Coal mine gas pipeline monitoring sensor gas extraction condensation device

Abstract

The present invention relates to a gas extraction condensation device for coal mine gas transmission pipeline monitoring sensor. The gas extraction condensation device is installed on the gas transmission pipeline for automatic gas extraction, including a pipeline connection seat assembly for connecting the gas transmission pipeline, a gas extraction and drainage assembly for automatically extracting gas in the gas transmission pipeline and draining water, a condensation assembly for condensing the extracted gas, and a sensor installation assembly for connecting the sensor. The gas extraction condensation device and gas extraction method for coal mine gas transmission pipeline monitoring sensor of the present invention are used with a matching sensor on the exhaust (transmission) gas pipeline, i.e., the positive pressure side pipeline. The device has an integrated structural design, is simple to install and maintain, and has an efficient structural design to achieve rapid cooling of the gas sample. The simple and reliable self-drainage design saves personnel maintenance costs.

Description

Technical field:

[0001] The invention relates to the technical field of industrial and mining equipment, and in particular to a gas extraction and condensation device for a coal mine gas transmission pipeline monitoring sensor. Background technology:

[0002] The ground pump station of the coal mine gas extraction system is equipped with water ring vacuum pumps, water seal flame arresters and other equipment, which causes a lot of water vapor and high temperature in the exhaust (transmission) gas pipeline, that is, the positive pressure side pipeline (the temperature difference in winter is close to 50°C). High-temperature gas samples entering the sensor probe are prone to condensation, which affects and damages the accuracy and life of gas sensors.

[0003] At present, the air extraction devices on the exhaust (transmission) gas pipeline, i.e. the positive pressure side pipeline, are mainly divided into four categories: 1. The air extraction base is extended with a PVC pipe, and the sensor is installed at a high place, which has problems such as complex installation and easy aging of PVC material; 2. The regenerated desiccant is used to remove moisture, and the desiccant needs to be replaced frequently, which is costly and not suitable for the dehumidification and cooling needs of long-term monitoring; 3. The complex cooling and dehumidification structure has the problem of frequent maintenance by personnel; 4. The insulation material is installed on the outside of the sensor to reduce the temperature difference. This method does not completely solve the temperature difference problem, and there is a situation where the site is messy and difficult to replace the sensor. Summary of the invention:

[0004] In view of the above problems, the present invention proposes a gas extraction and condensation device for coal mine gas transmission pipeline monitoring sensor, which is easy to install, maintenance-free, and can solve the temperature difference between the gas sample and the sensor probe of not less than 50°C.

[0005] The present invention is realized by the following technical scheme: a gas extraction and condensation device for coal mine gas pipeline monitoring sensor, comprising a pipeline connection seat assembly for connecting the gas pipeline, a gas extraction and drainage assembly for automatically extracting gas in the gas pipeline and draining water, a condensation assembly for condensing the extracted gas, and a sensor installation assembly for connecting the sensor;

[0006] The pipeline connection seat assembly includes a pipeline connection seat body and a first fastener, wherein the pipeline connection seat body is fixed to the gas pipeline, and the pipeline connection seat body can be detachably connected to the gas intake and drainage assembly through the first fastener;

[0007] The air intake and drainage assembly includes a water receiving pan, a differential pressure baffle, an air intake pipe, and an air return pipe. The top of the water receiving pan has a cavity, and the bottom of the water receiving pan can be detachably connected to the pipeline connection seat body through a first fastener. The air intake pipe and the air return pipe are fixed to the bottom of the water receiving pan, and the tops of the air intake pipe and the air return pipe are respectively connected to the cavity of the water receiving pan, and the bottoms of the air intake pipe and the air return pipe can be connected to the gas pipeline through the pipeline connection seat body. The differential pressure baffle is fixed to the bottom of the water receiving pan and is arranged between the air intake pipe and the air return pipe, and the bottom of the differential pressure baffle is lower than the bottom of the air intake pipe and the air return pipe;

[0008] The condensing assembly includes a condenser body, an integrated spiral air duct, a return air connecting pipe and a second fastener, the integrated spiral air duct is fixed in the condenser body, the return air connecting pipe is arranged in the integrated spiral air duct, an air intake port and an air return port are provided at the top of the condenser body, the air intake port is connected with the air intake pipe through the integrated spiral air duct to form an air intake circuit, the return air port is connected with the return air pipe through the return air connecting pipe to form an air return circuit, and the bottom end of the condenser body is detachably connected with the water receiving tray through the second fastener;

[0009] The sensor mounting assembly includes a shell, a T-block, a flow controller and a third fastener. The shell has a chamber, which is connected to the air intake port and the air return port respectively. The shell is detachably connected to the condenser body through the third fastener. The T-block is fixed in the shell, and the flow controller is installed on the return air side of the chamber.

