CN109489276B - Step type gravity salt-discharging type heat collection field and salt-discharging method - Google Patents
Step type gravity salt-discharging type heat collection field and salt-discharging method Download PDFInfo
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- CN109489276B CN109489276B CN201710809237.8A CN201710809237A CN109489276B CN 109489276 B CN109489276 B CN 109489276B CN 201710809237 A CN201710809237 A CN 201710809237A CN 109489276 B CN109489276 B CN 109489276B
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- 238000007599 discharging Methods 0.000 title claims abstract description 86
- 230000005484 gravity Effects 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims description 16
- 238000013461 design Methods 0.000 claims abstract description 6
- 150000003839 salts Chemical class 0.000 claims description 165
- 238000007789 sealing Methods 0.000 claims description 49
- 210000001503 joint Anatomy 0.000 claims description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- 230000006835 compression Effects 0.000 claims description 10
- 238000007906 compression Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 238000010926 purge Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 4
- 230000008602 contraction Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
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- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
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- -1 this in whole degree Chemical class 0.000 description 1
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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
- Y02E10/47—Mountings or tracking
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Abstract
The invention discloses a stepped gravity salt-discharging type heat collection field, which comprises a cold tank, a first trough type heat collector, a bridge section connecting pipe, a second trough type heat collector and a heat tank which are sequentially communicated, wherein the first trough type heat collector comprises a plurality of sub-trough type heat collectors, and heat collection pipes of the sub-trough type heat collectors of the first trough type heat collector are respectively arranged in parallel with a horizontal plane and are gradually raised along the direction far from the cold tank. The heat collection field of the invention continues the conventional design of adopting the whole horizontal plane, but the height of two adjacent sub-groove heat collectors is changed by utilizing the arrangement of the base station, the structure, the assembly form and the operation of each sub-groove heat collector are not affected, the heat collection pipes are also arranged horizontally, but a plurality of heat collection pipes of one groove heat collector form the height difference, the whole occupied area is reduced, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of photo-thermal electricity, in particular to a stepped gravity salt-discharging type heat collection field and a salt-discharging method.
Background
In the prior art, a trough type solar thermal power generation system adopting a molten salt medium comprises two groups of trough type heat collectors, a salt water heat exchanger, a steam turbine generator, a cold tank, a hot tank and a molten salt discharging system; the groove type heat collector consists of a plurality of independent sub-groove type heat collectors, each sub-groove type heat collector comprises a supporting arm rotatably arranged on a base frame, a reflecting silver mirror fixedly connected with the supporting arm and a heat collecting pipe arranged at the focus of the reflecting silver mirror, the heat collecting pipes of the plurality of sub-groove type heat collectors of each group of groove type heat collectors are sequentially connected in series, two groups of groove type heat collectors are arranged in parallel front and back, one end of each groove type heat collector is connected and communicated through a bridge section connecting pipe, the other end of each groove type heat collector is respectively communicated with a cold tank or a hot tank through a pipeline, and meanwhile, the hot tank is communicated with the cold tank after passing through a pipeline or a salt water heat exchanger, so that a loop is formed.
However, the existing heat collection field has a round trip length of 800m because of large field, and when the conditions of overhauling, molten salt pump faults, valve or flange, salt leakage of rotary joints and the like are faced, molten salt in a pipeline is required to be discharged cleanly, and how to discharge salt rapidly and effectively becomes a problem to be solved continuously.
Disclosure of Invention
The invention aims at solving the technical defects existing in the prior art and provides a stepped gravity salt-discharging type heat collection field and a salt-discharging method.
