CN210180780U - Coal gas on-line analysis preprocessing device - Google Patents
Coal gas on-line analysis preprocessing device Download PDFInfo
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- CN210180780U CN210180780U CN201920656478.8U CN201920656478U CN210180780U CN 210180780 U CN210180780 U CN 210180780U CN 201920656478 U CN201920656478 U CN 201920656478U CN 210180780 U CN210180780 U CN 210180780U
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Abstract
The utility model discloses a coal gas online analysis pretreatment device, which comprises a sampling device, a primary oil and dust removing device, a secondary oil and dust removing device and a dehumidifying device which are connected in sequence through pipelines; the sampling device is used for taking out coal gas from the gas outlet drill hole or the coal gas pipeline, the primary and secondary oil and dust removal devices are used for removing impurities which are easy to settle and condense in the coal gas from a gas phase, the desulfurization device is used for removing sulfides contained in the coal gas, and the dehumidification device is used for removing liquid water and gaseous water contained in the coal gas. The utility model provides a coal gas on-line analysis preprocessing device adopts multi-stage filtration, absorption, condensation process to carry out the preliminary treatment to coal gas, can get rid of various impurities such as tar, dirt, water of underground coal gas fast, provides clean, constant temperature, stable air supply for analytical equipment to have convenient operation, get rid of efficiently, get rid of thorough advantage.
Description
Technical Field
The utility model relates to a coal underground gasification technical field, concretely relates to coal gas on-line analysis preprocessing device.
Background
Underground coal gasification is a process in which coal located underground is burned in a controlled manner and combustible gas is produced by the thermal and chemical action of the coal. Coal gasification is one of the important forms of coal conversion, and plays a role in the beginning and the end of various production processes. The synthesis raw material gas of the coal chemical industry plays an important role in the coal chemical industry.
The underground coal gasification technology can directly convert underground coal into coal gas or synthetic gas through thermal action and chemical reaction. As a target product in the underground gasification production process, the coal gas component directly reflects the quality of the underground gasification process, and is an important basis for adjusting the technological parameters of the underground gasification and an important index for monitoring the process. The coal underground gasification gas component analysis mainly aims at the main gas components of hydrogen, carbon monoxide, methane, carbon dioxide, nitrogen and oxygen in the gas. The off-line analysis method has the main defects that the analysis result has hysteresis, and the time from sampling to analyzing the result of one sample is about 25 minutes generally, so that the information under the abnormal condition of the gasification process is difficult to obtain in time, and the process operation is inconvenient; the online analysis can monitor and analyze the components of the coal gas in real time and has better timeliness, so that the online analysis method of the components of the coal gas is a better coal gas analysis method for a large-scale underground coal gasification industrial production system, the workload of manual analysis can be greatly reduced, and the timeliness of the analysis result is improved.
The on-line analysis aims at the main gas components in the coal gas, but the high-temperature coal gas discharged from an underground gasification gas outlet drill hole is complex in composition (also called as raw coal gas or crude gas or wet coal gas), and generally contains a large amount of water vapor, tar, solid particles (ash, coal slag, rock particles and the like), liquid drops (water and oil drops entrained by the coal gas) and the like besides main gas components, and a small amount or trace amount of impurities such as hydrogen sulfide, hydrogen chloride, hydrogen cyanide, ammonia, phenol and the like, wherein the existence of the impurity components seriously influences the analysis of the coal gas components, such as pollution and blockage of a sample injector, a chromatographic column, a detector and the like of a chromatograph, and the paralysis and even damage of the chromatographic system are caused by corroding pipelines. Thus, in order to ensure stable operation of the on-line analysis system, it is necessary to treat the impurity components.
The existing gas online analysis pretreatment devices are various, the number of the gas pretreatment devices for underground coal gasification is relatively small, and the Chinese utility model patent with the publication number of CN2685564Y discloses a coal underground gasification gas composition online analysis pretreatment device, which adopts a water washing mode to remove impurities such as tar and hydrogen sulfide, and has the problem that the pipeline is easy to block in winter due to the overhigh water content in the gas in the actual use process; moreover, the coal gas has high tar and dust content, and a front-end sampling pipeline is easily blocked by tar and dust, so that the long-term running stability of the on-line analysis system is influenced. In addition, when the water washing adopts lime water solution to desulfurize, part of carbon dioxide can be removed, so that the measurement result of the gas component is inaccurate.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coal gas on-line analysis preprocessing device adopts multiple stage filtration, absorption, condensation process to carry out the preliminary treatment to coal gas, has improved the treatment effect of impurity in the coal gas, and long-term operation is stable, and the measuring result is more accurate.
