CN114018079A - Steam heat storage and release system - Google Patents
Steam heat storage and release system Download PDFInfo
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- CN114018079A CN114018079A CN202111474201.1A CN202111474201A CN114018079A CN 114018079 A CN114018079 A CN 114018079A CN 202111474201 A CN202111474201 A CN 202111474201A CN 114018079 A CN114018079 A CN 114018079A
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- 238000005338 heat storage Methods 0.000 title claims description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 108
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 58
- 238000000034 method Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 22
- 238000009825 accumulation Methods 0.000 claims abstract description 11
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 239000011232 storage material Substances 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 7
- 150000003839 salts Chemical class 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 239000011343 solid material Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 6
- 238000003303 reheating Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000003203 everyday effect Effects 0.000 description 3
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Abstract
The utility model provides a steam heat accumulation, exothermal system, it mainly includes steam heat source, heat accumulator, steam heat transfer device, comdenstion water pressure regulating valve, its main points are: the steam heat source is connected to the superheated steam heat energy heat accumulator through a pipeline, high-temperature steam energy is stored in the superheated steam heat energy heat accumulator, the rest high-temperature steam stores heat energy in the saturated steam heat energy heat accumulator through the steam heat exchange device, and the heat-exchanged high-temperature condensed water is input into the condensed water heat energy heat accumulator through the condensed water pressure regulating valve to form normal pressure water after heat accumulation, so that the heat accumulation process is realized; after the normal pressure water enters the condensed water heat energy heat accumulator for heating through the driving of the water supply pump, the condensed water heat energy heat accumulator enters the steam heat exchange device through the communicating pipeline, heat energy provided by the saturated steam heat energy heat accumulator is absorbed through heat exchange to form saturated steam meeting the pressure requirement, finally the saturated steam enters the superheated steam heat energy heat accumulator through the communicating pipeline for reheating to generate superheated steam meeting the temperature requirement, and the superheated steam is provided for a heat user through the communicating pipeline to use, so that the heat release process is completed.
Description
Technical Field
The invention relates to the technical field of heat storage, in particular to a steam heat storage and release system.
Background
Currently, in the field of thermal storage technology, there are two main application modes: one is a device which optimally utilizes abandoned wind power, abandoned hydropower or power grid off-peak power to prepare heat energy, stores the heat energy in a heat storage material and releases the heat energy to a heat user for use through a heat exchanger when needed; the other is a device which directly stores the surplus high-temperature high-pressure steam in a heat source plant or an industrial production process in a heat storage material and releases the surplus high-temperature high-pressure steam to a heat user through a heat energy output system when needed. The two patents of 'a solid heat storage device with high stability heat storage and high efficiency heat release' (application No. 202110724709.6) and 'a solid heat storage system with controllable steam condensation temperature' (application No. 202111127573.7) which are earlier filed by the applicant are both technologies for solving the heat storage mode, but the systems of the two technologies need to be designed with a large number of auxiliary facilities such as steam tanks and the like, and the system structure is complex. In order to make up for the defects of the technology, a steam heat storage and release system with a new structure is provided on the basis of the technology to optimize a steam heat source heating heat accumulator for heat storage.
Disclosure of Invention
The invention aims to provide a steam heat storage and release system, so as to optimize the steam energy-saving system for performing heat storage and heat energy output utilization on the existing steam heat source heating heat accumulator.
