CN110425509B - Groove type heat conduction oil steam generation system and control method thereof - Google Patents
Groove type heat conduction oil steam generation system and control method thereof Download PDFInfo
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- CN110425509B CN110425509B CN201910794194.XA CN201910794194A CN110425509B CN 110425509 B CN110425509 B CN 110425509B CN 201910794194 A CN201910794194 A CN 201910794194A CN 110425509 B CN110425509 B CN 110425509B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000003303 reheating Methods 0.000 claims abstract description 28
- 238000009833 condensation Methods 0.000 claims abstract description 9
- 230000005494 condensation Effects 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 123
- 230000008020 evaporation Effects 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/16—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
- F22B1/167—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour using an organic fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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Abstract
The invention discloses a groove type heat conducting oil steam generation system and a control method thereof, wherein the steam generation system comprises a main steam loop and a reheating steam loop which are arranged in parallel, the reheating steam loop comprises M-stage reheaters which are arranged in series, a heat conducting oil collecting pipeline is arranged between an outlet of the main steam loop and an outlet of an N-1-th stage reheater in the reheating steam loop, and the heat conducting oil collecting pipeline collects heat conducting oil at the outlet of the main steam loop to an outlet of the N-1-th stage reheater in the reheating steam loop for mixing the heat conducting oil. The control method is that the heat conduction oil at the outlet of the main steam loop in the groove type heat conduction oil steam generation system is mixed with the heat conduction oil at the outlet of the N-1 level reheater in the reheating steam loop and then is introduced into the inlet of the N level reheater, and the mixed heat conduction oil is sent into the condensation heat collection system for reheating after finishing heat exchange through the N level to the M level reheater in sequence. The invention is beneficial to avoiding the waste of heat of the heat conducting oil and improving the utilization efficiency of the steam generating system.
Description
Technical Field
The invention relates to the technical field of photo-thermal power generation, in particular to a groove type heat conduction oil steam generation system and a control method thereof
Background
The trough technology is the most mature solar photo-thermal power generation technology with best reliability and maximum installation. The tank type photo-thermal power station generally adopts heat conduction oil as a heat medium to heat water supply or heat conduction steam, and the tank type heat conduction oil steam generation system with reheating generally consists of two independent loops: the superheater, the evaporator (including the steam-water separator) and the preheater form a main steam loop for generating high-temperature and high-pressure steam for driving the steam turbine to do work, and the reheater forms a reheating steam loop for reheating the steam after doing work, so that the cycle thermal efficiency is improved.
During operation, the heat conduction oil from the heat collection field is divided into two independent branches, and the two independent branches enter a main steam loop (sequentially flows through a superheater, an evaporator (comprising a steam-water separator) and a preheater) and a reheat steam loop to exchange heat with water supply or low-pressure steam, and cold conduction oil of the two loops is mixed and collected again after heat exchange and flows back to the heat collection field to be heated, so that the circulation is repeated. Various heat conduction oils applied in the prior engineering are affected by physical parameters, the use temperature is generally below 450 ℃, so that the heat conduction oil groove type photo-thermal power station steam generation system is generally in a medium temperature zone to work, a reheater loop is large in temperature crossing of cold and hot media and weak in heat transfer driving force, the heat exchange area is generally required to be relatively large, the heat exchange area is limited by manufacturing difficulty and economy, and more project evaporation systems are provided with heat exchangers with M (M is more than or equal to 2) connected in series to meet the heat exchange requirement, as shown in figure 1.
Because the parameters such as the steam temperature, the pressure, the flow and the like generated by the main steam loop and the reheat steam loop are different, the oil temperatures of the outlets of the two independent loops are also different (the steam pressure of the main steam loop is far higher than that of the reheat steam loop, the temperature is limited by the saturated phase transition point temperature of the high-pressure steam at the evaporator, and the oil temperature of the outlet of the main steam loop is generally far higher than that of the outlet of the reheat steam loop). The existing evaporation system directly mixes and cools the heat conduction oil at the outlets of two different temperature loops and then sends the mixed heat conduction oil into the condensing and heat collecting system for reheating, so that on one hand, a part of heat of the heat conduction oil is wasted because of not being utilized in the evaporation system to a certain extent, and on the other hand, the temperature of the heat conduction oil at the outlet of the steam generating system is always higher than the temperature of the heat conduction oil required by the optimal design point of the condensing and heat collecting system due to the influences of steam parameters and heat exchanger design.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a groove type photo-thermal power station steam generation system with higher heat utilization efficiency and a control method thereof.