In order to achieve the above object, the present invention provides the following technical solutions:
an on-line analysis pretreatment device for coal gas, comprising:
a sampling device for taking gas from the gas outlet bore or gas pipeline;
the primary oil and dust removing device is connected with the sampling device through a pipeline and is used for removing impurities which are easy to settle and condense in the coal gas from a gas phase;
the secondary oil and dust removing device is connected with the primary oil and dust removing device through a pipeline and is used for further removing impurities which are contained in the coal gas and are easy to settle and condense;
the desulfurization device is connected with the secondary oil and dust removal device through a pipeline and is used for removing sulfides contained in the coal gas;
and the dehumidifying device is connected with the desulfurizing device through a pipeline and is used for removing liquid water and gaseous water contained in the coal gas.
Preferably, the on-line gas analysis pretreatment device further comprises:
and the steady flow pressure stabilizer is connected with the dehumidifying device through a pipeline and is used for stabilizing the pressure and the flow of the coal gas.
Preferably, a drying device for controlling the humidity of the coal gas is connected between the dehumidifying device and the flow stabilizing and pressure stabilizing device.
Preferably, the on-line gas analysis pretreatment device further comprises:
and the precise filtering device is connected with the flow stabilizing and pressure stabilizing device through a pipeline and is used for removing micro-particles and micro-droplets in the coal gas.
Preferably, the on-line gas analysis pretreatment device further comprises:
and the gas flow metering device is connected with the precise filtering device through a pipeline and is used for metering the gas flow.
Preferably, the on-line gas analysis pretreatment device further comprises:
and the back flushing device is connected between the sampling device and the primary oil and dust removing device and is used for purging the sampling device and pipelines between the sampling device and the primary oil and dust removing device.
Preferably, the on-line gas analysis pretreatment device further comprises:
and the heat preservation device is arranged on the pipeline and used for heating the pipeline.
Preferably, the on-line gas analysis pretreatment device further comprises:
the standby first-stage oil and dust removing device, the standby second-stage oil and dust removing device and the standby desulfurizing device are connected in series and are arranged in parallel with the first-stage oil and dust removing device, the second-stage oil and dust removing device and the desulfurizing device which are connected in series through pipelines;
a standby drying device disposed in parallel with the drying device.
Preferably, the on-line gas analysis and pretreatment device further comprises a control device, wherein the control device comprises a controller, an electromagnetic valve and a sensor, and the electromagnetic valve and the sensor are electrically connected with the controller;
the solenoid valve includes:
the first electromagnetic valve is connected between the sampling device and the primary oil and dust removing device;
a second electromagnetic valve connected between the desulfurization device and the dehumidification device;
a third electromagnetic valve connected between the dehumidifying device and the drying device;
the fourth electromagnetic valve is connected between the drying device and the flow stabilizing and pressure stabilizing device;
the fifth electromagnetic valve is connected between the pipeline between the sampling device and the primary oil and dust removing device and the back flushing device;
the sixth electromagnetic valve is connected between the back flushing device and the primary oil and dust removing device;
the seventh electromagnetic valve is connected between the primary oil and dust removing device and the secondary oil and dust removing device;
the eighth electromagnetic valve is connected between the secondary oil and dust removing device and the desulfurization device;
the ninth electromagnetic valve is connected between the flow stabilizing and pressure stabilizing device and the precise filtering device;
a tenth solenoid valve connected after the microfiltration device;
the sensor includes:
the pressure sensor is arranged on a coal gas outlet of the primary oil and dust removing device;
the temperature sensor is arranged on a gas outlet of the dehumidification device;
and the humidity sensor is arranged on a gas outlet of the precise filtering device.
The utility model provides a coal gas on-line analysis preprocessing device adopts multi-stage filtration, absorption, condensation process to carry out the preliminary treatment to coal gas, can get rid of various impurities such as tar, dirt, water of underground coal gas fast, provides clean, constant temperature, stable air supply for analytical equipment to have convenient operation, get rid of efficiently, get rid of thorough advantage.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.
