CN102393148B - Cement kiln tail by-pass waste heat power generation device - Google Patents
Cement kiln tail by-pass waste heat power generation device Download PDFInfo
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- CN102393148B CN102393148B CN2011103500797A CN201110350079A CN102393148B CN 102393148 B CN102393148 B CN 102393148B CN 2011103500797 A CN2011103500797 A CN 2011103500797A CN 201110350079 A CN201110350079 A CN 201110350079A CN 102393148 B CN102393148 B CN 102393148B
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Abstract
The invention provides a cement kiln tail by-pass waste heat power generation device which is mainly characterized in that: in the existing pure middle and low temperature waste heat power generation system for a cement kiln, a cement kiln tail by-pass waste heat power generation mechanism is additionally arranged, i.e. another smoke outlet of a rotary kiln tail smoke room is connected with a smoke inlet of a by-pass waste heat boiler shell, and a smoke outlet of the by-pass waste heat boiler shell is connected with a chimney through a dust collector and a draught fan. A water inlet of an economizer of a by-pass waste heat boiler is connected with a water outlet of a deaerator, a water outlet of the economizer is connected with an inlet of a steam drum of an evaporator, a steam outlet of the steam drum of the evaporator is connected with a steam inlet of a superheater, and a steam outlet of the superheater is connected with a steam inlet of a steam turbine. The device provided by the invention not only can fully utilize the heat generated by cement kiln tail by-pass operation so as to increase the waste heat power generation capacity, but also can improve the quality of cement products.
Description
Technical field
The present invention relates to a kind of device for generating power by waste heat, particularly utilize the device of cement kiln residual heat generating technique.
Background technology
In cement production process, in former, fuel, potassium, sodium, chlorine, sulphur are that can new dry process rotary kiln steady production and affect the disturbing factor of cement product quality, its excessive existence easily causes that skinning, obstruction appear in kiln tail or preheater, affects the normal operation of firing system.After excessive potassium, sodium, chlorine, sulphur composition enter grog and make cement, alkali easily occurring on the one hand, shortens concrete service life; Reinforcing bar on the other hand also can corrosion concrete, affect its mechanism's intensity.
Domestic current most enterprises adopt the high-quality crude fuel of low alkali, chlorinity to guarantee the normal operation of cement clinker production line and the quality of cement products.But, along with day being becoming tight of former, fuel source, using the high standard clinker of higher former, the low alkali of fuel production, low chlorine containing potassium, sodium, chlorine, sulfur content is the certainty of cement industry development; And, along with developing rapidly of the contour science and technology of high ferro, more and more higher to the engineering construction quality requirement, the high standard clinker production technology of low alkali, low chlorine has become the task of top priority of China's cement industry.
Adopting the bypass technology is the effective measures that solve the harmful constituent circulation, reduce harmful constituent content in grog.
Existing cement kiln pure middle and low temperature device for generating power by waste heat, its structure is mainly: the exhanst gas outlet of rotary kiln tail smoke-box is connected with the preheater gas approach consisted of some cyclone cylinders, the exhanst gas outlet of this preheater is connected with the gas approach of kiln tail waste heat boiler, and the exhanst gas outlet of this kiln tail waste heat boiler is connected with raw mill, dust-precipitator and coal mill by air-introduced machine.The uppermost exhanst gas outlet of preheater also is connected with raw mill, dust-precipitator and coal mill by another pipeline.The grate-cooler of dividing into air-cooler is separately arranged, an one exhanst gas outlet is connected with kiln hood independence superheater gas approach by dust-precipitator, this kiln hood independence superheater exhanst gas outlet is connected with the kiln hood waste heat boiler gas approach, this kiln hood waste heat boiler gas approach also is connected with another exhanst gas outlet of grate-cooler, this kiln hood waste heat boiler exhanst gas outlet can be connected with grate-cooler afterbody air inlet, also can with chimney or grate-cooler, be connected by dust-precipitator and air-introduced machine.Condensate tank is connected with oxygen-eliminating device by water pump.Delivery port of this oxygen-eliminating device is connected with the low-pressure coal saver water inlet of above-mentioned kiln tail waste heat boiler bottom, the outlet of this low-pressure coal saver is connected with low-pressure drum, low-pressure drum is