Use CL-80 pouring because limitation of chimney construction technology and investment control a demand,expecting is, cannot cooperate to undertake construction of chimney slippery model well, construction time limit for a project long, investment is higher; 2 as a result of,be climate and project characteristic, the returning that existence solves hard is alkaline flake problem. So, use CL-80 pouring although makings has case of chimney construction success, but specific to this project it is unsuited however. And although CL-80 is inferior to on structural design,use acid-proof brick pouring makings economy, but its are in this project chimney construction technology is feasible, satisfy requirement of construction time limit for a project at the same time, saved total investment, so this project chooses to use acid-proof brick to regard chimney as liner eventually.
This shows, the choice of chimney liner, the influence of chimney execution condition is quite important.
1. project general situation
Oily boiler of some tall sulfur anxious generation transforms the ferroconcrete chimney of the project, d=5m of internal diameter of able to read aloud fluently of tall H=150m, chimney, d=22m of fundamental bottom external diameter. According to tall sulfur boiler of anxious acting oil transforms project total decency to prepare plan to plan, project of this chimney construction plans to be 120 calendar day (on January 18 - on May 18, include construction to plan time, but do not include - the) of construction time limit for a project of 0 the following foundations, among them time of construction of chimney cylindrical shell is 60 calendar day (the) end April comes by Feburary.
2. liner type selecting
Chimney of traditional this kinds of project often uses acid-proof brick to serve as liner, this project plans to use a kind of new-style CL-80 pouring expect liner. CL-80 is pouring the characteristic of makings is unit weight small (the 1/3) that is acid-proof brick, concrete of chimney canister wall can be reduced on certain level quantity and coefficient of thermal conductivity of; of quantity of fundamental reinforcing steel bar are low (pouring makings for 0112W/mk, acid-proof brick is 019W/mk) , need not add thermal insulation. Overall and character, acid-proof brick economy is compared on the design, and pouring makings and concrete function likeness, be united in wedlock through burying reinforcing steel bar and concrete beforehand, it is better that whole gets power performance.
The contradiction of 3. liner type selecting and execution condition
From the design angle CL-80 is pouring makings comparing is acid-proof brick more economy is sound, but when concrete union the programme of construction discusses, discovery uses CL-80 pouring makings have the following issue of two big fields:
Time limit for a project of 1) construction technology, construction and liner design mediate hard, because construction time limit for a project asks to tighten, construction of chimney cylindrical shell from Feburary the bottom begins, the bottom ended in April, build for periphery build content construction to vacate; of area of safe construction work to add CL-80 pouring material data physics, chemical function and concrete likeness, irrigate aptly build, construction unit is preliminary chose plan of double slippery standard, the canister outside can be being striven for so and liner are almost synchronous construction, spare time. But construction of double slippery standard is as pouring as CL-80 on the technology the contradiction that the detail design existence of makings cannot mediate, basically have: A. Synchronous between liner of requirement of double slippery standard and canister wall at least due 5cm left and right sides is interstitial (normally use thermal insulation serves as space, see graph 2) , so that install disjunctive material, avoid concrete and pouring the each other ooze of makings. And CL-80 is pouring thermal insulation is not set between makings liner and chimney canister wall, pouring expect through the canister the wall buries reinforcing steel bar and concrete union beforehand, two kinds of material are contacted directly (graph 1) , although whole gets power performance better, bring about however cannot realize synchronism double slippery standard. B. If do not undertake synchronism double slip, and use canister wall and liner to stagger 015m slips modular plan. Because beautiful of concrete canister wall slips,rise an opportunity to be left and right sides of concrete strength 015MPa, slump to be controlled in 5~6cm, according to condition of local spring climate, predict to slip rise speed to be average everyday 215m left and right sides, namely 1m/8~9h. And CL-80 is pouring expect in 24h rear but drawing of patterns, it is at the same time avoid with ooze of concrete each other, the ability after particular strength is achieved in concrete but construction is same of elevation position pouring makings, so both cooperate hard on construction time, canister wall irrigates the beard after building a paragraph to await CL-80 drawing of patterns, time limit for a project will lengthen 3 times, do not suit the time limit for a project of this project to ask. C. In plan of double slippery standard unworkable circumstance falls, whether can adopt plan of single slippery standard, discuss discovery further, single slippery standard uses CL-80 pouring makings still put in a variety of problems.
Only slippery program namely first construction is over canister wall, after having side of enough construction work, undertake the construction of liner again. If use liner of the construction that raise a standard, put inside pattern plate system is complex, prop up, the problem such as exercise difficulty. Through further market research, discover this is planted pouring those who expect in the Yangtse River the construction case with north has a lot of to use is spray or daub plan. Is this kind of plan: ? Take along sth to sb of majestic of of ぃ of ┕ of reason of Mao of Qian of Xiao of Ran elder brother does not have Ling of kang of pedal Bin this ね knock ā Yu of Tan Yan of 6 miscellaneous Zi bud of take along sth to sb of of stalk of Dong type Mao this of ね knock ǔ slaughters Tao lamp to teach ㄓ divide evenly of of Guo of favour Po cough; Does pedal Bin chop Mou Mu of Shan of Jiao of of of of stay of proceedings of of Guo of food of serve of orangutan bright Xin is Huan of Meng Xi of of of В of fine fish hawk still small?
Use two kinds of afore-mentioned methods rarely in the top structure such as chimney consequently.
2) is pouring makings physics function and chemical composition and concrete close, concrete returns alkaline problem to be in in what happen below specific requirement pouring exist as much on makings.
Moisture of local spring, summer is burning hot, during this case chimney construction, there still was weather of a paragraph of get damp in March, as dry as north climate is very different, at the appointed time indoor because air is not current, damp gathers, air humidity is achieved 95% the left and right sides, often can condense in 4 walls lunt, form water.
