CN103063527A - On-line testing method for thermal compressive strength of molded coal - Google Patents
On-line testing method for thermal compressive strength of molded coal Download PDFInfo
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- CN103063527A CN103063527A CN2013100004633A CN201310000463A CN103063527A CN 103063527 A CN103063527 A CN 103063527A CN 2013100004633 A CN2013100004633 A CN 2013100004633A CN 201310000463 A CN201310000463 A CN 201310000463A CN 103063527 A CN103063527 A CN 103063527A
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- 239000003245 coal Substances 0.000 title claims abstract description 156
- 238000012360 testing method Methods 0.000 title claims abstract description 80
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 37
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Abstract
The invention relates to an on-line testing method for thermal compressive strength of a molded coal, which comprises the following steps: step 1, drying pressed molded coals with required shapes in a forced air drying oven for standby; step 2, putting the molded coals between two high-temperature resistant alumina ceramic rods on a pressure plate of a press; step 3, moving an open or closed heating furnace on the press, putting the alumina ceramic rods and molded coals thereof in a constant temperature area of a heating hearth, and then buckling a hanging buckle of the heating furnace; step 4, connecting an inert gas protection passage, and setting the temperature to 600 DEG C to 900 DEG C for a temperature control meter for the heating furnace; step 5, running a peristaltic pump for allowing circulating cooling water to pass through a spiral annular cooling coil; step 6, carrying out rapid heating so that the temperature reaches the set value, and then carrying out automatic testing after keeping the constant temperature for 30 minutes; and step 7, continuously testing a plurality of molded coal samples, and calculating the arithmetic mean value as the thermal compressive strength. The on-line testing method realizes the on-line test of thermal compressive strength of a molded coal, can well stimulate the working conditions of molded coal in the high temperature and high pressure moving bed gasification furnace, and can provide the technical parameter guidance for gasification industrial production.
Description
Technical field
Technical field involved in the present invention is the moulded coal field tests, specifically can carry out on-line testing with the hot compressive strength of moulded coal to industrial gasification, has invented the moulded coal hot strength method of testing that can simulate under the industrial gasification condition.
Technical background
After coal was processed through exploit, washing, particularly process are mixed etc., its technological property had obtained optimization, but products obtained therefrom is many with a large amount of fine coal.Need to use user's (such as grate firing boiler, atmospheric fixed bed gasification furnace, lurgi pressure gasifier, converter etc.) of lump coal for some, the fine coal that then needs to work good is processed into " lump coal ", fine coal, coal slime, coal ash and coke breeze are processed into patch fuel with certain physicochemical property or the technological process of raw material, be called coal powder formation, its product is called moulded coal or formed coke, the general term moulded coal.The purpose of coal powder formation is not only for fine coal being become " lump coal ", the more important thing is in order to change the original character of coal, overcome the defective that fine coal exists, thereby poor quality, poor efficiency, heavy fine coal and the coke breeze of pollution are converted into the high-quality raw material of industry and efficient, clean industry and domestic fuel, to satisfy user's various demands.
