A high-temperature generator, its control method, and a refrigerator

Abstract

The present invention provides a high-temperature generator, its control method and a refrigerator. The high-temperature generator is used for a double-effect absorption refrigerator. The high-temperature generator includes a cylinder body, a liquid distribution device, and a number of heat transfer tube groups. A heat source flows inside the heat transfer tube groups, and the heat source is steam or high-temperature water above 100 °C. The solution enters the cylinder body from the liquid distribution device, and the solution can be sprayed or dripped onto the outer walls of the heat transfer tube groups to evaporate and concentrate. With the above structure, the solution flowing into the high-temperature generator can be sprayed or dripped onto the outer walls of the heat transfer tube groups through the liquid distribution device, and a liquid film is formed on the outer walls of the heat transfer tube groups to carry out efficient heat exchange, evaporation and concentration. The overall evaporation and concentration efficiency is relatively high, and the energy-saving performance is good; moreover, the solution accumulated in the high-temperature generator is less, and the overall weight of the refrigerator is smaller, which is beneficial to the handling and operation of the refrigerator. Even in the event of an accident such as heat source leakage during shutdown, since the solution is less and the reflux is faster, crystallization is not likely to occur.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and particularly to a high-temperature generator, its control method, and a refrigerating machine. Background Art

[0002] A double-effect absorption refrigerating machine refers to a lithium bromide absorption refrigerating machine with two generation processes, which includes a high-temperature generator, a low-temperature generator, an absorber, a condenser, an evaporator, and the pipeline structure between each component. It mainly generates refrigerant vapor by evaporating and concentrating the lithium bromide solution in the high-temperature generator and the low-temperature generator. When the refrigerant vapor flows into the low-temperature generator, it further concentrates the lithium bromide solution, generating more refrigerant vapor. Then the refrigerant vapor enters the vacuum condenser for condensation, and finally evaporates at a low temperature in the vacuum evaporator and is absorbed by the concentrated lithium bromide solution. When the refrigerant vapor evaporates at a low temperature, it absorbs heat, cooling the chilled water in contact with it, and obtaining chilled water with a lower temperature as the refrigeration medium.

[0003] In the prior art, for a double-effect absorption refrigerating machine using steam or high-temperature water as the heat source, its high-temperature generator usually adopts a flooded generator, that is, the heat source is inside the heat transfer tube, and the lithium bromide solution inside the flooded generator submerges the heat transfer tube for heat exchange. Due to the influence of the static liquid column of the solution in the flooded generator, the heat transfer efficiency of the heat transfer tube is limited. It is necessary to heat all the solution to the generation temperature before refrigerant can be produced, resulting in a longer start-up time of the refrigerating machine and poor energy-saving performance. Since there is a large amount of solution accumulated inside the flooded generator, the overall weight of the refrigerating machine is relatively large, which is not conducive to the handling and operation of the refrigerating machine. Moreover, in the shutdown state, if a heat source leakage occurs, a large amount of solution in the flooded generator will crystallize, causing damage to the high-temperature generator.

[0004] Therefore, how to provide a double-effect absorption refrigerating machine using steam or high-temperature water as the heat source, with higher heat transfer efficiency, better energy-saving performance, and less accumulated solution inside, is a technical problem that those skilled in the art urgently need to solve. Summary of the Invention

[0005] The object of the present invention is to provide a double-effect absorption refrigerating machine using steam or high-temperature water as the heat source, with higher heat transfer efficiency, better energy-saving performance, and less accumulated solution inside

[0006] To solve the above technical problems, the present invention provides a high-temperature generator for a double-effect absorption refrigerating machine. The high-temperature generator includes a cylinder body and a liquid distribution device and a plurality of heat transfer tube groups arranged inside the cylinder body. A heat source flows inside the heat transfer tube groups, and the heat source is steam or high-temperature water above 100°C. The solution can enter the cylinder body from the liquid distribution device, and at least part of the solution can be sprayed or dripped onto the outer walls of the heat transfer tube groups to evaporate and concentrate. The refrigerant evaporated can be output from a refrigerant outlet provided on the cylinder body, and the concentrated solution can be output from a solution outlet provided on the cylinder body.

