CN111608740A

CN111608740A - Clinker production line driving system and method utilizing waste heat boiler steam

Info

Publication number: CN111608740A
Application number: CN202010425451.5A
Authority: CN
Inventors: 袁亮国; 李大雪
Original assignee: Beijing Strong Innovation Technology Co ltd
Current assignee: Beijing Strong Innovation Technology Co ltd
Priority date: 2020-05-19
Filing date: 2020-05-19
Publication date: 2020-09-01

Abstract

The invention discloses a clinker production line driving system and method by using waste heat boiler steam, when the waste heat boiler is not started and no steam is generated, a steam turbine is separated from a motor by a clutch of the steam turbine, and the motor is used for driving a high-temperature fan to operate independently; when the turbine reaches rated power to enable a clutch of the turbine to be closed, the turbine, the motor and the high-temperature fan rotate at the same speed; judging whether the output power of the steam turbine reaches the rated power of the high-temperature fan or not, and when the output power of the steam turbine reaches the rated power of the high-temperature fan, independently driving the high-temperature fan to operate by using the steam turbine; when the steam quantity is insufficient, the steam turbine and the motor are adopted to drive the high-temperature fan in a dual-drive mode, the power difference between the high-temperature fan and the steam turbine is judged, and power compensation is conducted on the high-temperature fan according to the working current of the motor adjusted according to the power difference. The invention realizes comprehensive utilization of surplus steam, achieves the aims of energy saving and stable production, reduces energy loss and improves energy efficiency.

Description

Clinker production line driving system and method utilizing waste heat boiler steam

Technical Field

The embodiment of the invention relates to the technical field of cement production, in particular to a clinker production line driving system and method utilizing waste heat boiler steam.

Background

Cement is a basic raw material of national economy, and the cement will be a main building material of human society for a long time in the future. The cement industry is an intensive industry of technology, fund, resource and energy, along with the rapid development of economic construction, the cement industry brings unprecedented activity of the civil construction industry, and the construction of basic facilities such as roads, bridges, railways, airports, hydraulic buildings, near-shore structures, city construction, communication and the like, so that the quantity of building materials reaches the unprecedented level in history.

The cement clinker is prepared with limestone, clay and iron material as main material and through mixing in proper proportion to form raw material, burning to melt partially or completely and cooling to obtain semi-finished product. The high-temperature fan is a power source of a closed system of a cement plant. In the existing clinker production line, a motor is usually adopted to directly drive a high-temperature fan to operate as a power source, although the power source generates electricity by means of waste heat, heat energy is converted into high-temperature high-pressure water vapor through a boiler, the high-temperature high-pressure water vapor is converted into rotary mechanical energy of a rotor through a steam turbine, the mechanical energy is converted into electric energy through a generator, the energy loss in the middle is large, the energy conversion efficiency is low, the production line is poor in operation stability, and the normal operation of the clinker production line is influenced.

In the design of the existing cement production line, the transformer capacity of the total voltage reduction station is considered to be overlarge. The method comprises the steps of mining crushing, raw material conveying, raw material preparation, coal powder preparation, clinker sintering and the like, wherein the normal power utilization capacity of all power utilization equipment of a cement grinding factory-leaving system is obtained, the capacity surplus caused by self power generation after the normal operation of a waste heat power generation system is not considered, or the capacity design is not dared to be reduced due to the fact that no effective measure is taken for dealing with the abnormal operation condition of a production line although the capacity surplus is considered.

In actual operation, waste heat power generation becomes standard allocation of all cement clinker production lines, and waste heat power generation system equipment is designed to be used at one time, and the actual effective operation rate of the clinker production line reaches 100 percent. When the clinker self-generating capacity can meet the clinker self-power consumption, the capacity of a transformer of a total voltage reduction station of the cement production line can be obtained without considering a sintering system, and only a cement preparation system needs to be considered. The implementation of directly dragging a high-power fan by combining the steam of the waste heat boiler realizes that the zero electricity purchase of a clinker sintering system has complete feasibility.

