CN214836592U - Cement kiln waste heat utilization system of cement plant self-contained power station - Google Patents
Cement kiln waste heat utilization system of cement plant self-contained power station Download PDFInfo
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- CN214836592U CN214836592U CN202120595687.3U CN202120595687U CN214836592U CN 214836592 U CN214836592 U CN 214836592U CN 202120595687 U CN202120595687 U CN 202120595687U CN 214836592 U CN214836592 U CN 214836592U
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Abstract
The utility model discloses a cement plant is from power plant cement kiln waste heat utilization system, exhaust-heat boiler and cement kiln burn till the headtotail, retrieves the cement kiln waste heat, and the power plant condensate pump sends the condensate water into exhaust-heat boiler low temperature section heating, sends to the deaerator deoxidization after, sends to exhaust-heat boiler high temperature section heating again through the boiler feed water pump after the deoxidization, sends to coal fired boiler as boiler feed water at last. When the utility model is provided with the self-contained power station on the cement line, the waste heat can be more reasonably and efficiently utilized in a cascade way according to the matching of the thermodynamic system parameters of the power station and the waste heat parameters, the overall power generation efficiency is improved, the coal consumption is reduced, the investment is saved, and the green benefit is improved; the utility model utilizes the waste heat of the cement kiln to replace a steam extraction and heat regeneration system of a steam turbine of a coal-fired power station, and reduces the steam extraction of the steam turbine, thereby improving the efficiency of the steam turbine and reducing the coal consumption; the utility model discloses do not set up waste heat power generation steam turbine, generator and auxiliary system alone, investment such as can sparingly equipment, civil engineering.
Description
Technical Field
The utility model relates to a cement manufacture line waste heat recovery, especially a cement plant is from having power station cement kiln waste heat utilization system.
Background
As a large power consumption household, a cement plant needs to be matched with a self-contained power station in a cement plant in the face of large power consumption in areas with relatively weak power facilities and power grids or countries. According to the electricity load condition of the cement plant, the self-contained power station of the cement plant generally adopts a coal-fired circulating fluidized bed and a pure condensing turbonator as main equipment for generating electricity. The heat recovery system is an important component of the power generation system, is not only the foundation of a turbine thermodynamic system, but also the core of a power plant thermodynamic system, and plays a decisive role in the heat economy of a unit and a power plant. The regenerative system generally extracts a portion of steam from several intermediate stages of the steam turbine and sends the extracted steam to a feedwater heater for heating boiler feedwater and various service steam. The main purpose of the regenerative cycle is to increase the average temperature of the working medium in the heat absorption process of the boiler, so as to improve the thermal economy of the unit.
As a large-energy-consumption household, a cement plant discharges a large amount of medium-low temperature heat while consuming a large amount of electric energy, and at present, the heat is mainly recovered by setting waste heat of a cement kiln to generate electricity, namely, waste heat boilers are arranged at the head and the tail of the cement kiln to recover waste heat, low-pressure steam generated by the waste heat is sent to an independent straight condensing turbine to do work to generate electricity, but the steam parameters are generally low, and the heat recovery efficiency and the power generation efficiency are relatively low.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims at providing a cement plant is from having power station cement kiln waste heat utilization system of heat recovery efficiency height, generating efficiency height.
The technical scheme is as follows: the utility model relates to a cement kiln waste heat utilization system of a cement plant self-contained power station, which comprises a waste heat boiler, a condensate pump, a boiler feed pump, a deaerator and a coal-fired boiler; the waste heat boiler is connected with the cement kiln firing system and used for recovering the waste heat of the cement kiln; the condensate pump sends the power station condensate water into the low-temperature section of the waste heat boiler for heating, then sends the condensate water to the deaerator for deaerating, and the condensate water is sent to the high-temperature section of the waste heat boiler for heating through the boiler feed pump after deaerating, and finally is sent to the coal-fired boiler as boiler feed water. High-temperature and high-pressure steam generated by the waste heat boiler is sent to a superheating section of the coal-fired boiler, mixed with the steam generated by the coal-fired boiler and superheated together, and sent to a steam turbine to do work to drive a generator to generate electricity.
