CN218035289U - Automatic air volume calibration system for SCR denitration catalyst abrasion test board - Google Patents

Abstract

The invention discloses an automatic air volume calibration system for an SCR denitration catalyst abrasion test board, which comprises: the supporting pipe is arranged in the pipeline; the micro-pressure meter is connected with the support pipe and used for detecting a pressure value on the inner section of the pipeline; the thermocouple is arranged in the pipeline and used for detecting the temperature value in the pipeline; and the controller is respectively connected with the micro-pressure meter and the thermocouple and is used for calculating the actual flow rate of the gas in the pipeline according to the pressure value and the temperature value. According to the invention, the flow velocity and the temperature of the air volume in the tube are obtained, so that the precise measurement of the flow velocity in the pipeline of the abrasion test bed is realized, the flow of the fan is adjusted in real time by comparing with the deviation of the set value of the air volume, and the accuracy of the abrasion strength test of the catalyst is improved.

Description

Automatic air volume calibration system for SCR denitration catalyst abrasion test board

Technical Field

The invention belongs to the field of treatment of atmospheric pollutants, and particularly relates to an automatic air volume calibration system for an SCR denitration catalyst abrasion test board.

Background

SCR denitration catalyst is SCR denitrification facility's core, and the dust can cause the wearing and tearing of catalyst to collapse in the flue gas, and mechanical properties's reduction can influence the performance of denitration chemical properties and the safe operation of unit. The abrasion strength detection is carried out before the SCR denitration catalyst leaves a factory, before regeneration and after regeneration, the mechanical strength of the catalyst in different stages can be effectively evaluated, and the mechanical strength detection can be used as a basis for product quality evaluation before installation and mechanical strength judgment before and after regeneration.

The technical specification (DL/T1286-2021) for testing the flue gas denitration catalyst of the thermal power plant specifies the preparation, test and calculation methods of the sample of the SCR denitration catalyst abrasion strength testing device. The flow velocity of detection media corresponding to different catalyst types is different, the flow velocity in the pore channel of the honeycomb catalyst is 14.5 +/-0.5 m/s, and the flow velocity in the pore channel of the flat-plate type catalyst and the corrugated-plate type catalyst is 10.5 +/-0.5 m/s. The concentration of the abradant is 50 +/-5 g/m < 3 >, and the total mass of the corresponding abradant is different under different flow rates. The flow rate required in the detection specification is the flow rate under the standard state, the accurate measurement of the flue gas flow is influenced by factors such as the ambient temperature and the uniformity of the flow cross section, and the flow can be quickly and accurately adjusted when different types of catalysts are tested, so that the flow rate in the catalyst pore channel can be ensured in real time.

Disclosure of Invention

The present invention is directed to solving, at least in part, one of the technical problems in the related art. Therefore, the embodiment of the invention provides an automatic air volume calibration system for an SCR denitration catalyst abrasion test bench.

This application first aspect provides an automatic calibration system of SCR denitration catalyst wear test platform amount of wind, includes:

a host tube disposed within a pipe;

the micro-pressure meter is connected with the supporting pipe and is used for detecting the pressure value on the inner section of the pipeline;

the thermocouple is arranged in the pipeline and used for detecting the temperature value in the pipeline;

and the controller is respectively connected with the micro-pressure meter and the thermocouple, and is used for calculating the actual flow rate of the gas in the pipeline according to the pressure value and the temperature value.

Further, the support tube comprises a plurality of support tubes which are respectively arranged at different positions in the pipeline.

Further, the host tube is a pitot tube.

Further, the plurality of pressure taps may include:

the first pressure measuring branch pipe is arranged on the upper wall of the pipeline;

a second pressure tap disposed at a central location of the pipe;

a third pressure tap disposed at a lower wall location of the conduit.

Further, the system further comprises:

a blower;

and one end of the air supply air channel is connected with the air blower, the other end of the air supply air channel is connected with the pipeline, and the air supply air channel is used for conveying air blown out by the air blower into the pipeline.

