Direct mixing heat exchange heat exchanger

Abstract

The invention relates to a direct mixing heat exchange heat exchanger which comprises a hot fluid inlet pipeline, a cold fluid inlet pipeline and a heat exchange fluid outlet pipeline, the cold fluid inlet pipeline is perpendicular to the hot fluid inlet pipeline and the heat exchange fluid outlet pipeline, and the cold fluid inlet pipeline is arranged between the hot fluid inlet pipeline and the heat exchange fluid outlet pipeline. A flow adjusting device is arranged in the hot fluid inlet pipeline and is of a grid structure, the grid structure is provided with a plurality of grid pieces, the grid pieces are arranged in the direction perpendicular to the central axis of the cold fluid inlet pipeline, the inclination angles of the adjacent grid pieces are different, and the closer the distance to the cold fluid inlet pipeline is, the smaller the flow adjusting device is. The included angle between the grating pieces and the cold fluid flowing direction in the central axis direction of the cold fluid inlet pipeline becomes larger and larger. According to the heat exchanger with the direct mixing heat exchange function, the heat exchange efficiency can be improved through angle arrangement of the grating pieces.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a direct mixed heat exchange heat exchanger. Background Art

[0002] Hybrid heat exchangers rely on direct contact between cold and hot fluids to transfer heat. This heat transfer method avoids the thermal resistance of dirt on the heat transfer partition and its two sides. As long as the contact between the fluids is good, there will be a higher heat transfer rate. Currently, they are mainly divided into water-water hybrid and steam-water hybrid heat exchangers. The water-water hybrid type is widely used because of its low cost, energy saving, environmental protection and high conversion efficiency.

[0003] The fluid stability and accuracy of hybrid heat exchangers are crucial. However, hybrid heat exchangers generally have the problem of uneven flow velocity in the tube. However, the current solution focuses on improving the accuracy of measuring instruments and installing more flow equalization devices, which does not fundamentally solve the problem caused by the uneven upstream hot fluid. In addition, the additional installation of more flow equalization devices makes the three-dimensional pipeline structure complicated, increases costs, and will cause a large pressure drop and increase operating costs.

[0004] Therefore, based on the above problems, a new type of flow balancing device is needed, and the prismatic pipe needs to be improved to balance the flow, improve the flow field and temperature field state at the measuring device under the premise of small pressure loss, and improve the heat exchange efficiency of the heat exchanger.

[0005] The hybrid heat exchanger used in the prior art adopts spraying and other methods to make the heat exchange uniform and improve the heat exchange efficiency during use. However, the spraying and other structures increase the cost. The main problem is that the temperature of a specific range cannot be adjusted according to actual needs, resulting in a limited scope of use. Some heat exchangers integrated with precision detection instruments such as sensors are expensive and cannot be widely used. In addition, when the heat exchanger fails and heat exchange with cold water cannot be achieved, it is easy to cause scalding of users.

[0006] Therefore, based on the above problems, a heat exchange device is needed, which can achieve uniform flow in the entire heat exchange channel and improve heat exchange efficiency by providing a flow regulating device for the fluid channel. Summary of the invention

[0007] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide a hybrid heat exchange system which has flow regulation function as well as rectification and flow balancing function, so as to improve the heat exchange efficiency.

[0008] To achieve the above objectives, the present invention adopts the following technical solutions: A direct mixed heat exchange heat exchanger comprises a hot fluid inlet pipe, a cold fluid inlet pipe and a heat exchange fluid outlet pipe, wherein the cold fluid inlet pipe is arranged perpendicularly to the hot fluid inlet pipe and the heat exchange fluid outlet pipe, the cold fluid inlet pipe is arranged between the hot fluid inlet pipe and the heat exchange fluid outlet pipe, a flow regulating device is arranged in the hot fluid inlet pipe, the flow regulating device is a grid structure, a plurality of grid sheets are arranged in the grid structure, the grid sheets are arranged perpendicularly to the central axis direction of the cold fluid inlet pipe, adjacent grid sheets have different inclination angles, and as the distance from the cold fluid inlet pipe increases, the angle between the grid sheet and the cold fluid flow direction in the central axis direction of the cold fluid inlet pipe becomes larger and larger.