connected with the low pressure evaporator section with down-comer by tedge again and forms loop, the steam (vapor) outlet of low-pressure drum is connected with the import of this boiler low-pressure superheater, and the outlet of this low-pressure superheater is connected with the import of steam turbine auxiliary steam.Above-mentioned oxygen-eliminating device delivery port also is connected with the low-pressure coal saver water inlet of kiln hood waste heat boiler bottom, the outlet of this low-pressure coal saver is connected with low-pressure drum, low-pressure drum is connected with the low pressure evaporator section with down-comer by tedge again and forms loop, the steam (vapor) outlet of low-pressure drum is connected with the import of low-pressure superheater, and the outlet of this low-pressure superheater is connected with the import of steam turbine auxiliary steam.Another delivery port of oxygen-eliminating device is connected with the low pressure hot water section water inlet of kiln hood waste heat boiler bottom, the delivery port of this kiln hood waste heat boiler low pressure hot water section is connected with kiln tail waste heat boiler time middle pressure economizer import, in this time, press economizer exit to be connected with time middle drum of pressing of kiln tail waste heat boiler, inferior middle pressure drum is connected and forms loop with this boiler time middle pressure evaporator section with down-comer by tedge again, in this time, press the steam (vapor) outlet of drum to be connected with this kiln tail waste heat boiler time middle superheater steam inlet of pressing, this superheater steam (vapor) outlet is connected with the C2 superheater import in being arranged on C2 level preheater, the outlet of C2 superheater is connected with the steam turbine steam inlet.The delivery port of this kiln hood waste heat boiler low pressure hot water section also presses the import of economizer to be connected with the inferior middle of this kiln hood waste heat boiler, in this time, press the outlet of economizer to be connected with time middle drum of pressing of kiln hood waste heat boiler, in this time, press drum to be connected and to form loop with this boiler time middle pressure evaporator section with down-comer by tedge again, in this time, press the steam (vapor) outlet of drum to be connected with the import of kiln hood independence superheater, this kiln hood independence superheater steam (vapor) outlet is connected with the steam turbine steam inlet.Above-mentioned exhaust steam in steam turbine outlet is connected with the condenser medium inlet, and this condenser media outlet is connected with condensate tank by condensate pump.
Its weak point is: this structure is only to utilize the final 250-400 ℃ of waste gas residual heat of discharging of preheater produce steam and utilize it to be generated electricity by the SP waste heat boiler.Even if at the inner C2 superheater that increases of the C2 of preheater level cyclone cylinder, the 20-25 ℃ of temperature difference utilizing C2 level cyclone cylinder inner core to manufacture of cement in 450-600 ℃ of waste gas of C1 level cyclone cylinder entrance to allow will the SP waste heat boiler produces steam and introduces further heating in the C2 superheater, due to the restriction that is subject to EGT, the steam pressure and the temperature parameter that produce are lower, fail cement kiln waste gas cogeneration ability is given full play to.
Summary of the invention
The object of the present invention is to provide a kind of heat that can not only take full advantage of the cement kiln tail bypass wind discharging generation, increase the cogeneration amount, but also can improve the device for generating power by waste heat with cement kiln tail bypass wind discharging of cement product quality.
The present invention is mainly in existing cement kiln pure middle and low temperature afterheat generating system, increases cement kiln tail bypass wind discharging cogeneration mechanism, and it mainly comprises tail bypass wind discharging exhaust-heat boiler and the pipeline, air-introduced machine, dust-precipitator and the chimney that are attached thereto.Wherein, another exhanst gas outlet of rotary kiln tail smoke-box is connected with the mouth that advances of tail bypass wind discharging exhaust-heat boiler housing by the high-temp waste gas pipeline, and its outlet flue is connected with chimney by dust-precipitator and air-introduced machine.This tail bypass wind discharging exhaust-heat boiler is provided with economizer, evaporimeter and superheater from bottom to top successively, wherein the water inlet of economizer is connected with the oxygen-eliminating device delivery port, this economizer delivery port is connected with drum, this drum is connected with evaporimeter with down-comer by tedge and forms loop, the steam (vapor) outlet of this drum is connected with the superheater steam inlet, and the steam (vapor) outlet of this superheater is connected with steam turbine steam air intake.
