CN109883231B - Pulse tube bundle molten salt heat storage tank with novel structure distribution - Google Patents
Pulse tube bundle molten salt heat storage tank with novel structure distribution Download PDFInfo
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Abstract
The invention provides a fused salt heat storage tank of a pulse tube bundle heat exchange assembly, which comprises a heat storage tank, a pulse generation device and a pulse tube bundle heat exchange assembly, wherein the pulse tube bundle heat exchange assembly is arranged in the heat storage tank and is connected with the pulse generation device; the pulse generation device is connected with an inlet of the pulse tube bundle heat exchange assembly through an inlet pipeline, an outlet of the pulse tube bundle heat exchange assembly is connected with the pulse generation device through an outlet pipeline, and the pulse tube bundle heat exchange assemblies are arranged into a plurality of heat storage tanks and comprise one of the heat storage tanks, a central heat exchange assembly and other peripheral heat exchange assemblies, wherein the central heat exchange assemblies are arranged in the heat storage tanks, and the peripheral heat exchange assemblies are distributed around the centers of the heat storage tanks. The invention designs that the pulsating tube bundle heat exchange assemblies are applied to the molten salt heat storage tank and are arranged in a central annular distribution mode, so that the heat storage effect of the molten salt heat storage tank is further improved, and scaling is reduced.
Description
Technical Field
The invention belongs to the technical field of heat exchangers, and particularly relates to an intelligently controlled pulsating tube bundle heat exchange assembly and a molten salt heat storage tank thereof.
Background
The shell-and-tube heat exchanger is widely applied to the industrial fields of energy power, petrochemical industry and the like, and the enhanced heat exchange technology of the heat exchanger has important significance for energy conservation and consumption reduction. The passive heat transfer enhancement technology achieves the purpose of heat transfer enhancement without external high-quality energy input, and is an important research direction at present.
The mode of passively strengthening heat exchange is to strictly prevent the fluid vibration induction in the heat exchanger from being changed into effective utilization of vibration, so that the convective heat transfer coefficient of the transmission element at low flow speed is greatly improved, dirt on the surface of the heat transfer element is restrained by vibration, the thermal resistance of the dirt is reduced, and the composite strengthened heat transfer is realized.
The rapid development of heat exchangers and related technologies has led to encouraging progress over the last several decades, but some long-standing unsolved problems have become more prominent. The induction vibration and the heat transfer surface area scale of the fluid in the heat exchanger are the outstanding problems which are acknowledged by the world and need to be solved urgently. The fluid-induced vibration can cause severe noise and damage to the heat transfer tube bundle, and fouling of the heat transfer tube bundle surface can cause huge energy and resource loss. It is not possible to completely prevent the vibration of the tube bundle in the heat exchanger, but it is not always effective to prevent the vibration by increasing the strength of the heat transfer tube bundle to avoid the damage and noise of the tube bundle. The mode of passive heat transfer enhancement is to utilize the vibration of the fluid-induced heat transfer tube bundle to realize the heat transfer enhancement, and through the effective utilization of the vibration, the heat transfer enhancement can be realized while inhibiting the heat transfer surface scale deposit, the thermal resistance of the scale is reduced, and the composite heat transfer enhancement is realized.
CN101738129B discloses a vibration inducing device for heat transfer enhancement of an elastic tube bundle heat exchanger, in which pulsating tubes corresponding to floating mass blocks of an elastic tube bundle one to one are disposed on a water inlet tube, and a turbulent fluid is disposed inside the pulsating tubes, and the pulsating fluid with certain intensity and frequency is generated by the fluid flowing around the turbulent fluid, so as to impact the mass blocks of the elastic tube bundle and induce the vibration of the elastic tube bundle. However, due to the top sealing structure of the device, a flow "dead zone" exists in the internal flow field, the flow rate and the flow stability of the fluid flowing into each branch pulsating pipe are poor, the pulsating flow cannot be generated at the outlet of part of the pulsating pipes, and the intensity and the frequency of the generated pulsating flow are inconsistent, so that the expected vibration required for strengthening the heat exchange cannot be realized. Taking a six-branch vibration inducing device for inducing vibration of six rows of elastic tube bundles in a heat exchanger as an example, when an inlet fluid medium is water and the flow rate is 0.4m/s, by changing structural parameters of each part, at least 1 pulsating flow tube can not generate pulsating flow, and the maximum relative error of the intensity of the pulsating flow generated in the other pulsating flow tubes (by setting a monitoring point, detecting the fluid speed and representing the intensity of the pulsating flow by the amplitude of the change of the flow rate) is higher than 14.5%, and the maximum relative error of the frequency of the pulsating flow is higher than 5.0%. In addition, the regulation of the flow of fluid into the pulse tube by the tubing valve does not solve the above problems.