FIG. 1 is a schematic structural view of an on-line gas analysis and pretreatment device provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a gas on-line analysis pretreatment device according to another embodiment of the present invention;
FIG. 3 is a schematic structural view of an on-line gas analysis and pretreatment device according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a coal gas online analysis pretreatment device according to another embodiment of the present invention.
Description of reference numerals:
1. a sampling device; 2. a primary oil and dust removing device; 3. a secondary oil and dust removing device; 4. a desulfurization unit; 5. a dehumidifying device; 6. a flow stabilizing and pressure stabilizing device; 7. a drying device; 8. a precision filtration device; 9. a gas flow metering device; 9a, a first flow meter; 9b, a second flow meter; 10. a back flushing device; 11. a heat preservation device; 12. a control device;
2', a first-level oil and dust removing device is reserved; 3', a second-stage oil and dust removing device is reserved; 4', a spare desulfurization device; 7', a standby drying device; 10', a spare back-blowing device;
V1-V10, first-tenth solenoid valves; v11, sampling valve; v '5-V' 8, a fifth standby electromagnetic valve and an eighth standby electromagnetic valve;
s1, a pressure sensor; s2, a temperature sensor; s3, a humidity sensor.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising … …" or "comprising … …" does not exclude the presence of additional elements in a process, method, article, or terminal that comprises the element. Further, herein, "greater than," "less than," "more than," and the like are understood to exclude the present numbers; the terms "above", "below", "within" and the like are to be understood as including the number.
Example one
As shown in figure 1, the on-line gas analysis and pretreatment device comprises a sampling device 1, a primary oil and dust removing device 2, a secondary oil and dust removing device 3, a desulfurization device 4 and a dehumidification device 5 which are sequentially connected through pipelines. When the gas is analyzed and detected on line, the dehumidifying device 5 is connected with the gas on-line analyzer through a pipeline.
The sampling device 1 is used for taking gas from an outlet borehole or gas pipeline, and the sampling device 1 comprises a sampling pipe and a sampling valve V11. One end of the sampling tube is positioned in the gas outlet drilling hole or the gas pipeline, and the other end of the sampling tube is positioned outside the gas outlet drilling hole or the gas pipeline and is connected with a sampling valve V11. The sampling tube and the gas outlet drill hole or the gas pipeline can be welded and/or connected by flanges. Preferably, the length of the sampling tube in the gas outlet drill hole or the gas pipeline is 1/3-2/3 of the diameter of the gas outlet drill hole or the gas pipeline.
The primary oil and dust removing device 2 is used for removing the impurity components which are easy to settle and condense, such as tar, solid particles, liquid drops and the like, contained in the coal gas from the gas phase. The primary oil and dust removing device 2 can be a cyclone oil and dust removing device, a washing oil and dust removing device or a filtering oil and dust removing device, and preferably, the primary oil and dust removing device 2 adopts a filtering oil and dust removing device. The filtering oil-removing and dust-removing device can be of a wire mesh type, a packing type and a baffle type and comprises a filtering tank (serving as a closed container) and an inner member (a wire mesh, a packing, a baffle and the like filled in the filtering tank), wherein the filtering tank at least comprises an inlet and two outlets, the inlet of the filtering tank is connected with the outlet of a sampling valve V11 through a pipeline, one outlet of the filtering tank outputs coal gas after oil-removing and dust-removing, and the other outlet is used for periodically discharging removed tar, dust, water drops and the like.
The secondary oil and dust removing device 3 is used for further removing tar, solid particles, liquid drops and other impurity components which are easy to settle and condense and are contained in the coal gas. The second-stage oil and dust removing device 3 can be a cyclone oil and dust removing device, a washing oil and dust removing device or a filtering oil and dust removing device, and preferably, the second-stage oil and dust removing device 3 adopts a washing oil and dust removing device. The washing, oil removing and dust removing device comprises a washing tank (as a closed container) and washing liquid (contained in the washing tank), wherein the washing tank at least comprises an inlet and two outlets, and the inlet of the washing tank is connected with a coal gas outlet on a filter tank in the primary oil removing and dust removing device 2 through a pipeline. Preferably, the inlet of the washing tank is positioned below the washing liquid, and the coal gas entering the washing tank from the inlet is directly contacted with the washing liquid to be mixed so as to further absorb and remove tar, solid particles, liquid drops and the like. One outlet (positioned above the washing liquid) of the washing tank outputs the coal gas after oil and dust removal, and the other outlet is used for periodically discharging dirty washing liquid absorbing tar, dust, water drops and the like. The washing liquid can be chloroform, dimethylbenzene, sulfuric acid, washing oil and the like, and is generally selected according to the gas temperature and the boiling point of the washing liquid.
