Gas filtering device

Abstract

The utility model discloses a gas filtering device, which relates to the technical field of filtering mechanisms and comprises a sampling pipe component, a filtering mechanism, a condensate draining mechanism, a heating mechanism and a gas outlet pipe component, the filtering mechanism and the condensate draining mechanism are arranged in a case, and the sampling pipe component and the gas outlet pipe component are respectively connected to the side wall of the case. An air inlet pipe of the sampling pipe assembly is communicated with an air inlet of the filtering mechanism, an exhaust pipe of the filtering mechanism penetrates through the heating mechanism and is communicated with the air outlet pipe assembly, a condensate drain port of the filtering mechanism is communicated with the condensate drain mechanism, and the condensate drain mechanism is communicated with the sample gas flow channel. According to the utility model, condensed water in the sample gas can be separated out through the filtering mechanism and is discharged back to the original sample gas through the condensation pump, so that the problems of high dust, high temperature and high corrosivity in the sample gas are solved, clean gas is obtained, and the maintenance time of online gas analysis is reduced; the heating mechanism is arranged, so that crystallization and blockage caused by too low temperature of the sample gas can be avoided, and the dust filter element is effectively protected.

Description

Technical Field

[0001] The utility model relates to the technical field of filtering mechanisms, in particular to a gas filtering device. Background Art

[0002] Industrial kilns, boilers, auxiliary processing equipment, waste incinerators and motor vehicles will cause waste gas emissions. When conducting waste gas emission test analysis, a specific sampling device must be used to extract a certain amount of gas from the exhaust gas and send it to the exhaust gas analyzer for analysis and calculation to detect whether the waste gas emissions meet the relevant standard requirements.

[0003] There are two main problems with the existing exhaust gas sampling device during the sampling test process. One is the dust problem. The dust brought by the exhaust gas sample during the test process can easily clog the filter element in the probe, thereby affecting the air intake and test results. The second is the condensation problem. During the sampling test process, the exhaust gas sample is not heated, resulting in a drop in temperature, which will form condensate and salt crystals. The combination of condensate and dust and salt crystals can easily clog the filter element, which will change the gas intake volume in the exhaust gas sample, thereby causing errors in the test results. Utility Model Content

[0004] The purpose of the utility model is to provide a gas filtering device to solve the problems existing in the above-mentioned prior art, so that the dust filter element can be cleaned by condensed water, the maintenance time of the equipment can be extended, and crystallization and blockage caused by too low temperature can be avoided.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The utility model provides a gas filtering device, comprising a sampling tube assembly, a filtering mechanism, a condensate removal mechanism, a heating mechanism and an air outlet pipe assembly, wherein the filtering mechanism and the condensate removal mechanism are arranged in a chassis, the sampling tube assembly and the air outlet pipe assembly are respectively connected to the side walls of the chassis, the air inlet pipe of the sampling tube assembly is connected to the air inlet port of the filtering mechanism, the exhaust pipe of the filtering mechanism passes through the heating mechanism and is connected to the air outlet pipe assembly, the condensate removal port of the filtering mechanism is connected to the condensate removal mechanism, and the condensate removal mechanism is connected to the sample gas.

[0007] Preferably, the heating mechanism includes two heating blocks with a groove in the middle, the heating blocks can be spliced together to form a hollow hole, the exhaust pipe of the filtering mechanism passes through the hollow hole, and the heating blocks are fixed in the chassis.

[0008] Preferably, the sampling tube assembly includes a dust filter element, an air inlet pipe, a support tube and a heating plate. One end of the support tube is fixedly connected to the chassis, and the dust filter element is provided on the other end. The air inlet pipe is connected to the dust filter element. The support tube is provided with a full-length heating plate, and the heating plate is provided in contact with the air inlet pipe.

[0009] Preferably, the condensate discharge mechanism includes a condensate discharge pump and a condensate discharge pipe, the condensate discharge pump is connected to the sample flow channel through the condensate discharge pipe, the condensate discharge pump is fixed in the chassis through a bracket, and the condensate discharge pipe passes through the support tube and contacts the heating plate.

[0010] Preferably, the filtering mechanism includes a filter tank, a filter layer and a fixing frame. The filter tank is fixed in the chassis through the fixing frame, and the filter layer is provided in the filter tank.

[0011] Preferably, the material of the filter layer includes ceramic rings or polyvinylidene fluoride particles.

[0012] Preferably, a back-blowing device is provided in the chassis, and the back-blowing device includes an air tank and a solenoid valve. The air tank is connected to the back-blowing pipe through a pipeline. The back-blowing pipe passes through the sampling tube assembly and the outlet is located above the dust filter element of the sampling tube assembly. The solenoid valve is provided on the pipeline, and the air tank is fixed in the chassis by a bracket.

[0013] Preferably, the air outlet pipe assembly includes a protective pipe, an air outlet pipe and a heating tape, the end of the protective pipe is connected to the chassis, the air outlet pipe passes through the protective pipe and is connected to the exhaust pipe, and the heating tape is wound around the air outlet pipe.