The uniform distribution type pulsating flow generating device induced by vibration of the elastic tube bundle in the heat exchanger disclosed by CN105135931A adopts the following technical scheme: the device comprises a vertical pipe, a branch bent pipe, a flow guide pipe, a pulsating flow pipe, a turbulent flow body and a shell side water inlet pipe; branch bent pipes with consistent intervals are distributed on the vertical pipe, each branch bent pipe is connected with a flow guide pipe, the flow guide pipe is connected with a pulsating flow pipe, and turbulent fluid is arranged on the pulsating flow pipe; the shell side water inlet pipe is arranged at the bottom end of the vertical pipe. When the uniform distribution type pulsating flow generating device is used, one end of the uniform distribution type pulsating flow generating device is fixed on an upper seal head of the heat exchanger, and the other end of the uniform distribution type pulsating flow generating device is suspended at the bottom of the heat exchanger. By controlling the flow of fluid into the standpipe, a uniform pulsating flow of a certain frequency and intensity can be generated at the outlet of each pulsating flow tube. When the frequency of the pulsating flow is close to a certain order natural frequency of the elastic tube bundle, the elastic tube bundle can be induced to vibrate according to a matrix corresponding to the order natural frequency. When the flow velocity is low, the frequency and the intensity of the generated pulsating flow are low, and the elastic tube bundle can be induced to vibrate with low-order natural frequency and a corresponding matrix; when the flow velocity is higher, the frequency and the intensity of the generated pulsating flow are higher, and the elastic tube bundle can be induced to vibrate at a high-order natural frequency and a corresponding matrix. In addition, in the manufacturing process of the uniform distribution type pulsating flow generation device, the inner diameter of a certain branch bent pipe, a flow guide pipe and/or a pulsating flow pipe can be changed or the size and/or the shape of the corresponding turbulent flow can be changed according to the actual use condition of the heat exchanger, so that the frequency and the intensity of the pulsating flow generated by the branch outlet can be controlled, and the vibration of the corresponding elastic tube bundle can be controlled.
Based on the problem that exists among the practical engineering application of above-mentioned elasticity tube bank heat exchanger and the current not enough that is used for elasticity tube bank heat exchanger vibration induction system to exist, foretell elasticity tube bank heat exchanger all adopts the pulse pipe alone, need set up a standpipe alone promptly and come as the pulse pipe for whole elasticity tube bank heat exchanger inner structure is complicated, influences the flow of inside fluid moreover, and foretell elasticity tube bank all is the structure of establishing ties in addition, and the pulse pipe sets up in the quality piece that floats, also can't the efficient participate in the heat transfer. There is therefore a need for improvements to the above-described structures.
In the molten salt heat storage technology, a solid inorganic salt or a mixed inorganic salt is heated and melted, and stored heat is transferred through a molten salt circulation circuit, thereby realizing a heat storage and transfer function of molten salt. Compared with the traditional heat storage working medium, the fused salt has the advantages of good heat transfer performance, wide use temperature range (from dozens to more than one thousand degrees centigrade), low working pressure, less investment and the like, and is considered as an ideal high-temperature heat transfer and heat storage working medium. In recent years, with the rapid development of solar photo-thermal power generation, advanced nuclear energy, waste heat utilization and district heating, molten salt is widely used as an effective heat storage and heat transfer medium.
The fused salt heat storage tank is important equipment in solar photo-thermal power generation or fused salt heat storage area heat supply technology. However, the heat storage tank has the problems of large volume, high consumption of molten salt, nonuniform electric heating or high-temperature fluid heating, long heat storage time of the molten salt and the like. Although the difference between the surface heat transfer coefficient corresponding to the liquid molten salt heat transfer process and the convection heat transfer characteristic of water is not large, in the molten salt tank, the heat storage of the molten salt is realized by the heat conduction and natural convection processes, and the problems of long time required by the heat storage process, low heat storage speed and the like are necessarily existed. How to improve the intensity of the fused salt-based heat storage and heat transfer process and reduce the time required by heat storage is a problem which needs to be solved in a large-scale energy storage system.