The purpose of the invention is realized by the following technical scheme: a steam heat storage and release system comprises a steam heat source, a heat storage part, a steam heat exchange device, a driving part, a control part, a heat exchange medium supply source, a condensed water pressure regulating valve, a normal-pressure water tank, a heat consumer and a communicating pipeline. The method is characterized in that: the heat storage part consists of a superheated steam heat energy heat accumulator, a saturated steam heat energy heat accumulator and a condensed water heat energy heat accumulator, and each heat accumulator is provided with a transmission metal pipeline with heat storage and release capacity in a heat storage material; the superheated steam heat energy heat accumulator and the condensed water heat energy heat accumulator are built by solid heat accumulation materials. During heat storage, a steam heat source is connected with the upper port of the superheated steam heat energy heat accumulator through a pipeline, the lower port of the superheated steam heat energy heat accumulator is connected with a steam interface of a steam heat exchange device through a pipeline, a condensate water pressure regulating valve connected with a water interface of the steam heat exchange device is connected with the upper port of the condensate water heat energy heat accumulator through a pipeline, and the lower port of the condensate water heat energy heat accumulator is connected with a normal-pressure water tank through a pipeline; an upper port of the saturated steam heat energy heat accumulator is connected with a heat exchange head end of the steam heat exchange device through a pipeline, and a heat exchange medium circulating pump A and a heat exchange medium control valve A are connected between a lower port of the saturated steam heat energy heat accumulator and a heat exchange tail end of the steam heat exchange device in series. When heat is released, the normal-pressure water tank, the water supply pump and the lower port of the condensed water heat accumulator are sequentially connected by a pipeline, the upper port of the condensed water heat accumulator is connected with the water interface of the steam heat exchange device through the pipeline, the steam interface of the steam heat exchange device is connected with the lower port of the superheated steam heat accumulator through the pipeline, and the upper port of the superheated steam heat accumulator is connected with a heat user through the pipeline; the upper port of the saturated steam heat energy heat accumulator is connected with the heat exchange head end of the steam heat exchange device through a pipeline, and a heat exchange medium circulating pump B and a heat exchange medium control valve B are connected in series between the lower port of the saturated steam heat energy heat accumulator and the heat exchange tail end of the steam heat exchange device.
The invention comprises the following steps: the saturated steam heat energy heat accumulator can be configured with different types of heat storage materials, and the type of the heat storage material is a solid material, and can also be molten salt or other phase change heat storage materials.
The invention comprises the following steps: the transmission metal pipelines in the superheated steam heat energy heat accumulator, the saturated steam heat energy heat accumulator and the condensed water heat energy heat accumulator heat accumulation material extend out of two ports of the heat accumulator to form an upper port and a lower port of each heat accumulator.
The invention comprises the following steps: the heat exchange medium is a heat energy transmission carrier of the steam heat exchange system and can be heat conduction substances such as water, heat conduction oil, molten salt and the like which can flow in a pipeline.
The invention comprises the following steps: the transmission metal pipelines in the superheated steam heat energy heat accumulator, the saturated steam heat energy heat accumulator and the condensed water heat energy heat accumulator extend out of two ports of the heat accumulator to form an upper port and a lower port of each heat accumulator.
The invention comprises the following steps: the heat accumulators for storing the superheated steam heat energy, the saturated steam heat energy and the condensed water heat energy can be arranged in a plurality of groups, and when the heat accumulators arranged in the plurality of groups are converted into the heat release working state in the heat storage working state, the working circulation modes of heat exchange media in the pipelines of the upper port and the lower port can be changed.
The invention comprises the following steps: the heat accumulators for storing the superheated steam heat energy, the saturated steam heat energy and the saturated water heat energy can adopt a system working structure for reducing one or two heat accumulators according to the relation between the working parameters of the heat accumulating steam and the working parameters of the heat releasing steam.
The invention comprises the following steps: the hot user can be a superheated steam user, a saturated steam user and a hot water user.
The invention has the advantages that: according to the enthalpy analysis of high-temperature steam, the energy of the overheating stage is generally not more than 15%, the energy of the saturation stage can be generally 70%, and the energy of the preheating stage is generally not more than 15%. The heat accumulator is divided into heat accumulator structures with different working temperature values, namely high, medium and low, the temperature characteristics of a superheating section, a saturation section and a condensation section of steam are fully utilized in the heat accumulation process, and heat energy is stored in a segmented mode to improve the maximization of energy utilization. In the heat release process, firstly, the low-temperature water is heated to high-temperature water by using 15 percent of low-temperature heat energy stored in the condensed water heat energy heat accumulator; then, high-temperature water is heated to saturated steam by using 70% of medium-temperature heat energy stored in the saturated steam heat energy heat accumulator, and the output power of the saturated steam can be changed by adjusting the flow of a heat exchange medium circulating pump B; and then, the saturated steam is heated to the superheated steam by using 15% of high-temperature heat energy stored in the superheated steam heat energy heat accumulators, and the heat energy in each heat accumulator is reasonably utilized in the heat release process to reduce energy waste. If the steam heat source is saturated steam or the system does not need superheated steam for heat release output, the system does not need a superheated steam heat energy heat accumulator; if the steam temperature of the steam heat source is higher than the output steam temperature of the heat consumer and the steam pressure of the steam heat source is lower than the output steam pressure of the heat consumer, the system does not need to be provided with a saturated steam heat energy heat accumulator and a condensed water heat energy heat accumulator, simplifies the structure and reduces the equipment cost.
