CN104949520A - Method for power generation by high-efficient using cement kiln waste heat - Google Patents
Method for power generation by high-efficient using cement kiln waste heat Download PDFInfo
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- CN104949520A CN104949520A CN201410119962.9A CN201410119962A CN104949520A CN 104949520 A CN104949520 A CN 104949520A CN 201410119962 A CN201410119962 A CN 201410119962A CN 104949520 A CN104949520 A CN 104949520A
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- steam
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- pressure steam
- heat boiler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
- Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention provides a method for power generation by high-efficient using cement kiln waste heat and belongs to the technical field of cement kiln waste heat utilization energy saving and emission reduction. The used systems of the method comprise a kiln head AQC waste heat boiler, a kiln tail SP waste heat boiler, a tertiary air duct steam superheater and a steam turbine generator unit. Compared with the prior art, the difference is that the steam superheater is arranged on a tertiary air duct outside a waste heat boiler body. Through the arrangement of the external steam superheater, the pressure and the temperature of steam are improved, therefore, the power generation amount every ton of the steam is improved, accordingly, the heat utilization rate of the steam is improved, the power generation efficiency of the steam is improved from the original about 14% to about 23%, and the remarkable energy saving effect and economic benefits are brought. Meanwhile, the temperature of the tertiary air is also reduced and stabilized, the service life of an air duct gate valve is prolonged, the maintenance and replacement cost of the air duct gate valve is reduced, and the long-period stable operation of a cement production system is facilitated.
Description
Technical field:
The present invention relates to a kind of cement industry cement kiln UTILIZATION OF VESIDUAL HEAT IN energy-conserving and emission-cutting technology scheme, be exactly utilize clinker to fire the most efficiently to generate electricity with the waste heat in cooling procedure, increase generated energy specifically, reach the object of energy-saving and emission-reduction.
Background technology:
The measure of present cement kiln waste heat recovery: one is the useless flue gas (temperature is about 360 DEG C) of being discharged by kiln tail preheater, sends into SP waste heat boiler and produces 2.5MPa, the middle pressure steam of about 300 DEG C.Kiln hood cold gas (temperature is about 340 DEG C), sends into AQC waste heat boiler and produces 2.5MPa, the middle pressure steam of 300 DEG C and 0.25MPa, the low-pressure steam of about 150 DEG C.Use gas compensating type steam turbine power generation, the steam of 2.5MPa does main steam, and the steam of 0.25MPa does tonifying Qi.Under this parameter, generating efficiency only has about 14%, and its shortcoming is that the quality of steam is low, and generating efficiency is low.
Summary of the invention:
The object of the invention is to overcome above shortcoming, a kind of method improving exhaust heat utilization effect of cement kiln is provided, by improving the pressure and temperature of institute's producing steam, the heat utilization efficiency of generated energy, steam and energy-saving effect being improved.
The method of a kind of efficiency utilization cement kiln residual heat generating provided by the invention, be the steam thus the method for increase generated energy that utilize in clinker cooling procedure the overheated waste heat boiler of the high warm air produced to produce, it is provided with steam superheater in tertiary-air pipe.
Middle pressure steam kiln hood waste heat boiler and kiln tail waste heat boiler produced is arranged in the middle pressure steam superheater in tertiary-air pipe by pipeline feeding, after overheated, sends into Turbo-generator Set generating.Concrete raising parameter is as follows.
Produce middle pressure steam pressure bring up to 3.5-3.82MPa, temperature brings up to 430 DEG C-450 DEG C.
The thermal source sending into kiln hood waste heat boiler is the cement kiln lingering remnants of past customs of 300 DEG C-380 DEG C, and the thermal source sending into kiln tail waste heat boiler is the flue gas of 320 DEG C-400 DEG C.
The low-pressure steam simultaneously produced by kiln hood waste heat boiler is arranged in the low-pressure steam superheater in tertiary-air pipe by pipeline feeding, after overheated, sends into Turbo-generator Set generating as tonifying Qi.Concrete raising parameter is as follows.
