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

Abstract

The invention 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, the generator set is provided with a control system, a demineralized water tank and a plurality of water vapor sampling ports, and the demineralized water tank is connected with a demineralized water inlet pipeline and a demineralized water outlet pipeline; the desalted water outlet pipeline is connected in series with a desalted water pump; a collection device; the cooling module comprises a plurality of cooling units which are connected in parallel, each cooling unit comprises a plurality of coolers, a cooling flow path, a water sample main flow path, a water sample bypass flow path and a water sample outflow path, and a first temperature transmitter is arranged at the outlet end of each water sample outflow path; the control system is suitable for controlling the flow of the desalted water outlet pipeline and the circulation state of the water sample bypass flow path and the water sample main flow path according to the temperature of the outlet end of the water sample outflow path. According to the water vapor sampling system of the generator set, the temperature of the water sample can be automatically adjusted, so that the water vapor sampling difficulty of the generator set can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of generator sets, and in particular to a water vapor sampling system and a water vapor sampling control method for a generator set. Background Art

[0002] Water vapor quality monitoring is a crucial tool for ensuring the safe and economical operation of power plants. Ultra-supercritical units typically operate at steam temperatures exceeding 600°C and pressures exceeding 35 MPa. High-temperature, high-pressure samples cannot meet water vapor monitoring requirements. During unit operation, power plants monitor water vapor quality using a combination of laboratory manual sampling and analysis and online chemical instrument monitoring. To meet sampling requirements and ensure personnel safety, the steam-water sampling system processes water vapor samples into samples at room temperature and pressure to accommodate manual sampling and continuous monitoring by online chemical instruments. Power plants are typically equipped with centralized steam-water sampling devices, primarily consisting of closed-loop desalted water cooling units, intelligent cooling and pressure reduction racks, and low-temperature instrument panels. These devices cool and reduce the pressure of water samples entering the low-temperature instrument panels, ensuring the safety of manual sampling and reliable monitoring of online instruments. In related technologies, operators must manually adjust the desalted water cooling unit to adjust the water vapor sampling temperature, making water vapor sampling difficult. Summary of the Invention

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

[0004] The present invention also provides a water vapor sampling control method applied to the water vapor sampling system of the generator set.

[0005] According to the first aspect of the present invention, the water vapor sampling system of the generator set comprises: a generator set, the generator set having a control system, a desalted water tank and a plurality of water vapor sampling ports, the desalted water tank being connected to a desalted water inlet pipeline and a desalted water outlet pipeline, the desalted water outlet pipeline being connected in series with a desalted water pump; a collection device, the collection device being used to collect water vapor and perform detection; a cooling module, the cooling module comprising a plurality of parallel cooling units, the cooling unit comprising a plurality of coolers, a cooling flow path, a water sample main flow path, a water sample side flow path and a water sample outflow path, the cooling flow path being connected between the desalted water outlet pipeline and the desalted water inlet pipeline and being sequentially passed through the plurality of coolers, the water sample The main flow path is connected between the water vapor sampling port and the water sample outflow path and is sequentially arranged in multiple coolers. The water sample outflow path is suitable for communicating with the collection device. One end of the water sample bypass flow path is suitable for communicating with the outlet end of the water sample main flow path. The other end of the water sample bypass flow path is suitable for communicating with the water sample main flow path upstream of one of the coolers. A first temperature transmitter is provided at the outlet end of the water sample main flow path. The desalted water pump and the first temperature transmitter are both electrically connected to the control system. The control system is suitable for controlling the flow rate of the desalted water outlet pipeline and the connectivity between the water sample bypass flow path and the water sample main flow path according to the water sample temperature at the outlet end of the water sample main 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 desalted water outlet pipeline and the connectivity status of the water sample bypass flow path and the water sample main flow path according to the water sample temperature at the outlet end of the water sample main flow path, thereby realizing automatic adjustment of the water sample temperature, thereby 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 to the main water sample path upstream of one of the coolers in the cooling unit, the outlet end of the main water sample 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 the first three-way valve and the second three-way valve are both electrically connected to the control system.