The invention provides a groove type heat conducting oil steam generation system, which comprises a main steam loop and a reheat steam loop which are arranged in parallel, wherein the reheat steam loop comprises M-stage reheaters which are arranged in series, a heat conducting oil collecting pipeline is arranged between an outlet of the main steam loop and an outlet of an N-1-th-stage reheater in the reheat steam loop, and the heat conducting oil collecting pipeline collects heat conducting oil at the outlet of the main steam loop to an outlet of the N-1-th-stage reheater in the reheat steam loop for mixing the heat conducting oil, wherein M is more than or equal to 2 and N is more than or equal to 2 and less than or equal to M.
According to one embodiment of the tank-type conduction oil steam generation system, the main steam loop comprises a preheater, an evaporator, a superheater and a control valve which are arranged in series, and the feed water sequentially flows through the preheater, the evaporator and the superheater to exchange heat with the conduction oil to form superheated steam, wherein the evaporator further comprises a steam-water separator.
According to one embodiment of the groove type heat conducting oil steam generation system, the reheating steam loop comprises M-stage reheaters and control valves which are arranged in series, and steam from the steam turbine after acting sequentially flows through the M-stage reheaters to the 1-stage reheaters to exchange heat with heat conducting oil to form reheating steam.
According to one embodiment of the groove type heat conduction oil steam generation system, heat conduction oil from a condensation heat collection system is divided into two branches and respectively enters a main steam loop and a reheat steam loop, the heat conduction oil entering the main steam loop sequentially flows through a superheater, an evaporator and a preheater to exchange heat with water and then flows out of an outlet of the main steam loop, the heat conduction oil entering the reheat steam loop sequentially flows through a 1 st-stage reheater to an N-1 st-stage reheater to exchange heat and then is mixed with the heat conduction oil from an outlet of the main steam loop, and then is sequentially introduced into the N-stage reheater to the M-stage reheater through a pipeline to complete heat exchange and then is sent into the condensation heat collection system to be heated again.
The invention further provides a control method of the groove type heat conduction oil steam generation system, heat conduction oil at the outlet of a main steam loop in the groove type heat conduction oil steam generation system is mixed with heat conduction oil at the outlet of an N-1 level reheater in a reheating steam loop and then introduced into the inlet of the N level reheater, and the mixed heat conduction oil is sent into a condensation heat collection system for reheating after finishing heat exchange through the N level to M level reheater in sequence, wherein M is the total number of the reheater in the reheating steam loop, M is more than or equal to 2, and N is less than or equal to 2 and less than or equal to M.
According to one embodiment of the control method of the groove type heat conducting oil steam generating system, the oil quantity of the inlet of the 1 st stage reheater is adjusted through temperature interlocking, so that the difference value between the oil temperature of the outlet of the N-1 st stage reheater and the oil temperature of the outlet of the main loop preheater is in the range of 0-10 ℃.
The invention also provides a control method of the groove type heat conducting oil steam generation system, wherein heat conducting oil at the outlet of a main steam loop in the groove type heat conducting oil steam generation system is mixed with heat conducting oil at the outlet of an N-1 level reheater in a reheating steam loop through a heat conducting oil collecting pipeline, and then introduced into the inlet of the N level reheater, and the mixed heat conducting oil is sent into a condensing heat collection system for reheating after completing heat exchange through the N level to M level reheater, wherein M is the total number of stages of the reheater in the reheating steam loop, M is more than or equal to 2, and N is more than or equal to 2 and less than or equal to M.
According to one embodiment of the control method of the groove type heat conducting oil steam generating system, the oil quantity of the inlet of the 1 st stage reheater is adjusted through temperature interlocking, so that the difference value between the oil temperature of the outlet of the N-1 st stage reheater and the oil temperature of the outlet of the main loop preheater is in the range of 0-10 ℃.
Compared with the prior art, the method has the advantages that the heat conduction oil temperature of the N-1-level reheater outlet is approximately equal to the heat conduction oil temperature of the main steam loop outlet by controlling the heat conduction oil flow of the reheat steam loop inlet through the heat conduction oil temperature of the main loop outlet, so that heat waste caused by mixing of heat conduction oils with different oil temperatures is avoided, and the heat utilization efficiency of an evaporation system is higher; the heat utilization efficiency of the heat conduction oil is improved by reasonably adjusting the proportion of the heat exchange area of the M-stage heat exchanger of the reheat steam loop, the consumption of the heat conduction oil is reduced, and further the construction and operation cost of related supporting facilities of the heat conduction oil is reduced, so that better economic benefit is obtained compared with that of the traditional groove type photo-thermal power station evaporation system.
