CN215174178U - Pressure measurement blowing device for high-temperature dust process gas pipeline - Google Patents
Pressure measurement blowing device for high-temperature dust process gas pipeline Download PDFInfo
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- CN215174178U CN215174178U CN202120082036.4U CN202120082036U CN215174178U CN 215174178 U CN215174178 U CN 215174178U CN 202120082036 U CN202120082036 U CN 202120082036U CN 215174178 U CN215174178 U CN 215174178U
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Abstract
The utility model discloses a pressure measurement gas blowing device for high temperature dust process gas pipeline belongs to high temperature pipeline pipe pressure measuring equipment, the utility model discloses the technical problem who solves avoids pipeline dust to block up measuring line and damage pressure test instrument for how realize the pressure measurement in the high temperature dust pipeline, and the technical scheme of adoption is: the structure of the device comprises a pressure guide pipeline, a blowing pipeline, an instrument air source interface, a mounting panel and a stand column, wherein a rotor flowmeter and a filtering pressure reducing valve are arranged on the mounting panel; one end of the blowing pipeline is communicated with an instrument air source interface, and the other end of the blowing pipeline is communicated with the pressure guide pipeline sequentially through the filtering and reducing valve and the rotor flowmeter; the installation panel and the stand are fixedly connected through a U-shaped clamp, a support is arranged at the upper end of the stand, a transmitter is arranged on the support and is communicated with one end of a pressure guide pipeline, and the other end of the pressure guide pipeline is used for communicating a high-temperature pipeline.
Description
Technical Field
The utility model relates to a high temperature pipeline pipe pressure measuring equipment, specifically speaking are pressure measurement gas blowing device for high temperature dust technology gas pipeline.
Background
In the pressure (differential pressure) measurement process in the high-temperature dust pipeline, the conventional method is that the pipeline root valve is connected with a condensation ring for direct measurement, and because a large amount of dust exists in the pipeline, the pressure measurement pipeline is easy to block, and because of high temperature in the pipeline, a large amount of toxic and harmful gas exists, and in the operation process of the equipment, the maintenance is difficult.
In recent years, with the continuous expansion of communication among petrochemical industries, an air blowing type pressure measuring device mainly based on the principle of constant flow of critical gas compression ratio is gradually adopted. The critical compression ratio constant flow principle means that when the pressure of a catalyst pipeline is measured, when the pressure of a pipeline medium is 0.528 times that of instrument gas, the pressure of the instrument gas is larger than the pressure of the pipeline medium, the instrument gas flows into the pipeline, and at the moment, if the flow is constant, the pressure of an instrument pipe is equal to the pressure of the measured pipeline (namely, the absolute pressure ratio of the instrument gas to process gas is 1.89 times). In order to realize the measurement of the principle, a constant-flow instrument gas source device is needed, and the current mainstream constant-flow instrument gas source device mainly comprises a flow-limiting orifice plate (the absolute pressure ratio of the front end and the rear end of the orifice plate is less than or equal to the critical compression ratio) and a constant-pressure-difference relay (the pressure flow at the two ends is constant). The two constant-current instrument gas source devices need clean instrument gas source gas and stable pressure, and pipeline dust is easy to block a measuring pipeline if the pressure fluctuates. Meanwhile, the temperature of the measured process gas is high, so that the pressure measuring instrument is easily damaged.
How to realize the pressure measurement in the high temperature dust pipeline, avoid pipeline dust to block up the measuring line and damage pressure test instrument is the problem that awaits a urgent solution at present.
Disclosure of Invention
The technical task of the utility model is to provide a pressure measurement gas blowing device for high temperature dust process gas pipeline solves the pressure measurement who how to realize in the high temperature dust pipeline, avoids pipeline dust to block up the problem of measuring the pipeline and damaging the pressure test instrument.