[0014] Compared with the prior art, the utility model has achieved the following technical effects:

[0015] The utility model can separate out the condensed water in the sample gas through the filtering mechanism and discharge it back into the original sample gas through the condensation pump, thereby solving the problems of high dust, high temperature and high corrosiveness in the sample gas, thereby obtaining clean gas and reducing the maintenance time of online gas analysis; the provision of a heating mechanism can avoid crystallization and blockage caused by the sample gas temperature being too low, and effectively protect the dust filter element. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a schematic structural diagram of the gas filtering device of the present utility model;

[0018] Figure 2 This is a schematic diagram of the top view of the gas filtering device of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure of the sampling tube assembly in the present invention;

[0020] Figure 4 This is a schematic diagram of the partial structure of the gas filtering device of the utility model;

[0021] Among them: 1-filter mechanism, 2-backflush device, 3-condensate discharge mechanism, 4-chassis, 5-heating block, 6-outlet pipe, 7-inlet pipe, 8-dust filter element, 9-support tube, 10-heating plate, 11-filter tank, 12-filter layer, 13-bracket, 14-gas storage tank, 15-solenoid valve, 16-condensate discharge pump, 17-protective tube, 18-heating tape, 19-condensate discharge pipe, 20-backflush pipe, 21-quick plug connector. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The purpose of the utility model is to provide a gas filtering device to solve the problems existing in the prior art, so that the dust filter element can be cleaned by condensed water, the maintenance time of the equipment can be extended, and crystallization and blockage caused by too low temperature can be avoided.

[0024] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0025] like Figures 1 to 4 As shown: This embodiment provides a gas filtering device, including a sampling tube assembly, a filtering mechanism 1, a condensate discharge mechanism 3, a heating mechanism and an air outlet pipe assembly. The filtering mechanism 1 and the condensate discharge mechanism 3 are arranged in a chassis 4, and the sampling tube assembly and the air outlet pipe assembly are respectively connected to the side walls of the chassis 4. The air inlet pipe 7 of the sampling tube assembly is connected to the air inlet of the filtering mechanism 1, the exhaust pipe of the filtering mechanism 1 passes through the heating mechanism and is connected to the air outlet pipe assembly, the condensate discharge port of the filtering mechanism 1 is connected to the condensate discharge mechanism 3, and the condensate discharge mechanism 3 is connected to the sample gas.

[0026] Preferably, the heating mechanism in this embodiment includes two heating blocks 5 with a groove in the middle. The heating blocks 5 can be spliced together to form a hollow hole. The exhaust pipe of the filter mechanism 1 passes through the hollow hole to heat the sample gas in the exhaust pipe to prevent condensation. The heating block 5 is fixed in the chassis 4. The heating temperature control range of the heating block 5 is greater than 150°C.

[0027] Preferably, the sampling tube assembly in this embodiment includes a dust filter 8, an air inlet pipe 7, a support tube 9 and a heating plate 10. One end of the support tube 9 is fixedly connected to the chassis 4, and the other end is provided with a dust filter 8. The air inlet pipe 7 is connected to the dust filter 8. A full-length heating plate 10 is provided in the support tube 9. The heating plate 10 is provided in contact with the air inlet pipe 7 to provide heat for the air inlet pipe 7 to prevent condensation of the sample gas.

[0028] Preferably, the condensate drain mechanism 3 in this embodiment includes a condensate drain pump 16 and a condensate drain pipe 19. The condensate drain pump 16 is connected to the sample flow channel via the condensate drain pipe 19. The condensate drain pump 16 is fixed to the chassis 4 via a bracket 13. The condensate drain pipe 19 passes through the support tube 9 and contacts the heater 10. After heating, the condensate is less likely to corrode the equipment. The heating temperature control range of the heater 10 is greater than 150°C.

[0029] Preferably, the filter mechanism 1 in this embodiment includes a filter tank 11, a filter layer 12 and a fixing frame. The filter tank 11 is fixed in the chassis 4 by the fixing frame, and the filter layer 12 is provided (contained) in the filter tank 11. The material of the filter layer 12 includes ceramic rings or polyvinylidene fluoride particles. There are particles of varying sizes in the filter tank 11, which can increase the contact area when the sample gas passes through. The sample gas can filter out tiny particulate matter and moisture in the sample gas after natural cooling, and will not change the gas components in the sample gas. The filter material is preferably acid-resistant and alkali-resistant non-stainless steel material.

[0030] Preferably, in this embodiment, a backflush device 2 is provided in the chassis 4. The backflush device 2 includes an air tank 14 and a solenoid valve 15. The air tank 14 is connected to a backflush pipe 20 through a pipeline. The backflush pipe 20 passes through the sampling tube assembly and its outlet is located above the dust filter element 8 of the sampling tube assembly. The solenoid valve 15 is provided on the pipeline. The air tank 14 is fixed in the chassis 4 by a bracket 13. Among them, a three-port quick-connect connector 21 is provided on the end of the support tube 9 of the sampling tube assembly. The quick-connect connector 21 is respectively connected to the condensate drain pipe 19, the air inlet pipe 7 and the backflush pipe 20 located in the support tube 9. The backflush pipe 20 is connected to the air tank 14, the air inlet pipe 7 is connected to the filter tank 11, and the condensate drain pipe 19 is connected to the condensate drain pump 16. When the dust filter element 8 is blocked, the pressure airflow released by the air tank 14 can backflush the dust filter element 8, thereby achieving the purpose of self-cleaning of the dust filter element 8.

