Steam condensing device and control method thereof

Abstract

The invention provides a condensing device and a control method thereof. A heat exchange assembly is contained in a shell; the heat exchange assembly comprises a dry-type module and a wet-type module, the dry-type module and the wet-type module are arranged in parallel, dead steam is introduced into the dry-type module and the wet-type module at the same time, and the condensation amount on the two sides is automatically distributed according to the thermal resistance of the dry-type module and the wet-type module; the packing part is arranged on one side of the wet type module and is used for receiving spraying water dripping from the wet type module; the condensate water tank is arranged on one side of the dry type module and used for containing condensate water, and at the moment, the dry type module and the wet type module conduct parallel condensation on dead steam, so that the condensation amount is fully distributed, a plurality of heat exchange areas are increased, and the water-saving and electricity-saving effects are integrated. Meanwhile, in the control method of the condensing device, the water-saving mode and the power-saving mode represent water saving and power saving as much as possible respectively, so that the required balance between the spraying amount and the fan operation power consumption is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of condensing devices, and in particular to a condensing device and a control method thereof. Background Art

[0002] With the development of science and technology, condensing devices are used in people's lives. The condensing device is used to condense exhaust steam and output corresponding condensed water. In the existing technology, the condensing device includes a shell and a heat exchanger. The external gas dissipates heat to the heat exchanger and triggers the heat exchanger to condense the exhaust steam, thereby outputting the corresponding condensed water. However, a single heat exchanger cannot fully condense the exhaust steam, affecting the water-saving and power-saving effects of the condensing device. Summary of the Invention

[0003] The object of the present invention is to provide a condensing device and a control method thereof, wherein a dry module and a wet module condense exhaust steam in parallel, thereby fully distributing the condensation amount and increasing multiple heat exchange areas to integrate water-saving and power-saving effects to solve the above-mentioned technical problems.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: a condensing device, comprising:

[0005] case;

[0006] a heat exchange assembly housed in the housing; the heat exchange assembly includes a dry module and a wet module, the dry module and the wet module being arranged in parallel, exhaust steam passing through the dry module and the wet module simultaneously, and the condensation amount on both sides is automatically distributed according to the thermal resistance of the dry module and the wet module;

[0007] a filler portion, disposed on one side of the wet module, and configured to receive spray water dripping from the wet module;

[0008] A condensed water tank is provided on one side of the dry module and is used for containing condensed water.

[0009] Optionally, the dry module is a finned radiator, and external air passes through the finned radiator and takes away the heat output by the finned radiator;

[0010] The wet module is a pockmarked heat exchange tube that uses the evaporation of water combined with the flow of air to remove heat to achieve condensation.

[0011] Optionally, after the exhaust steam enters, it flows in parallel to the dry module and the wet module, and the exhaust steam flow is automatically distributed according to the different thermal resistances on both sides. At this time, when the temperature is low, the dry module has a faster condensation rate due to its large heat exchange area and low temperature, and the local condensation pressure is slightly low. The exhaust steam automatically flows more to the dry module until the condensation pressure is balanced. At this time, the dry module bears a higher load;

[0012] On the contrary, when the temperature is high, the condensation rate of the dry module decreases and the local condensation pressure is slightly higher. At this time, the exhaust steam automatically flows more to the wet module.

[0013] Optionally, after the exhaust steam is condensed, condensed water is generated and flows downward. The condensed water of the dry module and the wet module flows to the condensed water tank and is pumped away from the condensed water outlet using a condensed water pump. At this time, a vacuum pump is used to pump away the trace non-condensable gas in the exhaust steam from the non-condensable gas outlet.

[0014] Optionally, the condensing device also includes a spray pump, which is arranged on the outside of the shell. The spray pump draws water from the spray water outlet and sends it to the spray water inlet. The water enters the shell and is distributed using a nozzle to spray the water onto the outer surface of the heat exchange tube of the wet module to keep the wet module moist and maintain surface evaporation.

[0015] Optionally, after the spray water falls from the outer surface of the heat exchange tube, its temperature rises to a certain extent due to the influence of the temperature of the heat exchange tube, and then drips onto the packing part. The surface of the packing part is moistened and evaporated, thereby reducing the temperature of the spray water to room temperature. The cooled spray water drips onto the tray for standby use;

[0016] After long-term use, the spray water becomes concentrated and dirty, and is discharged through the drain port. Fresh water is continuously added through the water replenishment port to make up for the water lost due to evaporation and drainage, and maintain the water level in the tray.