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

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

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

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

[0012] According to some embodiments of the present invention, a liquid level controller is provided in the desalted water tank, and the liquid level controller is electrically connected to the control system. The control system is suitable for controlling the opening of the drain valve according to the liquid level in the desalted water tank.

[0013] According to some embodiments of the present invention, the desalted water tank is further provided with a water inlet bypass valve, and the water inlet bypass valve is suitable for communicating with an external water circuit.

[0014] According to some embodiments of the present invention, the generator set water vapor sampling system further includes: a water cooling 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, a third temperature transmitter, a second flow transmitter and a third pressure transmitter are provided at the inlet end of the water-cooling flow path, 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 end of the water-cooling flow path meet the following requirements: water temperature is less than or equal to 30° C., flow rate is less than 50 t / h, and pressure is greater than or equal to 0.2 MPa and less than or equal to 0.7 MPa.

[0017] The water vapor sampling control method according to the second aspect of the present invention is applied to the water vapor sampling system of the generator set according to the first aspect of the present invention, and 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 the first set temperature T1, if t1<T1, then controlling the water sample bypass flow path and the water sample main flow path to be disconnected, and controlling the water sample main flow path to be connected to the collection device; if t1≥T1, then controlling the two ends of the water sample bypass flow path to be connected to the water sample main flow path respectively, controlling the water sample main flow path to be disconnected from the collection device, controlling the desalted water pump to increase the flow rate in the desalted 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 controlling the water sample main flow path to be connected with the collection device, the process further includes: S21, obtaining the water sample pressure P at the outlet of the water sample flow path; 水样 ; S22, comparison of water sample pressure P 水样 With the first set pressure P1 and the second set pressure P2, P1 is less than P2, if P 水样 <P1, then reduce the opening of the pressure reducing valve until P 水样 Satisfies: P1≤P 水样 ≤P2, control the main flow of water sample to be connected with the collection device, if P 水样 > P2, then increase the opening of the pressure reducing valve until P 水样 Satisfies: P1≤P 水样 ≤P2, control the main flow of water sample to be connected with the collection device, if P 水样 Satisfies: P1≤P 水样 ≤P2, the opening of the pressure reducing valve is controlled to remain unchanged, and the main flow path of the water sample is controlled to be connected with the collection device.

[0020] According to some embodiments of the present invention, the desalted water outlet pipeline includes a first branch and a second branch, the first branch is connected in series with a first desalted water pump, and the second branch is connected in series with a second desalted water pump, and between the step S1 and the step S2, the following steps are further included: S11, controlling the first desalted water pump to enter a working state; S12, obtaining the temperature t2, flow rate Q and pressure P of the water outlet of the desalted water outlet pipeline 除盐 ; S13, t2, Q and P 除盐 Make a judgment: If the water outlet of the desalted water outlet pipe meets the following conditions: t2≤the second set temperature T2 and Q≥the set flow Q1 and P 除盐 ≥ the third set pressure P3, control the first desalted water pump to maintain the working state, control the second desalted water pump to stop working, enter step S2, if the water outlet of the desalted water outlet pipe meets: t2>T2 or Q<Q1 or P 除盐When P<P3, the first desalted water pump is controlled to increase the operating frequency until the water outlet of the desalted water outlet pipeline meets the following conditions: t2≤T2 and Q≥Q1 and P 除盐 ≥P3, go to step S2, if the power of the first desalted water pump reaches the maximum value and still cannot meet the following conditions: t2≤T2 and Q≥Q1 and P 除盐 ≥P3, the second desalted water pump is controlled to work, and the frequency of the second desalted water pump is adjusted according to the above parameters until the following conditions are met: t2≤T2 and Q≥Q1 and P 除盐 ≥P3, go to step S2.

[0021] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0025] Figure 4 is a flow chart of a water vapor sampling control method according to yet another embodiment of the present invention.

