CN211204473U

CN211204473U - Fused salt jet heat exchanger based on solar energy spotlight

Info

Publication number: CN211204473U
Application number: CN201922147275.9U
Authority: CN
Inventors: 陈永昌; 庞廷廷; 马重芳
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-08-07
Anticipated expiration: 2029-12-04

Abstract

The utility model provides a fused salt efflux heat exchanger based on solar energy spotlight relates to the indirect heating equipment field, includes: the device comprises a shell, a plurality of groups of U-shaped pipes, a left flange, a right flange, a pipe box, a partition plate, a molten salt tank, a left main pipe, a lower main pipe, bolts, nuts and a stainless steel inclined body. The bottom in the casing is equipped with a stainless steel tilter, the multiunit U-shaped pipe passes left side flange and right side flange respectively, and is equipped with a plurality of efflux round holes on the U-shaped pipe, the left side flange outside is equipped with a pipe case, the right side flange outside is equipped with the molten salt jar, the vertical baffle that is equipped with in the pipe case is equipped with the through-hole on the corresponding position of baffle and is the fused salt entry, the pipe case left side is equipped with a house steward and is the molten salt general import, it is the fused salt export to be equipped with a through-hole on the flange of right side, the molten salt jar lower. The high-temperature molten salt impacts the shell from the jet holes in the multiple groups of U-shaped tubes, so that the temperature of the shell after condensation is reduced, the shell is uniformly heated, and the service life of the heat exchanger is prolonged.

Description

Fused salt jet heat exchanger based on solar energy spotlight

Technical Field

The utility model relates to a indirect heating equipment field especially relates to an adopt fused salt to be fluidic heat exchanger of solar energy spotlight of working medium.

Background

The heat exchanger is a device for transferring partial heat of hot fluid to cold fluid, is also called as a heat exchanger, and is widely applied to the industrial fields of petroleum, chemical industry, energy, power, food and the like. In recent years, due to the problems of energy shortage, environmental protection and the like, the research on heat transfer enhancement technology and the research and development requirements of corresponding heat exchangers are higher and higher, and in order to improve the heat transfer efficiency and perform energy conservation and emission reduction, the heat exchange process must be reasonably organized, and the waste heat is utilized and recovered, so that the heat exchangers are often and inseparably designed and used reasonably. With the rapid development of science and technology, extreme working conditions such as high temperature, high pressure and high heat flow are more and more common, and under the severe conditions, although common coil pipe type and double-pipe type heat exchangers are still used in some occasions, due to the fact that the heat exchange efficiency of the heat exchangers is low, metal consumption is large, and the structure is heavy, a novel heat exchanger is urgently needed. The jet impact method has extremely high heat transfer efficiency because fluid vertically impacts a heat exchange surface to form a very thin boundary layer, and the convective heat transfer coefficient of the jet impact method is several times or even one order of magnitude higher than that of the fluid flowing in a common pipe, so that the jet impact method is widely applied as an extremely effective heat transfer enhancement means and plays an important role in future industrial application. In recent years, molten salt is used as a novel heat transfer and storage working medium, receives increasingly wide attention and application due to the advantages of wide working temperature range, low steam pressure, low viscosity, strong stability, high heat capacity and the like, is particularly suitable for heat transfer and storage processes under extreme conditions of high temperature, high heat flow and the like, can be used for various energy forms such as solar energy, nuclear energy, high temperature industrial waste heat and the like, has a condensation ratio of 200-3000 for the current international heliostat, condenses ordinary sunlight into a light beam with high energy density through the heliostat, acts on a heat exchanger, has an operating temperature of 500-1500 ℃, has higher requirements for the performance of the heat exchanger under the condition of high condensation ratio, and faces a great challenge of high temperature and high heat flow! And the combination of the molten salt working medium and the jet impact technology can obviously improve the heat transfer efficiency of the heat exchanger, effectively improve the working performance of the heat exchanger and provide support for reasonable design and application of the novel heat exchanger.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a purpose design provides a fused salt jet heat exchanger based on solar energy spotlight in order to solve the problem that exists when current heat exchanger design is faced the high heat flow condition of high temperature.

