CN220231651U

CN220231651U - Online analysis system for combustible or toxic gas in limited space

Info

Publication number: CN220231651U
Application number: CN202321598906.9U
Authority: CN
Inventors: 梅良兵; 於伟
Original assignee: CINIC CHEMICALS (SHANGHAI) CO LTD
Current assignee: CINIC CHEMICALS (SHANGHAI) CO LTD
Priority date: 2023-06-21
Filing date: 2023-06-21
Publication date: 2023-12-22
Anticipated expiration: 2033-06-21

Abstract

The utility model discloses an on-line analysis system for combustible or toxic gas in a limited space, which comprises: the sampling probe sets up in restricted space, the sampling valve, the gas-liquid separator, the aspiration pump, the filtration module, the detector, sample gas flowmeter and flame arrester are all located outside restricted space, sampling probe, gas-liquid separator and aspiration pump are established ties in proper order through a plurality of first pipelines and are formed the sampling branch road, the sampling valve sets up on the first pipeline between gas-liquid separator and the sampling probe, the aspiration pump, the filtration module, sample gas flowmeter, form the detection branch road through a plurality of second pipelines in proper order between the detector, the rear end of detector is provided with the emission branch road, the flame arrester sets up on the emission branch road. The system has the advantages that the sampling probe is arranged in the limited space, other structures are all arranged outside the limited space, the detection requirement can be met, the operation is simple and convenient, the maintenance amount is small, and the field use requirement is met.

Description

Online analysis system for combustible or toxic gas in limited space

Technical Field

The utility model relates to the technical field of flammable or toxic gas analysis, in particular to an online flammable or toxic gas analysis system in a limited space.

Background

When the device leaks, combustible gas and/or toxic gas heavier than air can accumulate in limited spaces such as poorly ventilated process valve wells, pits, sewage disposal ditches and the like, so that the production operation safety and the environmental safety are endangered. For most combustible gases, the gas is toxic when the gas concentration reaches 1% lel. In order to provide safety warning to operators, it is necessary to provide detectors in areas such as process valve wells, pits, and sewage disposal trenches where attention is required.

In the prior art, the flammable and toxic gas detector is arranged in the limited space, but when the flammable and toxic gas detector arranged in the limited space needs to be inspected or overhauled, the inspection is often omitted or the inspection is carried out again because of the complexity of the entering procedure of the limited space, so that the instrument and the device are in potential safety hazard.

Disclosure of Invention

In view of the foregoing problems in the prior art, it is an object of the present utility model to provide an online analysis system for flammable or toxic gases in a confined space.

The specific technical scheme is as follows:

an on-line analysis system for combustible or toxic gases in a confined space; mainly, mainly

Comprising the following steps: the device comprises a sampling probe, a sampling valve, a gas-liquid separator, an air pump, a filtering module, a detector, a sample gas flowmeter and a flame arrester;

the sampling probe is arranged in a limited space, the sampling valve, the gas-liquid separator, the air pump, the filtering module, the detector, the sample gas flowmeter and the flame arrester are all arranged outside the limited space, the sampling probe, the gas-liquid separator and the air pump are sequentially connected in series through a plurality of first pipelines to form a sampling branch, the sampling valve is arranged on the first pipeline between the gas-liquid separator and the sampling probe, the filtering module, the sample gas flowmeter and the detector are sequentially connected in series through a plurality of second pipelines to form a detection branch, the rear end of the detector is provided with a discharge branch, the flame arrester is arranged on the discharge branch, and the rear end of the sampling branch is connected with the front end of the detection branch.

The combustible or toxic gas on-line analysis system in the limited space is characterized by further comprising a flow regulating valve, a bleeding flowmeter and a bleeding loop valve, wherein the flow regulating valve, the bleeding flowmeter and the bleeding loop valve are sequentially connected in series through a plurality of third pipelines to form a bleeding branch, the flow regulating valve and the filtering module are arranged at the rear end of the air pump in parallel and are respectively connected with the air pump, the bleeding branch is arranged with the detection branch in parallel, and the rear end of the bleeding loop valve is connected with the discharge branch.