Drawings
Fig. 1 shows a schematic structure of a prior art tank type heat transfer oil steam generating system.
Fig. 2 illustrates a schematic structure of a tank type conduction oil steam generation system according to an exemplary embodiment of the present invention.
Reference numerals illustrate:
the system comprises a 1-superheater, a 2-evaporator (comprising a steam-water separator), a 3-preheater, a 4-heat conducting oil collecting pipeline, a 5-1 st stage reheater, a 5-N stage reheater and a 5-M stage reheater.
Detailed Description
All of the features disclosed in this specification, or all of the steps in a method or process disclosed, may be combined in any combination, except for mutually exclusive features and/or steps.
Any feature disclosed in this specification may be replaced by alternative features serving the same or equivalent purpose, unless expressly stated otherwise. That is, each feature is one example only of a generic series of equivalent or similar features, unless expressly stated otherwise.
The tank type conduction oil vapor generation system and the control method thereof of the present invention are specifically described below.
The invention provides a control method of a groove type heat conducting oil steam generation system, which comprises the steps of mixing heat conducting oil at an outlet of a main steam loop in the groove type heat conducting oil steam generation system with heat conducting oil at an outlet of an N-1 level reheater in a reheating steam loop, introducing the mixed heat conducting oil into an inlet of the N level reheater, and sending the mixed heat conducting oil into a condensation heat collection system for reheating after completing heat exchange through the N level reheater to the M level reheater, wherein M is the total number of the reheater in the reheating steam loop, M is more than or equal to 2, and N is less than or equal to 2 and less than or equal to M.
The invention mixes the heat conduction oil at the outlet of the main steam loop with the heat conduction oil at the outlet of the reheating steam loop, carries out subsequent heat exchange, and then sends the mixed heat conduction oil into the condensing and heat collecting system for refueling again, thereby being beneficial to avoiding the waste of heat of the heat conduction oil, ensuring that the temperature of the heat conduction oil at the outlet of the steam generating system is within the heat conduction oil temperature range required by the optimal design point of the condensing and heat collecting system, and having better application effect.
Preferably, the oil quantity at the inlet of the 1 st stage reheater can be adjusted through temperature interlocking, so that the difference between the oil temperature at the outlet of the N-1 st stage reheater and the oil temperature at the outlet of the main circuit preheater is in the range of 0-10 ℃.
According to the control method thought, the invention provides a groove type heat conduction oil steam generation system.
Fig. 2 illustrates a schematic structure of a tank type conduction oil steam generation system according to an exemplary embodiment of the present invention.
As shown in fig. 2, according to an exemplary embodiment of the present invention, the tank type conduction oil steam generation system includes a main steam loop and a reheat steam loop which are arranged in parallel, the reheat steam loop includes M-stage reheaters arranged in series, a conduction oil collecting pipe 4 is arranged between an outlet of the main steam loop and an outlet of an N-1-th stage reheater in the reheat steam loop, the conduction oil collecting pipe 4 collects conduction oil from the outlet of the main steam loop to an outlet of an N-1-th stage reheater 5-N-1 in the reheat steam loop for conducting oil mixing, wherein M is a total number of reheaters in the reheat steam loop, M and N are positive integers, M is greater than or equal to 2, and N is greater than or equal to 2 and less than or equal to M.
The main steam loop comprises a preheater 3, an evaporator 2, a superheater 1 and a control valve (not shown) which are arranged in series, and the feed water sequentially flows through the preheater 3, the evaporator 2 and the superheater 1 and exchanges heat with the heat conduction oil to form superheated steam, wherein the evaporator further comprises a steam-water separator. And the reheat steam loop comprises M-stage reheaters and control valves (not shown) which are arranged in series, and the steam after acting from the steam turbine sequentially flows through the M-stage reheaters 5-M to the 1-stage reheaters 5-1 and exchanges heat with the heat conducting oil to form reheat steam. Wherein, reheat steam circuit and main steam circuit parallelly connected setting.
