Intrinsic safety type gas detector

Abstract

The utility model relates to the technical field of coal mine underground gas analysis, in particular to an intrinsic safety type gas detector, which comprises a gas inlet module, a filtering system and an analysis module, the gas inlet module comprises a sample gas pipeline, a carrier gas pipeline, a standard gas pipeline and a shunting and detecting assembly, the input end of the sample gas pipeline is provided with a sample gas inlet valve group for collecting sample gas, and the shunting and detecting assembly comprises a sample gas inlet valve, a carrier gas inlet valve and a third inlet valve; and sample gas, carrier gas and standard gas respectively pass through a sample gas inlet valve, a carrier gas inlet valve and a third inlet valve and then are introduced into the analysis module. The gas chromatographic analyzer is used as an analysis module, so that the space volume of the equipment is reduced, the internal mechanical structure and the gas path structure of the equipment are simplified, the cost and the operation and maintenance difficulty of the equipment are reduced, the gas detection performance is improved, and the gas detection types are expanded.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mine underground gas analysis technical field especially an intrinsic safety type gas detector. BACKGROUND

[0002] There are many harmful gases such as methane, carbon monoxide, hydrogen sulfide and the like in coal mine underground, and it is of great significance to detect the types and concentration of underground gases in real time for guaranteeing personnel life safety, preventing fire and the like accidents, improving production efficiency, timely adjusting production decision and the like. The existing underground gas detection device mostly adopts laser intrinsic safety type detection equipment or multi-sensor intrinsic safety type detection equipment, and the overall device has large floor space, complex structure, and high maintenance and replacement technical difficulty and cost, and at the same time, the gas detection sensitivity is low, and the precision is poor, which can not meet the needs of underground safety production. SUMMARY

[0003] The utility model aims at solving above-mentioned problem, provides an intrinsic safety type gas detector, and the technical scheme that it adopts is as follows:

[0004] An intrinsic safety type gas detector, including air intake module and analysis module, the air intake module includes sample gas pipeline, carrier gas pipeline, standard gas pipeline and shunt and detection assembly, the sample gas pipeline input end is provided with sample gas air intake valve group for collecting sample gas, the shunt and detection assembly includes sample gas air intake valve, carrier gas air intake valve and third air intake valve, and sample gas, carrier gas and standard gas are respectively passed into analysis module after sample gas air intake valve, carrier gas air intake valve and third air intake valve.

[0005] On the basis of the above-mentioned scheme, the shunt and detection assembly includes first pressure sensor and second pressure sensor, the first pressure sensor is used to detect the pressure of carrier gas pipeline input end, and the second pressure sensor is used to detect the pressure of standard gas pipeline input end, the first pressure sensor and second pressure sensor send alarm signal when reaching predetermined air pressure value.

[0006] On the basis of the above-mentioned scheme, the first pressure sensor and second pressure sensor are all built-in pressure alarm algorithm, the pressure alarm algorithm includes preset high limit pressure value p1, middle limit pressure value p2 and low limit pressure value p3, and p1>p2>p3, and p is the real-time pressure in pipeline, then,

[0007] (1) when p is greater than or equal to p1, high pressure alarm signal is sent, indicating that the pressure value is too high;

[0008] (2) when p2 is greater than or equal to p and less than or equal to p3, middle limit alarm signal is sent, suggesting to check valve group element in pipeline or replace gas cylinder;

[0009] (3) when p is less than or equal to p3, low pressure alarm signal is sent, indicating that the pressure value is too low, and the equipment can not run at this time.

[0010] Preferably, the filter system for filtering water and dust from the gas entering the analysis module comprises a condenser, a dust filter and a three-pass filter valve, the condenser is arranged downstream of the sample gas inlet valve group, a water filter for discharging condensed water is arranged downstream of the condenser, the gas passing through the shunt and detection assembly enters the analysis module in sequence through the dust filter and the three-pass filter valve, and a filter element is arranged in the three-pass filter valve.

[0011] On the basis of the above scheme, the filter system further comprises a front-end dust filter and a front-end water filter, the front-end dust filter is arranged at the front end of the sample gas collection pipeline upstream of the sample gas inlet valve group, and the front-end water filter is arranged upstream of the sample gas inlet valve group.

[0012] Preferably, the gas inlet module further comprises a manual sample inlet pipeline, a manual sample inlet filter and a manual sample inlet pump are arranged on the manual sample inlet pipeline, and the manual sample inlet gas passes through the manual sample inlet pipeline and the third gas inlet valve to enter the analysis module.

[0013] Preferably, a carrier gas trap for filtering water and dust from the carrier gas is arranged on the carrier gas pipeline.