The above-mentioned in-line analysis system for combustible or toxic gas in a limited space is characterized in that the filter module includes a precision filter provided at a rear end of the air pump and connected to the air pump, and a membrane filter provided between the precision filter and the sample gas flow meter and connected to the precision filter and the sample gas flow meter.

In the above-mentioned flammable or toxic gas on-line analysis system in the limited space, there is also such a characteristic that a three-way switching valve is provided between the precision filter and the membrane filter, three ports of the three-way switching valve are respectively connected with the precision filter, the membrane filter and the calibration gas interface, and the three-way switching valve can realize selectively accessing the precision filter, the membrane filter and the calibration gas interface into the system.

In the above-mentioned on-line analysis system for combustible or toxic gas in a limited space, the rear end of the detector is provided with an exhaust pipeline, the front end of the exhaust pipeline is connected with the detector, the rear end of the exhaust pipeline is connected into the exhaust branch, and the exhaust pipeline is provided with a check valve.

The above-mentioned flammable or toxic gas on-line analysis system in the limited space is characterized in that the gas-liquid separator is provided with a liquid discharge branch, and the liquid discharge branch is provided with a liquid discharge valve.

The combustible or toxic gas on-line analysis system in the limited space also has the characteristic that the detector adopts the model number of GTQ-D610.

The above-mentioned on-line analysis system of combustible or toxic gas in the limited space also has the feature that the air pump is an explosion-proof air pump.

The technical scheme has the positive effects that:

the on-line analysis system for the combustible or toxic gas in the limited space provided by the utility model has the advantages that the sampling probe is arranged in the limited space, other structures including the detector are all arranged outside the limited space, the detection requirement can be met, the operation is simple and convenient, the maintenance amount is small, and the field use requirement is met to the maximum extent.

Drawings

FIG. 1 is a schematic diagram of an on-line analysis system for flammable or toxic gases in a confined space according to the present utility model.

In the accompanying drawings: 1. a sampling probe; 2. a sampling valve; 3. a gas-liquid separator; 4. an air extracting pump; 5. a flow regulating valve; 6. a precision filter; 7. a three-way switching valve; 8. a membrane filter; 9. a diffusing flowmeter; 10. a sample gas flow meter; 11. a detector; 12. a cabinet body; 13. a liquid outlet; 14. calibrating a gas interface; 15. a flame arrester; 16. a liquid discharge valve; 17. a check valve; 18. a bleeding circuit valve; A. limited space.

Detailed Description

The present utility model will be further described in detail below with reference to examples, which are provided to illustrate the objects, technical solutions and advantages of the present utility model. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The numbering of components herein, such as "first," "second," etc., is used merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated. In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Referring to fig. 1, there is shown an on-line analysis system for combustible or toxic gases in a confined space, comprising: the sampling probe 1, the sampling valve 2, the gas-liquid separator 3, the air pump 4, the filtering module, the detector 11, the sample gas flow meter 10 and the flame arrester 15;

the sampling probe 1 is arranged in the limited space A, the sampling valve 2, the gas-liquid separator 3, the air pump 4, the filtering module, the detector 11, the sample gas flow meter 10 and the flame arrester 15 are all arranged outside the limited space A, the sampling probe 1, the gas-liquid separator 3 and the air pump 4 are sequentially connected in series through a plurality of first pipelines to form a sampling branch, the sampling valve 2 is arranged on the first pipeline between the gas-liquid separator 3 and the sampling probe 1, the air pump 4, the filtering module, the sample gas flow meter 10 and the detector 11 are sequentially connected in series through a plurality of second pipelines to form a detection branch, the rear end of the detector 11 is provided with a discharge branch, and the flame arrester 15 is arranged on the discharge branch.

