CN104458805A - Pulverized coal suspension combustion characteristic trial furnace for cement kiln - Google Patents
Pulverized coal suspension combustion characteristic trial furnace for cement kiln Download PDFInfo
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- CN104458805A CN104458805A CN201410794827.4A CN201410794827A CN104458805A CN 104458805 A CN104458805 A CN 104458805A CN 201410794827 A CN201410794827 A CN 201410794827A CN 104458805 A CN104458805 A CN 104458805A
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Abstract
The invention discloses a pulverized coal suspension combustion characteristic trial furnace for a cement kiln. The pulverized coal suspension combustion characteristic trial furnace comprises an air source system, a hot air gun, an L-shaped quartz tube, a furnace body heating system and a suspension furnace body temperature monitoring and collecting system, wherein air with proper pressure flow velocity is supplied through the air source system, and is pre-heated through the hot air gun and then the pre-heated air is introduced into the furnace body heating system from the L-shaped quartz tube, so that the input pulverized coal is combusted in a suspension state; the data of temperature changingalong with timein a pulverized coalcombustion process can be acquired by virtue of the suspension furnace body temperature monitoring and collecting system; a curve of the temperature changing along with time of the pulverized coal in the suspension and combustion state is drawn, so that the combustion thermal characteristic of the pulverized coal can be evaluated according to the curve. Compared with the general thermoanalysis technology of the pulverized powder, the trial furnace has the advantages that when the required testing temperature is reached and the heat balance is achieved,the test and calculation of samples to be tested can be completed for only 10 minutes, so that the trial furnace is quick and convenient to operate, and high in accuracy; meanwhile, continuous experiment can also be carried out without generally needing to wait the reduction of the temperature to the room temperature like thermogravimetric analysis, and therefore, a large amount of time can be saved.
Description
Technical field
The present invention relates to thermal-analysis instrumentation field, more specifically to cement kiln coal dust suspension combustion attribute testing stove.
Background technology
Burning Behavior For Pulverized Coal is one of important content of coal combustion theoretical research, for industrial coal of cement, the combustion problem of fuel is that dry method production line runs key up to standard, therefore further investigate the combustion characteristics of coal dust, timely and effectively analysis and assessment are carried out to various coal dust, for optimization coal dust firing condition, improve the operating mode of cement producing line, improve manufacture of cement quality, reduce manufacture of cement cost, have positive meaning.
Adopt horizontal tube test method(s) to the research of catching fire of pulverized coal particle is main in early days, vertical furnace tube test method(s), the modern times then develop into such as static granule technology, Thermogravimetric analysis, laser technology etc.In early days, researcher is the combustion characteristics utilizing thermobalance studying coal powder, but affected many factors, and to test for different thermobalances the tail-off time obtained be not identical, even if same balance, also can due to coal dust amount number, the speed of firing rate etc. difference also can obtain different results.Simultaneously because firing rate is too low, differ very with actual inner operating.
These coefficients be all the static combustion setting up coal dust basis on, although can the combustion case of evaluation and foreca coal dust in cement industry to a certain extent, in its fired state and cement actual production, still there is very large difference.And due to the cement industry production singularity of coal combustion condition, these combustion characteristics evaluation methods might not be applicable to the needs of production of cement industry.
Summary of the invention
The object of this invention is to provide a kind of cement kiln coal dust suspension combustion attribute testing stove of needs of production of applicable cement industry.