Other parts of the present invention are substantially same as the prior art, the exhanst gas outlet that is rotary kiln tail smoke-box is connected with the preheater gas approach consisted of some cyclone cylinders, the exhanst gas outlet of this preheater is connected with the gas approach of kiln tail waste heat boiler, and the exhanst gas outlet of this kiln tail waste heat boiler is connected with raw mill, dust-precipitator and coal mill by air-introduced machine.The uppermost exhanst gas outlet of preheater also is connected with raw mill, dust-precipitator and coal mill by another pipeline.The grate-cooler of dividing into air-cooler is separately arranged, an one exhanst gas outlet is connected with kiln hood independence superheater gas approach by dust-precipitator, this kiln hood independence superheater exhanst gas outlet is connected with the kiln hood waste heat boiler gas approach, this kiln hood waste heat boiler gas approach also is connected with another exhanst gas outlet of grate-cooler, this kiln hood waste heat boiler exhanst gas outlet can be connected with grate-cooler afterbody air inlet, also can be by dust-precipitator and air-introduced machine and chimney.Condensate tank is connected with oxygen-eliminating device by water pump.Delivery port of this oxygen-eliminating device is connected with the low-pressure coal saver water inlet of above-mentioned kiln tail waste heat boiler bottom, the outlet of this low-pressure coal saver is connected with low-pressure drum, low-pressure drum is connected with the low pressure evaporator section with down-comer by tedge again and forms loop, the steam (vapor) outlet of low-pressure drum is connected with the import of this boiler low-pressure superheater, and the outlet of this low-pressure superheater is connected with the import of steam turbine auxiliary steam.Above-mentioned oxygen-eliminating device delivery port also is connected with the low-pressure coal saver water inlet of kiln hood waste heat boiler bottom, the outlet of this low-pressure coal saver is connected with low-pressure drum, low-pressure drum is connected with the low pressure evaporator section with down-comer by tedge again and forms loop, the steam (vapor) outlet of low-pressure drum is connected with the import of low-pressure superheater, and the outlet of this low-pressure superheater is connected with the import of steam turbine auxiliary steam.Another delivery port of oxygen-eliminating device is connected with the low pressure hot water section water inlet of kiln hood waste heat boiler bottom, the delivery port of this kiln hood waste heat boiler low pressure hot water section is connected with kiln tail waste heat boiler time middle pressure economizer import, in this time, press economizer exit to be connected with time middle drum of pressing of kiln tail waste heat boiler, inferior middle pressure drum is connected and forms loop with this boiler time middle pressure evaporator section with down-comer by tedge again, in this time, press the steam (vapor) outlet of drum to be connected with this kiln tail waste heat boiler time middle superheater steam inlet of pressing, this superheater steam (vapor) outlet is connected with the C2 superheater import in being arranged on C2 level preheater, the outlet of C2 superheater is connected with the steam turbine steam inlet.The delivery port of this kiln hood waste heat boiler low pressure hot water section also presses the import of economizer to be connected with the inferior middle of this kiln hood waste heat boiler, in this time, press the outlet of economizer to be connected with time middle drum of pressing of kiln hood waste heat boiler, in this time, press drum to be connected and to form loop with this boiler time middle pressure evaporator section with down-comer by tedge again, in this time, press the steam (vapor) outlet of drum to be connected with the import of kiln hood independence superheater, this kiln hood independence superheater steam (vapor) outlet is connected with the steam turbine steam inlet.Above-mentioned exhaust steam in steam turbine outlet is connected with the condenser medium inlet, and this condenser media outlet is connected with condensate tank by condensate pump.
The course of work of the present invention is: thermal source of the present invention is not only taken from the grate-cooler, kiln tail preheater of kiln hood but also is taken from kiln tail smoke-box bypass flue gas.This bypass flue gas is extracted out from rotary kiln smoke-box top, be delivered to and carry out heat exchange in tail bypass wind discharging exhaust-heat boiler and dirt falls, flue-gas temperature is reduced to 160 ℃ by 1000 ℃, thereby make sylvite, sodium salt separate out and discharge with dust, and the objectionable impurities such as chlorine, sulphur enter cyclone dust collectors with 160 ℃ of bypass flue gases, be incorporated to again in original production system flue gas, enter in chimney through air-introduced machine; Flue gas and water heat exchange also produce superheated steam, and this steam can be incorporated in cement kiln waste-heat power generation system and be used for pushing turbine generating.