The desulfurization device 4 is used for removing sulfide such as H contained in the gas2S、SO2And the like. The desulfurization device 4 may be a scrubbing desulfurization device or an adsorption desulfurization device, and preferably, the desulfurization device 4 is a scrubbing desulfurization device. The washing and desulfurizing device comprises a washing tank (as a closed container) and washing liquid (contained in the washing tank), wherein the washing tank at least comprises an inlet and two outlets, the inlet of the washing tank is connected with a coal gas outlet on the washing tank in the secondary oil and dust removing device 3, preferably, the inlet of the washing tank in the desulfurizing device 4 is positioned below the washing liquid, the coal gas entering the washing tank from the inlet is directly contacted and mixed with the washing liquid, and sulfide in the coal gas is absorbed by the washing liquid. One outlet (located above the washing liquid) of the washing tank in the desulfurization device 4 outputs the gas after further desulfurization, and the other outlet is used for periodically discharging the dirty washing liquid absorbing sulfide. The washing liquid in the washing tank in the desulphurization device 4 can be zinc acetate, cadmium acetate, lead acetate, copper sulfate solution and the like, and the solution is generally required not to absorb carbon dioxide obviously while removing sulfide.
The dehumidifier 5 is used for removing liquid water (water drops, water mist) and gaseous water (water vapor) contained in the coal gas. The dehumidifying device 5 can be a cyclone centrifugal dehumidifying device, a condensation dehumidifying device, a solvent absorption dehumidifying device, an adsorption dehumidifying device and the like, preferably, the dehumidifying device 5 adopts the condensation dehumidifying device, and can cool coal gas while dehumidifying so that the temperature of the coal gas meets the sampling temperature required by the on-line analyzer. The condensation dehumidification device comprises a cooler (serving as a container for heat exchange between coal gas and refrigerant) and refrigerant (cooling the coal gas), preferably, the cooler is of a sleeve structure and comprises a tube pass and a shell pass, the tube pass comprises an inlet and an outlet which are connected with the tube pass, the shell pass comprises an inlet and an outlet which are connected with the shell pass, the coal gas led out from the desulfurization device 4 passes through the tube pass, and the refrigerant passes through the shell pass.
The method for the coal gas on-line analysis pretreatment device to carry out coal gas pretreatment comprises the following steps:
the sampling device 1 leads out the coal gas from the gas outlet drill hole or the coal gas pipeline and sends the coal gas into the primary oil and dust removing device 2, and the primary oil and dust removing device 2 filters the impurities which are easy to settle and condense, such as tar, solid particles, liquid drops and the like in the coal gas; the coal gas led out from the first-stage oil and dust removing device 2 is sent into a second-stage oil and dust removing device 3, and the second-stage oil and dust removing device 3 is used for washing and removing residual tar, solid particles, liquid drops and other impurities which are easy to settle and condense in the coal gas; the coal gas led out from the secondary oil and dust removing device 3 is sent into a desulphurization device 4, and the desulphurization device 4 washes and removes sulfides in the coal gas; the coal gas led out from the desulphurization device 4 is sent into a dehumidification device 5, and the dehumidification device 5 cools the coal gas and condenses and removes liquid water and gaseous water contained in the coal gas; the dehydrated coal gas can be sent to a coal gas on-line analyzer for detection.
Example two
On the basis of the structure of the first embodiment, the gas online analysis preprocessing device further comprises a steady flow pressure stabilizing device 6. The sampling device 1, the primary oil and dust removing device 2, the secondary oil and dust removing device 3, the desulfurizing device 4, the dehumidifying device 5 and the steady flow pressure stabilizing device 6 are sequentially connected through pipelines. When the gas is analyzed and detected on line, the steady flow and pressure stabilizing device 6 is connected with the gas on-line analyzer through a pipeline.