[0007] With the above structure, at least part of the solution flowing into the high-temperature generator can be sprayed or dripped onto the outer walls of the heat transfer tube groups through the liquid distribution device, and a liquid film can be formed on the outer walls of the heat transfer tube groups to perform efficient heat exchange, evaporation and concentration. The overall evaporation and concentration efficiency is relatively high, and the energy-saving performance is good; and there is less solution accumulated in the high-temperature generator, and the overall weight of the refrigerating machine is relatively small, which is beneficial to the handling and operation of the refrigerating machine. Even in the event of an accident such as heat source leakage during shutdown, since there is less solution and the reflux is faster, crystallization is not likely to occur.

[0008] Optionally, the solution can enter the liquid distribution device through a liquid inlet pipeline, and the liquid distribution device is provided with at least three liquid outlet ports.

[0009] Optionally, the heat source is steam, and the heat source flows in from above and out from below each heat transfer tube group; or, the heat source is high-temperature water above 100°C, and the heat source flows in from below and out from above each heat transfer tube group.

[0010] Optionally, the inside of the cylinder body is divided into a spraying area provided in the upper part and a full-liquid area provided in the lower part. The heat transfer tube groups are provided in both the spraying area and the full-liquid area, and the solution can submerge the heat transfer tube groups in the full-liquid area.

[0011] Optionally, a partition is provided between the spraying area and the full-liquid area. There is a notch between the partition and the cylinder body, and the notch is provided on the side away from the solution outlet. The solution passing through the spraying area can be concentrated by the partition and then flow into the full-liquid area through the notch.

[0012] Optionally, the width of the heat transfer tube group provided in the full-liquid area is smaller than the width of the heat transfer tube group provided in the spraying area, and the bottom plate of the cylinder body is inclined.

[0013] Optionally, it further includes a detection component and a control component. The detection component can respectively detect the saturation temperature of the solution in the liquid distribution device and the saturation temperature inside the cylinder body, and the control component can control the flow rate of the solution flowing into the cylinder body.

[0014] Optionally, it further includes a detection component and a control component. The detection component can detect the concentration and temperature of the solution at several positions inside the cylinder, and the control component can control the flow rate of the heat source flowing into the heat transfer tube group.

[0015] The present invention also provides a control method for a high-temperature generator. Based on the high-temperature generator described above, the detection component respectively detects the saturation temperature of the solution in the liquid inlet pipeline and the saturation temperature inside the cylinder. The control component calculates the difference or ratio between the two. When the difference or ratio is not less than the first preset value, the control component increases the flow rate of the solution flowing into the cylinder until the difference or ratio is less than the first preset value.

[0016] The present invention also provides a control method for a high-temperature generator. Based on the high-temperature generator described above, the detection component detects the concentration and temperature of the solution at several positions inside the cylinder. If the concentration and temperature of the solution at any position are not less than the second preset value, the control component reduces the flow rate of the heat source flowing into the heat transfer tube group until the concentration and temperature of the solution at each position are lower than the second preset value; the third preset value is greater than the second preset value. If, after the control component reduces the flow rate of the heat source flowing into the heat transfer tube group, the concentration and temperature of the solution at any position are not less than the third preset value, then the control component cuts off the heat source.

[0017] The present invention also provides a refrigerator, including a high-temperature generator, a low-temperature generator, an absorber, a condenser, an evaporator, and the pipeline structure between each component. The high-temperature generator is the high-temperature generator described above. Description of the Drawings

[0018] Figure 1 is the front cross-sectional schematic view of the first embodiment of the high-temperature generator provided by the present invention;

[0019] Figure 2 is Figure 1 the side cross-sectional schematic view of the high-temperature generator in

[0020] Figure 3 is the front cross-sectional schematic view of the second embodiment of the high-temperature generator provided by the present invention;

[0021] Figure 4 is Figure 3 the side cross-sectional schematic view of the high-temperature generator in

[0022] Figure 5 is the front cross-sectional schematic view of the third embodiment of the high-temperature generator provided by the present invention;

[0023] Figure 6 is Figure 5 the side cross-sectional schematic view of the high-temperature generator in

[0024] Figure 7 It is a front elevation sectional view of the fourth embodiment of the high-temperature generator provided by the present invention;

[0025] Figure 8 is Figure 7 a side elevation sectional view of the high-temperature generator in

[0026] Figure 9 It is a front elevation sectional view of the fifth embodiment of the high-temperature generator provided by the present invention;

[0027] Figure 10 is Figure 9 a side elevation sectional view of the high-temperature generator in

[0028] Figure 11 It is a front elevation sectional view of the sixth embodiment of the high-temperature generator provided by the present invention;

[0029] Figure 12 is Figure 11 a side elevation sectional view of the high-temperature generator in

[0030] Figure 13 It is a schematic diagram of the inflow and outflow of the solution when the high-temperature generator provided by the present invention is in operation;

[0031] Figure 14 It is a schematic diagram of the inflow and outflow of the heat source when the high-temperature generator provided by the present invention is in operation.

