CN110529207B - Thermodynamic system of 630 ℃ secondary reheating unit and optimization method thereof - Google Patents
Thermodynamic system of 630 ℃ secondary reheating unit and optimization method thereof Download PDFInfo
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- CN110529207B CN110529207B CN201910943553.3A CN201910943553A CN110529207B CN 110529207 B CN110529207 B CN 110529207B CN 201910943553 A CN201910943553 A CN 201910943553A CN 110529207 B CN110529207 B CN 110529207B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/006—Auxiliaries or details not otherwise provided for
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K19/00—Regenerating or otherwise treating steam exhausted from steam engine plant
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention provides a thermodynamic system of a 630 ℃ secondary reheating unit, which comprises a boiler, wherein an ultrahigh pressure cylinder, a high pressure cylinder and a medium pressure cylinder are communicated and arranged on one side of the boiler, a low pressure cylinder is communicated and arranged on one side of the medium pressure cylinder, a steam turbine is communicated and arranged on one side of the ultrahigh pressure cylinder, the steam turbine is communicated and arranged with the high pressure cylinder, a high pressure heater is communicated and arranged on one side of the steam turbine, the high pressure heater is respectively communicated and arranged with the boiler and the ultrahigh pressure cylinder, a condenser is communicated and arranged on one side of the low pressure cylinder, a low pressure heater is respectively communicated and arranged with the low pressure cylinder and the medium pressure cylinder, a first water pump is communicated and arranged between the condenser and the low pressure heater, and a third water pump is communicated with the medium pressure cylinder.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a thermodynamic system of a 630 ℃ secondary reheating unit and an optimization method thereof.
Background
At present, for a 1000MW secondary reheating unit with parameters of 35MPa/615 ℃/630 ℃/630 ℃, the superheat degree of each section of steam extraction after reheating is greatly improved due to higher temperature of reheated steam, the heat exchange temperature difference in the corresponding regenerative heater is increased, the irreversible loss is increased, the benefit brought by improving the steam parameters is weakened, and the higher the steam parameters are, the more outstanding the contradiction is. The conventional countermeasure in engineering is that an external steam cooler is additionally arranged on the reheated part of the backheating extraction steam, so that the superheat degree of the backheating extraction steam is properly reduced.
However, as the initial temperature and the reheating temperature are increased, the extraction temperature is increased, and the external steam cooler and part of the high-pressure heater are required to be made of materials suitable for higher temperature grades, so that the cost is greatly increased, and therefore, the thermodynamic system of the 630 ℃ secondary reheating unit and the optimization method thereof are provided, not only can the irreversible loss caused by overlarge heat exchange temperature difference in the high-pressure heater or the low-pressure heater be reduced, but also the cost can be reduced, and the safety and reliability of the unit are improved.
Disclosure of Invention
The invention provides a thermodynamic system of a 630 ℃ secondary reheating unit and an optimization method thereof, which not only can reduce irreversible loss caused by overlarge heat exchange temperature difference in a heater, but also can reduce cost and improve the safety and reliability of the unit.
The technical scheme of the invention is realized as follows: the utility model provides a 630 ℃ secondary reheat unit thermodynamic system, including the boiler, boiler one side intercommunication is provided with the ultra-high pressure jar, high pressure jar and middling pressure jar, middling pressure jar one side intercommunication is provided with the low pressure jar, ultra-high pressure jar one side intercommunication is provided with the steam turbine, steam turbine and high pressure jar intercommunication, steam turbine one side intercommunication is provided with high pressure heater, high pressure heater communicates with boiler and ultra-high pressure jar respectively, low pressure jar one side intercommunication is provided with the condenser, condenser one side intercommunication is provided with the low pressure heater, low pressure heater communicates with low pressure jar and middling pressure jar respectively, the intercommunication is provided with first water pump between condenser and the low pressure heater, the intercommunication is provided with the second water pump in the low pressure heater, the intercommunication is provided with the third water pump between low pressure heater and the high pressure heater, the intercommunication is provided with the oxygen-eliminating device on the third water pump, the oxygen-eliminating device communicates with middling pressure jar and steam turbine respectively.