The waste heat boiler comprises a kiln head waste heat boiler and a kiln tail waste heat boiler, is connected with a cement kiln firing system and absorbs waste heat in waste gas of the cement kiln, the heating surface of the waste heat boiler is configured according to thermal parameters of a steam turbine, the waste heat is used for heating feed water, and high-temperature and high-pressure saturated steam is generated and sent to the coal-fired boiler.
The system also comprises a steam turbine, a generator and auxiliary equipment matched with the steam turbine, such as an oil system of the steam turbine, a cooling system of the generator and the like.
The system also comprises a high-pressure heater and a low-pressure heater, and the high-pressure heater and the low-pressure heater can be switched to carry out water supply heating when the waste heat boiler fails, so that the safety and the stability of the system are ensured.
The system also comprises a condenser, a cooling tower and other cooling equipment, and the waste steam entering the steam turbine for doing work is cooled into condensed water.
Has the advantages that: compared with the prior art, the utility model has the advantages of as follows: 1. when the cement line is provided with the self-contained power station, the waste heat is more reasonably and efficiently utilized in a cascade mode according to the matching of the thermodynamic system parameters of the power station and the waste heat parameters, the overall power generation efficiency is improved, the coal consumption is reduced, the investment is saved, and therefore the green benefit is improved; 2. the waste heat of the cement kiln is used for replacing a steam extraction regenerative system of a steam turbine, so that the steam extraction of the steam turbine is reduced, the efficiency of the steam turbine is improved, and the coal consumption is reduced; 3. the waste heat power generation turbine is not arranged independently, so that the investment of equipment, civil engineering and the like can be saved.
Drawings
FIG. 1 is a diagram of a plant thermodynamic system of the present invention;
fig. 2 is a diagram of a turbine thermodynamic system of a conventional thermal power plant.
In the figure: 1-a waste heat boiler, 2-a coal-fired boiler, 3-a steam turbine, 4-a power generator, 5-a condenser, 6-a cooling tower, 7-a condensate pump, 8-a shaft seal cooler, 9-a boiler feed water pump, 10-a deaerator, 11-a high-pressure heater and 12-a low-pressure heater.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings.
As shown in fig. 1, a system for utilizing waste heat of a cement kiln of a self-contained power station of a cement plant comprises a self-contained thermal power generation power station system of the cement plant and a cement kiln waste heat recovery system. And performing parameter matching with a thermodynamic system of a self-contained power station by using the parameters and characteristics of the waste heat recovery system, so as to determine the arrangement of the heating surface of the waste heat boiler. When the system is connected, a steam extraction regenerative system pipeline of the steam turbine 3 is connected to the waste heat boiler 1, and an original regenerative system pipeline of the steam turbine 3 is used as a bypass so as to ensure the normal operation of the system when the waste heat boiler is in failure and improve the safety and stability of the system. After the high-temperature and high-pressure steam works in the steam turbine 3, the exhaust steam is condensed into condensed water through a cooling system consisting of the condenser 5, the cooling tower 6 and auxiliary equipment thereof. Condensate water is sent to shaft seal cooler 8 by condensate pump 7, send to waste heat boiler 1's low temperature section again and carry out primary heating, low temperature hot water after the heating sends to oxygen-eliminating device 10 and carries out thermal power deoxidization, feedwater after the deoxidization is sent to waste heat boiler 1 high temperature section heating again through boiler feed water pump 9, high temperature hot water after the heating sends to coal fired boiler 2 economizer, heat in coal fired boiler 2 and become high temperature high pressure superheated steam and send into steam turbine 3 and do work, accomplish a soda circulation. Meanwhile, according to the waste heat condition of the cement kiln, the waste heat boiler 1 can also generate high-temperature and high-pressure steam to be sent to a superheating section of the coal-fired boiler 2 to be superheated, and the high-temperature and high-pressure steam and the steam generated by the coal-fired boiler 1 are sent to a steam turbine 3 to do work. When the waste heat boiler 1 is in fault, condensed water is sent to the low-pressure heater 12 for heating after passing through the shaft seal cooler 8, heated steam enters the deaerator 10 for deaerating, is sent to the high-pressure heater 11 for heating through the boiler water feed pump 9, and is finally sent to the coal-fired boiler 1. At this time, the heating steam of the low pressure heater 12 and the high pressure heater 11 is supplied from the extraction regenerative system of the steam turbine 3, and the steam turbine 3 also increases heat consumption by extraction, thereby increasing coal consumption. After the waste heat boiler 1 is repaired, the bypass of the low-pressure heater 12 and the high-pressure heater 11 is cut off, and the waste heat of the cement kiln is continuously utilized to replace the steam extraction heat recovery of the steam turbine.