The technical scheme adopted for realizing the purpose of the invention is as follows:
the utility model provides a bench type gravity salt drainage formula heat collection field, includes cold tank, first slot type heat collector, bridge section connecting pipe, second slot type heat collector and the heat tank that communicates in proper order, wherein, first slot type heat collector include a plurality of sub-slot type heat collectors, the heat-collecting tube of a plurality of sub-slot type heat collectors of first slot type heat collector respectively with horizontal plane parallel arrangement and along keeping away from cold tank direction height step-by-step, the heat-collecting tube of a plurality of sub-slot type heat collectors of second slot type heat collector respectively with horizontal plane parallel arrangement and along being close to the direction height step-by-step of heat tank, at least the base that corresponds of first slot type heat collector and bridge section connecting pipe adjacent sub-slot type heat collector be higher than the corresponding base of second slot type heat collector, connect the admission valve in the bridge section side with the correspondence of first slot type heat collector the connecting pipe tip of first slot type heat collector the low point of first slot type heat collector and the low salt of second slot type heat collector have the salt drainage side of connecting pipe respectively below the branch pipe of the salt drainage of first slot type heat collector.
The base platform is formed at the bottom of the base frame of the sub-tank type heat collector to form the height difference, and the height difference of the base platform corresponding to the adjacent sub-tank type heat collector is 20-50cm.
The salt discharging branch pipe is perpendicular to the connecting pipe or is a vertically arranged connecting pipe, a high-temperature corrugated pipe end fixedly connected with the connecting pipe, and a connecting flange fixedly arranged at the end part of the high-temperature corrugated pipe.
And a temperature sensor is arranged on the guide tube of the salt discharging branch tube or a connecting tube connected with the guide tube.
The salt dredging tank comprises a salt storage tank, a salt inlet pipe arranged at the top of the salt storage tank, an air inlet pipe connected with the salt inlet pipe in a bypass mode, and a salt discharging pipe communicated with the bottom of the salt storage tank, wherein a salt inlet control valve is arranged at the upper portion of a bypass point of the salt inlet pipe and a sealing flange is fixedly arranged at the end portions of the salt inlet pipe and the salt discharging pipe in a detachable mode.
The salt discharging tank comprises a cylindrical tank body, cover plates fixedly arranged at two ends of the tank body, a support is arranged at the bottom of the tank body, lifting lugs are arranged at two ends of the top of the tank body, the bottom of the tank body is conical, a salt discharging pipe is arranged at the bottom inlet and is arranged at the bottom lowest position, the salt discharging pipe is L-shaped, a horizontal section of the bottom of the salt discharging pipe is fixedly connected with and communicated with the bottom of the tank body, and a vertical section of the salt discharging pipe is positioned outside the tank body and extends upwards to the top of the tank body.
The first groove type heat collector and the second groove type heat collector respectively comprise a plurality of sub groove type heat collectors, rotary joints communicated by high-temperature corrugated pipes are respectively arranged between heat collecting pipes of the sub groove type heat collectors and between the heat collecting pipes and a cold tank or a hot tank, each rotary joint comprises a connecting outer cylinder and two inner cylinders, each inner cylinder comprises a connecting guide pipe, one end of each connecting guide pipe is fixedly connected with the corresponding high-temperature corrugated pipe, a butt joint corrugated pipe is fixedly arranged at the other end of each connecting guide pipe, sealing rings are fixedly arranged at the end parts of the butt joint corrugated pipes, sealing rings of the corresponding two inner pipes are arranged inside the corresponding connecting outer cylinders in a sealing contact mode, and the connecting guide pipes are respectively and fixedly connected with the corresponding connecting outer cylinders in a rotatable mode and enable the corresponding sealing rings to keep preset pressure.
The connecting tube is provided with a positioning step, a shaft sleeve or a bearing is sleeved at the positioning step, and a compression ring fixedly connected with the connecting outer tube is propped against the bearing or the shaft sleeve to compress the two sealing rings.
The salt discharging method of the step type gravity salt discharging type heat collecting field comprises the following steps,
1) Closing the cold salt pump, buckling the first groove type heat collector and the second groove type heat collector,
the butt-buckling means that the pipe is turned to the lowest position, sunlight is not received at the angle, and the condition that the temperature is too high due to the fact that the content of the pipe is small is avoided.