[0009] Preferably, as the distance from the cold fluid inlet pipe increases, the angle between the grid sheet and the cold fluid flow direction in the direction of the central axis of the cold fluid inlet pipe increases continuously.

[0010] Preferably, the heat exchange fluid outlet pipe is provided with an outlet flow regulating device, and the flow regulating device is a grid structure, the grid structure is provided with a plurality of grid plates, and the grid plates are arranged parallel to the central axis direction of the cold fluid inlet pipe.

[0011] Preferably, a mixing device is arranged downstream of the outlet flow regulating device, and the mixing device is a grid structure, and the grid structure includes a plurality of grids, and adjacent grids are split regulating structures.

[0012] Preferably, a plurality of mixing devices are provided, and the mixing mechanism grid includes a parallel structure arranged parallel to the central axis direction of the cold fluid inlet pipe and a vertical structure arranged perpendicular to the central axis direction of the cold fluid inlet pipe, and the parallel structure and the vertical structure are arranged alternately.

[0013] Compared with the prior art, the present invention has the following advantages: 1) Based on the existing heat exchanger, a hybrid heat exchanger with flow regulation, rectification and flow balancing functions is creatively proposed. By setting grid plates and setting the grid plates at different angles, the overall heat exchange efficiency is improved; 2) Based on the existing heat exchanger, a hybrid heat exchanger with flow regulation, rectification and equalization functions is creatively proposed. It contains two upstream and downstream split flow regulation devices to achieve dual control and dual equalization, solving the problem from the source of uneven inlet flow velocity. The equalization effect is obvious, which can improve the accuracy and stability of inlet flow and temperature measurement, thereby improving the economy and stability of the heat exchange system. In addition, the device has a simple structure, avoiding the problems of excessive pressure drop and increased operating costs caused by the additional installation of equalization devices in the existing equalization technology, and has high economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a schematic diagram of the overall structure of the hybrid heat exchanger of the present invention; Figure 2 A partial three-dimensional structural schematic diagram of a hybrid heat exchanger provided by the present invention is shown; Figure 3 A schematic diagram of the grid structure of the present invention is shown; Figure 4 The split grille structure of the present invention is shown. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be supplemented below with reference to the accompanying drawings in the embodiments of the present invention.

[0016] Figure 1-4 The schematic diagram of the structure of the hybrid heat exchanger of the present invention is shown. Figure 1 As shown, a hybrid heat exchanger, in which hot fluid and cold fluid are directly mixed for heat exchange, comprises a hot fluid inlet pipe 1, a cold fluid inlet pipe 2 and a heat exchange fluid outlet pipe 3, as shown in FIG. Figure 1 As shown, the cold fluid inlet pipe 2 is arranged vertically with the hot fluid inlet pipe 1 and the heat exchange fluid outlet pipe 3, the cold fluid inlet pipe 2 is arranged between the hot fluid inlet pipe 1 and the heat exchange fluid outlet pipe 3, and the hot fluid inlet pipe 1 is provided with a flow regulating device 4, as shown in FIG. Figure 2 As shown, the flow regulating device is a grid structure, and the grid structure is provided with a plurality of grid plates, and the grid plates are arranged perpendicular to the central axis direction of the cold fluid inlet pipe.

[0017] The hot fluid inlet pipe 1 is located upstream, the heat exchange fluid outlet pipe 3 is located downstream, the cold fluid inlet pipe 2 is arranged in the middle pipe between the hot fluid inlet pipe 1 and the heat exchange fluid outlet pipe 3 and extends outward from the middle pipe, the hot fluid inlet pipe 1 and the heat exchange fluid outlet pipe 3 are respectively provided with an inlet flow regulating device 4 and an outlet flow regulating device 5, a cold fluid flow regulating device 6 is arranged on the cold fluid inlet pipe 2, the cold fluid inlet pipe 2 is arranged on the pipe between the inlet flow regulating device 4 and the outlet flow regulating device 5, and the inlet flow regulating device 4 and the outlet flow regulating device 5 are multi-grid structures.