Drawings
FIG. 1 illustrates the heat storage and release processes for three heat accumulator configurations, each with a single set of structures;
FIG. 2 shows a mode of heat accumulator arrangement, the heat accumulator is divided into two groups for heat accumulation and heat release.
The main components in the attached fig. 1 and 2 are explained as follows: 1. the system comprises a steam heat source, 2, an overheated steam heat accumulator, 2-1, a group of overheated steam heat accumulators, 2-2, a group of overheated steam heat accumulators, 3, a saturated steam heat accumulator, 4, a condensed water heat accumulator, 5, a steam heat exchange device, 6, a heat exchange medium supply source, 7, a normal-pressure water tank, 8, a heat consumer, 9, a pipeline, 10, a heat exchange medium supply pump, 11, a heat exchange medium circulating pump A, 12, a heat exchange medium circulating pump B, 13, a water supply pump, 14, a condensed water pressure regulating valve, 15, a heat storage control valve, 16, a heat release control valve, 17, a heat exchange medium control valve A, 18, a heat exchange medium control valve B, 19, a steam interface, 20, a water interface, 21, a heat exchange head end, 22, a heat exchange tail end, 23 and a temperature and pressure reducing user.
The figures are merely schematic representations of one embodiment of the invention, in which unnumbered elements are numbered the same as their counterparts. To those skilled in the art, other figures may be derived from this figure without inventive effort.
Detailed Description
The following detailed description of the embodiments of the present invention is provided for the purpose of illustration and explanation and is not to be construed as limiting the invention in any way.
FIG. 1 shows the heat storage and release processes of three heat accumulator arrangements, each heat accumulator having a single-group structure;
example 1: as shown in FIG. 1, the working process of the system with three heat accumulators, superheated steam heat energy, saturated steam heat energy and condensed water heat energy, is described.
A heat storage process: the related components in the figure 1 comprise a steam heat source 1, an overheated steam heat accumulator 2, a saturated steam heat accumulator 3, a condensed water heat accumulator 4, a steam heat exchange device 5, a heat exchange medium supply source 6, a normal-pressure water tank 7, a pipeline 9, a heat exchange medium supply pump 10, a heat exchange medium circulating water pump A11, a condensed water pressure regulating valve 14, a heat storage control valve 15, a heat exchange medium control valve A17, a steam interface 19, a water interface 20, a heat exchange head end 21 and a heat exchange tail end 22. The heat storage materials in the superheated steam heat energy heat accumulator 2, the saturated steam heat energy heat accumulator 3 and the condensed water heat energy heat accumulator 4 are provided with transmission metal pipelines with heat storage and release capacities; the heat storage materials in the superheated steam heat energy heat accumulator 2 and the condensed water heat energy heat accumulator 4 are built by solid heat storage materials; in the heat storage process connecting structure, a steam heat source 1 is connected with the upper port of a superheated steam heat energy heat accumulator 2 through a pipeline, the lower port of the superheated steam heat energy heat accumulator 2 is connected with a steam interface 19 of a steam heat exchange device through a pipeline, a pressure regulating valve 14 connected with a water interface 20 of the steam heat exchange device is connected with the upper port of a condensed water heat energy heat accumulator 4 through a pipeline, and the lower port of the condensed water heat energy heat accumulator 4 is connected with a normal-pressure water tank 7 through a pipeline; an upper port of the saturated steam heat energy heat accumulator 3 is connected with the heat exchange head end of the steam heat exchange device 5 through a pipeline, and a heat exchange medium circulating pump A11 and a heat exchange medium control valve A17 are connected in series in a connecting pipeline between a lower port of the saturated steam heat energy heat accumulator 3 and the tail end of the steam heat exchange device 5; the heat release process connecting structure is characterized in that a normal-pressure water tank 7, a water supply pump 13 and a lower port of a condensed water heat accumulator 4 are sequentially connected through pipelines, an upper port of the condensed water heat accumulator 4 is connected with a water interface of a steam heat exchange device 5 through a pipeline, a steam interface of the steam heat exchange device 5 is connected with a lower port of a superheated steam heat accumulator 2 through a pipeline, and a pipeline at an upper port of the superheated steam heat accumulator 2 is connected with a hot user 8 through a heat release control valve 16; the upper port of the saturated steam heat energy heat accumulator 3 is connected with the heat exchange head end of the steam heat exchange device 5 through a pipeline, and a heat exchange medium circulating pump B18 and a heat exchange medium control valve B12 are connected in series between the lower port of the saturated steam heat energy heat accumulator 3 and the pipeline connected with the tail end of the steam heat exchange device 5.