2) When no molten salt flows in the hot tank, the molten salt inlet of the hot tank is closed, the air inlet valve is opened, the salt discharging branch pipe is opened, the molten salt enters the salt dredging tank under the gravity,
3) When the flow is reduced, the relative salt discharging branch pipe is gradually lifted from far to near, and when the temperature sensed by the temperature sensor is lower than 300 ℃, salt discharging is stopped or the first groove type heat collector or the second groove type heat collector is rotated to reheat.
Also included is a process of purging the inside of the tube with high temperature nitrogen.
Compared with the prior art, the invention has the beneficial effects that:
the heat collection field of the invention continues the conventional design adopting the whole horizontal plane, but the arrangement of the base station changes the height of two adjacent sub-groove heat collectors, the structure, the assembly form and the operation of each sub-groove heat collector are not affected, the heat collection pipes are also kept horizontally arranged, but a plurality of heat collection pipes of one groove heat collector form the height difference, and the height difference is formed between the two groups of sub-groove heat collectors, so that the bridge section connecting pipe and the horizontal plane office have certain inclination, the whole device has a unique highest point and two relatively low points, an air inlet is arranged at the high point, a salt discharge branch pipe is arranged at the low point, gravity salt discharge can be realized by utilizing the inclination angle, meanwhile, the inclined arrangement is preferably east-low-west high, so that the heat collection field has better sun-facing angle, and simultaneously, the two groups of groove heat collectors adopt different height arrangements, thereby reducing the mutual influence, effectively reducing the distance between the two groups of groove heat collectors, reducing the whole occupied area and saving the cost.
Drawings
Fig. 1 is a schematic diagram of a part of a gravity salt discharging device of a heat collecting field.
Fig. 2 is a schematic structural view of the salt-repellent tank for salt elimination in the field of view of the present invention.
Fig. 3 is a schematic side view of fig. 2.
Fig. 4 is a schematic view of a rotary joint.
Detailed Description
The invention is described in further detail below with reference to the drawings and the specific examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in the figure, the stepped gravity salt-discharging type heat collection field of the present invention comprises a cold tank, a first trough type heat collector 130, a bridge section connecting pipe 110, a second trough type heat collector and a heat tank which are sequentially communicated, wherein the first trough type heat collector comprises a plurality of sub-trough type heat collectors, the heat collecting pipes of the first trough type heat collector are respectively arranged in parallel with a horizontal plane and gradually rise along the direction far from the cold tank, the heat collecting pipes of the second trough type heat collector are respectively arranged in parallel with the horizontal plane and gradually fall along the direction close to the heat tank, at least the base corresponding to the sub-trough type heat collector adjacent to the bridge section connecting pipe of the first trough type heat collector is higher than the corresponding base 100 of the corresponding second trough type heat collector, an air inlet valve 120 is connected at the end of the bridge section connecting pipe corresponding to the first trough type heat collector, and salt is respectively arranged at the side of the low point of the connecting pipe of the first trough type heat collector and the side of the second trough type heat collector, and salt is respectively arranged at the side of the salt-discharging side of the connecting pipe 140. The base platform is formed at the bottom of the base frame of the sub-tank type heat collector to form the height difference, and the height difference of the base platform corresponding to the adjacent sub-tank type heat collector is 20-50cm.
The connecting pipes are designed to be height difference, namely the connecting pipes connecting the sub-tank type heat collector and the cold tank or the hot tank are arranged in a slope mode, so that the lowest point of the side is formed at the outlet of the first sub-tank type heat collector and the outlet of the second sub-tank type heat collector, and therefore molten salt in all pipelines behind the cold salt pump until the inlet of the hot tank is completely discharged.
