CN110631887A - Front gas dilution device for precision instrument measurement - Google Patents
Front gas dilution device for precision instrument measurement Download PDFInfo
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- CN110631887A CN110631887A CN201911053043.5A CN201911053043A CN110631887A CN 110631887 A CN110631887 A CN 110631887A CN 201911053043 A CN201911053043 A CN 201911053043A CN 110631887 A CN110631887 A CN 110631887A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
Abstract
The invention discloses a preposed gas diluting device for precise instrument measurement, which comprises: the gas mixing chamber is used for mixing two or more gases and diluting the gas to be measured into the measuring range of the measuring instrument; the tail end of the first gas channel is communicated with the gas mixing chamber and is used for conveying the first gas into the gas mixing chamber; the tail end of the second gas channel is communicated with the gas mixing chamber and is used for conveying a second gas into the gas mixing chamber; the first gas and the second gas are mixed in a gas mixing chamber. According to the invention, the cooling unit in the first gas channel and the filtering and absorbing unit in the first gas channel are used for cooling and filtering the high-temperature, high-dust and water vapor-containing flue gas. The isothermal isobaric chambers of the first gas channel and the second gas channel ensure that the two gases have the same initial state before dilution and mixing.
Description
Technical Field
The invention relates to a gas diluting device, in particular to a gas diluting device which can be used under high-temperature and high-dust gas.
Background
In a large coal-fired power plant boiler, the composition of the flue gas in a hearth is researched, and the analysis and the judgment of the high-temperature corrosion of a water-cooled wall are facilitated;
the method is beneficial to knowing the generation rule of the nitrogen oxide in the hearth and adding and controlling;
the method is helpful for understanding the combustion process of the pulverized coal, so as to guide a reasonable air distribution mode to improve the burnout of the pulverized coal.
However, as a result of the large percentage of carbon monoxide in the flue gas generated in the fire zone of the furnace, it may be as high as a dozen percent. The measuring range of the low-range carbon monoxide sensor is 0-10000ppm generally, the concentration of carbon monoxide in smoke components far exceeds the measuring range of the low-range carbon monoxide sensor, and the cost of the measuring instrument is increased by adopting the high-range carbon monoxide sensor.
In order to be able to reduce the test costs, it is necessary to dilute the carbon monoxide in the flue gas to within the measurement range of the low range carbon monoxide sensor.
The flue gas that pulverized coal burning generated is in the negative pressure state, has characteristics such as high temperature, high dust, moisture steam, adopts current gas diluting device to cause the damage of equipment easily.
Therefore, it is desirable to provide a pre-gas dilution device for precision instrumental measurements that solves the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a preposed gas diluting device for precise instrument measurement, which is suitable for diluting flue gas generated by burning pulverized coal, and the flue gas has the characteristics of high temperature, high dust and water vapor.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a pre-gas dilution apparatus for precision instrument measurements, comprising:
the gas mixing chamber is used for mixing two or more gases and diluting the gas to be measured into the measuring range of the measuring instrument;
the tail end of the first gas channel is communicated with the gas mixing chamber and is used for conveying the first gas into the gas mixing chamber;
the tail end of the second gas channel is communicated with the gas mixing chamber and is used for conveying a second gas into the gas mixing chamber;
the first gas and the second gas are mixed in a gas mixing chamber.
As a further improvement of the present invention, the first gas in the first gas channel is a diluted gas to be measured; the second gas in the second gas channel is a diluent gas.
As a further improvement of the invention, the diluted gas is furnace flue gas, and the diluent gas is air or pure nitrogen.
As a further improvement of the invention, the first gas channel comprises a first gas channel cooling unit, a first gas channel filtering and absorbing unit, a first gas channel membrane pump, a first gas channel gas isothermal isobaric chamber and a first gas channel volumetric flowmeter which are sequentially communicated;
the outlet of the first gas passage volumetric flowmeter is communicated with the gas mixing chamber;
the first gas channel cooling unit is provided with a first gas channel gas inlet and a first gas channel cooling unit liquid outlet;
the flue gas in the furnace enters a pipeline of the first gas channel cooling unit from a gas inlet of the first gas channel, is cooled by cooling liquid in the first gas channel cooling unit and then enters the first gas channel filtering and absorbing unit;
and the liquid outlet of the first gas channel cooling unit is used for discharging the cooling liquid in the first gas channel cooling unit.