To achieve these goals, present invention employs following technical scheme:
Cement kiln coal dust suspension combustion attribute testing stove, comprises air supply system, heat gun, " L " shape quartz ampoule, body of heater heating system, the monitoring of shower furnace temperature and acquisition system;
Described air supply system comprises air compressor, the first reduction valve, gas buffer tank, the second reduction valve and gas meter; The outlet of described air compressor is connected through the entrance of the first reduction valve with gas buffer tank, and the outlet of gas buffer tank is connected with gas meter entrance through the second reduction valve;
Described heat gun comprises ceramic pipe, high-temperature plastic gel material, gas access, gas vent, ceramics pole, bracing frame, heat gun high temperature resistance silk, heat gun overheat protector thermopair and heat gun insulation material; Described ceramic pipe one end is installed with gas access by the sealing of high-temperature plastic gel material, and gas access exports with gas meter and is connected; The ceramic pipe other end is installed with gas vent by the sealing of high-temperature plastic gel material, and gas vent is connected with the lower end air intake opening of " L " shape quartz ampoule; Ceramics pole is arranged in ceramic pipe by bracing frame, ceramics pole is wound around and is provided with heat gun high temperature resistance silk; Heat gun overheat protector thermopair is close to ceramic pipe outside wall surface, and heat gun overheat protector thermopair is connected with on/off temp controlled meter; Heat gun wind-warm syndrome control thermopair is arranged on gas vent and goes out, and heat gun wind-warm syndrome controls thermopair and is connected with controllable silicon temp controlled meter; Heat gun insulation material is wrapped in ceramic pipe outside wall surface;
Described body of heater heating system comprises suspension body of heater, high temperature fixes brick, shower furnace sealing thermal insulation room, coal dust feed pipe and exhanst gas outlet; Suspension body of heater is fixed brick by high temperature and is fixed in shower furnace sealing thermal insulation room, suspension body of heater lower end is connected with the gas outlet, upper end of " L " shape quartz ampoule, suspension body of heater end face seals, coal dust feed pipe is arranged in suspension body of heater through suspension body of heater end face, shower furnace sealing thermal insulation room end face is stretched out in coal dust feed pipe upper end, and porch, coal dust feed pipe upper end is provided with gland bonnet; Suspension body of heater is also provided with exhanst gas outlet, and it is outdoor that exhanst gas outlet stretches out shower furnace sealing thermal insulation; Evenly be provided with heating tube around suspension body of heater, heating tube comprises quartz glass tube and body of heater high temperature resistance silk, and body of heater high temperature resistance silk is wrapped on quartz glass tube;
Described shower furnace temperature monitoring and acquisition system comprise suspension body of heater monitoring thermopair, temperature controls/gather dual-purpose thermopair, computing machine, data collecting card, controllable silicon phase shift temperature control table, thyristor regulating depressor and voltage table; Described temperature controls/gathers dual-purpose thermopair and is arranged on exit, coal dust feed pipe lower end; Temperature controls/gathers dual-purpose thermopair and is connected to computing machine through data collecting card, and computing machine is provided with data logging software, and temperature controls/gathers dual-purpose thermopair and is connected to controllable silicon phase shift temperature control table simultaneously; Suspension body of heater monitoring thermopair is arranged on shower furnace body wall face, and suspension body of heater monitoring thermopair is connected to computing machine through data collecting card; Described thyristor regulating depressor is in parallel with body of heater high temperature resistance silk; Described voltage table is in parallel with body of heater high temperature resistance silk.
The insulation material of described heat gun insulation material and shower furnace sealing thermal insulation room is the fire-resistant blanket of polycrystalline mullite fibre.
Described ceramics pole is arranged on the axis of ceramic pipe by bracing frame.
Compared with prior art, the beneficial effect that possesses of the present invention:
The combustion characteristic analysis of spurting for the suspension in cement kiln using coal residing for coal dust under state, the static combustion analytical approach of more general thermogravimetric analysis more meets the fired state in cement coal.Under coal dust is in suspended dispersion, directly enter the middle burning of spurting that suspends at high operating temperatures, there is programming rate, heat transference efficiency, burning mass transfer velocity faster, thus the fired state more met in cement coal, and than thermogravimetric analysis process more fast, there is stronger differentiation distinguishing ability, the change procedure reflecting temperature in the combustion process of coal dust that can be good, than survey gas phase content, has more reference significance.Especially the analysis of the combustion characteristics of cement kiln coal dust is applicable to.Because the present invention is for programming rate not requirement, in contrast to general coal dust thermoanalysis technology, there is analysis ability more fast, when arrive needed for mensuration temperature and when reaching thermal equilibrium, only need the measurement and calculation that can complete testing sample for about 10 minutes, efficient and convenient, degree of accuracy is high, can also test continuously simultaneously, need not as thermogravimetric analysis, need equitemperature to be down to room temperature, a large amount of time can be saved.