The heat collection field of the invention continues the conventional design adopting the whole horizontal plane, but the arrangement of the base station changes the height of two adjacent sub-groove heat collectors, the structure, the assembly form and the operation of each sub-groove heat collector are not affected, the heat collection pipes are also kept horizontally arranged, but a plurality of heat collection pipes of one groove heat collector form the height difference, and the height difference is formed between the two groups of sub-groove heat collectors, so that the bridge section connecting pipe and the horizontal plane office have certain inclination, the whole device has a unique highest point and two relatively low points, an air inlet is arranged at the high point, a salt discharge branch pipe is arranged at the low point, gravity salt discharge can be realized by utilizing the inclination angle, meanwhile, the inclined arrangement is preferably east-low-west high, so that the heat collection field has better sun-facing angle, and simultaneously, the two groups of groove heat collectors adopt different height arrangements, thereby reducing the mutual influence, effectively reducing the distance between the two groups of groove heat collectors, reducing the whole occupied area and saving the cost.
Meanwhile, the temperature in the first groove type heat collector is relatively low, so that the first groove type heat collector adopts a relatively large angle, the salt discharging speed is high, and molten salt solidification is avoided.
Moreover, adopt the slope setting, the fused salt velocity of flow is slow relatively at the relatively lower first slot type collector section of temperature, improves the temperature rise of this section, and at second slot type collector section, fused salt temperature itself is high for it flows, can improve the heat exchange efficiency of fused salt like this in whole degree, improves holistic heat collecting capacity.
The salt discharging branch pipe 140 includes a connecting pipe 141 vertically arranged or vertically arranged with the connecting pipe, a high temperature corrugated pipe 142 fixedly connected with the connecting pipe, and a connecting flange 142 fixedly arranged at the end of the high temperature corrugated pipe. And a temperature sensor is arranged on the guide tube of the salt discharging branch tube or a connecting tube connected with the guide tube.
Utilize high temperature bellows to connect, make it more convenient with being connected of dredging the salt jar, in addition dredge salt jar hoist and mount portable, can keep reasonable safe distance with the connecting pipe, improve convenient to use and security, simultaneously, utilize the non-vertical setting connect the guide tube and set up temperature sensor on connecing the guide tube or connect the connecting pipe of guide tube junction, utilize the temperature detection of salt discharging mouth side, can sense the fused salt and finish, moreover, through the temperature monitoring to the emission point, also can avoid fused salt temperature too low or too high.
Further, in order to accelerate salt removal, especially improve the cleanliness of salt removal, an air inlet port is further provided on the valve port side of the air inlet valve 120 so as to be connected with a nitrogen source, and a gas heating mechanism is disposed on the communication pipeline between the air inlet port and the air source in a penetrating manner so as to heat nitrogen.
Specifically, the salt draining tank for the lens field comprises a salt storing tank 1, a salt inlet pipe 2 arranged on the salt storing tank and corresponding to the salt draining branch pipe 140, an air inlet pipe 3 connected on the salt inlet pipe in a bypass mode, and a salt draining pipe 5 communicated with the bottom of the salt storing tank, wherein sealing flanges are detachably and fixedly arranged at the ends of the salt inlet pipe and the salt draining pipe. Wherein, a salt inlet control valve can be arranged at the upper part of the side joint of the salt inlet pipe and the air inlet pipe.
According to the invention, the side of the salt inlet pipe is connected with the air inlet pipe, and then the salt discharging pipe communicated with the bottom is utilized to form a pneumatic salt discharging mode, so that the pneumatic salt discharging is simple and reliable, can be effectively discharged, ensures that the salt discharging is quick, and can not damage the molten salt, so that the molten salt can be recycled.
Specifically, the salt discharging tank 1 comprises a cylindrical tank body 10, cover plates 11 fixedly arranged at two ends of the tank body, a bracket 4 is arranged at the bottom of the tank body, and lifting lugs 12 are arranged at two ends of the top of the tank body. The salt inlet pipe is arranged at the middle part or one side of the top of the tank body. The salt discharging pipe is L-shaped, the horizontal section at the bottom of the salt discharging pipe is fixedly connected and communicated with the bottom of the tank body, and the vertical section of the salt discharging pipe is positioned at the outer side of the tank body and extends upwards to the top of the tank body. Preferably, the bottom of the tank body is conical, and the salt outlet pipe is provided with a bottom inlet at the bottommost part.