Industrially belong to the fixed bed gasification type of furnace take lump coal, coke as the stove of fuel or raw material, the producer gas generator that the industries such as the coal gasifier of using such as Ammonia Production (comprise normal pressure, pressurization, water-gas generators etc.), blast furnace, machine-building are used and steam locomotive etc. more.Moulded coal can replace lump coal and coke to be used for these fixed bed type of furnaces, and the quality of effect, and key is whether the quality of moulded coal itself meets the requirements.Yet the hot compressive strength of moulded coal is more important with respect to other moulded coal index.The hot compressive strength of moulded coal is moulded coal can bear pressure under heating status index, and the poor moulded coal of hot compressive strength just may all be pulverized after moulded coal just enters stove, thereby makes the working of a furnace unstable, and the equipment that affects normally moves.In addition, the thermal stability of the moulded coal of generally using is directly related with the hot compressive strength of moulded coal, and the thermal stability of the higher moulded coal of hot compressive strength of moulded coal is better.Method of testing for the hot compressive strength of moulded coal mainly contains two classes at present: the first kind is that MT/T 1 073-2008 is for the method for testing of the hot compressive strength of moulded coal, also be the stove external test methods, its concrete steps are: 1. the moulded coal sample is put equably in 2～4 crucibles of people, built crucible cover; 2. muffle furnace is heated to 850 ℃ in advance, opens fire door, rapidly crucible is put into the flat-temperature zone, close immediately upper furnace door and timing, accurately heat 30min.After crucible is put the people, require furnace temperature in 8min, to return to (850 ± 15) ℃, and constant temperature, otherwise this time test is cancelled; 3. from muffle furnace, take out crucible, be cooled to room temperature; 4. taking-up moulded coal places on the force surface center of testing machine of regulation one by one, with the even velocity of displacement one-way force applying of 10～15 mm/min, and the numerical value that testing machine shows during record moulded coal cracking; As one group of measured value, be the hot compressive strength of moulded coal with the arithmetic mean of 10 moulded coal measured values.This kind method of testing is that moulded coal is after heat treatment tested the strength values that obtains behind the cool to room temperature, be equivalent to the cold conditions compressive strength after moulded coal passes through pyrolysis blink devolatilization, can not reflect moulded coal operating mode during actual use the in industry gasification furnace, so the moulded coal index that this method obtains can not well instruct the industrial applications of moulded coal, has very large defective.The method of testing of the hot compressive strength of Equations of The Second Kind moulded coal is nonstandard method of testing, is also referred to as stove build-in test method, and the concrete steps of the method are: 1. the moulded coal sample is put equably in 2～4 crucibles of people, covered silica sand on the moulded coal sample, build crucible cover; 2. muffle furnace is heated to 850 ℃ in advance, opens fire door, rapidly crucible is put into the flat-temperature zone, close immediately upper furnace door and timing, accurately heat 30min.After crucible is put the people, require furnace temperature in 8min, to return to (850 ± 15) ℃, and constant temperature, otherwise this time test is cancelled; 3. from muffle furnace, take out crucible, and use immediately crucible clamp removing from mould coal, place one by one on the force surface center of testing machine of regulation, with the even velocity of displacement one-way force applying of 10～15 mm/min, the numerical value that testing machine shows during record moulded coal cracking.As one group of measured value, be the hot compressive strength of moulded coal with the arithmetic mean of 10 moulded coal measured values.Although such method of testing can be simulated the operating mode in the industry gasification furnace to a certain extent, because moulded coal is directly exposed in the air when higher temperature test, make the moulded coal outer surface layer almost completely be in fired state; And the impact such as tested person condition, resulting hot strength and true hot compressive strength deviation are obvious, cause the index fluctuation of moulded coal very large in actual mechanical process, can not well instruct the industrial applications of moulded coal.
In sum, do not have at present a kind of can fine simulation industrial gasification condition under to the method for testing of moulded coal hot strength index, and some existing method of testings all exist very big defective can not finely instruct commercial production.The present invention does not need loaded down with trivial details testing procedure just can well simulate the interior operating mode of industrial actual motion gasification furnace, and the consumption of test is very low, and the hot compressive strength of therefore testing moulded coal has the characteristics such as efficient, convenient, quick, accurate.The index such as needed hot compressive strength when being particularly suitable for investigating moulded coal and being used for pressurized-gasification furnace.
Summary of the invention
The object of the present invention is to provide the method for testing of the hot compressive strength of moulded coal, with the on-line testing of the hot compressive strength of realization moulded coal, thereby provide required performance parameter for suitability for industrialized production accurately.
The present invention also aims to simultaneously above all kinds of method of testings are compared.
