Generator set water vapor sampling system and water vapor sampling control method

Abstract

The application discloses a generator set water vapor sampling system and a water vapor sampling control method. The generator set water vapor sampling system comprises a generator set, a control system, a desalted water tank and a plurality of water vapor sampling ports. The desalted water tank is connected with a desalted water inlet pipeline and a desalted water outlet pipeline. A desalted water pump is connected in series on the desalted water outlet pipeline. The system further comprises a collecting device and a cooling module. The cooling module comprises a plurality of parallel cooling units. Each cooling unit comprises a plurality of coolers, a cooling flow path, a main water sample flow path, a bypass water sample flow path and a water sample outlet flow path. A first temperature transmitter is arranged at the outlet end of the water sample outlet flow path. The control system is adapted to control the flow of the desalted water outlet pipeline and the flow state of the main water sample flow path and the bypass water sample flow path according to the outlet end temperature of the water sample outlet flow path. According to the generator set water vapor sampling system, the temperature of the water sample can be automatically adjusted, thereby reducing the difficulty of water vapor sampling of the generator set.

Description

Technical Field

[0001] This invention relates to the field of generator set technology, and in particular to a generator set water vapor sampling system and water vapor sampling control method. Background Technology

[0002] Steam quality monitoring is a crucial means of ensuring the safe and economical operation of power plants. Typically, ultra-supercritical units generate steam temperatures exceeding 600℃ and pressures exceeding 35MPa. High-temperature, high-pressure samples cannot meet the requirements for steam quality monitoring. During unit operation, power plants employ a combination of manual laboratory sampling and analysis, along with online chemical instrument monitoring, to supervise steam quality. To meet sampling needs and ensure personnel safety, the steam-water sampling system processes steam samples to ambient temperature and pressure for both manual sampling and continuous monitoring by online chemical instruments. Power plants are generally equipped with centralized steam-water sampling devices, primarily consisting of closed-loop demineralized water cooling systems, intelligent cooling and pressure-reducing racks, and cryogenic instrument panels. These systems de-temperature and de-pressure the water samples entering the cryogenic instrument panel, ensuring the safety of manual sampling and the reliability of online instrument monitoring. In some technologies, operators need to manually adjust the demineralized water cooling system to regulate the steam sampling temperature when cooling the steam samples, making steam sampling quite challenging. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a generator set water vapor sampling system, which can automatically adjust the water sample temperature.

[0004] The present invention also proposes a water vapor sampling control method for the water vapor sampling system of the above-mentioned generator set.

[0005] According to a first aspect of the present invention, a generator set water vapor sampling system includes: a generator set having a control system, a demineralized water tank, and multiple water vapor sampling ports; the demineralized water tank being connected to a demineralized water inlet pipe and a demineralized water outlet pipe, and a demineralized water pump being connected in series on the demineralized water outlet pipe; a collection device for collecting and detecting water vapor; and a cooling module including multiple parallel cooling units, each cooling unit including multiple coolers, a cooling flow path, a main water sample flow path, a bypass water sample flow path, and a water sample outlet path; the cooling flow path being connected between the demineralized water outlet pipe and the demineralized water inlet pipe and sequentially passing through the multiple coolers; and the water sample... The main flow path connects the water vapor sampling port and the water sample outlet path and passes through multiple coolers in sequence. The water sample outlet path is adapted to communicate with the collection device. One end of the water sample bypass path is adapted to communicate with the outlet end of the main water sample flow path, and the other end of the water sample bypass path is adapted to communicate with the main water sample flow path upstream of one of the coolers. A first temperature transmitter is provided at the outlet end of the main water sample flow path. The demineralized water pump and the first temperature transmitter are both electrically connected to the control system. The control system is adapted to control the flow rate of the demineralized water outlet pipeline and the communication status between the water sample bypass path and the main water sample flow path according to the water sample temperature at the outlet end of the main water sample flow path.

[0006] According to the generator set water vapor sampling system of the first aspect of the present invention, the control system controls the flow rate of the demineralized water outlet pipe and the connection status between the water sample bypass and the water sample main flow based on the water sample temperature at the outlet end of the main water sample flow path, thereby realizing automatic adjustment of the water sample temperature and reducing the difficulty of water vapor sampling.

[0007] According to some embodiments of the present invention, a first three-way valve is connected in series on the main water sample flow path upstream of one of the coolers in the cooling unit, the outlet end of the main water sample flow path is connected to the water sample outflow path through a second three-way valve, the water sample bypass path is connected between the first three-way valve and the second three-way valve, and both the first three-way valve and the second three-way valve are electrically connected to the control system.

[0008] According to some embodiments of the present invention, a pressure reducing valve is also connected in series on the water sample outlet path, and a first pressure transmitter is also provided at the outlet end of the water sample outlet path. The control system is adapted to control the opening degree of the pressure reducing valve according to the water vapor pressure flowing out of the water sample outlet path.

[0009] According to some embodiments of the present invention, the demineralized water outlet pipeline includes a first branch and a second branch, the first branch and the second branch are connected in parallel and connected between the demineralized water tank and the cooling flow path, a first demineralized water pump is connected in series on the first branch, a second demineralized water pump is connected in series on the second branch, and both the first demineralized water pump and the second demineralized water pump are electrically connected to the control system.

[0010] According to some embodiments of the present invention, the outlet end of the demineralized water outlet pipeline is provided with a second temperature transmitter, a first flow transmitter and a second pressure transmitter. The second temperature transmitter, the first flow transmitter and the second pressure transmitter are all electrically connected to the control system. The control system is adapted to control the flow state in the demineralized water outlet pipeline according to the outlet water temperature, flow rate and pressure of the demineralized water outlet pipeline.

