Pretreatment system and device for coal gas analysis sampling

Abstract

The invention discloses a pretreatment system and device for coal gas analysis sampling, and belongs to the field of system treatment and analysis systems of analysis instruments containing tar, dust, acid gas and explosive gas. The pretreatment system for coal gas analysis sampling comprises an analysis box connected with a sample gas conveying pipe and an analysis instrument connected with the analysis box through a pipeline, a vapor-liquid separator, a cyclone condenser, a condensation filter and a paper medium filtering device which are sequentially connected through pipelines according to the sample gas conveying direction are arranged in the analysis box. According to the pretreatment system for coal gas analysis sampling, after being subjected to vapor-liquid separation through the vapor-liquid separator, the cyclone condenser and the condensation filter, clean sample gas sequentially enters the paper medium filtering device and the switching valve and finally enters an external analysis instrument to be analyzed; therefore, important parameters such as oxygen content, carbon monoxide content and carbon dioxide content of the gasified raw gas can be analyzed in time.

Description

Technical Field

[0001] The invention relates to the technical field of system processing and analysis system of analysis instruments containing tar, dust, acid gas and explosive gas, and in particular to a preprocessing system for coal gas analysis sampling. Background Art

[0002] At present, in the industrial production process of raw coal gas, the oxygen content of raw coal gas is the main cause of explosion in gasification treatment system. In the fields of crushed coal pressurized gasification, Lurgi gasification, coke oven gas, etc., raw coal gas contains various destructive gases that are not conducive to the operation of analyzers, such as benzene, long-chain hydrocarbon substances, dust in coal gas, etc., which directly affect the normal operation of analyzers. At present, the analysis method for this project generally uses absorption analysis, that is, using activated carbon to directly absorb or cool the above harmful components.

[0003] The composition of raw gas directly affects the safe production of raw gas. When the oxygen content of raw gas is too high, it will cause the raw gas to deflagrate or directly explode, threatening safe production. Therefore, it is extremely urgent to effectively determine the oxygen content in gas. Summary of the invention

[0004] The present invention provides a pretreatment system and device for gas analysis sampling, aiming to solve the problem mentioned in the background technology that the current analysis methods are unable to timely and effectively process impurities in the raw coal gas that affect the normal operation of the analysis instrument, so that the important parameters of the gasified raw coal gas, such as oxygen content, carbon monoxide content and carbon dioxide content, can be analyzed in time.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pretreatment system for coal gas analysis sampling, comprising a storage tank, a gas-liquid separator connected to the outlet end of a washing tank, a cyclone condenser connected to the outlet end of the gas-liquid separator, a condensation filter connected to the outlet end of the cyclone condenser, and a paper filter device connected to the outlet end of the condensation filter, wherein a switching valve is provided at the outlet end of the paper filter device; the switching valve is a three-way valve, one port of the switching valve is connected to the outlet end of the paper filter device, and the other two ports are respectively connected to the storage tank and an external analysis instrument.

[0006] When pre-treating the coal gas, the clean (not containing tar, dust, long-chain hydrocarbons) water-containing coal gas sample is first vented through a high point to vent the excess sample gas, and the remaining approximately 1.5L / min sample gas is separated into gas and liquid through a vapor-liquid separator, a cyclone condenser, and a condensation filter, and then enters the paper filter device in turn for filtration again, and finally enters the analyzer for analysis through a switching valve.

[0007] Preferably, a pressure gauge is provided on the connecting pipe between the cyclone condenser and the washing tank.

[0008] Preferably, the pretreatment system also includes a condensate storage tank, a connecting pipe for connecting the gas-liquid separator with the condensate storage tank, and a three-way pipe for connecting the cyclone condenser and the condensation filter with the condensate storage tank, and a float valve is provided at one end of the connecting pipe and the three-way pipe connected to the condensate storage tank.

[0009] Preferably, the cyclone condenser is provided with an air inlet pipe for introducing external air into the interior of the cyclone filter, an air pump is provided at one end of the air inlet pipe away from the cyclone filter, and a one-way valve is provided on the air inlet pipe.