The steady flow pressure stabilizer 6 is used for stabilizing the pressure and the flow of the coal gas. This stationary flow pressure stabilizer 6 is the sampling pump, the sampling pump can be venturi pump, diaphragm pump, scraper pump, vacuum pump, piston pump etc..
The method for the coal gas on-line analysis pretreatment device to carry out coal gas pretreatment comprises the following steps:
the sampling device 1 leads out the coal gas from the gas outlet drill hole or the coal gas pipeline and sends the coal gas into the primary oil and dust removing device 2, and the primary oil and dust removing device 2 filters the impurities which are easy to settle and condense, such as tar, solid particles, liquid drops and the like in the coal gas; the coal gas led out from the first-stage oil and dust removing device 2 is sent into a second-stage oil and dust removing device 3, and the second-stage oil and dust removing device 3 is used for washing and removing residual tar, solid particles, liquid drops and other impurities which are easy to settle and condense in the coal gas; the coal gas led out from the secondary oil and dust removing device 3 is sent into a desulphurization device 4, and the desulphurization device 4 washes and removes sulfides in the coal gas; the coal gas led out from the desulphurization device 4 is sent into a dehumidification device 5, and the dehumidification device 5 cools the coal gas and condenses and removes liquid water and gaseous water contained in the coal gas; the dehydrated coal gas is sent into a steady flow pressure stabilizer 6 to keep the pressure and flow of the supplied gas stable; the coal gas led out from the steady flow pressure stabilizer 6 can be sent into a coal gas on-line analyzer for detection.
EXAMPLE III
On the basis of the structure of the second embodiment, the gas on-line analysis pretreatment device further comprises a drying device 7. The sampling device 1, the primary oil and dust removing device 2, the secondary oil and dust removing device 3, the desulfurizing device 4, the dehumidifying device 5, the drying device 7 and the steady flow pressure stabilizing device 6 are sequentially connected through pipelines. The drying device 7 is connected between the dehumidifying device 5 and the flow stabilizing and pressure stabilizing device 6.
When the gas is analyzed and detected on line, the steady flow and pressure stabilizing device 6 is connected with the gas on-line analyzer through a pipeline.
The drying device 7 may be a solvent absorption drying device, an adsorption drying device, or the like. Preferably, the drying device 7 is an adsorption drying device, and comprises a dryer (closed container) and a drying agent (contained in the dryer and used for adsorbing residual moisture in the coal gas). The dryer at least comprises an inlet and an outlet, the inlet of the dryer is connected with the coal gas outlet on the dehumidifying device 5 through a pipeline, and the outlet of the dryer outputs the further dehumidified coal gas to the flow stabilizing and pressure stabilizing device 6. The desiccant can be neutral desiccant such as silica gel, anhydrous copper sulfate, anhydrous calcium chloride, etc.
The method for the coal gas on-line analysis pretreatment device to carry out coal gas pretreatment comprises the following steps:
the sampling device 1 leads out the coal gas from the gas outlet drill hole or the coal gas pipeline and sends the coal gas into the primary oil and dust removing device 2, and the primary oil and dust removing device 2 filters the impurities which are easy to settle and condense, such as tar, solid particles, liquid drops and the like in the coal gas; the coal gas led out from the first-stage oil and dust removing device 2 is sent into a second-stage oil and dust removing device 3, and the second-stage oil and dust removing device 3 is used for washing and removing residual tar, solid particles, liquid drops and other impurities which are easy to settle and condense in the coal gas; the coal gas led out from the secondary oil and dust removing device 3 is sent into a desulphurization device 4, and the desulphurization device 4 washes and removes sulfides in the coal gas; the coal gas led out from the desulphurization device 4 is sent into a dehumidification device 5, and the dehumidification device 5 cools the coal gas and condenses and removes liquid water and gaseous water contained in the coal gas; the dehydrated coal gas is sent into a drying device 7, and the drying device 7 adsorbs and removes the residual water vapor in the coal gas; the coal gas led out from the drying device 7 is sent into a steady flow pressure stabilizer 6 to keep the pressure and the flow of the supplied gas stable; the coal gas led out from the steady flow pressure stabilizer 6 can be sent into a coal gas on-line analyzer for detection.
