CN107702358B - Method for flushing high-temperature-resistant solid heat storage system by evaporating water - Google Patents
Method for flushing high-temperature-resistant solid heat storage system by evaporating water Download PDFInfo
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- CN107702358B CN107702358B CN201710810492.4A CN201710810492A CN107702358B CN 107702358 B CN107702358 B CN 107702358B CN 201710810492 A CN201710810492 A CN 201710810492A CN 107702358 B CN107702358 B CN 107702358B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
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Abstract
The invention relates to the technical field of solid-state energy storage, in particular to a method for flushing distilled water of a high-temperature-resistant solid-state heat storage system, which comprises the steps of continuously adding water into a pipeline of a solid-state heat storage medium, controlling the temperature of the added water to gradually rise, and realizing the synchronous operation of pipeline flushing and solid-state heat storage medium heat exchange temperature rise distilled water; and when the temperature of the solid heat storage medium is raised to the set temperature, stopping adding water, continuously introducing high-temperature steam into the pipeline of the solid heat storage medium, and continuing to heat and dry the solid heat storage medium. By adopting the method, water is firstly introduced, then steam is introduced, when high-temperature steam is introduced, the solid heat storage medium is heated by the water to a certain temperature, and the solid heat storage medium is not cracked due to rapid heating when the high-temperature steam is introduced, so that the solid heat storage medium is prevented from being damaged; meanwhile, when water is introduced to evaporate the solid heat storage medium, the water can also flush the pipeline, impurities in the pipeline can be flushed and discharged, and conditions are created for subsequent purging.
Description
Technical Field
The invention relates to the technical field of solid-state energy storage, in particular to a method for flushing distilled water of a high-temperature-resistant solid-state heat storage system.
Background
The solar photo-thermal power generation has the advantages that an expensive silicon crystal photoelectric conversion process can be avoided, the cost of solar power generation can be greatly reduced, and the heat energy converted by solar energy can be stored, so that power generation can be continued even after the sun falls off a mountain or in a rainy weather environment.
The heat storage tower of the solar photo-thermal power station is a heat storage module for storing heat energy. When energy is stored, hot steam is introduced into the heat storage tower, and the hot steam and a heat storage medium (concrete) complete heat exchange through a pipe bundle in the heat storage tower, so that condensed water is discharged; when energy is supplied, water is introduced into the heat storage tower, the water exchanges heat with heat energy stored in the heat storage tower, and finally hot steam is discharged.
Concrete is used as a common heat storage medium and widely applied to a heat storage module of a solar photo-thermal power station, and the structure of the solar photo-thermal power station is that a pipeline penetrates into the concrete, fins are arranged on the outer wall of the pipeline and are in contact with the concrete, when the solar photo-thermal power station is used, hot steam is introduced into the pipeline, and the heat exchange between the hot steam and the concrete is completed through the assistance of the fins.
The heat storage module is easy to retain various impurities such as gravel, welding slag and corrosion products in the process of manufacturing, transporting, storing, installing and the like, the impurities are required to be cleaned before use, meanwhile, the concrete is required to be dried before being put into use formally, the drying mainly means is to heat the impurities to ensure that free water (evaporated at 110 ℃ below zero) and crystal water (separated out at more than 300 ℃) in the concrete escape, and the cracking of the concrete caused by uneven expansion after the concrete is heated suddenly and at the low temperature and the damp in use is avoided.
At present, the two operations are step-by-step operations, and hot water is introduced into a concrete pipeline during washing, so that impurities in the pipeline are washed out by the water; during drying, high-temperature gas is introduced into the pipeline, the temperature of the gas is generally about 420-. The two steps are operated step by step, time and labor are wasted, the initial temperature of the concrete during drying is lower and is about 20 ℃, and under the general condition, the temperature of the dried concrete is 300-450 ℃, the front temperature span and the rear temperature span are large, the concrete is rapidly heated during the drying process, and the concrete is easily cracked, so that the normal use of the heat storage tower is influenced.