Therefore, the invention also provides a molten salt heat storage tank of the intelligently controlled pulsating tube bundle heat exchange assembly. The intelligent control of the fused salt heat storage tank of the pulsating tube bundle heat exchange assembly is utilized to strengthen the heat conduction process of the fused salt, and meanwhile, the corresponding natural convection heat transfer is promoted to be forced convection heat transfer, so that the heat storage efficiency of the fused salt is improved, and the heat storage required time is shortened.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the pulsating tube bundle heat exchange assembly, the heat exchanger and the molten salt heat storage tank with the novel structure, which can quickly exchange heat, reduce scaling and simultaneously improve heating efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fused salt heat storage tank of a pulse tube bundle heat exchange assembly comprises a heat storage tank, a pulse generation device and a pulse tube bundle heat exchange assembly, wherein the pulse tube bundle heat exchange assembly is arranged in the heat storage tank and is connected with the pulse generation device; the heat storage device is characterized in that the pulse tube bundle heat exchange assemblies are arranged in a plurality of ways and comprise one of the heat exchange assemblies arranged at the center of the heat storage tank and other peripheral heat exchange assemblies distributed around the center of the heat storage tank.
Preferably, the flow rate of the pulsating flow of the single peripheral heat exchange assembly is smaller than the flow rate of the pulsating flow of the central heat exchange assembly.
Preferably, the ratio of the flow rates of the pulsating flows of the central heat exchange assembly and the peripheral heat exchange assembly is determined by the distance between the center of the peripheral heat exchange assembly and the center of the heat storage tank and the inner diameter of the heat storage tank.
Preferably, the pulsating tube bundle heat exchange assembly comprises a plurality of coil pipes, an inlet vertical pipe and an outlet vertical pipe, each coil pipe comprises a plurality of arc-shaped heat exchange tubes, the end parts of the adjacent heat exchange tubes are communicated, the heat exchange tubes form a series structure, the end parts of the heat exchange tubes form free ends of the heat exchange tubes, the inlet vertical pipe is connected with an inlet of a first heat exchange tube, the outlet vertical pipe is connected with an outlet of a last heat exchange tube, the pulsating tube bundle heat exchange assembly is characterized in that the inlet vertical pipe is connected with an inlet of the first heat exchange tube through a pulsating tube, and an inlet of the inlet vertical pipe is connected with a pulsating flow generating device and.
Preferably, the heat exchanger is a molten salt heat storage tank.
Preferably, the pulsation generating means is a solenoid valve.
Preferably, under the normal working condition, the regulating valve is closed, the bypass valve is opened, and the fluid enters the molten salt heat storage tank for heat exchange; when vibration descaling is needed or the heat exchange effect is improved, the controller controls the bypass valve to be closed, the regulating valve is opened, and the controller controls the electromagnetic pump to generate pulsating flow.
Preferably, the pulsating tube bundle heat exchange assembly comprises a plurality of coil pipes, an inlet vertical pipe and an outlet vertical pipe, each coil pipe comprises a plurality of arc-shaped heat exchange tubes, the end parts of the adjacent heat exchange tubes are communicated, the heat exchange tubes form a series structure, the end parts of the heat exchange tubes form free ends of the heat exchange tubes, the inlet vertical pipe is connected with an inlet of a first heat exchange tube, the outlet vertical pipe is connected with an outlet of a last heat exchange tube, the pulsating tube bundle heat exchange assembly is characterized in that the inlet vertical pipe is connected with an inlet of the first heat exchange tube through a pulsating tube, and an inlet of the inlet vertical pipe is connected with a pulsating flow generating device and.
Preferably, the pulse pipe is connected with the inlet of the first heat exchange pipe from the inlet vertical pipe in an inclined and upward manner.
Preferably, the pulse pipe is connected with the inlet stand pipe in a welding mode.
Preferably, the inlet of the inlet stand pipe is arranged at the lower end of the inlet stand pipe.