Adopt the combination formula salt tank of arranging, the apron and the jar body of both sides pass through bolted connection, and the installation preparation of being convenient for can dismantle the apron is whole when the condition takes place moreover and maintain, increases operating space, improves the convenience of use, simultaneously, utilizes L type salt discharging pipe and export to be higher than the jar body, can avoid unexpected revealing to produce the calamities.
Meanwhile, in order to improve the use safety, the tank body is also provided with a safety discharge pipe in a communicated manner, the middle part of the safety discharge pipe is connected with a safety valve in series, the safety valve is connected with a safety bypass pipe in parallel, the safety bypass pipe is connected with a control valve in series, the safety discharge of internal air during salt feeding can be realized through the control of the control valve, and the safety explosion-proof protection effect can be also realized during salt discharging. Meanwhile, in order to reduce valve setting, the air inlet pipe is arranged in an upward inclined mode, so that when molten salt enters the tank body, the molten salt can be kept in an open state, and gas in the tank body is convenient to overflow.
The first and second trough type heat collectors respectively comprise a plurality of sub-trough type heat collectors, rotary joints 7 communicated with the cold tank or the hot tank through high-temperature corrugated pipes 151 are respectively arranged between the heat collecting pipes of the sub-trough type heat collectors and between the heat collecting pipes,
meanwhile, the high-temperature corrugated pipes are adopted at a plurality of positions, the connection between the two heat collecting pipes is realized by utilizing the two corrugated pipes and the rotary joint, the connection between the heat collecting pipes and the fixed pipeline is realized by utilizing the two corrugated pipes and the rotary joint, the fixed pipeline refers to a bridge section connecting pipe or a pipeline connected to a cold tank or a hot tank, the combination of the two corrugated pipes and the rotary joint is utilized, the independent movement of the two corrugated pipes is ensured, the pressure of the pipeline can be effectively buffered by the high-temperature corrugated pipes, and the safety and the service life of the heat collecting pipes are improved.
As one specific embodiment, the rotary joint 7 comprises a connecting outer cylinder 71 fixedly connected with the base frame and two inner cylinders 72, wherein each inner cylinder comprises a connecting tube 73, one end of which is fixedly connected with the high-temperature corrugated tube, a butt corrugated tube 74 fixedly arranged at the other end of the connecting tube, a sealing ring 75 fixedly arranged at the end part of the butt corrugated tube, sealing ring holding surfaces of the two inner cylinders are contacted and hermetically arranged inside the connecting outer cylinder 71, and the connecting tubes are respectively and rotatably fixedly connected with the connecting outer cylinder and enable the two sealing rings to hold preset pressure. The connecting tube is a stainless steel tube for realizing pressure transmission and fixed connection.
Wherein, a positioning step is formed on the guide tube, a shaft sleeve or a bearing 76 is sleeved at the positioning step, and a compression ring 77 fixedly connected with the flange of the connecting outer cylinder is propped against the bearing or the shaft sleeve to compress the two sealing rings. Namely, flange rings are formed at two ends of the connecting outer cylinder, and the compression ring comprises a compression ring which can be inserted into the connecting outer cylinder and a connecting flange which is fixedly connected with the compression ring through bolts and fixedly connected with the flange rings. Further, in order to improve the assembly and centering positioning effect, the pressing ring is a split ring, namely, the cylindrical pressing ring is split into two halves along the axial centering, so that the design of corrugated pipes on two sides is convenient, the overall sealing butt joint effect can be improved, and the inner surface of the pressing ring after butt joint fixation directly maintains clearance fit with the guide pipe.
An electric heating mechanism is arranged outside or inside the connecting outer cylinder and outside the inner cylinder, and a salt leakage port is arranged at the bottom of the connecting outer cylinder.