The present invention compared with prior art has following advantage:
1, the present invention has effectively utilized the waste heat in the bypass flue gas, improves cement product quality, has reduced the hear rate of grog.With 2500t/d cement kiln production line, 10% bypass amount is example: adopt original bypass technology, while the bypass waste heat not being reclaimed, the hear rate of grog is 3300KJ/Kg; After adopting the present invention, the hear rate of grog is reduced to 3174KJ/Kg.
2, the present invention can increase the Waste Heat Power Station generated energy.With 2500t/d cement kiln production line, 10% bypass amount is example: the high-temperature flue gas that utilizes bypass, reasonably design boiler structure, uniform distribution air current composition, can produce flow 13.56t/h, 380 ℃ of superheated steams of temperature, the discharge temperature of smoke gas flow after each heat-transfer surface drops to 160 ℃, can realize cogeneration amount 2 ~ 2.5Mw.
3, cancelled the cold wind blower fan, reduced the power of tail exhaust blower, reduced and provide power consumption for oneself.With 2500t/d cement kiln production line, 10% bypass amount is example: in the harmful components that guarantee to enter the kiln raw material in allowed limits, these bypass gas of extracting out are mixed with cold wind, while being reduced to 220 ℃ of left and right, need cold blast rate 175000m3/h.If adopt traditional bypass technique, need to increase the air-introduced machine that a typhoon amount is 175000m3/h, simultaneously due to the introducing of cold wind, increased the air quantity of bypass tail exhaust blower, so the necessary corresponding choosing of the model of tail exhaust blower is large, these all can cause the loss of personal electric power.Carry out exchange heat and adopt technique of the present invention that the bypass flue gas is directly introduced to tail bypass wind discharging exhaust-heat boiler, produce steam, therefore can cancel the cold wind blower fan, also can reduce the power of tail exhaust blower simultaneously.
The accompanying drawing explanation
Fig. 1 is flow process simplified schematic diagram of the present invention.
Fig. 2 is the local simplified schematic diagram of amplifying of kiln tail tail bypass wind discharging exhaust-heat boiler of the present invention.
Attached number in the figure explanation
1-rotary kiln, 2-kiln tail smoke-box, 3-preheater, 4-kiln tail waste heat boiler, 5-air-introduced machine, 6-steam turbine, 7-generator, 8-kiln tail tail bypass wind discharging exhaust-heat boiler, 9-condensate pump, 10-condensate tank, 11-oxygen-eliminating device, 12-boiler feed pump, 13-condenser, 14-dust-precipitator, 15-chimney, 16-high-temp waste gas pipeline, 17-C2 superheater, 18-grate-cooler
19-kiln hood waste heat boiler, 20-kiln hood independence superheater.
The specific embodiment
In the simplified schematic diagram of a kind of device for generating power by waste heat with cement kiln tail bypass wind discharging shown in Fig. 1 and Fig. 2, the exhanst gas outlet of rotary kiln tail smoke-box is connected with the preheater gas approach consisted of some cyclone cylinders, the exhanst gas outlet of this preheater is connected with the gas approach of kiln tail waste heat boiler, and the exhanst gas outlet of this kiln tail waste heat boiler is connected with raw mill, dust-precipitator and coal mill by air-introduced machine.The uppermost exhanst gas outlet of preheater also is connected with raw mill, dust-precipitator and coal mill by another pipeline.The grate-cooler of dividing into air-cooler is separately arranged, an one exhanst gas outlet is connected with kiln hood independence superheater gas approach by dust-precipitator, this kiln hood independence superheater exhanst gas outlet is connected with the kiln hood waste heat boiler gas approach, this kiln hood waste heat boiler gas approach also is connected with another exhanst gas outlet of grate-cooler, this kiln hood waste heat boiler exhanst gas outlet can be connected with grate-cooler afterbody air inlet, also can with chimney or grate-cooler, be connected by dust-precipitator and air-introduced machine.Condensate tank is connected with oxygen-eliminating device by water pump.Delivery port of this oxygen-eliminating device is connected with the low-pressure coal saver water inlet of above-mentioned kiln tail waste heat boiler bottom, the outlet of this low-pressure coal saver is connected with low-pressure drum, low-pressure drum is connected with the low pressure evaporator section with down-comer by tedge again and forms loop, the steam (vapor) outlet of low-pressure drum is connected with the import of this boiler low-pressure superheater, and the outlet of this low-pressure superheater is connected