In order to reach above purpose, the hot compressive strength on-line testing of moulded coal of the present invention method is by the following technical solutions: the hot compressive strength on-line testing of moulded coal method may further comprise the steps: 1) with mould suppress cylindrical shape the moulded coal piece several, greater than 10, be put in the air dry oven for subsequent use behind dry 5h under 110 ℃ of temperature after slightly drying in the room temperature; 2) moulded coal is placed on the Multifunctional press up and down between two depression bars with breakpoint pattern, two depression bars are made by the high-strength aluminum oxide ceramic rod; 3) mobile open and close type heating furnace is regulated aluminium oxide ceramics depression bar and moulded coal sample and is in flat-temperature zone in the heating furnace on pressing machine, closes heating furnace and fastening switching and buckles; 4) open the inert gas valve, regulate inert gas flow 100 ~ 200ml/min by spinner-type flowmeter, by pipeline nitrogen is entered the heating furnace from open and close type heating furnace bottom through the ring pipe gas distributor; 5) operation peristaltic pump makes recirculated cooling water pass into the helical annular cooling worm and accept in the compressing tablet chilled water duct by metallic conduit; 6) regulate heating furnace temp controlled meter to 600 ~ 900
oThe C temperature, and require heating furnace in 20min, to reach design temperature; 7) constant temperature 30min after the heating furnace meter demonstration reaches design temperature; 8) operating pressure machine is automatically finished test, record and is preserved test result; 9) regulate the depression bar position, withdraw from specimen, open fast the open and close type heating furnace and take out the moulded coal that breaks, change the moulded coal sample that the next one will be surveyed, close heating furnace, treat that instrument temperature returns to design temperature, repeating step 7 is to step 9; 10) after all tests finish, close successively protection gas, heating furnace, naturally cool off until instrument and close chilled water and remove heating furnace after being down to room temperature.
Required moulded coal size can be made according to user's needs in the above method of testing, and the contact area that test only needs to calculate moulded coal and aluminium oxide ceramics rod can draw maximum hot compression strength value.
Need in the described method of testing moulded coal that makes is carried out series of preprocessing, to guarantee that moulded coal is at test process performance homogeneous.
Moulded coal is being tested anteposition between two high-strength aluminum oxide ceramic rods in the described method of testing, following aluminium oxide ceramics rod is installed on the pressing machine pressing disc, top aluminium oxide ceramics rod is placed on above the moulded coal, and platen is 2-3cm on the upper ceramic rod test front distance pressing machine, such method of testing is in order to prevent moulded coal generation chemical reaction when when test contacts with other parts, to reduce simultaneously high temperature to the impact of equipment.
Pass into the inert gas of 100 ~ 200ml/min in the described method of testing, making the moulded coal test environment is high temperature inert atmosphere, the operating mode during with better simulation industrial applications.Gas flow can not be too high also can not be too low, too much heat is taken in too high meeting out of, affects the required temperature stability of moulded coal hot strength, the too low moulded coal partial oxidation that then causes easily of flow.
In the described method of testing, required open and close type heating furnace heating zone and flat-temperature zone are long, the stove high insulating effect.Heating rate is fast, from room temperature to 900 a ℃ need 20min.
In the described method of testing, the displacement moulded coal should carry out rapidly, to ensure minimum thermal loss so that fast quick-recovery probe temperature and reduce the oxidized probability of moulded coal.
The hot compressive strength on-line testing of moulded coal of the present invention method can guarantee the successively follow-on test of a plurality of samples.
The used proving installation of the present invention is the applicable nonstandard processing of the hot compressive strength on-line testing of moulded coal, mainly comprise the parts such as motor, speed reduction unit, portable plate, base plate, top board, ball screw, lifting column, shaft bearing plate column, stop, scrambler, platen and pressure inductor, for cooperating the hot compressive strength of open and close type heating furnace test moulded coal, need two of high strength high temperature oxidation resistant aluminium ceramic rods.
Press Control System comprises main frame, display and carries pressure test software in the proving installation that adopts in the inventive method, under the breakpoint test pattern, pressure/pressure in the automatic drafting of the computing machine meeting moulded coal loading process and the relation of the relation of test duration, pressure/pressure and pressing disc stroke, can stop test in the moment that moulded coal destroys, and can record and show maximum pressure/pressure that moulded coal bears before breaking.
Open and close type heating furnace and instrument temperature-controlling system mainly comprise heating furnace, temperature control Displaying Meter, thermopair and wire etc. in the proving installation that adopts in the inventive method; Heating furnace comprises again burner hearth, heating furnace silk and furnace shell etc., and burner hearth is the reducing burner hearth, and the heating zone is of a size of Ф 70 * 170mm, the burner hearth heat preservation zone is identical two sections, lay respectively at the top and bottom of burner hearth heating zone, it is of a size of Ф 51 * 40mm.