In order to achieve the above purpose, the utility model discloses a technical scheme is:

A fused salt jet heat exchanger based on solar energy condensation comprises: the device comprises a shell, a plurality of groups of U-shaped pipes, a left flange, a right flange, a pipe box, a partition plate, a molten salt tank, a left main pipe, a right main pipe, bolts, nuts and a stainless steel inclined body. The bottom in the casing is equipped with a stainless steel body that has certain inclination, the multiunit U-shaped pipe passes left side flange and right side flange respectively, be equipped with a plurality of circular jet orifices on the U-shaped pipe, the outside of left side flange is equipped with the pipe case, the outside of right side flange is equipped with the molten salt jar, the vertical baffle that sets up in the pipe case falls into first cavity and second cavity with the pipe case, the left side of pipe case is equipped with a house steward and is the total import of fused salt, be equipped with a through-hole on the flange of right side and export for the fused salt, the lower extreme of molten salt jar is equipped with a house steward and exports for the fused salt, it imports for the fused salt to be. The shell, the left flange and the pipe box are fixedly connected through bolts and nuts, and the shell, the right flange and the molten salt tank are also fixedly connected through bolts and nuts.

Preferably, the inclination angle of the stainless steel body is 5-10 degrees, namely the included angle between the bottom surface of the stainless steel body and the inclined surface of the stainless steel body is 5-10 degrees, the inclined surface inclines towards the right lower side, and the bottom surface of the stainless steel body is tangent to the inner bottom surface of the shell, so that the molten salt can smoothly flow out, and is prevented from being accumulated at the bottom of the heat exchanger.

Preferably, a vertical partition plate is arranged in the tube box to form a buffer area, so that molten salt is prevented from directly impacting the opening of the U-shaped tube.

Preferably, the left side, the right side and the upper side of the partition board are provided with through holes, and the aperture of the through hole at the upper side is larger than the aperture of the through hole at the left side and the right side. The molten salt is prevented from flowing into each U-shaped pipe uniformly due to the gravity of the molten salt.

Preferably, the material of U-shaped pipe and casing is the anticorrosive metal of shock resistance, because the fused salt has corrosivity, the utility model discloses through adopting anticorrosive metal U-shaped pipe and casing, improve equipment's life.

Preferably, the diameter of the U-shaped pipe is about 20mm, and the clearance between adjacent pipes is more than 6 mm.

Preferably, the through holes on the left and right flanges correspond to the U-shaped pipes one by one, and the U-shaped pipes are fixed.

Preferably, the aperture of the through hole on the right flange is slightly larger than that of the U-shaped pipe, so that the U-shaped pipe is prevented from being damaged by thermal stress.

Preferably, the right flange is provided with a through hole, so that the molten salt can fully flow out, and the phenomenon that the molten salt is accumulated in the heat exchanger to reduce the heat exchange effect is avoided.

Preferably, the open end of the front end of the U-shaped pipe is fixedly connected with the pipe plate and is flush with the surface of the pipe plate.

Preferably, a plurality of jet circular holes are formed in one side of each group of U-shaped pipes, and the jet aperture is 2-5 mm, so that molten salt can be fully sprayed and covered on the surface of a heat exchanger needing light gathering and heat exchanging, and jet impact is utilized to perform efficient heat exchanging.

Preferably, the jet flow circular holes can be arranged in an in-line mode or a fork mode.

Preferably, the distance is 3-8 times efflux aperture between the efflux round hole, this practicality adopts the efflux hole interval of certain size, neither can be because efflux hole interval is too little like this, and two adjacent efflux fluid working mediums adsorb each other, reduce the area of contact of efflux fluid and environment fluid to weaken the heat transfer, also can not because the distance is too big between the efflux hole, and make the heat transfer inhomogeneous, avoided because the heat can't in time be taken away to the heat transfer working medium makes the heat-transfer face high temperature and lead to the problem of thermal stress destruction.