with the import of steam turbine auxiliary steam.Above-mentioned oxygen-eliminating device delivery port also is connected with the low-pressure coal saver water inlet of kiln hood waste heat boiler bottom, the outlet of this low-pressure coal saver is connected with low-pressure drum, low-pressure drum is connected with the low pressure evaporator section with down-comer by tedge again and forms loop, the steam (vapor) outlet of low-pressure drum is connected with the import of low-pressure superheater, and the outlet of this low-pressure superheater is connected with the import of steam turbine auxiliary steam.Another delivery port of oxygen-eliminating device is connected with the low pressure hot water section water inlet of kiln hood waste heat boiler bottom, the delivery port of this kiln hood waste heat boiler low pressure hot water section is connected with kiln tail waste heat boiler time middle pressure economizer import, in this time, press economizer exit to be connected with time middle drum of pressing of kiln tail waste heat boiler, inferior middle pressure drum is connected and forms loop with this boiler time middle pressure evaporator section with down-comer by tedge again, in this time, press the steam (vapor) outlet of drum to be connected with this kiln tail waste heat boiler time middle superheater steam inlet of pressing, this superheater steam (vapor) outlet is connected with the C2 superheater import in being arranged on C2 level preheater, the outlet of C2 superheater is connected with the steam turbine steam inlet.The delivery port of this kiln hood waste heat boiler low pressure hot water section also presses the import of economizer to be connected with the inferior middle of this kiln hood waste heat boiler, in this time, press the outlet of economizer to be connected with time middle drum of pressing of kiln hood waste heat boiler, in this time, press drum to be connected and to form loop with this boiler time middle pressure evaporator section with down-comer by tedge again, in this time, press the steam (vapor) outlet of drum to be connected with the import of kiln hood independence superheater, this kiln hood independence superheater steam (vapor) outlet is connected with the steam turbine steam inlet.Above-mentioned exhaust steam in steam turbine outlet is connected with the condenser medium inlet, and this condenser media outlet is connected with condensate tank by condensate pump.
Another exhanst gas outlet of rotary kiln tail smoke-box is connected with the mouth that advances of tail bypass wind discharging exhaust-heat boiler housing by the high-temp waste gas pipeline, and its outlet flue is connected with chimney by dust-precipitator and air-introduced machine.This tail bypass wind discharging exhaust-heat boiler is provided with economizer, evaporimeter and superheater from bottom to top successively, wherein the water inlet of economizer is connected with the oxygen-eliminating device delivery port, this economizer delivery port is connected with drum, this drum is connected with evaporimeter with down-comer by tedge and forms loop, the steam (vapor) outlet of this drum is connected with the superheater steam inlet, and the steam (vapor) outlet of this superheater is connected with steam turbine steam air intake.
Claims (1)
1. the device for generating power by waste heat with cement kiln tail bypass wind discharging, it is characterized in that: the exhanst gas outlet of rotary kiln tail smoke-box is connected with the preheater gas approach consisted of cyclone cylinder, the exhanst gas outlet of this preheater is connected with the gas approach of kiln tail waste heat boiler, the exhanst gas outlet of this kiln tail waste heat boiler is by air-introduced machine and raw mill, dust-precipitator and coal mill are connected, the uppermost exhanst gas outlet of preheater is also by another pipeline and raw mill, dust-precipitator and coal mill are connected, the grate-cooler of dividing into air-cooler is separately arranged, an one exhanst gas outlet is connected with kiln hood independence superheater gas approach by dust-precipitator, this kiln hood independence superheater exhanst gas outlet is connected with the kiln hood waste heat boiler gas approach, this kiln hood waste heat boiler gas approach also is connected with another exhanst gas outlet of grate-cooler, this kiln hood waste heat boiler exhanst gas outlet can be connected with grate-cooler afterbody air inlet, also can with chimney or grate-cooler, be connected by dust-precipitator and air-introduced machine, condensate tank is connected with oxygen-eliminating device by water pump, delivery port of this oxygen-eliminating device is connected with the low-pressure coal saver water inlet of above-mentioned kiln tail waste heat boiler