[0017] Optionally, the condensing device further includes a fan, which is used to output air, and the air flows through the dry module, the filler part, and the wet module in parallel.

[0018] In one embodiment of the present application, a control method for a condensing device is applied to the above-mentioned condensing device; the control method for the condensing device includes:

[0019] Collect the set negative pressure and the actual measured negative pressure, and compare the set negative pressure and the actual measured negative pressure;

[0020] The absolute values ​​of the set negative pressure and the actual measured negative pressure are input into the PID controller, wherein the absolute value of the set negative pressure is input into the positive end, and the absolute value of the actual measured negative pressure is input into the negative end as the feedback value; when the absolute value of the actual measured negative pressure is too small, the output control quantity develops in the direction of increase.

[0021] Optionally, collect control error, control error: e = set negative pressure absolute value - actual measured negative pressure absolute value;

[0022] Control volume And take smoothing filter;

[0023] The three coefficients are P, I, and D control coefficients respectively; the control amount is limited and sorted into numbers between 0 and 10000; 0 represents no output at all, and 10000 represents maximum output;

[0024] The corresponding water-saving mode or electricity-saving mode is triggered according to the water consumption parameters or electricity consumption parameters of the region.

[0025] Optionally, in water-saving mode, the fan and sprinkler pump speeds are determined as follows:

[0026] The fan speed command = u / 0.75 and is limited to [0,10000]. That is, when the control variable u ≥ 7500, the fan reaches its maximum speed. The spray pump speed command = 4(u-7500) and is limited to [0,10000]. That is, water spraying will only start when u > 7500. The above control method ensures that if the vacuum is insufficient, the fan speed is prioritized to the maximum, and water spraying is minimized, thus reducing water consumption. If the vacuum is still insufficient after the fan speed reaches the maximum, water spraying will be resumed, relying on water evaporation to achieve the remaining cooling power, thus achieving maximum water conservation.

[0027] In power saving mode, the speed of the fan and sprinkler pump is determined as follows:

[0028] The minimum fan speed command is maintained at 2000, meaning the fan must operate at a minimum speed of 20%. The subsequent fan speed command is set to u, increasing and decreasing synchronously with the control variable, with a limit of [2000, 10000]. The spray pump speed command is set to 2(u-5000) and limited to [0, 10000]. This means water spraying begins when the control command exceeds 5000 and increases and decreases synchronously with the control variable. This control method prevents water spraying when cooling demand is low, but initiates spraying promptly when the control variable reaches a certain level, relying on water evaporation to achieve cooling, minimizing fan speed and power consumption. Since water spraying only occurs when the fan speed reaches a certain level, the dry module's maximum heat dissipation capacity is still utilized, resulting in water savings.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a condensing device and a control method thereof, wherein a heat exchange component is housed in a housing; the heat exchange component includes a dry module and a wet module, the dry module and the wet module being arranged in parallel, exhaust steam being simultaneously passed into the dry module and the wet module, and the condensation amount on both sides being automatically distributed according to the thermal resistance of the dry module and the wet module; a packing portion is provided on one side of the wet module, the packing portion being used to receive spray water dripping from the wet module; a condensation water tank is provided on one side of the dry module, the condensation water tank being used to hold condensation water, at which time the dry module and the wet module condense the exhaust steam in parallel, thereby fully distributing the condensation amount and increasing multiple heat exchange areas to achieve integrated water-saving and power-saving effects. At the same time, in the control method of the condensing device, the water-saving mode and the power-saving mode represent maximizing water-saving and power-saving, respectively, so as to achieve the desired balance between the spraying amount and the power consumption of the fan operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0032] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0033] Figure 1 A schematic diagram of a condensing device according to an embodiment of the present application is shown.

[0034] Reference numerals

[0035] 100. Steam condensing device;

[0036] 10. Housing;

[0037] 20. Heat exchange component; 21. Dry module; 22. Wet module;

[0038] 30. Filling part;

[0039] 40. Condensate tank;

[0040] 50. Spray pump;

[0041] 60. Fan. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0043] Please refer to the attached Figure 1 , an embodiment of the present application provides a condensing device 100, which is used to condense exhaust steam and output corresponding condensed water.