[0032] Figures 1-14 The descriptions of the reference numerals in

[0033] are as follows: 1 cylinder body, 2 liquid distribution device, 3 heat transfer tube bundle, 4 refrigerant outlet, 5 solution outlet, 6 liquid inlet pipeline, 7 partition board, 8 heat source inlet, 9 heat source outlet, 10 solution regulating valve, 11 solution pump, 12 heat source regulating valve. Detailed Embodiments

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The embodiment of the present invention provides a high-temperature generator for a double-effect absorption refrigerating machine. Please refer to Figures 1-12 , the high-temperature generator includes a cylinder body 1 and a liquid distribution device 2 and a plurality of heat transfer tube bundles 3 arranged inside the cylinder body 1. A heat source flows inside the heat transfer tube bundles 3, and the heat source is steam or high-temperature water above 100 °C. The solution can enter the cylinder body 1 from the liquid distribution device 2, and at least part of the solution can be sprayed or dripped onto the outer wall of the heat transfer tube bundles 3 to evaporate and concentrate. The evaporated refrigerant can be output from the refrigerant outlet 4 provided on the cylinder body 1, and the concentrated solution can be output from the solution outlet 5 provided on the cylinder body 1.

[0036] With the above structure, at least part of the solution flowing into the high-temperature generator can be sprayed or dripped onto the outer wall of the heat transfer tube bundle 3 through the liquid distribution device 2, and a liquid film is formed on the outer wall of the heat transfer tube bundle 3 to perform efficient heat exchange and evaporation concentration. The overall evaporation concentration efficiency is relatively high, and the energy-saving performance is good; and the solution accumulated in the high-temperature generator is less, the overall weight of the refrigerator is smaller, which is conducive to the handling and operation of the refrigerator. Even in the event of an accident such as heat source leakage during shutdown, since the solution is less and the reflux is faster, crystallization is not likely to occur; due to the high heat transfer efficiency of spraying or dripping and the absence of the influence of the static liquid column, the volume of the heat transfer tube bundle 3 can be reduced, or it can be designed as a narrow and tall structure with a smaller floor area, so that the volume of the high-temperature generator is reduced, the floor area is reduced, the operating weight is reduced, and the cost is reduced; when starting the high-temperature generator, there is no need to fill the solution, so the start-up time of the high-temperature generator is faster.

[0037] Please refer to Figures 1-12 , in this embodiment, the cylinder body 1 is the outer shell of the high-temperature generator; the liquid distribution device 2 is a liquid expansion device arranged at the top of the cylinder body 1 and evenly provided with a number of spray nozzles or drip nozzles, which can at least evenly spray or drip part of the solution flowing into the cylinder body 1 onto the heat transfer tube bundle 3, so that this part of the solution can perform efficient heat exchange and evaporation concentration with the heat transfer tube bundle 3; the heat transfer tube bundle 3 is arranged inside the cylinder body 1 and below the liquid distribution device 2, and a heat source flows inside it to provide heat for the inside of the cylinder body 1 and the solution to be evaporated and concentrated.

[0038] The solution can enter the liquid distribution device 2 through the liquid inlet pipeline 6, drip to the bottom of the cylinder body 1 after spraying or dripping and evaporation concentration, and finally flow out of the cylinder body 1 through the solution outlet 5. The refrigerant generated by the evaporation of the solution flows out of the cylinder body 1 through the refrigerant outlet 4 arranged on the side wall of the cylinder body 1, completing the concentration of the solution and the separation of the refrigerant.