Disclosure of Invention

Therefore, the embodiment of the invention provides a clinker production line driving system and method using waste heat boiler steam, which realize comprehensive utilization of the waste heat boiler residual steam, achieve the purposes of energy saving and stable production and ensure the normal production operation of a clinker production line.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: a clinker production line driving system utilizing waste heat boiler steam comprises a waste heat boiler, a steam turbine, a first coupler, a speed reducer, a hydraulic coupler, a motor, a second coupler and a high-temperature fan, wherein the waste heat boiler is connected with a steam pipeline; the steam turbine is connected with the waste heat boiler through the steam pipeline, a power shaft of the steam turbine is connected with a first shaft body of the speed reducer through the first coupling, a second shaft body of the speed reducer is connected with a torque input shaft of the hydraulic coupler, a torque output shaft of the hydraulic coupler is connected with a power input shaft of the motor, and the power output shaft of the motor is connected with a fan shaft of the high-temperature fan through the second coupling.

As the optimal scheme of the clinker production line driving system utilizing the steam of the waste heat boiler, the clinker production line driving system further comprises a high-pressure heater, a water feeding pump and a deaerator, wherein the waste heat boiler is connected with the high-pressure heater through a water feeding pipeline, and the high-pressure heater is connected with the deaerator through the water feeding pump.

The optimal scheme of the clinker production line driving system utilizing waste heat boiler steam further comprises a low-pressure heater, a condensate pump and a condenser, wherein the water outlet end of the low-pressure heater is connected with the deaerator through a water conveying pipeline, the water inlet end of the low-pressure heater is connected with the water outlet end of the condensate pump through a water conveying pipeline, the water inlet end of the condensate pump is connected with the water outlet end of the condenser through a water conveying pipeline, and the inlet of the condenser is connected with the steam turbine.

The optimized scheme of the clinker production line driving system utilizing the waste heat boiler steam further comprises a supply pipeline, wherein a water chemical treatment device is arranged on the supply pipeline and connected with the deaerator.

As a preferred scheme of a clinker production line driving system utilizing waste heat boiler steam, the water chemical treatment device comprises a cleaning unit, an ultrafiltration unit, a reverse osmosis unit and an electric desalting unit, wherein the cleaning unit, the ultrafiltration unit, the reverse osmosis unit and the electric desalting unit are sequentially connected through a water pipeline.

The embodiment of the invention also provides a clinker production line driving method by using the steam of the waste heat boiler, which comprises the following steps:

before the start of the waste heat boiler: when the waste heat boiler is not started and no steam is generated, the steam turbine is separated from the motor through a clutch of the steam turbine, and the motor is used for driving the high-temperature fan to operate independently;

when the waste heat boiler operates: when the turbine reaches rated power to enable a clutch of the turbine to be closed, the turbine, the motor and the high-temperature fan rotate at the same speed; judging whether the output power of the steam turbine reaches the rated power of the high-temperature fan or not, and when the output power of the steam turbine reaches the rated power of the high-temperature fan, independently driving the high-temperature fan to operate by using the steam turbine;

when the steam quantity is insufficient: the method comprises the steps of adopting a steam turbine and a motor to carry out dual drive on the high-temperature fan, judging the power difference between the high-temperature fan and the steam turbine, and carrying out power compensation on the high-temperature fan according to the working current of the motor regulated by the power difference.

As a preferable scheme of the clinker production line driving method by using the waste heat boiler steam, when the output power of the steam turbine reaches the rated power of the high-temperature fan, the steam turbine is used for driving the high-temperature fan to operate independently and keeping the motor idle.

As a preferable scheme of the clinker production line driving method by utilizing the steam of the waste heat boiler, when the steam quantity is insufficient, the rotating speed of the motor is adjusted by the frequency converter so that the rotating speed of the high-temperature fan meets the electric load of the clinker production line.

As the optimal scheme of the clinker production line driving method by utilizing the steam of the waste heat boiler, when the steam turbine fails, a motor is adopted to drive the high-temperature fan independently; when the motor breaks down, the high-temperature fan is driven by the steam turbine independently.

The preferable scheme of the clinker production line driving method by utilizing the waste heat boiler steam is used for a 5000T/D clinker production line.