Accompanying drawing explanation
Fig. 1 is the structural representation of cement kiln coal dust suspension combustion attribute testing stove of the present invention.
Fig. 2 is heat gun inner structure schematic diagram of the present invention.
Fig. 3 is the support frame structure schematic diagram in heat gun of the present invention.
Fig. 4 is body of heater heating system inner structure schematic diagram of the present invention.
Fig. 5 is the monitoring result that cement kiln coal dust suspension combustion attribute testing stove single test of the present invention obtains.
In figure: 1. air compressor, 2. the first reduction valve, 3. gas buffer tank, 4. the second reduction valve, 5. gas meter, 6. heat gun insulation material, 7. heat gun, 8. heat gun overheat protector thermopair, 9. heat gun wind-warm syndrome controls thermopair, 10. shower furnace sealing thermal insulation room, 11. heating tubes, 12. exhanst gas outlets, 13. temperature control/gather dual-purpose thermopair, 14. coal dust feed pipes, 15. gland bonnets, 16. suspension bodies of heater, 17. " L " shape quartz ampoule, 18. suspension body of heater monitoring thermopairs, 19. high temperature fix brick, 20. bracing frames, 21. high-temperature plastic gel materials, 22. heat gun high temperature resistance silks, 23. ceramics poles, 24. gas accesses, 26. ceramic pipes, 27. quartz glass tubes, 28. body of heater high temperature resistance silks, 29. gas vents.
Embodiment
Below by embodiment, technical scheme of the present invention is further elaborated.
Embodiment 1
Cement kiln coal dust suspension combustion attribute testing stove, comprises the monitoring of air supply system, heat gun 7, " L " shape quartz ampoule 17, body of heater heating system and shower furnace temperature and acquisition system;
Described air supply system comprises air compressor 1, first reduction valve 2, gas buffer tank 3, second reduction valve 4 and gas meter 5; The gas vent of described air compressor 1 is connected with the entrance of gas buffer tank 3 through the first reduction valve 2, and the outlet of gas buffer tank 3 is connected with gas meter 5 entrance through the second reduction valve 4;
Described heat gun 7 comprises ceramic pipe 26, high-temperature plastic gel material 21, gas access 24, gas vent 29, ceramics pole 23, bracing frame 20, heat gun high temperature resistance silk 22, heat gun overheat protector thermopair 8 and heat gun insulation material 6; Described ceramic pipe 26 one end is installed with gas access 24 by high-temperature plastic gel material 21 sealing, and gas access 24 exports with gas meter 5 and is connected; Ceramic pipe 26 other end is installed with gas vent 29 by high-temperature plastic gel material 21 sealing, and gas vent 29 is connected with the lower end air intake opening of " L " shape quartz ampoule 17; Ceramics pole 23 is arranged in ceramic pipe 26 by bracing frame 20, ceramics pole 23 is wound around and is provided with heat gun high temperature resistance silk 22; Heat gun overheat protector thermopair 8 is close to ceramic pipe 26 outside wall surface, and heat gun overheat protector thermopair 8 is connected with on/off temp controlled meter; Heat gun wind-warm syndrome control thermopair 9 is arranged on gas vent 29 and goes out, and heat gun wind-warm syndrome controls thermopair 9 and is connected with controllable silicon temp controlled meter; Heat gun insulation material 6 is wrapped in ceramic pipe 26 outside wall surface;
Described body of heater heating system comprises suspension body of heater 16, high temperature fixes brick 19, shower furnace sealing thermal insulation room 10, coal dust feed pipe 14, exhanst gas outlet 12; Suspension body of heater 16 is fixed brick 19 by high temperature and is fixed in shower furnace sealing thermal insulation room 10, suspension body of heater 16 lower end is connected with the gas outlet, upper end of " L " shape quartz ampoule 17, suspension body of heater 16 end face seals, coal dust feed pipe 14 is arranged in suspension body of heater 16 through suspension body of heater 16 end face, shower furnace sealing thermal insulation room 10 end face is stretched out in coal dust feed pipe 14 upper end, and porch, coal dust feed pipe 14 upper end is provided with gland bonnet; Suspension body of heater 16 is also provided with exhanst gas outlet 12, and exhanst gas outlet 12 stretches out outside shower furnace sealing thermal insulation room 10; Evenly be provided with heating tube 11 around suspension body of heater 16, heating tube 11 comprises quartz glass tube 27 and body of heater high temperature resistance silk 28, and body of heater high temperature resistance silk 28 is wrapped on quartz glass tube 27;