As a further improvement of the invention, the first gas channel cooling unit is externally provided with radiating fins, the cooling liquid in the first gas channel cooling unit is medium water, and the flue gas pipeline in the first gas channel cooling unit is immersed in the medium water in a serpentine curve mode.
As a further improvement of the invention, the second gas channel comprises a second gas channel filtering and absorbing unit, a second gas channel membrane pump, a second gas channel gas isothermal pressure chamber and a second gas channel volumetric flowmeter which are sequentially communicated;
the outlet of the second gas passage volumetric flowmeter is communicated with the gas mixing chamber;
a second gas channel gas inlet is formed in the filtering and absorbing unit;
and the air or pure nitrogen enters the filtering and absorbing unit from the gas inlet of the second gas channel.
As a further improvement of the invention, the first gas channel filtering and absorbing unit and the second gas channel filtering and absorbing unit are transparent containers in which allochroic silica gel and white high-efficiency filter cotton are placed, and the allochroic silica gel and the white high-efficiency filter cotton are used for absorbing water in gas and filtering dust in the gas.
As a further improvement of the present invention, the first gas channel gas isothermal isobaric chamber and the second gas channel gas isothermal isobaric chamber are used for enabling two paths of gas to be under the same pressure and temperature conditions, the pressure of the first gas channel is realized by controlling the start and stop of the first gas channel thin film pump through the first gas channel pressure measurement feedback device, and the pressure of the second gas channel is realized by controlling the start and stop of the second gas channel thin film pump through the second gas channel pressure measurement feedback device;
the first gas channel gas isothermal isobaric chamber and the second gas channel gas isothermal isobaric chamber are immersed in normal-temperature liquid, so that temperature control is realized.
As a further improvement of the present invention, the first gas channel filtering and absorbing unit comprises a container body, a vapor and dust settling chamber, a vapor absorbing chamber and a dust filtering chamber which are arranged inside the container body, a gas inlet which is arranged at one side of the container body and is communicated with the vapor and dust settling chamber, and a gas outlet which is arranged at the other side of the container body and is communicated with the dust filtering chamber;
the upper part between the water vapor and dust settling chamber and the water vapor absorption chamber is communicated, and the upper part between the water vapor absorption chamber and the dust filter chamber is communicated.
The first gas channel filtering and absorbing unit and the second gas channel filtering and absorbing unit have the same structure.
As a further improvement of the invention, the bottom of the container body is provided with a impurity discharging port communicated with the vapor and dust settling chamber for discharging the vapor and impurities in the dust settling chamber;
the water vapor absorption chamber is filled with a water vapor absorption medium, and the height of the water vapor absorption medium is lower than the communication position of the water vapor and dust precipitation chamber and the water vapor absorption chamber;
the top of the container body is provided with a water vapor absorption chamber absorption medium inlet and outlet which are communicated with the water vapor absorption chamber;
and a filter cylinder is arranged in the dust filter chamber.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, the cooling unit in the first gas channel and the filtering and absorbing unit in the first gas channel are used for cooling and filtering the high-temperature, high-dust and water vapor-containing flue gas. The isothermal isobaric chambers of the first gas channel and the second gas channel ensure that the two gases have the same initial state before dilution and mixing.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic cross-sectional view of the filtration and absorption unit of the present invention;
wherein 1 a first gas channel gas inlet;
2 a first gas channel cooling unit;
3 a liquid outlet of the first gas channel cooling unit;
4 a first gas channel filtering and absorbing unit;
5 a first gas channel membrane pump;
6 a first gas channel pressure measurement feedback device;
7 a first gas channel gas isothermal isobaric chamber;
8 a first gas passage volumetric flow meter;
9 a gas mixing chamber;
10 mixed gas outlet;
11 a second gas passage volumetric flow meter;
12 a second gas channel gas isothermal isobaric chamber;
13 a second gas channel pressure measurement feedback device;
14 a second gas channel filtering and absorbing unit;
15 second gas channel gas inlet;
16 a second gas channel membrane pump;
17 a gas inlet;
18 water vapor and dust settling chamber;
19 a water vapor absorption chamber;
20 an absorbing medium inlet and outlet of the water vapor absorbing chamber;
21 dust filtering chamber;
22 a filter cartridge;
23 a gas outlet;
24 a water vapor absorbing medium;
25 trash discharge ports.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
Example one
As shown in figures 1 and 2 of the drawings,
a pre-gas dilution apparatus for precision instrument measurements, comprising:
the gas mixing chamber 9 is used for mixing two or more gases and diluting the gas to be measured into the measuring range of the measuring instrument;
a first gas channel, the end of which is communicated with the gas mixing chamber 9 and is used for conveying the first gas into the gas mixing chamber 9;
a second gas channel, the end of which is communicated with the gas mixing chamber 9 and is used for conveying a second gas into the gas mixing chamber 9;
the first gas and the second gas are mixed in the gas mixing chamber 9.