Preferably, the plurality of coils are in a parallel structure and have independent inlets and outlets.
Preferably, along the height direction of the inlet vertical pipe, the pulse pipes are arranged in a plurality, and the pipe diameters of the pulse pipes are continuously increased from the top to the bottom.
Preferably, the increasing amplitude of the pipe diameter of the pulse pipe along the direction from the top to the bottom of the inlet vertical pipe is increased.
Preferably, along the height direction of the inlet vertical pipe, the pulse pipes are arranged in a plurality, and the distance between every two adjacent pulse pipes is gradually reduced from top to bottom.
Preferably, the spacing between adjacent pulse tubes decreases and increases in magnitude along the inlet riser in the direction from top to bottom.
A heat exchanger having disposed therein at least one pulse tube bundle heat exchange assembly of the type described above.
Preferably, the heat exchanger is a molten salt heat storage tank.
Preferably, a plurality of pulsating tube bundle heat exchange assemblies are arranged in the heat storage tank, wherein one of the pulsating tube bundle heat exchange assemblies is arranged in the center of the heat storage tank, and the other pulsating tube bundle heat exchange assemblies form peripheral heat exchange assemblies distributed around the center of the heat storage tank.
Preferably, the flow rate of the pulsating flow of the peripheral heat exchange assembly is smaller than the flow rate of the pulsating flow of the central heat exchange assembly.
Preferably, the ratio of the flow rates of the pulsating flows of the central heat exchange assembly and the peripheral heat exchange assembly is determined by the distance between the center of the peripheral heat exchange assembly and the center of the heat storage tank and the inner diameter of the heat storage tank.
The invention has the following advantages:
1) the pulsating tube bundle heat exchange assemblies are applied to the molten salt heat storage tank and are arranged in a central annular distribution mode, so that the heat storage effect of the molten salt heat storage tank is further improved, and scaling is reduced.
2) A new heat exchange system of the molten salt heat storage tank is designed, so that the flow of the pulsating flow can be adjusted as required, and whether a pulsating descaling mode is started or not is realized, and the intelligence of heat exchange is further improved.
3) The inlet vertical pipe is connected with the inlet of the first heat exchange pipe through the pulse pipe, and an independent pulse pipe is omitted, so that the inlet vertical pipe and the pulse pipe are combined into a whole, and the technical effects of simple structure, convenience in control and high heat exchange efficiency are achieved.
4) The change of the size of the pipe diameter of the pulsating pipe is arranged along the height direction, so that the pulsating pipe can realize different pulsating flows according to the height, the heat exchange effect can be enhanced according to the requirements of different positions, the heat exchange effect can be further improved in a targeted manner, and the formation of scale can be reduced.
5) The pulsating pipe is arranged along the height direction to change the size of the interval, so that the pulsating pipe can realize proper distribution of pulsating flow according to the height, the heat exchange effect can be enhanced according to the requirements of different positions, the heat exchange effect can be further improved in a targeted manner, and the formation of scale can be reduced.
6) Pulse flows in the pulse tube bundle heat exchange assemblies in the coil tubes are reasonably distributed and optimized according to different positions, and the technical effect of pulse heat exchange is further improved. And provides an optimal reference for the design of the molten salt heat storage tank with the structure.
Description of the drawings:
FIG. 1 is a schematic diagram of the pulsating coil configuration of the present invention.
Fig. 2 is a schematic diagram of a pulsating flow generation device of the present invention.
Figure 3 is a schematic of the pulsating coil assembly of the present invention.
FIG. 4 is a schematic view of a molten salt heat storage tank with a built-in pulsating coil according to the present invention.
FIG. 5 is a schematic plan view of a molten salt heat storage tank incorporating a pulsating coil according to the present invention.
FIG. 6 is a system diagram of the molten salt heat storage tank operation of the present invention.
FIG. 7 is a schematic diagram of the size structure of the heat exchange assembly inside the molten salt heat storage tank.
In the figure: 1. the heat exchanger comprises a tank body, 2 shell side outlets, 3 shell side inlets, 4 pulsating coil pipe assemblies, 5 supports, 6-10 pulsating coil pipe assemblies, 11 balancing weights, 12 pulsating coil pipes, 13 pulse pipes, 14 tube side inlet vertical pipes, 15 heat exchange pipes, 16 balancing weights, 17 tube side outlet vertical pipes, 18 heat storage tanks, 19 waste heat utilization heat exchangers, 20 electromagnetic pumps, 21 adjusting valves and 22 bypass valves.