[0044] Please refer to the attached Figure 1 In the embodiment of the present application, the condensing device 100 includes a shell 10, a heat exchange component 20, a packing part 30 and a condensed water tank 40; the heat exchange component 20 is accommodated in the shell 10; the heat exchange component 20 includes a dry module 21 and a wet module 22, and the dry module 21 and the wet module 22 are arranged in parallel. The exhaust steam passes into the dry module 21 and the wet module 22 at the same time, and the condensation amount on both sides is automatically distributed according to the thermal resistance of the dry module 21 and the wet module 22; the packing part 30 is arranged on one side of the wet module 22, and the packing part 30 is used to receive the spray water dripping from the wet module 22; the condensed water tank 40 is arranged on one side of the dry module 21, and the condensed water tank 40 is used to hold condensed water. At this time, the dry module 21 and the wet module 22 condense the exhaust steam in parallel, so as to fully distribute the condensation amount and increase multiple heat exchange areas to integrate water saving and power saving effects. Meanwhile, in the control method of the condensing device 100 , the water-saving mode and the power-saving mode respectively represent saving water and power as much as possible, so as to achieve the required balance between the spraying amount and the power consumption of the fan 60 .

[0045] Please refer to the attached Figure 1 In the embodiment of the present application, the shell 10 serves as a supporting component of the condensing device 100 , and the shell 10 is used to support the heat exchange component 20 , the filler part 30 and the condensed water tank 40 .

[0046] The heat exchange assembly 20 is accommodated in the shell 10; the heat exchange assembly 20 includes a dry module 21 and a wet module 22. The dry module 21 and the wet module 22 are arranged in parallel. The exhaust steam enters the dry module 21 and the wet module 22 at the same time, and the condensation amount on both sides is automatically distributed according to the thermal resistance of the dry module 21 and the wet module 22. At this time, the dry module 21 and the wet module 22 condense the exhaust steam in parallel, thereby fully distributing the condensation amount and increasing multiple heat exchange areas to integrate water-saving and power-saving effects.

[0047] The filler part 30 is provided at the lower side of the wet module 22 and is used to receive the spray water dripping from the wet module 22 so that the filler part 30 can moisten the surface and cool the spray water under the action of wind, so that the spray water temperature returns to normal.

[0048] The condensation water tank 40 is arranged at the lower side of the dry module 21. The condensation water tank 40 is used to hold condensation water so that the condensation water tank 40 can receive the condensation water output by the dry module 21 and the wet module 22, thereby facilitating the collection of the condensation water output by the dry module 21 and the wet module 22, and avoiding the condensation water output by the dry module 21 and the wet module 22 from flowing out of the condensation water tank 40. At the same time, the condensation water tank 40 is a closed tank body.

[0049] The dry module 21 is a finned heat sink. External air passes through it and removes the heat output by the finned heat sink. This interaction between the finned heat sink and the external air removes heat, allowing the dry module 21 to effectively maintain a relatively stable temperature range, ensuring its normal operation. The wet module 22 is a corrugated heat exchange tube. It uses the evaporation of water combined with the flow of air to remove heat and achieve condensation. The dry module 21 and the wet module 22 condense the exhaust steam in parallel, effectively distributing the condensation capacity and increasing the heat exchange area to achieve integrated water and electricity savings.

[0050] After the exhaust steam enters, it flows in parallel to the dry module 21 and the wet module 22, and automatically distributes the exhaust steam flow according to the different thermal resistances on both sides. At this time, when the temperature is low, the dry module 21 has a faster condensation rate due to its large heat exchange area and low temperature, and the local condensation pressure is slightly low. The exhaust steam automatically flows more to the dry module 21 until the condensation pressure is balanced. At this time, the load borne by the dry module 21 is higher; on the contrary, when the temperature is high, the condensation rate of the dry module 21 decreases, and the local condensation pressure is slightly high. At this time, the exhaust steam automatically flows more to the wet module 22, so that the dry module 21 and the wet module 22 can fully distribute the condensation amount, and increase multiple heat exchange areas to integrate water-saving and electricity-saving effects.

