CN1113571A - Automatic calcium analyzing method and system used on cement production line - Google Patents

Abstract

The method for automatic analysis of calcium content in cement production line features that quantitative cement sample and hydrochloric acid react in sealed container to generate CO2, whose amount is converted into current (or voltage) by pressure transducer, and through computer's processing, the production executing mechanism is instructed to automatically regulate the proportion of the raw materials for optimal calcium content. A CO2 generator and temp. compensating network are set up for ensuring the precision of the system. All the operations are automatically completed.

Description

Automatic calcium analyzing method and system used on cement production line

The present invention relates to the carbon dioxide air pressure amount that a kind of lime carbonate of specified quantitative produced and be converted to electric current (or voltage) amount behind saturated chemical reaction, and compare with demarcating electric current (or voltage) amount, to determine and to be controlled at the method and the system thereof of the automatic calcium analyzing control of calcium content and relevant composition proportion in the raw material on the cement producing line.

In the Cement Production process, the preparation of raw material is to guarantee one of critical process of cement product quality.In other words, i.e. the content of composition in raw material such as lime carbonate iron, to the end product quality influence of cement greatly.At present, advanced big-and-middle-sized cement mill generally is to use behind raw material preparation powder shop, sampling is pressed into methods that thin slice send fluorescence analyser to measure and determines calcium oxide content in the raw material, then return the calcic material component proportioning in the notice raw material formulation operations personnel adjustment termination raw material again, so that the calcium oxide content in the raw material reaches optimum value.This detection method, because each check and analysis all must expend the long time, by the time caused a considerable amount of non-certified products during to the composition proportion correction in the raw material, so even quite advanced fluorescence analyser has been arranged, still need mainly depend on raw material formulation operations personnel artificial experience guarantee the correct proportioning of raw ingredients; In addition, the water content in the raw material and grain fineness or the like factor, the value that all causes fluorescence analyser to be measured easily produces bigger mistake.Moreover, the installation of fluorescence analyser and service condition are required harsh, the capital assets input is very high, and common small-sized cement factory generally all is reluctant to purchase, and promptly enables to equip fluorescence analyser, can't realize that also line closed loop controls automatically.

Purpose of the present invention, to provide a kind of in the manufacture of cement flow process exactly, can on cement producing line, take a sample automatically to the calcium carbonate content in the raw material by closed loop (or semiclosed loop) shape, analyzing and testing, quick Correction and Control raw ingredients proportional quantity, and the equipment needed thereby one-piece construction is simple, and general workman is easy to operate, and maintenance management is convenient, cost and operating cost is low, accuracy of detection is high, the stable and reliable for performance cement producing line automatic calcium analyzing control method and the system of implementation method.