Detailed Description
Fig. 1 to 3 show a pulsating tube bundle heat exchange assembly 6, which comprises a plurality of coil pipes 12, inlet riser pipes 14 and outlet riser pipes 16, wherein the plurality of coil pipes 12 are arranged along the height direction as shown in fig. 3, each coil pipe 12 comprises a plurality of heat exchange tubes 15 in the shape of a circular arc, the end portions of the adjacent heat exchange tubes 15 are communicated, so that the plurality of heat exchange tubes 15 form a series structure, and the end portions of the heat exchange tubes form the free ends of the heat exchange tubes (the position of a bearing block is arranged in fig. 1), the plurality of heat exchange tubes are distributed along the same circle center from the circle center to the outside in sequence, the inlet riser pipe 14 is connected with the inlet of the outermost heat exchange tube, the outlet riser pipe 17 is connected with the outlet of the innermost heat exchange tube 15, the inlet riser pipe 14 is connected with the inlet of the outermost heat exchange tube through a pulsating tube 13, thereby further promoting the vibration of the elastic heat exchange tube bundle to carry out enhanced heat transfer and reduce scaling.
The plurality of coils 12 are arranged in parallel along the height direction of the inlet stand pipe 14.
The fluid enters the outermost heat exchange tube from the inlet of the inlet vertical tube 14 through the pulsating tube, the heat exchange tube bundle vibrates under the flow of the fluid and the impact of the pulsating flow, then the outermost heat exchange tube passes through the outlet vertical tube of the outlet flow channel of the innermost heat exchange tube finally through the flow inside the heat exchange tube, and finally flows out through the outlet vertical tube.
Compared with the prior art, the inlet vertical pipe is connected with the inlet of the first heat exchange pipe through the pulse pipe, so that an independent pulse pipe is omitted, the inlet vertical pipe and the pulse pipe are combined into a whole, and the technical effects of simple structure, convenience in control and high heat exchange efficiency are realized. The pulsating flow generation can be controlled at any time by combining an external pulsating flow generation device.
Preferably, the pulse tube 13 is connected obliquely upward from an inlet riser tube 14 to the inlet of the outermost heat exchange tube 15. Through the inclined design, the pulsating flow at a lower flow speed is generated, and the working condition of the pulsating flow at a lower frequency is obtained. Controlled pulsating flow at lower flow rates is obtained.
Preferably, the pulse tube 13 is connected to the inlet riser 14 by welding.
Preferably, the inlet direction of the inlet stand pipe 16 is located at the lower end of the inlet stand pipe 16. Through setting up at the lower extreme for the pulse stream flows from the lower extreme to the upper end, fills in proper order and is full of the coil pipe, can guarantee that the pulse stream fully fills in whole heat exchange tube, reduces the heat transfer short circuit.
Preferably, as shown in fig. 2, the pulse pipe 13 is provided in plurality along the height direction of the inlet stand pipe 14. The pulse tube 13 has a diameter that becomes larger from the upper end to the lower end of the inlet stand pipe 14. Because found in experiment and practice, along with the continuous going on of heat transfer, the more toward lower extreme, the easier scale deposit of heat exchange tube at lower extreme more, consequently through the big some of pipe diameter distribution of this lower extreme for the flow of the pulsating flow of lower extreme distribution is also more, thereby makes the frequency of vibration also bigger, and the scale removal effect is also better, thereby leads to the whole obvious reinforcing of heat transfer effect.
Preferably, the pulsating pipe has an increasing diameter in a direction from the upper end to the lower end of the inlet stand pipe 14. Because the experiment and practice find that along with the continuous proceeding of heat exchange, from top to bottom, the speed of scaling is not in direct proportion distribution, but the increasing amplitude of scaling is also increased, so the pipe diameter variation amplitude of the lower end is large, the flow increasing amplitude of pulsating flow distributed by the lower end is more, the frequency increasing amplitude of vibration is larger, the scaling effect is better, and the heat exchange effect is obviously enhanced on the whole.