The sampling valve 2 is opened, the sampling probe 1 is used for sampling the sample gas in the limited space A, the gas-liquid separator 3 is used for gas-liquid separation, and then the gas after the gas is pumped by the air pump 4 and sequentially enters the filtering module, the sample gas flowmeter 10 and the detector 11 for detection, so that a detection result is obtained.

In this specification, all front and rear ends are defined in terms of the flow direction of the gas, for example, the front end of the gas-liquid separator 3 refers to the end into which the sample gas flows, the front end may refer to the inflow end of the gas-liquid separator 3 or a position on the first pipeline, the front end is actually a concept of orientation definition and does not necessarily need to be the structure of the gas-liquid separator 3 itself, the rear end of the gas-liquid separator 3 refers to the end from which the sample gas flows, the rear end may refer to the outflow end of the gas-liquid separator 3 or a position on the first pipeline, the front end and the rear end of other structures (except for the pipeline) are the same as those of the other structures, and it should be noted that the front end and the rear end refer to the positions adjacent to the front end of the pipeline, the front end of the pipeline refers to the end of the gas inlet or the liquid inlet, and the rear end of the pipeline refers to the end of the gas outlet or the liquid outlet of the pipeline, where all the pipelines in the specifications, including but not limited to the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the liquid outlet pipeline, and the exhaust pipeline.

Wherein the gas-liquid separator 3 is provided with a liquid discharge branch, and the liquid discharge branch is provided with a liquid discharge valve 16. The liquid discharge branch is a pipeline, one end of the liquid discharge branch is connected with the gas-liquid separator 3, the other end of the liquid discharge branch can be used for discharging liquid with the waste liquid collecting system or can be freely arranged for on-site discharging, and the liquid discharge valve 16 is arranged on the liquid discharge branch. The gas-liquid separator 3 is a device for separating gas and liquid. In this embodiment, the gas-liquid separator 3 using the physical sedimentation principle is adopted, and after the liquid substance in the sample gas is settled, the separated sample gas is discharged in time, and when the liquid in the gas-liquid separator 3 reaches a certain volume, the liquid discharge valve 16 is opened, so that the waste liquid enters the waste liquid collecting system through the liquid discharge port 13 or is discharged on site.

The detector 11 is of the model number GTQ-D610.

Preferably, the pump 4 is an explosion-proof pump.

Alternatively, the sampling probe 1 is of tubular construction.

Because the sample gas volume that sampling probe 1 obtained is great, and the sample gas volume that detector 11 needs is less, consequently, in this embodiment still includes flow control valve 5, diffusing flowmeter 9 and diffusing return circuit valve 18, and flow control valve 5, diffusing flowmeter 9 and diffusing return circuit valve 18 are established ties in proper order through a plurality of third pipelines and are formed the branch road that diffuses, and flow control valve 5 and filter module set up side by side in the rear end of aspiration pump 4 and respectively with aspiration pump 4 is connected, and the branch road that diffuses sets up side by side with the detection branch road, and the rear end of diffusing return circuit valve 18 inserts the branch road that discharges. The flow regulating valve 5 is used for regulating the flow of the sample gas in the diffusing branch, the sample gas from the air pump 4 is divided into two paths, and the flow of one path of the diffusing branch is regulated, so that the flow of the sample gas of the detecting branch can be indirectly regulated. The flow regulating valve 5 and the diffusing flowmeter 9 can be obtained directly by purchase. The front end of the flow regulating valve 5 is connected to the rear end of the sampling branch or the front end of the detecting branch through a third pipeline, in fact, as shown in fig. 1, the flow regulating valve 5 is only connected to a pipeline (the aforementioned second pipeline) between the air pump 4 and the filtering module through the third pipeline, a three-way pipeline structure is formed between the third pipeline of the flow regulating valve 5 and the second pipeline between the air pump 4 and the filtering module, and the rear end of the diffusing loop valve 18 is connected to the discharging branch through a third pipeline.

