Steam dryness detection device and detection method thereof

Abstract

The invention provides a steam dryness detection device and a detection method thereof, the steam dryness detection device is used for detecting the steam dryness of a boiler, the steam dryness detection device comprises a heat exchanger, the heat exchanger is provided with a heat source inlet, a condensate water outlet, a cold source inlet and a cold source outlet, and the heat source inlet is communicated with a steam outlet of the boiler through a first pipeline; a third pipeline is arranged between the second pipeline and the cold source inlet, the cold source outlet is communicated with the second pipeline through a fourth pipeline, a first detection device is arranged on the first pipeline, a second detection device is arranged on the second pipeline, and a third detection device is arranged on the third pipeline. And a fourth detection device is arranged on the fourth pipeline. According to the technical scheme provided by the invention, the problem that scaling is easily caused and the fault rate is relatively high when dryness is measured by using a steam-water separator at the outlet of the boiler in the related technology can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of steam dryness detection, and in particular to a steam dryness detection device and a detection method thereof. Background Art

[0002] Steam is a commonly used heat source and power source in industry. The quality of steam has an important impact on production efficiency and safety. The steam dryness can reflect the quality of steam. If the steam dryness is small, the saturated steam contains more water, which will not only reduce the production efficiency when using steam equipment, but also affect the service life of the equipment and cause corrosion. Therefore, it is necessary to test the steam dryness.

[0003] In the related art, the steam dryness at the boiler outlet is usually detected by using chemical method and conductivity method to detect the chloride ion content at the boiler outlet. When measuring the steam dryness, it is necessary to use a steam-water separator to separate the steam from the water, collect the saturated water after separation and measure the chloride ion content in the water, so as to obtain the steam dryness.

[0004] However, the use of a steam-water separator at the boiler outlet to measure dryness in the related art is prone to scaling, resulting in a high failure rate. Summary of the invention

[0005] The present invention provides a steam dryness detection device and a detection method thereof, so as to solve the problem in the related art that the use of a steam-water separator at a boiler outlet to measure dryness is prone to scaling, resulting in a high failure rate.

[0006] According to one aspect of the present invention, a steam dryness detection device is provided for detecting the steam dryness of a boiler. The steam dryness detection device includes a heat exchanger, the heat exchanger having a first heat exchange channel and a second heat exchange channel, two ends of the first heat exchange channel are a heat source inlet and a condensate outlet, respectively, two ends of the second heat exchange channel are a cold source inlet and a cold source outlet, respectively, the heat source inlet is connected to the steam outlet of the boiler through a first pipeline, the condensate outlet is connected to the return water port of the boiler through a second pipeline, a third pipeline is arranged between the second pipeline and the cold source inlet, the cold source outlet is connected to the second pipeline through a fourth pipeline, the intersection of the fourth pipeline and the second pipeline is located between the intersection of the third pipeline and the second pipeline and the return water port, a first detection device is arranged on the first pipeline, a second detection device is arranged on the second pipeline, a third detection device is arranged on the third pipeline, and a fourth detection device is arranged on the fourth pipeline.

[0007] Further, the first detection device includes a first temperature gauge and a first pressure gauge, the second detection device includes a second temperature gauge and a second pressure gauge, the third detection device includes a third temperature gauge and a third pressure gauge, and the fourth detection device includes a fourth temperature gauge and a fourth pressure gauge.

[0008] Furthermore, a pump body for transporting condensed water is arranged on the second pipeline, and an outlet of the pump body is connected to an inlet of the third pipeline.

[0009] Furthermore, flow meters for detecting the flow of condensed water are provided on the second pipeline and the third pipeline.

[0010] Furthermore, the outer side wall of the heat exchanger is provided with a heat insulation structure.

[0011] Furthermore, the steam dryness detection device also includes a PLC controller, which is signal-connected to the first detection device, the second detection device, the third detection device and the fourth detection device respectively.

[0012] According to another aspect of the present invention, a steam dryness detection method is provided, which is implemented by the steam dryness detection device provided above, and the steam dryness detection method includes the following steps: obtaining a steam enthalpy value h1 in a first pipeline of the steam dryness detection device; obtaining a saturated water enthalpy value h2 in a second pipeline of the steam dryness detection device; determining a first heat exchange enthalpy value H1 of steam condensing into condensed water through the steam enthalpy value h1 and the saturated water enthalpy value h2; obtaining a cold source inlet enthalpy value h3 in a third pipeline of the steam dryness detection device; obtaining a cold source outlet enthalpy value h4 in a fourth pipeline of the steam dryness detection device; determining a second heat exchange enthalpy value H2 of condensed water heat absorption increase through the cold source inlet enthalpy value h3 and the cold source outlet enthalpy value h4; and determining the actual steam dryness through the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2.