[0039] Since the solution is redistributed by the liquid distribution device 2 and then enters the cylinder body 1, the liquid inlet pipeline 6 can be arranged on any side of the liquid distribution device 2, so that the solution enters from any side of the liquid distribution device 2 without affecting the heat exchange effect of the solution in the cylinder body 1. The setting of the liquid inlet pipeline 6 is more flexible, and the assembly of the high-temperature generator is more convenient.

[0040] In this embodiment, the liquid distribution device 2 is provided with at least three liquid outlets, and the liquid outlet is a spray nozzle or a drip nozzle arranged below the liquid distribution device 2. The solution in the liquid distribution device 2 can enter the cylinder body 1 in a spraying or dripping manner through the spray nozzle or the drip nozzle. This setting method can ensure that the solution entering the cylinder body 1 is evenly sprayed or dripped onto the outer wall of the heat transfer tube bundle 3, so that at least part of the solution can cover the outer wall of the heat transfer tube bundle 3 to form a liquid film for heat exchange.

[0041] It can be understood that the specific structures and shapes of the cylinder body 1, the liquid distribution device 2, and the heat transfer tube group 3 can be set according to the actual situation. The installation positions of the refrigerant outlet 4, the solution outlet 5, the liquid inlet pipeline 6, and the liquid outlet can also be set according to the actual situation. The present invention does not limit this, as long as each component can achieve the technical effects described above.

[0042] In this embodiment, when the heat source is steam, the heat source flows in from above and out from below of each heat transfer tube group 3. Please refer to Figure 1 , Figure 4 , Figure 9 and Figure 11 . The arrow directions of the heat source inlet 8 and the heat source outlet 9 in the figure are the flowing directions of the heat source. Since steam is a gaseous heat source and it will condense during heat exchange, the above-mentioned flowing direction can make better use of the heat source and prevent the heat source from flowing back. As shown in Figure 9 and Figure 11 , since the heat transfer tube group 3 in the cylinder body 1 is divided into two parts, the heat source can also flow in from above or below of the two heat transfer tube groups 3 simultaneously and flow out from below or above simultaneously;

[0043] In this embodiment, when the heat source is high-temperature water above 100 °C, the heat source flows in from below and out from above of each heat transfer tube group 3. Please refer to Figure 6 and Figure 8 . The arrow directions of the heat source inlet 8 and the heat source outlet 9 in the figure are the flowing directions of the heat source. Since high-temperature water is a liquid heat source, the flowing mode from bottom to top has higher heat utilization efficiency, and the lower the heat source temperature, the higher the solution concentration. This mode can better adapt to the evaporation and concentration of the solution. Of course, when the heat source is high-temperature water above 100 °C, it can also flow in from above and out from below of each heat transfer tube group 3, or flow in from above or below of the two heat transfer tube groups 3 simultaneously as described above and flow out from below or above simultaneously.

[0044] In this embodiment, the inside of the cylinder body 1 is divided into a spray area arranged in the upper part and a full liquid area arranged in the lower part. The spray area and the full liquid area are both provided with the heat transfer tube group 3, and the solution can submerge the heat transfer tube group 3 in the full liquid area; a partition plate 7 is arranged between the spray area and the full liquid area, and there is a notch between the partition plate 7 and the cylinder body 1. The notch is arranged on the side far from the solution outlet 5. The solution passing through the spray area can be concentrated by the partition plate 7 and then flow into the full liquid area through the notch.

[0045] Since the heat exchange method of spraying or dripping the solution onto the heat transfer tube group 3 to form a liquid film has high efficiency, if the height of the heat transfer tube group 3 is relatively high, it is easy to cause excessive evaporation of the solution during the downward flow process, and the solute in the solution crystallizes on the tube wall of the heat transfer tube group 3, affecting the service life of the high-temperature generator.

[0046] Please refer to Figure 5 andFigure 6 , in this embodiment, the inside of the cylinder body 1 is divided into a spray zone arranged at the upper part and a full-liquid zone arranged at the lower part. The solution exchanges heat with the heat transfer tube group 3 in a spray or drip manner in the spray zone, and exchanges heat with the heat transfer tube group 3 in an immersion manner after flowing into the full-liquid zone, which can effectively prevent the solution from crystallizing. In this embodiment, high-temperature water is used as the heat source. The heat transfer tube groups 3 in the spray zone and the full-liquid zone are interconnected. The heat source flows in from the heat transfer tube group 3 arranged in the full-liquid zone and flows out from the heat transfer tube group 3 arranged in the spray zone. Before the solution flows from the spray zone into the full-liquid zone, it is concentrated by the partition plate 7 first and then flows into the full-liquid zone through the notch. The flow direction of the solution is from the notch to the solution outlet 5, which is completely opposite to the flow direction of the heat source, and can realize the complete countercurrent heat exchange between the solution and the heat source, and the utilization rate of the heat source is relatively high.