Example four
On the basis of the structure of the third embodiment, the gas on-line analysis pretreatment device also comprises a precise filtering device 8. The sampling device 1, the primary oil and dust removing device 2, the secondary oil and dust removing device 3, the desulfurizing device 4, the dehumidifying device 5, the drying device 7, the steady flow pressure stabilizing device 6 and the precise filtering device 8 are sequentially connected through pipelines.
When the gas is analyzed and detected on line, the precise filtering device 8 is connected with a gas on-line analyzer through a pipeline.
The precise filtering device 8 is used for further removing micro-particles, micro-liquid drops and the like in the coal gas. The precise filtering device 8 comprises a filtering tank (closed container) and a filter element. The filter tank at least comprises an inlet and an outlet, and the inlet of the filter tank in the precise filter device 8 is connected with a coal gas outlet on the flow stabilizing and pressure stabilizing device 6. The outlet of the filter tank in the precise filter device 8 outputs coal gas from which micro-particles and micro-droplets are further removed, and the filtered coal gas is sent to a coal gas on-line analyzer; the filter element in the precise filter device 8 can be an ultramicropore fiber filter element, an active carbon filter element, a ceramic filter element and the like.
The method for the coal gas on-line analysis pretreatment device to carry out coal gas pretreatment comprises the following steps:
the sampling device 1 leads out the coal gas from the gas outlet drill hole or the coal gas pipeline and sends the coal gas into the primary oil and dust removing device 2, and the primary oil and dust removing device 2 filters the impurities which are easy to settle and condense, such as tar, solid particles, liquid drops and the like in the coal gas; the coal gas led out from the first-stage oil and dust removing device 2 is sent into a second-stage oil and dust removing device 3, and the second-stage oil and dust removing device 3 is used for washing and removing residual tar, solid particles, liquid drops and other impurities which are easy to settle and condense in the coal gas; the coal gas led out from the secondary oil and dust removing device 3 is sent into a desulphurization device 4, and the desulphurization device 4 washes and removes sulfides in the coal gas; the coal gas led out from the desulphurization device 4 is sent into a dehumidification device 5, and the dehumidification device 5 cools the coal gas and condenses and removes liquid water and gaseous water contained in the coal gas; the dehydrated coal gas is sent into a drying device 7, and the drying device 7 adsorbs and removes the residual water vapor in the coal gas; the coal gas led out from the drying device 7 is sent into a steady flow pressure stabilizer 6 to keep the pressure and the flow of the supplied gas stable; the coal gas led out from the steady flow pressure stabilizer 6 is sent into a precise filtering device 8, and micro particles and micro liquid drops are further removed by the precise filtering device 8; the gas exiting the microfiltration device 8 can be sent to a gas on-line analyzer for detection.
EXAMPLE five
On the basis of the structure of the fourth embodiment, the gas on-line analysis pretreatment device further comprises a gas flow metering device 9. As shown in fig. 2, a sampling device 1, a primary oil and dust removing device 2, a secondary oil and dust removing device 3, a desulfurizing device 4, a dehumidifying device 5, a drying device 7, a steady flow pressure stabilizing device 6, a precise filtering device 8 and a gas flow metering device 9 are connected in sequence through pipelines.
When the gas is analyzed and detected on line, the gas flow metering device 9 is connected with a gas on-line analyzer through a pipeline.
The gas flow metering device 9 is used for metering gas flow. The gas metering device 9 comprises a gas emptying pipeline, a flow meter and a control valve, wherein the emptying pipeline is used for adjusting the flow of gas entering the gas on-line analyzer and emptying excessive gas to enable the flow to meet the sample injection flow required by the gas on-line analyzer. The emptying pipeline is arranged between the steady flow pressure stabilizer 6 and the precise filtering device 8, namely the emptying coal gas does not pass through the precise filtering device 8. A second flow meter 9b and a control valve are arranged between the fine filtering device 8 and the gas on-line analyzer, and preferably, a first flow meter 9a and a control valve are arranged on the emptying pipeline. The first flow meter 9a and the second flow meter 9b can be a rotor flow meter and a gas mass flow meter.