[0013] Furthermore, the step of determining the actual steam dryness through the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2 includes: determining the theoretical steam dryness through the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2; determining the heat transfer coefficient k and the attenuation coefficient α in the heat exchanger of the steam dryness detection device; and determining the actual steam dryness based on the theoretical steam dryness, the heat transfer coefficient k and the attenuation coefficient α.

[0014] Furthermore, the step of determining the heat transfer coefficient k in the heat exchanger of the steam quality detection device includes: the heat transfer coefficient k includes a first heat transfer coefficient k1 and a second heat transfer coefficient k2; the first heat transfer coefficient k1 is determined according to the following formula: Wherein, k1 is the first heat transfer coefficient of steam transported from the first pipeline to the second pipeline, H 1S The actual steam enthalpy value obtained by measuring the actual dryness value by chemical measurement method, H1 is the first heat transfer enthalpy value; the second heat transfer coefficient k2 is determined according to the following formula: Wherein, k2 is the second heat transfer coefficient of the condensed water transported from the third pipeline to the fourth pipeline, H 2sH2 is the enthalpy value of the actual condensed water heat absorption increase obtained by measuring the actual dryness value through chemical measurement, and H2 is the second heat exchange enthalpy value.

[0015] Further, the step of determining the attenuation coefficient α in the heat exchanger of the steam dryness detection device includes: the attenuation coefficient α includes a first attenuation coefficient α1 in which steam is transported from the first pipeline to the second pipeline and a second attenuation coefficient α2 in which steam is transported from the third pipeline to the fourth pipeline; the first attenuation coefficient α1 and the second attenuation coefficient α2 are determined according to the following formula: Among them, k i Take multiple k1 or multiple k2, i is a positive integer greater than or equal to 1, when k i Take multiple k1, α corresponds to α1, when k i Take multiple k2, the corresponding value of α is α2.

[0016] Furthermore, the step of determining the theoretical steam dryness by the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2 includes: determining the theoretical steam dryness x according to the following formula: x=(h4-h3-h2) / (h1-h2); H1=h1×x+h2(1-x); H2=h4-h3; H1=H2; wherein, h1 is the steam enthalpy value in the first pipeline of the steam dryness detection device, h2 is the saturated water enthalpy value in the second pipeline of the steam dryness detection device, h3 is the cold source inlet enthalpy value in the third pipeline of the steam dryness detection device, h4 is the cold source outlet enthalpy value in the fourth pipeline of the steam dryness detection device, H1 is the first heat exchange enthalpy value, H2 is the second heat exchange enthalpy value, and x is the theoretical steam dryness.

[0017] Further, the step of determining the actual steam dryness according to the theoretical steam dryness, the heat transfer coefficient k and the attenuation coefficient α includes: determining the actual steam dryness according to the following formula: H1k1α1=H2k2α2; Among them, x1 is the actual steam dryness, h1 is the steam enthalpy value in the first pipeline of the steam dryness detection device, h2 is the saturated water enthalpy value in the second pipeline of the steam dryness detection device, h3 is the cold source inlet enthalpy value in the third pipeline of the steam dryness detection device, h4 is the cold source outlet enthalpy value in the fourth pipeline of the steam dryness detection device, H1 is the first heat exchange enthalpy value, H2 is the second heat exchange enthalpy value, x is the theoretical steam dryness, k1 is the first heat transfer coefficient, k2 is the second heat transfer coefficient, α1 is the first attenuation coefficient, and α2 is the second attenuation coefficient.

