Flue gas humidity measuring device and method based on ionization principle
By using a flue gas humidity measurement device based on the ionization principle in the dust collector of the thermal power plant, the flue gas is ionized under a preset voltage using the ionization humidity measurement component, which solves the long time and poor stability of the flue gas humidity measurement in the prior art. The problem of this problem achieves convenient and efficient humidity measurement, with the advantages of long life and low cost.
Patent Information
- Application Number
- CN202411179907.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2024-12-13
AI Technical Summary
In the prior art, the flue gas humidity measurement equipment of the dust collector of the thermal power plant is based on the moisture absorption method, the dry and wet bulb method and the condensation method, and has problems such as long measurement time, susceptibility to environmental temperature, large and complex volume, and poor stability.
Using a flue gas humidity measurement device based on the ionization principle, including a smoke sampling component, a smoke filter and an ionization humidity measurement component, the water-containing flue gas is ionized at a preset voltage, and the flue gas humidity is calculated based on the current value, combined with heating Smoke sampling gun improves the convenience of data acquisition.
It solves the problems of long time, poor stability and susceptibility to temperature of traditional methods. It has the advantages of long life, convenient electrode replacement and low cost, and improves the convenience of data acquisition.
Smart Images
Figure CN119125228A_ABST
Abstract
Description
Technical Field
[0001] The disclosed embodiments belong to the technical field of flue gas measurement for dust collectors in power plants, and specifically relate to a flue gas humidity measurement device and a measurement method based on the ionization principle. Background Art
[0002] At present, the common equipment used in the market for measuring the moisture content of flue gas in thermal power plant dust collectors is generally based on the working principles of the hygroscopic method, the wet-dry bulb method and the condensation method. The equipment for measuring moisture content by the hygroscopic method is generally large and not portable enough; the wet-dry bulb method takes a long time to measure moisture content and is easily affected by the ambient temperature. In addition, due to the need for evaporation, it is not applicable in environments with temperatures above 100°C; the condensation method has poor accuracy in environments with temperatures above 100°C, has high requirements for the measurement section, and is difficult to control the stable reading time during the measurement process, making it difficult to calibrate and trace the source.
[0003] In view of the above problems, it is necessary to propose a flue gas humidity measurement device and a measurement method based on the ionization principle that are reasonably designed and can effectively solve the above problems. Summary of the invention
[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a flue gas humidity measurement device and a measurement method based on the ionization principle.
[0005] One aspect of an embodiment of the present disclosure provides a flue gas humidity measurement device based on the ionization principle, which is applied to a dust collector of a thermal power plant. The device includes:
[0006] The smoke sampling assembly is used to collect smoke in the flue of the dust collector of a thermal power plant;
[0007] A smoke filter connected to the smoke sampling assembly and used to filter the collected smoke to obtain smoke containing water vapor;
[0008] The ionization humidity measurement component is connected to the smoke filter and is used to ionize the water vapor-containing smoke at a preset voltage to obtain a corresponding current value, and obtain the smoke humidity according to the current value.
[0009] Optionally, the ionization humidity measurement component includes a shell, a first electrode structure and a second electrode structure arranged on the shell;
[0010] The first electrode structure and the second electrode structure are relatively distributed, and the distance between them ranges from 8um to 12um;
[0011] The ends of the first electrode structure and the second electrode structure are both provided with nano-semiconductor layers.
[0012] Optionally, the nano semiconductor layer is P-type CuO nanowires.
[0013] Optionally, the inner side wall of the shell is provided with a first groove;
[0014] The first electrode structure includes a first metal plate, a first silicon pillar and a first nano-semiconductor layer; wherein,
[0015] The first metal plate is disposed in the first groove;
[0016] A first end of the first silicon column is connected to the first metal plate, and a second end of the first silicon column is connected to the first nano-semiconductor layer.