[0018] Based on the existing heat exchanger, a creative inlet flow regulation system with flow regulation function, rectification and equalization function is proposed. It includes two upstream and downstream split adjustment devices to achieve dual control and dual equalization, solving the problem from the source of uneven inlet fluid flow rate. The equalization effect is obvious, which can improve the accuracy and stability of inlet flow and temperature measurement, thereby improving the economy and stability of the heat exchange system. In addition, the device has a simple structure, avoiding the problems of excessive pressure drop and increased operating costs caused by the additional installation of equalization devices in the existing equalization technology, and has high economic benefits.

[0019] Adjacent grid pieces of the flow regulating device 4 have different inclination angles. As the distance from the cold fluid inlet pipe increases, the angle between the grid piece and the cold fluid flow direction in the central axis direction of the cold fluid inlet pipe becomes larger and larger.

[0020] Close to the cold fluid inlet, the cold fluid flow is the largest, the heat exchange temperature difference is the largest at this time, and the heat exchange is the best, which will lead to uneven heat exchange overall. The cold fluid outlet has the best heat exchange. As the distance from the outlet increases, the heat exchange becomes worse, which leads to poor overall heat exchange effect, forming a heat exchange similar to that of a downstream heat exchanger. As the distance from the cold fluid inlet increases, the flow of the cold fluid becomes smaller and smaller. The present invention improves the grid angle so that the hot fluid flow increases along the direction in which the cold fluid enters the fluid channel, and the heat exchange of the entire heat exchange area is balanced, forming a technical effect similar to that of countercurrent heat exchange, thereby improving the heat exchange efficiency overall.

[0021] Preferably, as the distance from the cold fluid inlet pipe increases, the angle between the grid sheet and the cold fluid flow direction in the central axis direction of the cold fluid inlet pipe increases. By changing the angle, the heat exchange effect can be better improved and the overall heat exchange can be more uniform.

[0022] Preferably, the outlet pipe of the heat exchange fluid is provided with an outlet flow regulating device 5, wherein the flow regulating device is a grid structure, and the grid structure is provided with a plurality of grid sheets, and the grid sheets are arranged parallel to the central axis direction of the cold fluid inlet pipe. When the flow regulating device is partially opened, each set of two grid sheets opened opposite each other can guide the flow to both sides. The flow regulating device 4 can diffuse the flow velocity in the horizontal direction, and the flow regulating device 5 can diffuse the flow velocity in the vertical direction; after the flow regulating devices 4 and 5 are combined, since the two sets of fluid gates are perpendicular to each other, the flow can be diffused in the horizontal and vertical directions, and the degree of homogenization is higher.

[0023] Preferably, a mixing device 7 is arranged downstream of the outlet flow regulating device, and the mixing device is a grid structure, and the grid structure includes a plurality of grids, and adjacent grids are split regulating structures.

[0024] Preferably, multiple mixing devices are provided, and the mixing mechanism grid includes a parallel structure arranged in parallel with the central axis direction of the cold fluid inlet pipe and a vertical structure arranged perpendicular to the central axis direction of the cold fluid inlet pipe, and the parallel structure and the vertical structure are arranged alternately. After the mixing device is combined, since the two groups of fluid gates are perpendicular to each other, the flow can be diffused in four directions, horizontally and vertically, and the degree of homogenization is higher.

[0025] When adjacent grid sheets are not arranged in a split configuration, the angle between the grid and the central axis of the cold fluid inlet pipe is selected to be the angle formed by the cold fluid flow direction and the grid sheet extending downstream, for example Figure 3 .

[0026] Preferably, the adjacent grilles are of split-open adjustable structure. Unless otherwise specified, the adjacent grilles described below are all of split-open structure.