[0018] By applying the technical solution of the present invention, the steam dryness detection device can detect the steam dryness of the boiler, thereby preventing the low steam dryness from affecting the boiler production efficiency. The steam dryness detection device includes a heat exchanger, and the steam outlet of the boiler is connected to the heat source inlet of the heat exchanger through a first pipeline, and the condensed water outlet of the heat exchanger is connected to a second pipeline, and the second pipeline is connected to the return water port of the boiler, so that the heat exchanger can be used to heat-exchange and condense the steam input from the steam outlet of the boiler into condensed water, and a third pipeline is arranged between the second pipeline and the cold source inlet of the heat exchanger, and the condensed water in the second pipeline can be input to the third pipeline to the cold source inlet of the heat exchanger through the third pipeline, and then the condensed water flowing in through the cold source inlet is used to heat-exchange the steam entering the heat source inlet of the heat exchanger, so as to realize the heat exchanger. Heat exchange is performed, and the cold source outlet is refluxed into the boiler through the fourth pipeline, and the condensed water after heat exchange is discharged into the boiler to realize closed circulation flow. In order to facilitate the detection of steam dryness, a first detection device is arranged on the first pipeline, a second detection device is arranged on the second pipeline, a third detection device is arranged on the third pipeline, and a fourth detection device is arranged on the fourth pipeline. Then, the heat detected by the first pipeline and the heat in the second pipeline are calculated, and the difference between the heat detected by the third pipeline and the heat in the fourth pipeline is calculated, so that the heat released by the condensation of steam from the first pipeline to the second pipeline is equal to the heat absorbed by the condensed water from the third pipeline to the fourth pipeline, so as to ensure that the steam produced by the boiler is detected by the steam dryness detection device, so as to facilitate the adjustment of the working conditions of the boiler and other equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of a steam dryness detection device provided in an embodiment of the present invention is shown;

[0021] Figure 2 A flow chart of a steam dryness detection method provided according to an embodiment of the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. heat exchanger; 11. first heat exchange channel; 111. heat source inlet; 112. condensed water outlet; 12. second heat exchange channel; 121. cold source inlet; 122. cold source outlet;

[0024] 20. first pipeline; 21. first detection device; 211. first temperature gauge; 212. first pressure gauge;

[0025] 30. Second pipeline; 31. Second detection device; 311. Second temperature gauge; 312. Second pressure gauge; 32. Pump body;

[0026] 40. third pipeline; 41. third detection device; 411. third temperature gauge; 412. third pressure gauge;

[0027] 50. fourth pipeline; 51. fourth detection device; 511. fourth temperature gauge; 512. fourth pressure gauge;

[0028] 60. Boiler; 61. Steam outlet; 62. Water return outlet;

[0029] 72. Flow meter. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] like Figure 1 As shown, an embodiment of the present invention provides a steam dryness detection device for detecting the steam dryness of a boiler 60. The steam dryness detection device includes a heat exchanger 10. The heat exchanger 10 has a first heat exchange channel 11 and a second heat exchange channel 12. The two ends of the first heat exchange channel 11 are a heat source inlet 111 and a condensed water outlet 112, respectively. The two ends of the second heat exchange channel 12 are a cold source inlet 121 and a cold source outlet 122, respectively. The heat source inlet 111 is connected to the steam outlet 61 of the boiler 60 through a first pipeline 20, and the condensed water outlet 112 is connected to the steam outlet 61 of the boiler 60 through a second pipeline 30. It is connected to the return water port 62 of the boiler 60, a third pipeline 40 is arranged between the second pipeline 30 and the cold source inlet 121, the cold source outlet 122 and the second pipeline 30 are connected through the fourth pipeline 50, and the intersection of the fourth pipeline 50 and the second pipeline 30 is located between the intersection of the third pipeline 40 and the second pipeline 30 and the return water port 62, a first detection device 21 is arranged on the first pipeline 20, a second detection device 31 is arranged on the second pipeline 30, a third detection device 41 is arranged on the third pipeline 40, and a fourth detection device 51 is arranged on the fourth pipeline 50.