Produce low-pressure steam pressure bring up to 0.4-0.6MPa, temperature brings up to 250 DEG C-270 DEG C.
In addition, in order to prevent vapor (steam) temperature from exceeding scope of design, superheater arranges spray desuperheating device.
The present invention, by being provided with the pressure and temperature that steam superheater improves institute's producing steam safely and effectively in tertiary-air pipe, makes the heat utilization efficiency of generated energy, steam and energy-saving effect be improved.
Detailed description of the invention:
Below by specific embodiment, the present invention will be further described.
The cement producing line of an existing daily output 2500 tons, kiln hood cooler leading portion produce temperature 1000 DEG C-1300 DEG C high warm air be used as cement kiln combustion air as Secondary Air, stage casing produce 800 DEG C-1000 DEG C high warm air send dore furnace to be used as combustion air as tertiary air, all the other air temperatures are about 300 DEG C-350 DEG C and send kiln hood AQC boiler, produce 3.82MPa, the middle pressure steam of about 275 DEG C and 0.485MPa, the low-pressure steam of about 150 DEG C.Kiln exit gas temperature is about 320 DEG C-380 DEG C, selects SP boiler, and boiler produces 3.82MPa, the middle pressure steam of about 275 DEG C, and flue-gas temperature about 210 DEG C discharged by boiler, for drying raw material.By kiln hood stove and kiln tail stove produce middle pressure steam mixing after send into and be located in tertiary-air pipe and press in superheater, kiln hood produce in low-pressure steam sends into and be arranged in tertiary-air pipe low-pressure superheater, middle pressure steam is superheated to about 450 DEG C, after low-pressure steam is superheated to about 250 DEG C, middle pressure steam is as main steam, and low-pressure steam sends into Turbo-generator Set generating as tonifying Qi.Superheater arranges spray desuperheating device, ensures that vapor (steam) temperature is no more than design temperature scope, simultaneously also in order to avoid superheater is burned because of overtemperature of tube wall.In order to ensure that entering kiln head boiler wind-warm syndrome is not less than 300 DEG C, according to cooler temperature of outgoing air, adjustment is automatically carried out to the cooling air quantity entering cooler low temperature section.When waste heat boiler overhauls, flue gas enters air through chimney after directly entering sack cleaner dedusting by bypass duct, and in order to protect sack cleaner not to be burned, spray desuperheating before flue gas enters deduster, makes flue-gas temperature drop to less than 150 DEG C.
The medium-pressure boiler of 3.82MPa selected by the main steam waste heat boiler of this embodiment, temperature of steaming is about about 275 DEG C, tertiary-air pipe arranges steam superheater, make the steam of 275 DEG C be superheated to about 450 DEG C, simultaneously by kiln hood AQC boiler to produce pressure be that the low-pressure steam of 0.485MPa is superheated to about 250 DEG C.Superheater arranges spray desuperheating device, ensures that vapor (steam) temperature is no more than design temperature scope, simultaneously also in order to avoid superheater is burned because of overtemperature of tube wall.Because of the raising of vapor (steam) temperature and pressure, generating efficiency is improved greatly, reaches the object of energy-saving and emission-reduction.
Main steam pressure brings up to about 3.82MPa, and temperature brings up to 450 DEG C; Superfeed pressure brings up to about 0.485MPa, and temperature brings up to about 250 DEG C, thus improves generated energy, and the heat utilization efficiency of such steam has just brought up to about 23% from about 14%, and generating efficiency is original more than 1.67 times, and energy-saving effect significantly improves.