The steam generated in the boiler enters an ultrahigh pressure cylinder, the ultrahigh pressure cylinder reduces the pressure of the steam into three parts, one part of the steam is transmitted back into the boiler, and the other part of the steam is transmitted to a steam turbine, and the other part of the steam directly enters a high pressure heater; the steam part conveyed into the boiler is conveyed into the high-pressure cylinder again by the boiler, the pressure of the steam is reduced again by the high-pressure cylinder, the treated partial steam is divided into two parts, one part is conveyed back into the boiler again, and the other part is conveyed into the steam turbine; part of steam transmitted back into the boiler is transmitted into the medium-pressure cylinder by the boiler, the pressure of the steam is regulated by the medium-pressure cylinder, the regulated steam is divided into two parts, one part of steam is transmitted into the low-pressure cylinder, and the other part of steam is transmitted into the deaerator; the steam entering the low-pressure cylinder is divided into three parts, wherein one part is processed by the low-pressure cylinder to convert the steam into mechanical energy to be transmitted into the generator, one part of the steam is collected by the condenser, and the other part of the steam is transmitted into the low-pressure heater; the condenser transmits the collected steam to the low-pressure heater for heating, a part of the steam transmitted to the low-pressure heater is also heated by the low-temperature heater, and the low-temperature heater transmits the heated steam to the deaerator; the steam entering the deaerator, the steam entering the deaerator in the step 3 and the steam entering the steam turbine are simultaneously transmitted into a high-pressure heater, the high-pressure heater processes the steam and transmits the processed steam into a boiler; the boiler continues to process the steam entering the boiler, and in the process, the steam can flow in a plurality of devices and then respectively enter the high-pressure heater or the low-pressure heater, so that the temperature of the steam entering the high-pressure heater or the low-pressure heater cannot be excessively high to damage the high-pressure heater or the low-pressure heater.
As a preferred embodiment, the high-pressure heater comprises a No. 1 high-pressure heater, a No. 2 high-pressure heater, a No. 3 high-pressure heater, a No. 4 high-pressure heater, a No. 5 high-pressure heater and a No. 6 high-pressure heater which are mutually communicated, wherein the No. 1 high-pressure heater is respectively communicated with the boiler and the ultra-high-pressure cylinder, the steam turbine is respectively communicated with the No. 2 high-pressure heater, the No. 3 high-pressure heater, the No. 4 high-pressure heater, the No. 5 high-pressure heater and the No. 6 high-pressure heater, and the third water pump is communicated with the No. 6 high-pressure heater, so that steam can be subjected to more thorough high-pressure heating treatment in the high-pressure heater, the steam entering the boiler does not need to be reheated, the work of the boiler for heating air can be saved, and the energy consumed by the boiler can be reduced.
As a preferred embodiment, the low pressure heater includes a No. 1 low pressure heater, a No. 2 low pressure heater, a No. 3 low pressure heater and a No. 4 low pressure heater which are mutually communicated, the No. 1 low pressure heater is communicated with the third water pump, the low pressure cylinder is respectively communicated with the No. 1 low pressure heater, the No. 2 low pressure heater, the No. 3 low pressure heater and the No. 4 low pressure heater, the condenser is provided with the No. 6 low pressure heater in one side communication, the No. 5 low pressure heater is provided with the No. 5 low pressure heater in one side communication, and the No. 5 low pressure heater is communicated with the No. 4 low pressure heater, so that the steam entering into the low pressure heater can be better heated, and the steam is more thoroughly treated in the low pressure heater.
As a preferred embodiment, the third water pump includes A water pump and B water pump, A water pump and 6 # high-pressure heater intercommunication, B water pump and 1 # low-pressure heater intercommunication, the deaerator includes first deaerator and second deaerator, first deaerator respectively with A water pump, B water pump and steam turbine intercommunication, the second deaerator respectively with B water pump, 1 # low-pressure heater and middling pressure jar intercommunication, A water pump and B water pump open simultaneously or close simultaneously, can open A water pump and B water pump as required with the steam flow who controls into in the high-pressure heater, save the energy that A water pump and B water pump practical in-process consumed.