[0032] The steam dryness detection device provided in this embodiment is applied, and the steam dryness detection device can detect the steam dryness of the boiler 60, thereby preventing the low steam dryness from affecting the production efficiency of the boiler 60. The steam dryness detection device includes a heat exchanger 10, and the steam outlet 61 of the boiler 60 is connected to the heat source inlet 111 of the heat exchanger 10 through the first pipeline 20, and the condensed water outlet 112 of the heat exchanger 10 is connected to the second pipeline 30, and the second pipeline 30 is connected to the return water port 62 of the boiler 60, so that the heat exchanger 10 can be used to heat exchange and condense the steam input from the steam outlet 61 of the boiler 60 into condensed water, and a third pipeline 40 is set between the second pipeline 30 and the cold source inlet 121 of the heat exchanger 10, and the condensed water in the second pipeline 30 can be input to the third pipeline 40 to the cold source inlet 121 of the heat exchanger 10 through the third pipeline 40, and then the condensed water flowing in through the cold source inlet 121 is used to heat the heat source inlet 111 in the heat exchanger 10. The steam is heat exchanged to realize the heat exchange function of the heat exchanger 10, and the cold source outlet 122 is refluxed to the boiler 60 through the fourth pipeline 50, and then the condensed water after heat exchange is discharged into the boiler 60 to realize closed circulation flow, and in order to facilitate the detection of steam quality, a first detection device 21 is set on the first pipeline 20, a second detection device 31 is set on the second pipeline 30, a third detection device 41 is set on the third pipeline 40, and a fourth detection device 51 is set on the fourth pipeline 50, and then the heat detected by the first pipeline 20 and the heat in the second pipeline 30 are calculated, and the difference between the heat detected by the third pipeline 40 and the heat in the fourth pipeline 50 is calculated, so that the heat released by the condensation of steam from the first pipeline 20 to the second pipeline 30 is equal to the heat absorbed by the condensed water from the third pipeline 40 to the fourth pipeline 50, ensuring that the steam produced by the boiler 60 is detected by the steam quality detection device, so as to facilitate the adjustment of the working conditions of the boiler 60 and other equipment.

[0033] like Figure 1As shown, the first detection device 21 includes a first temperature gauge 211 and a first pressure gauge 212, the second detection device 31 includes a second temperature gauge 311 and a second pressure gauge 312, the third detection device 41 includes a third temperature gauge 411 and a third pressure gauge 412, and the fourth detection device 51 includes a fourth temperature gauge 511 and a fourth pressure gauge 512. By adopting the above structure, the first thermometer 211 and the first pressure gauge 212 are set to detect the temperature and pressure of the first pipeline 20, so as to obtain the steam enthalpy value in the first pipeline 20; the second thermometer 311 and the second pressure gauge 312 detect the temperature and pressure of the second pipeline 30, so as to obtain the saturated water enthalpy value in the second pipeline 30; the third thermometer 411 and the third pressure gauge 412 detect the temperature and pressure of the condensed water in the third pipeline 40, so as to obtain the enthalpy value of the condensed water in the third pipeline 40; the fourth thermometer 511 and the fourth pressure gauge 512 detect the temperature and pressure in the fourth pipeline 50, so as to obtain the enthalpy value of the condensed water in the fourth pipeline 50, so as to facilitate the steam dryness detection of the steam in the boiler 60, so that the operation process is simple and convenient for detection.

[0034] like Figure 1 As shown, a pump body 32 for transporting condensed water is provided on the second pipeline 30, and the outlet of the pump body 32 is connected to the inlet of the third pipeline 40. With the above structure, by providing the pump body 32 on the second pipeline 30, the pump body 32 can transport the condensed water, and then the condensed water can be transported to the third pipeline 40 under the action of the pump body 32, and then transported to the second heat exchange channel 12 in the heat exchanger 10 to exchange heat with the first heat exchange channel 11 where steam flows, so as to facilitate steam quality.

[0035] like Figure 1 As shown, a flow meter 72 for detecting the condensed water flow is provided on both the second pipeline 30 and the third pipeline 40. With the above structure, by providing the flow meter 72, it is convenient to control the pump body 32 to transport the condensed water to the third pipeline 40, and then it is convenient to observe the condensed water flow in the second pipeline 30 and the third pipeline 40.

[0036] In this embodiment, a heat preservation structure is provided on the outer wall of the heat exchanger 10. With the above structure, by providing a heat preservation structure on the outer wall of the heat exchanger 10, the heat exchanger 10 is easily insulated, thereby improving the practicality and reliability of the steam dryness detection device.

[0037] In this embodiment, the steam dryness detection device further includes a PLC controller, which is respectively connected to the first detection device 21, the second detection device 31, the third detection device 41, and the fourth detection device 51 by signals. With the above structure, by setting the PLC controller, it is convenient to use the PLC controller to transmit signals to the first detection device 21, the second detection device 31, the third detection device 41, and the fourth detection device 51, so that the steam dryness can be quickly calculated, thereby improving the automation of the steam dryness detection device.