Preferably, the pulse tubes 13 are arranged in plurality along the height direction of the inlet stand pipe 14, and the spacing between the pulse tubes 13 is gradually reduced along the direction from the upper end to the lower end of the inlet stand pipe 14. Because found in experiment and practice, along with the continuous going on of heat transfer, toward the lower extreme more, the heat transfer effect is better, consequently through the close of this lower extreme pulse tube distribution for the flow of the pulsating flow of lower extreme distribution is also more, thereby makes the frequency of vibration also bigger, and the heat transfer effect is also better, thereby leads to the whole obvious reinforcing of heat transfer effect.
Preferably, the spacing between the pulse tubes 13 decreases and increases in magnitude in the direction from the upper end to the lower end of the inlet standpipe 14. Because found in experiment and practice, along with the continuous going on of heat transfer, from top to bottom, the speed that the heat transfer effect increases is not directly proportional distribution, but the range of heat transfer effect also constantly grow, consequently the distribution density variation range through this lower extreme is a little big for the flow increase range of the pulsating flow of lower extreme distribution is also more, and thus the frequency increase range that makes the vibration is also big more, and the heat transfer effect is also better, thereby leads to the whole obvious reinforcing of heat transfer effect.
Preferably, the coil pipe 12 is provided in plurality along the height direction of the inlet stand pipe 14.
The present application also preferably claims a heat exchanger, as shown in fig. 4, having at least one pulsating tube bundle heat exchange assembly, as previously described with respect to fig. 1-3, disposed therein.
Preferably, the heat exchanger is a molten salt heat storage tank.
Preferably, as shown in fig. 5, a plurality of pulsating tube bundle heat exchange assemblies 4-8 are arranged in the heat storage tank, one of the pulsating tube bundle heat exchange assemblies is arranged in the center of the heat storage tank to form a central heat exchange assembly 6, and the other pulsating tube bundle heat exchange assemblies are distributed around the center of the heat storage tank to form peripheral heat exchange assemblies 7-10. Through the structural design, the fluid in the heat storage tank can fully achieve the vibration purpose, and the heat exchange effect is improved.
Preferably, the flow rate of the pulsating flow of the peripheral heat exchange assemblies 7 to 10 is smaller than that of the central heat storage tank 6. Through the design, the center reaches higher vibration frequency to form a central vibration source, so that the periphery is influenced, and better heat transfer enhancement and descaling effects are achieved.
Preferably, on the same horizontal heat exchange section, the fluid needs to achieve uniform vibration, and uneven heat exchange distribution is avoided. It is therefore desirable to distribute the magnitude of the pulsating flow in the different heat exchange assemblies appropriately. Experiments show that the distribution proportion of the flow of the pulsating flow of the central heat exchange assembly and the peripheral tube bundle heat exchange assemblies is related to two key factors, wherein one of the two key factors is related to the distance between the peripheral heat exchange assemblies and the center of the heat storage tank (namely the distance between the circle center of the peripheral heat exchange assemblies and the circle center of the central heat exchange assemblies) and the diameter of the heat storage tank. Therefore, the invention optimizes the optimal proportional distribution of the pulsating flow according to a large number of numerical simulations and experiments.
The heat storage tank is circular cross section, and the inner wall radius is R, the centre of a circle of central heat exchange assembly sets up in the circular cross section centre of a circle of heat storage tank, and the distance of the centre of a circle of peripheral heat exchange assembly apart from the centre of a circle of the circular cross section of heat storage tank is L, and the centre of a circle of adjacent peripheral heat exchange assembly carries out the line with the circular cross section centre of a circle respectively, and the contained angle that two lines formed is A, and single peripheral heat exchange assembly's pulsating flow is M2, and central heat exchange assembly's pulsating flow is M1, then:
M1/M2＝a*(R/L)2-b*(R/L)+c；
a, b, c are coefficients, where 0.107< a <0.109,0.574< b <0.575,2.94< c < 2.95;
preferably, 1.25< R/L < 2.21; preferably, 1.26< R/L < 2;
preferably, 2< M1/M2< 2.5. Preferably, 2.2< M1/M2< 2.4;
preferably, wherein 35 ° < a <80 °.
Preferably, the number of the four-side distribution is 4-5.