For realizing the purpose of foregoing invention, the technical method that we adopt is: carry out the carbon dioxide gas scale of construction that produced behind the saturated chemical reaction in closed container with lime carbonate in the quantitative sample and hydrochloric acid, be converted to electric current (or voltage) amount in the pressure unit of selling on the input market, the feed-in computer controller is analyzed computing again, compare processing according to the size of ultimate current (or voltage) amount and with the theoretical standard value, determine the calcium content in the raw material, then computer controller sends control command signal, commander's raw material preparation topworks adjusts automatically, revise the proportioning components amount of raw material, thereby reach the best calcium content in the automatic control raw material.Also that is to say: the system that implements the inventive method also comprises parts such as pressure unit, computer controller and raw material preparation topworks except the carbon dioxide generating means of brand-new design.Newly-designed carbon dioxide generating means is fitted in by the raw material ball grinding machine discharging opening powdery raw material conveying belt afterwards, it is thrusted the sampler that is installed with, baker, weigher, reactor and quantitatively annotates the notes acid device that send hydrochloric acid and carry out in reactor after saturated chemical reaction finishes at sample and hydrochloric acid in reactor by holding mutually in single file successively, and the clearer of injection flushing with clean water assembles in reactor.Our used reactor be by a folding base and one can with sit the sealing kettle that fastens that matches at the bottom of the folding and constitute, acid-filling mouth set on the kettle is connected with the acid delivering tube of the sour device of notes, the water inlet on the kettle is communicated with the water injection pipe of washer; Sample spoon on the sampler promptly carries out straight reciprocating motion after start, when it moves forward to terminal point, just shovel is loaded onto some powdery samples on the raw material conveying belt, when treating that sample spoon return back to sampler feeding belt top, promptly overturn, sample is poured on the feeding belt, and send on the baking barrel of falling the baker of accepting its back by feeding belt, the rotation of baking barrel carries sample and passes the baker oven dry, then send the hopper that falls on the weigher; When the dry sample material in hopper reaches rated capacity gradually, pass through aut.eq., blanking is stopped, gate below, its rear hopper bottom be downward slippage to the charging conduit of following, when charging conduit moves down into terminal point, the material stock dish that is being provided with in the folding base of the reactor that the notch positive alignment of lower end is being opened wide, material rises the gate one of bottom and opens, sample just all is slipped in the material stock dish along charging conduit, charging conduit shrinks back immediately, the folding base of reactor rising by direct motor drive simultaneously, fasten until root edge mouth sealing with kettle, start then and annotate sour device, in reactor, inject the required hydrochloric acid content of saturated chemical reaction that calculates according to the chemical reaction equilibrium equation, make the sample in the acid solution submergence material stock dish, the carbon dioxide that sample is produced with the hydrochloric acid saturated reaction of q.s in reactor promptly is input in the pressure unit after filter removes remaining acid gas by the gas outlet of kettle end, be closed between reactor and pressure unit pipeline this moment, and sample and hydrochloric acid chemical reaction in reactor finishes the final carbon dioxide gas scale of construction that produces in back and promptly converts electric current (or voltage) amount to by pressure unit; The output port of pressure unit is connected with the input interface of computer controller, and the output interface of computer controller is to be connected with the discharging gauge tap of each material in the production material preparation topworks.After electric current (or voltage) amount of pressure unit input computer controller is handled by analysis, can measure the calcium content in the sample, computer controller is just revised the proportioning of adjusting the calcic material automatically according to Calculation results instruction raw material preparation mechanism.

About the inventive method and system, up to the present not seeing as yet has any documents and materials openly to introduce, with the inventive method and system, just can be implemented in and be closed loop automatically continuously uniform sampling, mensuration at random on the cement producing line, and timely Correction and Control raw-meal ingredient automatically; And substitute sampler with this simple work of hand sampling and take a sample automatically, promptly be the on-line automatic analysis and Control of semi-closure ring type system, that has just been save the Installation and Debugging of sampler and daily service work, from the reactor to raw material, prepare topworks, still with preceding to chat the on-line automatic analysis and Control of closed loop system the same.After data that will be relevant and regulatory process existed in the computer admittedly, any average skilled worker all can be implemented prison to system of the present invention and show and operate; Nearly all control actuating component all is general electromagnetic component in the system, and the utmost point is convenient to maintenance; With electric signal calibrating analysis, precision height, stable and reliable for performance.The price of used pressure unit on market is not high, and computer controller only selects for use the simplest single card microcomputer to make movement just has been enough to competent undertake all input signal analyzing and testing processing and instruction transmission work.Total system cost (comprising erected cost) is no more than half of a fluorescence analyser price.

Below, describe in detail by the specific embodiments of accompanying drawing the inventive method and system.

Fig. 1 is a system architecture of the present invention, especially the structural representation of carbon dioxide generating means.