[0026] Reference numerals:

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

[0028] 10. Control system;

[0029] 20. Collection device;

[0030] 30. Desalted water tank; 31. Desalted water inlet pipe; 32. Desalted water outlet pipe; 321. First branch pipe; 322. Second branch pipe; 323. Second temperature transmitter; 324. First flow transmitter; 325. Second pressure transmitter; 326. Online conductivity meter; 33. Desalted water pump; 331. First desalted water pump; 332. Second desalted 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. Water sample main flow path; 431. First three-way valve; 432. Second three-way valve; 433. First temperature transmitter; 44. Water sample bypass flow path; 45. Water sample outflow path; 451. Pressure reducing valve; 452. First pressure transmitter;

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

[0033] 60. Heat exchanger. DETAILED DESCRIPTION

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

[0035] Reference below Figure 1-Figure 4 The water vapor sampling system 100 for a generator set according to a first embodiment of the present invention is described.

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

[0037] Specifically, the generator set includes a desalted water tank 30 and multiple water vapor sampling ports. The desalted water tank 30 is connected to a desalted water inlet pipe 31 and a desalted water outlet pipe 32. The desalted water outlet pipe 32 is connected in series with a desalted water pump 33. The collection 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 a plurality of coolers 41, a cooling flow path 42, a water sample main flow path 43, a water sample side flow path 44 and a water sample outflow path 45. For example, the coolers 41 can be two, three or four. The cooling flow path 42 is connected between the desalted water outlet pipe 32 and the desalted water inlet pipe 31 and is sequentially arranged through the plurality of coolers 41. The water sample main flow path 43 is connected between the water vapor sampling port and the water sample outflow path 45 and is sequentially arranged through the plurality of coolers 41. The water sample outflow path 45 is suitable for communicating with the collection device 20. The water sample side flow path One end of 44 is suitable for being connected with the outlet end of the water sample main flow path 43, and the other end of the water sample bypass flow path 44 is suitable for being connected with the water sample main flow path 43 upstream of one of the coolers 41. The outlet end of the water sample main flow path 43 is provided with a first temperature transmitter 433. The desalted water pump 33 and the first temperature transmitter 433 are both electrically connected to the control system 10. The control system 10 is suitable for controlling the flow rate of the desalted water outlet pipeline 32 and the circulation state between the water sample bypass flow path 44 and the water sample main flow path 43 according to the water sample temperature at the outlet end of the water sample main flow path 43.

[0039] The collection device 20 includes both manual collection equipment and online equipment for automatic collection 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 location through which the water sample main flow path 43 flows. Preferably, the other end of the water sample bypass flow path 44 is adapted to communicate with the water sample main flow path 43 upstream of the high-efficiency cooler 412, which is the first point through which the water sample main flow path 43 flows. The water vapor sampling port can flow out feed water 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 water sample main flow path 43, then passes through multiple coolers 41 in sequence and flows out from the outlet end of the water sample outflow path 45. At the same time, the desalted water pump 33 drives the desalted water in the desalted water tank 30 to flow in the loop formed by the desalted water outlet pipe 32, the cooling flow path 42 and the desalted water inlet pipe 31. The desalted water exchanges heat with the water sample in the cooler 41. The first temperature transmitter 433 detects the temperature of the water sample flowing out of the water sample main flow path 43, and the control system 10 determines the water sample temperature as follows:

[0041] When the water sample temperature at the outlet end of the water sample main flow path 43 is lower than 40°C, the control system 10 determines that the water sample temperature meets the sampling requirements, and the control system 10 controls the water sample side flow path 44 to be disconnected from the water sample main flow path 43. The operator connects the water sample outflow path 45 with 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 end of the water sample main flow 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, and one end of the water sample bypass flow path 44 is connected to the outlet end of the water sample outflow path 45, and the other end of the water sample bypass flow path 44 is connected to the water sample main flow path 43 on the upstream side of the high-efficiency cooler 412 that the water sample main flow path 43 first flows through. Part of the water vapor in the water sample outflow path 45 flows directly out to the outside, and the other part passes through the high-efficiency cooler 412 through the water sample bypass flow path 44 for secondary cooling. At the same time, the control system 10 controls the desalted water pump 33 to increase the flow rate of the desalted water outlet pipe 32. Thus, part of the water sample participates in multiple cycles of cooling, which can reduce the waste of water samples, and the increase in the flow rate of the desalted water outlet pipe 32 can increase the flow rate of desalted water in the cooler 41, thereby increasing the heat exchange efficiency of water vapor.