[0014] Preferably, the sample gas inlet valve group is connected to an exhaust pump for exhausting gas outside the sample gas pipeline, a flow meter and an exhaust pipeline are arranged downstream of the water filter, the flow meter and the exhaust pipeline are connected in parallel to the sample gas pipeline, an exhaust assembly for exhausting gas is connected to the gas outlet end of the dust filter, and the exhaust assembly is connected in parallel to the three-pass filter valve.

[0015] Preferably, a gas extraction pump for extracting gas in the analysis module is arranged downstream of the analysis module, and a stop valve is arranged between the gas extraction pump and the analysis module.

[0016] Preferably, the explosion-proof box body, the upper computer and the display mechanism are further included, the explosion-proof box body comprises an upper box body and a lower box body which are separated from each other, a sample gas pipeline interface is arranged on the lower box body, the sample gas inlet valve group, the condenser and the water filter are arranged in the lower box body, a carrier gas tank and a standard gas tank are further arranged in the lower box body, and the analysis module and the circuit board mounting plate are arranged in the upper box body.

[0017] The gas chromatograph analyzer is used as the analysis module, the space volume of the equipment is reduced, the internal mechanical structure and the gas circuit structure of the equipment are simplified, the cost and operation and maintenance difficulty of the equipment are reduced, the gas detection performance is improved, the types of gas detection are expanded, the needs of underground safety production can be met, the filter system with multiple water filtering and dust filtering functions can realize step-by-step filtering of water and dust in the gas and finally meet the cleanliness requirements of the gas chromatograph analyzer, the explosion-proof box body is separated from each other, the elements that need to be frequently replaced and detected are concentrated in the lower box body, operation is facilitated, and the operation and maintenance difficulty is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The gas analysis and detection equipment gas circuit principle drawing of the utility model;

[0019] Figure 2 The gas analysis and detection equipment structure appearance drawing of the utility model;

[0020] Figure 3 The gas analysis and detection equipment internal structure drawing of the utility model. DETAILED DESCRIPTION

[0021] The utility model will be further described below in combination with the drawings and examples:

[0022] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be directly connected, or indirectly connected through an intermediate medium, can be the communication between two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0023] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0024] In the utility model, unless another definite provision and limitation, first feature is in second feature " on " or " under " can include first and second features direct contact, also can include first and second features not direct contact but contact through additional feature between them. Moreover, first feature is in second feature " on ", " above " and " on " include first feature is in second feature directly above and obliquely above, or just indicate first feature horizontal height is higher than second feature. First feature is in second feature " under ", " below " and " under " include first feature is in second feature directly below and obliquely below, or just indicate first feature horizontal height is less than second feature.

[0025] As Figure 1 Indicated, a kind of intrinsic safety type gas detector, it is characterized in that, including air intake module and analysis module, the air intake module includes sample gas pipeline, carrier gas pipeline, standard gas pipeline and shunt and detection component, sample gas pipeline input end is provided with sample gas air intake valve group to collect sample gas, shunt and detection component include sample gas air intake valve, carrier gas air intake valve and third air intake valve, sample gas, carrier gas and standard gas are respectively after sample gas air intake valve, carrier gas air intake valve and third air intake valve and enter analysis module, carrier gas pipeline is provided with carrier gas trap to filter water and dust to carrier gas.The analysis module is gas chromatography analyzer, gas chromatography analyzer in the embodiment includes microchromatography 5A module and microchromatography PPU module, and different kinds of gas are detected respectively.

[0026] The shunt and detection component includes first pressure sensor and second pressure sensor, the first pressure sensor is used to detect the pressure of carrier gas pipeline input end, and the second pressure sensor is used to detect the pressure of standard gas pipeline input end, the first pressure sensor and the second pressure sensor send alarm signals when reaching a predetermined air pressure value. Specifically, the first pressure sensor and the second pressure sensor are both built-in pressure alarm algorithm, the pressure alarm algorithm includes preset high limit pressure value p1, middle limit pressure value p2 and low limit pressure value p3, and p1>p2>p3, and p is the real-time pressure in the pipeline, then,

[0027] (1) when p≥p1, high pressure alarm signal is sent, indicating that the pressure value is too high;

[0028] (2) when p2≥p>p3, middle limit alarm signal is sent, indicating that the pressure value is close to the low limit pressure value p3, which may be due to the problem of valve group element setting, or it may be that the gas cylinder has been used for a long time and the pressure gradually decreases, so it is recommended to check the valve group element in the pipeline or replace the gas cylinder;

[0029] (3) when p≤p3, low pressure alarm signal is sent, indicating that the pressure value is too low, and the equipment cannot run at this time.

[0030] It should be noted that the specific predetermined values of the pressure alarm algorithm embedded in the first pressure sensor and the second pressure sensor are the same or different.