The butt joint corrugated pipes with certain length and rigidity are welded at the butt joint positions of the connecting pipes of the rotary joint, the other ends of the butt joint corrugated pipes are welded with the sealing rings made of wear-resistant materials, after the rotary joint is assembled, the sealing rings are in butt joint, the butt joint corrugated pipes have a certain compression amount, the expansion amount after thermal expansion is effectively utilized, the axial pretightening force required by sealing contact is provided, and meanwhile working spaces of rotary components such as working media, bearings and the like are independently separated. Namely, the structure of direct sealing and butt joint of pipelines is adopted, so that the dependence of components such as bearings on sealing performance is eliminated; under the high-temperature working environment, the butt joint corrugated pipe can absorb the expansion and contraction amount of the pipeline in the rotary joint, so that the compression amount of the butt joint corrugated pipe is increased, the expansion and contraction amount of each component material under the high-temperature environment is positively utilized to improve the sealing performance, and the assembly structure is improved to eliminate the dependence of components such as a bearing on the sealing performance in an acid-base working medium.
Wherein the length of the butt joint corrugated pipe is 30-80mm, and the rigidity is more than 100N/mm. In order to ensure the integral sealing effect, the compression pressure between the sealing rings is larger, generally 2Mpa or more, and when high-temperature molten salt, such as 580 ℃ high-temperature molten salt, flows inside, the pressure between the two sealing rings can reach 4Mpa or more. The butt joint corrugated pipe is made of high-temperature resistant stainless steel, such as 304H, the wall thickness of the butt joint corrugated pipe is 0.6-1mm, such as 0.8mm, the pitch is 8-12mm, such as 10mm, the length of the whole butt joint corrugated pipe is 30-80mm, preferably 40-70cm, such as 50cm,60cm, the rigidity of the butt joint corrugated pipe is more than 100N/mm, the expansion and contraction in the rigidity range belong to elastic deformation, no fatigue influence exists, long-time use can be met, the length of the butt joint corrugated pipe is related to the compression amount required by calculation, the sealing ring is made of hard alloy, such as stetree, and the fixed connection of the butt joint corrugated pipe and a connecting pipe is realized by adopting professional welding.
The sealing ring is a corresponding plane, slope or cambered surface sealing pair. Namely, the sealing ring has three structures: the first is a planar sealing structure, namely, the contact sealing surface is in a planar butt joint mode; the second is a conical surface sealing structure, namely, the contact sealing surface is in a conical surface matching mode; the third is a spherical sealing structure, namely, the contact sealing surface is in an annular convex and concave spherical matching mode, the design of the corresponding surface of the sealing ring, and the self-centering performance of the sealing ring after the sealing ring and the flexible corrugated pipe are welded is improved, so that the friction force and the sealing performance of the contact surface of the sealing ring are improved.
Meanwhile, the invention discloses a salt discharging method of the gravity salt discharging type heat collection field, which comprises the following steps,
1) Closing the cold salt pump, buckling the first groove type heat collector and the second groove type heat collector,
the buckling means that the pipe is turned to the lowest position, sunlight is not received at the angle, and the phenomenon that the temperature is too high due to the fact that molten salt in the pipe is little is avoided;
2) When no molten salt flows in the hot tank, the molten salt inlet of the hot tank is closed, the air inlet valve is opened, the salt discharging branch pipe is opened, the molten salt enters the salt dredging tank under the gravity,
3) When the flow is reduced, the relative salt discharging branch pipe is gradually lifted from far to near, when the temperature sensed by the temperature sensor is lower than 300 ℃, salt discharging is stopped or the first trough type heat collector or the second trough type heat collector is rotated to reheat, and finally, the process of purging the inside of the pipe by utilizing high-temperature nitrogen is further included.