The heat conduction oil (namely, heat conduction oil) from a condensation heat collection system (not shown) is divided into two branches and respectively enters a main steam loop and a reheat steam loop, the heat conduction oil entering the main steam loop sequentially flows through a superheater 1, an evaporator 2 and a preheater 3 to exchange heat with water and then flows out of an outlet of the main steam loop, the heat conduction oil entering the reheat steam loop sequentially flows through a 1 st-stage reheater 5-1 to an N-1 st-stage reheater 5-N-1 to be mixed with the heat conduction oil from an outlet of the main steam loop after heat exchange is completed, and then the heat conduction oil is sequentially introduced into an N-stage reheater 5-N to an M-stage reheater 5-M through a pipeline and then is sent into the condensation heat collection system to be heated again.
The invention also provides a control method of the groove type heat conducting oil steam generation system, and particularly the heat conducting oil at the outlet of the main steam loop in the groove type heat conducting oil steam generation system is mixed with the heat conducting oil at the outlet of the N-1-th grade reheater 5-N-1 in the reheating steam loop through the heat conducting oil collecting pipeline 4, and then introduced into the inlet of the N-th grade reheater 5-N, and the mixed heat conducting oil is sent into the condensation heat collection system for reheating after completing heat exchange through the N-th grade reheater 5-N to the M-th grade reheater 5-M. Preferably, the oil quantity at the inlet of the 1 st stage reheater can be adjusted through temperature interlocking, so that the difference between the oil temperature at the outlet of the N-1 st stage reheater and the oil temperature at the outlet of the main circuit preheater is in the range of 0-10 ℃.
According to the steam generation system, the heat conduction oil temperature of the N-1 level reheater outlet is approximately equal to that of the main steam loop outlet by controlling the heat conduction oil flow of the reheating steam loop inlet, so that heat waste caused by mixing of heat conduction oils with different oil temperatures is avoided, and the heat utilization efficiency of the evaporation system is more efficient; meanwhile, when the evaporation system is designed and calculated, the heat exchange area of the M-stage heat exchanger of the reheat steam loop can be adjusted, the oil temperature of an outlet of the main steam loop can be properly increased, the heat transfer driving force of each stage of high-pressure heat exchanger of the main steam loop can be increased, the heat exchange area of each stage of high-pressure heat exchanger of the main steam loop can be reduced, the steel consumption of each stage of high-pressure heat exchanger (particularly the evaporator of the high-pressure water vapor shell pass) of the main steam loop can be reduced, and better economic benefit can be obtained compared with that of the traditional groove type photo-thermal power station evaporation system.
The invention will now be described with reference to specific examples.
The tank-type conduction oil steam generation system of the embodiment comprises a main steam loop formed by an evaporator (including a steam-water separator) 2 of a superheater 1, a preheater 3 and related control and regulation meters, and a reheat steam loop formed by a reheater and related control and regulation meters which are connected in series in 2 stages, wherein m=n=2.
During operation, the heat conducting oil is divided into two branches, and the two branches respectively enter a main steam loop (sequentially flow through a superheater 1, an evaporator (containing a steam-water separator) 2 and a preheater 2) to exchange heat with water and a reheat steam loop (sequentially flow through a 1 st-stage reheater to a 3 rd-stage reheater) to exchange heat with acting steam (also called cold reheat steam) from a steam turbine, and the difference between the outlet oil temperature of the 1 st-stage reheater and the outlet oil temperature of the preheater 3 of the main steam loop is controlled within the range of 0-10 ℃ by regulating the inlet oil quantity of the 1 st-stage reheater through temperature interlocking; and then, the heat conduction oil at the outlet of the preheater 3 is mixed with the heat conduction oil at the outlet of the 1 st-stage reheater by using the heat conduction oil collecting pipeline 4, and the mixed heat conduction oil enters the 2 nd-stage reheater for heat exchange, is discharged out of the steam generation system and is sent into the condensing heat collection system for reheating.
In order to embody the advancement of the system, the system and the traditional system are subjected to comparison analysis. The system is provided with 2-stage reheaters, the total flow of heat conduction oil is 1796.6t/h, and the inlet temperature is 419 ℃. By adopting the system of the invention, the temperature of the heat conduction oil outlet of the 2 nd-stage reheater is 303.2 ℃, and the temperature difference between the heat conduction oil and the hydraulic medium is reasonable. By adopting the traditional system, the temperature of the heat conduction oil outlet of the 2 nd-stage reheater is 215.3 ℃ which is lower than the temperature of the hydraulic medium, and heat transfer cannot be performed. For efficient heat transfer, the flow rate of the heat transfer oil must be increased to increase the outlet oil temperature of the heat transfer oil.