The technical task of the utility model is realized in the following way, a pressure measurement blowing device for high temperature dust process gas pipeline comprises a pressure guide pipeline, a blowing pipeline, an instrument gas source interface, an installation panel and a stand column, wherein the installation panel is provided with a rotor flow meter and a filtering pressure reducing valve; one end of the blowing pipeline is communicated with an instrument air source interface, and the other end of the blowing pipeline is communicated with the pressure guide pipeline sequentially through the filtering and reducing valve and the rotor flowmeter;
the installation panel and the stand are fixedly connected through a U-shaped clamp, a support is arranged at the upper end of the stand, a transmitter is arranged on the support and is communicated with one end of a pressure guide pipeline, and the other end of the pressure guide pipeline is used for communicating a high-temperature pipeline.
Preferably, a clamping sleeve joint is arranged at the joint of the blowing pipeline and the instrument air source interface.
Preferably, the U-shaped clips are provided with two U-shaped clips, and the two U-shaped clips are respectively positioned at the upper part and the lower part of the middle part of the installation panel.
Preferably, a filter is arranged on the filtering and pressure reducing valve; the rotameter is provided with a check valve.
Preferably, the communicating parts of the pressure guide pipeline, the air blowing pipeline and the high-temperature pipeline are provided with reducing clamping sleeve joints.
Preferably, when the pressure guide pipeline is arranged on one way, the transmitter adopts a pressure transmitter, the pressure transmitter is communicated with the pressure guide pipeline, and two valve groups are arranged at the communication position of the pressure transmitter and the pressure guide pipeline.
Preferably, the two valve banks comprise trip valve and blowoff valve, and the trip valve sets up on the pressure line, and the blowoff valve is located the trip valve front end and installs on the pressure line.
Preferably, when the pressure guide pipeline is provided with two paths, the transmitter adopts a differential pressure transmitter, the differential pressure transmitter is communicated with the two paths of pressure guide pipelines, and a five-valve group is arranged at the communication position of the differential pressure transmitter and the two paths of pressure guide pipelines.
Preferably, the five valve banks consist of two shut-off valves, two blowdown valves and a balance valve; wherein, two trip valves and two blowoff valves are installed respectively on two way pressure lines, and the balanced valve is located between two way pressure lines.
The utility model discloses a pressure measurement gas blowing device for high temperature dust technology gas pipeline has following advantage:
the installation panel has a simple, reasonable and compact installation structure, relatively low requirements on instrument air quality, pressure fluctuation and the like, and the pressure guide pipeline and the air blowing pipeline are connected by the clamping sleeve, so that the installation, the inspection and the maintenance are convenient; meanwhile, after reasonable installation and preheating of the air source pipe coil on the outer wall of the high-temperature pipeline, stress damage of instrument cold air and process hot air to pipeline joints and welded junctions can be effectively avoided, and the pipeline welding device is worthy of popularization and application;
the invention can complete the pressure measurement of any position of the high-temperature pipeline and the pressure difference measurement of any two positions of the high-temperature pipeline, and has complete functions and simple operation.
Therefore, the invention has the characteristics of reasonable design, simple structure, easy processing, small volume, convenient use, multiple purposes and the like, thereby having good popularization and use values.
Drawings
The present invention will be further explained with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of example 1;
FIG. 2 is a schematic view of the installation of embodiment 1;
FIG. 3 is a schematic view of the direction A of FIG. 2;
FIG. 4 is a schematic structural view of embodiment 2.
In the figure: 1. the device comprises an installation panel, 2, U-shaped clamps, 3, a support, 4, a two-valve group, 5, a rotor flowmeter, 6, a filtering and reducing valve, 7, a pressure transmitter, 8, a pressure guide pipeline, 9, an air blowing pipeline, 10, a stand column, 11, a reducing clamp sleeve joint, 12, a clamp sleeve joint, 13, a five-valve group, 14, a cut-off valve, 15, a blow-off valve, 16, a balance valve, 17, a differential pressure transmitter, 18, a high-temperature pipeline, 19, a process root valve, 20 and a heat insulation layer, wherein the installation panel is arranged on the installation panel; 21. instrument air supply interface, 22, check valve, 23, filter.