Preferably, the distance between the jet hole on the U-shaped pipe and the shell is 2-8 times of the jet aperture, and the specific value is determined by the heat transfer surface and the ambient temperature.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses simple structure utilizes the efflux to strike and carries out high-efficient heat transfer, simultaneously, adopts reasonable efflux array mode of arranging, improvement heat transfer efficiency that can be very big, reduces the unevenness of being heated of heat-transfer surface, improves the life of heat exchanger, the heat transfer heat accumulation process under extreme conditions such as specially adapted high temperature high heat flow.

Drawings

Fig. 1 is a cross-sectional view of a molten salt jet heat exchanger based on solar concentration.

Fig. 2 is a left side view of the separator.

Fig. 3 is a left side view of the right flange.

FIG. 4 is a front view of a section of U-shaped tubing taken when the holes are lined and plugged.

In the figure: 1. the device comprises a shell, 2, a plurality of groups of U-shaped pipes, 3, a left flange, 4, a right flange, 5, a pipe box, 6, a partition plate, 7, a molten salt tank, 8, a left main pipe, 9, a lower main pipe, 10, bolts, 11, nuts, 12, a stainless steel inclined body, 21, a jet flow circular hole, 51, a first chamber, 52, a second chamber, 81, a molten salt inlet and 91, a molten salt outlet.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

As shown in figure 1, the invention is provided with a molten salt tank 7, a right flange 4, a plurality of groups of U-shaped pipes 2, a shell 1, a left flange 3 and a pipe box 5 in sequence from right to left, wherein the left side of the pipe box 5 is provided with a header pipe 8 as a total inlet of molten salt, and the lower part of the molten salt tank 7 is provided with a header pipe 9 as a total outlet of the molten salt. Casing 1 carries out fixed connection through flange 3 and bolt 10 nut 11 that are located the 1 left end of casing with pipe case 5, casing 1 carries out fixed connection through flange 4 and bolt 10 nut 11 that are located the 1 right side of casing with molten salt jar 7, right side flange 4, multiunit U type pipe 2, molten salt jar 7, casing 1, left side flange 3, pipe case 5 connect gradually, wholly are the rectangle structure, in addition, still be equipped with a stainless steel tilter 12 in the casing 1, and inclination is 10, and its bottom is tangent with the interior bottom surface of casing 1.

As shown in fig. 1 and 2, a partition plate 6 is further disposed inside the tube box 5, so as to divide the tube box 1 into two chambers with different sizes, namely a first chamber 51 and a second chamber 52, and the first chamber 51 is larger than the second chamber 52, so that the molten salt can rapidly fill the second chamber 52 and finally flow into each group of U-shaped tubes 2, and similarly, three circular holes are disposed on the partition plate 6, and the circular holes above the partition plate are larger than the circular holes on the left and right sides, so that the molten salt can fully and uniformly flow into each group of U-shaped tubes 2.

As shown in fig. 1 and 3, the U-shaped pipe 2 is inserted into the left flange 3 and the right flange 4, the straight pipe end of the U-shaped pipe 2 is flush with the left flange 3, the bent pipe end is located at the right end of the right flange 4, meanwhile, the left flange 3 is provided with through holes with the same pipe diameter as the U-shaped pipe, the number of the through holes on the left flange 3 is the same as the number of the U-shaped pipe straight pipes, the right flange 4 is provided with through holes with a slightly larger hole diameter than the hole diameter of the U-shaped pipe 2, and the right flange 4 is provided with a fused salt outlet 91 besides the through holes with the same number of the U-shaped pipe straight pipes, so that the jet flow can rapidly. A plurality of jet flow round holes 21 are formed in the U-shaped pipe, and the jet flow round holes are arranged in a certain mode, as shown in fig. 4(a) and (b), the jet flow round holes can be arranged in sequence or in a staggered manner.