[0011] According to some embodiments of the present invention, an online conductivity meter is further provided on the demineralized water outlet pipeline, and the online conductivity meter is electrically connected to the control system; the demineralized water tank is further provided with a drain valve and an inlet valve, the inlet valve is adapted to be connected to an external water circuit, and both the drain valve and the inlet valve are electrically connected to the control system, the control system being adapted to control the opening and closing states of the drain valve and the inlet valve according to the conductivity of the demineralized water in the demineralized water outlet pipeline.

[0012] According to some embodiments of the present invention, the demineralized water tank is provided with a level controller, the level controller is electrically connected to the control system, and the control system is adapted to control the opening degree of the drain valve according to the level of the demineralized water tank.

[0013] According to some embodiments of the present invention, the demineralized water tank is further provided with an inlet bypass valve, which is adapted to be connected to an external water circuit.

[0014] According to some embodiments of the present invention, the generator set water vapor sampling system further includes: a water-cooled flow path, which is connected to the demineralized water outlet pipeline for heat exchange via a heat exchanger.

[0015] According to some embodiments of the present invention, the inlet end of the water-cooled flow path is provided with a third temperature transmitter, a second flow transmitter and a third pressure transmitter, and the third temperature transmitter, the second flow transmitter and the third pressure transmitter are all electrically connected to the control system.

[0016] According to some embodiments of the present invention, the water flow parameters at the inlet of the water-cooled flow path satisfy the following: water temperature less than or equal to 30°C, flow rate less than 50t / h, and pressure greater than or equal to 0.2Mpa and less than or equal to 0.7Mpa.

[0017] According to the second aspect of the present invention, a water vapor sampling control method is applied to the generator set water vapor sampling system according to the first aspect of the present invention. The water vapor sampling control method includes: S1, obtaining the water sample outflow temperature t1 of the water sample outflow path; S2, comparing t1 with a first set temperature T1, if t1 < T1, then controlling the water sample bypass path to disconnect from the water sample main flow path, and controlling the water sample main flow path to connect with the collection device; if t1 ≥ T1, then controlling both ends of the water sample bypass path to connect with the water sample main flow path respectively, controlling the water sample main flow path to disconnect from the collection device, controlling the demineralized water pump to increase the flow rate in the demineralized water outlet pipeline, and repeating step S1.

[0018] According to the water vapor sampling control method of the second aspect of the present invention, the water vapor sampling system of the generator set can automatically adjust the water sample temperature, thereby reducing the difficulty of water vapor sampling.

[0019] According to some embodiments of the present invention, before the main water sample flow path is connected to the collection device, the method further includes: S21, acquiring the water sample pressure P at the outlet end of the water sample flow path. 水样 S22, Comparison of water sample pressure P 水样 Compared with the first set pressure P1 and the second set pressure P2, where P1 is less than P2, if P 水样 If P1 < P1, then reduce the opening of the pressure reducing valve until P1 < P2 ... 水样 Satisfy: P1≤P 水样 ≤P2, control the main water sample flow path to connect with the collection device, if P 水样 If the value is greater than P2, increase the opening of the pressure reducing valve until P2 is reached. 水样 Satisfy: P1≤P 水样 ≤P2, control the main water sample flow path to connect with the collection device, if P 水样 Satisfy: P1≤P 水样 If ≤P2, then the opening of the pressure reducing valve remains unchanged, and the main water sample path is connected to the collection device.

[0020] According to some embodiments of the present invention, the demineralized water outlet pipeline includes a first branch and a second branch, wherein a first demineralized water pump is connected in series on the first branch and a second demineralized water pump is connected in series on the second branch. Between steps S1 and S2, the pipeline further includes: S11, controlling the first demineralized water pump to enter a working state; S12, acquiring the temperature t2, flow rate Q, and pressure P of the water outlet from the demineralized water outlet pipeline. 除盐 S13, for t2, Q and P 除盐 Make a judgment: If the water outlet of the demineralized water outlet pipe satisfies: t2 ≤ second set temperature T2 and Q ≥ set flow rate Q1 and P 除盐 When the third set pressure P3 is reached, the first demineralized water pump is kept in operation, and the second demineralized water pump is stopped. The process proceeds to step S2. If the water output from the demineralized water outlet pipe satisfies: t2 > T2 or Q < Q1 or P 除盐When P < P3, control the first demineralized water pump to increase its operating frequency until the water outlet of the demineralized water pipeline satisfies: t2≤T2 and Q≥Q1 and P 除盐 If the power of the first demineralized water pump reaches its maximum value but still cannot satisfy: t2≤T2 and Q≥Q1 and P 除盐 If ≥P3, then control the second demineralized water pump to operate, and adjust the frequency of the second demineralized water pump according to the above parameters until the following conditions are met: t2≤T2 and Q≥Q1 and P 除盐 If ≥P3, proceed to step S2.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a generator set water vapor sampling system according to an embodiment of the present invention;

[0023] Figure 2 This is a flowchart of a water vapor sampling and control method according to an embodiment of the present invention;

[0024] Figure 3 This is a flowchart of a water vapor sampling and control method according to another embodiment of the present invention;

[0025] Figure 4 This is a flowchart of a water vapor sampling and control method according to another embodiment of the present invention.

[0026] Figure label:

[0027] 100. Generator set water vapor sampling system;

[0028] 10. Control system;

[0029] 20. Data acquisition device;

[0030] 30. Demineralized water tank; 31. Demineralized water inlet pipe; 32. Demineralized water outlet pipe; 321. First branch; 322. Second branch; 323. Second temperature transmitter; 324. First flow transmitter; 325. Second pressure transmitter; 326. Online conductivity meter; 33. Demineralized water pump; 331. First demineralized water pump; 332. Second demineralized water pump; 34. Inlet valve; 35. Drain valve; 36. Inlet bypass valve;

[0031] 40. Cooling unit; 41. Cooler; 411. Precooler; 412. High-efficiency cooler; 42. Cooling flow path; 43. Main water sample flow path; 431. First three-way valve; 432. Second three-way valve; 433. First temperature transmitter; 44. Water sample bypass path; 45. Water sample outlet path; 451. Pressure reducing valve; 452. First pressure transmitter;

[0032] 50. Water-cooled flow path; 51. Third temperature transmitter; 52. Second flow transmitter; 53. Third pressure transmitter;

[0033] 60. Heat exchanger. Detailed Implementation

[0034] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0035] The following is for reference. Figures 1-4 A generator set water vapor sampling system 100 according to an embodiment of the first aspect of the present invention is described.