Disclosure of Invention
The invention provides a method for flushing distilled water of a high-temperature-resistant solid heat storage system, which aims to realize simultaneous flushing of a solid heat storage medium and water evaporation, wherein the solid heat storage medium is firstly steamed by gradually-heated water, and then high-temperature steam is introduced to avoid cracking of the solid heat storage medium.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for flushing distilled water of a high-temperature-resistant solid heat storage system comprises the following steps:
continuously adding water into the pipeline of the solid heat storage medium, and controlling the temperature of the added water to gradually rise, so as to realize the synchronous operation of pipeline flushing and solid heat storage medium heat exchange water distillation;
discharging the water subjected to flushing and heat exchange water distillation from the tail end of the pipeline to the solid heat storage medium;
and when the temperature of the solid heat storage medium is raised to a set temperature, stopping adding water, continuously introducing high-temperature steam into the pipeline of the solid heat storage medium, and continuing to heat and dry the solid heat storage medium.
Further, the solid heat storage medium is concrete, solid salt, ceramic or solid sand
Furthermore, the solid heat storage medium is concrete, water added into the pipeline of the concrete is added from the top layer of the concrete, the water is discharged from the bottom of the concrete after washing and heat exchange water evaporation are completed, and the initial temperature of the added water is higher than the temperature of the top layer of the concrete.
Further, the concrete is heated to a set temperature after the temperature of the concrete on the layer where the steam-water separator is located in the concrete reaches 200-300 ℃.
Further, the temperature range of the added water is 80-270 ℃, and the temperature range of the introduced steam is 350-480 ℃.
Further, in the drying operation, the drying operation is stopped when the temperature of the concrete at the bottommost part reaches 270 ℃.
Furthermore, water added into the pipeline of the concrete is subjected to heat exchange and temperature rise by steam generated by the solar island of the power station, and the steam added into the pipeline of the concrete is the steam generated by the solar island of the power station.
Further, a temporary system is built, wherein the temporary system comprises a high-pressure heat exchanger, and the high-pressure heat exchanger is connected with a heat collection circulating water pump and a steam output pipeline of the power station through a temporary pipeline;
and exchanging heat between water in a heat collection circulating water tank of the power station and steam generated by a solar island of the power station in a high-pressure heat exchanger of the temporary system, wherein the high-pressure heat exchanger adds high-temperature water subjected to heat exchange to the upper part of a concrete pipeline of the heat storage tower.
And further, recovering water discharged from the bottom of the concrete, and conveying the water to a heat collection circulating water tank of a power station after filtering.
Further, when the temperature of the added water is within the range of 100-110 ℃, the water in the temperature range stays in the pipeline of the concrete for 72-168 hours, and then the concrete is sampled, and the sampled sample is dried and weighed.
According to the technical scheme, the method for flushing the high-temperature-resistant solid heat storage system by the distilled water mainly comprises two steps, wherein in the first step, water is added into a pipeline of the solid heat storage medium, and the water has a certain temperature and exchanges heat with the solid heat storage medium to evaporate the water in the solid heat storage medium; the temperature of the added water is continuously increased, so that the temperature of the solid heat storage medium is gradually increased, and the aim of evaporating the solid heat storage medium is finally fulfilled; and then, in the second step, steam is introduced into the pipeline of the solid heat storage medium, the temperature of the steam is higher, and the solid heat storage medium is further subjected to water evaporation and drying.
By adopting the method, because the water is firstly introduced and then the steam is introduced, when the high-temperature steam is introduced, the solid heat storage medium is heated to a certain temperature by the water, and the water is evaporated and dried for a period of time, the solid heat storage medium can not be cracked due to rapid heating when the high-temperature steam is introduced, and the solid heat storage medium is prevented from being damaged; meanwhile, when water is introduced to evaporate the solid heat storage medium, the pipeline can be flushed, impurities in the pipeline can be flushed and discharged, and conditions are created for subsequent purging.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a first embodiment of a method for flushing distilled water from a heat storage tower according to the present invention;
fig. 2 is a flowchart of a second embodiment of the method for flushing distilled water from a heat storage tower according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The method for flushing distilled water provided in this embodiment can dry the solid heat storage medium of the heat storage device, and can gradually raise the temperature of the solid heat storage medium in a manner of combining water and steam, and specifically, the method for flushing distilled water of the high-temperature-resistant solid heat storage system includes the following steps:
continuously adding water into the pipeline of the solid heat storage medium, and controlling the temperature of the added water to gradually rise, so as to realize the synchronous operation of pipeline flushing and solid heat storage medium heat exchange water distillation;
discharging the water subjected to flushing and heat exchange water distillation from the tail end of the pipeline to the solid heat storage medium;
and when the temperature of the solid heat storage medium is raised to a set temperature, stopping adding water, continuously introducing high-temperature steam into the pipeline of the solid heat storage medium, and continuing to heat and dry the solid heat storage medium.