[0038] like Figure 2 As shown, another embodiment of the present invention provides a steam dryness detection method, which is implemented by the steam dryness detection device provided above. The steam dryness detection method includes the following steps:

[0039] Obtaining the steam enthalpy value h1 in the first pipeline 20 of the steam dryness detection device;

[0040] Obtaining the saturated water enthalpy value h2 in the second pipeline 30 of the steam dryness detection device;

[0041] Determine the first heat exchange enthalpy value H1 of steam condensation into condensed water by using the steam enthalpy value h1 and the saturated water enthalpy value h2;

[0042] Obtaining the cold source inlet enthalpy value h3 in the third pipeline 40 of the steam dryness detection device;

[0043] Obtaining the enthalpy value h4 of the cold source outlet in the fourth pipeline 50 of the steam dryness detection device;

[0044] The second heat exchange enthalpy value H2 of the condensed water heat absorption increase is determined by the cold source inlet enthalpy value h3 and the cold source outlet enthalpy value h4;

[0045] The actual steam quality is determined by the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2.

[0046] By adopting the above steps, the steam enthalpy value h1 in the first pipeline 20 is first obtained, and then the saturated water enthalpy value h2 in the second pipeline 30 is obtained. The first heat exchange enthalpy value H1 of steam becoming condensed water can be obtained through the steam enthalpy value h1 and the saturated water enthalpy value h2, and then the steam can be heat exchanged through the first heat exchange channel 11 to convert the steam into condensed water by heat release, so that the released heat is the first heat exchange enthalpy value H1, and then the cold source inlet enthalpy value h3 in the third pipeline 40 is obtained, and the cold source outlet enthalpy value h4 in the fourth pipeline 50 is detected, and then the heat exchange enthalpy value h4 of the cold source is obtained. The inlet enthalpy value h3 of the supercooling source and the outlet enthalpy value h4 of the cold source determine the second heat exchange enthalpy value H2 of the condensed water absorbed in the second heat exchange channel 12, so that the enthalpy value of the condensed water absorbed is equal to the enthalpy value of the steam released to become condensed water, so that the actual steam dryness is determined by the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2, ensuring that the steam dryness detection method for the steam generated by the boiler 60 is accurate and reliable, facilitating personnel to observe the steam dryness, avoiding malfunctions of the boiler or other equipment when the steam dryness is low, and ensuring accurate measurement results.

[0047] In this embodiment, the step of determining the actual steam quality by using the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2 includes:

[0048] Determine the theoretical steam quality by the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2;

[0049] Determine the heat transfer coefficient k and the attenuation coefficient α in the heat exchanger 10 of the steam dryness detection device;

[0050] The actual steam dryness is determined according to the theoretical steam dryness, the heat transfer coefficient k and the attenuation coefficient α. By adopting the above steps, the heat released in the first heat exchange channel 11 is equal to the heat added in the second heat exchange channel 12, and then the first heat exchange enthalpy value H1 can be obtained to be equal to the heat exchange enthalpy value H2, and the theoretical steam dryness can be determined. Then, the heat transfer coefficient k and the attenuation coefficient α in the heat exchanger 10 of the steam dryness detection device are determined, and the actual steam dryness can be obtained by calculating the heat transfer coefficient k and the attenuation coefficient α of the heat exchanger 10 with the theoretical steam dryness, so as to ensure that the heat transfer efficiency and loss of the heat exchanger 10 itself during long-term use are taken into consideration, and the actual steam dryness is obtained, thereby improving the accuracy of the steam dryness detection method.

[0051] In this embodiment, the step of determining the heat transfer coefficient k in the heat exchanger 10 of the steam quality detection device includes:

[0052] The heat transfer coefficient k includes a first heat transfer coefficient k1 and a second heat transfer coefficient k2;

[0053] The first heat transfer coefficient k1 is determined according to the following formula:

[0054]

[0055] Wherein, k1 is the first heat transfer coefficient of steam transported from the first pipeline 20 to the second pipeline 30, H 1S is the actual steam enthalpy value obtained by measuring the actual dryness value by chemical measurement method, H1 is the first heat exchange enthalpy value;

[0056] The second heat transfer coefficient k2 is determined according to the following formula:

[0057]