[0017] Optionally, the inner side wall of the housing is provided with a second groove;
[0018] The second electrode structure includes a second metal plate, a second silicon pillar and a second nano-semiconductor layer; wherein,
[0019] The second metal plate is disposed in the second groove;
[0020] A first end of the second silicon column is connected to the second metal plate, and a second end of the second silicon column is connected to the second nano-semiconductor layer.
[0021] Optionally, the first metal plate and the second metal plate are both metal copper plates.
[0022] Optionally, the smoke sampling assembly includes a sampling head, a smoke channel and a heating element;
[0023] The first end of the sampling head is used to insert into the side hole of the dust collector flue for sampling, and the second end of the sampling head is connected to the first end of the smoke channel;
[0024] The heating element is arranged at the second end of the smoke channel and is used for heating the collected smoke.
[0025] Optionally, it further includes a processor, wherein the processor is electrically connected to the ionization humidity measurement component;
[0026] The processor is used to obtain smoke humidity by ionizing water vapor in the smoke at a preset voltage to obtain a corresponding current value.
[0027] Optionally, a handle is also included;
[0028] The handle is connected to the ionization humidity measurement component.
[0029] Another aspect of the embodiment of the present disclosure provides a flue gas humidity measurement method based on the ionization principle, which is applied to a dust collector of a thermal power plant and is measured using the flue gas humidity measurement device based on the ionization principle as described above; the method comprises:
[0030] The smoke sampling component is used to collect smoke in the flue of the dust collector of the thermal power plant;
[0031] The collected smoke is filtered through the smoke filter to obtain smoke containing water vapor;
[0032] The water vapor-containing flue gas is ionized by the ionization humidity measurement component to obtain a corresponding current value, and the flue gas humidity is obtained according to the current value; wherein,
[0033] Under a preset voltage, the ionization humidity measurement component ionizes water vapor in the water vapor-containing flue gas to obtain a first current value;
[0034] The collected smoke is heated to a preset temperature, and the ionization humidity measurement component ionizes the dry smoke to obtain a second current value;
[0035] The smoke humidity is obtained according to a current difference between the first current value and the second current value.
[0036] The flue gas humidity measuring device and method based on the ionization principle provided by the disclosed embodiment, the flue gas humidity measuring device ionizes the water vapor-containing flue gas under a preset voltage through the ionization humidity measuring component to obtain the corresponding current value, and obtains the flue gas humidity according to the current value, which solves the defects of the traditional dust collector flue gas humidity analyzer based on the working principle of the hygroscopic method, the dry-wet bulb method and the condensation method, such as long measurement time, easy to be affected by the ambient temperature, large and complex volume, and poor stability. At the same time, it has the advantages of long life, convenient electrode replacement, and low cost. In particular, the measuring device can be directly combined with the existing heatable smoke sampling gun, which greatly improves the convenience of data acquisition. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] Figure 1 This is a schematic structural diagram of a smoke humidity measuring device based on the ionization principle according to an embodiment of the present disclosure;
[0038] Figure 2 It is a structural schematic diagram of an ionization humidity measurement component of another embodiment of the disclosed embodiment;
[0039] Figure 3 A schematic diagram of the morphology of a P-type CuO nanowire according to another embodiment of the present disclosure;
[0040] Figure 4 This is a flow chart of a method for measuring flue gas humidity based on the ionization principle according to another embodiment of the present disclosure. DETAILED DESCRIPTION
[0041] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0042] like Figure 1 As shown, one aspect of an embodiment of the present disclosure provides a flue gas humidity measuring device 100 based on the ionization principle, which is applied to a dust collector in a thermal power plant. The flue gas humidity measuring device 100 includes a smoke sampling component 110 , a smoke filter 120 and an ionization humidity measuring component 130 .
[0043] The smoke sampling assembly 110 is used to collect smoke in the flue of the dust collector of a thermal power plant.
[0044] The smoke filter 120 is connected to the smoke sampling assembly and is used to filter the collected smoke to obtain smoke containing water vapor. The smoke filter 120 prevents smoke from accumulating on the electrode surface of the ionization humidity measurement assembly 130, changing the electrode spacing and affecting the measurement result.
