Heat accumulating type continuous heat exchange device and heat exchange method

Abstract

The invention discloses a heat accumulating type continuous heat exchange device and a heat exchange method, and belongs to the technical field of metallurgical high-temperature heat exchange. The technical problems that an existing heat exchange device adopts intermittent heat exchange, medium fluctuation is large, and the failure rate is high due to the fact that valves need to be frequently switched for reversing are solved. The heat accumulating type continuous heat exchange device comprises a movable heat accumulator and n medium pipelines arranged side by side, wherein heat accumulator moving channels are formed in the medium pipelines; the movable heat accumulator can move back and forth along the heat accumulator moving channel; the medium pipeline comprises a heating medium pipeline and heated medium pipelines, the heating medium pipeline and the heated medium pipelines are arranged at intervals, and the heated medium pipelines are located on the two sides of the heating medium pipeline; the flowing direction of a heating medium in the heating medium pipeline is opposite to that of a heated medium in the heated medium pipeline; and the width of the heat exchange area of the movable heat accumulator is equal to the width of n-1 pipelines. The medium flow direction does not need to be frequently switched, and continuous heat exchange is achieved with little fluctuation.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical high-temperature heat exchange, and in particular to a heat storage type continuous heat exchange device and a heat exchange method. Background Art

[0002] Heat exchange refers to the exchange of heat between two fluids at different temperatures. Usually, the high-temperature fluid transfers energy to the low-temperature fluid through conduction, convection and radiation. In the field of metallurgy, it is very common to use heat exchange to improve energy utilization and reduce losses. Taking the heating furnace as an example, the conventional design to improve the thermal efficiency of the heating furnace is to exchange heat with the flue gas in the furnace and the fuel and combustion-supporting air to increase the combustion temperature and reduce the exhaust temperature. The heat exchange process is completed through a heat exchanger. In order to avoid confusion between the components of the heating medium and the heated medium in the metallurgical field, a partition heat exchange method is generally adopted, that is, the heating medium and the heated medium exchange heat through the partition, and the medium itself does not directly contact.

[0003] Common partition heat exchangers can be divided into shell and tube heat exchange, plate heat exchanger, winding type, sleeve type, tube-in-tube type, etc., and the difference lies in the internal structure. Because there is a partition between the media, the partition heat exchanger usually uses metal materials with low thermal resistance to ensure heat exchange efficiency. Due to the limited temperature resistance of the material, it cannot be used for high-temperature heat exchange, and the operating temperature is usually ≤600℃. In order to achieve high-temperature heat exchange above 600℃, a heat storage heat exchange technology has been developed abroad. Different from partition heat exchange, heat storage heat exchange technology decomposes heat exchange into two processes: heat storage and heat release.

[0004] Using high temperature resistant and high heat capacity materials as the intermediate medium, heat exchange is first performed between the heating medium and the intermediate medium. After the heat is stored to a certain degree, heat exchange is performed between the intermediate medium and the heated medium. In this way, the heat exchange temperature is increased.

[0005] In conventional thermal storage heat exchange technology, the heating medium and the heated medium alternately enter the heat storage body, and the flow direction of the medium needs to be controlled by a valve. Therefore, it is intermittent heat exchange, the medium fluctuates greatly, and the valve direction needs to be switched frequently, resulting in a high failure rate. Summary of the invention

[0006] In view of the above analysis, the present invention aims to provide a heat storage type continuous heat exchange device and a heat exchange method to solve the technical problems that the existing heat exchange device adopts intermittent heat exchange, the medium fluctuates greatly, and requires frequent switching of valve reversing, resulting in a high failure rate.

[0007] The purpose of the present invention is mainly achieved through the following technical solutions:

[0008] The present invention provides a heat storage type continuous heat exchange device, which comprises a movable heat storage body and n medium pipelines arranged side by side, wherein the number of the medium pipelines n≥3 and the efficiency is the highest when n is an odd number, and the efficiency is the second highest when n is an even number; a heat storage body channel is arranged at the same position of each medium pipeline, and each heat storage body channel together constitutes a heat storage body moving channel; the heat storage body moving channel is arranged vertically to the medium pipeline; the movable heat storage body can reciprocate along the heat storage body moving channel;

[0009] The medium pipeline includes a heating medium pipeline and a heated medium pipeline, the heating medium pipeline and the heated medium pipeline are arranged at intervals, and the heated medium pipeline is located on both sides of the heating medium pipeline; the heating medium in the heating medium pipeline and the heated medium in the heated medium pipeline flow in opposite directions;

[0010] The width of the heat exchange area of ​​the mobile heat storage body is equal to the width of n-1 pipes.

[0011] In a possible design, the moving heat storage body moves a distance each time that is equal to the width of a medium pipeline.

[0012] In one possible design, the mobile thermal storage body includes a thermal storage body body;

[0013] The heat storage body is made of porous material, and the pore direction of the heat storage body is the same as the flow direction of the heating medium and the heated medium; the heat storage body as a whole constitutes a heat exchange area.

[0014] In a possible design, the mobile thermal storage body further includes a thermal storage body frame;

[0015] The heat storage body main body is arranged on the heat storage body frame; the heat storage body frame can drive the heat storage body main body to move back and forth along the heat storage body moving channel.