Further, the first gas in the first gas channel is diluted gas to be measured; the second gas in the second gas channel is a diluent gas.
Further, the diluted gas is flue gas in the furnace, and the diluted gas is air.
Further, the first gas channel comprises a first gas channel cooling unit 2, a first gas channel filtering and absorbing unit 4, a first gas channel membrane pump 5, a first gas channel gas isothermal isobaric chamber 7 and a first gas channel volumetric flowmeter 8 which are sequentially communicated;
the outlet of the first gas channel volumetric flowmeter 8 is communicated with a gas mixing chamber 9;
the first gas channel cooling unit 2 is provided with a first gas channel gas inlet 1 and a first gas channel cooling unit liquid outlet 3;
furnace flue gas enters a pipeline of a first gas channel cooling unit 2 from a first gas channel gas inlet 1, is cooled by cooling liquid in the first gas channel cooling unit 2 and then enters a first gas channel filtering and absorbing unit 4;
the first gas passage cooling unit liquid discharge port 3 is used for discharging the cooling liquid in the first gas passage cooling unit 2.
Further, the outside of the first gas channel cooling unit 2 is provided with heat radiating fins, the cooling liquid inside the first gas channel cooling unit is medium water, and the flue gas pipeline inside the first gas channel cooling unit is immersed in the medium water in a serpentine curve mode.
Further, the second gas channel comprises a second gas channel filtering and absorbing unit 14, a second gas channel membrane pump 16, a second gas channel gas isothermal equal-pressure chamber 12 and a second gas channel volumetric flowmeter 11 which are sequentially communicated;
the outlet of the second gas passage volumetric flowmeter 11 is communicated with the gas mixing chamber 9;
the filtering and absorbing unit 14 is provided with a second gas channel gas inlet 15;
the air or pure nitrogen gas enters the filtering and absorbing unit 14 from the second gas channel gas inlet 15.
Further, first gas passage filters absorption unit 4 and second gas passage and filters absorption unit 14 and for the transparent container that inside placed color-changing silica gel and white high efficiency filter cotton, color-changing silica gel and white high efficiency filter cotton are arranged in absorbing the moisture in the gas and filtering dust in the gas.
Further, the first gas channel gas isothermal isobaric chamber 7 and the second gas channel gas isothermal isobaric chamber 12 are used for enabling two paths of gas to be under the same pressure and temperature conditions, the pressure of the first gas channel is realized by controlling the starting and stopping of the first gas channel film pump 5 through the first gas channel pressure measurement feedback device 6, and the pressure of the second gas channel is realized by controlling the starting and stopping of the second gas channel film pump 16 through the second gas channel pressure measurement feedback device 13;
the first gas channel gas isothermal equal-pressure chamber 7 and the second gas channel gas isothermal equal-pressure chamber 12 are immersed in normal-temperature liquid, so that temperature control is realized.
Further, the first gas channel filtering and absorbing unit 4 comprises a container body, a vapor and dust settling chamber 18, a vapor absorbing chamber 19 and a dust filtering chamber 21 which are arranged inside the container body, a gas inlet 17 which is arranged at one side of the container body and is communicated with the vapor and dust settling chamber 18, and a gas outlet 23 which is arranged at the other side of the container body and is communicated with the dust filtering chamber 21;
the upper part of the vapor and dust settling chamber 18 is communicated with the vapor absorption chamber 19, and the upper part of the vapor absorption chamber 19 is communicated with the dust filter chamber 21.