In the embodiment of the invention, a steam turbine is connected with a waste heat boiler through a steam pipeline, a power shaft of the steam turbine is connected with a first shaft body of a speed reducer through a first coupling, a second shaft body of the speed reducer is connected with a torque input shaft of a hydraulic coupler, a torque output shaft of the hydraulic coupler is connected with a power input shaft of a motor, and the power output shaft of the motor is connected with a fan shaft of a high-temperature fan through a second coupling. When the waste heat boiler is not started and no steam is generated, the steam turbine is separated from the motor through a clutch of the steam turbine, and the motor is used for driving the high-temperature fan to operate independently; when the turbine reaches rated power to enable a clutch of the turbine to be closed, the turbine, the motor and the high-temperature fan rotate at the same speed; judging whether the output power of the steam turbine reaches the rated power of the high-temperature fan or not, and when the output power of the steam turbine reaches the rated power of the high-temperature fan, independently driving the high-temperature fan to operate by using the steam turbine; when the steam quantity is insufficient, the steam turbine and the motor are adopted to drive the high-temperature fan in a dual-drive mode, the power difference between the high-temperature fan and the steam turbine is judged, and power compensation is conducted on the high-temperature fan according to the working current of the motor adjusted according to the power difference. Any problem of the steam turbine and the motor can be mutually replaced and compensated, the normal production operation of a clinker line is not influenced, the comprehensive utilization of surplus steam is realized, the purposes of energy conservation and stable production are achieved, the energy loss is reduced, and the energy efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

FIG. 1 is a schematic diagram of a clinker production line driving system using exhaust-heat boiler steam provided in an embodiment of the present invention.

FIG. 2 is a schematic diagram of a clinker production line driving method using exhaust-heat boiler steam according to an embodiment of the present invention.

In the figure: 1. a waste heat boiler; 2. a steam line; 3. a steam turbine; 4. a first coupling; 5. a speed reducer; 6. a fluid coupling; 7. an electric motor; 8. a second coupling; 9. a high temperature fan; 10. a high pressure heater; 11. a feed pump; 12. a deaerator; 13. a low pressure heater; 14. a condensate pump; 15. a condenser; 16. a water chemistry processing device.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a clinker production line driving system using exhaust-heat boiler steam is provided, which includes an exhaust-heat boiler 1, the exhaust-heat boiler 1 is connected with a steam pipeline 2, and further includes a steam turbine 3, a first coupling 4, a speed reducer 5, a fluid coupling 6, a motor 7, a second coupling 8 and a high temperature fan 9; the steam turbine 3 is connected with the waste heat boiler 1 through the steam pipeline 2, a power shaft of the steam turbine 3 is connected with a first shaft body of the speed reducer 5 through the first coupling 4, a second shaft body of the speed reducer 5 is connected with a torque input shaft of the hydraulic coupler 6, a torque output shaft of the hydraulic coupler 6 is connected with a power input shaft of the motor 7, and a power output shaft of the motor 7 is connected with a fan shaft of the high-temperature fan 9 through the second coupling 8.

In one embodiment of the clinker production line driving system utilizing waste heat boiler steam, the clinker production line driving system further comprises a high-pressure heater 10, a water feeding pump 11 and a deaerator 12, wherein the waste heat boiler 1 is connected with the high-pressure heater 10 through a water feeding pipeline, and the high-pressure heater 10 is connected with the deaerator 12 through the water feeding pump 11. The low-pressure steam turbine is characterized by further comprising a low-pressure heater 13, a condensate pump 14 and a condenser 15, wherein the water outlet end of the low-pressure heater 13 is connected with the deaerator 12 through a water conveying pipeline, the water inlet end of the low-pressure heater 13 is connected with the water outlet end of the condensate pump 14 through a water conveying pipeline, the water inlet end of the condensate pump 14 is connected with the water outlet end of the condenser 15 through a water conveying pipeline, and the inlet of the condenser 15 is connected with the steam turbine 3. The device also comprises a supply pipeline, wherein a water chemistry treatment device 16 is arranged on the supply pipeline, and the water chemistry treatment device 16 is connected with the deaerator 12. Specifically, the water chemistry treatment device 16 comprises a cleaning unit, an ultrafiltration unit, a reverse osmosis unit and an electric desalting unit, wherein the cleaning unit, the ultrafiltration unit, the reverse osmosis unit and the electric desalting unit are sequentially connected through a water pipeline.

In particular, the cleaning unit can adopt irrigation water, and solid particles with the particle size larger than the gap of the sieve tube in the irrigation water are blocked on the inner wall of the sieve tube. When the silt is accumulated to a certain degree, the pressure difference of the water inlet and the water outlet is increased, when the preset pressure difference is reached, the pressure difference controller sends a switching signal, the electric blow-down valve is opened, the transmission mechanism drives the sewage suction device to rotate, the inner cavities of the sieve tubes are sequentially washed by water flow from outside to inside through the sewage suction disc, and the dirty water is discharged from the sewage outlet. Along with the clearance of filth, the pressure differential after straining reduces gradually before straining, when falling to the lower limit of setting for the pressure differential, and the differential pressure controller signals once more, and electronic blowoff valve and main rotating electrical machines close, and the blow off pipe is closed, and the blowdown process finishes.