Comprise some parts in the inert gas protection system in the proving installation that adopts in the inventive method and be connected gas line, mainly contain high-pressure nitrogen bottle, nitrogen reduction valve, gas rotameter, ring pipe gas distributor and stainless steel gas fluid line; Ring pipe gas distributor ring internal diameter is Ф 51mm, and the endless tube internal diameter is Ф 3mm, is evenly distributed with 8 of the ventholes of Ф 2mm on the interior ring.
The effect of pressing machine inductor protection water-cooling system is protection pressing machine inductor in the proving installation that adopts in the inventive method, prevents because the heating furnace high-temperature radiation causes the pressing machine inductor to damage or be malfunctioning.The critical piece of pressing machine inductor protection water-cooling system is accepted compressing tablet, helical annular cooling worm, peristaltic pump, rubber water pipe and metallic water pipe; Accept compressing tablet and directly screw in the inductor bottom thread by screw, it is of a size of Ф 50 * 100mm, and an end has the outer silk of M12 * 30mm, the duct of two Ф 6 * 50mm is arranged accepting the compressing tablet upper end, is used for passing into water quench compressing tablet protection inductor; The helical annular cooling worm is that the metal thin tube of flexible is coiled into, and tubule is of a size of Ф 5 * 1mm, and helical annular cooling worm height is 100mm, just in time can entangle fully and accept compressing tablet; Peristaltic pump mainly provides chilled water accepting the power that circulates of compressing tablet inside and helical annular cooling snake inside; take away furnace radiant by chilled water and accepting the heat of compressing tablet; can directly protect pressure transducer, make it be in all the time the room temperature state normal operation.
Because the present invention is through a series of technological improvement and process exploitation, can realize that the test of the hot strength of moulded coal carries out under near the industrial gasification condition, and used equipment and instrument all are very high through appropriate design and automaticity, so this method of testing is having significant raising aspect the hot compressive strength on-line testing of moulded coal.In sum, the invention has the beneficial effects as follows and to implement on-line testing to the hot compressive strength of moulded coal that can reflect like this applying working condition of industrial shaping coal, gasification has directive significance to industrial shaping coal, and has realized safe, convenient, accurate.Fig. 1 is for adopting the inventive method to record the hot compressive strength of moulded coal and the contrast of other method data measured.Can be found out by Fig. 1 Data Comparison, rising along with temperature, adopt the hot intensity test method of first kind moulded coal, no matter whether bury sand, the hot compressive strength of moulded coal keeps within the specific limits, not significant rising or reduction trend, and can also reflect among the figure that burying sand under different probe temperatures tests than not burying husky test test number height.The hot compressive strength of moulded coal that first kind method of testing is measured than the inventive method is low; Adopt the Equations of The Second Kind method of testing and adopt the inventive method, the hot compressive strength of moulded coal all raises with probe temperature.The hot compressive strength of moulded coal is insensitive to different method of testing variations under the low-temperature test temperature, fluctuates about about 3MPa greatly; There were significant differences for different method of testings for the hot compressive strength of moulded coal under the high temperature, and this species diversity is more obvious more than 800 ℃ the time.Because first kind method of testing will be tested by cool to room temperature after thermal treatment under the moulded coal secluding air, moulded coal can not embody in the interaction between the hot lower various components, between cementing agent and the coal, so use the operating mode of such method of testing in can not fine reaction gasification furnace.Bury husky intensity a little higher than do not bury husky intensity be because bury sand can the partial rcsponse oxidation on the impact of moulded coal hot strength; Equations of The Second Kind method of testing and the inventive method can guarantee that moulded coal tests in the situation of being heated, the moulded coal inner material at high temperature formed compressive strength that interacts can be good at reflecting in this class testing method, and the compressive strength of therefore testing is at high temperature high than first kind method of testing.The hot compressive strength of moulded coal of simultaneously the inventive method test is higher than the Equations of The Second Kind method of testing, reason is that the inventive method more can guarantee the temperature uniformity of moulded coal in test process, the Equations of The Second Kind method of testing is in test process, and moulded coal constantly cools off, and the briquette strength of testing is affected.Test data from Fig. 1 also can be found out, utilizes the measured result of the present invention and other classic method that certain contrast is arranged, and advantage of the present invention is that the moulded coal hot strength of test can directly reflect the operating mode of gasification briquette in stove.