The working principle is as follows:

The utility model provides a fused salt efflux heat exchanger based on solar energy spotlight, the heat exchanger surface is the casing absorbs the sunlight temperature rise after the focus promptly, the high temperature fused salt that is greater than 200 ℃ flows into first cavity from the left manifold with certain speed, the fused salt entry through on the baffle flows into the second cavity, thereby flow in the U-shaped pipe, the jet hole formation jet impact on the casing of rethread U-shaped pipe, form very thin boundary layer on the casing surface, the heat transfer of high heat flow has been realized, the high temperature fused salt that cools off the casing and produce flows out from the fused salt export of right side flange, flow in the fused salt jar, at last flow out from the lower manifold below the fused salt jar, get into other devices, take away the heat on the casing that will absorb the sunlight, the temperature of casing surface has been reduced, thereby realize the high-efficient heat transfer of casing and surrounding medium.

In addition to the above embodiments, the present invention includes other embodiments, and those skilled in the art should understand that all equivalent modifications and changes made according to the spirit of the present invention should be covered by the protection scope of the present invention without departing from the spirit of the present invention.

Claims

1. The utility model provides a fused salt efflux heat exchanger based on solar energy spotlight which characterized in that: the method comprises the following steps: casing (1), bolt (10), nut (11), its characterized in that still includes: the device comprises a plurality of groups of U-shaped pipes (2), a left flange (3), a right flange (4), a pipe box (5), a partition plate (6), a molten salt tank (7), a left main pipe (8), a lower main pipe (9) and a stainless steel inclined body (12); a stainless steel inclined body (12) is arranged at the bottom in the shell (1), a plurality of groups of U-shaped pipes penetrate through a left side flange (3) and a right side flange (4) respectively, a plurality of circular jet holes (21) are formed in the U-shaped pipe (2), a pipe box (5) is arranged on the outer side of the left side flange (3), a molten salt tank (7) is arranged on the outer side of the right side flange (4), a partition plate (6) is vertically arranged in the pipe box (5), the pipe box (5) is divided into a first cavity (51) and a second cavity (52), a left main pipe (8) is arranged on the left side of the pipe box (5) and is a molten salt inlet, a through hole is formed in the right side flange (4) and is a molten salt outlet (91), a lower main pipe (9) is arranged at the lower end of the molten salt tank and is a molten salt outlet, and; the shell (1), the left flange (3) and the pipe box (5) are fixedly connected through bolts and nuts, and the shell (1), the right flange (4) and the molten salt tank (7) are also fixedly connected through bolts and nuts.

2. A molten salt jet heat exchanger based on solar concentration according to claim 1, characterized in that: the inclination angle of the stainless steel inclined body at the bottom of the shell is 5-10 degrees, and the stainless steel inclined body base is fixedly connected with the inner wall at the bottom of the shell.

3. A molten salt jet heat exchanger based on solar concentration according to claim 1, characterized in that: the distance between adjacent jet holes is 3-8 times of the jet hole diameter.

4. A molten salt jet heat exchanger based on solar concentration according to claim 1, characterized in that: the distance between the jet hole on the U-shaped pipe and the shell is 2-8 times of the jet hole diameter.

5. A molten salt jet heat exchanger based on solar concentration according to claim 1, characterized in that: three through holes are arranged on the partition board (6) and are molten salt inlets (81); a through hole is formed above the partition plate, through holes with the same size are formed in the left side and the right side of the partition plate, and the aperture of the through hole above the partition plate is larger than that of the through holes on the left side and the right side.

6. A molten salt jet heat exchanger based on solar concentration according to claim 1, characterized in that: the baffle plate divides the tube box into two chambers with different sizes.

7. A molten salt jet heat exchanger based on solar concentration according to claim 1, characterized in that: the temperature of the fused salt in the U-shaped pipe is more than 200 ℃.