[0027] The fluid flow needs to be controlled. The split-type regulating fluid gate of the present invention has both flow balancing and flow regulating functions. In the past, ordinary fluid gates (fluid gates facing one direction) were generally used to control the flow, and orifice plates were used for flow balancing. However, ordinary fluid gates will divert hot fluid from one side to the other, which will aggravate the flow turbulence in the pipeline. Orifice plates will significantly reduce the flow area, resulting in greater resistance.

[0028] As long as the split fluid gate is not close to the closed state, the impact on the flow area is small. The grille of the split fluid gate will make the fluid bypass from both sides of the grille, instead of directing the flow to one side like the ordinary fluid gate. In this process, a certain resistance will be applied to the flow, so that the flow velocity in the area with higher flow velocity is reduced, and the fluid is induced to pass through the area with lower flow velocity. In particular, the use of two sets of mutually perpendicular split fluid gates has a better flow balancing effect. At the same time, changing the grille angle of the split fluid gate (the angle between the grille and the axis of the cold fluid pipeline) can also play a role in regulating the flow.

[0029] Preferably, the cold fluid flow regulating device is a multi-grid structure, and the adjacent grids are split regulating structures. By setting the split regulating structure, the input cold fluid can flow evenly.

[0030] Preferably, the inlet flow regulating device 4, the cold fluid flow regulating device 6 and the outlet flow regulating device 5 are independently regulated. When the fluid gate opening is different, the flow resistance is different and the flow balancing effect is also different. When the device can withstand a larger flow resistance, a smaller fluid gate opening can be used to achieve a better flow balancing effect.

[0031] Preferably, in the multi-leaf split adjustment, each grille can independently control the angle, preferably controlled by a servo motor, and independently adjustable. When the local flow velocity is too high, the nearby grilles can adopt a smaller angle, thereby increasing the local resistance, causing the gas to move in the direction of lower flow velocity, and further improving the uniformity of the flow field. The opening angle of each grille is controlled by a servo motor.

[0032] Preferably, the width of each grid of the multi-leaf split flow regulating device can be determined according to the actual distribution of pipeline fluid. Preferably, the pipeline diameter is 9-11 times the grid plate spacing, preferably 10 times. The above dimensions can make the flow equalization effect obvious, improve the accuracy and stability of inlet flow and temperature measurement, and thus improve the economy and stability of the combustion system. In addition, the device has a simple structure, avoids the problems of excessive pressure drop and increased operating costs caused by the additional installation of flow equalization devices in the existing flow equalization technology, and has high economic benefits.

[0033] Furthermore, the flow regulating system not only has the flow regulating function but also has the functions of rectifying and balancing the flow due to its split form.

[0034] Furthermore, the flow regulation system can achieve dual control and dual flow equalization to achieve a better flow equalization effect. The hot fluid from the hot fluid inlet pipe will first pass through the inlet flow regulating device. After passing through the flow regulating device, its rectification effect makes the hot fluid velocity distribution more uniform. Then the cold fluid is connected. Due to the different temperatures and velocities of the cold fluid, the velocity unevenness and temperature unevenness after mixing increase. The mixed fluid passes through the second multi-leaf split flow regulating device again. After passing through the second flow regulating device, better velocity and temperature uniformity can be achieved.

[0035] Furthermore, in the multi-leaf split flow regulating device, each grille angle is independently adjustable, and preferably each grille angle is controlled by a servo motor. Since the pressure losses caused by the grilles at different opening and closing angles are different, the rectification and flow equalization effects are different. Since the hot fluid main pipe and the hot fluid inlet pipe form a T-shaped structure, the inflowing hot fluid itself has uneven speed, the grille angle can be finely adjusted according to the speed distribution state of the incoming hot fluid.

[0036] Preferably, a / A=ф*(VV p ) / V p ; where a is the changing angle of the grid plate, V is the local velocity near the grid plate, V p is the average velocity of the cross section, and angle A is the current angle of the grid. Where ф is a parameter, and the following data is taken: 0 <A<=30°,0.55<ф<0.60; 30 <A<=60°,0.45<ф<0.55; 60 <A<90°,0.40<ф<0.45; The maximum angle A is 90°.

[0037] Preferably, as A increases, ф decreases.