[0047] Please refer to Figure 7 and Figure 8 , in this embodiment, the setting forms of the spray zone and the full-liquid zone are the same as those in Figure 5 and Figure 6 , and the setting method of the heat source is also the same, so it will not be elaborated here. In this embodiment, the width of the heat transfer tube group 3 arranged in the full-liquid zone is smaller than the width of the heat transfer tube group 3 arranged in the spray zone, and the bottom plate of the cylinder body 1 is inclined. Among them, the width of the heat transfer tube group 3 refers to the size of the heat transfer tube group 3 in the left-right direction in Figure 8 . This setting method can greatly reduce the accumulated amount of the solution in the full-liquid zone, thereby greatly reducing the required solution filling amount. When the high-temperature generator stops running, the solution can return to the absorber relatively quickly, reducing the probability of the solution in the full-liquid zone crystallizing due to the damage of the heat transfer tube group 3.

[0048] Please refer to Figure 9 and Figure 10 , in this embodiment, steam is used as the heat source, and the heat transfer tube groups 3 in the spray zone and the full-liquid zone are not interconnected, that is, the heat transfer tube groups 3 in the spray zone and the full-liquid zone each have a heat source inlet 8 and a heat source outlet 9. The solution exchanges heat using different heat sources in the spray zone and the full-liquid zone respectively, and the heat exchange efficiency is higher.

[0049] Please refer to Figure 11 and Figure 12 , compared with the embodiments in Figure 9 and Figure 10 , the difference in this embodiment is only that the width of the heat transfer tube group 3 arranged in the full-liquid zone is smaller than the width of the heat transfer tube group 3 arranged in the spray zone, and the bottom plate of the cylinder body 1 is inclined. Its effect is also the same as that of the embodiments in Figure 7 and Figure 8 , so it will not be elaborated here.

[0050] In addition, the cylinder body 1 can also be divided into upper and lower two zones, and both zones are spray zones. Please refer to Figure 3 and Figure 4 , this embodiment is the same as Figure 1and Figure 2 It is similar to the non-zoned implementation manner, only the setting form of the heat transfer tube group 3 is different, which will not be elaborated here.

[0051] It can be understood that based on the internal zoning manner of the cylinder body 1 described above, as well as the type and flow direction of the heat source, free combinations can be made in practical applications. As long as any one of several combination methods is adopted, it should be included in the protection scope of the present invention.

[0052] This embodiment further includes a detection component and a control component. The detection component can respectively detect the saturation temperature of the solution in the liquid inlet pipeline 6 and the saturation temperature in the cylinder body 1, and can also detect the concentration and temperature of the solution at several positions in the cylinder body 1; the control component can control the flow rate of the solution flowing into the cylinder body 1 and the flow rate of the heat source flowing into the heat transfer tube group 3.

[0053] The control component judges each value detected by the detection component, compares it with the preset value respectively, and controls the flow rate of the solution and the flow rate of the heat source according to the comparison result to prevent the solution from crystallizing inside the cylinder body 1.

[0054] The present invention also provides a control method for a high-temperature generator. Based on the high-temperature generator described above, it is as follows:

[0055] The detection component respectively detects the saturation temperature of the solution in the liquid inlet pipeline 6 and the saturation temperature in the cylinder body 1. The control component calculates the difference or ratio between the two. When the difference or ratio is not less than the first preset value, the control component increases the flow rate of the solution flowing into the cylinder body 1 until the difference or ratio is less than the first preset value.

[0056] The detection component detects the concentration and temperature of the solution at several positions in the cylinder body 1. If the concentration of the solution and temperature at any position is not less than the second preset value, the control component reduces the flow rate of the heat source flowing into the heat transfer tube group 3 until the concentration of the solution at each position is lower than the second preset value;

[0057] The third preset value is greater than the second preset value. If the concentration of the solution at any position is not less than the third preset value after the control component reduces the flow rate of the heat source flowing into the heat transfer tube group 3, the control component cuts off the heat source.