Drawings

Fig. 1 is a front sectional view of an air volume automatic calibration system of an SCR denitration catalyst abrasion test stand according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the automatic air volume calibration system of the SCR denitration catalyst abrasion test bench according to the embodiment of the invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

The following describes an air volume automatic calibration system of an SCR denitration catalyst abrasion test stand according to an embodiment of the present invention with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, the air volume automatic calibration system of the SCR denitration catalyst abrasion test bench according to the embodiment of the present invention includes:

a supporting tube 1, wherein the supporting tube 1 is arranged in a pipeline.

Wherein, the trusteeship 1 has a plurality of groups, and is arranged at different positions according to the specific structure of the pipeline. The material of the support tube 1 is not unique, and the support tube 1 can be a pitot tube, a backrest tube, a pitot tube and the like.

In one possible embodiment, the number of escrows is 5 groups, and the escrow is a pitot.

Optionally, the supporting tube 1 includes a plurality of pressure measuring branch tubes, including:

the first pressure branch pipe 11, the said first pressure branch pipe 11 is set up on the upper wall position of the pipeline;

a second pressure branch pipe 12, the second pressure branch pipe 12 being disposed at a central position of the pipe;

and a third pressure branch pipe 13, the third pressure branch pipe 13 being provided at a lower wall position of the pipe.

In the embodiment of the application, the pressure measuring branch pipe can be made of glass, plastic and the like, and is installed in a pipeline of the measured fluid to generate a pressure difference proportional to the flow rate, so that the micro-pressure meter can display the flow rate.

In one possible embodiment, the pressure measuring branch pipe is made of glass.

And the micro-pressure meter 2 is connected with the supporting pipe 1, and the micro-pressure meter 2 is used for detecting the pressure value on the inner section of the pipeline.

The micro-pressure meter 2 is used for measuring gas pressure values of different cross sections in the pipeline and different positions on the same cross section. The micro-pressure meter 2 can be a double-liquid U-shaped tube pressure meter, an inclined tube pressure meter, a compensation type micro-pressure meter, a digital micro-pressure meter and the like.

In one possible embodiment, the micro-manometer 2 is a digital micro-manometer.

Thermocouple 3, thermocouple 3 set up in the pipeline for detect the temperature value in the pipeline.

Wherein, the thermocouple 3 is a temperature sensing element, is a primary instrument, and the thermocouple 3 directly measures the temperature. The thermocouple is a closed loop formed by conductors made of 2 different components, and due to the fact that the materials are different, electron diffusion is generated by different electron densities, and electric potential is generated after the materials are stable and balanced. When gradient temperature exists at the two ends, current is generated in the loop to generate thermoelectromotive force, and the larger the temperature difference is, the larger the current is. The temperature value can be obtained after the thermoelectromotive force is measured.

The thermocouple 3 may be a nickel-chromium-nickel-silicon K-type thermocouple, a nickel-chromium-silicon-nickel-silicon-magnesium N-type thermocouple, a copper-nickel T-type thermocouple, or the like.

In a possible embodiment, the thermocouple 3 is a nickel chromium-nickel silicon K-type thermocouple.

And the controller 4 is respectively connected with the micro-pressure meter 2 and the thermocouple 3, and the controller 4 is used for calculating the actual flow rate of the gas in the pipeline according to the pressure value and the temperature value.

In the embodiment of the application, the controller 4 is a Programmable Logic Controller (PLC) and completes the instruction operation by receiving the pressure value of the micro-pressure gauge 2 and the temperature value of the thermocouple 3.

The controller 4 includes an air volume calculation program and a setting feedback program.

Wherein, the actual velocity of flow of gas in the pipeline is obtained according to temperature value and pressure value to air volume calculation procedure, combines gas density and pipeline area in the pipeline, includes:

acquiring the gas density, wherein the gas density acquisition process comprises the following steps:

where ρ is ₀ Is the density of air in the standard state, p ₀ Is standard atmospheric pressure, p _j T is the static pressure and the temperature value.