[0036] like Figure 1 and Figure 2 As shown, a generator set water vapor sampling system 100 according to a first aspect embodiment of the present invention includes: a control system 10, a generator set, a sampling device 20, and a cooling module.

[0037] Specifically, the generator set includes a demineralized water tank 30 and multiple water vapor sampling ports. The demineralized water tank 30 is connected to a demineralized water inlet pipe 31 and a demineralized water outlet pipe 32. A demineralized water pump 33 is connected in series on the demineralized water outlet pipe 32. The sampling device 20 is used to collect water vapor and perform detection. The cooling module includes multiple parallel cooling units 40. For example, there can be two, three or four water vapor sampling ports, and there can be two, three or four cooling units 40. The water vapor sampling ports and the cooling units 40 correspond one-to-one.

[0038] The cooling unit 40 includes multiple coolers 41, a cooling flow path 42, a main water sample flow path 43, a bypass water sample flow path 44, and a water sample outlet path 45. For example, there can be two, three, or four coolers 41. The cooling flow path 42 is connected between the demineralized water outlet pipe 32 and the demineralized water inlet pipe 31 and passes through multiple coolers 41 in sequence. The main water sample flow path 43 is connected between the water vapor sampling port and the water sample outlet path 45 and passes through multiple coolers 41 in sequence. The water sample outlet path 45 is adapted to communicate with the sampling device 20. The water sample bypass path... One end of the water sample bypass 44 is adapted to be connected to the outlet end of the main water sample path 43, and the other end of the water sample bypass 44 is adapted to be connected to the main water sample path 43 upstream of one of the coolers 41. The outlet end of the main water sample path 43 is provided with a first temperature transmitter 433. The demineralized water pump 33 and the first temperature transmitter 433 are both electrically connected to the control system 10. The control system 10 is adapted to control the flow rate of the demineralized water outlet pipe 32 and the flow status of the water sample bypass 44 and the main water sample path 43 according to the water sample temperature at the outlet end of the main water sample path 43.

[0039] The data acquisition device 20 includes a manual data acquisition device and an online device for automatic data acquisition and detection. The cooler 41 includes a precooler 411 and a high-efficiency cooler 412. The cooling efficiency of the precooler 411 is lower than that of the high-efficiency cooler 412. The precooler 411 is located at the first point through which the water sample main flow path 43 passes. Preferably, the other end of the water sample bypass path 44 is adapted to connect with the upstream side of the water sample main flow path 43 of the high-efficiency cooler 412, which is the first point through which the water sample main flow path 43 passes. The water vapor sampling port can discharge feedwater samples, boiler water samples, saturated steam samples, or superheated steam samples from the generator set.

[0040] During the operation of the generator set water vapor sampling system 100, water vapor flows from the water vapor sampling hole into the main water sample path 43, then passes through multiple coolers 41 in sequence and flows out from the outlet end of the water sample outlet path 45. Simultaneously, the demineralized water pump 33 drives the demineralized water in the demineralized water tank 30 to flow in the loop formed by the demineralized water outlet pipe 32, the cooling flow path 42, and the demineralized water inlet pipe 31. The demineralized water exchanges heat with the water sample in the coolers 41. The first temperature transmitter 433 detects the temperature of the water sample flowing out of the main water sample path 43, and the control system 10 determines the water sample temperature as follows:

[0041] When the water sample temperature at the outlet of the main water sample path 43 is lower than 40°C, the control system 10 determines that the water sample temperature meets the sampling requirements. The control system 10 controls the water sample bypass path 44 to disconnect from the main water sample path 43. The operator connects the water sample outflow path 45 to the collection device 20, and the water sample flows out from the water sample outflow path 45 to the collection device 20.

[0042] When the water sample temperature at the outlet of the main water sample path 43 is greater than or equal to 40°C, the control system 10 determines that the water sample temperature is higher than the sampling requirement. At this time, the water sample outflow path 45 is disconnected from the collection device 20, one end of the water sample bypass path 44 is connected to the outlet of the water sample outflow path 45, and the other end of the water sample bypass path 44 is connected to the upstream side of the main water sample path 43 of the first high-efficiency cooler 412 that the main water sample path 43 passes through. Part of the water vapor in the water sample outflow path 45 flows directly to the outside, and the other part is cooled twice by the high-efficiency cooler 412 through the water sample bypass path 44. At the same time, the control system 10 controls the demineralized water pump 33 to increase the flow rate of the demineralized water outlet pipe 32. Thus, a part of the water sample participates in multiple circulation cooling, which can reduce the waste of water sample. In addition, the increased flow rate of the demineralized water outlet pipe 32 can increase the flow rate of the demineralized water in the cooler 41, thereby increasing the heat exchange efficiency of the water vapor.

[0043] The control system 10 is equipped with a set flow rate increment step. After the flow rate in the demineralized water outlet pipe 32 increases, the demineralized water circulation is maintained for a set time. If the water sample temperature is still greater than or equal to 40°C, the flow rate is increased by one step and the above process continues until the water sample temperature is lower than 40°C. If the water sample temperature cannot be lowered below 40°C only after the number and power of the demineralized water pumps 33 in operation reach their maximum values, it is determined that the power of the demineralized water pumps 33 cannot meet the working requirements, and a higher-power demineralized water pump 33 and a matching pipeline are needed.