bottom, the outlet of this low-pressure coal saver is connected with low-pressure drum, low-pressure drum is connected with the low pressure evaporator section with down-comer by tedge again and forms loop, the steam (vapor) outlet of low-pressure drum is connected with the import of this boiler low-pressure superheater, the outlet of this low-pressure superheater is connected with the import of steam turbine auxiliary steam, above-mentioned oxygen-eliminating device delivery port also is connected with the low-pressure coal saver water inlet of kiln hood waste heat boiler bottom, the outlet of this low-pressure coal saver is connected with low-pressure drum, low-pressure drum is connected with the low pressure evaporator section with down-comer by tedge again and forms loop, the steam (vapor) outlet of low-pressure drum is connected with the import of low-pressure superheater, the outlet of this low-pressure superheater is connected with the import of steam turbine auxiliary steam, another delivery port of oxygen-eliminating device is connected with the low pressure hot water section water inlet of kiln hood waste heat boiler bottom, the delivery port of this kiln hood waste heat boiler low pressure hot water section is connected with kiln tail waste heat boiler time middle pressure economizer import, in this time, press economizer exit to be connected with time middle drum of pressing of kiln tail waste heat boiler, inferior middle pressure drum is connected and forms loop with this boiler time middle pressure evaporator section with down-comer by tedge again, in this time, press the steam (vapor) outlet of drum to be connected with this kiln tail waste heat boiler time middle superheater steam inlet of pressing, this superheater steam (vapor) outlet is connected with the C2 superheater import in being arranged on C2 level preheater, the outlet of C2 superheater is connected with the steam turbine steam inlet, the delivery port of this kiln hood waste heat boiler low pressure hot water section also presses the import of economizer to be connected with the inferior middle of this kiln hood waste heat boiler, in this time, press the outlet of economizer to be connected with time middle drum of pressing of kiln hood waste heat boiler, in this time, press drum to be connected and to form loop with this boiler time middle pressure evaporator section with down-comer by tedge again, in this time, press the steam (vapor) outlet of drum to be connected with the import of kiln hood independence superheater, this kiln hood independence superheater steam (vapor) outlet is connected with the steam turbine steam inlet, above-mentioned exhaust steam in steam turbine outlet is connected with the condenser medium inlet, this condenser media outlet is connected with condensate tank by condensate pump, another exhanst gas outlet of rotary kiln tail smoke-box is connected with the mouth that advances of tail bypass wind discharging exhaust-heat boiler housing by the high-temp waste gas pipeline, its outlet flue is connected with chimney by dust-precipitator and air-introduced machine, this tail bypass wind discharging exhaust-heat boiler is provided with economizer from bottom to top successively, evaporimeter and superheater, wherein the water inlet of economizer is connected with the oxygen-eliminating device delivery port, this economizer delivery port is connected with drum, this drum is connected with evaporimeter with down-comer by tedge and forms loop, the steam (vapor) outlet of this drum is connected with the superheater steam inlet, the steam (vapor) outlet of this superheater is connected with steam turbine steam air intake.
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| CN103557712A (en) * | 2013-11-06 | 2014-02-05 | 杨义军 | Bypass snorting afterheat recovering system for novel dry process cement kiln afterheat power station |
| CN104048500A (en) * | 2014-06-28 | 2014-09-17 | 陈霍旺 | Kiln head waste heat generating system of dry method rotary kiln device |
| CN104197301B (en) * | 2014-08-29 | 2016-05-11 | 安徽海螺川崎节能设备制造有限公司 | Cement kiln exhaust heat recovery power generation bypass boiler |
| CN104390472B (en) * | 2014-09-26 | 2016-06-08 | 上海激光电源设备有限责任公司 | Low temperature exhaust heat boiler is adopted to carry out hardening and tempering method and the modifying device of electric precipitation flue gas |
| CN108800961A (en) * | 2018-06-29 | 2018-11-13 | 天津健威泽节能环保科技股份有限公司 | Kiln cylinder body steam heat-exchanging system and implementation method for the low pressure filling of cement kiln power station |
| CN110906749A (en) * | 2019-11-04 | 2020-03-24 | 安徽海螺建材设计研究院有限责任公司 | Novel dry-process clinker production line efficient waste heat power generation system and waste heat utilization method |
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