Specifically, the ultrafiltration unit uses pressure as the membrane separation process of driving force, and can intercept particles and impurities with the diameter of 0.002-0.1 μm through the micropore screening on the surface of the membrane, and can effectively remove colloids, silicon, proteins, microorganisms and macromolecular organic matters in water.

Specifically, because the water required by the high-pressure boiler and the sub-high-pressure boiler is high-purity water and needs to be subjected to desalination treatment, the main purpose of reverse osmosis is to pre-desalinate, and 99% of sodium ions, calcium, magnesium and other impurities in the water are filtered out.

Specifically, the electric desalting unit combines an ion exchange membrane technology and an ion electromigration technology, can produce ultrapure water with the resistivity as high as 18 MOmega cm, can continuously discharge water, does not need acid-base regeneration, has stable water quality of discharged water, has less energy consumption of modules, saves the operating cost, is easy to realize integral module arrangement, and has light weight and compact structure.

Specifically, a rotary film deaerator can be adopted, water supplement is sprayed out in a spiral shape through a film drawing pipe according to a certain angle to exchange heat with heating steam to deaerate, feed water is heated to a saturation temperature corresponding to the working pressure of the deaerator, oxygen and other gases dissolved in the feed water are removed, and corrosion of auxiliary equipment such as a feed pipe of the waste heat boiler 1 is prevented and reduced.

Referring to fig. 2, an embodiment of the present invention further provides a clinker production line driving method using exhaust-heat boiler steam, including the following steps:

before the start of the waste heat boiler 1: when the waste heat boiler 1 is not started and no steam is generated, the steam turbine 3 is separated from the motor 7 through a clutch of the steam turbine 3, and the motor 7 is used for driving the high-temperature fan 9 to operate independently;

when the waste heat boiler 1 is in operation: when the steam turbine 3 reaches rated power to enable a clutch of the steam turbine 3 to be closed, the steam turbine 3, the motor 7 and the high-temperature fan 9 rotate at the same speed; judging whether the output power of the steam turbine 3 reaches the rated power of the high-temperature fan 9 or not, and when the output power of the steam turbine 3 reaches the rated power of the high-temperature fan 9, independently driving the high-temperature fan 9 to operate by using the steam turbine 3;

when the steam quantity is insufficient: the method comprises the steps of adopting the steam turbine 3 and the motor 7 to drive the high-temperature fan 9 in a dual mode, judging the power difference between the high-temperature fan 9 and the steam turbine 3, and carrying out power compensation on the high-temperature fan 9 according to the working current of the motor 7 regulated by the power difference.

Specifically, when the output power of the steam turbine 3 reaches the rated power of the high temperature fan 9, the steam turbine 3 is used to drive the high temperature fan 9 alone and keep the motor 7 idle. When the steam quantity is insufficient, the rotating speed of the motor 7 is adjusted through the frequency converter, so that the rotating speed of the high-temperature fan 9 meets the electrical load of the clinker production line. When the steam turbine 3 breaks down, the motor 7 is adopted to drive the high-temperature fan 9 independently; when the motor 7 fails, the high temperature fan 9 is driven by the steam turbine 3 alone.

Specifically, taking a 5000T/D clinker production line as an example:

the running power of a motor (model: YKK 800-62600 kw 10kv) of the existing high-temperature fan is 2000 kw/h; based on the technical scheme of the invention, the output shaft is required to be returned to a manufacturer for modification, and then the output shaft is modified into a double output shaft;

a 2.5MW steam turbine, and a matched oil system, a vacuum system (5.5KW), a condensing system and the like are additionally arranged;

a hydraulic coupler and a speed reducer are added;

two condensate pumps (11KW) and two circulating water pumps (75KW) are added;

a newly added steam pipeline and a circulating water pipeline are merged into the existing main steam main pipe and a circulating jellyfish pipe network;

transforming an electric system and a DCS system;

the existing motor high-voltage frequency conversion system interlocking and protection system is improved.