The first gas passage filtering and adsorbing unit 4 and the second gas passage filtering and adsorbing unit 14 have the same structure.
Example two
As shown in figures 1 and 2 of the drawings,
a pre-gas dilution apparatus for precision instrument measurements, comprising:
the gas mixing chamber 9 is used for mixing two or more gases and diluting the gas to be measured into the measuring range of the measuring instrument;
a first gas channel, the end of which is communicated with the gas mixing chamber 9 and is used for conveying the first gas into the gas mixing chamber 9;
a second gas channel, the end of which is communicated with the gas mixing chamber 9 and is used for conveying a second gas into the gas mixing chamber 9;
the first gas and the second gas are mixed in the gas mixing chamber 9.
Further, the first gas in the first gas channel is diluted gas to be measured; the second gas in the second gas channel is a diluent gas.
Further, the diluted gas is furnace flue gas, and the diluted gas is pure nitrogen.
Further, the first gas channel comprises a first gas channel cooling unit 2, a first gas channel filtering and absorbing unit 4, a first gas channel membrane pump 5, a first gas channel gas isothermal isobaric chamber 7 and a first gas channel volumetric flowmeter 8 which are sequentially communicated;
the outlet of the first gas channel volumetric flowmeter 8 is communicated with a gas mixing chamber 9;
the first gas channel cooling unit 2 is provided with a first gas channel gas inlet 1 and a first gas channel cooling unit liquid outlet 3;
furnace flue gas enters a pipeline of a first gas channel cooling unit 2 from a first gas channel gas inlet 1, is cooled by cooling liquid in the first gas channel cooling unit 2 and then enters a first gas channel filtering and absorbing unit 4;
the first gas passage cooling unit liquid discharge port 3 is used for discharging the cooling liquid in the first gas passage cooling unit 2.
Further, the outside of the first gas channel cooling unit 2 is provided with heat radiating fins, the cooling liquid inside the first gas channel cooling unit is medium water, and the flue gas pipeline inside the first gas channel cooling unit is immersed in the medium water in a serpentine curve mode.
Further, the second gas channel comprises a second gas channel filtering and absorbing unit 14, a second gas channel membrane pump 16, a second gas channel gas isothermal equal-pressure chamber 12 and a second gas channel volumetric flowmeter 11 which are sequentially communicated;
the outlet of the second gas passage volumetric flowmeter 11 is communicated with the gas mixing chamber 9;
the filtering and absorbing unit 14 is provided with a second gas channel gas inlet 15;
the air or pure nitrogen gas enters the filtering and absorbing unit 14 from the second gas channel gas inlet 15.
Further, first gas passage filters absorption unit 4 and second gas passage and filters absorption unit 14 and for the transparent container that inside placed color-changing silica gel and white high efficiency filter cotton, color-changing silica gel and white high efficiency filter cotton are arranged in absorbing the moisture in the gas and filtering dust in the gas.
Further, the first gas channel gas isothermal isobaric chamber 7 and the second gas channel gas isothermal isobaric chamber 12 are used for enabling two paths of gas to be under the same pressure and temperature conditions, the pressure of the first gas channel is realized by controlling the starting and stopping of the first gas channel film pump 5 through the first gas channel pressure measurement feedback device 6, and the pressure of the second gas channel is realized by controlling the starting and stopping of the second gas channel film pump 16 through the second gas channel pressure measurement feedback device 13;
the first gas channel gas isothermal equal-pressure chamber 7 and the second gas channel gas isothermal equal-pressure chamber 12 are immersed in normal-temperature liquid, so that temperature control is realized.
Further, the first gas channel filtering and absorbing unit 4 comprises a container body, a vapor and dust settling chamber 18, a vapor absorbing chamber 19 and a dust filtering chamber 21 which are arranged inside the container body, a gas inlet 17 which is arranged at one side of the container body and is communicated with the vapor and dust settling chamber 18, and a gas outlet 23 which is arranged at the other side of the container body and is communicated with the dust filtering chamber 21;
the upper part of the vapor and dust settling chamber 18 is communicated with the vapor absorption chamber 19, and the upper part of the vapor absorption chamber 19 is communicated with the dust filter chamber 21.