As shown in fig. 2, compared with the conventional cement plant self-contained power station and waste heat power station, the main changes of the present invention are as follows:
(1) the waste heat power generation is not matched with the independent steam turbine 3, the generator 4 and auxiliary equipment, but replaces a steam extraction heat recovery system of the steam turbine 3, and arranged steam turbine rooms and the like can be omitted;
(2) the waste heat boiler 1 does not simply calculate and arrange the heating surface according to the waste heat of the flue gas, but arranges the heating surface according to the matched power station steam turbine, and the heating of the power station condensed water and the water supply system is not carried out in the low-pressure heater 12 and the high-pressure heater 11, but is carried out in the waste heat boiler 1;
(3) after the power station steam turbine is configured according to the system, the heat recovery system utilizes the waste heat boiler 1 to perform normal operation, and the waste heat boiler 1 can be switched to the high-pressure heater 11 and the low-pressure heater 12 to perform water supply heating when the waste heat boiler 1 fails, so that the safety and the stability of the system are ensured.
(4) The waste heat boiler 1 generates high-pressure steam, the high-pressure steam is heated by the coal-fired boiler 2 and then is sent to the steam turbine 3 to generate electricity, and the low-pressure steam is not generated and is sent to the steam turbine 3 to generate electricity as supplementary steam.
Claims (5)
1. The utility model provides a cement plant is from power station cement kiln waste heat utilization system which characterized in that: comprises a waste heat boiler (1), a condensate pump (7), a boiler feed pump (9), a deaerator (10) and a coal-fired boiler (2); the waste heat boiler (1) is connected with a cement kiln firing system; condensate pump (7) send into exhaust-heat boiler (1) low temperature section heating with the power station condensate water, send to deaerator (10) deoxidization afterwards, send to exhaust-heat boiler (1) high temperature section heating again through boiler feed pump (9) after the deoxidization, send to coal fired boiler (2) as boiler feed water at last, the high temperature high pressure steam that exhaust-heat boiler produced sends to coal fired boiler (2) superheated section, mix with coal fired boiler (2) produced steam and overheat jointly, and send into and do work drive generator (4) electricity generation in steam turbine (3).
2. The system of claim 1, wherein: the waste heat boiler (1) comprises a kiln head waste heat boiler and a kiln tail waste heat boiler.
3. The system of claim 1, wherein: the system also comprises a steam turbine (3), a generator (4) and auxiliary equipment matched with the steam turbine.
4. The system of claim 1, wherein: the system further comprises a high pressure heater (11) and a low pressure heater (12).
5. The system of claim 1, wherein: the system also comprises a cooling device, wherein the cooling device comprises a condenser (5) and a cooling tower (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120595687.3U CN214836592U (en) | 2021-03-24 | 2021-03-24 | Cement kiln waste heat utilization system of cement plant self-contained power station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120595687.3U CN214836592U (en) | 2021-03-24 | 2021-03-24 | Cement kiln waste heat utilization system of cement plant self-contained power station |
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| CN214836592U true CN214836592U (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120595687.3U Active CN214836592U (en) | 2021-03-24 | 2021-03-24 | Cement kiln waste heat utilization system of cement plant self-contained power station |
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| CN (1) | CN214836592U (en) |
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2021
- 2021-03-24 CN CN202120595687.3U patent/CN214836592U/en active Active
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