After construction of alkalescent housing materials indoors the part because air humidity is big, water portion cannot seasonable eduction, if expose,be in air, can produce a series of chemical reaction (be like inside wall cement mortar wipes a face to often happen below such conditions return alkaline phenomenon) . And because airiness, lunt won't gather,expose the percentage outdoor, happen rarely instead return alkaline. As a result of pouring the physico-chemical property of makings and cement close, so probable also meeting happens return alkaline problem.
Return alkaline phenomenon incorporate to be: ? Honest a bit mace is of banter of τ of Gua of て of Gui of of street of lament Ran like that of Hui of of the Huaihe River of deceive of て of of mulberry of Pa of な of An of Guo of Biao of rice huller of of approach of of fat Cheng Qiong from small cup of of You Rui of ゼ of a mythical bird like the phoenix of a screen-like mountain peak Gu Lun poisoneds wine Chou , among them a few alkali metal and alkaline-earth metal material treat water will gradually translate into hydrate, should irrigate the water in building system enough a long time, in Mao Xi pressing action falls, water can rise along wool stoma amount to 10cm left and right sides, these hydrate also as irrigate the free water in building system gradually migratory to irrigate the surface that build system, after arriving at the surface, produce chemical reaction to generate carbonate generation to expand with air contact, cause irrigate the Pi Shusong since the surface that build system to fall off. It is with concrete exemple, does main chemistry react equation is: ? Does frequency of ㄒ of Kai of shelfing wholesale irrigate of palm of oxime of of Gui of rice huller of street Ba oh Zi of prostitute of grandma of of call on of Yi of locust of ド Buddhist templeput on the brakes?
Ca(OH)2+CO2=CaCO3+H2O
And CL-80 is together pouring makings, with cement physics, chemistry be close, irrigate the moisture content when building tall, fluidity is great, pouring hind enclothe concrete cylindrical shell, expose directly in the air inside the canister, chimney builds thing to tower, in-house air is not current, get damp season is very incidental return alkaline. Manufacturer discovers likewise in practice, fireproof and pouring makings is pouring after finishing, fall in climate of southern damp and hot cannot occurrence surface of seasonable and roast meeting is returned alkaline, if be handled not in time, can be deepened gradually and generation chases a layer to flake phenomenon, and in-house and progressively crisp medicinal powder. Pouring makings return alkaline phenomenon and reason and cement to irrigate building system is consistent, the key depends on the existence of free water, should solve this problem seasonable free water eduction, water translate into is encountered in alkali metal and alkaline-earth metal material stable compound is formed before hydroxide is migratory, put an end to those who return alkaline phenomenon to happen thereby.
If want to solve afore-mentioned problems, seasonable and roast irrigate build system, eduction irrigates the free water in building system, make alkali metal and alkaline-earth metal material are before translate into hydrate is migratory, produce mutual reaction to form stable compound, put an end to thereby return alkaline phenomenon to happen. But because boiler of this stage of project front row wants the coming year,the ability end April has ignition requirement, distance chimney is pouring makings construction ends have a year of time, irrigate that is to say build time passes one year to just can use boiler after ending roast, want to experience get damp period twice, return alkaline phenomenon to be able to happen inevitably, will cause the pecuniary loss that cannot redeem (only cost of raw materials with respect to the loss 1.8 million yuan of) , and also repair afresh hard on the technology, change liner. If use other way to undertake beforehand roast (if manufacturer puts forward to irrigate,build lumber, coal or coke are used to wait from chimney bottom after finishing have stir up trouble roast, section uses chimney bottom small internal heat (150~200 ℃ ) - medium baking temperature of bottom of 24h, chimney (250~350 ℃ ) - conflagration of bottom of 48h, chimney (150~200 ℃ ) - fall 36h, naturally to close to normal temperature hind bottom mouth, roast the plan) that the coping after be over installs the measure that prevent rain, carry out hard on the technology, the effect also is put in the problem on control, charge hard, unworkable.
Conversely, if use acid-proof brick to make liner, criterion cylindrical shell construction adopts plan of single slippery standard, average 2~3m/d, build by laying bricks or stones of the liner after 60d finishs slippery model of cylindrical shell of slippery model; is built do not affect periphery to build the construction that builds thing. Acid-proof brick won't produce material to return alkaline phenomenon, build by laying bricks or stones is built use an activity to a string of 1 dish, condole dish the canal is assembled and become with Φ48×315, than + small 350mm of diameter of 10.00m place liner, with 6 lever block (3t) serves as litre falling is to be the same as all, promote and drop what be used at platform, the carry makings mouth that hole of a 1000×800 sets to regard liner as material in the center of platform, expect on end to be sealed with board, solved chimney cylindrical shell and liner construction craft and problem of time limit for a project so. So, use acid-proof brick to make liner accord with the chimney execution condition of this project.
Zhengzhou flourish fills the fireproof material that serves as major to produce manufacturer, build the development history that the factory has had 20 years up to now, product performance is good, company from personnel of course of study 160 people, among them personnel of advanced and professional technology 12 people, year productivity amounts to 60 thousand tons, have product line of light qualitative, heavy simple stuff, all sorts of production, experiment, detect facility is complete, include 10 to distribute stock among them 400 tons shape to 1000 tons of series compressor, two (148 meters grow and 118 meters grow) kiln of high temperature channel.
Annals of fireproof data limited company is in furnace of kiln of Zhengzhou Rong Cheng industrial dedicate oneself to the service of one's motherland, industry of service high temperature is oneself, we bear tens of year the technology is accumulated, active and before look up ground is high temperature industry will make tomorrow make brand-newly, become hard " boiler and expert of liner of furnace of hot project kiln " .
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