[0051] After the exhaust steam is condensed, condensed water is generated and flows downward. The condensed water of the dry module 21 and the wet module 22 flows to the condensed water tank 40 and is pumped away from the condensed water outlet using a condensed water pump. At this time, a vacuum pump is used to pump away the trace non-condensable gas in the exhaust steam from the non-condensable gas outlet to achieve drainage and exhaust of the condensing device 100.

[0052] The condensing device 100 also includes a spray pump 50, which is arranged on the outside of the shell 10 so that the spray pump 50 does not occupy the internal space of the shell 10. At the same time, the maintenance convenience and overhaul convenience of the spray pump 50 are improved. The spray pump 50 draws water from the spray water outlet and sends it to the spray water inlet. The water enters the shell 10 and is distributed by a nozzle to the outer surface of the heat exchange tube of the wet module 22 to keep the wet module 22 moist and maintain surface evaporation to achieve wet spraying. The spray pump 50 maintains the moistening and evaporative cooling effect of the wet module 22 by circulating spray water, thereby maintaining the efficient operation of the condensing device 100.

[0053] After spray water falls from the outer surface of the heat exchange tubes, its temperature rises slightly due to the influence of the tube temperature. It then drips onto the packing 30, where it evaporates and cools the spray water down to room temperature, achieving cooling through the spray water. The cooled spray water drips onto the tray for storage. After prolonged use, the spray water becomes concentrated and contaminated, and is discharged through the drain port. Fresh water is continuously replenished through the water replenishment port to replace water lost through evaporation and drainage, maintaining the water level in the tray and facilitating both the drainage and replenishment of the spray water, thus facilitating the circulation of the spray water.

[0054] The condenser 100 also includes a fan 60, which is used to output air. This air flows in parallel through the dry module 21, the packing section 30, and the wet module 22, integrating the heat dissipation mechanisms of the dry module 21, the packing section 30, and the wet module 22. The dry module 21 is suitable for high-temperature, low-humidity environments, while the wet module 22 utilizes evaporative cooling to improve efficiency. The packing section 30 enhances evaporation and improves heat dissipation efficiency, ensuring stable operation of the condenser 100. The air flow also prevents scaling and clogging on the surfaces of the dry module 21, the packing section 30, and the wet module 22, thereby extending the service life of the condenser 100.

[0055] A control method for a condensing device 100 is applied to the above-mentioned condensing device 100. The control method for the condensing device 100 includes:

[0056] Collect the set negative pressure and the actual measured negative pressure, and compare the set negative pressure and the actual measured negative pressure;

[0057] The absolute values ​​of the set negative pressure and the actual measured negative pressure are input into the PID controller, wherein the absolute value of the set negative pressure is input into the positive end, and the absolute value of the actual measured negative pressure is input into the negative end as the feedback value; when the absolute value of the actual measured negative pressure is too small, the output control quantity develops in the direction of increase.

[0058] At the same time, the control error is collected, and the control error is: e = set negative pressure absolute value - actual measured negative pressure absolute value;

[0059] Control volume And take smoothing filter;

[0060] The three coefficients are P, I, and D control coefficients respectively; the control amount is limited and sorted into numbers between 0 and 10000; 0 represents no output at all, and 10000 represents maximum output;

[0061] The corresponding water-saving mode or electricity-saving mode is triggered according to the water consumption parameters or electricity consumption parameters of the region.

[0062] In the water-saving mode, the speed of the fan 60 and the spray pump 50 is determined as follows:

[0063] The speed command for the fan 60 is u / 0.75 and is limited to [0, 10000]. That is, when the control variable u ≥ 7500, the fan 60 reaches its maximum speed. The speed command for the spray pump 50 is 4(u-7500) and is limited to [0, 10000]. That is, water spraying is only started when u > 7500. The above control method ensures that if the vacuum is insufficient, the fan 60 speed is first operated to the maximum, and water spraying is minimized to reduce water consumption. If the vacuum is still insufficient after the fan 60 speed reaches the maximum, water spraying is resumed, and the remaining cooling power is achieved by water evaporation, thus achieving maximum water conservation.