[0031] Preferably, the outlet pipe assembly in this embodiment includes a protective tube 17, an outlet pipe 6, and a heating tape 18. The end of the protective tube 17 is connected to the chassis 4. The outlet pipe 6 passes through the protective tube 17 and communicates with the exhaust pipe. The heating tape 18 is wrapped around the outlet pipe 6 to prevent condensation of the sample gas. The heating temperature control range of the heating tape 18 is greater than 150°C.

[0032] The specific working process of the gas filtering device of this embodiment is as follows: the sample gas first passes through the dust filter element 8 to filter out fine particles in the sample gas, and then enters the filtering mechanism 1 through the air inlet pipe 7 of the sampling tube assembly. After natural cooling, the water and particulate matter in the sample gas are precipitated. The condensed water precipitated in the sample gas is discharged to the condensate discharge pipe 19 through the condensate pump. The condensed water is vaporized by the heating plate 10 at the condensate discharge pipe 19 and discharged back into the original sample gas. The sample gas is heated by the heating mechanism (heating belt 18) and discharged through the air outlet pipe 6 for detection. General detection instruments include CO, O2 or H2S detectors or sensors.

[0033] This embodiment is to solve the problems of high dust, high temperature and high corrosiveness in the sample gas so as to obtain a gas with clean components to be detected (generally the components to be detected are CO, O2, H2S), reduce the time of online gas analysis, and heat the condensed water in the sample gas through the heating plate 10 to reduce the corrosiveness of the condensed water, thereby extending the maintenance time of the equipment; the sampling tube assembly provided with the heating plate 10 is extended into the high-temperature sample gas, which can avoid the temperature being too low and causing crystallization and clogging on the dust filter element 8; at the same time, a backflush device 2 is provided to effectively avoid clogging of the dust filter element 8, which can well solve the influence of condensate and dust on the sample gas and the sample gas pipeline.

[0034] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A gas filtering device, characterized in that: It includes a sampling tube assembly, a filtering mechanism, a condensate discharge mechanism, a heating mechanism and an air outlet pipe assembly. The filtering mechanism and the condensate discharge mechanism are arranged in a chassis. The sampling tube assembly and the air outlet pipe assembly are respectively connected to the side walls of the chassis. The air inlet pipe of the sampling tube assembly is connected to the air inlet of the filtering mechanism. The exhaust pipe of the filtering mechanism passes through the heating mechanism and is connected to the air outlet pipe assembly. The condensate discharge port of the filtering mechanism is connected to the condensate discharge mechanism, and the condensate discharge mechanism is connected to the sample gas.

2. The gas filtering device according to claim 1, characterized in that: The heating mechanism includes two heating blocks with slots in the middle. The heating blocks can be spliced together to form a hollow hole. The exhaust pipe of the filter mechanism passes through the hollow hole. The heating blocks are fixed in the chassis.

3. The gas filtering device according to claim 1, characterized in that: The sampling tube assembly includes a dust filter element, an air intake pipe, a support tube and a heating plate. One end of the support tube is fixedly connected to the chassis, and the dust filter element is provided on the other end. The air intake pipe is connected to the dust filter element. The support tube is provided with a full-length heating plate, and the heating plate is provided in contact with the air intake pipe.

4. The gas filtering device according to claim 3, characterized in that: The condensate discharge mechanism includes a condensate discharge pump and a condensate discharge pipe. The condensate discharge pump is connected to the sample flow channel through the condensate discharge pipe. The condensate discharge pump is fixed in the chassis through a bracket. The condensate discharge pipe passes through the support pipe and contacts the heating plate.

5. The gas filtering device according to claim 1, characterized in that: The filtering mechanism includes a filtering tank, a filtering layer and a fixing frame. The filtering tank is fixed in the chassis through the fixing frame, and the filtering layer is arranged in the filtering tank.

6. The gas filtering device according to claim 5, characterized in that: The material of the filter layer includes ceramic rings or polyvinylidene fluoride particles.

7. The gas filtering device according to claim 1, characterized in that: A back-blowing device is provided in the chassis, and the back-blowing device includes an air tank and a solenoid valve. The air tank is connected to the back-blowing pipe through a pipeline. The back-blowing pipe passes through the sampling tube assembly and the outlet is located above the dust filter element of the sampling tube assembly. The solenoid valve is provided on the pipeline, and the air tank is fixed in the chassis by a bracket.

8. The gas filtering device according to claim 1, characterized in that: The air outlet pipe assembly includes a protective pipe, an air outlet pipe and a heating tape. The end of the protective pipe is connected to the chassis. The air outlet pipe passes through the protective pipe and is connected to the exhaust pipe. The heating tape is wound around the air outlet pipe.

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