[0010] In order to facilitate the disassembly and assembly of the pipe connection seat body and the water collecting pan and ensure the sealing between the two, the top of the pipe connection seat body is provided with a first mounting plate, the top of the first mounting plate is provided with a groove, and a first sealing ring is arranged in the groove; the bottom of the water collecting pan is provided with a second mounting plate, the bottom of the second mounting plate is provided with a groove, the first mounting plate and the second mounting plate are sealed and connected by a first sealing ring, and the first mounting plate and the second mounting plate are detachably connected by a first fastener.

[0011] In order to ensure the heat insulation effect and prevent gas leakage, a first-stage heat shield assembly is arranged between the bottom end of the condenser main body and the water receiving pan. The first-stage heat shield assembly includes a heat shield ring, an upper sealing ring and a lower sealing ring. The bottom end of the condenser main body and the top end of the water receiving pan are connected through the heat shield ring. The top end of the heat shield ring is sealed with the bottom end of the condenser main body through the upper sealing ring, and the bottom end of the heat shield ring is sealed with the bottom end of the condenser main body through the lower sealing ring.

[0012] In order to facilitate the assembly of the integrated spiral air duct, the top end of the integrated spiral air duct is detachably connected to the condenser body through a fourth fastener.

[0013] In order to ensure the sealing of the return air, sealing members are respectively provided at the top and bottom ends of the return air connecting pipe.

[0014] In order to facilitate the installation of the T-block, the T-block is fixed at the center of the housing by a fifth fastener.

[0015] In order to achieve a better heat insulation effect, a second-stage heat shielding component is arranged between the condenser body and the shell.

[0016] The gas extraction method of the gas extraction condensation device of the coal mine gas pipeline monitoring sensor comprises the following steps:

[0017] (1) First, install the pipe connector assembly on the gas pipeline;

[0018] (2) Then assemble the air intake and drainage assembly, the condensation assembly and the sensor installation assembly, and insert the air intake and drainage assembly into the pipeline connection seat assembly and connect it to the inner cavity of the gas pipeline;

[0019] (3) The air flow in the gas pipeline forms a high-pressure area and a low-pressure area on both sides of the differential pressure baffle. The high-pressure gas enters the integrated spiral airway through the gas intake pipe. The gas exchanges heat through the integrated spiral airway. The condensed water generated during the cooling process flows back to the gas pipeline along the integrated spiral airway. The cooled gas provides a gas sample to the sensor and flows back to the gas pipeline through the flow controller, the return gas connecting pipe, and the return gas pipe in turn.

[0020] The beneficial effects of the present invention are as follows: the air extraction condensation device and air extraction method of the present invention are used with a matching sensor on the exhaust (transmission) gas pipeline, i.e., the positive pressure side pipeline. The device has an integrated structural design, which is simple to install and maintain. The efficient structural design realizes rapid cooling of the gas sample, and the simple and reliable self-drainage design saves personnel maintenance costs. Description of the drawings:

[0021] Figure 1 It is a structural schematic diagram of the gas extraction and condensation device of the coal mine gas pipeline monitoring sensor of the present invention when it is installed;

[0022] Figure 2 It is a cross-sectional view of the gas extraction and condensation device of the coal mine gas transmission pipeline monitoring sensor of the present invention;

[0023] Figure 3 It is a schematic diagram of the three-dimensional structure of the air intake and drainage assembly of the present invention;

[0024] Figure 4 is a cross-sectional view of the air intake and drainage assembly of the present invention;

[0025] Figure 5 It is a schematic diagram of the three-dimensional structure of the integrated spiral airway of the present invention;

[0026] Figure 6 It is a cross-sectional view of the integrated spiral airway of the present invention. Specific implementation method:

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0028] like Figure 1The coal mine gas pipeline monitoring sensor gas extraction and condensation device shown includes, from bottom to top, a pipe connecting seat assembly 2 for connecting the gas pipeline 1, an air extraction and drainage assembly 3 for automatically extracting and draining the gas in the gas pipeline 1, a condensation assembly 4 for condensing the extracted gas, and a sensor mounting assembly 5 for connecting the sensor, and each assembly is detachably connected by fasteners.