[0038] When the angle of the grille is small (tending to be closed), the flow resistance is large; conversely, when the angle of the grille is large (tending to be open), the flow resistance is small; if the flow velocity is high at a certain place, the grille nearby should adopt a small angle (tending to be closed), which can induce the fluid to flow to the area with a large grille angle, achieving a flow balancing effect. If all grilles have the same angle, although the flow balancing effect can also be achieved, the effect is worse.

[0039] The above formula and parameters of the present invention are the best angle adjustment parameter formulas obtained through a large number of experiments and numerical simulations. Through the adjustment of the above angle, the best flow equalization effect can be achieved under minimum resistance.

[0040] Preferably, a velocity probe, such as a Pitot tube, is placed near each grid sheet, and the opening angle is the angle between the grid and the axis of the cold fluid pipeline, such as Figure 4 shown.

[0041] When adjacent grid sheets are arranged in a split configuration, the angle between the grid sheet and the central axis of the cold fluid inlet pipe (i.e., the grid angle) is selected to be an acute angle, such as Figure 4 shown.

[0042] Furthermore, the width of each grille of the multi-leaf split flow regulating device can be determined according to the actual pipeline fluid distribution, preferably the width = grille spacing, grille spacing = pipeline diameter / 10; this is because different grille sizes will also bring different pressure losses and different rectification and flow balancing effects, which can be determined according to the velocity distribution and temperature distribution of the incoming fluid to achieve a better flow balancing effect.

[0043] As an improvement, as the distance from the cold fluid inlet gets closer, the angle of the grid of the flow regulating device 4 becomes larger and larger. Close to the cold fluid inlet, the cold fluid flow is the largest, the heat exchange temperature difference is the largest at this time, and the heat exchange is the best, which will lead to uneven heat exchange overall. The heat exchange at the cold fluid outlet is the best. As the distance from the outlet increases, the heat exchange becomes worse, which leads to poor overall heat exchange effect, forming a heat exchange similar to that of a downstream heat exchanger. As the distance from the cold fluid inlet increases, the flow of the cold fluid becomes smaller and smaller. By improving the grid angle, the present invention makes the hot fluid flow larger and larger along the direction in which the cold fluid enters the fluid channel, and the heat exchange of the entire heat exchange area is balanced, forming a technical effect similar to countercurrent heat exchange, and improving the heat exchange efficiency as a whole.

[0044] As a preference, as the distance from the cold fluid inlet gets closer, the angle of the grid of the flow regulating device 4 increases. By changing the angle, the heat exchange effect can be better improved and the overall heat exchange can be more uniform.

[0045] As an improvement, as the distance from the cold fluid inlet gets closer, the size of the grid of the flow regulating device 4 gets larger and larger. Close to the cold fluid inlet, the cold fluid flow is the largest, the heat exchange temperature difference is the largest at this time, and the heat exchange is the best, which will lead to uneven heat exchange overall. The heat exchange at the cold fluid outlet is the best. As the distance from the outlet increases, the heat exchange becomes worse, which leads to poor overall heat exchange effect, forming a heat exchange similar to that of a downstream heat exchanger. As the distance from the cold fluid inlet increases, the flow of the cold fluid becomes smaller and smaller. The present invention improves the grid size so that the grid size changes along the direction in which the cold fluid enters the fluid channel, so that the grid size is the largest at the distance from the cold fluid inlet, and the resistance is the largest, resulting in a reduction in flow. As the distance from the cold fluid outlet increases, the flow increases, so that the heat exchange in the entire heat exchange area is balanced, forming a technical effect similar to countercurrent heat exchange, and improving the heat exchange efficiency as a whole.

[0046] As a preference, as the distance from the cold fluid inlet gets closer, the size of the grid of the flow regulating device 4 increases continuously. By changing the size range, the heat exchange effect can be better improved and the overall heat exchange can be more uniform.