In the current cement production line, the average per ton clinker power consumption level is about 46-47kwh/t, the per ton clinker waste heat generation level can reach 33-35kwh/t, the advanced level is higher, and even reaches over 38kwh/t of per ton clinker waste heat generation. The difference between the electricity consumption of the clinker per ton and the waste heat power generation of the clinker per ton is about 12 kwh/t. Namely, as long as the difference value of 12kwh/t is supplemented, a complete cement production line can realize zero electricity purchase from a mine, raw materials to a clinker firing system except a cement grinding system.

Based on the purpose, the existing cement production line is improved by the measures for reducing the electricity consumption:

firstly, a low-resistance electric bag composite dust collector is used for saving electricity, the pressure difference between the dust collectors at the head and the tail of the kiln is respectively reduced by 25 percent and 150 percent in the same ratio, the power consumption of a motor is reduced by 158kw, and the power consumption of clinker is reduced by 0.69 kwh/t.

Secondly, the mine stone breaking adopts a heavy hammer type crusher, and due to the adoption of a shed strip structure, the installed power is reduced by one time, the electricity is saved by 280.00kw, and the comprehensive power consumption of clinker is reduced by 1.22 kwh/t.

And thirdly, the permanent magnet motor is applied to equipment with higher rotating speed, such as a fan, a powder concentrator, a belt conveyor, a lifter and the like. As the efficiency of the permanent magnet motor is 4-16% higher than that of an asynchronous motor, electricity is saved by 680.00kw, and the comprehensive power consumption of clinker is reduced by 2.97 kwh/t.

Fourthly, the high-efficiency energy-saving fan is applied to a large fan, a grate cooler fan and the like. The high-efficiency fan energy-saving technology has a remarkable effect of improving the operating efficiency of the fan, the field operating efficiency is usually not lower than 80%, and the electricity-saving rate of the fan energy-saving project which is technically improved is usually not lower than 15%. The electricity is saved by 850.00kw, and the comprehensive power consumption of the clinker is reduced by 3.71 kwh/t.

And fifthly, the Roots blower is changed into a magnetic suspension blower, and the field operation efficiency of the magnetic suspension blower is compared with that of the Roots blower, and the magnetic suspension blower saves electricity by 30 percent. The electricity is saved by 87.60kw, and the comprehensive power consumption of the clinker is reduced by 0.38 kwh/t.

The improvement of measures for improving the generating capacity of the existing cement production line is as follows:

firstly, the steam of the waste heat boiler is adopted to directly drive the high-power high-temperature fan. Because the energy conversion is reduced twice, the energy loss caused by the conversion efficiency is avoided, the energy efficiency is improved by 15 percent, and the cost for passing the network is saved. Electricity is saved by 592.50kw, and the power generation amount of clinker per ton is improved by 2.59 kwh/t.

Secondly, the waste heat of the kiln cylinder is recycled efficiently. The surface temperature of the cylinder of a 5000t/d production line phi 5X61m rotary kiln is 350 ℃, 4 groups of heat conducting sheet type heat exchange covers are arranged on the kiln, hot water is used for heating waste heat power generation raw water, the raw water is expected to be improved by 15 ℃, the generated energy can be improved by 185 thousands kw all the year after the raw water is softened and used for power generation, and the generated energy of clinker per ton is comprehensively calculated and improved by 1.22 kwh/t.

Thirdly, after the generated energy and the power consumption of the clinker system are balanced, the capacity of a transformer of a total voltage reduction station can be obtained without considering a sintering system in a complete cement production line, and only a cement preparation system needs to be considered. The cost of a transformer (18000kva) is saved, electricity is saved by 158.00kw, and the electricity generation per ton of clinker is improved by 0.69 kwh/t. While saving the basic capacity cost.

Fourthly, the technology of recycling mixed waste air at about 90 degrees behind a kiln head AQC furnace for cooling air of a grate cooler is adopted to improve the generating capacity, the waste heat generating capacity can be improved by more than 12 percent, and the generating capacity of clinker per ton is improved by 4.5 kwh/t.

Fifthly, the waste heat power generation system is improved, and the power generation amount of clinker per ton is improved by 0.68 kwh/t.

And sixthly, the coal mill system is arranged at the tail of the kiln, and kiln tail waste gas is used as a drying heat source, so that kiln head waste gas is saved for power generation, the power generation capacity of a kiln head boiler is correspondingly improved, and the power generation capacity per ton of clinker can be improved by 3.16 kwh/t.