[0058] Among them, the first preset value, the second preset value, and the third preset value should all be calculated according to the parameters of the high-temperature generator in practical applications.

[0059] Since the temperature, pressure, etc. inside the cylinder body 1 are different, the saturation temperature of the solution will also be different. If the saturation temperature difference between the inside and outside of the cylinder body 1 is too large, it may cause the solution to directly evaporate before entering the cylinder body 1, forming a flashing phenomenon, resulting in air resistance in the liquid inlet pipeline 6, affecting the liquid inlet volume of the solution entering the cylinder body 1, and even damaging the liquid inlet pipeline 6 and the liquid distribution device 2.

[0060] The first preset value described above refers to the critical value of the difference or ratio of the saturation temperatures inside and outside the cylinder body 1 that can form the flashing phenomenon. That is, if the difference or ratio of the saturation temperatures inside and outside the cylinder body 1 is greater than the first preset value, a flashing phenomenon will occur in the liquid inlet pipeline 6; if the difference or ratio of the saturation temperatures inside and outside the cylinder body 1 is less than the first preset value, no flashing phenomenon will occur.

[0061] Therefore, when the difference or ratio of the saturation temperature of the solution in the liquid inlet pipeline 6 and the saturation temperature inside the cylinder body 1 is greater than the first preset value, the control component will increase the flow rate of the solution flowing into the cylinder body 1 to reduce the overall saturation temperature of the solution in the liquid inlet pipeline 6, that is, reduce the saturation temperature of the solution entering the cylinder body 1, and then reduce the above difference or ratio until the difference or ratio is less than the first preset value, which can effectively prevent the liquid inlet pipeline 6 and the liquid distribution device 2 from being damaged and increase the service life of the high-temperature generator.

[0062] It should be noted that when the difference or ratio of the saturation temperature of the solution in the liquid inlet pipeline 6 and the saturation temperature inside the cylinder body 1 is greater than the first preset value, the purpose of the control component to increase the flow rate of the solution flowing into the cylinder body 1 is not only to increase the flow rate of the solution, but to reduce the temperature of the solution by increasing the flow rate to reduce the saturation temperature of the solution in the liquid inlet pipeline 6.

[0063] The second preset value represents the critical concentration value at which crystallization may occur when the solution evaporates and concentrates in the cylinder body 1; when the concentration and temperature of the solution at several positions inside the cylinder body 1 are higher than the second preset value, the concentration and temperature of some solutions are too high and crystallization will occur, resulting in a reduction in the service life of the high-temperature generator. At this time, the control component will reduce the flow rate of the heat source flowing into each heat transfer tube group 3 to reduce the heat exchange temperature and efficiency inside the cylinder body 1, and then reduce the temperature inside the cylinder body 1, reduce the concentration value and temperature value of the above-mentioned solutions with too high concentration and temperature, effectively prevent the solution from crystallizing inside the cylinder body 1, and increase the service life of the high-temperature generator.

[0064] The third preset value is greater than the second preset value. After the control component has reduced the flow rate of the heat source, if the concentration value or temperature value of some solutions inside the cylinder body 1 is greater than the third preset value, it means that the concentration and temperature of some solutions are still gradually increasing, and there may be a fault inside the high-temperature generator. The control component can completely cut off the heat source to prevent further damage to the high-temperature generator.

[0065] It can be understood that the first preset value, the second preset value, and the third preset value can be values lower than their own limit values described above to leave a certain buffer for the control component to adjust the flow rates of the solution and the heat source.

[0066] Please refer to Figure 13 and Figure 14, in this embodiment, the control component controls the flow rate of the solution by adjusting the opening degree of the solution regulating valve 10 and the power of the solution pump 11, and controls the flow rate of the heat source by adjusting the opening degree of the heat source regulating valve 12. Of course, in practical applications, the control component can also control the flow rates of the solution and the heat source in other ways, and the present invention does not limit this.

[0067] The present invention also provides a refrigerating machine, which includes a high-temperature generator, a low-temperature generator, an absorber, a condenser, an evaporator, and the pipeline structure between each component. The high-temperature generator is the high-temperature generator described above. Since the high-temperature generator already has the above technical effects, the refrigerating machine including this high-temperature generator should also have the same technical effects, so it will not be elaborated here.