[0045] The ionization humidity measurement component 130 is connected to the smoke filter 120, and is used to ionize the smoke containing water vapor under a preset voltage to obtain a corresponding current value, and obtain the smoke humidity according to the current value.
[0046] When in use, insert the smoke sampling component 110 into the measuring hole of the dust collector flue, and quantitatively extract the smoke under the action of the pump. Most of the collected smoke enters the filter cartridge, and a very small part escapes and is blocked by the smoke filter 120. After filtering by the smoke filter 120, water vapor-containing smoke is obtained. Then, the smoke containing water vapor enters the ionization humidity measurement component 130. Under a preset voltage, the ionization humidity measurement component 130 ionizes the water vapor in the water vapor-containing smoke to obtain a first current value, heats the collected smoke to a preset temperature, and the ionization humidity measurement component 130 ionizes the dry smoke to obtain a second current value; the smoke humidity is obtained according to the current difference between the first current value and the second current value. Among them, there is a corresponding relationship between the current generated by the ionization humidity measurement component 130 when ionizing the smoke and the humidity of the smoke, and the corresponding corresponding relationship can be found to obtain the smoke humidity.
[0047] The flue gas humidity measuring device based on the ionization principle provided by the embodiment of the present disclosure ionizes the water vapor-containing flue gas under a preset voltage through the ionization humidity measuring component to obtain the corresponding current value, and obtains the flue gas humidity according to the current value, which solves the defects of the traditional dust collector flue gas humidity analyzer based on the working principle of the hygroscopic method, the dry-wet-bulb method and the condensation method, such as long measurement time, easy to be affected by the ambient temperature, large and complex volume, and poor stability. At the same time, it has the advantages of long life, convenient electrode replacement, and low cost. In particular, the measuring device can be directly combined with the existing heatable smoke sampling gun, which greatly improves the convenience of data acquisition.
[0048] For example, Figure 2 As shown, the ionization humidity measurement component 130 includes a housing 131, a first electrode structure 132 and a second electrode structure 133 disposed on the housing 131. The first electrode structure 132 and the second electrode structure 133 are respectively a positive electrode structure and a negative electrode structure.
[0049] The first electrode structure 132 and the second electrode structure 133 are arranged opposite to each other, and the distance between them is in the range of 8 um to 12 um. Specifically, in this embodiment, the distance between the first electrode structure 132 and the second electrode structure 133 is 10 um.
[0050] A nano-semiconductor layer 134 is disposed at the ends of the first electrode structure 132 and the second electrode structure 133 .
[0051] In this embodiment, the shell 131 can be made of polytetrafluoroethylene material, or other materials, which can be selected according to actual needs.
[0052] In this embodiment, the discharge area of the ionization humidity measurement component is composed of a first electrode structure and a second electrode structure. A sufficiently high voltage is applied to the two electrode structures to ionize the gas molecules between the electrode structures, but this voltage is often as high as several hundred or even thousands of volts. Therefore, it is necessary to provide a nano-semiconductor layer at the ends of the first electrode structure and the second electrode structure, and to reduce the distance between the two electrode structures to 8um to 12um to ensure the safety of the ionization humidity measurement component and achieve portability.
[0053] For example, in this embodiment, the nano semiconductor layer 134 is a P-type CuO nanowire. Figure 3 Shown is a schematic diagram of the morphology of P-type CuO nanowires, which are similar to the thorn structure of the cathode of an electrostatic precipitator, and can effectively reduce the discharge voltage to ensure its safety and low power consumption.
[0054] For example, Figure 2 As shown, the inner side wall of the housing 131 is provided with a first groove, and the first electrode structure 132 includes a first metal plate 132a, a first silicon column 132b and a first nano-semiconductor layer 132c. The first metal plate 132a is provided in the first groove, the first end of the first silicon column 132b is connected to the first metal plate 132a, and the second end of the first silicon column 132b is connected to the first nano-semiconductor layer 132c.
[0055] In this embodiment, the first metal plate 132 a is a metal copper plate, and the first metal plate 132 a serves as a positive electrode.