The first gas passage filtering and adsorbing unit 4 and the second gas passage filtering and adsorbing unit 14 have the same structure.
Further, container body bottom is provided with the communicating row miscellaneous mouth with steam and dust precipitation chamber 18 for the impurity in steam of discharging and the dust precipitation chamber 18 makes things convenient for the discharge and the collection of impurity, avoids the unable clearance of accumulated impurity to influence dust precipitation effect.
A water vapor absorbing medium 24 is filled in the water vapor absorbing chamber 19, and the height of the water vapor absorbing medium 24 is lower than the communication position of the water vapor and dust settling chamber 18 and the water vapor absorbing chamber 19; the vapor-absorbing medium 24 is prevented from blocking the channels and affecting the gas flow.
The top of the container body is provided with a water vapor absorption chamber absorption medium inlet and outlet 20 communicated with the water vapor absorption chamber 19; the addition and cleaning of the vapor absorbing medium 24 within the vapor absorbing chamber 19 is facilitated.
The dust filtering chamber 21 is internally provided with the filter cylinders 22, and two or more filter cylinders 22 can be arranged, so that the dust filtering effect is better.
The first embodiment and the second embodiment schematically disclose a preposed gas diluting device for precise instrument measurement, which works as follows: high-temperature, high-dust and water vapor-containing gas enters a first gas channel through a first gas channel gas inlet 1, passes through a cooling unit 2, a filtering and absorbing unit 4, a membrane pump 5, a gas isothermal isobaric chamber 7 and a volumetric flowmeter 8 and then enters a gas mixing chamber 9; the diluent gas enters the second gas channel through a second gas channel gas inlet 15, passes through a filtering and absorbing unit 14, a membrane pump 16, a gas isothermal pressure chamber 12 and a volumetric flow meter 11 and then enters the gas mixing chamber 9. After the two gases are fully mixed in the gas mixing type 9, the two gases are discharged from a mixed gas outlet 10 and enter a precision instrument for measurement.
According to the invention, the cooling unit in the first gas channel and the filtering and absorbing unit in the first gas channel are used for cooling and filtering the high-temperature, high-dust and water vapor-containing flue gas. The isothermal isobaric chambers of the first gas channel and the second gas channel ensure that the two gases have the same initial state before dilution and mixing.
The foregoing examples, while indicating preferred embodiments of the invention, are given by way of illustration and description, but are not intended to limit the invention solely thereto; it is specifically noted that those skilled in the art or others will be able to make local modifications within the system and to make modifications, changes, etc. between subsystems without departing from the structure of the present invention, and all such modifications, changes, etc. fall within the scope of the present invention.
Claims (10)
1. A pre-gas dilution apparatus for precision instrument measurements, comprising:
the gas mixing chamber (9) is used for mixing two or more gases and diluting the gas to be measured into the measuring range of the measuring instrument;
a first gas channel, the tail end of which is communicated with the gas mixing chamber (9) and is used for conveying the first gas into the gas mixing chamber (9);
a second gas channel, the tail end of which is communicated with the gas mixing chamber (9) and is used for conveying a second gas into the gas mixing chamber (9);
the first and second gases are mixed in a gas mixing chamber (9).
2. The pre-gas dilution device for precision instrumental measurements according to claim 1, wherein: the first gas in the first gas channel is diluted gas to be measured; the second gas in the second gas channel is a diluent gas.
3. The pre-gas dilution device for precision instrumental measurements according to claim 2, wherein: the diluted gas is furnace flue gas, and the diluted gas is air or pure nitrogen.
4. The pre-gas dilution device for precision instrumental measurements according to claim 3, wherein: the first gas channel comprises a first gas channel cooling unit (2), a first gas channel filtering and absorbing unit (4), a first gas channel membrane pump (5), a first gas channel gas isothermal isopipe (7) and a first gas channel volumetric flowmeter (8) which are sequentially communicated;
the outlet of the first gas channel positive displacement flowmeter (8) is communicated with a gas mixing chamber (9);
the first gas channel cooling unit (2) is provided with a first gas channel gas inlet (1) and a first gas channel cooling unit liquid outlet (3);
the flue gas in the furnace enters a pipeline of a first gas channel cooling unit (2) from a first gas channel gas inlet (1), is cooled by cooling liquid in the first gas channel cooling unit (2), and then enters a first gas channel filtering and absorbing unit (4);
and the first gas channel cooling unit liquid discharge port (3) is used for discharging cooling liquid in the first gas channel cooling unit (2).