Described suspension body of heater 16 monitoring temperature and acquisition system comprise suspension body of heater monitoring thermopair 18, temperature controls/gather dual-purpose thermopair 13, computing machine, data collecting card, controllable silicon phase shift temperature control table, thyristor regulating depressor and voltage table; Described temperature controls/gathers dual-purpose thermopair 13 and is arranged on exit, coal dust feed pipe 14 lower end; Temperature controls/gathers dual-purpose thermopair 13 and is connected to computing machine through data collecting card, and computing machine is provided with data logging software, and temperature controls/gathers dual-purpose thermopair and is connected to controllable silicon phase shift temperature control table simultaneously; Suspension body of heater monitoring thermopair 18 is arranged on suspension body of heater 16 wall, and suspension body of heater monitoring thermopair 18 is connected to computing machine through data collecting card; Described thyristor regulating depressor is in parallel with body of heater high temperature resistance silk 28; Described voltage table is in parallel with body of heater high temperature resistance silk 28.
The insulation material of described heat gun insulation material 6 and shower furnace sealing thermal insulation room 10 is the fire-resistant blanket of polycrystalline mullite fibre.
Described ceramics pole 23 is arranged on by bracing frame 20 on the axis of ceramic pipe 26, ceramics pole 23 is wound around and is provided with heat gun high temperature resistance silk 22.
The course of work and principle:
1, air supply system
See Fig. 1, in experiment, air is forced into 0.8MPa through air compressor 1 compression, flow through reduction valve 2 again, when air pressure due to the gas-holder 3 of air compressor drops to below 0.4MPa, will again inflate until air pressure reaches 0.8MPa again, so in order to ensure the stable of air pressure and air mass flow, gas is through first reduction valve 2, and air pressure is down to 0.4MPa, be filled with in air buffer tank 3 to ensure the stable further of air pressure simultaneously.Then again by the valve on adjustment second gas pressure reducer 4 and gas meter 5, thus reach the object of stability contorting air pressure and air mass flow size.
The pressure of air and flow are adjusted to coal dust to be stably suspended in temperature and to control/gather, near dual-purpose thermopair 13, both will coal dust be caused because air quantity is excessive to be blown body of heater, also cannot can not suspend because air quantity is too small.
2, heat gun
See Fig. 2 and 3, ceramic pipe 26 outer wall of heat gun is enclosed with the fire-resistant blanket 6 of polycrystalline mullite fibre, prevents scattering and disappearing of heat.Seal the two ends of ceramic pipe 26 with high-temperature plastic gel material 21, ensure the impermeability of heat gun.The air that pressure and stability of flow are suitable for enters in heat gun 7 through gas meter 5 from gas access 24, required temperature is heated to through heat gun high temperature resistance silk 22, finally discharge from gas vent 29, and entered in suspension body of heater 16 by " L " shape quartz ampoule 17.By the preheating that heat gun carries out air, decrease the defect of suspension body of heater 16 internal cause type of heating and non-uniform phenomenon is arranged in the temperature field that causes.
Heat gun high temperature resistance silk 22 is connected with temperature of silicon controlled rectifier control table, by the control of temperature of silicon controlled rectifier control table, the air themperature of discharging from gas vent 29 stably can be controlled in required temperature.Simultaneously; the outer wall of heat gun is provided with heat gun overheat protector thermopair 8; heat gun overheat protector thermopair 8 is connected with on/off type temperature controller; once the temperature in heat gun is more than 900 DEG C; namely on/off type temperature controller can disconnect the power supply of heat gun automatically, and forms effective over-temperature protection.