An optimization method of a thermodynamic system of a 630 ℃ secondary reheating unit comprises the following steps:
step 1: the steam generated in the boiler enters an ultrahigh pressure cylinder, the ultrahigh pressure cylinder reduces the pressure of the steam into three parts, one part of the steam is transmitted back into the boiler, and the other part of the steam is transmitted to a steam turbine, and the other part of the steam directly enters a high pressure heater;
step 2: the steam part transmitted into the boiler in the step 1 is transmitted into the high-pressure cylinder again by the boiler, the pressure of the steam is reduced again by the high-pressure cylinder, the treated partial steam is divided into two parts, one part is transmitted back into the boiler again, and the other part is transmitted into the steam turbine;
step 3: part of the steam transmitted back into the boiler in the step 2 is transmitted into a medium pressure cylinder by the boiler, the pressure of the steam is regulated by the medium pressure cylinder, the regulated steam is divided into two parts, one part of the steam is transmitted into a low pressure cylinder, and the other part of the steam is transmitted into a deaerator;
step 4: in the step 3, the steam entering the low-pressure cylinder is divided into three parts, wherein one part is processed by the low-pressure cylinder to convert the steam into mechanical energy to be transmitted into the generator, one part of the steam is collected by the condenser, and the other part of the steam is transmitted into the low-pressure heater;
step 5: in the step 4, the condenser transmits the collected steam to the low-pressure heater for heating, a part of the steam transmitted to the low-pressure heater is also heated by the low-temperature heater, and the low-temperature heater transmits the heated steam to the deaerator;
step 6: the steam entering the deaerator in the step 5, the steam entering the deaerator in the step 3 and the steam entering the steam turbine are simultaneously transmitted into a high-pressure heater, and the high-pressure heater processes the steam and transmits the processed steam into a boiler;
step 7: the boiler continues to process the steam entering the boiler.
After the technical scheme is adopted, the invention has the beneficial effects that:
1. the temperature of the steam entering the high-pressure heater can be reduced through the flow of the steam among the devices, so that the high-temperature risk of the high-pressure heater is avoided, and the reliability of a thermodynamic system is improved;
2. the loss of the primary and secondary reheating steam flow is reduced, all steam in the process can be fully collected, potential safety hazards caused by steam pressure increase when the steam flow is overlarge are avoided, meanwhile, the steam can be prevented from flowing to one side of the system, and resources are saved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a flow chart of the present invention.
In the figure, a 1-boiler; 2-an ultrahigh pressure cylinder; 3-a high-pressure cylinder; 4-a medium pressure cylinder; 5-a low pressure cylinder; 6-a steam turbine; 7-a high pressure heater; 8-a condenser; 9-a low pressure heater; 71-1 high-pressure heater; 72-2 high pressure heater; 73-3 high pressure heater; 74-4 high pressure heater; 75-5 high pressure heater; 76-6 high pressure heater; 81-a first water pump; 91-a second water pump; 92-a third water pump; 93-1 low pressure heater; 94-2 low pressure heater; 95-3 low pressure heater; 96-4 low pressure heater; 97-6 low pressure heater; 98-5 low pressure heater; 921-A water pump; 922-B water pump; 920-deaerator; 9211-a first deaerator; 9221-a second deaerator.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-2, a thermodynamic system of a 630 ℃ secondary reheating unit comprises a boiler 1, wherein an ultrahigh pressure cylinder 32, a high pressure cylinder 32 and a medium pressure cylinder 4 are arranged on one side of the boiler 1 in a communicating manner, a low pressure cylinder 5 is arranged on one side of the medium pressure cylinder 4 in a communicating manner, a steam turbine 6 is arranged on one side of the ultrahigh pressure cylinder 32 in a communicating manner, the steam turbine 6 is communicated with the high pressure cylinder 32, a high pressure heater 7 is arranged on one side of the steam turbine 6 in a communicating manner, the high pressure heater 7 is respectively communicated with the boiler 1 and the ultrahigh pressure cylinder 32, a condenser 8 is arranged on one side of the low pressure cylinder 5 in a communicating manner, a low pressure heater 9 is respectively communicated with the low pressure cylinder 5 and the medium pressure cylinder 4, a first water pump 81 is arranged between the condenser 8 and the low pressure heater 9 in a communicating manner, a second water pump 91 is arranged in the low pressure heater 9 in a communicating manner, a third water pump 92 is arranged between the low pressure heater 9 and the high pressure heater 7 in a communicating manner, the third water pump 92 is communicated with the medium pressure cylinder 4 in a communicating manner, a third water pump 92 is provided with the oxygen remover 920 is arranged on the third water pump 92 in a communicating manner, and the oxygen remover 920 is respectively communicated with the medium pressure cylinders 4 and 6.