[0016] In a possible design, the heat storage body frame is a hollow rectangular parallelepiped frame; the heat storage body body is a rectangular parallelepiped heat storage body;

[0017] The two ends of the heat storage body frame are respectively a first frame supporting end and a second frame supporting end, the middle is a heat storage body placement groove, and the heat storage body main body is arranged in the heat storage body placement groove.

[0018] In a possible design, the length of the thermal storage body frame is greater than the width of n+1 medium pipes.

[0019] In a possible design, baffles are provided on the sides of the first frame support end and the second frame support end along the pore direction of the heat storage body, and the height of the baffles is equal to the height of the heat storage body frame;

[0020] The baffle is used to prevent the medium from flowing through the corresponding medium pipeline.

[0021] In a possible design, temperature sensors are provided on both sides of the heat storage body moving channel in the heating body medium pipeline and the heated medium pipeline.

[0022] In a possible design, the mobile thermal storage body further includes a driving device;

[0023] The driving device is connected to one end of the heat storage body frame, and the driving device can drive the movable heat storage body to reciprocate along the heat storage body moving channel.

[0024] On the other hand, the present invention also provides a thermal storage type continuous heat exchange method, using the above-mentioned thermal storage type continuous heat exchange device, the thermal storage type continuous heat exchange method comprises the following steps:

[0025] Step 1: At the beginning, the mobile heat storage body is placed on the rightmost side of the medium pipeline, and the heat storage body body spans the other medium pipelines except the leftmost heated medium pipeline; at this time, the part of the heat storage body corresponding to the heating medium pipeline begins to store heat;

[0026] Step 2: Move the mobile heat storage body to the left by at least the width of a medium pipe, and the heat storage body that has completed heat storage exchanges heat with the corresponding heated medium; the heat storage body that has just entered the heating medium pipe begins to exchange heat with the heating medium, thereby storing heat;

[0027] Step 3, repeat the process in step 2, after the heat storage body moves to the leftmost end of the medium pipeline, the heat storage body in the heated medium pipeline starts to release heat to the heated medium, and the heat storage body in the heating medium pipeline starts to absorb heat from the heating medium;

[0028] Step 4: Move the mobile heat storage body to the right in reverse direction, with each movement distance equal to the width of a medium pipe. After moving to the rightmost end, start moving to the left in reverse direction, and repeat this process until continuous heat exchange is completed.

[0029] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0030] (1) The present invention arranges the heating medium pipeline and the heated medium pipeline at intervals, and realizes the heat exchange process by moving the heat storage body without switching the valve. Therefore, compared with the conventional heat storage heat exchange technology, the present invention can realize continuous heat exchange without frequently switching the medium flow direction, and ultimately can reduce medium fluctuations.

[0031] (2) The flow direction of the heating medium of the present invention is opposite to that of the heated medium. The countercurrent heat exchange method can effectively increase the outlet temperature of the heated medium and reduce the outlet temperature of the heating medium, thereby improving the heat exchange efficiency.

[0032] (3) The main body of the heat storage body of the present invention is made of porous ceramic material, which has better heat storage and heat release effects and higher temperature resistance. Most of the existing technologies use partition wall heat exchange, which needs to consider the thermal conductivity of the material, while the present invention uses heat storage heat exchange, which does not need to consider the thermal conductivity of the heat storage body material, but only needs to consider its heat storage property. Therefore, compared with conventional partition wall heat exchange, the heat storage body used in the present invention has higher temperature resistance and can be used for medium heat exchange above 600°C.

[0033] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the embodiments of the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like components throughout the drawings.

[0035] Figure 1 It is a structural schematic diagram of a heat storage type continuous heat exchange device when the number of medium pipes n is 3;

[0036] Figure 2 It is a structural schematic diagram of a mobile heat storage body;

[0037] Figure 3a The working state diagram of the heat storage type continuous heat exchange device when the number of medium pipelines n is 3 and the heat storage body is located at the leftmost side of the medium pipeline;

[0038] Figure 3b The working state diagram of the heat storage type continuous heat exchange device when the number of medium pipelines n is 3 and the heat storage body is located in the middle of the medium pipeline;

[0039] Figure 3c This is a working state diagram of a heat storage type continuous heat exchange device when the number of medium pipelines n is 3 and the heat storage body is located at the rightmost side of the medium pipeline.

[0040] Reference numerals:

[0041] 1-mobile heat storage body; 2-heat storage body body; 3-heat storage body frame; 4-baffle; 5-first frame support end; 6-first heated medium pipeline; 7-heating medium pipeline; 8-second heated medium pipeline; 9-temperature sensor; 10-second frame support end. DETAILED DESCRIPTION

[0042] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0043] In one aspect, the present invention provides a heat storage type continuous heat exchange device, such as Figure 1 and Figure 2 As shown, the heat storage type continuous heat exchange device includes a mobile heat storage body 1 and n medium pipelines arranged side by side, the number of medium pipelines n≥3, the efficiency is highest when n is an odd number, and the efficiency is second when n is an even number; a heat storage body channel is provided at the same position of each medium pipeline, and each heat storage body channel together constitutes a heat storage body moving channel; the heat storage body moving channel is arranged vertically to the medium pipeline; the mobile heat storage body 1 can reciprocate along the heat storage body moving channel; the medium pipeline includes a heating medium pipeline 7 and a heated medium pipeline arranged at intervals, and the heated medium pipeline is located on both sides of the heating medium pipeline 7; the flow directions of the media in adjacent medium pipelines are opposite; the heat exchange area width of the mobile heat storage body 1 is equal to the width of n-1 pipelines.