Description of drawings
Fig. 1 this method records the hot compressive strength of moulded coal and the contrast of other method data measured;
Fig. 2 is the general arrangement structural representation of the hot compressive strength online testing device of moulded coal that adopts in the inventive method;
Fig. 3 is the heating system stove size sectional view of the hot compressive strength online testing device of moulded coal that adopts in the inventive method.
Among Fig. 2,1. pressing machine scrambler, 2. pressing machine motor and speed reduction unit 3. pressing machine lifting column and ball screws thereof thereof, 4. pressing machine portable plate, 5. high-strength alumina ceramic rod, 6. heating furnace burner hearth heating zone, 7. sample, 8. open and close type heating furnace, 9. pressing machine top board, 10. helical annular cooling worm, 11. accept compressing tablet chilled water duct, 12. peristaltic pumps, 13. annular tube shaped gas distributor, 14. the nitrogen reduction valve, 15. spinner-type flowmeters, 16. high-pressure nitrogen bottles.
Embodiment
The embodiment 1 of the method for testing of the hot compressive strength of moulded coal of the present invention, may further comprise the steps: 1) suppress the moulded coal piece of cylindrical shape greater than 10 with mould, moulded coal is of a size of Ф 25 * 25mm, dry in the room temperature be put in behind the 1h in the air dry oven for subsequent use behind dry 5h under 110 ℃ of temperature; 2) moulded coal is placed between two aluminium oxide ceramics rods on the pressing machine platen; The aluminium oxide ceramics rod is two in the present embodiment, wherein long diameter is 50mm, length is among 112mm(Fig. 2 5), a short diameter is 50mm, length is 80mm, long one lower, and placed type coal sample (among Fig. 2 7) is then placed short ceramic alumina rod in the moulded coal top in the top; 3) mobile open and close type heating furnace is in the heating furnace flat-temperature zone aluminium oxide ceramics rod and moulded coal on Multifunctional press, and the fastening heating furnace opens and closes and buckles; The open and close type heating furnace is furnished with the support platform of reinforcing bar welding, and this support platform is fixed on the pressing machine portable plate (among Fig. 2 4); 4) open the nitrogen valve, regulate nitrogen flow to 100ml/min by spinner-type flowmeter, nitrogen enters the heating furnace through the ring pipe gas distributor from open and close type heating furnace bottom, regulate the heating furnace temp controlled meter to temperature required, 600 ℃, 700 ℃, 850 ℃ or 900 ℃; And the used time, guarantee to reach in the 20min temperature required; Annular tube shaped gas distributor (among Fig. 2 13) internal diameter is Ф 51mm, the diameter 50mm that is a bit larger tham the pressing machine pressing disc, can be enclosed within on the pressing machine pressing disc, the endless tube internal diameter is Ф 3mm, be evenly distributed with 8 of the ventholes of Ф 2mm on the interior ring, and the aperture of 8 ventholes same level face of arranging becomes 30 degree angles, is conducive to that gas uniform is smooth and easy to be passed in the burner hearth.Placing the open and close type heating furnace in the ring pipe gas distributor being enclosed within on the pressing machine pressing disc before the pressing machine top.The operation steps that passes into nitrogen protection gas is, then opening high pressure nitrogen cylinder (among Fig. 2 16) valve unclamps nitrogen reduction valve (among Fig. 2 14), regulates spinner-type flowmeter (among Fig. 2 15), makes nitrogen flow about 100ml/min; 5) operation peristaltic pump (among Fig. 2 12) makes recirculated cooling water pass into helical annular cooling worm (among Fig. 2 10) by metallic water pipe and accepts in the compressing tablet chilled water duct (among Fig. 2 11); Accept compressing tablet and directly screw in the inductor bottom thread by screw, it is of a size of Ф 50 * 100mm, and an end has the outer silk of M12 * 30mm, the duct of two Ф 6 * 50mm is arranged accepting the compressing tablet upper end, and 2 water-cooled ducts are positioned at and meet dish 1cm place, upper end and 4cm place.Peristaltic pump mainly provides chilled water accepting circulating of compressing tablet inside and helical annular cooling worm inside, water is not divided into two-way before entering the helical annular cooling worm after by the peristaltic pump supercharging and accepting platen chilled water duct, one the tunnel walks the helical annular cooling worm, one the tunnel walks to accept two ducts of platen chilled water, flows back in the container by being combined into one the road behind cooling worm and the chilled water duct respectively.6) set the heating furnace temp controlled meter to temperature required, this process is carried out manual operation at open and close type heating furnace temperature control dial plate, arranges in the short