Detailed Description
The pressure measurement blowing device for the high-temperature dust process gas pipeline of the invention is described in detail below with reference to the attached drawings and specific embodiments of the specification.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and for simplification of 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 therefore not to be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
as shown in the attached drawing 1, the pressure measurement blowing device for the high-temperature dust process gas pipeline of the utility model comprises a pressure guide pipeline 8, a blowing pipeline 9, an instrument gas source interface 21, an installation panel 1 and a stand column 10, wherein the installation panel 1 is provided with a rotor flow meter 5 and a filtering and pressure reducing valve 6; wherein, the filter 23 is arranged on the filtering pressure reducing valve 6; the rotameter 5 is provided with a check valve 22. The communicating parts of the pressure guide pipeline 8, the air blowing pipeline 9 and the high temperature pipeline 18 are provided with reducing ferrule joints 11. One end of the blowing pipeline 9 is communicated with the instrument air source interface 21, and a clamping sleeve joint 12 is arranged at the joint of the blowing pipeline 9 and the instrument air source interface 21. The other end of the blowing pipeline 9 is communicated with the pressure guide pipeline 8 through the filtering and reducing valve 6 and the rotor flowmeter 5 in sequence; installation panel 1 and stand 10 are through U type checkpost 2 fixed connection, and U type checkpost 2 is equipped with two, and two U type checkposts 2 are located installation panel 1 middle part respectively and lean on the position that the middle part leaned on down. Support 3 is installed to the upper end of stand 10, installs pressure transmitter 7 on the support 3, and pressure transmitter 7 is linked together and pressure transmitter 7 and the department of leading and pressing pipeline 8 intercommunication install two valves 4 with the one end of leading pressing pipeline 8, and the other end of leading pressing pipeline 8 is used for communicateing high temperature tube 18. The two valve banks 4 are composed of a cut-off valve 14 and a blow-off valve 15, the cut-off valve 14 is installed on the pressure guide pipeline 8, and the blow-off valve 15 is located at the front end of the cut-off valve 14 and is installed on the pressure guide pipeline 8.
Practical cases: in a polymer resin company, process waste needs to be burnt, and the pressure of flue gas after burning needs to be measured.
The process conditions are as follows: the flue gas temperature is 400 ℃, the pressure is 20KPa, and the main components comprise acid gas, SO2, SO3, solid dust and the like. The aluminum silicate of the pipeline insulating layer 20 is not less than 200 mm.
The installation process is as follows, as shown in figures 2 and 3:
(1) the pressure taking point of the high-temperature pipeline 18 is opened at the upper part of the pipeline, a DN50 galvanized pipe is used for manufacturing an installation upright post 10, an installation panel 1 and a pressure transmitter 7 are fixed on the upright post 10, and the joint of an instrument air source interface 21 and an air blowing pipeline 9 is at least 500mm higher than the pressure taking point;
(2) and an instrument air pipe from the outside (
Stainless steel tube) to a filtering pressure reducing valve6 on the inlet ferrule fitting 12; then from the outlet of the glass tube rotameter 5, by
The stainless steel pipe is connected to a reducing clamp sleeve joint 11 (a three-way joint) beside the process root valve 19; the blowing pipeline 9 and a pressure taking port of the high-temperature pipeline 18 are horizontally arranged; before the blowing pipeline 9 is connected with the reducing ferrule connector 11, the blowing pipeline needs to be bent and laid on the wall of a high-temperature pipeline, the length of the blowing pipeline is not less than 2 meters, and the blowing pipeline aims to preheat an instrument air source by utilizing the temperature of the high-temperature pipeline 18, reduce the stress impact of cold air on a process root valve 19 and prevent cracking; reducing ferrule connector 11 for vertical side
The stainless steel pressure guide pipeline 8 is connected to the inlet of a shut-off valve 14 in the two valve groups 4 of the pressure transmitter 7, and pressure is guided into the pressure transmitter 7 through the two valve groups 4.