When being powdery by grinding in bowl mill (1), raw material pass out on the raw material conveying belt (2), before sending into raw material silo, the sample spoon of the sampler in the carbon dioxide generating means (3) promptly begins to start sampling, the straight reciprocating motion of sample spoon adopts simple toggle or cam elasticity guide-bar mechanism all can realize.The planform of sample spoon and size are with cycle detection time and the detection limit decision that sets.For example, we set a sense cycle is 15 minutes, each sample that detects is 5 grams, reciprocal 30 times of sample spoon per minute, the 14-17 milligram of at every turn taking a sample, be 12 minutes promptly required sample time, because raw material ball grinding machine (1) discharging is continuous, the time interval of the each sampling of sample spoon is identical, is online grab sample, and visible sample is all to exist.Adjust the width or the angle of inclination of sample spoon, just what of the each sampling amount of scalable.Sample spoon can cut with scissors the front end place that is contained in thief rod, when sample spoon is contracted to sampler (3) feeding belt when top, promptly answers back to the shifting block that is packed on the feeding belt frame and upset voluntarily is poured into sample on the feeding belt.The transfer rate of the feeding belt of sampler (3) is advisable with the 30-35 mm/second.

The baking barrel of baker (4) is preferably made of stainless-steel tube, and its end is fitted in the below of sampler (3) feeding belt terminal, to accept the sample that falls.The baking barrel is sleeved in the cartridge heater of making of fire resistive material.Heating tube length 400-600 millimeter, as thermal source, electric furnace heating wire revolves union thimble outside barrel with the electric furnace heating wire energising.Temperature in the baking barrel is controlled at about 100 ℃, the baking barrel is rotated in the inwall of cartridge heater by motor drives, its sample also advances at the steel cylinder inside spin, transfer rate preferably is controlled at the 10-12 mm/second, even sample toasts 40-50 second in the baking barrel, to guarantee to remove moisture content contained in the sample, eliminate weighing error to sample.Weigher (5) preferably is 10 milligrams the pellet type weighing scale to test twisting force transformation of the way with sensibility reciprocal, replaces original-pack thing dish with special hopper, hopper is fitted in the below of baker (4) baking barrel discharge end, to accept the sample of having dried.When the dry sample material amount in the hopper reaches the weighing value of setting, balance just is in equilibrium-like, this moment, balance just shut voluntarily, and touch magnetic switch, make baker (4) and sampler (3) just begin the work of new round feed again, simultaneously charging conduit (6) upwards shrinks back original position, and the drive motor of reactor folding base (9) is about to it and is urged to kettle (10) root edge mouth sealer meeting with reactor up.The folding base (9) and the kettle (10) that constitute reactor all can be made of the engineering plastics of acid and alkali-resistance.Because it is just much of that the each detection limit of sample generally is set at 5 grams, so that the volume of reactor need not is too big; Can use O shape acid and alkali-resistance rubber seal as airtight and watertight padding between folding base (9) and kettle (10) buckling surface.

Annotating the simple proposal of sour device (8) is to adopt unidirectional quantitative suction to annotate the pressure type structure.Can use common 100 milliliters of all-glass syringes transformation of the way, be about to the syringe body and fix, with micromachine drive move behind its plunger the suction acid solution and forward the pushing notes give; Be equipped with one way stop peturn valve between threeway valve nozzle of suit on the injector to inject mouth, valve nozzle and acid delivering tube that the acid inlet of kettle (10) is connected, also adorning one way stop peturn valve on the other acid suction hose that patches in the sour pond of storage of valve nozzle, refluxing to stop acid solution.

Used concentration of hydrochloric acid is got 40% and is advisable, and concentration is excessive, easily causes the working environment acid mist too many, the corrosion equipment component; Acid strength is too low, must influence the speed of chemical reaction, if meet in the sample bigger particle is arranged, and also can't complete reaction cause the detection error.

The clear water of flushing reactor need have certain pressure, can make with cooling-water pump and water storage tank assembling that lathe installed the embodiment of cleaning (7), docks with water inlet on the reactor kettle (10) with the water delivering orifice of cooling-water pump; Also can be that water inlet on the kettle (10) and the general road of tap water are connected, supply to cut off the water with solenoid valve therebetween.