During heat storage, the heat storage control valves 15 are all opened, the heat release control valves 16 are all closed, the steam heat source 1 is connected to the upper port of the superheated steam heat energy heat accumulator 2 through the pipeline 9 to heat the superheated steam heat energy accumulator 2, then the steam heat energy is output from the lower port of the superheated steam heat energy accumulator 2 in a steam heat energy form, and enters the steam heat exchange device 5 through the steam interface 19 to heat a heat exchange medium flowing into the steam heat exchange device 5 from the heat exchange tail end 22. The heated heat exchange medium flows into the upper port of the saturated steam heat energy heat accumulator 3 from the heat exchange head end 21 under the drive of the heat exchange medium circulating water pump a11, and the heat energy released by the steam is stored in the saturated steam heat energy heat accumulator 3. High-temperature condensed water condensed after steam is subjected to heat energy exchange in the steam heat exchange device 5 enters the condensed water heat accumulator 4 for heat storage through the water interface 20, the condensed water pressure regulating valve 14 and the upper port of the condensed water heat accumulator 4, and normal-pressure water formed by cooling the high-temperature condensed water in the condensed water heat accumulator 4 flows into the normal-pressure water tank 7 through the lower port of the condensed water heat accumulator 4 to finish the heat storage process. In the steam heat exchange device 5, a steam interface 19 at the upper part of the equipment is connected with the lower port of the superheated steam heat energy heat accumulator 2 through a pipeline 9; the lower water interface 20 is connected to the condensate pressure regulating valve 14; the heat exchange head end 21 is connected with the upper port of the saturated steam heat energy heat accumulator 3; the heat exchange tail end 22 is connected with a heat exchange medium control valve A17 and a heat exchange medium circulating pump A11. And (3) opening a heat exchange medium control valve A17, wherein the heat exchange medium circularly flows between the steam heat exchange device 5 and the saturated steam heat energy heat accumulator 3 under the driving of a heat exchange medium circulating pump A11, absorbs the heat energy in the steam heat exchange device 5, and is stored in the heat storage material in the saturated steam heat energy heat accumulator 3, so that the heat energy exchange and storage processes are completed. The heat exchange medium supply source 6 and the heat exchange medium supply pump 10 realize the heat exchange medium supply function for a transmission metal pipeline with heat storage and heat release capacity arranged in the saturated steam heat energy heat accumulator 3. The heat exchange medium can be water, or heat conduction oil, molten salt and other heat conduction substances which can flow in the pipeline.