[0058] Wherein, k2 is the second heat transfer coefficient of the condensed water transported from the third pipeline 40 to the fourth pipeline 50, H 2s The enthalpy value of the actual condensed water heat absorption increase obtained by measuring the actual dryness value by chemical measurement method, H2 is the second heat transfer enthalpy value. By adopting the above steps, the first heat transfer coefficient of steam transported from the first pipeline 20 to the second pipeline 30 is determined, and H 1S In order to obtain the actual dryness value by chemical measurement, the actual enthalpy value of the condensed water heat absorption is calculated by the formula It is convenient to obtain the first heat transfer coefficient k1, determine the second heat transfer coefficient of the condensed water transported from the third pipeline 40 to the fourth pipeline 50, and then use the actual enthalpy value H of the actual condensed water heat absorption increase obtained by measuring the actual dryness value through the chemical measurement method 2s , and use the formula It is convenient to obtain the second heat transfer coefficient k2.

[0059] In this embodiment, the step of determining the attenuation coefficient α in the heat exchanger 10 of the steam quality detection device includes:

[0060] The attenuation coefficient α includes a first attenuation coefficient α1 for steam transported from the first pipeline 20 to the second pipeline 30 and a second attenuation coefficient α2 for steam transported from the third pipeline 40 to the fourth pipeline 50;

[0061] The first attenuation coefficient α1 and the second attenuation coefficient α2 are determined according to the following formula:

[0062]

[0063] Among them, k i Take multiple k1 or multiple k2, i is a positive integer greater than or equal to 1, when k i Take multiple k1, α corresponds to α1, when k iTake multiple k2, α corresponding value is α2. By adopting the above steps, by determining the first attenuation coefficient α1 of steam transported from the first pipeline 20 to the second pipeline 30 and the second attenuation coefficient α2 of steam transported from the third pipeline 40 to the fourth pipeline 50, it is convenient to determine the attenuation coefficient α1 in the first heat exchange channel 11 and the attenuation coefficient α2 in the second heat exchange channel 12, and then consider the attenuation coefficient when calculating the actual dryness, so that the method of detecting the steam dryness can be more accurate and reliable.

[0064] In this embodiment, the step of determining the theoretical steam quality by the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2 includes:

[0065] Determine the theoretical steam dryness x according to the following formula:

[0066] x = (h4-h3-h2) / (h1-h2);

[0067] H1=h1×x+h2(1-x);

[0068] H2=h4-h3;

[0069] H1=H2;

[0070] Among them, h1 is the steam enthalpy value in the first pipeline 20 of the steam dryness detection device, h2 is the saturated water enthalpy value in the second pipeline 30 of the steam dryness detection device, h3 is the cold source inlet enthalpy value in the third pipeline 40 of the steam dryness detection device, h4 is the cold source outlet enthalpy value in the fourth pipeline 50 of the steam dryness detection device, H1 is the first heat exchange enthalpy value, H2 is the second heat exchange enthalpy value, and x is the theoretical steam dryness. By adopting the above steps, the theoretical steam dryness x is determined by the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2, and then the theoretical steam dryness x is obtained by the above formula, and then the actual steam dryness is obtained by the attenuation coefficient α and the heat exchange coefficient k.

[0071] In this embodiment, the step of determining the actual steam quality according to the theoretical steam quality, the heat transfer coefficient k and the attenuation coefficient α includes:

[0072] The actual steam dryness is determined according to the following formula:

[0073] H1k1α1=H2k2α2;

[0074]

[0075] Among them, x1 is the actual steam dryness, h1 is the steam enthalpy value in the first pipeline 20 of the steam dryness detection device, h2 is the saturated water enthalpy value in the second pipeline 30 of the steam dryness detection device, h3 is the cold source inlet enthalpy value in the third pipeline 40 of the steam dryness detection device, h4 is the cold source outlet enthalpy value in the fourth pipeline 50 of the steam dryness detection device, H1 is the first heat exchange enthalpy value, H2 is the second heat exchange enthalpy value, x is the theoretical steam dryness, k1 is the first heat exchange coefficient, k2 is the second heat exchange coefficient, α1 is the first attenuation coefficient, and α2 is the second attenuation coefficient. By adopting the above steps, the actual steam dryness can be obtained by using the above formula through the theoretical steam dryness, heat exchange coefficient k and attenuation coefficient α, so that the steam dryness detection result is reliable.