The process of obtaining the actual flow rate of the gas according to the gas density and the pressure value is as follows:

wherein v is the actual flow velocity, K is a calibration coefficient of a pitot tube, p is the mean value of pressure values at the pressure measuring branch pipe, and ρ is the gas density;

and a feedback module is set, the actual flow velocity is fed back to the fan control system, and the deviation of the actual flow velocity is compared with the deviation of the preset air volume value, so that the flow of the fan is adjusted in real time, wherein the fan control system comprises an air blower 5 and an air supply pipeline 6.

Wherein, different preset air volume values are set according to the types of the catalyst samples.

In one possible embodiment, the catalyst sample is a attrition-table honeycomb catalyst and the predetermined air flow value is:

v ₁ ＝14.5±0.5m/s；

in one possible embodiment, the catalyst samples are flat and corrugated catalysts, and the predetermined air flow values are:

v ₂ ＝10.5±0.5m/s。

as shown in fig. 1, the system for automatically calibrating the air volume of the SCR denitration catalyst abrasion test bench further includes:

and a blower 5.

Among them, conventional blowers include roots blowers, centrifugal blowers, rotary blowers, and the like. If the fan is classified according to pressure, the fan can be divided into a low pressure fan, a medium pressure fan and a high pressure fan. The pressure ranges are as follows: the total pressure H of the low pressure fan is less than or equal to 1000Pa, the medium pressure is 1000Pa less than or equal to 3000Pa, and the high pressure (centrifugal fan) is 3000Pa less than or equal to 15000Pa.

In a possible embodiment, the blower 5 is a low-pressure centrifugal blower.

And one end of the air supply duct 6 is connected with the air blower 5, the other end of the air supply duct 6 is connected with the pipeline, and the air supply duct 6 is used for conveying air blown out by the air blower into the pipeline.

According to the embodiment of the application, on the first hand, basic parameters for flow measurement are obtained through managed pressure measurement and thermocouple temperature measurement, accurate measurement of flow velocity in a pipeline of an abrasion test bed is achieved, on the second hand, basic parameters for flow measurement are fed back to a fan control system through a PLC (programmable logic controller) setting feedback program, fan flow is adjusted in real time through deviation comparison with an air flow set value, automatic calibration of fan air flow is achieved, and accuracy of catalyst abrasion strength testing is improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.

Although the above embodiments have been shown and described, it should be understood that they are exemplary and not intended to limit the invention, and that various changes, modifications, substitutions and alterations can be made herein by those skilled in the art without departing from the scope of the invention.

Claims (6)

1. The utility model provides an automatic calibration system of SCR denitration catalyst abrasion test platform amount of wind which characterized in that includes:

a host tube disposed within a pipe;

a micro-manometer connected to the support tube, the micro-manometer configured to detect a pressure value at an inner cross-section of the pipe;

the thermocouple is arranged in the pipeline and used for detecting the temperature value in the pipeline;

and the controller is respectively connected with the micro-pressure meter and the thermocouple, and is used for calculating the actual flow rate of the gas in the pipeline according to the pressure value and the temperature value.

2. The system of claim 1, wherein the host tube comprises a plurality of host tubes, each of the plurality of host tubes being disposed at a different location within the pipeline.

3. The system of claim 1 or 2, wherein the host tube is a pitot tube.

4. The system of claim 1, wherein the host tube comprises a plurality of pressure taps.

5. The system of claim 4, wherein the plurality of pressure taps comprises:

the first pressure measuring branch pipe is arranged on the upper wall of the pipeline;

a second pressure tap disposed at a central location of the pipe;

a third pressure tap disposed at a lower wall location of the duct.

6. The system of claim 1, further comprising:

a blower;

and one end of the air supply air channel is connected with the air blower, the other end of the air supply air channel is connected with the pipeline, and the air supply air channel is used for conveying air blown out by the air blower into the pipeline.

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