An exothermic process: the parts related to the figure 1 comprise a superheated steam heat energy body 2, a saturated steam heat energy body 3, a condensed water heat energy body 4, a steam heat exchange device 5, a heat exchange medium supply source 6, a normal pressure water tank 7, a heat user 8, a pipeline 9, a heat exchange medium supply pump 10, a heat exchange medium circulating pump B12, a water supply pump 13, a heat release control valve 16, a heat exchange medium control valve 18, a steam interface 19, a water interface 20, a heat exchange head end 21 and a heat exchange tail end 22. When heat is released, the heat release control valve 16 is fully opened, the heat storage control valve 15 is fully closed, water supplied by the normal-pressure water tank 7 enters the condensed water heat energy heat accumulator 4 through the water supply pump 13 for heating, then enters the steam heat exchange device 5 through the water interface 20, heat energy provided by the saturated steam heat energy accumulator 3 is absorbed through heat exchange, saturated steam meeting the pressure requirement is formed, finally, the saturated steam enters the lower port of the superheated steam heat energy accumulator 2 through the steam interface 19, superheated steam meeting the temperature requirement is generated after the superheated steam heat energy accumulator 2 is reheated, and the superheated steam is provided for a heat user 8 through the pipeline 9 to be used, so that the heat release process is realized. In the heat release process, the heat exchange medium control valve A17 is closed, the heat exchange medium control valve B18 is opened, the heat exchange medium circulating pump B12 is started, the heat exchange medium circularly flows between the steam heat exchange device 5 and the saturated steam heat energy accumulator 3 through the heat exchange head end 21 and the heat exchange tail end 22 under the driving force of the heat exchange medium circulating pump B12, and the heat energy stored in the saturated steam heat energy accumulator 3 is exchanged and released in the steam heat exchange device 5.
Example 1: enterprises in an industrial park of Zhejiang require 1.3Mpa and 300 ℃ superheated steam of 1500 tons/hour every 8 hours to 22 hours, and are provided by a gas thermal power plant arranged in the industrial park. This gas thermal power plant adopts with the mode of heat fixed electricity, sends into back pressure type turbo generator set with the high-quality high temperature of gas boiler output, high-pressure superheated steam earlier, for the power supply of garden enterprise, improves the profit of gas thermal power plant with the enterprise's charges of electricity that collects. The exhausted steam discharged by the back pressure type steam turbine generator unit just meets the requirement of 1500 tons of superheated steam every hour in the 14-hour interval from 8 hours to 22 hours every day of a park enterprise, but the steam consumption of the park enterprise in the 10-hour interval from 23 hours to 8 hours every day only needs 60 tons of superheated steam/hour which is less than 5 percent of the steam consumption in the daytime, and the excessively small steam requirement cannot meet the working condition of the back pressure type steam turbine generator unit. During the shutdown period of the back pressure type steam turbine generator unit, a gas thermal power plant starts a low-power gas boiler to supply heat for park enterprises, and the gas thermal power plant bears the loss of 5 million yuan RMB every day due to the fact that no profit is collected in the power generation link. If the inventor installs this system at this gas thermal power plant, utilize the exhaust steam of 7.5Mpa, 500 ℃ that the back pressure turbo generator set electricity generation produced of gas thermal power plant daytime to make steam heat source 1, utilize the mode of figure 1 heat accumulation daytime, the night is exothermic and is exported 1.3Mpa, 10 hours garden enterprise heat supplies are accomplished to overheated steam 60 tons/hour of 300 ℃, can reduce the loss of gas thermal power plant. The peak regulation requirement of heat utilization in industrial parks of China is ubiquitous, and the invention is a good solution.
Example 2: the operation of only two sets of superheated steam thermal energy accumulators disposed within the system is described with reference to fig. 2.
A heat storage process: the parts related to the figure 2 comprise 1 steam heat source, 2-1 one group of superheated steam heat energy accumulators, 2-2 two groups of superheated steam heat energy accumulators, 9 pipelines, 15 heat storage control valves, 16 heat release control valves and 23 temperature and pressure reduction users. During heat storage, the heat storage control valves 15 are all opened, the heat release control valves 16 are all closed, the steam heat source 1 is connected to the upper port of the superheated steam heat energy heat accumulator 2-1 through the pipeline 9 to heat the superheated steam heat energy heat accumulator group 2-1, the lower port of the superheated steam heat energy heat accumulator group 2-1 is conveyed to the upper port of the superheated steam heat energy heat accumulator group 2-2 through the pipeline 9, and the temperature and pressure reducing steam flowing out through the lower port of the superheated steam heat energy heat accumulator group 2-2 after heating the superheated steam heat energy heat accumulator group 2-2 is supplied to a temperature and pressure reducing user to complete the heat storage process.