[0076] The device provided by this embodiment has the following beneficial effects:

[0077] (1) By setting a first thermometer 211 and a first pressure gauge 212 to detect the temperature and pressure of the first pipeline 20, the enthalpy value of the steam in the first pipeline 20 can be obtained; the second thermometer 311 and the second pressure gauge 312 detect the temperature and pressure of the second pipeline 30, and the enthalpy value of the saturated water in the second pipeline 30 can be obtained; the third thermometer 411 and the third pressure gauge 412 detect the temperature and pressure of the condensed water in the third pipeline 40, and the enthalpy value of the condensed water in the third pipeline 40 can be obtained; the fourth thermometer 511 and the fourth pressure gauge 512 detect the temperature and pressure in the fourth pipeline 50, and the enthalpy value of the condensed water in the fourth pipeline 50 can be obtained, so as to facilitate the steam quality detection of the steam in the boiler 60;

[0078] (2) By providing a heat-insulating structure on the outer wall of the heat exchanger 10, the heat exchanger 10 can be easily insulated, thereby improving the practicality and reliability of the steam dryness detection device;

[0079] (3) By setting up a PLC controller, it is convenient to use the PLC controller to transmit signals to the first detection device 21, the second detection device 31, the third detection device 41 and the fourth detection device 51, so that the steam dryness can be quickly calculated, thereby improving the automation level of the steam dryness detection device.

[0080] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0081] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0082] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0083] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0084] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A steam dryness detection device, used for detecting steam dryness of a boiler (60), characterized in that: The steam quality detection device comprises a heat exchanger (10), wherein the heat exchanger (10) has a first heat exchange channel (11) and a second heat exchange channel (12), wherein two ends of the first heat exchange channel (11) are respectively a heat source inlet (111) and a condensed water outlet (112), and two ends of the second heat exchange channel (12) are respectively a cold source inlet (121) and a cold source outlet (122), wherein the heat source inlet (111) is connected to the steam outlet (61) of the boiler (60) via a first pipeline (20), and the condensed water outlet (112) is connected to the water return port (62) of the boiler (60) via a second pipeline (30), and the second pipeline (30) is connected to the cold source inlet (121) and the cold source outlet (122). A third pipeline (40) is arranged between the cold source inlet (121), the cold source outlet (122) and the second pipeline (30) are connected via a fourth pipeline (50), the intersection of the fourth pipeline (50) and the second pipeline (30) is located between the intersection of the third pipeline (40) and the second pipeline (30) and the water return port (62), a first detection device (21) is arranged on the first pipeline (20), a second detection device (31) is arranged on the second pipeline (30), a third detection device (41) is arranged on the third pipeline (40), and a fourth detection device (51) is arranged on the fourth pipeline (50).

2. The steam dryness detection device according to claim 1, characterized in that: The first detection device (21) comprises a first temperature gauge (211) and a first pressure gauge (212), the second detection device (31) comprises a second temperature gauge (311) and a second pressure gauge (312), the third detection device (41) comprises a third temperature gauge (411) and a third pressure gauge (412), and the fourth detection device (51) comprises a fourth temperature gauge (511) and a fourth pressure gauge (512).

3. The steam dryness detection device according to claim 2, characterized in that: The second pipeline (30) is provided with a pump body (32) for transporting condensed water, and the outlet of the pump body (32) is connected to the inlet of the third pipeline (40).

4. The steam dryness detection device according to claim 1, characterized in that: The second pipeline (30) and the third pipeline (40) are both provided with flow meters (72) for detecting the flow rate of condensed water.

5. The steam dryness detection device according to claim 1, characterized in that: The outer side wall of the heat exchanger (10) is provided with a heat insulation structure.

6. The steam dryness detection device according to claim 1, characterized in that: The steam dryness detection device further comprises a PLC controller, and the PLC controller is respectively connected to the first detection device (21), the second detection device (31), the third detection device (41) and the fourth detection device (51) by signals.

7. A method for detecting steam dryness, characterized in that: The steam dryness detection method is implemented by the steam dryness detection device according to any one of claims 1 to 6, and comprises the following steps: Obtaining the steam enthalpy value h1 in the first pipeline (20) of the steam dryness detection device; Obtaining a saturated water enthalpy value h2 in a second pipeline (30) of the steam dryness detection device; Determine a first heat exchange enthalpy value H1 of steam condensation into condensed water by using the steam enthalpy value h1 and the saturated water enthalpy value h2; Obtaining a cold source inlet enthalpy value h3 in a third pipeline (40) of the steam dryness detection device; Obtaining the enthalpy value h4 of the cold source outlet in the fourth pipeline (50) of the steam dryness detection device; Determine the second heat exchange enthalpy value H2 of the condensed water heat absorption increase through the cold source inlet enthalpy value h3 and the cold source outlet enthalpy value h4; The actual steam quality is determined by the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2.