[0068] The refrigerating machine of this embodiment is a double-effect absorption refrigerating machine. The high-temperature generator described above serves as the double-effect high-temperature generator inside the refrigerating machine. After the solution in it is evaporated and concentrated by the heat source, the evaporated refrigerant can be used as the heat source for other components such as other generators for multiple uses.

[0069] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A control method for a high-temperature generator, where the high-temperature generator is used in a double-effect absorption refrigerating machine, characterized in that, the high-temperature generator includes a cylinder body (1), a liquid distribution device (2) and a number of heat transfer tube groups (3) arranged in the cylinder body (1). A heat source flows inside the heat transfer tube groups (3), and the heat source is steam or high-temperature water above 100°C. The solution can enter the cylinder body (1) from the liquid distribution device (2), and at least part of the solution can be sprayed or dripped onto the outer wall of the heat transfer tube groups (3) for evaporation and concentration. The refrigerant evaporated can be output from a refrigerant outlet (4) provided on the cylinder body (1), and the concentrated solution can be output from a solution outlet (5) provided on the cylinder body (1); the high-temperature generator includes a detection component and a control component; the control method includes: The detection component respectively detects the saturation temperature of the solution in the liquid inlet pipeline (6) and the saturation temperature inside the cylinder body (1). The control component calculates the difference or ratio between the two. When the difference or ratio is not less than a first preset value, the control component increases the flow rate of the solution flowing into the cylinder body (1) until the difference or ratio is less than the first preset value; the first preset value refers to the critical value of the difference or ratio of the saturation temperatures inside and outside the cylinder body 1 that can form a flashing phenomenon; The detection component detects the concentration and temperature of the solution at several positions inside the cylinder body (1). If the concentration and temperature of the solution at any position are not less than a second preset value, the control component reduces the flow rate of the heat source flowing into the heat transfer tube groups (3) until the concentration and temperature of the solution at each position are lower than the second preset value; the second preset value represents the critical concentration value at which crystallization may occur when the solution evaporates and concentrates inside the cylinder. A third preset value is greater than the second preset value. If, after the control component reduces the flow rate of the heat source flowing into the heat transfer tube groups (3), the concentration and temperature of the solution at any position are not less than the third preset value, the control component cuts off the heat source.

2. The control method for a high-temperature generator according to claim 1, characterized in that: The inside of the cylinder body (1) is divided into a spray area provided in the upper part and a full liquid area provided in the lower part. The spray area and the full liquid area are both provided with the heat transfer tube groups (3), and the solution can submerge the heat transfer tube groups (3) in the full liquid area.

3. The control method for a high-temperature generator according to claim 2, characterized in that: A partition plate (7) is arranged between the spray area and the full liquid area. There is a gap between the partition plate (7) and the cylinder body (1), and the gap is arranged on the side away from the solution outlet (5). The solution passing through the spray area can be concentrated by the partition plate (7) and then flow into the full liquid area through the gap.

4. The control method for a high-temperature generator according to claim 1, characterized in that: The solution can enter the liquid distribution device (2) through the liquid inlet pipeline (6), and the liquid distribution device (2) is provided with at least three liquid outlets.

5. The control method for a high-temperature generator according to claim 1, characterized in that: The heat source is steam, and the heat source flows in from above and out from below of each heat transfer tube group (3); or, the heat source is high-temperature water above 100°C, and the heat source flows in from below and out from above of each heat transfer tube group (3).

6. The control method of the high-temperature generator according to any one of claims 2 to 3, characterized in that: The width of the heat transfer tube group (3) arranged in the full liquid area is smaller than the width of the heat transfer tube group (3) arranged in the spraying area, and the bottom plate of the cylinder body (1) is inclined.

7. The control method of the high-temperature generator according to any one of claims 1-3, characterized in that: The detection component can respectively detect the saturation temperature of the solution in the liquid distribution device (2) and the saturation temperature in the cylinder body (1), and the control component can control the flow rate of the solution flowing into the cylinder body (1).

8. The control method of the high-temperature generator according to any one of claims 1-3, characterized in that: The detection component can detect the concentration and temperature of the solution at several positions in the cylinder body (1), and the control component can control the flow rate of the heat source flowing into the heat transfer tube group (3).

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