[0047] As an improvement, as the distance from the cold fluid inlet gets closer, the distribution density of the grid of the flow regulating device 4 becomes larger and larger. Close to the cold fluid inlet, the cold fluid flow is the largest, the heat exchange temperature difference is the largest at this time, and the heat exchange is the best, which will lead to uneven heat exchange overall, and the heat exchange at the cold fluid outlet is the best. As the distance from the outlet increases, the heat exchange becomes worse, which leads to poor overall heat exchange effect, forming a heat exchange similar to that of a downstream heat exchanger. As the distance from the cold fluid inlet increases, the flow of the cold fluid becomes smaller and smaller. The present invention improves the grid distribution density so that the grid distribution density changes along the direction in which the cold fluid enters the fluid channel, so that the grid distribution density at the distance from the cold fluid inlet is the largest, the resistance is the largest, and the flow rate is reduced, resulting in a reduction in flow rate, so that as the distance from the cold fluid outlet increases, the flow rate increases, so that the heat exchange of the entire heat exchange area is balanced, forming a technical effect similar to countercurrent heat exchange, and improving the heat exchange efficiency as a whole.

[0048] As a preference, as the distance from the cold fluid inlet gets closer, the distribution density of the grid of the flow regulating device 4 increases. By changing the distribution density, the heat exchange effect can be better improved and the overall heat exchange can be more uniform.

[0049] As a preference, it further comprises a main pipeline, in which a thermal fluid is transported, and a plurality of thermal fluid inlet pipelines 1 are connected in parallel to the main pipeline for operation, and along the flow direction of the thermal fluid in the main pipeline, the angle between the thermal fluid flow regulating device 4 in the thermal fluid inlet pipeline 1 and the grid in the fluid flow regulating device 5 becomes larger and larger. Because the flow resistance becomes smaller and smaller as the grid angle becomes larger, it can ensure that the flow entering the thermal fluid inlet pipeline 1 along the flow direction of the thermal fluid in the main pipeline remains uniform, and avoid excessive flow in the upstream thermal fluid inlet pipeline 1 and excessive flow in the far end.

[0050] Preferably, along the flow direction of the hot fluid in the main pipeline, the angle between the hot fluid flow regulating device 4 in the hot fluid inlet pipeline and the grid in the fluid flow regulating device 5 increases continuously. By changing the amplitude, the flow distribution can be further ensured to be uniform.

[0051] Preferably, a plurality of thermal fluid inlet pipes 1 are connected in parallel to the main pipe for operation, and along the flow direction of the thermal fluid in the main pipe, the distribution density of the grids in the thermal fluid flow regulating device 4 and the fluid flow regulating device 5 in the thermal fluid inlet pipe is getting smaller and smaller. Because the flow resistance is getting smaller and smaller through the smaller distribution density of the grid, it can be ensured that the flow entering the thermal fluid inlet pipe 1 along the flow direction of the thermal fluid in the main pipe is kept uniform, avoiding excessive flow in the upstream thermal fluid inlet pipe 1 and too small flow at the far end.

[0052] Preferably, along the flow direction of the hot fluid in the main pipeline, the distribution density angle of the hot fluid flow regulating device 4 in the hot fluid inlet pipeline and the grid in the fluid flow regulating device 5 is gradually increased. By changing the amplitude, the uniform flow distribution can be further ensured.

[0053] A temperature sensor is provided on the hot fluid pipeline, and a thermometer is provided downstream of the flow regulating device 5 of the hot fluid inlet pipeline 1 to respectively detect the temperature of the hot fluid and the mixed fluid after heat exchange.

[0054] Preferably, a hot fluid flow meter is provided upstream of the flow regulating device 4 of the hot fluid inlet pipe 1 to measure the amount of hot fluid entering the hot fluid inlet pipe 1, and a cold fluid flow meter is provided on the cold fluid pipe to measure the flow of the cold fluid.

[0055] Preferably, when the measured thermal fluid flow rate is lower than a preset value, the controller controls the thermal fluid flow rate regulating device 4 to increase the opening, thereby increasing the amount of thermal fluid entering. When the detected thermal fluid flow rate is higher than a preset value, the controller controls the thermal fluid flow rate regulating device 4 to decrease the opening, thereby reducing the amount of thermal fluid entering.