[0029] Specifically, Figure 2 The pipe connection seat assembly shown includes a pipe connection seat body 21, a sealing ring 22, and a ∮64-sized clamp 23. The pipe connection seat body 21 is made of 304 stainless steel and is welded directly above the gas pipeline during construction. The upper end of the pipe connection seat body 21 adopts a ∮64-sized quick-release chuck design that can be quickly connected to the upper gas intake and drainage assembly through the clamp 23. The pipe connection seat body 21 and the gas intake and drainage assembly are sealed by a sealing ring 22 to prevent gas leakage.

[0030] like Figure 2-4 The air intake and drainage assembly shown includes a differential pressure baffle 34, an air intake pipe 32, an air return pipe 33, and a water receiving tray 31. The differential pressure baffle 34 separates the air intake pipe 32 and the air return pipe 33, and partially wraps the air return pipe 33. The airflow flowing in the gas pipeline forms a high-pressure area in front of the differential pressure baffle 34 and a low-pressure area in the rear. The high-pressure gas enters the device through the air intake pipe 32 and returns to the gas pipeline from the air return pipe 33, realizing the function of collecting gas samples. The inner diameter of the air intake pipe 32 and the air return pipe 33 is designed to be 12mm to avoid obstruction caused by water droplets and coal ash. The water receiving tray 31 adopts a V-shaped structural design, which can quickly collect the condensed water dripping from the upper part to the bottom and discharge it downward into the gas pipeline through the air intake pipe 32 by gravity. The bottom of the water receiving tray 31 has a second mounting tray 314 for matching with the first mounting tray on the top of the pipeline connection seat body, and the top has a third mounting tray 313 for matching with the bottom end of the condenser body. An air inlet 311 and an air return pipe interface 312 are provided on the water receiving tray 31 . The air inlet 311 is connected to the air intake pipe 32 , and the air return pipe interface 312 is connected to the air return pipe 33 .

[0031] like Figure 2 , Figure 5 , Figure 6The condensation assembly shown is composed of a condenser body 41, an integrated spiral air duct 42, a return air connection pipe 43, a fastener 44, a sealing flat gasket 47, and an external fastener 46. The condenser body 41 is made of 304 stainless steel and adopts a 1.5 mm thin-wall design. An air intake port 411 and an air return port 412 are provided at the top of the condenser body 41. The integrated spiral air duct 42 is made of aluminum, and its outer circumference has a spiral air duct 421, and a connecting hole 422 is provided at the top. The spiral design increases the length of the air duct and expands the cooling area. The gas spirals from the bottom to the top along the spiral air duct and exchanges heat through the condenser body 41, and reaches the top of the condenser at the atmospheric environment temperature. The fastener 44 fastens the integrated spiral air duct 42 in the condenser body 41, and a sealing flat gasket 47 is installed between the two structural members. Four external fasteners 46 outside the condenser body 41 fasten the condenser, the first-stage heat shield assembly, and the air intake and drainage components into one. Three sealing rings 48 are respectively arranged at the top and bottom ends of the return air connecting pipe 43, which play a sealing role at both ends to prevent the return air connecting pipe 43 from penetrating the air intake chamber. One end of the return air connecting pipe 43 is inserted into the return air port 412 on the upper part of the condenser body 41, and the other end is inserted into the return air pipe interface 312 of the air intake and drainage assembly to directly return the gas sample in the sensor mounting seat to the delivery pipeline.

[0032] like Figure 2 As shown, a first-stage heat shield assembly is arranged between the bottom end of the condenser body 41 and the water receiving pan 31, and the first-stage heat shield assembly includes a heat shield ring 49, an upper sealing ring and a lower sealing ring 45. The heat shield ring 49 is made of 10 mm thick PTFE material, and its low thermal conductivity is used to block the bottom heat from being conducted upward. The upper sealing ring and the lower sealing ring 45 play a sealing role to prevent gas leakage.