[0056] For example, Figure 2As shown, the inner wall of the housing 131 is provided with a second groove, and the second electrode structure 132 includes a second metal plate 133a, a second silicon pillar 133b and a second nano-semiconductor layer 133c. The second metal plate 133a is provided in the second groove,
[0057] A first end of the second silicon pillar 133 b is connected to the second metal plate 133 a , and a second end of the second silicon pillar 133 b is connected to the second nano-semiconductor layer 133 c .
[0058] In this embodiment, the second metal plate 133 a is a metal copper plate, and the second metal plate 133 a serves as a negative electrode.
[0059] In this embodiment, the distance between the second silicon pillars 133 b and the second silicon pillars 133 b is controlled to be 10 um.
[0060] Specifically, in this embodiment, the preparation process of the ionization humidity measurement component 130 can be as follows:
[0061] A first groove and a second groove are respectively provided on the inner side wall of the polytetrafluoroethylene casing 131, and a first metal plate 132a and a second metal plate 133a are respectively embedded in the first groove and the second groove as positive and negative electrodes, and a first silicon column 132b and a second silicon column 133b are respectively bonded on the surface of the first metal plate 132a and the second metal plate 133a by nano silver paste, and the distance between the two silicon columns is controlled to be 10um. Subsequently, a copper film is respectively plated on the surface of the first silicon column 132b and the second silicon column 133b as a seed layer, and immersed in an aqueous solution composed of sodium hydroxide and ammonium persulfate for 10 minutes to generate copper oxide nanowires, and the residual solution is washed and dried to obtain a dark brown P-type CuO nanowire, so as to form a first nano semiconductor layer 132c and a second nano semiconductor layer 133c at the ends of the first silicon column 132b and the second silicon column 133b, respectively, to complete the preparation of the ionization humidity measurement component 130.
[0062] The flue gas humidity measuring device 100 based on the ionization principle of the disclosed embodiment follows the Townsend discharge principle. When the voltage is low, the free charges between the electrodes move in a directional manner to form a weak current (first stage). As the voltage continues to increase, the original free electrons and cathode field-emitted electrons obtain sufficient energy to bombard the anode and gas molecules, generating a large number of charged particles, and the current increases rapidly (second stage). When the voltage is high enough, the cations also obtain sufficient energy to bombard the cathode and gas molecules, and the number of charged particles in the space increases avalanche-like. At this time, the IV characteristic approximates a straight line parallel to the y-axis, and spark discharge occurs (third stage). The operating voltage selection range of the ionization sensor is between the second and third stages, and no spark discharge will occur. In addition, the stable chemical properties of the semiconductor CuO make the flue gas humidity measuring device extremely long in life.
[0063] In this embodiment, the smoke humidity measuring device based on the ionization principle determines the relative humidity by comparing the current values of dry smoke and wet smoke at the same voltage. Water molecules will be ionized under a certain voltage, and the anions and cations will move in a directional manner to form a current. Compared with dry smoke, the current value of wet smoke is higher; compared with smoke with low relative humidity, smoke with high relative humidity can ionize more water molecules, so the current value will be higher, thereby achieving the purpose of determining the relative humidity of smoke through the current value of the analyzer.
[0064] For example, Figure 1 As shown, the smoke sampling assembly 110 includes a sampling head 111 , a smoke channel 112 and a heating element.
[0065] The first end of the sampling head 111 is used to insert into the side hole of the dust collector flue for sampling, and the second end of the sampling head 111 is connected to the first end of the smoke channel 112. In this embodiment, the smoke sampling assembly 110 can be a heatable smoke sampling gun.
[0066] The heating element is disposed at the second end of the smoke channel 112, and is used to heat the collected smoke. The heating element may be a microwave heating element, as long as it can heat the smoke to remove moisture from the smoke. The specific type of the heating element is not specifically limited, and can be selected according to actual needs.