Preferably, the solid heat storage medium is concrete, solid salt, ceramic or solid sand. The following two embodiments take concrete as the solid heat storage medium, specifically:
in one embodiment, as shown in fig. 1, a method for flushing distilled water of a high-temperature-resistant solid-state heat storage system includes the following steps:
continuously adding water into a pipeline of the concrete of the heat storage tower, and controlling the temperature of the added water to gradually rise so as to realize the synchronous operation of pipeline flushing and concrete heat exchange water evaporation;
discharging the water after the washing and the heat exchange water distillation from the tail end of the pipeline out of the heat storage tower;
and after the temperature of the concrete is raised to the set temperature, stopping adding water, continuously introducing high-temperature steam into the pipeline of the concrete of the heat storage tower, and continuing to heat and dry the concrete.
And raising the temperature of the concrete to the set temperature, wherein the temperature of the concrete on the layer where the steam-water separator is arranged in the heat storage tower reaches 200-300 ℃. The purpose of water flowing in the concrete pipeline is to gradually heat the concrete, so that the concrete is prevented from cracking due to sudden high temperature, when the temperature of the concrete on the layer where the steam-water separator is located is raised to 200-300 ℃, generally 14 layers are stopped, and the operation is switched to steam flowing.
In operation, water/steam added into the pipeline of the concrete of the heat storage tower is added from the top layer of the heat storage tower, the water/steam is discharged from the bottom of the heat storage tower after washing and heat exchange water evaporation are finished, and the initial temperature of the added water is higher than the temperature of the concrete at the topmost layer in the heat storage tower.
Preferably, the temperature range of the added water is 80-270 ℃, and the temperature range of the introduced steam is 350-480 ℃.
When the temperature of concrete at the top of the heat storage tower is below 55 ℃, controlling the temperature of added water not to exceed 80 ℃, and controlling the temperature difference between the water entering the heat storage tower and the temperature of the top layer of the heat storage tower to be within 25 ℃ along with continuous water addition when the temperature at the top of the heat storage tower exceeds 55 ℃; the added water is controlled by a water feeding pump, and when the temperature of concrete at the top of the heat storage tower is above 80 ℃, the water feeding pump is controlled to output power according to the flow velocity of water in each pipeline, which is more than 1.5m/s, so that the stability and relative balance of the added water, the water discharge effect, the flushing effect and the heating rate of the heat storage tower are ensured.
And (4) introducing steam to continue drying the concrete, and stopping drying when the temperature of the concrete at the bottommost part of the heat storage tower reaches 270 ℃. The concrete structure of the heat storage tower comprises a multi-layer structure, generally comprises 18 layers, in two steps, high-temperature water and steam are introduced from the top, the bottom is discharged, in the process of water/steam flowing heat exchange and water evaporation, heat exchange is completed layer by layer, the temperature of the bottom is lower than that of the top, therefore, when the temperature of the bottom reaches 270 ℃, corresponding reasoning can be carried out, the temperature of the top is higher than 270 ℃, and therefore, only the temperature of the bottommost concrete can be monitored.
In the second embodiment, as shown in fig. 2, for the water and steam added into the concrete pipeline, the water and steam can be supplied by external equipment, or the water and steam can be supplied by using the existing structure of the power station.
Specifically, a temporary system is built, wherein the temporary system comprises a high-pressure heat exchanger, and the high-pressure heat exchanger is connected with a heat collection circulating water pump and a steam output pipeline of a power station through a temporary pipeline;
and exchanging heat between water in a heat collection circulating water tank of the power station and steam generated by a solar island of the power station in a high-pressure heat exchanger of the temporary system, wherein the high-pressure heat exchanger adds high-temperature water subjected to heat exchange to the upper part of a concrete pipeline of the heat storage tower.