[0033] In addition, a second-stage heat shielding ring 410 is provided between the top of the condenser body 41 and the sensor mounting assembly. The second-stage heat shielding ring 410 is made of a 4 mm thick fluororubber sheet, which uses its low thermal conductivity to block the bottom heat from being conducted upward and serves as a seal for the upper and lower components.

[0034] like Figure 2The sensor installation assembly shown includes a shell 51, a T-block 52, a flow controller 54, an internal fastener 53, and an external fastener 57. The shell 51 is made of 304 material and is designed with a ∮50.5 size quick-release chuck, which can be quickly installed or removed with the gas sensor through a clamp. An air inlet 55 and an air outlet 56 are provided at the bottom of the shell 51. The air inlet 55 is connected to the air intake port 411, and the air outlet 56 is connected to the air return port 412. The internal T-block 52 is installed in the shell 51 through the internal fastener 53, forming an Ω-shaped loop structure in the internal chamber to prevent the gas from directly spraying onto the sensor probe. The flow controller 54 is installed in an inner hexagonal manner and is installed on the air return side to control the air intake volume. The default opening is M1.5, and the specifications can be replaced with 1.0, 2.0, etc. The device can reduce the gas flow through the flow control 55 to improve the cooling effect of the gas sample. The shell 51 is fastened to the condenser body 41 by four external fasteners 57, and the middle second-stage heat shield 410 plays a sealing and heat-insulating role.

[0035] The dynamic process of the present invention is divided into two parts: 1. The conduction of heat in the gas pipeline; 2. The conduction of heat in the gas extraction process and the gas sample.

[0036] The heat conduction process of the gas pipeline: the heat of the gas pipeline wall is conducted upward to the air intake and drainage assembly through the pipeline connecting seat body 21. Due to the increase in the conduction distance here and the heat dissipation of the shell, the shell temperature of the air intake and drainage assembly is slightly reduced; the heat of the air intake and drainage assembly is conducted upward to the condensation assembly through the first-stage heat assembly. Due to the increase in the conduction distance and the low thermal conductivity of the first-stage heat assembly, the heat conduction is very limited, the temperature at the bottom of the condensation assembly drops significantly, the temperature of the upper part of the condenser assembly is consistent with the ambient temperature, and the temperature of the condenser assembly is high at the bottom and low at the top; there is no heat source conduction at the bottom of the sensor mounting seat on the top of the device and the protection of the second-stage heat ring 410, and the temperature is consistent with the ambient temperature.

[0037] Gas extraction process and heat conduction of gas sample: the mixed gas flows rapidly from left to right, forming high and low pressure areas before and after the differential pressure baffle 34 of the gas extraction and drainage assembly; the gas in the high pressure area enters the gas extraction pipe 32 and flows upward; after entering the condensation assembly, the gas spirals from the bottom to the top along the spiral airway 421 and exchanges heat through the shell. When the gas reaches the top of the condensation assembly, the temperature is consistent with the ambient temperature. The condensed water generated during the cooling process flows back to the water receiving tray 31 along the spiral airway, and flows back to the gas transmission pipeline through the gas extraction pipe 32 by its own gravity; the normal temperature gas sample after cooling enters the sensor installation assembly to provide the gas sample to the sensor, and enters the return gas connection pipe 43 and the return gas pipe 33 from the hole in the right flow controller 54, and returns to the low pressure area behind the differential pressure baffle 34 (i.e., in the pipeline). The flow controller 54 can be replaced on site to reduce or increase the gas flow rate. Reducing the flow rate can reduce the total heat energy carried by the gas sample, and increasing the flow rate can reduce the sensor response time.

