drying-out. According to drying-out requirement and economic technology are compared, drying-out measure: What front row pace is liner material is dry, namely microtherm drying-out; The 2nd pace is the agglomeration of liner material, namely high temperature drying-out. The drying-out that do not have blaze basically is completely dry, high temperature drying-out is in boiler the first time oily burner is started to finish when joining movement.
3. is carried out without blaze drying-out lukewarm accuse a curve
Microtherm drying-out basically achieves 3 goals:
(1) make wet boiler setting is in 80-110 ℃ is slow, even eduction dissociate water;
(2) make wet boiler setting is in 250-330 ℃ is slow, even eduction crystallization water;
(3) construction stress is eliminated in 300 ℃ above, enhance solidify strength.
For this, make microtherm carbonado furnace temperature accuses a curve.
Drying-out machine adjusts convenient, control of temperature of taking one with another is smooth, but in be being carried out actually as a result of a variety of interference, temperature of the flue gas inside furnace still has constant wave motion, allow error of flue gas temperature to be in commonly ±25 ℃ . Kerosene burner, rate of temperature rise of high temperature drying-out is OK some faster, but still need to control, and still want constant temperature for some time in dot of a few temperature.
4, drying-out quality inspection
Be in business to use imitate test block surely, inside furnace each drying-out place places the test block with structure and this same position; Drying-out ends the leftover moisture that checks imitate test block to be drying-out qualification namely. Actual drying-out effect is divided in for test block flood 0.8% the following.
After be in charge of high temperature drying-out through combining boiler to rush, check again, boiler setting liner does not have any unusual evidence; Finished try to carry and be checked and accept after joining movement, check again, boiler setting does not have any unusual evidence.
Practice makes clear, the quality of drying-out is good, boiler drying-out is divided into 2 measure feasible, especially front row phase uses method of the drying-out that do not have blaze is a success.
5, the comparison of law of the drying-out that do not have blaze and traditional drying-out law
Add the oil that start to light with firewood of congener CFB boiler implement drying-out photograph is compared, law of the drying-out that do not have blaze showed huge advantage, without drying-out blind angle, drying-out of general 7.5-8 day finishs a furnace.
Improve drying-out effect and result of fireproof material quality.
Flourish Cheng Naicai basically produces tall aluminous brick, silica brick, argillaceous brick, magnesian Luo brick, heat-insulating material, fireproof slop, pouring a series of high quality products such as makings, flourish fills a company to take consistent management concept, pursue " sincere letter, respectful modest, innovation, respect property " tenet, " cheap of qualitative actor price " the cornerstone that develops as the enterprise, will found " Rong Cheng character " as company strategy goal. Govern system, rich product type with scientific administrative technological process, perfect client information, the user that is us provides satisfactory, seasonable, efficient service.
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