[0044] When the water sample temperature is below 40℃, the control system 10 controls the water sample bypass path 44 to disconnect from the water sample main path 43, and the collection device 20 collects the water sample normally.

[0045] This allows for automatic adjustment of the water sample temperature.

[0046] In this case, the generator set water vapor sampling system 100 can be equipped with relevant components to automatically control the water sample outlet path 45 to connect with the collection device 20, or the operator can manually connect the water sample outlet path 45 to the collection device 20.

[0047] According to the first aspect of the present invention, the generator set water vapor sampling system 100, the control system 10 controls the flow rate of the demineralized water outlet pipe 32 and the connection status of the water sample bypass pipe 44 and the water sample main flow pipe 43 based on the water sample temperature at the outlet end of the water sample main flow pipe 43, thereby realizing automatic adjustment of the water sample temperature and reducing the difficulty of water vapor sampling.

[0048] In some embodiments of the present invention, such as Figure 1As shown, a first three-way valve 431 is connected in series on the main water flow path 43 upstream of a cooler 41 in the cooling unit 40. The outlet end of the main water flow path 43 is connected to the water flow path 45 through a second three-way valve 432. The water flow bypass path 44 is connected between the first three-way valve 431 and the second three-way valve 432. Both the first three-way valve 431 and the second three-way valve 432 are electrically connected to the control system 10.

[0049] The first three-way valve 431 has a first interface, a second interface and a third interface. The first interface and the second interface are connected in series on the main water sample flow path 43, and the third interface is connected to the water sample bypass path 44. The second three-way valve 432 has a fourth interface, a fifth interface and a sixth interface. The fourth interface and the fifth interface are connected to the main water sample flow path 43 and the water sample outflow path 45, respectively, and the sixth interface is connected to the water sample bypass path 44.

[0050] When the water sample temperature at the outlet of the main water sample channel 43 is below 40℃, the control system 10 controls the first and second interfaces to connect, the third interface to disconnect from the first and second interfaces, the control system 10 controls the fourth and fifth interfaces to connect, and the sixth interface to disconnect from the fourth and fifth interfaces.

[0051] When the water sample temperature at the outlet of the main water sample path 43 is greater than or equal to 40°C, the control system 10 controls the first, second, and third interfaces to connect, and the control system 10 controls the fourth, fifth, and sixth interfaces to connect, thus enabling the connection between the water sample bypass path 44 and the main water sample path 43.

[0052] Thus, the control system 10 can control the connection state of the water sample bypass path 44 and the water sample main path 43.

[0053] In some embodiments of the present invention, such as Figure 1 and Figure 3 As shown, a pressure reducing valve 451 is connected in series on the water sample outlet 45, and a first pressure transmitter 452 is also provided at the outlet end of the water sample outlet 45. The control system 10 is adapted to control the opening degree of the pressure reducing valve 451 according to the water vapor pressure flowing out of the water sample outlet 45.

[0054] The first pressure transmitter 452 is used to detect the water vapor pressure flowing out of the water sample outlet 45. Preferably, the suitable range of water vapor pressure is 0.1MPa-1.0MPa. During the sampling process, the first pressure transmitter 452 detects the water vapor pressure. When the water vapor pressure is less than 0.1MPa, the control system 10 controls the pressure reducing valve 451 to reduce the opening until the water vapor pressure rises to 0.1MPa-1.0MPa. When the water vapor pressure is greater than 1.0MPa, the control system 10 controls the pressure reducing valve 451 to increase the opening until the water vapor pressure drops to 0.1MPa-1.0MPa.

[0055] This allows for automatic adjustment of water sample pressure, thereby further reducing the difficulty of water vapor sampling.

[0056] It is understood that the pressure reducing valve 451 can also adjust the flow rate of water vapor. Preferably, the pressure reducing valve 451 controls the water vapor flow rate to be greater than or equal to 1500 mL / min.

[0057] In some embodiments of the present invention, such as Figure 1 As shown, the demineralized water outlet pipeline 32 includes a first branch 321 and a second branch 322. The first branch 321 and the second branch 322 are connected in parallel and between the demineralized water tank 30 and the cooling flow path 42. A first demineralized water pump 331 is connected in series on the first branch 321, and a second demineralized water pump 332 is connected in series on the second branch 322. Both the first demineralized water pump 331 and the second demineralized water pump 332 are electrically connected to the control system 10.

[0058] By setting up a first branch 321 and a second branch 322, and by setting up a first demineralized water pump 331 and a second demineralized water pump 332 on the first branch 321 and the second branch 322 respectively, the flow rate adjustment range in the demineralized water outlet pipeline 32 can be increased. During the sampling process, more flow rate steps can be set, thereby improving the accuracy of water sample temperature control.

[0059] In some embodiments of the present invention, such as Figure 1 As shown, the outlet end of the demineralized water outlet pipeline 32 is equipped with a second temperature transmitter 323, a first flow transmitter 324, and a second pressure transmitter 325. The second temperature transmitter 323, the first flow transmitter 324, and the second pressure transmitter 325 are all electrically connected to the control system 10. The control system 10 is adapted to control the flow state in the demineralized water outlet pipeline 32 according to the outlet water temperature, flow rate, and pressure of the demineralized water outlet pipeline 32.

[0060] During the operation of the generator set water vapor sampling system 100, the second temperature transmitter 323 acquires the temperature in the demineralized water outlet pipe 32 downstream of the heat exchanger 60, the first flow transmitter 324 acquires the flow rate in the demineralized water outlet pipe 32 downstream of the heat exchanger 60, and the second pressure transmitter 325 acquires the water pressure in the demineralized water outlet pipe 32 downstream of the heat exchanger 60. The control system 10 judges the above temperature, flow rate, and water pressure, such as... Figure 4 As shown, the details are as follows:

[0061] When the temperature is less than 35℃, the flow rate is greater than 20t / h, and the water pressure is greater than 0.4Mpa, the first demineralized water pump 331 on the first branch 321 is in working condition.