[0043] The control system 10 is provided with a set flow rate increase step. After the flow rate in the desalted water outlet pipe 32 increases, the desalted water circulation is maintained for a set time. When 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 is continued until the water sample temperature is lower than 40°C. The water sample temperature can only be lowered below 40°C after the number and power of the desalted water pumps 33 in the working state have reached the maximum value. If the water sample temperature cannot be lowered below 40°C, it is determined that the power of the desalted water pump 33 cannot meet the working requirements and it is necessary to replace the desalted water pump 33 with a higher power and the corresponding pipeline.

[0044] When the water sample temperature is lower than 40° C., the control system 10 controls the water sample bypass flow path 44 to be disconnected from the water sample main flow path 43 , and the collection device 20 collects the water sample normally.

[0045] In this way, automatic adjustment of the water sample temperature can be achieved.

[0046] The generator set water vapor sampling system 100 may be provided with relevant components to automatically control the water sample outflow path 45 to be connected to the collection device 20 , or an operator may manually connect the water sample outflow path 45 to the collection device 20 .

[0047] According to the generator set water vapor sampling system 100 of the first embodiment of the present invention, the control system 10 controls the flow rate of the desalted water outlet pipeline 32 and the connectivity status of the water sample bypass flow path 44 and the water sample main flow path 43 according to the water sample temperature at the outlet end of the water sample main flow path 43, thereby realizing automatic adjustment of the water sample temperature, thereby reducing the difficulty of water vapor sampling.

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

[0049] Among them, 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 water sample main flow path 43, and the third interface is connected to the water sample bypass flow 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 water sample main flow path 43 and the water sample outflow path 45 respectively, and the sixth interface is connected to the water sample bypass flow path 44.

[0050] When the water sample temperature at the outlet end of the water sample main channel 43 is lower than 40°C, the control system 10 controls the first interface and the second interface to be connected, and the third interface to be disconnected from the first interface and the second interface; the control system 10 controls the fourth interface and the fifth interface to be connected, and the sixth interface to be disconnected from the fourth interface and the fifth interface.

[0051] When the water sample temperature at the outlet end of the water sample main flow path 43 is greater than or equal to 40°C, the control system 10 controls the first interface, the second interface and the third interface to be connected, and the control system 10 controls the fourth interface, the fifth interface and the sixth interface to be connected, so that the water sample bypass flow path 44 and the water sample main flow path 43 can be connected.

[0052] In this way, the control system 10 can control the communication state between the water sample bypass flow path 44 and the water sample main flow path 43.

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

[0054] Among them, the first pressure transmitter 452 is used to detect the water vapor pressure flowing out of the water sample outflow path 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] In this way, the water sample pressure can be automatically adjusted, thereby further reducing the difficulty of water vapor sampling.

[0056] It is understandable 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, Figure 1 As shown, the desalted 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 connected between the desalted water tank 30 and the cooling flow path 42. The first branch 321 is connected in series with a first desalted water pump 331, and the second branch 322 is connected in series with a second desalted water pump 332. The first desalted water pump 331 and the second desalted water pump 332 are both electrically connected to the control system 10.

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

[0059] In some embodiments of the present invention, Figure 1 As shown, the outlet end of the desalted 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 suitable for controlling the flow state in the desalted water outlet pipeline 32 according to the outlet water temperature, flow rate and pressure of the desalted water outlet pipeline 32.

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

[0061] When the temperature is lower than 35° C., the flow rate is higher than 20 t / h, and the water pressure is higher than 0.4 MPa, the first desalted water pump 331 on the first branch 321 is controlled to be in working state.

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

[0063] In this way, the temperature, flow rate and water pressure of the desalted water outlet pipe 32 can be automatically adjusted, thereby further reducing the difficulty of sampling.

[0064] In some embodiments of the present invention, Figure 1 As shown, the desalted water outlet pipe 32 is also provided with an online conductivity meter 326, which is electrically connected to the control system 10. The desalted water tank 30 is also provided with a drain valve 35 and a water inlet valve 34, and the water inlet valve 34 is suitable for communicating with an external water channel. The drain valve 35 and the water inlet valve 34 are both electrically connected to the control system 10, and the control system 10 is suitable for controlling the opening and closing states of the drain valve 35 and the water inlet valve 34 according to the conductivity of the desalted water in the desalted 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 desalted water in the desalted 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 water inlet valve 34 and the water outlet valve 35 are controlled to open, and the desalted water in the external waterway enters the desalted water tank 30 to replace the desalted water until the conductivity drops to 1 μS / cm or below.