[0031] The filter system for filtering water and dust from the gas entering the analysis module includes a condenser, a dust filter, and a three-pass filter valve. The condenser is arranged downstream of the sample gas inlet valve group. A water filter is arranged downstream of the condenser to discharge condensed water. The gas passing through the shunt and detection assembly enters the analysis module in sequence through the dust filter and the three-pass filter valve. The three-pass filter valve is provided with a filter element. The filter system further includes a front-end dust filter and a front-end water filter. The front-end dust filter is arranged at the front end of the sample gas collection pipeline upstream of the sample gas inlet valve group. The front-end water filter is arranged upstream of the sample gas inlet valve group. The filter system further includes a water and dust filtering device in the shunt box.

[0032] The filter levels of the above filter system are as follows (taking sample gas as an example):

[0033] (1) The front-end dust filter performs the first layer of dust filtering on the sample gas entering the sample gas collection pipeline.

[0034] (2) The water and dust filtering device in the shunt box performs the first layer of water filtering and the second layer of dust filtering.

[0035] (3) The front-end water filter is arranged at the inlet of the positive pressure pump at the sample gas inlet valve group, thereby performing the second layer of water filtering on the sample gas entering the sample gas inlet valve group.

[0036] (4) The condenser performs the third layer of water filtering on the sample gas entering the sample gas pipeline according to the pressure difference and / or temperature difference. The filtered water is discharged through a water filter, which is a gas source processor.

[0037] (5) The gas passing through the shunt and detection assembly enters the dust filter for the third layer of dust filtering. The dust filter is a channel type dust filter, which can filter dust with a size of 10 μm.

[0038] (6) The gas passing through the dust filter enters the three-pass filter valve, which has a filter element for the fourth layer of dust filtering. The filter element can filter dust with a size of 5 μm, thereby meeting the requirements of the gas chromatograph analyzer.

[0039] The gas inlet module further includes a manual sample injection pipeline. A manual sample injection filter and a manual sample injection pump are arranged on the manual sample injection pipeline. The manual sample injection gas passes through the manual sample injection pipeline and the third inlet valve, and then enters the analysis module. Preferably, the manual sample injection gas passes through the third inlet valve and then enters the sample gas inlet valve, and is output from the sample gas inlet valve and then enters the analysis module, thereby simplifying the gas path structure and reducing the number of components and the risk of leakage.

[0040] The sample gas inlet valve group is connected with an exhaust pump for exhausting gas outside the sample gas pipeline, a flow meter and an exhaust pipeline are arranged downstream of the water filter, the flow meter and the exhaust pipeline are connected in parallel with the sample gas pipeline, the dust filter outlet is connected with a purge assembly for exhausting gas, and the purge assembly is connected in parallel with the three-way filter valve.

[0041] A gas extraction pump is arranged downstream of the analysis module to extract gas in the analysis module, and the gas in the analysis module is exhausted by the gas extraction pump to prevent residual gas from causing detection errors. A stop valve is arranged between the gas extraction pump and the analysis module to prevent external air from entering the analysis module and contaminating the analysis results.

[0042] As shown in Figure 2 and Figure 3 , the explosion-proof box 10 includes an upper box 11 and a lower box 12 separated from each other, a sample gas pipeline interface 23 is arranged on the lower box 12, the sample gas inlet valve group 24, the condenser tube, and the water filter are arranged in the lower box 12, the carrier gas tank 21 and the standard gas tank 22 are also arranged in the lower box 12, and the analysis module 25 and the circuit board mounting plate 26 are arranged in the upper box. The above structure allows the elements that need to be frequently replaced and detected to be concentrated in the lower box, facilitating operation and reducing the difficulty of operation and maintenance.

[0043] The sample gas detection steps are:

[0044] S1. The gas of multiple monitoring points enters the sample gas inlet valve group, and the gas of the target monitoring point to be detected enters the sample gas pipeline through the sample gas inlet valve group, and the gas of other monitoring points is exhausted to the outside of the sample gas pipeline by the exhaust pump;

[0045] S2. The gas entering the sample gas pipeline is dehumidified by the condenser tube, and the moisture in the condenser tube is discharged through the water filter;

[0046] S3. The flow meter is opened, and a predetermined flow of sample gas is discharged to complete pressure relief and flow splitting, and the remaining sample gas enters the sample gas inlet valve;

[0047] S4. The sample gas passing through the sample gas inlet valve is divided into detection gas and excess gas, the detection gas enters the analysis module after passing through the dust filter and the three-way filter valve, and the excess gas is discharged through the purge assembly;

[0048] S5. The carrier gas is filtered by the carrier gas trap, and then enters the analysis module after passing through the carrier gas inlet valve;

[0049] S6. The carrier gas carries and pushes the sample gas to complete analysis in the gas chromatograph;

[0050] S7. The stop valve is opened, and the gas extraction pump extracts and exhausts the residual gas in the analysis module.