[0044] Specifically, the heights of the above-mentioned medium pipelines are the same, and the medium pipelines are arranged side by side and parallel to each other; the number n of the medium pipelines is an odd number. Since the heated medium pipelines are located on both sides of the heating medium pipeline 7, the number of heated medium pipelines is (n-1) / 2, and the number of heating medium pipelines 7 is (n-1) / 2+1.

[0045] The heated medium in the heated medium pipeline flows in the opposite direction to the heating medium in the heating medium pipeline 7. Since the width of the heat exchange area of ​​the mobile thermal storage body 1 is greater than or equal to the width of n-1 medium pipelines, no matter which side the mobile thermal storage body 1 moves along the thermal storage body moving channel, the heated medium in the heated medium pipeline can be heated by the thermal storage body, and the thermal storage body in the heating medium pipeline 7 can also be heated by the heating medium. Therefore, the thermal storage type continuous heat exchange device of the present invention can improve the heating efficiency.

[0046] It should be noted that if the number n of medium pipes is an even number, the number of heated medium pipes is equal to the number of heating medium pipes 7; and since the heating medium pipes 7 and the heated medium pipes are arranged at intervals, one of the two sides of all the medium pipes must be a heating medium pipe 7 (that is, the heating medium pipe 7 is on the outside). In this case, when the heat storage body moves from the heating medium pipe 7 to the heated medium pipe, there is no heat storage body in the heating medium pipe 7 located on the outside, so it cannot play a heating role. Therefore, when the number n of medium pipes is an even number, the heating efficiency is low relative to when the number n of medium pipes is an even number. Therefore, the present invention sets the number n of medium pipes to an odd number to improve the heat exchange efficiency.

[0047] Compared with the prior art, the present invention improves the heat exchange temperature through the heat storage heat exchange method; realizes the heat storage / heat release switching process by moving the heat storage body, and there is no need to control the medium flow direction through a valve; adopts a multi-tube interval arrangement to reduce the moving distance of the heat storage body; and maintains the area through which the medium passes stable during the switching process through the design of the baffles on both sides, reducing the fluctuation of the heat exchange effect.

[0048] It should be pointed out that the moving distance of the mobile heat storage body 1 of the present invention each time is equal to the width of a medium pipe. If the moving distance is less than the width of a medium pipe (including the pipe wall thickness and the gap between the two pipes), there must be a section of the heat storage body 2 that cannot exchange heat with the heating medium in the adjacent heating medium pipe 7, thus reducing the heat exchange efficiency of the heat storage body 2. Since the heating medium pipe 7 and the heated medium pipe are arranged at intervals, and the heated medium pipe is located on both sides of the heating medium pipe 7, after the moving distance of the mobile heat storage body 1 exceeds the width of a pipe, all parts of the heat storage body can undergo the heat storage / heat release process, thereby improving the utilization rate of the heat storage body; in addition, the moving distance of the mobile heat storage body 1 has nothing to do with the number of medium pipes, but only with the width of the medium pipes.

[0049] It should be noted that the heights of the medium pipes of the present invention (including the heating medium pipe 7 and the heated medium pipe) are the same, and their widths can be designed according to the physical properties of the medium. The principle is to maintain the optimal heat exchange efficiency between the heating medium, the heated medium and the heat storage body, and to match the heat exchange amounts between the heating medium, the heated medium and the heat storage body.

[0050] The mobile heat storage body 1 of the present invention comprises a heat storage body body; the heat storage body body is made of porous material, the direction of the gaps on the heat storage body body is the same as the flow direction of the heating medium and the heated medium; the heat storage body body itself is a heat exchange area.

[0051] Specifically, the heat storage body of the present invention is made of porous ceramic material, which has better heat storage and heat release effects and higher temperature resistance. Most of the existing technologies use partition-type heat exchange, which needs to consider the thermal conductivity of the material, while the present invention uses heat storage heat exchange, which does not need to consider the thermal conductivity of the heat storage body material, but only needs to consider its heat storage. Therefore, compared with conventional partition-type heat exchange, the heat storage body of the present invention has higher temperature resistance and can be used for medium heat exchange above 600°C.

[0052] In order to realize the reciprocating motion of the heat storage body, the mobile heat storage body 1 of the present invention also includes a heat storage body frame 3; the heat storage body frame 3 is a steel structure, and the heat storage body body is arranged on the heat storage body frame 3; the heat storage body frame 3 can drive the heat storage body body to reciprocate along the heat storage body moving channel.

[0053] Compared with the prior art, the present invention can realize reciprocating motion of the heat storage body by fixing the heat storage body on the heat storage body frame 3, thereby realizing continuous heating of the heated medium by the heat storage body and continuous heat storage of the heat storage body by the heating medium.

[0054] It should be pointed out that the heat storage body frame 3 of the present invention is a hollow rectangular frame; the heat storage body main body is a rectangular heat storage body; the two ends of the heat storage body frame 3 are respectively a first frame support end 5 and a second frame support end 10, and the middle is a heat storage body placement groove, and the heat storage body main body is arranged in the heat storage body placement groove.