The ceramics pole 23 being wound with heat gun high temperature resistance silk 22 is arranged on ceramic pipe on axis by bracing frame, improves the thermal efficiency, strengthens the inner gas heat interchange of heat gun, avoids high temperature resistance silk at high temperature simultaneously, the phenomenon of easily blowing because of gravity extruding.
3, body of heater heating system and shower furnace temperature are monitored and acquisition system
See Fig. 4, air is after the preheating of heat gun, suspension body of heater 16 is imported by " L " shape quartz ampoule 17, and through the further heating of body of heater high temperature resistance silk 28 that suspension body of heater 16 surrounding is arranged, air themperature controls/gathers by temperature the controllable silicon phase shift temperature control table that dual-purpose thermopair 13 connects and controls.
When the air themperature in suspension body of heater 16 reaches the temperature proportional band of testing requirements, controllable silicon phase shift temperature control table adjusts the output voltage of body of heater high temperature resistance silk 28 lentamente, the air themperature of suspension body of heater 16 is made to reach equilibrium point, be now a stationary value by the voltage of controllable silicon phase shift temperature control table Based Intelligent Control, write down corresponding magnitude of voltage, and disconnect controllable silicon phase shift temperature controller circuit, finally by the output voltage of silicon controlled rectifier voltage regulator adjustment body of heater high temperature resistance silk 28, ensure that whole system is in firm power and exports in test process, to ensure the accurately credible of test process.
The defining method whether temperature of suspension body of heater 16 reaches equilibrium state is as follows: if the temperature monitored at 15min inner suspension body of heater monitoring thermopair 18 does not change and temperature controls/gather the temperature variation Δ T<=1 DEG C that dual-purpose thermopair 13 monitors, then the temperature of suspension body of heater 16 reaches equilibrium state, can start to test.
See Fig. 5, when the air themperature in suspension body of heater 16 arrives after temperature equilibrium, open computing machine and corresponding data logging software, after working stability, open the gland bonnet of coal dust feed pipe 13, the coal dust simultaneously dropped into, then quick gland bonnet to be closed.When the heat discharged by coal dust firing dispels the heat complete gradually, when the air themperature in suspension body of heater 16 enters equilibrium state again, data can be preserved.
Controlled by temperature and gather dual-purpose thermopair 13 to gather coal dust temperature delta data in time in combustion process under suspended state, draw coal dust suspension combustion temperature change curve in time, according to the heating power characteristic of curve evaluation coal dust.
Claims (3)
1. cement kiln coal dust suspension combustion attribute testing stove, is characterized in that, comprises air supply system, heat gun, " L " shape quartz ampoule, body of heater heating system, the monitoring of shower furnace temperature and acquisition system;
Described air supply system comprises air compressor, the first reduction valve, gas buffer tank, the second reduction valve and gas meter; The outlet of described air compressor is connected through the entrance of the first reduction valve with gas buffer tank, and the outlet of gas buffer tank is connected with gas meter entrance through the second reduction valve;
Described heat gun comprises ceramic pipe, high-temperature plastic gel material, gas access, gas vent, ceramics pole, bracing frame, heat gun high temperature resistance silk, heat gun overheat protector thermopair and heat gun insulation material; Described ceramic pipe one end is installed with gas access by the sealing of high-temperature plastic gel material, and gas access exports with gas meter and is connected; The ceramic pipe other end is installed with gas vent by the sealing of high-temperature plastic gel material, and gas vent is connected with the lower end air intake opening of " L " shape quartz ampoule; Ceramics pole is arranged in ceramic pipe by bracing frame, ceramics pole is wound around and is provided with heat gun high temperature resistance silk; Heat gun overheat protector thermopair is close to ceramic pipe outside wall surface, and heat gun overheat protector thermopair is connected with on/off temp controlled meter; Heat gun wind-warm syndrome control thermopair is arranged on gas vent and goes out, and heat gun wind-warm syndrome controls thermopair and is connected with controllable silicon temp controlled meter; Heat gun insulation material is wrapped in ceramic pipe outside wall surface;