Preferably, R is 2000-3000 mm, preferably 2500 mm; l is 1200-2400 mm, preferably 1800 mm; the diameter of the heat exchange tube is 12-20 mm, preferably 16 mm; the outermost diameter of the pulsating coil is 500-700 mm, preferably 600 mm. The diameter of the riser is 100 mm and 116 mm, preferably 108 mm, the height of the riser is 1.8-2.2 m, preferably 2 m, and the distance between adjacent pulse tubes is 80-120 mm. Preferably around 100 mm.
The total heating power is preferably 5000-.
More preferably, a is 0.108, b is 0.5747, and c is 2.9445.
FIG. 5 is a schematic diagram of the overall configuration of a molten salt heat storage tank with a built-in pulse coil. The space on the shell side of the tank body is molten salt. The molten salt after heat storage flows into the molten salt heat exchange equipment from the shell side outlet 2 at the top of the tank body 1, and flows back to the molten salt tank from the shell side outlet 3 at the lower end of the tank body. Five groups of pulsating coil pipe assemblies are arranged in the tank, and the heat transfer process of the liquid molten salt is enhanced by means of vibration formed by pulsating flow induction in the pipe. The support 5 is designed according to the actual situation, and the tank body 1 can be partially arranged below the ground to facilitate salt discharge.
The pulse coil 12 is connected to the pulse tube 11 by a screw thread. The connected pulsating coil pipe can vibrate controllably under the induction of pulsating flow. The frequency and amplitude of the vibration is determined by the frequency of the pulsating flow in combination with the structural characteristics of the pulsating coil.
FIG. 1 is a schematic view of a pulsating coil configuration. The pulsating pipe heat exchange pipes 15 are connected through the balancing weights 11 and 16 to form a complete pipe pass loop. Meanwhile, the heat exchange tube 15 is usually made of stainless steel, copper tube, or the like. Parameters such as the bending radius and the size of the used pipe and the heat exchange pipe 15 directly determine the vibration characteristic of the pulsating coil pipe, and the matching design is required according to the category of fused salt outside the pipe and the working temperature region.
FIG. 6 is a system diagram of the operation of the molten salt heat storage tank. The intelligently controlled fused salt heat storage system with the pulsating tube bundle heat exchange assembly comprises a heat storage tank 18, a pulsation generating device 20, the pulsating tube bundle heat exchange assembly, a regulating valve 21 and a bypass valve 22, wherein the pulsating tube bundle heat exchange assembly is arranged in the heat storage tank and is connected with the pulsation generating device; the pulsation generating device is connected with an inlet of the pulsation tube bundle heat exchange assembly through an inlet pipeline, an outlet of the pulsation tube bundle heat exchange assembly is connected with the pulsation generating device through an outlet pipeline, an adjusting valve is arranged on the inlet pipeline between the pulsation generating device and the heat storage tank, a bypass pipeline is arranged between the outlet pipeline and the inlet pipeline, and the bypass pipeline is located between the adjusting valve and the heat storage tank at the connecting point of the inlet pipeline.
The working medium in the pipe required by the pulsating coil pipe arranged in the heat storage tank 18 is usually high-temperature water and can be generated by a waste heat utilization heat exchanger 19 manufactured on site. The high-temperature water passes through the electromagnetic pump 20, and a pulsating flow is generated. The regulating valve 21 arranged on the pipeline is used for regulating the generation time and generation intensity of pulsating flow, so that the pulsating coil is induced and controlled to realize expected vibration, vibration-enhanced heat exchange of the tube bundle is realized, and the heat exchange efficiency is improved. The bypass valve 22 is configured to accommodate conditions where pulsating flow oscillations are not required. The design can reduce the vibration damage effect of the solid molten salt on the pulsating coil.
The system also comprises a controller, wherein the electromagnetic pump, the regulating valve 21 and the bypass valve 22 are in data connection with the controller, and the controller can control the frequency of the electromagnetic pump and the opening, closing and amplitude of the regulating valve 21 and the bypass valve 22.
Under the normal working condition, the regulating valve 21 is closed, the bypass valve 22 is opened, and the fluid normally enters the molten salt heat storage tank and impacts the pulsating tube bundle vibration through the flow of the fluid. When vibration descaling is needed or the heat exchange effect is improved, for example, the heat exchange efficiency is reduced, the controller controls the bypass valve to be closed, the regulating valve 21 to be opened, and the controller controls the electromagnetic pump to generate pulsating flow.