Alternatively, in the present embodiment, the filter module includes a fine filter 6 and a membrane filter 8, the fine filter 6 is provided at the rear end of the air pump 4 and connected to the air pump 4, and the membrane filter 8 is provided between the fine filter 6 and the sample gas flow meter 10 and connected to the fine filter 6 and the sample gas flow meter 10. In practice, as can be seen from the foregoing, the fine filter 6 is connected to the suction pump 4 via a second line.

Further, a three-way switching valve 7 is arranged between the precise filter 6 and the membrane filter 8, three ports of the three-way switching valve 7 are respectively connected with the precise filter 6, the membrane filter 8 and the calibration gas interface 14, and the three-way switching valve 7 can realize the selective access of the precise filter 6, the membrane filter 8 and the calibration gas interface 14 to a system so as to realize the detection of sample gas and the calibration and purging of the detector 11. Specifically, one port of the three-way switching valve 7 is connected to the precision filter 6 through a second pipeline, one port of the three-way switching valve 7 is connected to the membrane filter 8 through a second pipeline, and one port of the three-way switching valve 7 is connected to the calibration gas port 14 through a fourth pipeline. And a calibration branch is formed between the calibration gas port 14 and the three-way switching valve 7. Wherein the calibration gas port 14 is connectable to a calibration gas cylinder. Optionally, the precision filter 6 (also called as a security filter) is generally manufactured by adopting stainless steel materials as a cylinder shell, and tubular filter elements such as PP melt-blown, wire-burned, folded, titanium filter elements, active carbon filter elements and the like are adopted as filter elements in the cylinder shell, and different filter elements are selected according to different filter media and design processes so as to meet the requirements of the quality of effluent. The method is used for solid-liquid separation of various suspensions, has higher environmental requirements and higher filtering precision, has wide application range, and is suitable for the industrial fields of medicine, food, chemical industry, environmental protection, water treatment and the like. For example, the fine filter 6 in the present embodiment may employ a CEMS protection filter, and the fine filter 6 is used to filter out impurities and droplets remaining in the sample gas. The membrane filter 8 is a membrane filter, and a filter membrane is used for filtering, which belongs to a relatively mature prior art and is not described herein, wherein the membrane filter 8 used in the embodiment is a water-blocking filter, for example, may be a Sidoris Midist 2000 water-blocking filter. The sample gas filtered by the fine filter 6 is further filtered by the membrane filter 8, saturated moisture in the sample gas (short for sample gas) is separated, and the sample gas is completely dehydrated and decontaminated and then enters the next structure such as the sample gas flowmeter 10. Both the precision filter 6 and the membrane filter 8 are commercially available.

Further, an exhaust pipeline is arranged at the rear end of the detector 11, the front end of the exhaust pipeline is connected with the detector 11, the rear end of the exhaust pipeline is connected into the exhaust branch, and a check valve 17 is arranged on the exhaust pipeline. The check valve 17 is used to control the flow of gas in the detector 11 in only one direction in the exhaust line, for example only into the exhaust branch, and not back. The check valve 17 is available directly from commercial sources.

Preferably, in this embodiment, the sampling probe 1 is disposed in the limited space a, and the structures of the sampling valve 2, the gas-liquid separator 3, the air pump 4, the filtering module, the detector 11, the sample gas flow meter 10, the flame arrester 15, the liquid discharge valve 16, the flow regulating valve 5, the diffusing flowmeter 9, the diffusing loop valve 18, the three-way switching valve 7, the check valve 17 and the like are all disposed in one cabinet 12, so as to realize the fixing and the integrated design of the structures, and the cabinet 12 is mounted on a wall or a bracket outside the limited space a, so that the installation is convenient, and the cabinet 12 can play a role in protection. Further, the first pipeline is penetrating through the cabinet 12, and a corresponding opening may be provided on the cabinet 12. Optionally, in this embodiment, the liquid drain port 13 and the calibration gas port 14 are both disposed on the side surface of the cabinet 12, and the liquid drain branch and the calibration branch penetrate out of the cabinet 12, so that openings matched with the liquid drain port 13 and the calibration gas port 14 are disposed on the cabinet 12. Preferably, the cabinet 12 may be a thermal cabinet. As shown in fig. 1, the rear end of the exhaust branch and the rear end of the third pipeline are joined into one pipeline, that is, the exhaust branch, which passes through the cabinet 12, and thus, an opening corresponding to the exhaust branch is provided in the cabinet 12.