[0064] In the power saving mode, the rotation speed of the fan 60 and the spray pump 50 is determined as follows:

[0065] The minimum speed command for fan 60 is maintained at 2000, meaning that fan 60 must operate at a minimum speed of 20%. Subsequently, the speed command for fan 60 is set to u, increasing and decreasing synchronously with the control variable, i.e., fan 60 speed command = u, and is limited to [2000, 10000]. The speed command for spray pump 50 is set to 2(u-5000), and is limited to [0, 10000]. This means that water spraying begins when the control command exceeds 5000, and increases and decreases synchronously with the control variable. This control method prevents water spraying when cooling demand is low, but initiates spraying promptly when the control variable reaches a certain level, relying on water evaporation to achieve a cooling effect, minimizing the operating speed and power consumption of fan 60. Since water spraying only occurs when fan 60 speed reaches a certain level, the dry module 21's high heat dissipation capacity is still utilized, maintaining a water-saving effect.

[0066] This application example is used for a 45T / h condensing steam turbine to achieve exhaust steam condensation. The dry module 21 uses a straight fin heat exchanger with heat exchange tubes running between the fins. The diameter of each heat exchange tube is 19mm, the thickness of the matching fin is 1mm, the center distance of the fin is 3.5mm, and the heat exchange area of ​​the dry module 21 is 16000m 2 .

[0067] The wet module 22 uses a rough surface tube with a diameter of 19mm and a knurled surface. The heat exchange area of ​​the wet module 22 is 2400m 2 .

[0068] The condensing device 100 consists of two identical units in parallel. The air volume of the supporting fans 60 is 2.2 million cubic meters per hour, the air pressure is 180 Pa, and the motor power of the fans 60 is 185 kW. There are two spray pumps 50, one for each unit. The flow rate of each spray pump 50 is 250 m3 / h. 3 / h, the lift is 12m, and the motor power is 15kW. The fan 60 and the spray pump 50 are both driven and speed-regulated by a frequency converter.

[0069] When in use, add desalted water from the water supply port to ensure that the tray has a certain water level. Introduce exhaust steam, and use a vacuum pump to extract non-condensable gas and a condensate pump to extract condensate.

[0070] In order to achieve a stable vacuum degree, the negative pressure is set through the program, that is, the command negative pressure (absolute value) that the device needs to reach is 88kPa. This absolute value represents an absolute pressure of approximately 13kPa, which is the standard absolute pressure of the matching steam turbine.

[0071] The actual negative pressure is measured using an absolute pressure instrument and is also input as an absolute value. For example, -87.05 kPa is represented as 87.05 kPa. The absolute values ​​of the set negative pressure and the actual measured negative pressure are input into the PID controller, with the absolute value of the set negative pressure input to the (+) terminal and the actual measured negative pressure as the feedback value input to the (-) terminal.

[0072] The PID controller is written in C program, where the control error is defined as:

[0073] e=set absolute value of negative pressure - actual absolute value of negative pressure

[0074] Output control quantity And take smoothing filter, the time constant of smoothing filter is 10 seconds.

[0075] The generated control quantity u is limited. When u<0, u=0; when u>10000, u=10000. Therefore, u is sorted into a number between 0 and 10000 to represent the required cooling capacity.

[0076] In water-scarce areas in the north, select "water-saving mode"; in areas in the south where electricity prices are higher, select "electricity-saving mode".

[0077] In the water-saving mode, the speed of the fan 60 and the spray pump 50 is determined as follows:

[0078] The speed command for fan 60 is u / 0.75, and is limited to [0, 10000]. This means that when the control variable u ≥ 7500, fan 60 reaches its maximum speed. When cooling capacity needs to be increased, fan 60 prioritizes reaching its maximum speed, and dry cooling is used whenever possible to minimize water usage.

[0079] The speed command for the sprinkler pump 50 is 4(u - 7500) and is limited to [0, 10000]. This means that water spraying only begins when u > 7500. Water spraying is delayed, only starting when the fan 60 speed rises above 75%. This control method ensures that if the vacuum level is insufficient, the fan 60 speed is prioritized to be run at maximum, minimizing water spraying and reducing water consumption. If the vacuum level is still insufficient after the fan 60 speed reaches maximum, water spraying resumes, relying on water evaporation to achieve the remaining cooling power, thus achieving maximum water conservation.