[0038] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “top”, “bottom”, “side” and “end” are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0039] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "set", "provided with", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A gas extraction and condensation device for coal mine gas pipeline monitoring sensor, characterized in that: It includes a pipe connection seat assembly for connecting a gas pipeline, a gas extraction and drainage assembly for automatically extracting gas in the gas pipeline and draining water, a condensation assembly for condensing the extracted gas, and a sensor installation assembly for connecting a sensor; The pipeline connection seat assembly includes a pipeline connection seat body and a first fastener, wherein the pipeline connection seat body is fixed to the gas pipeline, and the pipeline connection seat body can be detachably connected to the gas intake and drainage assembly through the first fastener; The air intake and drainage assembly includes a water receiving pan, a differential pressure baffle, an air intake pipe, and an air return pipe. The top of the water receiving pan has a cavity, and the bottom of the water receiving pan can be detachably connected to the pipeline connection seat body through a first fastener. The air intake pipe and the air return pipe are fixed to the bottom of the water receiving pan, and the tops of the air intake pipe and the air return pipe are respectively connected to the cavity of the water receiving pan, and the bottoms of the air intake pipe and the air return pipe can be connected to the gas pipeline through the pipeline connection seat body. The differential pressure baffle is fixed to the bottom of the water receiving pan and is arranged between the air intake pipe and the air return pipe, and the bottom of the differential pressure baffle is lower than the bottom of the air intake pipe and the air return pipe; The condensing assembly includes a condenser body, an integrated spiral air duct, a return air connecting pipe and a second fastener, the integrated spiral air duct is fixed in the condenser body, the return air connecting pipe is arranged in the integrated spiral air duct, an air intake port and an air return port are provided at the top of the condenser body, the air intake port is connected with the air intake pipe through the integrated spiral air duct to form an air intake circuit, the return air port is connected with the return air pipe through the return air connecting pipe to form an air return circuit, and the bottom end of the condenser body is detachably connected with the water receiving tray through the second fastener; The sensor installation assembly includes a shell, a T-block, a flow controller and a third fastener. The shell has a chamber, and the chamber is connected to the air intake port and the air return port respectively. The shell is detachably connected to the condenser body through the third fastener. The T-block is fixed in the shell, and the flow controller is installed on the air return side of the chamber. The top of the pipe connection seat body is provided with a first mounting plate, the top of the first mounting plate is provided with a groove, and a first sealing ring is provided in the groove; A first-stage heat shield assembly is provided between the bottom end of the condenser body and the water receiving pan, the first-stage heat shield assembly includes a heat shield ring, an upper sealing ring and a lower sealing ring, the bottom end of the condenser body and the top end of the water receiving pan are connected via the heat shield ring, the top end of the heat shield ring is sealed with the bottom end of the condenser body via the upper sealing ring, and the bottom end of the heat shield ring is sealed with the bottom end of the condenser body via the lower sealing ring; The gas extraction method of the gas extraction condensation device of the coal mine gas pipeline monitoring sensor comprises the following steps: (1) First, install the pipe connector assembly on the gas pipeline; (2) Then assemble the air intake and drainage assembly, the condensation assembly and the sensor installation assembly, and insert the air intake and drainage assembly into the pipeline connection seat assembly and connect it to the inner cavity of the gas transmission pipeline; (3) The air flow in the gas pipeline forms a high-pressure area and a low-pressure area on both sides of the differential pressure baffle. The high-pressure gas enters the integrated spiral airway through the air intake pipe. The gas exchanges heat through the integrated spiral airway. The condensed water generated during the cooling process flows back to the gas pipeline along the integrated spiral airway. The cooled gas provides a gas sample to the sensor and flows back to the gas pipeline through the flow controller, the return air connecting pipe, and the return air pipe in turn.

2. The gas extraction and condensation device for coal mine gas pipeline monitoring sensor according to claim 1 is characterized in that: The bottom of the water receiving tray is provided with a second mounting tray, the bottom of the second mounting tray is provided with a groove, the first mounting tray and the second mounting tray are sealedly connected inside by a first sealing ring, and the first mounting tray and the second mounting tray are detachably connected outside by a first fastener.

3. The gas extraction and condensation device for coal mine gas pipeline monitoring sensor according to claim 1 is characterized in that: The top end of the integrated spiral air duct is detachably connected to the condenser body via a fourth fastener.

4. The gas extraction and condensation device for coal mine gas pipeline monitoring sensor according to claim 1 is characterized in that: The top end and the bottom end of the return air connecting pipe are respectively provided with sealing members.

5. The gas extraction and condensation device for coal mine gas pipeline monitoring sensor according to claim 1 is characterized by: The T-block is fixed at the center of the housing by a fifth fastener.

6. The gas extraction and condensation device for coal mine gas pipeline monitoring sensor according to claim 1 is characterized by: A second-stage heat shielding component is arranged between the condenser body and the shell.

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