(II) running and debugging:
(1) setting all valves on the pressure guide pipeline 8 to be in a closed state, and purging the pipeline of the pressure guide pipeline 8 to prevent foreign matters from entering the pressure guide pipeline 8 if the pipeline clamping sleeve is firmly connected;
(2) because the pressure of the measured high-temperature pipeline 18 is 20KPa, the blowing pressure of the instrument gas source is 2 times of that of the process gas according to the gas critical compression ratio constant flow principle, firstly, the instrument gas source is connected, the filtering and reducing valve 6 is adjusted, and the blowing pressure of the instrument gas source is set to 40 KPa;
(3) the process root valve 19 of the high-temperature pipeline 18 and the glass tube rotameter 5 are sequentially opened, the instrument gas source enters the high-temperature pipeline 18, the flow of the rotameter 5 is adjusted to 20L/h, and at the moment, the establishment of the constant-flow gas source of the utility model is completed;
(4) and opening a stop valve 14 in the two valve groups 4 of the pressure transmitter 7, allowing the pressure of the pressure guide pipeline 8 to enter the pressure transmitter 7, setting the range to be 0-40KPa, uploading a 4-20mA analog quantity signal to a DCS (distributed control system), and realizing remote monitoring.
(III) common faults and maintenance methods:
the measuring pipe is blocked, the process root valve 19 is blocked, the rotor flow meter 5 has no flow, and the pressure value has no change:
(1) closing a cut-off valve 14 in a second valve group 4 of the pressure transmitter 7, adjusting the glass tube rotameter 5 to the maximum range, and slowly increasing the pressure of the filtering and reducing valve 6 until an instrument gas source enters a high-temperature pipeline 18 and the rotameter 5 indicates the flow;
(2) closing a process root valve 19, opening a blowdown valve 15 in a second valve group 4 of the pressure transmitter 7, purging dust in the pressure guide pipeline 8 by using an instrument gas source, and then closing the blowdown valve 15;
(3) and the outlet pressure of the filtering and reducing valve 6 is regulated back to 40KPa, the process root valve 19 is opened, the flow of the glass tube rotameter 5 is regulated to 20L/h, the shut-off valves 14 in the two valve groups 4 of the pressure transmitter 7 are opened, and the displayed pressure is the pressure of the high-temperature pipeline 18.
Example 2:
the difference between this example and example 1: as shown in fig. 4, when the pressure guiding pipeline 8 is provided with two paths, the transmitter adopts a differential pressure transmitter 17, the differential pressure transmitter 17 is communicated with the two paths of pressure guiding pipelines 8, and a five-valve set 13 is arranged at the communication position of the differential pressure transmitter 17 and the two paths of pressure guiding pipelines 8. The five-valve group 13 consists of two cut-off valves 14, two blowdown valves 15 and a balance valve 16; wherein, two trip valves 13 and two blowoff valves 14 are installed respectively on two way pressure pipeline 8, and balanced valve 16 is located between two way pressure pipeline 8. Two rotameters 5 are installed, and the two rotameters 5 are arranged in parallel.
Practical cases: measuring the front and back differential pressure of high-temperature flue gas through a catalyst packed tower
In a process of burning process waste materials by a combustion furnace, mixing high-temperature flue gas by a catalyst packed tower and mixing ammonia gas to carry out desulfurization and denitrification treatment, the pressure difference between the front and the back of the catalyst packed tower is measured and used for judging whether the catalyst packed tower is blocked or not.
The process conditions are as follows: the flue gas temperature is 380 ℃, the pipeline pressure is 15KPa, and the maximum pressure difference of 5KPa is allowed before and after the catalyst packed tower. The main components are acid gas, SO2, SO3, ammonia gas, catalyst and the like. The aluminum silicate of the pipeline insulating layer is not less than 200 mm.