[0055] Specifically, the heat storage body moving channel is a rectangular cavity, and the shape and size of the heat storage body moving channel match the heat storage body frame 3; on the heat storage body frame 3, the heat storage body placement groove is a rectangular cavity, and the heat storage body body is fixed in the rectangular cavity, and the shape and size of the heat storage body placement groove match the shape and size of the heat storage body body; the direction of the pores on the heat storage body body is parallel to the flow direction of the heating medium and the heated medium, and when the heating medium or the heated medium passes through the pores on the heat storage body body, heat exchange with the heat storage body body can be achieved.

[0056] In order to facilitate the movement of the heat storage body 1 frame and obtain the maximum heat exchange area, the length of the heat storage body frame 3 of the present invention is greater than the width of n medium pipes + the moving distance (the moving distance is greater than or equal to the width of 1 medium pipe). For example, when n=3, the length of the heat storage body frame 3 is greater than the width of 4 medium pipes.

[0057] Specifically, the purpose of setting the length of the heat storage body frame 3 to be greater than the width of the n medium pipes is that no matter where the heat storage body main body is located in the medium pipes arranged side by side, one end of the heat storage body frame 3 is always located outside the n medium pipes; when the position of the heat storage body main body needs to be changed, the position of the entire mobile heat storage body 1 is changed through the heat storage body frame 3 located on the outside, and finally the position of the heat storage body main body is changed.

[0058] During the operation of the heat storage type continuous heat exchange device, in order to prevent the heated medium that is not in the heat exchange area of ​​the mobile heat storage body 1 from flowing through the heated medium pipeline, baffles 4 are provided on the sides of the first frame support end 5 and the second frame support end 10 along the pore direction of the heat storage body, and the height of the baffles 4 is equal to the height of the heat storage body frame 3.

[0059] In order to more clearly illustrate the role of the baffle 4, taking the example where the number of medium pipes n is 3 and the length of the heat storage body is equal to the width of two adjacent medium pipes, correspondingly, the medium channel includes a first heated medium pipe 6, a heating medium pipe 7 and a second heated medium pipe 8 arranged side by side; wherein the first heated medium pipe 6 and the second heated medium pipe 8 are located on both sides of the heating medium pipe 7, and the flow directions of the heated media in the first heated medium pipe 6 and the second heated medium pipe 8 are the same and are opposite to the flow direction of the heating medium in the heating medium pipe 7.

[0060] When the heat storage continuous heat exchange device with n=3 starts working, Figure 3a It is a heat exchange state during operation, wherein the heat storage body is located on the right side of the medium pipeline, that is, the heat storage body spans the heating medium pipeline 7 and the second heated medium pipeline 8. At this time, the first frame support end 5 is located in the first heated medium pipeline 6, and the heat storage body is correspondingly located in the heating medium pipeline 7 and the second heated medium pipeline 8. The second frame support end 10 is located outside the heat storage body moving channel. Since the first frame support end 5 is provided with a baffle 4 along the gap direction on the heat storage body body, the baffle 4 can prevent the heated medium in the first heated medium pipeline 6 from flowing along its corresponding pipeline. Therefore, in Figure 3a In this state, the heated medium in the first heated medium pipeline 6 will not pass through the pipeline. At this time, only the corresponding media in the heating medium pipeline 7 and the second heated medium pipeline 8 flow. When the heating medium passes through the heat storage body, the heating medium will exchange heat with its corresponding heat storage body body part, that is, the heating medium releases heat and the heat storage body absorbs heat; at the same time, the heated medium in the second heated medium pipeline 8 will exchange heat with its corresponding heat storage body body part, that is, the heat storage body releases heat and the heated medium absorbs heat, and the flow directions between the heating medium and the heated medium are opposite.

[0061] As the heat exchange proceeds, the heat storage body moves to the right at a certain speed. Figure 3bWhen n=3, the heat storage type continuous heat exchange device is in another heat exchange state (intermediate state) when working, wherein the heat storage body moves rightward to the middle position of the medium pipes arranged side by side, that is, the heat storage body spans part of the first heated medium pipe 6, spans the entire heating medium pipe 7 and spans part of the second heated medium pipe 8. At this time, the first frame support end 5 is partially located in the first heated medium pipe 6, and the second frame support end 10 is partially located in the second heated medium pipe 8. Since the first frame support end 5 and the second frame support end 10 are provided with baffles 4 along the gap direction on the heat storage body, the baffles 4 can correspondingly reduce the flow rate of the heated medium in the first heated medium pipe 6 and the second heated medium pipe 8 to ensure that the total amount of the heated medium remains unchanged (since the total amount of the heating medium remains unchanged, in order to ensure the heating effect of the heated medium, it is necessary to ensure that the total amount of the heated medium remains unchanged); Figure 3a In the process, the heat storage body in the heating medium pipeline 7 is already in a high temperature state due to heat absorption. When it is moved to the first heated medium pipeline 6, it can release heat to the heated medium therein; Figure 3a In the process, the temperature of the part of the heat storage body in the second heated medium pipeline 8 decreases due to heat exchange with the heated medium. Figure 3b After being moved into the heating medium pipeline 7, the temperature can be increased by heat exchange with the heating medium.