The steam generated in the boiler 1 enters an ultrahigh pressure cylinder 32, the ultrahigh pressure cylinder 32 reduces the pressure of the steam into three parts, one part is transmitted back to the boiler 1, and the other part is transmitted to a steam turbine 6, and the other part directly enters a high pressure heater 7; the steam part conveyed into the boiler 1 is conveyed into the high-pressure cylinder 3 again by the boiler 1, the pressure of the steam is reduced again by the high-pressure cylinder 3, the treated partial steam is divided into two parts, one part is conveyed back into the boiler 1 again, and the other part is conveyed into the steam turbine 6; part of the steam transmitted back into the boiler 1 is transmitted into the medium pressure cylinder 4 by the boiler 1, the pressure of the steam is regulated by the medium pressure cylinder 4, the regulated steam is divided into two parts, one part of the steam is transmitted into the low pressure cylinder 5, and the other part of the steam is transmitted into the deaerator; the steam entering the low pressure cylinder 5 is divided into three parts, wherein one part is processed by the low pressure cylinder 5 to convert the steam into mechanical energy to be transmitted into a generator, one part of the steam is collected by the condenser 8, and the other part of the steam is transmitted into the low pressure heater 9; the condenser 8 transmits the collected steam to the low-pressure heater 9 for heating, and a part of the steam transmitted to the low-pressure heater 9 is also heated by the low-temperature heater, and the low-temperature heater transmits the heated steam to the deaerator; the steam entering the deaerator, the steam entering the deaerator in the step 3 and the steam entering the steam turbine 6 are simultaneously transmitted into the high-pressure heater 7, and the high-pressure heater 7 processes the steam and transmits the processed steam into the boiler 1; the boiler 1 continues to process the steam entering the boiler 1, in which process the steam will after flowing in several devices enter the high pressure heater 7 or the low pressure heater 9 respectively, so that the temperature of the steam entering the high pressure heater 7 or the low pressure heater 9 will not be too high to damage the high pressure heater 7 or the low pressure heater 9.
The high-pressure heater 7 comprises a number 1 high-pressure heater 71, a number 2 high-pressure heater 72, a number 3 high-pressure heater 73, a number 4 high-pressure heater 74, a number 5 high-pressure heater 75 and a number 6 high-pressure heater 76 which are mutually communicated, wherein the number 1 high-pressure heater 71 is respectively communicated with the boiler 1 and the ultrahigh-pressure cylinder 32, the steam turbine 6 is respectively communicated with the number 2 high-pressure heater 72, the number 3 high-pressure heater 73, the number 4 high-pressure heater 74, the number 5 high-pressure heater 75 and the number 6 high-pressure heater 76, and the third water pump 92 is communicated with the number 6 high-pressure heater 76, so that steam can be subjected to more thorough high-pressure heating treatment in the high-pressure heater 7, the steam entering the boiler 1 does not need to be reheated, the work done by the heating air of the boiler 1 can be saved, and the energy consumed by the boiler 1 can be reduced.
The low pressure heater 9 includes the low pressure heater 93 of intercommunication, the low pressure heater 94 of No. 1, the low pressure heater 94 of No. 2, the low pressure heater 95 of No. 3 and the low pressure heater 93 of No. 4 and the third water pump 92 intercommunication, low pressure jar 5 respectively with the low pressure heater 93 of No. 1, the low pressure heater 94 of No. 2, the low pressure heater 95 of No. 3 and the low pressure heater 96 of No. 4 intercommunication, condenser 8 one side intercommunication is provided with the low pressure heater 97,6 of No. 6 low pressure heater 97 one side intercommunication is provided with the low pressure heater 98 of No. 5, no. 5 low pressure heater 98 and the low pressure heater 96 of No. 4 intercommunication, make can be better carry out the heating treatment to the steam that enters into in the low pressure heater 9, make steam by the more thoroughly of being handled in the low pressure heater 9.