[0080] In the power saving mode, the rotation speed of the fan 60 and the spray pump 50 is determined as follows:

[0081] The minimum speed command of the fan 60 is maintained at 2000, and the subsequent speed command of the fan 60 = u, that is, it increases and decreases synchronously with the control amount, that is, the speed command of the fan 60 is limited to [2000, 10000].

[0082] The speed command for spray pump 50 is 2(u-5000), and is limited to [0, 10000]. This means that water spraying begins when fan 60 speed exceeds 50%, and increases and decreases synchronously with the control variable. This control method ensures timely water spraying, with the water spray volume increasing synchronously with the air volume of fan 60, while also controlling the vacuum level. Because the cooling effect is rapidly enhanced by water spraying, the speed of fan 60 is minimized, minimizing power consumption.

[0083] The condensing device 100 and the control method of the present invention have the following beneficial effects:

[0084] Ensure the vacuum device has ample dry and wet heat exchange area to ensure adequate vacuum, and have a reasonable control method to stabilize the vacuum near the specified value. Avoid the construction of cooling towers and cooling water pipelines. The device uses direct condensation, avoiding the use of large flows of circulating cooling water. It has its own cooling capacity, eliminating the need for cooling towers and cooling water pipelines.

[0085] The device does not use a large flow of cooling water and does not need to be equipped with a traditional cooling water pump, so there is no power consumption for this part. The device is equipped with a larger dry heat exchange module, which has a significant water-saving effect compared to the traditional condenser, saving more than 50% on average throughout the year. The device itself includes the functions of a condenser, a cooling tower, and a cooling water pump. There is no need to build a cooling tower, and it avoids long-distance underground water pipes, which can save land occupation. Compared with the air-cooled island, the device of the present invention has a wet module 22, which can meet the cooling needs in the summer. Therefore, the scale of the dry module 21 is smaller than the air-cooled island, and the cost is at least 50% lower than that of the air-cooled island. In winter, the device can be fully operated using the dry module 21, and no water is sprayed, which can avoid the occurrence of white mist in the cooling tower.

[0086] Compared with the prior art, the present invention has the following beneficial effects:

[0087] The present invention provides a condensing device 100 and a control method thereof, wherein a heat exchange component 20 is accommodated in a shell 10; the heat exchange component 20 includes a dry module 21 and a wet module 22, which are arranged in parallel, and exhaust steam is simultaneously introduced into the dry module 21 and the wet module 22, and the condensation amount on both sides is automatically distributed according to the thermal resistance of the dry module 21 and the wet module 22; a packing portion 30 is arranged on one side of the wet module 22, and the packing portion 30 is used to receive spray water dripping from the wet module 22; a condensation water tank 40 is arranged on one side of the dry module 21, and the condensation water tank 40 is used to hold condensation water. At this time, the dry module 21 and the wet module 22 condense the exhaust steam in parallel, thereby fully distributing the condensation amount and increasing multiple heat exchange areas to integrate water-saving and power-saving effects. Meanwhile, in the control method of the condensing device 100 , the water-saving mode and the power-saving mode respectively represent saving water and power as much as possible, so as to achieve the required balance between the spraying amount and the power consumption of the fan 60 .

[0088] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0089] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0090] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0091] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A condensing device, characterized in that: include: case; a heat exchange assembly housed in the housing; the heat exchange assembly includes a dry module and a wet module, the dry module and the wet module being arranged in parallel, exhaust steam passing through the dry module and the wet module simultaneously, and the condensation amount on both sides is automatically distributed according to the thermal resistance of the dry module and the wet module; a filler portion, disposed on one side of the wet module, and configured to receive spray water dripping from the wet module; A condensed water tank is provided on one side of the dry module and is used for containing condensed water.

2. The condensing device according to claim 1, characterized in that: The dry module is a finned radiator, and the external air passes through the finned radiator and takes away the heat output by the finned radiator; The wet module is a pockmarked heat exchange tube that uses the evaporation of water combined with the flow of air to remove heat to achieve condensation.

3. The condensing device according to claim 2, characterized in that: After the exhaust steam enters, it flows in parallel to the dry module and the wet module, and the exhaust steam flow is automatically distributed according to the different thermal resistances on both sides. At this time, when the temperature is low, the dry module has a faster condensation rate due to its large heat exchange area and low temperature, and the local condensation pressure is slightly low. The exhaust steam automatically flows more to the dry module until the condensation pressure is balanced. At this time, the dry module bears a higher load; On the contrary, when the temperature is high, the condensation rate of the dry module decreases and the local condensation pressure is slightly higher. At this time, the exhaust steam automatically flows more to the wet module.