A heat collection circulating water pump of the power station conveys water in a heat collection circulating water tank to a high-pressure heat exchanger, high-temperature steam generated by heat absorption of a mirror field is conveyed to the high-pressure heat exchanger, the water in the high-pressure heat exchanger exchanges heat with the steam, and the water is discharged and conveyed to the upper part of a concrete pipeline of the heat storage tower after being heated. Wherein, the temperature of the high-pressure heat exchanger outputting high-temperature water can be adjusted by adjusting the temperature of the water in the heat collecting circulation water tank.
Before the temporary system lets in water in the concrete, need to carry out the exhaust, washing treatment to temporary system's high-pressure heat exchanger and corresponding pipeline, include discharge valve and trap on temporary system's the pipeline, when exhausting, washing treatment, open discharge valve and trap to the water of passing through in high-pressure heat exchanger and the pipeline of being connected with it with minimum frequency, take the discharge valve to close discharge valve after having continuous water droplet, the trap exhaust water turns to the colorless transparent and then closes, stops supplying water simultaneously. In the process, the pressure in the temporary pipeline does not exceed 4 MPa.
After the exhaust treatment, water can be added into the concrete pipeline, water is continuously added into the concrete pipeline of the heat storage tower, and the temperature of the added water is controlled to be gradually increased, so that the pipeline flushing and the concrete heat exchange distilled water are synchronously carried out;
discharging the water after the washing and the heat exchange water distillation from the tail end of the pipeline out of the heat storage tower;
and after the temperature of the concrete is raised to the set temperature, stopping adding water, continuously introducing high-temperature steam into the pipeline of the concrete of the heat storage tower, and continuing to heat and dry the concrete.
The heat storage tower comprises a plurality of modules, each module comprises a plurality of layers, for example, the heat storage tower is composed of 6 modules, each module comprises 18 layers, and all the layers and all the seats are communicated with each other.
And under the state that the concrete pipeline is full of water, the internal pressure of the concrete pipeline is 4-5 MPa. When the device is used, if the water quantity in the heat storage tower is enough, the drain outlets of the 6 heat storage towers can be opened simultaneously, if the water quantity is not enough, the drain outlets are alternately opened and closed, and the opening time of the drain outlets is basically the same. Wherein, the pressure in the heat storage tower can be kept within the range, which proves that the water quantity is sufficient, otherwise, the water quantity is insufficient.
The sewage discharge amount of a single-seat tower of the heat storage tower is not lower than 85t/h, and when 6 seats discharge sewage simultaneously, the total sewage discharge amount is not lower than 510t/h, so that the flow rate of water in the heat storage tower is not lower than 1.5 m/s.
In a further preferred technical scheme, water discharged from the bottom of the heat storage tower is recycled. In the heat storage tower washing process, earlier stage heat storage tower drain exhaust water is comparatively muddy, and after a period of time, drain exhaust water can be limpid gradually, and when the exhaust water reaches certain standard, recycle avoids the wasting of resources, practices thrift the cost. Preferably, the water discharged from the bottom of the heat storage tower is collected and tested periodically, for example, every 2 hours, and when the content of chloride ions in the discharged water is less than 25ppm and the content of total iron in the discharged water is less than 50mg/L, the discharged water is recycled.
Meanwhile, the recycled water discharged by the heat storage tower is recycled to the heat collection circulating water tank, so that the heat storage tower, the heat collection circulating water tank and the high-pressure heat exchanger form a closed circulating structure. The steam quantity entering the high-pressure heat exchanger is controlled by controlling the loop quantity and the control mode of the mirror field input, the input quantity and the frequency of the heat collection circulating water pump are controlled at the same time, the water temperature entering the heat storage tower from the outlet of the high-pressure heat exchanger is higher than the temperature of the top layer of the heat storage tower and has larger circulating quantity at the same time, so that the water flow speed in the heat storage tower is enough, the integral temperature equalization of concrete in the heat storage tower is facilitated under the condition that the flow speed in the heat storage tower is enough, and the temperature difference between the top and the bottom is avoided to be larger.
In the first and second embodiments, during the continuous water adding process, when the temperature of the added water is in the interval of 100-. The primary water evaporation drying stage mainly evaporates the free water in the concrete, wherein the temperature range of the free water evaporation is between 100 ℃ and 110 ℃, so that the free water can be fully evaporated after sufficient time is remained in the temperature range.
The concrete sampling mode is that samples at two edges and the middle part of the concrete are collected, the weight of the collected samples is not less than 30g, and the drying and heating temperature is not less than 600 ℃. The total weight of the heated sample was found to be acceptable within 6% reduction (about 6% crystal water content in concrete).