[0062] The mobile heat storage body 1 continues to move to the left until Figure 3c In the position shown, at this time, the heat storage body is located on the left side of the medium pipeline, that is, the heat storage body spans the first heated medium pipeline 6 and the heating medium pipeline 7. At this time, the second frame support end 10 is located in the second heated medium pipeline 8, and the heat storage body is correspondingly located in the first heated medium pipeline 6 and the heating medium pipeline 7. The first frame support end 5 is located outside the heat storage body moving channel. Since the second frame support end 10 is provided with a baffle 4 along the gap direction on the heat storage body, the baffle 4 can prevent the heated medium in the second heated medium pipeline 8 from flowing along its corresponding pipeline. Therefore, in Figure 3c In this state, the heated medium in the second heated medium pipeline 8 will not pass through the pipeline. At this time, only the corresponding media in the heating medium pipeline 7 and the first heated medium pipeline 6 flow. When the heating medium passes through the heat storage body, the heating medium will exchange heat with its corresponding heat storage body body part, that is, the heating medium releases heat and the heat storage body absorbs heat; at the same time, the heated medium in the first heated medium pipeline 6 will exchange heat with its corresponding heat storage body body part, that is, the heat storage body releases heat and the heated medium absorbs heat, and the flow directions of the heating medium and the heated medium are opposite.

[0063] It should be noted that the heat storage body 2 is composed of Figure 3a The position shown in FIG. 1 (i.e., the heat storage body 2 is located at the leftmost end of the medium pipeline) is moved to Figure 3c After the heat storage body 2 reaches the position shown (i.e., the heat storage body 2 is located at the rightmost end of the medium pipeline), it starts to move in the opposite direction to the right (from the first heated medium pipeline 6 to the heating medium pipeline 7 to the second heated medium pipeline 8). The part of the heat storage body 2 that was originally located in the first heated medium pipeline 6 and exchanged heat with the heated medium begins to enter the heating medium pipeline 7 to absorb heat and heat up after the temperature is lowered due to the heat exchange. After the heat storage body 2 is completed, it enters the second heated medium pipeline 8 and exchanges heat with the heated medium therein to cool down. After the heat storage body 2 moves to the rightmost end, it starts to move in the opposite direction and reciprocates in the order of a→b→c→b→a. During the circulation process, the heating medium in the heating medium pipeline 7 always passes through the pores on the heat storage body 2, and the total flow area of ​​the heated medium in the first heated medium pipeline 6 and the second heated medium pipeline 8 remains unchanged, but the flow ratio changes with the different positions of the heat storage body 2. In this way, the change of flow velocity caused by medium reversal can be avoided, and continuous and stable high-temperature heat storage and heat exchange can be achieved, which is beneficial to the utilization of the medium after heat exchange.

[0064] Compared with the prior art, the present invention is provided with baffles 4 on the sides of the first frame support end 5 and the second frame support end 10 along the upper side of the heat storage body, so that the flow and distribution of the heating medium or the heated medium in the medium pipes on both sides of the heat exchange area can be prevented during the reciprocating motion of the mobile heat storage body 1, thereby achieving efficient heat exchange.

[0065] It should be noted that when the number of medium pipes n=3, the total flow area and total flow rate of the heated medium in the first heated medium pipe 6 and the second heated medium pipe 8 are equal to the flow area and flow rate in one heated medium pipe, so as to avoid large changes in the flow rate and speed of the heating medium during the movement of the heat storage body frame 3.

[0066] It should be noted that, in the present invention, the baffle 4 provided on the side of the first frame support end 5 and the second frame support end 10 can also seal the outer gaps of the first heated medium pipeline 6 and the second heated medium pipeline 8 .

[0067] In order to be able to grasp the heat storage or heat release of the heat storage body in the medium pipeline in real time, and then to be able to move the heat storage body 1 frame in time to change the position of the heat storage body 2, the present invention provides temperature sensors 9 on both sides of the heat storage body moving channel in the heating body medium pipeline and the heated medium pipeline.

[0068] Specifically, for the heating medium pipeline 7 that is storing heat in the heat storage body, the heat absorption of the heat storage body is judged by the temperature difference m of the temperature sensors 9 located on both sides of the heat storage body moving pipeline in the pipeline. When the temperature difference between the two temperature sensors 9 is large (less than or equal to m°C), it means that the heat absorption of the heat storage body is obvious, and when the temperature of the two temperature sensors 9 is small (less than or equal to m°C), it means that the heat exchange between the heat storage body and the heating medium in the heating medium pipeline 7 is close to equilibrium. At this time, the position of the heat storage body is changed by moving; or, for the heat storage body 2 that is releasing heat, The heating medium pipeline judges the heat release of the heat storage body through the temperature difference of the temperature sensors 9 located on both sides of the heat storage body moving pipeline in the pipeline. When the temperature difference between the two temperature sensors 9 is large (greater than m°C), it indicates that the heat release of the heat storage body is obvious. When the temperature difference between the two temperature sensors 9 is small (greater than m°C), it indicates that the heat exchange between the heat storage body and the heating medium in the heating medium pipeline 7 is close to equilibrium. At this time, the position of the heat storage body is changed by movement. It should be noted that the value of m is determined according to the heat exchange between the heating / heated medium and the heat storage body, and m is 10-100°C.