4. The condensing device according to claim 3, characterized in that: After the exhaust steam is condensed, condensed water is generated and flows downward. The condensed water of the dry module and the wet module flows to the condensed water tank and is pumped away from the condensed water outlet using a condensed water pump. At this time, a vacuum pump is used to pump away the trace non-condensable gas in the exhaust steam from the non-condensable gas outlet.

5. The condensing device according to any one of claims 1 to 4, characterized in that: The condensing device also includes a spray pump, which is arranged on the outside of the shell. The spray pump draws water from the spray water outlet and sends it to the spray water inlet. The water enters the shell and is distributed using a nozzle to spray the water onto the outer surface of the heat exchange tube of the wet module, thereby keeping the wet module moist and maintaining surface evaporation.

6. The condensing device according to claim 5, characterized in that: After the spray water falls from the outer surface of the heat exchange tube, its temperature rises to a certain extent due to the influence of the heat exchange tube temperature. It drips onto the packing part, and evaporates through the surface of the packing part, reducing the temperature of the spray water to room temperature. The cooled spray water drips onto the tray for standby use. After long-term use, the spray water becomes concentrated and dirty, and is discharged through the drain port. Fresh water is continuously added through the water replenishment port to make up for the water lost due to evaporation and drainage, and maintain the water level in the tray.

7. The condensing device according to claim 1, characterized in that: The condensing device further includes a fan, which is used to output air. The air flows through the dry module, the filler part, and the wet module in parallel.

8. A method for controlling a condensing device, characterized in that: Applicable to the condensing device according to any one of claims 1 to 7; The control method of the condensing device includes: Collect the set negative pressure and the actual measured negative pressure, and compare the set negative pressure and the actual measured negative pressure; The absolute values ​​of the set negative pressure and the actual measured negative pressure are input into the PID controller, wherein the absolute value of the set negative pressure is input into the positive end, and the absolute value of the actual measured negative pressure is input into the negative end as the feedback value; when the absolute value of the actual measured negative pressure is too small, the output control quantity develops in the direction of increase.

9. The control method of the condensing device according to claim 8, characterized in that: Acquisition control error, control error: e = set negative pressure absolute value - actual measured negative pressure absolute value; Control volume And take smoothing filter; The three coefficients are P, I, and D control coefficients respectively; the control amount is limited and sorted into numbers between 0 and 10000; 0 represents no output at all, and 10000 represents maximum output; The corresponding water-saving mode or electricity-saving mode is triggered according to the water consumption parameters or electricity consumption parameters of the region.

10. The control method of the condensing device according to claim 8, characterized in that: In water-saving mode, the speed of the fan and sprinkler pump is determined as follows: The fan speed command = u / 0.75 and is limited to [0,10000]. That is, when the control variable u ≥ 7500, the fan reaches its maximum speed. The spray pump speed command = 4(u-7500) and is limited to [0,10000]. That is, water spraying will only start when u > 7500. The above control method ensures that if the vacuum is insufficient, the fan speed is prioritized to the maximum, and water spraying is minimized, thus reducing water consumption. If the vacuum is still insufficient after the fan speed reaches the maximum, water spraying will be resumed, relying on water evaporation to achieve the remaining cooling power, thus achieving maximum water conservation. In power saving mode, the speed of the fan and sprinkler pump is determined as follows: The minimum fan speed command is maintained at 2000, meaning the fan must operate at a minimum speed of 20%. The subsequent fan speed command is set to u, increasing and decreasing synchronously with the control variable, with a limit of [2000, 10000]. The spray pump speed command is set to 2(u-5000) and limited to [0, 10000]. This means water spraying begins when the control command exceeds 5000 and increases and decreases synchronously with the control variable. This control method prevents water spraying when cooling demand is low, but initiates spraying promptly when the control variable reaches a certain level, relying on water evaporation to achieve cooling, minimizing fan speed and power consumption. Since water spraying only occurs when the fan speed reaches a certain level, the dry module's maximum heat dissipation capacity is still utilized, resulting in water savings.

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