The third water pump 92 includes an a water pump 921 and a B water pump 922, the a water pump 921 being in communication with the No. 6 high pressure heater 76, the B water pump 922 being in communication with the No. 1 low pressure heater 93. The deaerator 920 includes first deaerator 9211 and second deaerator 9221, first deaerator 9211 respectively with A water pump 921, B water pump 922 and steam turbine 6 intercommunication, second deaerator 9221 respectively with B water pump 922, no. 1 low pressure heater 93 and middling pressure jar 4 intercommunication, A water pump 921 and B water pump 922 open simultaneously or close simultaneously, can open A water pump 921 and B water pump 922 as required with the steam flow that control enters into in the high pressure heater 7, save the energy that A water pump 921 and B water pump 922 in-process were practical consumes.
An optimization method of a thermodynamic system of a 630 ℃ secondary reheating unit comprises the following steps:
step 1: the steam generated in the boiler 1 enters an ultrahigh pressure cylinder 32, the ultrahigh pressure cylinder 32 reduces the pressure of the steam into three parts, one part is transmitted back to the boiler 1, and the other part is transmitted to a steam turbine 6, and the other part directly enters a high pressure heater 7;
step 2: the steam part transmitted into the boiler 1 in the step 1 is transmitted into the high-pressure cylinder 3 again by the boiler 1, the pressure of the steam is reduced again by the high-pressure cylinder 3, the treated partial steam is divided into two parts, one part is transmitted back into the boiler 1 again, and the other part is transmitted into the steam turbine 6;
step 3: in the step 2, part of steam transmitted back into the boiler 1 is transmitted into the medium pressure cylinder 4 by the boiler 1, the pressure of the steam is regulated by the medium pressure cylinder 4, the regulated steam is divided into two parts, one part of steam is transmitted into the low pressure cylinder 5, and the other part of steam is transmitted into the deaerator;
step 4: in the step 3, the steam entering the low-pressure cylinder 5 is divided into three parts, wherein one part is processed by the low-pressure cylinder 5 to convert the steam into mechanical energy to be transmitted into a generator, one part of the steam is collected by the condenser 8, and the other part of the steam is transmitted into the low-pressure heater 9;
step 5: in the step 4, the condenser 8 transmits the collected steam to the low-pressure heater 9 for heating, and a part of the steam transmitted to the low-pressure heater 9 is also heated by the low-temperature heater, and the low-temperature heater transmits the heated steam to the deaerator;
step 6: the steam entering the deaerator in the step 5, the steam entering the deaerator in the step 3 and the steam entering the steam turbine 6 are simultaneously transmitted into the high-pressure heater 7, and the high-pressure heater 7 processes the steam and transmits the processed steam into the boiler 1;
step 7: the boiler 1 continues to process the steam entering the boiler 1.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (2)
1. The utility model provides a 630 ℃ secondary reheat unit thermodynamic system which is characterized by, including the boiler, boiler one side intercommunication is provided with ultra-high pressure cylinder, high pressure cylinder and well pressure cylinder, well pressure cylinder one side intercommunication is provided with the low pressure cylinder, ultra-high pressure cylinder one side intercommunication is provided with the steam turbine, steam turbine and high pressure cylinder intercommunication, steam turbine one side intercommunication is provided with high pressure heater, high pressure heater communicates with boiler and ultra-high pressure cylinder respectively, low pressure cylinder one side intercommunication is provided with the condenser, condenser one side intercommunication is provided with the low pressure heater, low pressure heater communicates with low pressure cylinder and well pressure cylinder respectively, the intercommunication is provided with first water pump between condenser and the low pressure heater, the intercommunication is provided with the second water pump in the low pressure heater, the intercommunication is provided with the third water pump between low pressure heater and the high pressure heater, the third water pump communicates with well pressure cylinder, the intercommunication is provided with the oxygen remover on the third water pump, oxygen remover communicates with medium pressure cylinder and steam turbine respectively;