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

[0068] In this way, the conductivity of the desalted water can be automatically adjusted.

[0069] If the electrical conductivity cannot be reduced to 1 μS / cm, the heat exchanger 60 and other components are inspected to confirm whether they are damaged.

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

[0071] The liquid level controller detects the liquid level in the desalted water tank 30. When the liquid level in the desalted water tank 30 exceeds the maximum liquid level, the desalted water flows out of the overflow tank. At the same time, the control system 10 reduces the opening of the water inlet valve 34. In this way, the liquid level in the desalted water tank 30 can be automatically controlled.

[0072] In some embodiments of the present invention, Figure 1 As shown, the desalted water tank 30 is further provided with an inlet bypass valve 36, which is adapted to communicate with an external waterway. If the flow rate of the line 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 the desalted water tank 30 through the waterway connected to the inlet bypass valve 36. The inlet bypass valve 36 can be opened and closed manually or controlled by the control system 10.

[0073] In some embodiments of the present invention, Figure 1 As shown, the generator set water vapor sampling system 100 further includes: a water cooling flow path 50 , which is connected to the demineralized water outlet pipeline 32 for heat exchange via a heat exchanger 60 .

[0074] The water cooling flow path 50 is connected to the external water path. By setting up the water cooling flow path 50, the water cooling flow path 50 can exchange heat with the desalted water outlet pipeline 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, there are two heat exchangers 60, the water cooling flow path 50 includes two water cooling branches, the cooling flow path 42 includes two cooling branches, and the water cooling branches, heat exchangers 60 and cooling branches correspond one to one.

[0076] When the generator set water vapor sampling system 100 starts working, the desalted water outlet pipe 32 and the water cooling flow path 50 are connected together. In this way, the pressure in the heat exchanger 60 can be evenly distributed, reducing the probability of damage to the heat exchanger 60. When the generator set water vapor sampling system 100 finishes working, the desalted water outlet pipe 32 is cut off first, and then the water cooling flow path 50 is cut off. In this way, it can be ensured that the desalted water outlet pipe 32 is cooled by cooling water during its circulation process.

[0077] In some embodiments of the present invention, Figure 1 As shown, a third temperature transmitter 51 , a second flow transmitter 52 and a third pressure transmitter 53 are provided at the inlet end of the water-cooling flow path 50 , 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 .

[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 of the water flowing into the water-cooling 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 be displayed to the operator so that the operator knows the status of the water-cooling flow path 50 and then processes it. On the other hand, it can be linked with other control components to control the flow state of the water-cooling flow path 50.

[0079] In some embodiments of the present invention, the water flow parameters at the inlet of the water-cooling flow path 50 meet the following requirements: water temperature ≤ 30°C, flow rate ≤ 50 t / h, and pressure ≥ 0.2 MPa and ≤ 0.7 MPa. This ensures that the cooling water parameters within the water-cooling flow path 50 meet the operating requirements of the generator set water vapor sampling system 100.

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

[0081] S1 . Obtain the outflow temperature t1 of the water sample in the main water sample path 43 .

[0082] The temperature of the water sample flowing out of the water sample main flow path 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 obtains the water sample outflow temperature t1 .

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

[0084] If t1<T1, the water sample bypass flow path 44 is controlled to be disconnected from the water sample main flow path 43, and the water sample main flow path 43 is controlled to be 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 flow path 44 to be disconnected from the water sample main flow path 43 through the first three-way valve 431 and the second three-way valve 432. The water sample main flow 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 with the collection device 20. The water sample main flow path 43 is connected to the collection device 20 through the water sample outflow path 45, and 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, the two ends of the water sample bypass path 44 are controlled to be connected to the water sample main path 43 respectively, the water sample main path 43 is controlled to be disconnected from the collection device 20, the desalted water pump 33 is controlled to increase the flow in the desalted water outlet pipe 32, and step S1 is repeated.