8. The method for detecting steam dryness according to claim 7, characterized in that: The step of determining the actual steam quality by using the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2 comprises: Determining theoretical steam quality by using the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2; Determining a heat transfer coefficient k and an attenuation coefficient α in a heat exchanger (10) of the steam quality detection device; The actual steam quality is determined according to the theoretical steam quality, the heat transfer coefficient k, and the attenuation coefficient α.

9. The method for detecting steam dryness according to claim 8, characterized in that: The step of determining the heat transfer coefficient k in the heat exchanger (10) of the steam quality detection device comprises: The heat transfer coefficient k includes a first heat transfer coefficient k1 and a second heat transfer coefficient k2; The first heat transfer coefficient k1 is determined according to the following formula: Wherein, k1 is the first heat transfer coefficient of steam transported from the first pipeline (20) to the second pipeline (30), H 1S is the actual steam enthalpy value obtained by measuring the actual dryness value by chemical measurement method, H1 is the first heat exchange enthalpy value; The second heat transfer coefficient k2 is determined according to the following formula: Wherein, k2 is the second heat transfer coefficient of the condensed water transported from the third pipeline (40) to the fourth pipeline (50), H 2S H2 is the enthalpy value of the actual condensed water heat absorption increase obtained by measuring the actual dryness value through a chemical measurement method, and H2 is the second heat exchange enthalpy value.

10. The method for detecting steam dryness according to claim 9, characterized in that: The step of determining the attenuation coefficient α in the heat exchanger (10) of the steam quality detection device comprises: The attenuation coefficient α includes a first attenuation coefficient α1 when steam is transported from the first pipeline (20) to the second pipeline (30) and a second attenuation coefficient α2 when steam is transported from the third pipeline (40) to the fourth pipeline (50); The first attenuation coefficient α1 and the second attenuation coefficient α2 are determined according to the following formula: Among them, k i Take multiple k1 or multiple k2, i is a positive integer greater than or equal to 1, when k i Take multiple k1, The corresponding value of α is α1, when k i Take multiple k2, the corresponding value of α is α2.

11. The method for detecting steam dryness according to claim 8, characterized in that: The step of determining the theoretical steam quality by using the first heat exchange enthalpy value H1 and the second heat exchange enthalpy value H2 comprises: Determine the theoretical steam dryness x according to the following formula: x = (h4-h3-h2) / (h1-h2); H1=h1×x+h2(1-x); H2=h4-h3; H1=H2; wherein h1 is the steam enthalpy value in the first pipeline (20) of the steam dryness detection device, h2 is the saturated water enthalpy value in the second pipeline (30) of the steam dryness detection device, h3 is the cold source inlet enthalpy value in the third pipeline (40) of the steam dryness detection device, h4 is the cold source outlet enthalpy value in the fourth pipeline (50) of the steam dryness detection device, H1 is the first heat exchange enthalpy value, H2 is the second heat exchange enthalpy value, x is the theoretical steam dryness.

12. The method for detecting steam dryness according to claim 10, characterized in that: The step of determining the actual steam quality according to the theoretical steam quality, the heat transfer coefficient k and the attenuation coefficient α comprises: The actual steam dryness is determined according to the following formula: H1k1α1=H2k2α2; Wherein, x1 is the actual steam dryness, h1 is the steam enthalpy value in the first pipeline (20) of the steam dryness detection device, h2 is the saturated water enthalpy value in the second pipeline (30) of the steam dryness detection device, h3 is the cold source inlet enthalpy value in the third pipeline (40) of the steam dryness detection device, h4 is the cold source outlet enthalpy value in the fourth pipeline (50) of the steam dryness detection device, H1 is the first heat exchange enthalpy value, H2 is the second heat exchange enthalpy value, x is the theoretical steam dryness, k1 is the first heat exchange coefficient, k2 is the second heat exchange coefficient, α1 is the first attenuation coefficient, and α2 is the second attenuation coefficient.

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