the high-pressure heater comprises a No. 1 high-pressure heater, a No. 2 high-pressure heater, a No. 3 high-pressure heater, a No. 4 high-pressure heater, a No. 5 high-pressure heater and a No. 6 high-pressure heater which are mutually communicated, wherein the No. 1 high-pressure heater is respectively communicated with the boiler and the ultrahigh-pressure cylinder, the steam turbine is respectively communicated with the No. 2 high-pressure heater, the No. 3 high-pressure heater, the No. 4 high-pressure heater, the No. 5 high-pressure heater and the No. 6 high-pressure heater, and the third water pump is communicated with the No. 6 high-pressure heater;
the low-pressure heater comprises a No. 1 low-pressure heater, a No. 2 low-pressure heater, a No. 3 low-pressure heater and a No. 4 low-pressure heater which are mutually communicated, the No. 1 low-pressure heater is communicated with a third water pump, the low-pressure cylinder is respectively communicated with the No. 1 low-pressure heater, the No. 2 low-pressure heater, the No. 3 low-pressure heater and the No. 4 low-pressure heater, one side of the condenser is communicated with a No. 6 low-pressure heater, one side of the No. 6 low-pressure heater is communicated with a No. 5 low-pressure heater, and the No. 5 low-pressure heater is communicated with the No. 4 low-pressure heater;
the third water pump comprises an A water pump and a B water pump, wherein the A water pump is communicated with a No. 6 high-pressure heater, and the B water pump is communicated with a No. 1 low-pressure heater;
the deaerator comprises a first deaerator and a second deaerator, the first deaerator is respectively communicated with a water pump A, a water pump B and a steam turbine, and the second deaerator is respectively communicated with a water pump B, a low-pressure heater No. 1 and a medium-pressure cylinder;
the water pump A and the water pump B are simultaneously started or closed.
2. A method of optimizing a thermodynamic system of a 630 ℃ secondary reheat unit as set forth in claim 1, comprising the steps of:
step 1: the steam generated in the boiler enters an ultrahigh pressure cylinder, the ultrahigh pressure cylinder reduces the pressure of the steam into three parts, one part of the steam is transmitted back into the boiler, and the other part of the steam is transmitted to a steam turbine, and the other part of the steam directly enters a high pressure heater;
step 2: the steam part transmitted into the boiler in the step 1 is transmitted into the high-pressure cylinder again by the boiler, the pressure of the steam is reduced again by the high-pressure cylinder, the treated partial steam is divided into two parts, one part is transmitted back into the boiler again, and the other part is transmitted into the steam turbine;
step 3: part of the steam transmitted back into the boiler in the step 2 is transmitted into a medium pressure cylinder by the boiler, the pressure of the steam is regulated by the medium pressure cylinder, the regulated steam is divided into two parts, one part of the steam is transmitted into a low pressure cylinder, and the other part of the steam is transmitted into a deaerator;
step 4: in the step 3, the steam entering the low-pressure cylinder is divided into three parts, wherein one part is processed by the low-pressure cylinder to convert the steam into mechanical energy to be transmitted into the generator, one part of the steam is collected by the condenser, and the other part of the steam is transmitted into the low-pressure heater;
step 5: in the step 4, the condenser transmits the collected steam to the low-pressure heater for heating, a part of the steam transmitted to the low-pressure heater is also heated by the low-temperature heater, and the low-temperature heater transmits the heated steam to the deaerator;
step 6: the steam entering the deaerator in the step 5, the steam entering the deaerator in the step 3 and the steam entering the steam turbine are simultaneously transmitted into a high-pressure heater, and the high-pressure heater processes the steam and transmits the processed steam into a boiler;
step 7: the boiler continues to process the steam entering the boiler.
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| CN108412564A (en) * | 2018-05-02 | 2018-08-17 | 华北电力大学 | A kind of double reheat system and method for efficient backheat and optimization steam extraction |
| CN110030047A (en) * | 2019-05-21 | 2019-07-19 | 福建省东锅节能科技有限公司 | Heat generating system and its working method again three times |
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