The sampling valve 2, the three-way switching valve 7, the drain valve 16 and the bleed-off valve 18 mainly play a role in opening and closing, and can be purchased directly by adopting the prior art.

Flame arrestor 15 is a safety accessory mounted on a tank or a pipe for discharging a flammable gas for preventing the spread of flame to the tank or pipe due to flashback. The fire-retardant device consists of a fire-retardant core, a fire-retardant device shell and accessories, allows gas to pass through, prevents external flame from spreading to the inner direction, achieves the purpose of explosion prevention, and further ensures the safety of facilities. Production safety accidents can be caused because no flame arresters are arranged on equipment and pipelines or the performance of the equipment and the pipelines is not up to standard. According to the fire-retarding structure, it can be divided into 5 kinds of filling type, plate type, wire mesh type, liquid sealing type and corrugated type. In this embodiment, a wire mesh type flame arrester is used.

The system detection process provided by the utility model is as follows:

1. opening the explosion-proof air pump 4 and the diffusing loop valve 18;

2. switching the three-way switching valve 7 to the sample side to obtain the sample gas, in practice, that is, the two ports of the three-way switching valve 7 corresponding to the sampling valve 2, the one end of the precision filter 6 and the one end of the membrane filter 8 are opened, and the port corresponding to the calibration gas port 14 is closed;

3. opening the sampling valve 2;

4. sample gas passes through the sampling probe 1, enters the gas-liquid separator 3, the liquid substance in the sample gas is settled by utilizing the physical settlement principle, then the separated sample gas is discharged in time (when the liquid in the gas-liquid separator reaches a certain capacity, the liquid discharge valve 16 is opened, the waste liquid enters the waste liquid collecting system through the liquid discharge port 13 or is discharged on site), the flow rate of the sample gas entering the diffusing branch is ensured by regulating the diffusing flowmeter 9 in the diffusing branch through the flow regulating valve 5, the sample gas in the detecting branch can be ensured to have proper sample flow rate, the sample gas in the detecting branch enters the precise filter 6, the residual impurities and liquid drops in the sample gas are filtered through the precise filter 6, then the sample gas enters the membrane filter 8 to separate saturated moisture in the sample gas, and after the sample gas after the impurities are completely removed, the flow regulating knob on the sample gas flow meter 10 is regulated, so that the sample gas enters the detector 11 to have stable flow rate and enough lag time, and the accurate and timely measured data of the detector 11 are ensured.

Wherein the bleed branch and the sample gas in the exhaust branch together reach the exhaust manifold or are directly vented through the flame arrestor 15.

The calibration and purging processes are as follows:

1. closing the explosion-proof air pump 4 and the bleeding loop valve 18; .

2. Switching the three-way switching valve 7 to the standard gas side to ensure that standard gas is obtained, in practice, that is, one end of the three-way switching valve 7 corresponding to the sampling valve 2 and the precision filter 6 is closed, and two ports corresponding to the standard gas port 14 and the membrane filter 8 are opened;

3. closing the sampling valve 2;

4. opening a standard gas cylinder to be connected with a standard gas interface 14 to adjust the standard gas pressure to be proper, adjusting a flow adjusting knob on the sample gas flowmeter 10 to the standard flow described in the specification of the detector 11, and operating the instrument according to the specification of the detector 11 to enable the instrument to enter a standard state until the instrument is calibrated successfully;

5. after the instrument calibration is successful, a main valve (not shown) of the standard gas cylinder is closed, instrument gas with proper pressure is accessed from a standard gas interface 14 to enter a purging process, a flow adjusting knob on the sample gas flowmeter 10 is adjusted to enable the instrument gas to enter the detector 11 to be displayed and reset, and the calibration and purging process is finished after the stabilization time is more than 1min and no fluctuation exists;

6. the normal detection procedure is resumed, as in the above detection procedure, and is not repeated here.