Described body of heater heating system comprises suspension body of heater, high temperature fixes brick, shower furnace sealing thermal insulation room, coal dust feed pipe and exhanst gas outlet; Suspension body of heater is fixed brick by high temperature and is fixed in shower furnace sealing thermal insulation room, suspension body of heater lower end is connected with the gas outlet, upper end of " L " shape quartz ampoule, suspension body of heater end face seals, coal dust feed pipe is arranged in suspension body of heater through suspension body of heater end face, shower furnace sealing thermal insulation room end face is stretched out in coal dust feed pipe upper end, and porch, coal dust feed pipe upper end is provided with gland bonnet; Suspension body of heater is also provided with exhanst gas outlet, and it is outdoor that exhanst gas outlet stretches out shower furnace sealing thermal insulation; Evenly be provided with heating tube around suspension body of heater, heating tube comprises quartz glass tube and body of heater high temperature resistance silk, and body of heater high temperature resistance silk is wrapped on quartz glass tube;
Described shower furnace temperature monitoring and acquisition system comprise suspension body of heater monitoring thermopair, temperature controls/gather dual-purpose thermopair, computing machine, data collecting card, controllable silicon phase shift temperature control table, thyristor regulating depressor and voltage table; Described temperature controls/gathers dual-purpose thermopair and is arranged on exit, coal dust feed pipe lower end; Temperature controls/gathers dual-purpose thermopair and is connected to computing machine through data collecting card, and computing machine is provided with data logging software, and temperature controls/gathers dual-purpose thermopair and is connected to controllable silicon phase shift temperature control table simultaneously; Suspension body of heater monitoring thermopair is arranged on shower furnace body wall face, and suspension body of heater monitoring thermopair is connected to computing machine through data collecting card; Described thyristor regulating depressor is in parallel with body of heater high temperature resistance silk; Described voltage table is in parallel with body of heater high temperature resistance silk.
2. cement kiln coal dust suspension combustion attribute testing stove as claimed in claim 1, it is characterized in that, the insulation material of described heat gun insulation material and shower furnace sealing thermal insulation room is the fire-resistant blanket of polycrystalline mullite fibre.
3. cement kiln coal dust suspension combustion attribute testing stove as claimed in claim 1, it is characterized in that, described ceramics pole is arranged on the axis of ceramic pipe by bracing frame.
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| CN110057867A (en) * | 2019-04-18 | 2019-07-26 | 广西大学 | A kind of suspended state thermal analysis test device and test method |
| CN111579589A (en) * | 2020-05-13 | 2020-08-25 | 华东理工大学 | Device for collecting particle combustion image and using method |
| CN112180026A (en) * | 2020-09-18 | 2021-01-05 | 太原理工大学 | Experimental system and analysis method for low-concentration combustible waste gas and fire coal co-combustion |
| CN114324466A (en) * | 2021-11-19 | 2022-04-12 | 上海仪器仪表自控系统检验测试所有限公司 | Nuclear power equipment hydrogen explosion availability verification test device and method |
| US11740196B2 (en) | 2020-07-29 | 2023-08-29 | Henan Agricultural University | Multifunctional biomass suspension deflagration test-bed |
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| CN110057867A (en) * | 2019-04-18 | 2019-07-26 | 广西大学 | A kind of suspended state thermal analysis test device and test method |
| CN110057867B (en) * | 2019-04-18 | 2024-01-12 | 广西大学 | Suspended state thermal analysis test device and test method |
| CN111579589A (en) * | 2020-05-13 | 2020-08-25 | 华东理工大学 | Device for collecting particle combustion image and using method |
| US11740196B2 (en) | 2020-07-29 | 2023-08-29 | Henan Agricultural University | Multifunctional biomass suspension deflagration test-bed |
| CN112180026A (en) * | 2020-09-18 | 2021-01-05 | 太原理工大学 | Experimental system and analysis method for low-concentration combustible waste gas and fire coal co-combustion |
| CN114324466A (en) * | 2021-11-19 | 2022-04-12 | 上海仪器仪表自控系统检验测试所有限公司 | Nuclear power equipment hydrogen explosion availability verification test device and method |
| CN114324466B (en) * | 2021-11-19 | 2024-01-12 | 上海仪器仪表自控系统检验测试所有限公司 | Nuclear power equipment hydrogen explosion availability verification test device and method |
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