It is of course preferred that the heat exchange is always carried out by means of a pulsating flow.
The controller can control the magnitude of the pulsating flow as desired. For example, when the vibration noise of the heat exchange assembly is overlarge, the controller automatically controls the frequency or the flow rate of the pulsating flow to be reduced, and equipment damage is avoided.
Through the intelligent control, pulsating flow generation and the frequency and speed of generation can be realized.
Although the present invention has been described with reference to the preferred embodiments, it is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (1)
1. A fused salt heat storage tank of a pulse tube bundle heat exchange assembly comprises a heat storage tank, a pulse generation device and a pulse tube bundle heat exchange assembly, wherein the pulse tube bundle heat exchange assembly is arranged in the heat storage tank and is connected with the pulse generation device; the heat storage device is characterized in that the heat exchange assemblies of the pulse tube bundle are arranged in a plurality of numbers, and comprise a central heat exchange assembly arranged in the heat storage tank and other peripheral heat exchange assemblies distributed around the center of the heat storage tank; the pulsating tube bundle heat exchange assembly comprises a plurality of coil pipes, an inlet vertical pipe and an outlet vertical pipe, wherein each coil pipe comprises a plurality of arc-shaped heat exchange tubes, the end parts of the adjacent heat exchange tubes are communicated, so that the heat exchange tubes form a series structure, the end parts of the heat exchange tubes form the free ends of the heat exchange tubes, the inlet vertical pipe is connected with the inlet of a first heat exchange tube, and the outlet vertical pipe is connected with the outlet of a last heat exchange tube;
the flow rate of the pulsating flow of the single peripheral heat exchange assembly is smaller than that of the central heat exchange assembly.
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| CN201910178569.XA CN109883231B (en) | 2019-03-11 | 2019-03-11 | Pulse tube bundle molten salt heat storage tank with novel structure distribution |
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| CN201910178569.XA CN109883231B (en) | 2019-03-11 | 2019-03-11 | Pulse tube bundle molten salt heat storage tank with novel structure distribution |
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| CN109883231B true CN109883231B (en) | 2020-05-15 |
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| CN112113459B (en) * | 2019-06-21 | 2022-10-14 | 九江紫昊新材料有限公司 | Shell side pressure control method |
| CN112113337B (en) * | 2019-06-21 | 2022-03-29 | 苏州一格新派科技有限公司 | Control method for outlet temperature of heat exchange fluid |
| CN112944679B (en) * | 2019-07-03 | 2022-06-14 | 无锡职业技术学院 | Water heater with changeable field collaborative spacing |
| CN111536689B (en) * | 2019-07-03 | 2021-03-26 | 山东交通学院 | Water heater with periodically-changed heating quantity |
| CN113028875A (en) * | 2020-12-17 | 2021-06-25 | 华北电力大学 | Mechanical vibration system and method for triggering supercooling hydrous salt heat storage unit to solidify and release energy |
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| US6205791B1 (en) * | 1999-07-06 | 2001-03-27 | Massachusetts Institute Of Technology | High efficiency modular cryocooler with floating piston expander |
| JP2004522126A (en) * | 2001-02-28 | 2004-07-22 | 朴 相海 | Vibration heat exchanger |
| CN101266106A (en) * | 2008-05-09 | 2008-09-17 | 山东大学 | Spatially spiral elasticity-intensified heat exchange tube bundle and its supporting device |
| CN101738129B (en) * | 2009-12-10 | 2012-07-04 | 山东大学 | Vibration inducing device for strengthening heat exchange of elastic tube bundle heat exchanger |
| US20120193063A1 (en) * | 2011-02-02 | 2012-08-02 | The Aerospace Corporation | Thermodynamic regenerator |
| CN104930880B (en) * | 2015-06-06 | 2017-04-05 | 浙江工业大学 | A kind of pulsation flow tube shell type heat exchanger and its heat-exchange method |
| CN105135931B (en) * | 2015-09-22 | 2017-08-25 | 山东大学 | The even distribution type pulsation flow generating apparatus vibration induced for elastic tube bundle in heat exchanger |
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