[0062] When the temperature is greater than or equal to 35℃, or the flow rate is greater than 20t / h, or the water pressure is greater than 0.4Mpa, the operating frequency of the first demineralized water pump 331 is increased. If the power of the first demineralized water pump 331 reaches its maximum value but still cannot make the temperature less than 35℃, the flow rate greater than 20t / h, and the water pressure greater than 0.4Mpa, then the second demineralized water pump 332 on the second branch 322 is controlled to work, and the frequency of the second demineralized water pump 332 is appropriately increased according to the above parameters until the temperature is less than 35℃, the flow rate greater than 20t / h, and the water pressure greater than 0.4Mpa.

[0063] This allows for automatic adjustment of the temperature, flow rate, and water pressure of the demineralized water outlet pipe 32, thereby further reducing the difficulty of sampling.

[0064] In some embodiments of the present invention, such as Figure 1 As shown, the demineralized water outlet pipe 32 is also equipped with an online conductivity meter 326, which is electrically connected to the control system 10. The demineralized water tank 30 is also equipped with a drain valve 35 and an inlet valve 34. The inlet valve 34 is suitable for connecting to an external water circuit. Both the drain valve 35 and the inlet valve 34 are electrically connected to the control system 10. The control system 10 is suitable for controlling the opening and closing states of the drain valve 35 and the inlet valve 34 according to the conductivity of the demineralized water in the demineralized water outlet pipe 32.

[0065] During the operation of the generator set water vapor sampling system 100, the online conductivity meter 326 detects the conductivity of the demineralized water in the demineralized water outlet pipe 32, and the control system 10 determines the conductivity as follows:

[0066] If the conductivity is greater than 1 μS / cm, the inlet valve 34 and outlet valve 35 are opened, and the demineralized water from the external water circuit enters the demineralized water tank 30 to replace the demineralized water until the conductivity drops to 1 μS / cm or below.

[0067] If the conductivity is less than or equal to 1 μS / cm, both the inlet valve 34 and the outlet valve 35 are in the closed state.

[0068] This allows for automatic adjustment of the conductivity of demineralized water.

[0069] If the conductivity cannot be reduced to 1 μS / cm, inspect components such as heat exchanger 60 to confirm whether they are damaged.

[0070] In some embodiments of the present invention, a level controller is provided in the demineralized water tank 30. The level controller is electrically connected to the control system 10. The control system 10 is adapted to control the opening degree of the drain valve 35 according to the level of the demineralized water tank 30.

[0071] The liquid level controller detects the liquid level in the demineralized water tank 30. When the liquid level in the demineralized water tank 30 is higher than the maximum liquid level, the demineralized water flows out from the overflow tank. At the same time, the control system 10 reduces the opening of the inlet valve 34. Thus, automatic control of the liquid level in the demineralized water tank 30 can be achieved.

[0072] In some embodiments of the present invention, such as Figure 1 As shown, the demineralized water tank 30 is also equipped with an inlet bypass valve 36, which is suitable for connecting to an external water circuit. When the flow rate of the pipeline connected to the inlet valve 34 is insufficient, causing the inlet flow rate to be less than the outlet flow rate, the inlet bypass valve 36 can be opened to replenish water to the demineralized water tank 30 through the water circuit connected to the inlet bypass valve 36. The inlet bypass valve 36 can be opened and closed manually, or it can be controlled to open and close by the control system 10.

[0073] In some embodiments of the present invention, such as Figure 1 As shown, the generator set water vapor sampling system 100 also includes a water-cooled flow path 50, which is connected to the demineralized water outlet pipe 32 via a heat exchanger 60.

[0074] The water-cooled flow path 50 is connected to the external water path. By setting up the water-cooled flow path 50, the water-cooled flow path 50 can exchange heat with the demineralized water outlet pipe 32 through the heat exchanger 60, thereby further improving the cooling efficiency of the cooling module.

[0075] Preferably, the heat exchanger 60 is a plate heat exchanger, and there are two heat exchangers 60. The water-cooled flow path 50 includes two water-cooled branches, and the cooling flow path 42 includes two cooling branches. The water-cooled branches, the heat exchanger 60 and the cooling branches correspond one-to-one.

[0076] When the generator set water vapor sampling system 100 starts working, the demineralized water outlet pipe 32 and the water cooling flow path 50 are connected together. This can make the pressure distribution in the heat exchanger 60 uniform and reduce the probability of heat exchanger 60 damage. When the generator set water vapor sampling system 100 stops working, the demineralized water outlet pipe 32 is cut off first, and then the water cooling flow path 50 is cut off. This ensures that the demineralized water outlet pipe 32 is cooled by cooling water during the circulation process.

[0077] In some embodiments of the present invention, such as Figure 1 As shown, the inlet end of the water-cooled flow path 50 is equipped with a third temperature transmitter 51, a second flow transmitter 52 and a third pressure transmitter 53, all of which are electrically connected to the control system 10.

[0078] During the operation of the generator set water vapor sampling system 100, the third temperature transmitter 51, the second flow transmitter 52, and the third pressure transmitter 53 respectively detect the pressure, temperature, and flow rate of the water flowing into the water-cooled flow path 50, and transmit the data to the control system 10. The control system 10 can process the above data. On the one hand, it can display the data to the operator so that the operator knows the status of the water-cooled flow path 50 and can then process it. On the other hand, it can be linked with other control components to control the flow state of the water-cooled flow path 50.

[0079] In some embodiments of the present invention, the water flow parameters at the inlet of the water-cooled flow path 50 meet the following requirements: water temperature less than or equal to 30°C, flow rate less than 50 t / h, and pressure greater than or equal to 0.2 MPa and less than or equal to 0.7 MPa. Therefore, the cooling water parameters within the water-cooled flow path 50 can meet the operational requirements of the generator set water vapor sampling system 100.