5. The pre-gas dilution device for precision instrumental measurements according to claim 4, wherein: the first gas channel cooling unit (2) is externally provided with radiating fins, the cooling liquid in the first gas channel cooling unit is medium water, and the flue gas pipeline in the first gas channel cooling unit is immersed in the medium water in a serpentine curve mode.
6. The pre-gas dilution device for precision instrumental measurements according to claim 5, wherein: the second gas channel comprises a second gas channel filtering and absorbing unit (14), a second gas channel membrane pump (16), a second gas channel gas isothermal equal-pressure chamber (12) and a second gas channel volumetric flowmeter (11) which are sequentially communicated;
the outlet of the second gas channel positive displacement flowmeter (11) is communicated with a gas mixing chamber (9);
a second gas channel gas inlet (15) is arranged on the filtering and absorbing unit (14);
the air or pure nitrogen enters the filtering and absorbing unit (14) from a second gas channel gas inlet (15).
7. The pre-gas dilution device for precision instrumental measurements according to claim 6, wherein: first gas passage filters absorption unit (4) and second gas passage filters absorption unit (14) and places the transparent container of silica gel and white high efficiency filter cotton that discolours for inside, and silica gel and white high efficiency filter cotton that discolours are arranged in absorbing gas moisture and filtering gas dust.
8. The pre-gas dilution device for precision instrumental measurements according to claim 6, wherein: the first gas channel gas isothermal isobaric chamber (7) and the second gas channel gas isothermal isobaric chamber (12) are used for enabling two paths of gas to be under the same pressure and temperature conditions, the pressure of the first gas channel is achieved by controlling the starting and stopping of the first gas channel thin film pump (5) through the first gas channel pressure measurement feedback device (6), and the pressure of the second gas channel is achieved by controlling the starting and stopping of the second gas channel thin film pump (16) through the second gas channel pressure measurement feedback device (13);
the first gas channel gas isothermal isopipe (7) and the second gas channel gas isothermal isopipe (12) are immersed in normal temperature liquid, so as to realize temperature control.
9. A pre-gas dilution apparatus for precision instrumental measurements according to any one of claims 6 to 8, wherein: the first gas channel filtering and absorbing unit (4) comprises a container body, a water vapor and dust settling chamber (18), a water vapor absorbing chamber (19) and a dust filtering chamber (21) which are arranged in the container body, a gas inlet (17) which is arranged at one side of the container body and is communicated with the water vapor and dust settling chamber (18), and a gas outlet (23) which is arranged at the other side of the container body and is communicated with the dust filtering chamber (21);
the upper part between the water vapor and dust settling chamber (18) and the water vapor absorption chamber (19) is communicated, and the upper part between the water vapor absorption chamber (19) and the dust filter chamber (21) is communicated;
the first gas channel filtering and absorbing unit (4) and the second gas channel filtering and absorbing unit (14) have the same structure.
10. The pre-gas dilution device for precision instrumental measurements according to claim 9, wherein: the bottom of the container body is provided with a impurity discharging port communicated with the water vapor and dust settling chamber (18) and used for discharging water vapor and impurities in the dust settling chamber (18);
a water vapor absorbing medium (24) is filled in the water vapor absorbing chamber (19), and the height of the water vapor absorbing medium (24) is lower than the communication position of the water vapor and dust settling chamber (18) and the water vapor absorbing chamber (19);
the top of the container body is provided with a water vapor absorption chamber absorption medium inlet and outlet (20) which is communicated with the water vapor absorption chamber (19);
a filter cylinder (22) is arranged in the dust filter chamber (21).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113701185A (en) * | 2021-08-27 | 2021-11-26 | 国网河北省电力有限公司电力科学研究院 | Monitoring device and method for high-temperature corrosion degree of ultra-low emission power station boiler |
| CN115032339A (en) * | 2022-05-31 | 2022-09-09 | 中国矿业大学 | High-concentration flue gas dilution measuring device and method |
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| CN110631887B (en) | 2022-06-07 |
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