After the measures are taken, the power consumption can be reduced by 8.97kwh/t, the power generation can be improved by 12.83kwh/t, and the total power consumption is 21.8 kwh/t. The difference of 12kwh/t between the electricity consumption of the clinker per ton and the waste heat power generation of the clinker per ton is far greater. Namely, the power consumption of the clinker per ton is reduced to be below 40kwh/t, the waste heat power generation of the clinker per ton is more than 40kwh/t, the balance of self power utilization and power generation is realized, and zero power purchase of a clinker firing system can be completely realized.

Specifically, the specific operation mode in production operation based on the technical scheme of the invention is as follows:

the first clinker line production operation stage:

before the clinker production line runs, the waste heat power generation system is not started, and no self-generating energy can be used for starting the firing system. During the period, the cement preparation system stops running (the procedures of delivering goods and the like which use less electricity can not be influenced and run as usual), and a general pressure reduction station which is normally used for the cement preparation system transmits the external electricity to the burning system to be used as a starting operation power supply of the rotary kiln system. According to the process steps from ignition kiln drying temperature rise to air drawing feeding, related equipment is started gradually and sequentially according to working conditions from primary air fuel conveying, and the electric load of the rotary kiln system gradually reaches full load operation from a small amount of electric power. During the period, the waste heat utilization system is also started for the first time according to the temperature of the flue gas. The steam quantity generated by the SP furnace can reach more than one thousand degrees of generated energy per hour only within a period of time when the system is not started to draw wind before feeding. The part of generated energy is already put into the system for power utilization before the rotary kiln system draws wind and feeds.

Secondly, feeding clinker on a line to a normal operation stage:

after the system draws wind and feeds materials, steam generating capacity generated by the SP furnace is gradually increased until clinker enters a kiln head cooler for heat exchange, the AQC furnace performs normal heat exchange and performs furnace power generation, and the generating capacity of the waste heat power generation system is gradually increased to a normal value. Meanwhile, the steam of the other set of system waste heat boiler for waste heat utilization directly drags the high-power high-temperature fan to be started after the system draws air and feeds materials.

In the process, the outsourcing power consumption is gradually reduced along with the gradual increase of the power generation amount. Before the process of the raw material preparation system is not included, the electric load of the rotary kiln system accounts for about half of that of a clinker system and is far lower than the operation load of a cement preparation system. The outsourcing can be quitted as soon as the generated energy reaches a normal value.

If the raw material stock is less, the raw material preparation system is put into operation after the rotary kiln system is required to be fed, and the external power purchase can be quitted later until the generated energy and the power consumption are balanced. In the period, the cement preparation system can timely start corresponding equipment for storage, feeding, cement shipment and the like until the whole system is started according to the power consumption condition of the clinker system.

Third, the power generation amount fluctuation period:

some fluctuation may occur in the operation of the clinker system, and the fluctuation of the working condition can directly influence the power generation amount. At the moment, the double-power-driven high-power high-temperature fan system with the steam turbine and the motor plays a role of an energy storage pool. When the fluctuation reduces the generated energy to be not enough to balance the electrical load of the clinker system, external electricity is introduced, and the high-power high-temperature fans such as the high-temperature fan, the circulating fan and the like are adjusted by the motor through the frequency converter to meet the requirement of normal production and use until the steam dragging is continuously withdrawn. Of course, the generated energy is further reduced within a certain period of time, and the working condition can be adjusted by reducing the load of the mine raw material system or the raw material preparation system until the working condition and the generated energy are normal. And after the steam is surplus, the steam dragging systems of the high-power high-temperature fans are put into self-power generation to be used in the cement system. The zero electricity purchasing is realized in a clinker firing system, the self-generating electricity is used in the whole cement production line, and the use of high-price external electricity purchasing is reduced or avoided as much as possible.