[0088] At this time, the control system 10 determines that the water sample temperature is higher than the sampling requirement, and 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 end of the water sample outflow path 45 through the second three-way valve 432, and the other end of the water sample bypass path 44 is connected to the water sample main path 43 on the upstream side of the first high-efficiency cooler 412 through which the water sample main path 43 flows through through the first three-way valve 431. Part of the water vapor in the water sample outflow path 45 flows directly out to the outside, and the other part passes through the water sample bypass path 44 and is cooled secondary by the high-efficiency cooler 412. At the same time, the control system 10 controls the desalted water pump 33 to increase the flow rate of the desalted water outlet pipeline 32. As a result, part of the water sample participates in multiple cycles of cooling, which can reduce the waste of water samples, and the increase in the flow rate of the desalted water outlet pipeline 32 can increase the flow rate of the cooling flow in the cooler 41, thereby increasing the cooling efficiency of the water sample.

[0089] The control system 10 is provided with a set flow rate increase step. After the flow rate in the desalted water outlet pipe 32 increases, the desalted water circulation is maintained for a set time. When 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 is continued until the water sample temperature is lower than 40°C. The water sample temperature can be lowered below 40°C only when the number and power of the desalted water pump 33 in the working state are both at the maximum value. If the water sample temperature cannot be lowered below 40°C, it is determined that the power of the desalted water pump 33 is insufficient for operation and a higher-power desalted water pump 33 and a corresponding pipe need to be replaced.

[0090] When the water sample temperature is lower than 40° C., the control system 10 controls the water sample bypass flow path 44 to be disconnected from the water sample main flow path 43 , and the collection device 20 collects the water sample normally.

[0091] In some embodiments of the present invention, Figure 3 As shown, before controlling the water sample main channel 43 to be connected to the collection device 20, the following steps are also included:

[0092] S21, obtaining the water sample pressure P at the outlet of the water sample outlet 45 水样 .

[0093] The first pressure transmitter 452 detects the water sample pressure at the outlet of the water sample outflow path 45, and transmits the water sample pressure data to the control system 10, so that the control system 10 obtains the water sample pressure P 水样 .

[0094] S22, comparison of water sample pressure P 水样With the first set pressure P1 and the second set pressure P2, P1 is less than P2,

[0095] If P 水样 <P1, then reduce the opening of the pressure reducing valve 451 until P 水样 Satisfies: P1≤P 水样 ≤P2, control the water sample main channel 43 to be connected with the collection device 20,

[0096] If P 水样 > P2, then increase the opening of the pressure reducing valve 451 until P 水样 Satisfies: P1≤P 水样 ≤P2, control the water sample main channel (43) to be connected with the collection device (20),

[0097] If P 水样 Satisfies: P1≤P 水样 ≤P2, the opening of the pressure reducing valve 451 is controlled to remain unchanged, and the water sample main flow path 43 is controlled to be 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 an appropriate 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 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 desalted water outlet pipe 32 includes a first branch 321 and a second branch 322. The first branch 321 is connected in series with a first desalted water pump 331, and the second branch 322 is connected in series with a second desalted water pump 332. Figure 4 As shown, between step S1 and step S2, the following steps are also included:

[0101] S11, controlling the first desalted water pump 331 to enter a working state;

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

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

[0104] The second temperature transmitter 323 obtains the temperature t2 in the desalted water outlet pipe 32 on the downstream side of the heat exchanger 60, the first flow transmitter 324 obtains the flow rate Q in the desalted water outlet pipe 32 on the downstream side of the heat exchanger 60, and the second pressure transmitter 325 obtains the water flow pressure P in the desalted water outlet pipe 32 on the downstream side 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 desalted water outlet pipe 32 satisfies: t2≤the second set temperature T2 and Q≥the set flow rate Q1 and P 除盐 When the pressure is greater than or equal to the third set pressure P3, the first desalted water pump 331 is controlled to maintain the working state, and the second desalted water pump 332 is controlled to stop working, and the process goes to step S2.

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

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

[0109] If the power of the first desalted water pump 331 reaches the maximum value and still cannot meet the following conditions: t2≤T2 and Q≥Q1 and P 除盐 ≥P3, the second desalted water pump 332 is controlled to work, and the frequency of the second desalted water pump 332 is adjusted according to the above parameters until the following conditions are met: t2≤T2 and Q≥Q1 and P 除盐 ≥P3, go to step S2.