[0010] Preferably, the paper filter device comprises at least two paper filters connected in parallel.

[0011] Preferably, a rotor flowmeter is provided on the connecting pipeline between the external analytical instrument and the switching valve.

[0012] Preferably, it comprises a pretreatment system for gas analysis sampling as described in any one of the above.

[0013] The pretreatment system for coal gas analysis sampling has a simple structure and is easy to use. When pretreating the coal gas, the clean (not containing tar, dust, and long-chain hydrocarbons) water-containing coal gas sample is first vented through a high point to vent the excess sample gas, and the remaining approximately 1.5L / min sample gas is separated by gas-liquid separation through a gas-liquid separator, a cyclone condenser, and a condensation filter, and then enters a paper filter device in sequence for filtration again, and then enters an analyzer through a switching valve for analysis; the condensate separated from the sample gas by the gas-liquid separator and the condensate separated by the condensation filter are respectively discharged into a condensate storage tank through a connecting pipe and a three-way pipe, and are discharged regularly by a solenoid valve at the bottom of the tank; the air inlet pipe is used to introduce external air into the interior of the cyclone filter, the air pump can adjust the rate of air introduction, and the one-way valve prevents air backflow; by connecting at least two paper filters in parallel, the filtration pressure of a single paper filter is reduced, thereby extending the service life of the paper filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A flow chart of a pretreatment system for gas analysis sampling.

[0015] In the figure:

[0016] 1. Analysis box;

[0017] 2. Analytical instruments;

[0018] 3. Vapor-liquid separator;

[0019] 4. Cyclone condenser;

[0020] 5. Coagulation filter;

[0021] 6. Paper filter device; 601. Paper filter;

[0022] 7. Switching valve;

[0023] 8. Pressure gauge;

[0024] 9. Condensate storage tank;

[0025] 10. Connecting pipe;

[0026] 11. Tee pipe;

[0027] 12. Float valve;

[0028] 13. Air inlet pipe;

[0029] 14. Air pump;

[0030] 15. Check valve;

[0031] 16. Rotor flow meter. DETAILED DESCRIPTION

[0032] 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 described embodiments 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.

[0033] Example 1

[0034] This embodiment provides a pre-processing system for gas analysis sampling, such as Figure 1 As shown, the pretreatment system for gas analysis sampling includes a storage tank 1, a gas-liquid separator 3 connected to the outlet end of a washing tank 2, a cyclone condenser 4 connected to the outlet end of the gas-liquid separator 3, a condensation filter 5 connected to the outlet end of the cyclone condenser 4, and a paper filter device 6 connected to the outlet end of the condensation filter 5, wherein a switching valve 7 is provided at the outlet end of the paper filter device 6; the switching valve 7 is a three-way valve, one port of the switching valve 7 is connected to the outlet end of the paper filter device 6, and the other two ports are connected to the storage tank 1 and an external analysis instrument, respectively.

[0035] When pre-treating the coal gas, the clean (not containing tar, dust, long-chain hydrocarbons) water-containing coal gas sample is first vented through a high point to vent the excess sample gas, and the remaining approximately 1.5L / min sample gas is separated into gas and liquid by the vapor-liquid separator 3, the cyclone condenser 4 and the condensation filter 5, and then enters the paper filter device 6 in sequence for filtration again, and finally enters the analytical instrument for analysis through the switching valve 7.

[0036] In one embodiment, a pressure gauge 8 is provided on the connecting pipe between the gas-liquid separator 3 and the washing tank 2 .

[0037] In this embodiment, refer to Figure 1 , which is convenient for observing the internal pressure of the sample gas entering the gas-liquid separator 3.

[0038] In one embodiment, the pretreatment system also includes a condensate storage tank 9, a connecting pipe 10 for connecting the gas-liquid separator 3 with the condensate storage tank 9, and a three-way pipe 11 for connecting the cyclone condenser 4 and the condensation filter 5 with the condensate storage tank 9. The connecting pipe 10 and the three-way pipe 11 are both provided with a float valve 12 at one end connected to the condensate storage tank 9.