Fourthly, adopting a production and power distribution operation mode:

even under the condition that the clinker system does not completely realize the balance of the generated energy and the power consumption at the present stage, according to the operation mode, the capacity of the transformer of the total voltage reduction station can be greatly reduced in a complete cement production line, so that the investment and the operating cost are reduced.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A clinker production line driving system utilizing waste heat boiler steam comprises a waste heat boiler (1), wherein the waste heat boiler (1) is connected with a steam pipeline (2), and is characterized by further comprising a steam turbine (3), a first coupler (4), a speed reducer (5), a hydraulic coupler (6), a motor (7), a second coupler (8) and a high-temperature fan (9); the waste heat boiler (1) is connected through the steam pipeline (2) to the steam turbine (3), the power shaft of the steam turbine (3) is connected through the first coupling (4) to the first shaft body of the speed reducer (5), the second shaft body of the speed reducer (5) is connected to the torque input shaft of the hydraulic coupler (6), the torque output shaft of the hydraulic coupler (6) is connected to the power input shaft of the motor (7), and the power output shaft of the motor (7) is connected through the second coupling (8) to the fan shaft of the high-temperature fan (9).

2. A clinker production line driving system using exhaust-heat boiler steam according to claim 1, characterized in that it further comprises a high-pressure heater (10), a water feeding pump (11) and a deaerator (12), the exhaust-heat boiler (1) is connected with the high-pressure heater (10) through a water feeding pipeline, and the high-pressure heater (10) is connected with the deaerator (12) through the water feeding pump (11).

3. The clinker production line driving system utilizing waste heat boiler steam as claimed in claim 2, further comprising a low-pressure heater (13), a condensate pump (14) and a condenser (15), wherein a water outlet end of the low-pressure heater (13) is connected with the deaerator (12) through a water pipeline, a water inlet end of the low-pressure heater (13) is connected with a water outlet end of the condensate pump (14) through a water pipeline, a water inlet end of the condensate pump (14) is connected with a water outlet end of the condenser (15) through a water pipeline, and an inlet of the condenser (15) is connected with the steam turbine (3).

4. A clinker production line drive system using exhaust-heat boiler steam according to claim 2, characterized in that it further comprises a supply line, said supply line is provided with a water chemical treatment device (16), said water chemical treatment device (16) is connected with said deaerator (12).

5. A clinker production line driving system using exhaust-heat boiler steam according to claim 4, characterized in that said water chemical treatment device (16) comprises a cleaning unit, an ultrafiltration unit, a reverse osmosis unit and an electric desalting unit, and said cleaning unit, ultrafiltration unit, reverse osmosis unit and electric desalting unit are connected in sequence via water pipes.

6. A clinker production line driving method utilizing waste heat boiler steam is characterized by comprising the following steps:

before the start of the waste heat boiler (1): when the waste heat boiler (1) is not started and no steam is generated, the steam turbine (3) is separated from the motor (7) through a clutch of the steam turbine (3), and the motor (7) is used for driving the high-temperature fan (9) to operate independently;

when the waste heat boiler (1) is in operation: when the steam turbine (3) reaches rated power to enable a clutch of the steam turbine (3) to be sucked, the steam turbine (3), the motor (7) and the high-temperature fan (9) rotate at the same speed; judging whether the output power of the steam turbine (3) reaches the rated power of the high-temperature fan (9), and when the output power of the steam turbine (3) reaches the rated power of the high-temperature fan (9), independently driving the high-temperature fan (9) to operate by using the steam turbine (3);

when the steam quantity is insufficient: the method comprises the steps of adopting a steam turbine (3) and a motor (7) to drive a high-temperature fan (9) in a dual-drive mode, judging the power difference between the high-temperature fan (9) and the steam turbine (3), and carrying out power compensation on the high-temperature fan (9) according to the working current of the motor (7) regulated by the power difference.

7. A clinker line driving method using exhaust-heat boiler steam according to claim 6, characterized in that when the output power of the steam turbine (3) reaches the rated power of the high temperature fan (9), the steam turbine (3) is used to drive the high temperature fan (9) to operate alone and keep the motor (7) idle.

8. The method for driving the clinker production line by using the steam of the exhaust-heat boiler according to claim 6, characterized in that when the steam quantity is insufficient, the rotating speed of the motor (7) is adjusted by the frequency converter to make the rotating speed of the high-temperature fan (9) meet the electrical load of the clinker production line.

9. A clinker production line driving method using exhaust-heat boiler steam according to claim 6 characterized in that, when the steam turbine (3) is out of order, the high temperature fan (9) is driven by the electric motor (7) alone; when the motor (7) breaks down, the steam turbine (3) is adopted to drive the high-temperature fan (9) independently.

10. A clinker line drive method using exhaust-heat boiler steam according to claim 6, characterized in that it is used for 5000T/D clinker line.