Pressure unit (13) is preferably selected PMC133 type (Germany produces), its precision height, good stability for use.In the middle of the connecting line of reactor kettle (10) gas outlet and pressure unit (13) air intake opening, preferably install a filter cleaner (11) additional, in order to remove the sour composition in the carbon dioxide of from reactor, exporting behind the chemical reaction, the protection pressure unit; Before pressure unit (13) air intake opening, must install a vent valve (12), after being used for detecting end, get rid of the residual gas in pressure unit (13) air chamber at every turn.Vent valve (12) can use general two-position two-way solenoid valve.

The amount of gas pressure that carbon dioxide produces in container is relevant with gas temperature, promptly should satisfy Charles's law, the gas of certain mass, and under the situation of constancy of volume, its pressure is directly proportional with thermodynamic temperature: P1/P2=T1/T2; 1 ℃ of the every rising of temperature (or reduce), the pressure that increases (or minimizing) equal it in the time of 0 ℃ pressure 1/273.Influence for the compensation temperature variation, guarantee the detection and the control accuracy of total system, the reactor that is preferably in system of the present invention is provided with a temperature compensation network (14) to the computer controller pipeline, and the compensation precision of this temperature compensation network (14) should be able to reach 4 ‰, so that (13) and pressure unit (13) to the temperature conditions of computer controller (16) and the pipeline that is connected therebetween can keep identical from the reactor to the pressure unit.

Display screen (15) preferably and computer controller (16) is same is fitted in the pulpit, so that visual display detecting result and control operation.The discharging gauge tap of each material in the raw material preparation topworkies (17) all is connected with the output interface of computer controller (16).

Claims (3)

1, the calcium content in a kind of cement producing line raw material and the automatic calcium analyzing control method of composition proportion, it is characterized in that: in closed container, carry out the carbon dioxide gas scale of construction that saturated chemical reaction was produced with lime carbonate in the quantitative sample and hydrochloric acid, be converted to electric current (or voltage) amount in the input pressure transmitter, feed-in computer controller analyzing and processing is sent command signal commander raw material preparation topworks by computer controller and is adjusted the best calcium content that the raw ingredients proportional quantity is controlled raw material automatically.

2, a kind of with amount of gas pressure be converted to electric current (or voltage) with determine and the control raw material in the cement producing line automatic calcium analyzing control system of calcium content and relevant composition proportion, comprise pressure unit (13), computer controller (16) and raw material preparation topworks, it is characterized in that: being fitted in the other carbon dioxide generating means of raw material ball grinding machine (1) discharging opening raw material conveying belt (2) afterwards is the sampler (3) that is installed with by accepting in single file successively, baker (4), weigher (5), reactor and annotate sour device (8), washer (7) assembles, reactor seals the kettle formation that matches and fasten by folding base (9) and with folding base (9), charging conduit (6) is being docked in gate below, hopper bottom on the weigher (5), charging conduit (6) is when being displaced downwardly to terminal point, material stock dish in the folding base (9) that the notch positive alignment of lower end is being opened wide, acid-filling mouth on the kettle (10) is connected with the acid delivering tube of annotating sour device (8), water inlet on the kettle (10) is communicated with the water injection pipe of washer (7), gas outlet on the kettle (10) is communicated with the air intake opening of pressure unit (13), the output port of pressure unit (13) is connected with the input interface of computer controller (16), and the output interface of computer controller (16) is connected with each discharging gauge tap in the raw material preparation topworkies (17).

3, a kind of cement producing line automatic calcium analyzing control system according to claim 2, it is characterized in that: in the middle of reactor kettle (10) gas outlet and pressure unit (13) air intake opening connecting line, adorning filter cleaner (11), at the pre-installed vent valve (12) that is equipped with of pressure unit (13) air intake opening, to computer controller (16) pipeline, be provided with temperature compensation network at reactor.

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