[0069] In actual operation, the heat storage body frame 3 moves continuously from one side of the medium pipeline to the other side, and moves continuously in the opposite direction after reaching the limit. By adjusting and controlling the moving speed of the heat storage body 2, a high heat exchange efficiency can be maintained. The heat exchange efficiency is still determined by the temperature sensors 9 on both sides of the heat storage body 2. A large temperature difference between the two temperature sensors 9 indicates a high heat exchange efficiency, and a small temperature difference indicates a low heat exchange efficiency.

[0070] Compared with the prior art, the present invention arranges two temperature sensors 9 on both sides of the mobile heat storage body 1 in the medium pipeline. By judging the temperature difference between the two, the heat storage or heat release condition of the heat storage body main body is judged. The position of the heat storage body main body 2 can be changed in time by moving the heat storage body 1 frame to improve the heat exchange efficiency.

[0071] In order to be able to move the heat storage body 1 in time, the mobile heat storage body 1 of the present invention also includes a driving device; the driving device is connected to one end of the heat storage body frame 3, and the driving device can drive the mobile heat storage body 1 to reciprocate along the heat storage body moving channel.

[0072] Specifically, the driving device includes a driving motor, and the driving motor is fixedly connected to the outer end of the first frame supporting end 5 or the second frame supporting end 10 .

[0073] Compared with the prior art, the present invention drives the heat storage body frame 3 by driving the motor, thereby realizing the reciprocating motion of the heat storage body body 2 along the heat storage body moving channel.

[0074] It should be emphasized that in the present invention, since the heating medium and the heated medium do not exchange heat directly, but exchange heat indirectly through the heat storage body 2, the heat exchange efficiency is adjusted by adjusting the movement of the heat storage body 2. The heat exchange efficiency can be described by the following formula:

[0075] η1=aη / L (1)

[0076] In the above formula (1), η1 is the heat transfer efficiency; a is the moving distance; η is the heat transfer efficiency when the moving distance is L; L is the width of the medium pipeline.

[0077] It should be noted that when the number of medium pipes n≥5, the baffle 4 can be cancelled; this is because when the number of medium pipes n≥5, due to the existence of the intermediate pipe (the pipe located in the middle position of the medium pipes arranged side by side), the fluctuation caused by the opening and closing of the heated medium pipes on both sides will decrease as the number of medium pipes increases. At the same time, as the number of pipes increases, the phenomenon of reduced heat exchange efficiency caused by the mixing of the heated media will also decrease. From the perspective of simplifying the structure, the baffle 4 can be considered to be cancelled.

[0078] It should be noted that temperature sensors 9 are provided on both sides of the heat storage body moving channel in the heating medium pipeline 7 and the heated medium pipeline; the temperature sensor 9 is used to measure the temperature of the heating medium or the heated medium entering and exiting the heat storage body 2, and the heat absorption / heat release of the heat storage body is judged by the temperature difference between the two temperature sensors 9; when the temperature difference between the two sensors is large, it means that the heat absorption / heat release of the heat storage body is obvious; when the temperature difference between the two sensors is small, it means that the heat exchange between the heat storage body and the medium in the medium pipeline is close to equilibrium, and the position of the heat storage body needs to be changed by moving.

[0079] To further improve the heat exchange efficiency, the present invention also provides a heat storage type continuous heat exchange system, which includes a plurality of heat storage type continuous heat exchange devices connected in series, and the mobile heat storage body 1 in each heat storage type continuous heat exchange device moves independently to adjust the heat exchange state.

[0080] Compared with the prior art, the present invention arranges multiple groups of heat exchangers in series, which has a higher space utilization rate.

[0081] The present invention also provides a heat storage type continuous heat exchange method, using the above-mentioned heat storage type continuous heat exchange device, the method comprises the following steps:

[0082] Step 1: Arrange the heating medium pipeline and the heated medium pipeline side by side with each other, and the heated medium pipeline is located on both sides of the heating medium pipeline; the total number of medium pipelines is n, and n≥3; place the mobile heat storage body in the heat storage body moving channel on the medium pipeline;

[0083] In the above step 1, the mobile thermal storage body 1 is placed on the far right side of the medium pipeline, and the thermal storage body 2 spans the other medium pipelines except the leftmost heated medium pipeline; at this time, the thermal storage body 2 corresponding to the heating medium pipeline 7 starts to absorb heat to store heat;

[0084] It should be noted that before the heat storage type continuous heat exchange device starts working, the mobile heat storage body 1 can also be placed on the leftmost side of the medium pipeline, and its effect is the same as that of being placed on the rightmost side of the medium pipeline; its essence is to use the heating medium to heat the heat storage body, and use the heat storage body to release heat to the heated medium, thereby completing continuous heat exchange.

[0085] Step 2: After the heat storage body is heated by the heating medium, the heat storage body frame is moved along the heat storage body moving channel to change the position of the heat storage body body, the heated medium in the heated medium pipeline is heated by the heat storage body after heat storage, and the heating medium in the heating medium pipeline is used to heat the corresponding heat storage body;

[0086] In the above step 2, the heat storage body 1 is moved to a width of a medium pipe, and the heat storage body 2 that has completed heat storage begins to exchange heat with the corresponding heated medium; the heat storage body 2 that has just entered the heating medium pipe 7 begins to exchange heat with the heating medium, thereby storing heat.