An exothermic process: the parts related to the figure 2 comprise a first group of superheated steam heat energy accumulators 2-1, a second group of superheated steam heat energy accumulators 2-2, a steam heat exchange device 5, a 7 normal-pressure water tank, 8 heat users, 9 pipelines, 10 heat exchange medium supply pumps, 12 heat exchange medium circulating pumps B, 13 water supply pumps, 16 heat release control valves, 19 steam interfaces, 20 water interfaces, 21 heat exchange head ends and 22 heat exchange tail ends. When heat is released, the heat release control valves 16 are all opened, the heat storage control valves 15 are all closed, water supplied by the normal-pressure water tank 7 enters the water interface 20 through the water supply pump 13 and enters the steam heat exchange device 5, heat exchange absorbs heat energy provided by the superheated steam heat energy bodies in the sub-groups 2-2 to form saturated steam meeting the pressure requirement, finally the saturated steam enters the lower ports of the first sub-group 2-1 of the superheated steam heat energy bodies through the steam interface 19 and is reheated by the first sub-group 2-1 of the superheated steam heat energy bodies to generate superheated steam meeting the temperature requirement, and the superheated steam is provided for a heat user 8 through the pipeline 9 to be used, so that the heat release process is realized. In the heat release process, the heat exchange medium circulating pump B12 is started, the heat exchange medium circularly flows between the steam heat exchange device 5 and the hot steam heat energy accumulator sub-group 2-2 through the heat exchange head end 21 and the heat exchange tail end 22 under the driving force of the heat exchange medium circulating pump B12, and the heat energy stored in the hot steam heat energy accumulator sub-group 2-2 is exchanged and released in the steam heat exchange device 5.
Example 2: 2 x 210MW is installed in a certain thermal power plant in Henan, double throw is realized in 2006, the #2 unit is subjected to the high back pressure transformation of the first 210MW unit in China in 2012, the annual heat supply amount is 900 ten thousand kilojoules, the thermoelectric ratio reaches 170%, and the power supply coal consumption is 269 g/kilowatt hour, so that the unit is a local main power supply and heat source supporting point. In order to improve the efficiency of the operation of the power plant, the pressure is planned to be: 1.2-1.4MPa, temperature: 535 ℃, flow rate: 320t/h, heat storage amount: the waste heat steam heat source of 335MW.h stores heat to generate heat release output pressure: 1.5MPa, temperature: flow rate at 320 ℃: 60 tons of superheated steam. This requirement cannot be achieved using the technical route of fig. 1, since the thermal steam heat source 1 provided by the thermal power plant is pressure: 1.2-1.4MPa, and the vapor pressure of the exothermic output: 1.5MPa, the steam pressure of heat release output is higher than the heat storage steam pressure, so that the temperature released by the heat storage steam heat source 1 in the saturated steam heat energy heat accumulator 3 is lower than the heat release output pressure: the effective heating temperature of saturated steam of 1.5MPa, so the temperature stored in the saturated steam thermal energy heat accumulator 3 of the technical scheme of fig. 1 of example 2 is of no use. If the technical route of fig. 2 is adopted, the temperature: the superheated steam heat energy with the temperature of 535-250 ℃ is stored in a first group 2-1 of the superheated steam heat energy heat accumulator and a second group 2-2 of the superheated steam heat energy heat accumulator, wherein the first group 2-1 of the superheated steam heat energy heat accumulator stores heat energy carried by a steam heat source 1 at the temperature of 535-490 ℃ and is used as a heat source for outputting heat release steam to a heat energy part of about 15% of heat energy required by a superheat section; the superheated steam heat energy heat accumulator is divided into two groups 2-2, stores heat energy carried by the steam heat source 1 at a temperature of 490-250 ℃, is used for releasing heat of a heat energy part of which the temperature is about 85% of that required by the steam output saturation section, and can fully utilize the waste heat of a thermal power plant.
If the upper port of the condensed water heat accumulator 4 in the figure 1 is communicated with the lower port by a pipeline 9, the condensed water heat accumulator 4 is removed; the heat storage control valve 15 is installed on the water interface 20 at the lower part of the steam heat exchange device 5, the temperature and pressure reduction user 23 is additionally arranged in the figure 1, the water interface 20 at the lower part of the steam heat exchange device 5 and the temperature and pressure reduction user 23 are communicated through the pipelines 9 at the two ends of the heat storage control valve 15, the technical route of the figure 1 can be changed into the technical route of the figure 2 by simply connecting the heat storage control valve and the temperature and pressure reduction user 23, one set of equipment can be suitable for various heat storage conditions, and the use flexibility of the system is improved.