[0080] The water vapor sampling and control method according to a second aspect of the present invention is applied to the generator set water vapor sampling system 100 according to a first aspect of the present invention, such as... Figure 2 As shown, the water vapor sampling control method includes:

[0081] S1. Obtain the water sample outflow temperature t1 from the main water sample channel 43.

[0082] The temperature of the water sample flowing out of the main water sample channel 43 is detected by the first temperature transmitter 433, and the first temperature transmitter 433 transmits the temperature data to the control system 10 so that the control system 10 can obtain the water sample outflow temperature t1.

[0083] S2, compare t1 with the first set temperature T1.

[0084] If t1 < T1, then the bypass path 44 and the main flow path 43 of the water sample are disconnected, and the main flow path 43 of the water sample is connected to the collection device 20.

[0085] The control system 10 determines that the water sample temperature meets the sampling requirements. The control system 10 controls the water sample bypass path 44 to be disconnected from the water sample main path 43 through the first three-way valve 431 and the second three-way valve 432. The water sample main path 43 is connected to the water sample outflow path 45 through the second three-way valve 432. The operator connects the water sample outflow path 45 to the collection device 20. The water sample main path 43 is connected to the collection device 20 through the water sample outflow path 45. The water sample flows out from the water sample outflow path 45 to the collection device 20.

[0086] Preferably, T1 is 40°C.

[0087] If t1≥T1, then control both ends of the water sample bypass path 44 to be connected to the main water sample path 43 respectively, control the main water sample path 43 to be disconnected from the collection device 20, control the demineralized water pump 33 to increase the flow rate in the demineralized water outlet pipe 32, and repeat step S1.

[0088] At this time, the control system 10 determines that the water sample temperature is higher than the sampling requirement, and the water sample outlet 45 is disconnected from the collection device 20. One end of the water sample bypass 44 is connected to the outlet end of the water sample outlet 45 through the second three-way valve 432, and the other end of the water sample bypass 44 is connected to the upstream side of the water sample main flow 43 of the first high-efficiency cooler 412 through the first three-way valve 431. Part of the water vapor in the water sample outlet 45 flows directly to the outside, and the other part is cooled twice by the high-efficiency cooler 412 through the water sample bypass 44. At the same time, the control system 10 controls the demineralized water pump 33 to increase the flow rate of the demineralized water outlet pipe 32. Thus, a part of the water sample participates in multiple circulation cooling, which can reduce the waste of water sample. In addition, the increased flow rate of the demineralized water outlet pipe 32 can increase the cooling flow rate in the cooler 41, thereby increasing the cooling efficiency of the water sample.

[0089] The control system 10 is equipped with a set flow rate increment step. After the flow rate in the demineralized water outlet pipe 32 increases, the demineralized water circulation is maintained for a set time. If the water sample temperature is still greater than or equal to 40°C, the flow rate is increased by one step and the above process continues until the water sample temperature is lower than 40°C. If the water sample temperature cannot be lowered to 40°C only after the number and power of the demineralized water pumps 33 are at their maximum values, it is determined that the power of the demineralized water pumps 33 is insufficient and needs to be replaced with a higher-power demineralized water pump 33 and a matching pipeline.

[0090] When the water sample temperature is below 40℃, the control system 10 controls the water sample bypass path 44 to disconnect from the water sample main path 43, and the collection device 20 collects the water sample normally.

[0091] In some embodiments of the present invention, such as Figure 3 As shown, before the main water sample flow path 43 is connected to the collection device 20, the following is also included:

[0092] S21. Obtain the water sample pressure P at the outlet end of water sample outlet path 45. 水样 .

[0093] The water sample pressure at the outlet of the water sample outlet 45 is detected by the first pressure transmitter 452, and the water sample pressure data is transmitted to the control system 10 so that the control system 10 can obtain the water sample pressure P. 水样 .

[0094] S22, Comparison water sample pressure P 水样Compared with the first set pressure P1 and the second set pressure P2, P1 is less than P2.

[0095] If P 水样 If P1 < P1, then reduce the opening of pressure reducing valve 451 until P1 < P2 ... 水样 Satisfy: P1≤P 水样 ≤P2, control the main water sample flow path 43 to connect with the sampling device 20,

[0096] If P 水样 If the value is greater than P2, then increase the opening of pressure reducing valve 451 until P2 is reached. 水样 Satisfy: P1≤P 水样 ≤P2, control the main water sample flow path (43) to connect with the collection device (20),

[0097] If P 水样 Satisfy: P1≤P 水样 If P2 is less than or equal to 2, the opening of the pressure reducing valve 451 remains unchanged, and the main water sample flow path 43 is connected to the collection device 20.

[0098] Preferably, P1 is 0.1 MPa and P2 is 1 MPa.

[0099] It is understandable that the water vapor pressure needs to be within a suitable range to meet the sampling requirements. The control system 10 controls the opening of the pressure reducing valve 451 according to the above comparison results, which can realize the automatic adjustment of the water sample pressure, thereby further reducing the difficulty of water vapor sampling.

[0100] In some embodiments of the present invention, the demineralized water outlet pipeline 32 includes a first branch 321 and a second branch 322. A first demineralized water pump 331 is connected in series on the first branch 321, and a second demineralized water pump 332 is connected in series on the second branch 322. Figure 4 As shown, the process between step S1 and step S2 also includes:

[0101] S11. Control the first demineralized water pump 331 to enter the working state;

[0102] The control system 10 controls the first demineralized water pump 331 to enter the working state.