[0110] At this time, it is determined that the outlet parameters of the desalted water outlet pipeline 32 cannot meet the working requirements of the water vapor sampling system 100 of the generator set. The outlet parameters of the desalted water outlet pipeline 32 are adjusted by the first desalted water pump 331 and the second desalted water pump 332 under different conditions, thereby increasing the adjustment range of the outlet parameters of the desalted water outlet pipeline 32.

[0111] Preferably, t2 is 35°C, Q is 20t / h, P 除盐 It is 0.4Mpa.

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

[0113] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present 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 the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0115] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0116] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0117] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A water vapor sampling system (100) for a generator set, characterized in that: include: A generator set comprising a control system (10), a desalted water tank (30) and a plurality of water vapor sampling ports, wherein the desalted water tank (30) is connected to a desalted water inlet pipe (31) and a desalted water outlet pipe (32), and the desalted water outlet pipe (32) is connected in series with a desalted water pump (33); A collection device (20), the collection device (20) is used to collect water vapor and perform detection; A cooling module, the cooling module comprising a plurality of parallel cooling units (40), the cooling unit (40) comprising a plurality of coolers (41), a cooling flow path (42), a water sample main flow path (43), a water sample side flow path (44) and a water sample outflow path (45), the cooling flow path (42) being connected between the demineralized water outlet pipeline (32) and the demineralized water inlet pipeline (31) and being sequentially arranged through the plurality of coolers (41), The water sample main flow path (43) is connected between the water vapor sampling port and the water sample outflow path (45) and is sequentially arranged through the plurality of coolers (41). The water sample outflow path (45) is suitable for communicating with the collection device (20). One end of the water sample bypass flow path (44) is suitable for communicating with the outlet end of the water sample main flow path (43), and the other end of the water sample bypass flow path (44) is suitable for communicating with the water sample main flow path (43) upstream of one of the coolers (41). A first temperature transmitter (433) is provided at the outlet end of the water sample main flow path (43), and the desalted 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 desalted water outlet pipeline (32) and the connection state between the water sample bypass flow path (44) and the water sample main flow path (43) according to the water sample temperature at the outlet end of the water sample main flow path (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 to the water sample main flow path (43) upstream of one of the coolers (41) in the cooling unit (40); the outlet end of the water sample main flow path (43) is connected to the water sample outflow path (45) via a second three-way valve (432); the water sample bypass flow path (44) is connected between the first three-way valve (431) and the second three-way valve (432); and the first three-way valve (431) and the second three-way valve (432) are both 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 to the water sample outflow path (45), and a first pressure transmitter (452) is also provided at the outlet end of the water sample outflow path (45). The control system (10) is suitable for controlling the opening of the pressure reducing valve (451) according to the water vapor pressure flowing out of the water sample outflow path (45).

4. The generator set water vapor sampling system (100) according to claim 1, characterized in that: The desalted water outlet pipeline (32) comprises 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 desalted water tank (30) and the cooling flow path (42); a first desalted water pump (331) is connected in series to the first branch (321); a second desalted water pump (332) is connected in series to the second branch (322); and both the first desalted water pump (331) and the second desalted 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 desalted 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); and the control system (10) is suitable for controlling the flow state in the desalted water outlet pipeline (32) according to the outlet water temperature, flow rate and pressure of the desalted water outlet pipeline (32).

6. The generator set water vapor sampling system (100) according to claim 1, characterized in that: An online conductivity meter (326) is also provided on the demineralized water outlet pipeline (32), and the online conductivity meter (326) is electrically connected to the control system (10); The desalted water tank (30) is further provided with a drain valve (35) and a water inlet valve (34). The water inlet valve (34) is adapted to be in communication with an external waterway. The drain valve (35) and the water inlet valve (34) are both 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 water inlet valve (34) according to the conductivity of the desalted water in the desalted water outlet pipe (32).

7. The generator set water vapor sampling system (100) according to claim 6, characterized in that: A liquid level controller is provided in the desalted water tank, and the liquid level controller is electrically connected to the control system. The control system is suitable for controlling the opening of the drain valve according to the liquid level in the desalted water tank.