4) When molten salt in the lens field is discharged cleanly, closing a control valve on the safety bypass, closing a salt feeding control valve, detaching a blind flange at the end part of the salt discharging pipe, and sealing the end part of the salt feeding pipe by a sealing flange;
5) The air inlet pipe is communicated with a nitrogen source, the salt storage tank is lifted to a matched height of the cold tank, the outlet of the salt outlet pipe is flush with or slightly higher than the height of a salt return port of the cold tank, a pipeline type gas heating device is arranged between the air inlet pipe and the nitrogen source, such as the nitrogen cylinder in series, and the salt is insulated by heating gas,
6) And discharging the molten salt in the salt storage tank into the cold tank from the tank body by utilizing the pressure of the nitrogen source.
According to the salt discharging method, the pressure of gas can be reduced by combining the lifting tank body with the pressure of the gas, the use safety is improved, and the gas for pressing the molten salt is utilized to reheat the molten salt in the salt storage tank and the cold tank, so that solidification caused by the fact that the temperature of the molten salt is too low is effectively avoided. According to the salt discharging method, the drop is formed by utilizing the topographic advantages in the installation process of the heat collection field, and the salt discharging speed is accelerated under the conditions of molten salt gravity and drop. And the temperature and the flow are monitored in real time in the discharging process, the heat collecting pipe is rotated to enable the heat collecting pipe to be lifted, the discharging is accelerated, and the heat collecting effect can be utilized for reheating during long-time discharging, so that the discharging is ensured.
In summary, the gravity salt discharging is characterized in that the gravity of molten salt is relied on to flow into the lowest point; and in the installation process of the second heat collection field, the drop is formed by utilizing the topographic advantages, and the salt discharging speed is accelerated under the conditions of molten salt gravity and drop. For salt removal of fused salt in a large-scale heat collection field, a salt-thinning tank can be lifted to the vicinity of a cold tank transported to a relatively short distance by a transport vehicle by lifting equipment.
According to the salt discharging method, the drop is formed by utilizing the topographic advantages in the installation process of the heat collection field, and the salt discharging speed is accelerated under the conditions of molten salt gravity and drop. And the temperature and the flow are monitored in real time in the discharging process, the heat collecting pipe is rotated to enable the heat collecting pipe to be lifted, the discharging is accelerated, and the heat collecting effect can be utilized for reheating during long-time discharging, so that the discharging is ensured. And when realizing the salt is arranged to gravity, the operating condition is not influenced, and especially the stress of each bearing and the angle distance can adopt the existing scheme, thereby reducing the redevelopment cost.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (8)
1. The utility model provides a bench type gravity salt removal type heat collection field, which is characterized in that, including cold tank, first slot type heat collector, bridge section connecting pipe, second slot type heat collector and the heat tank that communicate in proper order, wherein, first slot type heat collector include a plurality of sub-slot type heat collectors, the heat collecting pipe of a plurality of sub-slot type heat collectors of first slot type heat collector respectively with horizontal plane parallel arrangement and along keeping away from cold tank direction height step by step, the heat collecting pipe of a plurality of sub-slot type heat collectors of second slot type heat collector respectively with horizontal plane parallel arrangement and along being close to the heat tank direction height step by step that reduces, at least the base that first slot type heat collector and bridge section connecting pipe adjacent sub-slot type heat collector correspond is higher than the corresponding base of corresponding second slot type heat collector, the bridge section connecting pipe tip side with first slot type heat collector connect the admission valve, the low point of the connecting pipe of the first trough type heat collector and the low point of the connecting pipe of the second trough type heat collector are respectively connected with a salt discharging branch pipe by side, a salt discharging tank is arranged below the salt discharging branch pipe, the first trough type heat collector and the second trough type heat collector respectively comprise a plurality of sub-trough type heat collectors, a base table is formed at the bottom of a base frame of each sub-trough type heat collector so as to form the height difference, the height difference of the base table corresponding to the adjacent sub-trough type heat collector is 20 cm to 50cm, rotary joints communicated with a cold tank or a hot tank through high-temperature corrugated pipes are respectively arranged between the heat collecting pipes of the sub-trough type heat collectors, each rotary joint comprises a connecting outer cylinder and two inner cylinders, each inner cylinder comprises a connecting guide pipe with one end fixedly connected with the high-temperature corrugated pipe, a butt joint corrugated pipe fixedly arranged at the other end of the connecting guide pipe, and the sealing rings are fixedly arranged at the end parts of the butt joint corrugated pipes, the sealing rings of the two inner pipes are arranged in the connecting outer cylinder in a sealing contact manner, the connecting pipes are respectively and rotatably and fixedly connected with the connecting outer cylinder, the two sealing rings are kept at preset pressure, the contact sealing surfaces are in annular convex and concave spherical surface matching forms, and the design of the corresponding surfaces of the sealing rings further improves the friction force and the sealing performance of the contact surface of the sealing rings.