The utility model provides an on-line analysis system for combustible or toxic gas in a limited space, wherein a sampling probe 1 is arranged in the limited space, other structures comprise a detector 11 (a sampling valve 2, a gas-liquid separator 3, an air pump 4, a filtering module, the detector 11, a sample gas flow meter 10, a flame arrester 15, a liquid discharge valve 16, a flow regulating valve 5, a diffusing flowmeter 9, a diffusing loop valve 18, a three-way switching valve 7, a check valve 17 and a flame arrester 15) are all arranged outside the limited space, so that the detection requirement can be met, the operation is simple and convenient, the maintenance amount is small, and the field use requirement is met to the maximum extent.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims

1. An on-line analysis system for combustible or toxic gases in a confined space, comprising: the device comprises a sampling probe, a sampling valve, a gas-liquid separator, an air pump, a filtering module, a detector, a sample gas flowmeter and a flame arrester;

the sampling probe is arranged in a limited space, the sampling valve, the gas-liquid separator, the air pump, the filtering module, the detector, the sample gas flowmeter and the flame arrester are all arranged outside the limited space, the sampling probe, the gas-liquid separator and the air pump are sequentially connected in series through a plurality of first pipelines to form a sampling branch, the sampling valve is arranged on the first pipeline between the gas-liquid separator and the sampling probe, the air pump, the filtering module, the sample gas flowmeter and the detector are sequentially connected in series through a plurality of second pipelines to form a detection branch, the rear end of the detector is provided with a discharge branch, and the flame arrester is arranged on the discharge branch.

2. The on-line analysis system for combustible or toxic gases in a limited space according to claim 1, further comprising a flow regulating valve, a bleeding flowmeter and a bleeding loop valve, wherein the flow regulating valve, the bleeding flowmeter and the bleeding loop valve are sequentially connected in series through a plurality of third pipelines to form a bleeding branch, the flow regulating valve and the filtering module are arranged at the rear end of the air pump in parallel and are respectively connected with the air pump, the bleeding branch is arranged with the detection branch in parallel, and the rear end of the bleeding loop valve is connected with the discharge branch.

3. The in-line analysis system of combustible or toxic gases within a confined space according to claim 2, wherein said filter module includes a precision filter disposed at a rear end of said pump and connected to said pump, and a membrane filter disposed between said precision filter and said sample gas flow meter and connected to said precision filter and said sample gas flow meter.

4. The on-line analysis system for combustible or toxic gas in a limited space according to claim 3, wherein a three-way switching valve is arranged between the precise filter and the membrane filter, three ports of the three-way switching valve are respectively connected with the precise filter, the membrane filter and the calibration gas interface, and the three-way switching valve can realize selective access of the precise filter, the membrane filter and the calibration gas interface to the system.

5. The on-line analysis system for combustible or toxic gases within a confined space according to any one of claims 1 to 4 wherein a rear end of the detector is provided with an exhaust line, a front end of the exhaust line is connected to the detector, a rear end of the exhaust line is connected to the exhaust branch, and a check valve is provided on the exhaust line.

6. The system of any one of claims 1 to 4, wherein the gas-liquid separator is provided with a liquid discharge branch, and the liquid discharge branch is provided with a liquid discharge valve.

7. The system of any one of claims 1 to 4, wherein the detector is a GTQ-D610.

8. The in-line analysis system for combustible or toxic gases within a confined space of any one of claims 1 to 4 wherein the pump is an explosion-proof pump.