time and is raised to respectively above-mentioned probe temperature from room temperature, then constant temperature 30min.Test pattern is transformed into the breakpoint test pattern, clicks the beginning testing button, computer will automatically be finished test, record and preserve test result; 7) the decline button on the click pressing machine control computer, make pressing machine compression leg decline 1cm, then open fast the open and close type heating furnace and take out the moulded coal that breaks, change rapidly next moulded coal sample, close heating furnace, after instrument temperature returned to test condition, the hit testing button was tested again; The arithmetic mean of the compressive strength of the moulded coal sample that 8) test is obtained is as the hot compressive strength numerical value of this batch moulded coal.Because the size of moulded coal has been input in the middle of the computing machine, moulded coal and aluminium oxide ceramics rod, aluminium oxide ceramics is excellent and pressing machine on the contact area that connects between the dish known, the peak power that inductor transmission hollow coal bears before fracture, computer software calculates and demonstrates the hot at compressive strength for line contact of moulded coal according to P=F/S.In order to reduce stochastic error, test moulded coal sample is calculated arithmetic mean, just obtain the hot compressive strength numerical value of batch moulded coal.
Claims (7)
1. the hot compressive strength on-line testing of moulded coal method comprises following testing procedure: it is some 1) to suppress the moulded coal of cylindrical shape with mould, more than 10, is put in the air dry oven for subsequent use behind dry 5h under 110 ℃ of temperature after room temperature is dried; 2) moulded coal vertically is placed between two high-strength aluminum oxide ceramic rods on the pressing machine platen with breakpoint pattern, guarantees that two parallel surfaces of moulded coal bear pressure; 3) mobile open and close type heating furnace is in the heating furnace aluminium oxide ceramics rod and moulded coal on pressing machine, and adjustment type coal sample position makes it be in heating furnace flat-temperature zone central authorities; 4) pass into inert gas and enter in the heating furnace, regulate the heating furnace temp controlled meter to 600 ~ 900 ℃ of design temperatures, and quickly heat up to above-mentioned design temperature; 5) heating furnace meter reaches constant temperature 30min behind the above-mentioned design temperature, and the operating pressure machine is finished test, record result; 6) make pressing machine compression leg decline 1cm by automatic control, open fast the open and close type heating furnace and take out the moulded coal that breaks, change next moulded coal sample, close heating furnace, after instrument temperature returns to probe temperature and constant temperature 30min, again test; 7) the sample compressive resistance that test is obtained or the arithmetic mean of compressive strength are as the hot compressive strength numerical value of this batch moulded coal.
2. according to the hot compressive strength on-line testing of right 1 described moulded coal method, it is characterized in that the moulded coal sample is the parallel right cylinder of upper and lower surface.
3. according to the hot compressive strength on-line testing of right 1 described moulded coal method, it is characterized in that the moulded coal sample can carry out the elevated temperature strength test.
4. according to the hot compressive strength on-line testing of right 1 described moulded coal method, it is characterized in that the moulded coal sample places between two heat-resisting aluminium oxide ceramics, prevent that moulded coal from chemical reaction occuring in test process.
5. according to the hot compressive strength on-line testing of right 1 described moulded coal method, it is characterized in that passing into inert gas by the inert gas distributor protects moulded coal.
6. according to the hot compressive strength on-line testing of right 1 described moulded coal method, but it is characterized in that follow-on test more than 10 moulded coal samples, guarantees data accuracy.
7. according to the hot compressive strength on-line testing of right 1 described moulded coal method, it is characterized in that the inert gas that passes into can be He, Ar or N
2
Priority Applications (1)
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| CN106885739A (en) * | 2017-03-31 | 2017-06-23 | 武汉科技大学 | A kind of hot compression strength online testing device of coke |
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| KR20080110076A (en) * | 2007-06-14 | 2008-12-18 | 한국건설기술연구원 | Heating compression strength test system and automatic heating compression strength test method of high temperature using thereof |
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Application publication date: 20130424 |