[0051] The manual sample injection detection steps are:

[0052] R1. The sample gas inlet valve group is fully closed, and there is no sample gas input in the sample gas pipeline;

[0053] R2. The artificial sampling gas enters the artificial sampling pipeline under the action of the artificial sampling pump through the artificial sampling filter;

[0054] R3. The artificial sampling gas enters the total pipeline through the third gas inlet valve and the sample gas inlet valve;

[0055] R4. The artificial sampling gas in the total pipeline is divided into detection gas and excess gas, the detection gas enters the analysis module through the three-pass filter valve, and the excess gas is discharged through the purge assembly;

[0056] R5. The carrier gas is filtered through the carrier gas trapping trap, and then enters the analysis module through the carrier gas inlet valve;

[0057] R6. The carrier gas carries and pushes the artificial sampling gas to complete the analysis in the gas chromatograph analyzer;

[0058] R7. The stop valve is opened, and the gas pump exhausts and empties the residual gas in the analysis module.

[0059] The utility model has been described above by way of example, but the utility model is not limited to the above-mentioned specific embodiments, and any modification or modification based on the utility model belongs to the scope of protection required by the utility model.

Claims

1. An intrinsically safe gas detector, characterized by, The gas intake module comprises a sample gas pipeline, a carrier gas pipeline, a standard gas pipeline, and a shunt and detection assembly. The sample gas pipeline input end is provided with a sample gas intake valve group for collecting sample gas. The shunt and detection assembly comprises a sample gas intake valve, a carrier gas intake valve, and a third intake valve. The sample gas, carrier gas, and standard gas pass through the sample gas intake valve, carrier gas intake valve, and third intake valve, respectively, and then enter the analysis module.

2. The intrinsically safe gas detector according to claim 1, characterized in that The shunt and detection assembly comprises a first pressure sensor and a second pressure sensor. The first pressure sensor is used to detect the pressure of the carrier gas pipeline input end, and the second pressure sensor is used to detect the pressure of the standard gas pipeline input end. When the first pressure sensor and the second pressure sensor reach a predetermined pressure value, an alarm signal is sent.

3. The intrinsically safe gas detector according to claim 2, characterized in that The first pressure sensor and the second pressure sensor both have a built-in pressure alarm algorithm. The pressure alarm algorithm comprises a preset high limit pressure value p1, a medium limit pressure value p2, and a low limit pressure value p3, and p1 > p2 > p3. Let the real-time pressure in the pipeline be p, then, (1) When p ≥ p1, a high pressure alarm signal is sent, indicating that the pressure value is too high. (2) When p2 ≥ p > p3, a medium limit alarm signal is sent, suggesting checking the valve group elements in the pipeline or replacing the gas cylinder. (3) When p ≤ p3, a low pressure alarm signal is sent, indicating that the pressure value is too low, and the device cannot operate at this time.

4. The intrinsically safe gas detector of claim 1, wherein, The filtration system also comprises a front-end dust filter and a front-end water filter. The front-end dust filter is arranged at the front end of the sample gas collection pipeline upstream of the sample gas intake valve group, and the front-end water filter is arranged upstream of the sample gas intake valve group.

5. The intrinsically safe gas detector of claim 4, wherein, The gas intake module further comprises a manual sample introduction pipeline. A manual sample introduction filter and a manual sample introduction pump are arranged on the manual sample introduction pipeline. The manual sample introduction gas passes through the manual sample introduction pipeline and the third intake valve, and then enters the analysis module.

6. The intrinsically safe gas detector of claim 1, wherein, A carrier gas trapping tank for filtering water and dust from the carrier gas is arranged on the carrier gas pipeline.

7. The intrinsically safe gas detector of claim 1, wherein, The sample gas intake valve group is connected to an exhaust pump for exhausting gas outside the sample gas pipeline. A flow meter and an exhaust pipeline are arranged downstream of the water filter. The flow meter and the exhaust pipeline are connected in parallel with the sample gas pipeline. The dust filter exhaust end is connected to a purging assembly for exhausting gas. The purging assembly is connected in parallel with the three-pass filter valve.

8. The intrinsically safe gas detector of claim 4, wherein, A gas extraction pump for extracting gas in the analysis module is arranged downstream of the analysis module. A stop valve is arranged between the gas extraction pump and the analysis module.

9. The intrinsically safe gas detector of claim 1, wherein, ​ 10. The intrinsically safe gas detector of claim 1, wherein, It also includes the explosion-proof box (10), host computer and display mechanism (13), the explosion-proof box (10) includes mutually separated upper box (11) and lower box (12), the lower box (12) is provided with sample gas pipeline interface (23), the sample gas inlet valve group (24), condenser pipe, water filter are arranged in the lower box (12), the lower box (12) is also provided with carrier gas gas tank (21) and standard gas gas tank (22), analysis module (25) and circuit board mounting plate (26) are arranged in the upper box.

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