[0103] S12. Obtain the temperature t2, flow rate Q, and pressure P of the demineralized water outlet pipe. 除盐 ;

[0104] The second temperature transmitter 323 acquires the temperature t2 in the demineralized water outlet pipe 32 downstream of the heat exchanger 60; the first flow transmitter 324 acquires the flow rate Q in the demineralized water outlet pipe 32 downstream of the heat exchanger 60; and the second pressure transmitter 325 acquires the water pressure P in the demineralized water outlet pipe 32 downstream of the heat exchanger 60. 除盐 .

[0105] S13, for t2, Q and P 除盐 Make a judgment:

[0106] If the water outlet of the demineralized water outlet pipe 32 satisfies: t2≤second set temperature T2 and Q≥set flow rate Q1 and P 除盐 When the third set pressure P3 is reached, the first demineralized water pump 331 is controlled to maintain its working state, and the second demineralized water pump 332 is controlled to stop working, and the process proceeds to step S2.

[0107] At this time, the control system 10 determines that the water output parameters of the demineralized water outlet pipeline 32 meet the working requirements of the generator set water vapor sampling system 100.

[0108] If the water outlet from demineralized water outlet pipe 32 satisfies: t2>T2 or Q<Q1 or P 除盐 When P < P3, control the first demineralized water pump 331 to increase its operating frequency until the water outlet of the demineralized water outlet pipe 32 satisfies: t2≤T2 and Q≥Q1 and P 除盐 If ≥P3, proceed to step S2.

[0109] If the first demineralized water pump 331 reaches its maximum power but still cannot satisfy: t2≤T2 and Q≥Q1 and P 除盐 If ≥P3, then control the second demineralized water pump 332 to operate, and adjust the frequency of the second demineralized water pump 332 according to the above parameters until the following conditions are met: t2≤T2 and Q≥Q1 and P 除盐 If ≥P3, proceed to step S2.

[0110] At this time, it is determined that the water output parameters of the demineralized water outlet pipeline 32 cannot meet the working requirements of the generator set water vapor sampling system 100. By adjusting the water output parameters of the demineralized water outlet pipeline 32 under different conditions by the first demineralized water pump 331 and the second demineralized water pump 332, the adjustment range of the water output parameters of the demineralized water outlet pipeline 32 can be increased.

[0111] Preferably, t2 is 35℃, Q is 20t / h, and P... 除盐 The pressure is 0.4 MPa.

[0112] Understandably, when the water flow rate of the demineralized water outlet pipe 32 is large, its water pressure is also large. In the heat exchanger 60, when the water flow rate of the demineralized water outlet pipe 32 is large, the heat exchange efficiency between the demineralized water in the demineralized water outlet pipe 32 and the cooling water in the water-cooled flow path 50 is also high. Simultaneously, the heat exchange efficiency between the demineralized water and the water sample in the cooling unit 40 is also high. By automatically adjusting the outlet parameters of the demineralized water outlet pipe 32 through the above steps, the generator set water vapor sampling system 100 can maintain normal operation, thereby further reducing the sampling difficulty.

[0113] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0114] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0115] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0116] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0117] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A generator set water vapor sampling system (100), characterized in that, include: The generator set has a control system (10), a demineralized water tank (30) and multiple water vapor sampling ports. The demineralized water tank (30) is connected to a demineralized water inlet pipe (31) and a demineralized water outlet pipe (32). A demineralized water pump (33) is connected in series on the demineralized water outlet pipe (32). A collection device (20) is used to collect water vapor and detect it; The cooling module includes multiple parallel cooling units (40). Each cooling unit (40) includes multiple coolers (41), a cooling flow path (42), a main water sample flow path (43), a bypass water sample flow path (44), and a water sample outflow path (45). The cooling flow path (42) is connected between the demineralized water outlet pipe (32) and the demineralized water inlet pipe (31) and passes through the multiple coolers (41) in sequence. The main water sample path (43) is connected between the water vapor sampling port and the water sample outlet path (45) and passes through multiple coolers (41) in sequence. The water sample outlet path (45) is adapted to communicate with the collection device (20). One end of the water sample bypass path (44) is adapted to communicate with the outlet end of the main water sample path (43), and the other end of the water sample bypass path (44) is adapted to communicate with the main water sample path (43) upstream of one of the coolers (41). The outlet end of the main water sample channel (43) is provided with a first temperature transmitter (433). The demineralized water pump (33) and the first temperature transmitter (433) are both electrically connected to the control system (10). The control system (10) is adapted to control the flow rate of the demineralized water outlet pipeline (32) and the connection status between the water sample bypass channel (44) and the main water sample channel (43) according to the water sample temperature at the outlet end of the main water sample channel (43).

2. The generator set water vapor sampling system (100) according to claim 1, characterized in that, A first three-way valve (431) is connected in series on the main water flow path (43) upstream of one of the coolers (41) in the cooling unit (40). The outlet end of the main water flow path (43) is connected to the water flow outlet path (45) through a second three-way valve (432). The water flow bypass path (44) is connected between the first three-way valve (431) and the second three-way valve (432). Both the first three-way valve (431) and the second three-way valve (432) are electrically connected to the control system (10).

3. The generator set water vapor sampling system (100) according to claim 1, characterized in that, A pressure reducing valve (451) is also connected in series on the water sample outlet (45), and a first pressure transmitter (452) is also provided at the outlet end of the water sample outlet (45). The control system (10) is adapted to control the opening degree of the pressure reducing valve (451) according to the water vapor pressure flowing out of the water sample outlet (45).

4. The generator set water vapor sampling system (100) according to claim 1, characterized in that, The demineralized water outlet pipeline (32) includes a first branch (321) and a second branch (322). The first branch (321) and the second branch (322) are connected in parallel and between the demineralized water tank (30) and the cooling flow path (42). A first demineralized water pump (331) is connected in series on the first branch (321), and a second demineralized water pump (332) is connected in series on the second branch (322). Both the first demineralized water pump (331) and the second demineralized water pump (332) are electrically connected to the control system (10).