[0067] Exemplarily, the flue gas humidity measuring device 100 based on the ionization principle further includes a processor, and the processor is electrically connected to the ionization humidity measuring component 130 .
[0068] The processor is used to obtain the smoke humidity by ionizing the water vapor in the smoke at a preset voltage to obtain a corresponding current value.
[0069] In this embodiment, the processor can automatically process the current generated by the ionization humidity measurement component when ionizing the flue gas, and directly obtain the corresponding flue gas humidity. There is no need to manually look up the corresponding table of the relationship between current and flue gas humidity, and the flue gas humidity can be obtained more conveniently and quickly.
[0070] For example, Figure 1 As shown, the flue gas humidity measuring device 100 based on the ionization principle further includes a handle 140, which is connected to the ionization humidity measuring component 130. Specifically, the handle 140 is connected to the housing 131 in the ionization humidity measuring component 130, which can facilitate the collection of smoke in the dust collector.
[0071] like Figure 4As shown, another aspect of the embodiment of the present disclosure provides a flue gas humidity measurement method S100 based on the ionization principle, which is applied to the dust collector of a thermal power plant, and is measured using the flue gas humidity measurement device 100 based on the ionization principle described above. The specific structural features of the flue gas humidity measurement device 100 based on the ionization principle have been described in detail above, and will not be repeated here. Among them, the humidity measurement method S100 includes:
[0072] S110. Collect smoke in a flue of a dust collector of a thermal power plant through a smoke sampling component.
[0073] Specifically, the sampling head 111 of the smoke sampling assembly 110 is inserted into the side hole of the flue of the dust collector of the thermal power plant to collect smoke.
[0074] S120, filtering the collected smoke through a smoke filter to obtain smoke containing water vapor.
[0075] Specifically, the smoke collected by the smoke sampling component 110 enters the smoke filter 120 through the smoke channel 112, and the smoke is filtered by the smoke filter 120 to obtain smoke containing water vapor.
[0076] S30, ionizing the flue gas containing water vapor by using an ionization humidity measurement component to obtain a corresponding current value, and obtaining the flue gas humidity according to the current value.
[0077] Specifically, the first electrode structure 132 and the second electrode structure 133 ionize the flue gas containing water vapor to obtain a corresponding current value, and obtain the humidity of the flue gas according to the current value.
[0078] Wherein, under a preset voltage, the ionization humidity measurement component 130 ionizes the water vapor in the water vapor-containing flue gas to obtain a first current value. Specifically, a preset constant voltage is applied to the first electrode structure 132 and the second electrode structure 133, and the first electrode structure 132 and the second electrode structure 133 ionize the water vapor in the flue gas to obtain a first current value.
[0079] The collected smoke is heated to a preset temperature, and the ionization humidity measurement component 130 ionizes the dry smoke to obtain a second current value. Specifically, the collected smoke is heated by the heating element in the smoke sampling component 110. When the heating temperature reaches the preset temperature, the second current value generated by the first electrode structure 132 and the second electrode structure 133 will stabilize to a fixed value, at which time the water vapor in the smoke disappears, and the current value in the dry smoke is measured.
[0080] The relative humidity of the flue gas can be calculated based on the current difference between the first current value and the second current value.
[0081] Specifically, the smoke humidity measuring device based on the ionization principle determines the relative humidity by comparing the current values of dry smoke and wet smoke at the same voltage. Water molecules will be ionized under a certain voltage, and anions and cations will move in a directional manner to form a current. Compared with dry smoke, the current value of wet smoke is higher; compared with smoke with low relative humidity, smoke with high relative humidity can ionize more water molecules, so the current value will be higher, thereby achieving the purpose of determining the relative humidity of smoke by the current value generated by ionization of the first electrode structure and the second electrode structure.