Therefore, compared with the traditional system, the system provided by the invention can improve the heat utilization rate of the heat conduction oil, save the consumption of the heat conduction oil and save the construction and operation cost.
The invention is not limited to the specific embodiments described above. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification, as well as to any novel one, or any novel combination, of the steps of the method or process disclosed.
Claims (5)
1. The groove type heat conducting oil steam generation system is characterized by comprising a main steam loop and a reheat steam loop which are arranged in parallel, wherein the reheat steam loop comprises M-stage reheaters which are arranged in series, a heat conducting oil collecting pipeline is arranged between an outlet of the main steam loop and an outlet of an N-1-th-stage reheater in the reheat steam loop, and the heat conducting oil collecting pipeline collects heat conducting oil at the outlet of the main steam loop to an outlet of the N-1-th-stage reheater in the reheat steam loop for conducting oil mixing, wherein M is more than or equal to 2 and N is more than or equal to 2 and less than or equal to M;
the heat conduction oil from the concentrating heat collection system is divided into two branches and respectively enters a main steam loop and a reheat steam loop, the heat conduction oil entering the main steam loop sequentially flows through a superheater, an evaporator and a preheater to exchange heat with water supply and then flows out from an outlet of the main steam loop, the heat conduction oil entering the reheat steam loop sequentially flows through a 1 st-order reheater to exchange heat and then is mixed with the heat conduction oil from an outlet of the main steam loop, and then is sequentially introduced into the N-th-M-th-order reheater through a pipeline to complete heat exchange and then is sent into the concentrating heat collection system for reheating.
2. The tank heat transfer oil steam generation system of claim 1 wherein the main steam circuit comprises a preheater, an evaporator and a superheater arranged in series and a control valve, the feedwater flowing sequentially through the preheater, the evaporator and the superheater for heat exchange with the heat transfer oil to form superheated steam, wherein the evaporator further comprises a steam-water separator.
3. The system of claim 1, wherein the reheat steam circuit comprises M-stage reheaters and control valves arranged in series, and the working steam from the turbine sequentially flows through the M-stage reheaters to the 1-stage reheaters to exchange heat with the heat transfer oil to form reheat steam.
4. The control method of a tank type heat conducting oil steam generating system according to any one of claims 1 to 3, wherein heat conducting oil at an outlet of a main steam loop in the tank type heat conducting oil steam generating system is mixed with heat conducting oil at an outlet of an N-1 th level reheater in a reheat steam loop and then introduced into an inlet of the N-th level reheater, and the mixed heat conducting oil is sent to a condensation heat collecting system for reheating after completing heat exchange sequentially through the N-th level to M-th level reheater, wherein M is a total number of stages of the reheaters in the reheat steam loop, M is more than or equal to 2 and N is less than or equal to 2.
5. The control method of a tank type conduction oil steam generating system according to claim 4, wherein the difference between the outlet oil temperature of the N-1 st stage reheater and the outlet oil temperature of the main circuit preheater is in the range of 0 to 10 ℃ by adjusting the inlet oil amount of the 1 st stage reheater through temperature interlock.
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| CN201910794194.XA CN110425509B (en) | 2019-08-27 | 2019-08-27 | Groove type heat conduction oil steam generation system and control method thereof |
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| CN201910794194.XA CN110425509B (en) | 2019-08-27 | 2019-08-27 | Groove type heat conduction oil steam generation system and control method thereof |
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| CN110425509B true CN110425509B (en) | 2023-10-27 |
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| CN210624486U (en) * | 2019-08-27 | 2020-05-26 | 东方电气集团东方锅炉股份有限公司 | Groove type heat-conducting oil steam generation system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102008051384B3 (en) * | 2008-10-11 | 2010-02-11 | Technische Universität Dresden | Solar-hybrid operated gas and steam power plant has solar plant, gas turbine system and steam turbine system, where heat-carrier circuit is provided for transmitting solar heat |
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| WO2011067345A2 (en) * | 2009-12-04 | 2011-06-09 | Son S.R.L. | Heat recovery steam generator, method for retrofitting a heat recovery steam generator and related process for generating power |
| WO2012045650A2 (en) * | 2010-10-04 | 2012-04-12 | Siemens Aktiengesellschaft | Continuous flow steam generator having an integrated reheater |
| CN203024435U (en) * | 2013-01-11 | 2013-06-26 | 国电龙源电力技术工程有限责任公司 | Side-by-side conduction oil system generated by solar power |
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