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (4)
1. A method for flushing distilled water of a high-temperature-resistant solid heat storage system is characterized by comprising the following steps:
continuously adding water into a pipeline of the solid heat storage medium, and controlling the temperature of the added water to gradually rise to realize synchronous operation of pipeline flushing and solid heat storage medium heat exchange water distillation, wherein the temperature range of the added water is 80-270 ℃;
discharging the water subjected to flushing and heat exchange water distillation from the tail end of the pipeline to the solid heat storage medium;
when the temperature of the solid heat storage medium is raised to a set temperature, stopping adding water, continuously introducing high-temperature steam into a pipeline of the solid heat storage medium, continuing to heat and dry the solid heat storage medium, and stopping drying when the temperature of the bottommost part of the concrete reaches 270 ℃;
heating the concrete to a set temperature, wherein the temperature of the concrete on the layer where the steam-water separator is located in the concrete reaches 200-300 ℃;
the temperature range of the introduced high-temperature steam is 350-480 ℃;
the solid heat storage medium is concrete, solid salt, ceramic or solid sand;
the solid heat storage medium is concrete, water/steam added into a pipeline of the concrete is added from the top layer of the concrete, the water/steam is discharged from the bottom of the concrete after flushing and heat exchange water evaporation are finished, and the initial temperature of the added water is higher than the temperature of the concrete at the topmost layer;
when the temperature of the top of the concrete exceeds 55 ℃, controlling the temperature difference between the temperature of the water entering the concrete and the temperature of the top layer of the concrete to be within 25 ℃, when the temperature of the added water is within the interval of 100-110 ℃, the water in the temperature interval stays in the pipeline of the concrete for 72-168 hours, then sampling the concrete, and drying and weighing the sampled sample.
2. The method of claim 1, wherein the water added to the concrete pipeline is heated by heat exchange with steam generated by the solar island of the power station, and the steam added to the concrete pipeline is steam generated by the solar island of the power station.
3. The method for flushing the distilled water of the high-temperature-resistant solid heat storage system according to claim 2, wherein a temporary system is built, the temporary system comprises a high-pressure heat exchanger, and the high-pressure heat exchanger is connected with a heat collection circulating water pump and a steam output pipeline of a power station through a temporary pipeline;
and exchanging heat between water in a heat collection circulating water tank of the power station and steam generated by a solar island of the power station in a high-pressure heat exchanger of the temporary system, wherein the high-pressure heat exchanger adds the high-temperature water subjected to heat exchange to the upper part of the concrete pipeline.
4. The method of claim 3 wherein water drained from the bottom of the concrete is recovered and filtered before being sent to a heat collection circulation tank of a power station.
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| CN201225645Y (en) * | 2008-03-14 | 2009-04-22 | 陈海渊 | Thermal storage precast block |
| CN102032823A (en) * | 2010-11-23 | 2011-04-27 | 中国科学院电工研究所 | Solar high-temperature heat storage system with solid heat storage medium |
| CN103017585B (en) * | 2011-09-23 | 2015-01-28 | 北京兆阳光热技术有限公司 | Phase change heat exchange device |
| CN104713397B (en) * | 2013-12-16 | 2016-08-17 | 北京兆阳光热技术有限公司 | A kind of solid heat reservoir |
| US20160193545A1 (en) * | 2014-09-12 | 2016-07-07 | Tibet Jinrui Asset Management Co., Ltd. | Method and System for High-Efficiency Heat Energy Recycling Applicable to Plateau Areas Using a High-Temperature Concentrated Solar Thermal Collector |
| CN204955082U (en) * | 2015-09-14 | 2016-01-13 | 昆明小街水泥制品有限公司 | Cement pipe heat setting equipment |
| CN106182378A (en) * | 2016-08-02 | 2016-12-07 | 湖南聚创建筑科技有限公司 | A kind of steam curing system |
| CN107053446A (en) * | 2017-02-09 | 2017-08-18 | 天津港航工程有限公司 | The steam protecting method of high frost resistance barrier board rapid shaping |
| CN107013047B (en) * | 2017-03-22 | 2020-03-20 | 中交武汉港湾工程设计研究院有限公司 | Gradient type concrete water pipe control system and control method |
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