The installation process of the differential pressure measurement (referring to the attached figure 2, installing two sets of pressure guide pipelines) is as follows:
(1) the pressure taking point of the high-temperature pipeline 18 is opened at the upper part of the pipeline, a DN50 galvanized pipe is used for manufacturing the installation upright post 10, the installation panel 1 and the differential pressure transmitter 17 are fixed on the installation upright post, and the instrument air source interface 21 is at least 500mm higher than the pressure taking point;
(2) and an instrument air pipe from the outside (
Stainless steel tube) is connected to the inlet bayonet fitting 12 of the filter pressure reducing valve 6; the outlets of the filtering and pressure reducing valves 6 are respectively connected with a "+" - "two sets of glass tube rotameters 5; then from the outlet of the "+" flowmeter
The stainless steel pipe is connected to a reducing clamp sleeve joint 11 (a three-way joint) beside a process root valve 19 at the inlet of the catalyst packed tower; the blowing pipeline 8 and the high-temperature pipeline 18 are horizontally arranged at a pressure taking port, the blowing pipeline 8 needs to be bent and laid on the wall of the high-temperature pipeline before being connected with the reducing ferrule joint 11, the length of the blowing pipeline is not less than 2 meters, and the purpose is to preheat an instrument air source by utilizing the temperature of the high-temperature pipeline 18, reduce the stress impact of cold air on the process root valve 19 and prevent cracking; reducing ferrule connector 11 for vertical side
Stainless steel pressure guide pipeline 8 is connected to the inlet of a cut-off valve 14 '+' in a five-valve set 13 of differential pressure transmitter 17, and pressure is guided into differential pressure transmitter 17 through the five-valve set 13; in the same way, the outlet of the minus rotor flowmeter 5 is connected to a reducing sleeve joint 11 on the horizontal side of a process root valve 19 at the outlet of the catalyst packed tower, and the vertical side of the reducing sleeve joint 11 is connected with an inlet of a cut-off valve 14 minus in a five-valve set 13 of a differential pressure transmitter 17.
And (II) operation debugging of differential pressure measurement:
(1) and the inlet of the catalyst packed tower is subjected to pressure debugging in a plus mode:
firstly, set up all valves on leading pressure pipeline 8 to the closed condition, whether the pipeline cutting ferrule is connected firmly sweeps leading pressure pipeline 8, prevents that there is the foreign matter to get into leading pressure pipeline 8.
Secondly, because the pressure of the measured high-temperature pipeline 18 is 15KPa, the blowing pressure of the instrument gas source needs to be 2 times of the process gas according to the gas critical compression ratio constant flow principle, the instrument gas source is firstly connected, the filtering and reducing valve 6 is adjusted, and the blowing pressure of the instrument gas source is set to 30 KPa.
And thirdly, opening a plus process root valve 19 and a plus glass tube rotameter 5 at the inlet of the catalyst packed tower in sequence, blowing the instrument gas source into a high-temperature pipeline 18, adjusting the flow of the rotameter 5 to 20L/h, and finishing the establishment of a constant flow gas source of a blowing device.
(2) The same principle is that: completing the mounting and debugging of the pressure at the outlet of the catalyst packed tower according to the steps;
(3) opening a balance valve 16 of five valve groups 13 of a differential pressure transmitter 17, and equalizing the pressure of a pressure chamber of the differential pressure transmitter 17 ' + ' - '; opening a '+' cut-off valve 14 of a five-valve set 13 of a differential pressure transmitter 17, and allowing the pipe pressure of a catalyst packed tower inlet '+' pressure guide pipeline 8 to enter the differential pressure transmitter 17; closing a balance valve 16, opening a '-' cut-off valve 14 of a five-valve group 13 of a differential pressure transmitter 17, and allowing the pressure of a catalyst packed tower outlet '-' pressure guide pipeline 8 to enter the differential pressure transmitter 17; the measuring range of the differential pressure transmitter 17 is set to be-10 KPa- +10KPa, 4-20mA analog quantity signals are uploaded to a DCS, and an alarm value is set to be 5KPa, so that remote monitoring is realized.
(III) common faults and maintenance methods:
the measuring pipe is blocked, the process root valve is blocked, the flow meter has no flow, and the differential pressure value does not change:
(1) and sequentially closing five valve groups 13 of a differential pressure transmitter 17, namely a "-" cut-off valve 14, a balance valve 16 and a "+" cut-off valve 15, respectively adjusting the "+" - "glass tube rotameter 5 to the maximum range, and slowly increasing the pressure 6 of the filtering and reducing valve until an instrument gas source enters a high-temperature pipeline 18, wherein the rotameter 5 indicates the flow.