The heat storage part is divided into a superheated steam heat energy heat accumulator 2, a saturated steam heat energy heat accumulator 3 and a condensed water heat energy heat accumulator 4, the three heat accumulators with different working temperature values can be designed independently in a split mode, and can also be designed integrally to be designed to be a physical heat insulation partition.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (6)
1. The utility model provides a steam heat accumulation, exothermic system, this system is including heat accumulation and exothermic two kinds of process connection structure, and it mainly includes the steam heat source, superheated steam heat energy heat accumulator, saturated steam heat energy heat accumulator, comdenstion water heat energy heat accumulator, steam heat transfer device, heat transfer medium circulating pump, control flap, heat transfer medium supply pump, heat transfer medium supply source, comdenstion water pressure regulating valve, atmospheric pressure water tank, the working shaft, hot user, pipeline, its characterized in that: the heat storage materials in the superheated steam heat energy heat accumulator, the saturated steam heat energy heat accumulator and the condensed water heat energy heat accumulator are internally provided with a transmission metal pipeline with heat storage and release capacities; the heat storage materials in the superheated steam heat energy heat accumulator and the condensed water heat energy heat accumulator are built by solid heat storage materials; in the heat storage process connecting structure, a steam heat source is connected with an upper port of a superheated steam heat energy heat accumulator through a pipeline, a lower port of the superheated steam heat energy heat accumulator is connected with a steam interface of a steam heat exchange device through a pipeline, a pressure regulating valve connected with a water interface of the steam heat exchange device is connected with an upper port of a condensed water heat energy heat accumulator through a pipeline, and a lower port of the condensed water heat energy heat accumulator is connected with a normal-pressure water tank through a pipeline; an upper port of the saturated steam heat energy heat accumulator is connected with a heat exchange head end of the steam heat exchange device through a pipeline, and a heat exchange medium circulating pump A and a heat exchange medium control valve A are connected in series in a connecting pipeline between a lower port of the saturated steam heat energy heat accumulator and a tail end of the steam heat exchange device; the heat release process connecting structure is characterized in that a normal-pressure water tank, a water supply pump and a lower port of a condensed water heat accumulator are sequentially connected through pipelines, an upper port of the condensed water heat accumulator is connected with a water interface of a steam heat exchange device through a pipeline, a steam interface of the steam heat exchange device is connected with a lower port of an overheated steam heat accumulator through a pipeline, and a pipeline at an upper port of the overheated steam heat accumulator is connected with a heat user through a heat release control valve; an upper port of the saturated steam heat energy heat accumulator is connected with the heat exchange head end of the steam heat exchange device through a pipeline, and a heat exchange medium circulating pump B and a heat exchange medium control valve B are connected in series between a lower port of the saturated steam heat energy heat accumulator and the pipeline connected with the tail end of the steam heat exchange device.
2. The steam heat storage, release system of claim 1, wherein: the heat storage material is configured for the saturated steam heat energy heat accumulator; the type of the material is solid material and fused salt phase change heat storage material.
3. The steam heat storage, release system of claim 1, wherein: the transmission metal pipelines in the superheated steam heat energy heat accumulator, the saturated steam heat energy heat accumulator and the condensed water heat energy heat accumulator heat accumulation material extend out of two ports of the heat accumulator to form an upper port and a lower port of each heat accumulator.
4. The steam heat storage, release system of claim 1, wherein: the heat exchange medium is a heat energy transmission carrier of the steam heat exchange device and is a heat conduction substance through which water, heat conduction oil or molten salt can flow in the pipeline.
5. The steam heat storage, release system of claim 1, wherein: the heat accumulator for storing superheated steam heat energy, the heat accumulator for saturated steam heat energy and the heat accumulator for condensed water heat energy are arranged in a group, two groups or more than two groups, and when the heat accumulators arranged in the groups are converted into a heat release working state in a heat storage working state, the working circulation modes of heat exchange media in the upper port pipeline and the lower port pipeline can be changed.
6. The steam heat storage, release system of claim 1, wherein: the hot users refer to superheated steam users, saturated steam users or/and hot water users.
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