[0087] Step 3: After the heat storage body 2 moves to the leftmost end of the medium pipeline, the heat storage body in the heated medium pipeline starts to release heat to the heated medium, and the heat storage body in the heating medium pipeline 7 starts to absorb heat from the heating medium, and the heat storage process is carried out;

[0088] Step 4: The heat storage body moving frame starts to move in the opposite direction to the right, and after moving to the rightmost end, it starts to move in the opposite direction to the left, and moves back and forth like this to complete continuous heat exchange.

[0089] In order to more clearly illustrate the heat storage type continuous heat exchange method of the present invention, the number of medium pipelines n=3 is taken as an example for explanation, which specifically includes the following process:

[0090] (1) The main body of the heat storage body is located on the right side of the medium pipeline. Figure 3a As shown, the heat storage body main body spans the heating medium pipeline 7 and the second heated medium pipeline 8. At this time, the first frame support end 5 is located in the first heated medium pipeline 6, the heat storage body main body is correspondingly located in the heating medium pipeline 7 and the second heated medium pipeline 8, and the second frame support end 10 is located outside the heat storage body moving channel. Since the first frame support end 5 is provided with a baffle 4 along the gap direction on the heat storage body main body, the baffle 4 can prevent the heated medium in the first heated medium pipeline 6 from flowing along its corresponding pipeline, therefore, Figure 3aIn this state, the heated medium in the first heated medium pipeline 6 will not pass through the pipeline. At this time, only the corresponding media in the heating medium pipeline 7 and the second heated medium pipeline 8 flow. When the heating medium passes through the heat storage body, the heating medium will exchange heat with its corresponding heat storage body body part, that is, the heating medium releases heat and the heat storage body absorbs heat; at the same time, the heated medium in the second heated medium pipeline 8 will exchange heat with its corresponding heat storage body body part, that is, the heat storage body releases heat and the heated medium absorbs heat, and the flow directions between the heating medium and the heated medium are opposite.

[0091] As the heat exchange proceeds, the heat storage body moves to the right at a certain speed. Figure 3b When n=3, another heat exchange state of the heat storage type continuous heat exchange device is in operation, wherein the heat storage body moves rightward to the middle position of the medium pipes arranged side by side, that is, the heat storage body spans part of the first heated medium pipe 6, spans the entire heating medium pipe 7 and spans part of the second heated medium pipe 8. At this time, the first frame support end 5 is partially located in the first heated medium pipe 6, and the second frame support end 10 is partially located in the second heated medium pipe 8. Since baffles 4 are provided on the first frame support end 5 and the second frame support end 10 along the gap direction on the heat storage body body, the baffles 4 can correspondingly reduce the flow rate of the heated medium in the first heated medium pipe 6 and the second heated medium pipe 8 to ensure that the total amount of the heated medium remains unchanged (since the total amount of the heating medium remains unchanged, in order to ensure the heating effect of the heated medium, it is necessary to ensure that the total amount of the heated medium remains unchanged); Figure 3a In the process, the heat storage body in the heating medium pipeline 7 is already in a high temperature state due to heat absorption. When it is moved to the first heated medium pipeline 6, it can release heat to the heated medium therein; Figure 3a In the process, the temperature of the part of the heat storage body in the second heated medium pipeline 8 decreases due to heat exchange with the heated medium. Figure 3b After being moved into the heating medium pipeline 7, the temperature can be increased by heat exchange with the heating medium.

[0092] The mobile heat storage body 1 continues to move to the left until Figure 3c In the position shown, at this time, the heat storage body is located on the left side of the medium pipeline, that is, the heat storage body spans the first heated medium pipeline 6 and the heating medium pipeline 7. At this time, the second frame support end 10 is located in the second heated medium pipeline 8, and the heat storage body is correspondingly located in the first heated medium pipeline 6 and the heating medium pipeline 7. The first frame support end 5 is located outside the heat storage body moving channel. Since the second frame support end 10 is provided with a baffle 4 along the gap direction on the heat storage body, the baffle 4 can prevent the heated medium in the second heated medium pipeline 8 from flowing along its corresponding pipeline. Therefore, in Figure 3cIn this state, the heated medium in the second heated medium pipeline 8 will not pass through the pipeline. At this time, only the corresponding media in the heating medium pipeline 7 and the first heated medium pipeline 6 flow. When the heating medium passes through the heat storage body, the heating medium will exchange heat with its corresponding heat storage body body part, that is, the heating medium releases heat and the heat storage body absorbs heat; at the same time, the heated medium in the first heated medium pipeline 6 will exchange heat with its corresponding heat storage body body part, that is, the heat storage body releases heat and the heated medium absorbs heat, and the flow directions of the heating medium and the heated medium are opposite.