Make a concrete analysis of beneficial effect of the present invention below: by improving the pressure and temperature of steam, thus improve the enthalpy of steam: the enthalpy of 2.5MPa, 300 DEG C of steam is 725Kcal/Kg, 3.82MPa, the enthalpy of 450 DEG C of steam is 795Kcal/Kg, when generator pressure at expulsion is 0.005MPa, when temperature is 50 DEG C, the enthalpy of steam discharge is 620Kcal/Kg, transformation is front is 105Kcal/Kg for the enthalpy generated electricity, enthalpy for generating electricity after transformation is 175Kcal/Kg, and improved like this generated energy is original 1.67 times.For 2500t/d cement produced with the dry method, waste heat boiler steam production is about 24t/h, generated energy is about 3000KW/h, after transformation, generated energy is about 5000KW/h, and electricity price is by 0.5 yuan/degree, then benefit increases by 1000 yuan/hour, and be the heat improving steam enthalpy many consumption be (70 × 24 × 1000) 1680000Kcal, if the caloric value of bituminous coal presses 5800Kcal/Kg calculating; The coal-fired thermal efficiency calculates by 90%, then need many consumption bituminous coal 322Kg/h, coal price is by 600 yuan/ton of calculating, then the cost burning coal increase per hour is 193 yuan more, pure benefit hourly is like this (1000-193) 807 yuan, running time in unit year by 7500 hours calculate, then: year improve effects be 6,050,000 yuan.The generated energy of ton cement is from original 28.8 degree, and bring up to 48.1 degree, the investment payback time has dropped to about 2.5 years, considerable benefit by about original 4 years.
Claims (7)
1. a method for efficiency utilization cement kiln residual heat generating, is utilize cement kiln to fire the method producing steam-electric power with the heat smoke that produces in cooling procedure, it is characterized in that: in tertiary-air pipe, be provided with steam superheater.
2. the method for a kind of efficiency utilization cement kiln residual heat generating according to claim 1, it is characterized in that: middle pressure steam kiln hood waste heat boiler and kiln tail waste heat boiler produced is arranged in the middle pressure steam superheater in tertiary-air pipe by pipeline feeding, is generated electricity by overheated rear feeding Turbo-generator Set.
3. the method for a kind of efficiency utilization cement kiln residual heat generating according to claim 2, is characterized in that: waste heat boiler produce middle pressure steam pressure be 3.5-3.82MPa, temperature is 250 DEG C-300 DEG C.
4. the method for a kind of efficiency utilization cement kiln residual heat generating according to claim 2, is characterized in that: described middle pressure steam is superheated to 430 DEG C-450 DEG C.
5. the method for a kind of efficiency utilization cement kiln residual heat generating according to claim 2, it is characterized in that: also comprise the low-pressure steam produced by kiln hood waste heat boiler and be arranged in the low-pressure steam superheater in tertiary-air pipe by pipeline feeding, after overheated, send into Turbo-generator Set generating as tonifying Qi.
6. the method for a kind of efficiency utilization cement kiln residual heat generating according to claim 5, is characterized in that: waste heat boiler produce low-pressure steam pressure be 0.4-0.6MPa, temperature is 130 DEG C-170 DEG C.
7. the method for a kind of efficiency utilization cement kiln residual heat generating according to claim 5, is characterized in that: described low-pressure steam is superheated to 250 DEG C-270 DEG C.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410119962.9A CN104949520A (en) | 2014-03-28 | 2014-03-28 | Method for power generation by high-efficient using cement kiln waste heat |
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| CN201410119962.9A CN104949520A (en) | 2014-03-28 | 2014-03-28 | Method for power generation by high-efficient using cement kiln waste heat |
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| CN104949520A true CN104949520A (en) | 2015-09-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776916A (en) * | 2016-03-13 | 2016-07-20 | 石家庄新华能源环保科技股份有限公司 | Low-carbon-emission cement production device |
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- 2014-03-28 CN CN201410119962.9A patent/CN104949520A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105776916A (en) * | 2016-03-13 | 2016-07-20 | 石家庄新华能源环保科技股份有限公司 | Low-carbon-emission cement production device |
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Application publication date: 20150930 |