5. The generator set water vapor sampling system (100) according to claim 4, characterized in that, The outlet end of the demineralized water outlet pipeline (32) is provided with a second temperature transmitter (323), a first flow transmitter (324), and a second pressure transmitter (325). The second temperature transmitter (323), the first flow transmitter (324), and the second pressure transmitter (325) are all electrically connected to the control system (10). The control system (10) is adapted to control the flow state in the demineralized water outlet pipeline (32) according to the outlet water temperature, flow rate, and pressure of the demineralized water outlet pipeline (32).

6. The generator set water vapor sampling system (100) according to claim 1, characterized in that, The demineralized water outlet pipeline (32) is also equipped with an online conductivity meter (326), which is electrically connected to the control system (10); The demineralized water tank (30) is also equipped with a drain valve (35) and an inlet valve (34). The inlet valve (34) is adapted to be connected to an external water circuit. Both the drain valve (35) and the inlet valve (34) are electrically connected to the control system (10). The control system (10) is adapted to control the opening and closing states of the drain valve (35) and the inlet valve (34) according to the conductivity of the demineralized water in the demineralized water outlet pipe (32).

7. The generator set water vapor sampling system (100) according to claim 6, characterized in that, The demineralized water tank is equipped with a level controller, which is electrically connected to the control system. The control system is adapted to control the opening degree of the drain valve according to the level of the demineralized water tank.

8. The generator set water vapor sampling system (100) according to claim 6, characterized in that, The demineralized water tank (30) is also equipped with an inlet bypass valve, which is suitable for connecting to an external water circuit.

9. The generator set water vapor sampling system (100) according to claim 1, characterized in that, Also includes: The water-cooled flow path (50) is connected to the demineralized water outlet pipe (32) via a heat exchanger (60).

10. The generator set water vapor sampling system (100) according to claim 9, characterized in that, The inlet end of the water-cooled flow path (50) is provided with a third temperature transmitter (51), a second flow transmitter (52) and a third pressure transmitter (53), and the third temperature transmitter (51), the second flow transmitter (52) and the third pressure transmitter (53) are all electrically connected to the control system (10).

11. The generator set water vapor sampling system (100) according to claim 9, characterized in that, The water flow parameters at the inlet of the water-cooled flow path (50) meet the following requirements: water temperature less than or equal to 30℃, flow rate less than 50t / h, and pressure greater than or equal to 0.2Mpa and less than or equal to 0.7Mpa.

12. A method for controlling water vapor sampling, characterized in that, The water vapor sampling control method, applied to the generator set water vapor sampling system (100) according to any one of claims 1-11, comprises: S1, Obtain the water sample outflow temperature t1 from the water sample outflow path (45); S2, compare t1 with the first set temperature T1. If t1 < T1, then the bypass path (44) and the main flow path (43) of the water sample are disconnected, and the main flow path (43) of the water sample is connected to the collection device (20). If t1≥T1, then connect both ends of the water sample bypass path (44) to the water sample main path (43) respectively, disconnect the water sample main path (43) from the collection device (20), control the demineralized water pump (33) to increase the flow rate in the demineralized water outlet pipe (32), and repeat step S1.

13. The water vapor sampling and control method according to claim 12, characterized in that, Before the main water sample flow path (43) is connected to the collection device (20), the following is also included: S21. Obtain the water sample pressure P at the outlet end of the water sample outlet (45). 水样 ; S22, Comparison water sample pressure P 水样 Compared with the first set pressure P1 and the second set pressure P2, P1 is less than P2. If P 水样 If P1 < P1, then reduce the opening of the pressure reducing valve (451) until P1 < P2 ... 水样 Satisfy: P1≤P 水样 ≤P2, control the main water sample flow path (43) to connect with the collection device (20), If P 水样 If the value is greater than P2, then increase the opening of the pressure reducing valve (451) until P2 is reached. 水样 Satisfy: P1≤P 水样 ≤P2, control the main water sample flow path (43) to connect with the collection device (20), If P 水样 Satisfy: P1≤P 水样 If ≤P2, then the opening of the pressure reducing valve (451) remains unchanged, and the main water sample flow path (43) is connected to the collection device (20).

14. The water vapor sampling and control method according to claim 12, characterized in that, The demineralized water outlet pipeline (32) includes a first branch (321) and a second branch (322). A first demineralized water pump (331) is connected in series on the first branch (321), and a second demineralized water pump (332) is connected in series on the second branch (322). Between step S1 and step S2, the following is also included: S11. Control the first demineralized water pump (331) to enter the working state; S12. Obtain the temperature t2, flow rate Q, and pressure P of the water emanating from the demineralized water outlet pipe (32). 除盐 ; S13, for t2, Q and P 除盐 Make a judgment: If the water outlet of the demineralized water outlet pipe (32) satisfies: t2≤second set temperature T2 and Q≥set flow rate Q1 and P 除盐 When the third set pressure P3 is reached, the first demineralized water pump (331) is controlled to maintain its working state, and the second demineralized water pump (332) is controlled to stop working, proceeding to step S2. If the water outlet of the demineralized water outlet pipe (32) satisfies: t2>T2 or Q<Q1 or P 除盐 When P < P3, control the first demineralized water pump (331) to increase its operating frequency until the water output from the demineralized water outlet pipe (32) satisfies: t2≤T2 and Q≥Q1 and P 除盐 ≥P3, proceed to step S2. If the power of the first demineralized water pump (331) reaches its maximum value, it still cannot satisfy: t2≤T2 and Q≥Q1 and P 除盐 If ≥P3, then control the second demineralized water pump (332) to work, and adjust the frequency of the second demineralized water pump (332) according to the above parameters until the following conditions are met: t2≤T2 and Q≥Q1 and P 除盐 If ≥P3, proceed to step S2.

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