[0093] It should be noted that the heat storage body 2 is composed of Figure 3a The position shown in FIG. 1 (i.e., the heat storage body 2 is located at the leftmost end of the medium pipeline) is moved to Figure 3c After the heat storage body 2 reaches the position shown (i.e., the heat storage body 2 is located at the rightmost end of the medium pipeline), it starts to move in the opposite direction to the right (from the first heated medium pipeline 6 to the heating medium pipeline 7 to the second heated medium pipeline 8). The part of the heat storage body 2 that was originally located in the first heated medium pipeline 6 and exchanged heat with the heated medium begins to enter the heating medium pipeline 7 to absorb heat and heat up after the temperature is lowered due to the heat exchange. After the heat storage body 2 is completed, it enters the second heated medium pipeline 8 and exchanges heat with the heated medium therein to cool down. After the heat storage body 2 moves to the rightmost end, it starts to move in the opposite direction and reciprocates in the order of a→b→c→b→a. During the circulation process, the heating medium in the heating medium pipeline 7 always passes through the pores on the heat storage body 2, and the total flow area of ​​the heated medium in the first heated medium pipeline 6 and the second heated medium pipeline 8 remains unchanged, but the flow ratio changes with the different positions of the heat storage body 2.

[0094] Compared with the prior art, the heat exchange method provided by the present invention can avoid the change in flow velocity caused by the reversal of the medium, realize continuous and stable high-temperature heat storage and heat exchange, and is beneficial to the utilization of the medium after heat exchange.

[0095] It should be pointed out that when the number of medium pipes n≥5, the heat exchange process of the heat storage type continuous heat exchanger is basically the same as when the number of medium pipes n=3. The only difference is that the baffle 4 on the first frame support end 5 and the second frame support end 10 is removed, which will not be repeated here.

[0096] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A heat storage continuous heat exchange device, characterized in that: The invention comprises a movable heat storage body and n medium pipelines arranged side by side, wherein the number of the medium pipelines n is greater than or equal to 3; a heat storage body channel is arranged at the same position of each of the medium pipelines, and each of the heat storage body channels together constitutes a heat storage body movable channel; the heat storage body movable channel is arranged vertically to the medium pipeline; and the movable heat storage body can reciprocate along the heat storage body movable channel; The medium pipeline comprises a heating medium pipeline and a heated medium pipeline, the heating medium pipeline and the heated medium pipeline are arranged at intervals, and the heated medium pipeline is located on both sides of the heating medium pipeline; the heating medium in the heating medium pipeline and the heated medium in the heated medium pipeline flow in opposite directions; The width of the heat exchange area of ​​the mobile heat storage body is equal to the width of n-1 pipes.

2. The thermal storage continuous heat exchange device according to claim 1, characterized in that: The moving distance of the movable heat storage body each time is equal to the width of a medium pipeline.

3. The heat storage type continuous heat exchange device according to claim 2, characterized in that: The mobile heat storage body comprises a heat storage body main body; The heat storage body is made of a porous material, and the pore direction of the heat storage body is the same as the flow direction of the heating medium and the heated medium; the heat storage body as a whole constitutes a heat exchange area.

4. The heat storage type continuous heat exchange device according to claim 3, characterized in that: The mobile thermal storage body also includes a thermal storage body frame; The heat storage body main body is arranged on the heat storage body frame; the heat storage body frame can drive the heat storage body main body to move back and forth along the heat storage body moving channel.

5. The heat storage type continuous heat exchange device according to claim 4, characterized in that: The heat storage body frame is a hollow rectangular frame; the heat storage body body is a rectangular heat storage body; The two ends of the heat storage body frame are respectively a first frame supporting end and a second frame supporting end, and the middle is a heat storage body placement groove, and the heat storage body main body is arranged in the heat storage body placement groove.

6. The heat storage type continuous heat exchange device according to claim 5, characterized in that: The length of the heat storage body frame is greater than the width of n+1 medium pipes.

7. The thermal storage continuous heat exchange device according to claim 5, characterized in that: Along the pore direction of the heat storage body, baffles are provided on the side surfaces of the first frame support end and the second frame support end, and the height of the baffles is equal to the height of the heat storage body frame; The baffle is used to prevent the medium from flowing through the corresponding medium pipeline.

8. The thermal storage continuous heat exchange device according to claim 7, characterized in that: In the heating medium pipeline and the heated medium pipeline, temperature sensors are arranged on both sides of the heat storage body moving channel.

9. The thermal storage continuous heat exchange device according to claim 1, characterized in that: The mobile heat storage body also includes a driving device; The driving device is connected to one end of the heat storage body frame, and the driving device can drive the movable heat storage body to reciprocate along the heat storage body moving channel.

10. A heat storage continuous heat exchange method, characterized in that: The heat storage type continuous heat exchange device according to any one of claims 1 to 9 is used, and the heat storage type continuous heat exchange method comprises the following steps: Step 1: At the beginning, the mobile heat storage body is placed on the rightmost side of the medium pipeline, and the heat storage body body spans the other medium pipelines except the leftmost heated medium pipeline; at this time, the part of the heat storage body corresponding to the heating medium pipeline begins to store heat; Step 2: Move the mobile heat storage body to the left by at least the width of a medium pipe, and the heat storage body that has completed heat storage exchanges heat with the corresponding heated medium; the heat storage body that has just entered the heating medium pipe begins to exchange heat with the heating medium, thereby storing heat; Step 3, repeat the process in step 2, after the heat storage body moves to the leftmost end of the medium pipeline, the heat storage body in the heated medium pipeline starts to release heat to the heated medium, and the heat storage body in the heating medium pipeline starts to absorb heat from the heating medium; Step 4: Move the mobile heat storage body to the right in reverse direction, with each movement distance equal to the width of a medium pipe. After moving to the rightmost end, start moving in the reverse direction to the left, and move back and forth in this way until continuous heat exchange is completed.

Images