[0056] Preferably, when the measured temperature of the hot fluid decreases, the controller controls the hot fluid flow regulating device 4 to increase the opening, thereby increasing the amount of hot fluid entering to meet the heat exchange requirement. When the detected temperature of the hot fluid increases, the controller controls the hot fluid flow regulating device 4 to decrease the opening, thereby reducing the amount of hot fluid entering. Through the above mediation, energy saving requirements can be achieved, heat waste can be avoided, and heat exchange requirements can be met in a timely manner.

[0057] Preferably, when the temperature of the fluid after heat exchange is detected to be lower than a preset value, the controller controls the cold fluid flow regulating device 5 to increase its opening, and the controller controls the hot fluid flow regulating device 4 to decrease its opening, thereby increasing the amount of hot fluid entering and reducing the amount of cold fluid. When the temperature of the hot fluid detected is higher than a preset value, the controller controls the cold fluid flow regulating device 5 to decrease its opening, and the hot fluid flow regulating device 4 to increase its opening, thereby reducing the amount of hot fluid entering and increasing the amount of cold fluid. The above mediation can achieve energy-saving requirements, avoid heat waste, and meet heat exchange requirements in a timely manner.

[0058] Preferably, when the temperature of the fluid after heat exchange is higher than the preset value, the controller controls the cold fluid flow regulating device 5 to increase the opening, thereby increasing the amount of cold fluid entering to meet the heat exchange requirement. When the temperature of the fluid after heat exchange is lower than the preset value, the controller controls the cold fluid flow regulating device 5 to decrease the opening, thereby reducing the amount of cold fluid entering to meet the heat exchange requirement. The above-mentioned adjustment can achieve energy saving requirements, avoid heat waste, and meet the heat exchange requirements in a timely manner.

[0059] The flow regulating device of the grid split structure adjusts the fluid flow by adjusting the angle between the grid and the central axis of the cold fluid inlet pipe.

[0060] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat exchanger for direct mixed heat exchange, comprising a hot fluid inlet pipe, a cold fluid inlet pipe and a heat exchange fluid outlet pipe, characterized in that: The cold fluid inlet pipe is arranged perpendicularly to the hot fluid inlet pipe and the heat exchange fluid outlet pipe. The cold fluid inlet pipe is arranged between the hot fluid inlet pipe and the heat exchange fluid outlet pipe. A flow regulating device is arranged in the hot fluid inlet pipe. The flow regulating device is a grid structure. The grid structure is provided with a plurality of grid sheets. The grid sheets are arranged perpendicular to the central axis direction of the cold fluid inlet pipe. Adjacent grid sheets have different inclination angles. As the distance from the cold fluid inlet pipe increases, the angle between the grid sheet and the cold fluid flow direction in the central axis direction of the cold fluid inlet pipe becomes larger and larger.

2. The direct mixed heat exchanger according to claim 1, characterized in that: As the distance from the cold fluid inlet pipe increases, the angle between the grid sheet and the cold fluid flow direction in the direction of the central axis of the cold fluid inlet pipe increases continuously.

3. The direct mixed heat exchanger according to claim 1, characterized in that: The heat exchange fluid outlet pipeline is provided with an outlet flow regulating device, which is a grid structure. The grid structure is provided with a plurality of grid plates, and the grid plates are arranged parallel to the central axis direction of the cold fluid inlet pipeline.

4. The direct mixed heat exchanger according to claim 3, characterized in that: A mixing device is arranged downstream of the outlet flow regulating device. The mixing device is a grid structure. The grid structure includes a plurality of grids. Adjacent grids are split regulating structures.

5. The direct mixed heat exchanger according to claim 3, characterized in that: A plurality of mixing devices are provided, and the mixing mechanism grid includes a parallel structure arranged parallel to the central axis direction of the cold fluid inlet pipeline and a vertical structure arranged perpendicular to the central axis direction of the cold fluid inlet pipeline, and the parallel structure and the vertical structure are arranged alternately.

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