(2) Closing the process root valve 19, opening a blowdown valve 15 in the five-valve group 13 of the differential pressure transmitter 17, blowing dust in the pressure guide pipeline 8 clean by instrument air source, and then closing the blowdown valve 15.
(3) And the pressure at the outlet of the filtering and reducing valve 6 is regulated back to 30KPa, and the filter is put into operation according to the operation debugging steps.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (9)
1. A pressure measurement blowing device for a high-temperature dust process gas pipeline is characterized by comprising a pressure guide pipeline, a blowing pipeline, an instrument gas source interface, a mounting panel and a stand column, wherein a rotor flow meter and a filtering pressure reducing valve are arranged on the mounting panel; one end of the blowing pipeline is communicated with an instrument air source interface, and the other end of the blowing pipeline is communicated with the pressure guide pipeline sequentially through the filtering and reducing valve and the rotor flowmeter;
the installation panel and the stand are fixedly connected through a U-shaped clamp, a support is arranged at the upper end of the stand, a transmitter is arranged on the support and is communicated with one end of a pressure guide pipeline, and the other end of the pressure guide pipeline is used for communicating a high-temperature pipeline.
2. The pressure measurement blowing device for the high-temperature dust process gas pipeline as claimed in claim 1, wherein a ferrule fitting is arranged at the connection position of the blowing pipeline and the instrument gas source interface.
3. The pressure measurement and air blowing device for the high-temperature dust process gas pipeline as claimed in claim 1 or 2, wherein two U-shaped clamps are arranged, and the two U-shaped clamps are respectively positioned at the positions of the middle part of the installation panel, which is close to the upper part, and the middle part of the installation panel, which is close to the lower part.
4. The pressure measurement blowing device for the high-temperature dust process gas pipeline as claimed in claim 3, wherein a filter is arranged on the filtering pressure reducing valve; the rotameter is provided with a check valve.
5. The pressure measurement blowing device for the high-temperature dust process gas pipeline as claimed in claim 4, wherein the pressure guide pipeline, the blowing pipeline and the high-temperature pipeline are provided with reducing ferrule joints at the communication positions.
6. The pressure measurement blowing device for the high-temperature dust process gas pipeline as claimed in claim 1, wherein when the pressure guide pipeline is arranged all the way, the transmitter is a pressure transmitter, the pressure transmitter is communicated with the pressure guide pipeline, and two valve groups are arranged at the communication position of the pressure transmitter and the pressure guide pipeline.
7. The pressure measurement blowing device for the high-temperature dust process gas pipeline according to claim 6, wherein the two valve sets comprise a stop valve and a blow-down valve, the stop valve is arranged on the pressure guiding pipeline, and the blow-down valve is positioned at the front end of the stop valve and is installed on the pressure guiding pipeline.
8. The pressure measurement blowing device for the high-temperature dust process gas pipeline according to claim 1, wherein when the pressure guide pipeline is provided with two paths, the transmitter adopts a differential pressure transmitter, the differential pressure transmitter is communicated with the two paths of pressure guide pipelines, and a five-valve group is arranged at the communication position of the differential pressure transmitter and the two paths of pressure guide pipelines.
9. The pressure measurement blowing device for the high-temperature dust process gas pipeline according to claim 8, wherein the five-valve set consists of two shut-off valves, two blowdown valves and one balance valve; wherein, two trip valves and two blowoff valves are installed respectively on two way pressure lines, and the balanced valve is located between two way pressure lines.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354054A (en) * | 2022-01-05 | 2022-04-15 | 东华工程科技股份有限公司 | Novel low-temperature corrosive gas online pressure or differential pressure continuous detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354054A (en) * | 2022-01-05 | 2022-04-15 | 东华工程科技股份有限公司 | Novel low-temperature corrosive gas online pressure or differential pressure continuous detection system |
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