8. The generator set water vapor sampling system (100) according to claim 6, characterized in that: The desalted water tank (30) is further provided with a water inlet bypass valve, which is suitable for communicating with an external waterway.

9. The generator set water vapor sampling system (100) according to claim 1, characterized in that: Also includes: A water-cooling flow path (50) is connected to the demineralized water outlet pipeline (32) for heat exchange 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-cooling flow path (50) is provided with a third temperature transmitter (51), a second flow transmitter (52) and a third pressure transmitter (53); 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 end of the water-cooling flow path (50) meet the following requirements: water temperature is less than or equal to 30°C, flow rate is less than 50 t / h, and pressure is greater than or equal to 0.2 MPa and less than or equal to 0.7 MPa.

12. A water vapor sampling control method, characterized in that: Applied to the generator set water vapor sampling system (100) according to any one of claims 1 to 11, the water vapor sampling control method comprises: S1, obtaining the water sample outflow temperature t1 of the water sample outflow path (45); S2, compare t1 with the first set temperature T1, If t1 < T1, the water sample bypass path (44) is controlled to be disconnected from the water sample main path (43), and the water sample main path (43) is controlled to be connected to the collection device (20). If t1≥T1, the two ends of the water sample bypass path (44) are controlled to be connected to the water sample main path (43) respectively, the water sample main path (43) is controlled to be disconnected from the collection device (20), the desalted water pump (33) is controlled to increase the flow rate in the desalted water outlet pipe (32), and step S1 is repeated.

13. The water vapor sampling control method according to claim 12, characterized in that: Before the control water sample main flow path (43) is connected to the collection device (20), the method further includes: S21, obtaining the water sample pressure P at the outlet of the water sample outlet (45) 水样 ; S22, comparison of water sample pressure P 水样 With the first set pressure P1 and the second set pressure P2, P1 is less than P2, If P 水样 <P1, then reduce the opening of the pressure reducing valve (451) until P 水样 Satisfies: P1≤P 水样 ≤P2, control the water sample main channel (43) to be connected with the collection device (20), If P 水样 > P2, then increase the opening of the pressure reducing valve (451) until P 水样 Satisfies: P1≤P 水样 ≤P2, control the water sample main channel (43) to be connected with the collection device (20), If P 水样 Satisfies: P1≤P 水样 ≤P2, the opening of the pressure reducing valve (451) is controlled to remain unchanged, and the main flow path (43) of the water sample is controlled to be connected with the collection device (20).

14. The water vapor sampling control method according to claim 12, characterized in that: The desalted water outlet pipeline (32) includes a first branch (321) and a second branch (322), the first branch (321) is connected in series with a first desalted water pump (331), and the second branch (322) is connected in series with a second desalted water pump (332), and further includes between step S1 and step S2: S11, controlling the first desalted water pump (331) to enter a working state; S12, obtaining the temperature t2, flow rate Q and pressure P of the water outlet from the desalted water outlet pipeline (32) 除盐 ; S13, for t2, Q and P 除盐 Make a judgment: If the outlet water of the desalted water outlet pipe (32) satisfies: t2≤the second set temperature T2 and Q≥the set flow rate Q1 and P 除盐 ≥ the third set pressure P3, the first desalted water pump (331) is controlled to maintain the working state, and the second desalted water pump (332) is controlled to stop working, and the process goes to step S2. If the water outlet of the desalted water outlet pipe (32) satisfies: t2>T2 or Q<Q1 or P 除盐 When < P3, the first desalted water pump (331) is controlled to increase the operating frequency until the water outlet of the desalted water outlet pipeline (32) satisfies: t2≤T2 and Q≥Q1 and P 除盐 ≥P3, go to step S2, If the power of the first desalted water pump (331) reaches the maximum value and still cannot satisfy: t2≤T2 and Q≥Q1 and P 除盐 ≥P3, the second desalted water pump (332) is controlled to work, and the frequency of the second desalted water pump (332) is adjusted according to the above parameters until the following conditions are met: t2≤T2 and Q≥Q1 and P 除盐 ≥P3, go to step S2.

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