2. The stepped gravity salt-discharging type thermal-arrest field according to claim 1, wherein said salt-discharging branch pipe is a connecting pipe vertically arranged or vertically arranged with said connecting pipe, a high-temperature corrugated pipe end fixedly connected with said connecting pipe, and a connecting flange fixedly arranged at the end of the high-temperature corrugated pipe.
3. The stepped gravity salt-discharging type thermal-arrest field according to claim 2, wherein a temperature sensor is provided on a connection pipe of the salt-discharging branch pipe or a connection pipe connected with the connection pipe.
4. The stepped gravity salt-discharging type heat collection field according to claim 1, wherein the salt-discharging tank comprises a salt storage tank, a salt inlet pipe arranged at the top of the salt storage tank, an air inlet pipe connected to the salt inlet pipe in a bypass mode, and a salt-discharging pipe communicated with the bottom of the salt storage tank, a salt inlet control valve is arranged at the upper portion of a bypass point of the salt inlet pipe and the air inlet pipe, and sealing flanges are detachably and fixedly arranged at the ends of the salt inlet pipe and the salt-discharging pipe.
5. The stepped gravity salt-discharging thermal-arrest field according to claim 4, wherein said salt-discharging tank comprises a cylindrical tank body, cover plates fixedly arranged at two ends of said tank body, brackets are arranged at the bottom of said tank body, lifting lugs are arranged at two ends of the top of said tank body, the bottom of said tank body is conical, an inlet at the bottom of said salt discharging pipe is arranged at the lowest position of the bottom, said salt discharging pipe is L-shaped, a horizontal section of the bottom of said salt discharging pipe is fixedly connected and communicated with the bottom of said tank body, and a vertical section of said salt discharging pipe is positioned outside said tank body and extends upwards to the top of said tank body.
6. The stepped gravity salt-discharging type heat collection field according to claim 1, wherein a positioning step is formed on the connecting pipe, a shaft sleeve or a bearing is sleeved at the positioning step, and a compression ring fixedly connected with the connecting outer cylinder is propped against the bearing or the shaft sleeve to compress the two sealing rings.
7. A salt discharging method of a stepped gravity salt discharging type heat collecting field according to any one of claims 1 to 6, comprising the steps of,
1) Closing the cold salt pump, buckling the first groove type heat collector and the second groove type heat collector,
the buckling means that the pipe is turned to the lowest position, sunlight is not received at the angle, and the condition that the temperature is too high due to less molten salt in the pipe is avoided;
2) When no molten salt flows in the hot tank, the molten salt inlet of the hot tank is closed, the air inlet valve is opened, the salt discharging branch pipe is opened, the molten salt enters the salt dredging tank under the gravity,
3) When the flow is reduced, the relative salt discharging branch pipe is gradually lifted from far to near, and when the temperature sensed by the temperature sensor is lower than 300 ℃, salt discharging is stopped or the first groove type heat collector or the second groove type heat collector is rotated to reheat.
8. The salt rejection method of claim 7, further comprising an in-line purging process with high temperature nitrogen.
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| WO2011061333A1 (en) * | 2009-11-20 | 2011-05-26 | Huhnseal Ab | High temperature axial seal, system and method |
| DE102014208302B3 (en) * | 2014-05-02 | 2015-07-16 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Method for operating a solar thermal power plant and solar thermal power plant |
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