[0082] The flue gas humidity measurement method based on the ionization principle provided by the embodiment of the present disclosure ionizes the water vapor-containing flue gas through the ionization humidity measurement component to obtain the corresponding current value, and obtains the flue gas humidity according to the current value, which solves the defects of the traditional dust collector flue gas humidity analyzer based on the working principle of the hygroscopic method, the dry-wet-bulb method and the condensation method, such as long measurement time, easy to be affected by the ambient temperature, large and complex volume, and poor stability. At the same time, it has the advantages of long life, convenient electrode replacement, and low cost. In particular, the measuring device can be directly combined with the existing heatable smoke sampling gun, which greatly improves the convenience of data acquisition.
[0083] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the embodiments of the present disclosure, but the embodiments of the present disclosure are not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of the present disclosure, and these modifications and improvements are also considered to be within the protection scope of the embodiments of the present disclosure.
Claims
1. A flue gas humidity measuring device based on the ionization principle, applied to the dust collector of a thermal power plant, characterized in that: include: The smoke sampling assembly is used to collect smoke in the flue of the dust collector of a thermal power plant; A smoke filter connected to the smoke sampling assembly and used to filter the collected smoke to obtain smoke containing water vapor; The ionization humidity measurement component is connected to the smoke filter and is used to ionize the water vapor-containing smoke at a preset voltage to obtain a corresponding current value, and obtain the smoke humidity according to the current value.
2. The device according to claim 1, characterized in that The ionization humidity measurement assembly comprises a shell, a first electrode structure and a second electrode structure arranged on the shell; The first electrode structure and the second electrode structure are relatively distributed, and the distance between them ranges from 8um to 12um; The ends of the first electrode structure and the second electrode structure are both provided with nano-semiconductor layers.
3. The device according to claim 2, characterized in that The nano semiconductor layer is P-type CuO nanowire.
4. The device according to claim 2, characterized in that The inner side wall of the shell is provided with a first groove; The first electrode structure includes a first metal plate, a first silicon pillar and a first nano-semiconductor layer; wherein, The first metal plate is disposed in the first groove; A first end of the first silicon column is connected to the first metal plate, and a second end of the first silicon column is connected to the first nano-semiconductor layer.
5. The device according to claim 4, characterized in that The inner side wall of the shell is provided with a second groove; The second electrode structure includes a second metal plate, a second silicon pillar and a second nano-semiconductor layer; wherein, The second metal plate is disposed in the second groove; A first end of the second silicon column is connected to the second metal plate, and a second end of the second silicon column is connected to the second nano-semiconductor layer.
6. The device according to claim 5, characterized in that The first metal plate and the second metal plate are both metal copper plates.
7. The device according to any one of claims 1 to 6, characterized in that The smoke sampling assembly includes a sampling head, a smoke channel and a heating element; The first end of the sampling head is used to insert into the side hole of the dust collector flue for sampling, and the second end of the sampling head is connected to the first end of the smoke channel; The heating element is arranged at the second end of the smoke channel and is used for heating the collected smoke.
8. The device according to any one of claims 1 to 6, characterized in that Also included is a processor, the processor being electrically connected to the ionization humidity measurement component; The processor is used to obtain smoke humidity by ionizing water vapor in the smoke at a preset voltage to obtain a corresponding current value.
9. The device according to any one of claims 1 to 6, characterized in that: Also includes a handle; The handle is connected to the ionization humidity measurement component.
10. A flue gas humidity measurement method based on the ionization principle, applied to the dust collector of a thermal power plant, characterized in that: The measurement is performed using the flue gas humidity measuring device based on the ionization principle as described in any one of claims 1 to 9; the method comprises: The smoke sampling component is used to collect smoke in the flue of the dust collector of the thermal power plant; The collected smoke is filtered through the smoke filter to obtain smoke containing water vapor; The water vapor-containing flue gas is ionized by the ionization humidity measurement component to obtain a corresponding current value, and the flue gas humidity is obtained according to the current value; wherein, Under a preset voltage, the ionization humidity measurement component ionizes water vapor in the water vapor-containing flue gas to obtain a first current value; The collected smoke is heated to a preset temperature, and the ionization humidity measurement component ionizes the dry smoke to obtain a second current value; The smoke humidity is obtained according to a current difference between the first current value and the second current value.