[0039] In this embodiment, refer to Figure 1 The condensate separated from the sample gas by the gas-liquid separator 3 is discharged into the condensate storage tank 9 through the connecting pipe 10, and the condensate separated by the condensation filter 5 is discharged into the condensate storage tank 9 through the three-way pipe 11, and is discharged regularly by the tank bottom solenoid valve.

[0040] In one embodiment, the cyclone condenser 4 is provided with an air inlet pipe 13 for introducing external air into the cyclone filter 4 , an air pump 14 is provided at one end of the air inlet pipe 13 away from the cyclone filter 4 , and a one-way valve 15 is provided on the air inlet pipe 13 .

[0041] In this embodiment, refer to Figure 1 The air inlet pipe 13 is used to introduce external air into the cyclone filter 4, the air pump 14 can adjust the speed of introducing air, and the one-way valve 15 prevents air from flowing back.

[0042] In one embodiment, the paper filter device 6 includes at least two paper filters 601 connected in parallel.

[0043] In this embodiment, refer to Figure 1 By connecting at least two paper filters 601 in parallel, the pressure of a single paper filter 601 is reduced, thereby extending the service life of the paper filter 601.

[0044] In one embodiment, a rotor flowmeter 16 is provided on the connecting pipeline between the external analytical instrument and the switching valve 7 .

[0045] In this embodiment, refer to Figure 1 By setting a rotor flowmeter 16 on the connecting pipeline between the external analytical instrument and the switching valve 7, the rotor flowmeter 16 has the advantages of small pressure loss, large detection range, easy use, and strong compatibility, and is suitable for measuring gas flow with low flow rate and small flow.

[0046] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A pretreatment system for gas analysis and sampling, characterized in that: It comprises a storage tank (1), a gas-liquid separator (3) connected to the outlet end of a washing tank (2), a cyclone condenser (4) connected to the outlet end of the gas-liquid separator (3), a condensation filter (5) connected to the outlet end of the cyclone condenser (4), and a paper filter device (6) connected to the outlet end of the condensation filter (5), wherein the outlet end of the paper filter device (6) is provided with a switching valve (7); The switching valve (7) is a three-way valve, one port of the switching valve (7) is connected to the outlet end of the paper medium filtering device (6), and the other two ports are respectively connected to the storage tank (1) and an external analytical instrument.

2. The pretreatment system for gas analysis sampling according to claim 1, characterized in that: A pressure gauge (8) is provided on the connecting pipe between the cyclone condenser (4) and the washing tank (2).

3. The pretreatment system for gas analysis sampling according to claim 1, characterized in that: The pretreatment system further comprises a condensate storage tank (9), a connecting pipe (10) for connecting the gas-liquid separator (3) with the condensate storage tank (9), and a three-way pipe (11) for connecting the cyclone condenser (4) and the condensation filter (5) with the condensate storage tank (9), and a float valve (12) is provided at one end of the connecting pipe (10) and the three-way pipe (11) connected to the condensate storage tank (9).

4. The pretreatment system for gas analysis sampling according to claim 1, characterized in that: The cyclone condenser (4) is provided with an air inlet pipe (13) for introducing external air into the interior of the cyclone filter (4); an air pump (14) is provided at one end of the air inlet pipe (13) away from the cyclone filter (4); and a one-way valve (15) is provided on the air inlet pipe (13).

5. The pretreatment system for gas analysis sampling according to claim 1, characterized in that: The paper medium filtering device (6) comprises at least two paper medium filters (601) connected in parallel.

6. The pretreatment system for gas analysis sampling according to claim 1, characterized in that: A rotor flowmeter (16) is provided on the connecting pipeline between the external analytical instrument and the switching valve (7).

7. A pre-processing device for gas analysis sampling, characterized in that: A pretreatment system for coal gas analysis sampling comprising the system described in any one of claims 1-6.

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