The method for the coal gas on-line analysis pretreatment device to carry out coal gas pretreatment comprises the following steps:
the sampling device 1 leads out the coal gas from the gas outlet drill hole or the coal gas pipeline and sends the coal gas into the primary oil and dust removing device 2, and the primary oil and dust removing device 2 filters the impurities which are easy to settle and condense, such as tar, solid particles, liquid drops and the like in the coal gas; the coal gas led out from the first-stage oil and dust removing device 2 is sent into a second-stage oil and dust removing device 3, and the second-stage oil and dust removing device 3 is used for washing and removing residual tar, solid particles, liquid drops and other impurities which are easy to settle and condense in the coal gas; the coal gas led out from the secondary oil and dust removing device 3 is sent into a desulphurization device 4, and the desulphurization device 4 washes and removes sulfides in the coal gas; the coal gas led out from the desulphurization device 4 is sent into a dehumidification device 5, and the dehumidification device 5 cools the coal gas and condenses and removes liquid water and gaseous water contained in the coal gas; the dehydrated coal gas is sent into a drying device 7, and the drying device 7 adsorbs and removes the residual water vapor in the coal gas; the coal gas led out from the drying device 7 is sent into a steady flow pressure stabilizer 6 to keep the pressure and the flow of the supplied gas stable; the coal gas led out from the steady flow pressure stabilizer 6 is sent into a precise filtering device 8, and micro particles and micro liquid drops are further removed by the precise filtering device 8; the coal gas led out from the precise filtering device 8 is sent to a coal gas flow metering device 9, the coal gas flow metering device 9 adjusts the coal gas flow entering the coal gas on-line analyzer by adjusting the coal gas flow of a vent pipeline, and excess coal gas is vented.
EXAMPLE six
On the basis of the structure of the fifth embodiment, the on-line gas analysis and pretreatment device further comprises a back-blowing device 10. As shown in fig. 2, the blowback device 10 is connected between the sampling device 1 and the first-stage oil and dust removing device 2, and is used for purging the sampling device 1 and the pipeline between the sampling device 1 and the first-stage oil and dust removing device 2.
The blowback device 10 includes blowback pipeline and control valve, the blowback pipeline sets up between sampling device 1 and one-level deoiling dust collector 2, can regularly sweep the pipeline between sampling device 1 and one-level deoiling dust collector 2, prevents to be blockked up by tar, dust. The medium for purging is steam and/or preheated nitrogen. In a further improvement, a second inlet is arranged on a filter tank in the primary oil and dust removing device 1, the second inlet is connected with a back flushing pipeline, the primary oil and dust removing device 2 can be periodically purged, tar, dust and the like adhered to the device are removed, and the tar, the dust and the like are discharged through a liquid phase outlet.
EXAMPLE seven
On the basis of the structure of the sixth embodiment, the gas online analysis pretreatment device further comprises a heat preservation device 11. As shown in fig. 2, the heat insulation device 11 includes heat tracing pipelines and heat tracing media, the heat tracing pipelines are laid on pipelines among the sampling device 1, the sampling device 1 and the primary oil and dust removing device 2, and other pipelines and devices needing heat tracing between the primary oil and dust removing device 2 and the dehumidifying device 5, so as to prevent the condensate from freezing in winter or prevent the tar precipitation fluidity from reducing and blocking the pipelines.
Example eight
On the basis of the structure of the sixth embodiment, as shown in fig. 3, the gas on-line analysis pretreatment device further includes a standby primary oil and dust removing device 2 ', a standby secondary oil and dust removing device 3', a standby desulfurization device 4 ', and a standby drying device 7'. The standby first-stage oil and dust removing device 2 ', the standby second-stage oil and dust removing device 3 ' and the standby desulphurization device 4 ' are connected in series and are arranged in parallel with the first-stage oil and dust removing device 2, the second-stage oil and dust removing device 3 and the desulphurization device 4 which are connected in series through pipelines. A standby drying means 7' is arranged in parallel with said drying means 7.
In addition, preferably, a spare blowback device 10 'is also arranged between the sampling device 1 and the spare primary oil and dust removing device 2'.
When the primary oil and dust removing device 2, the secondary oil and dust removing device 3, the desulfurizing device 4, the drying device 7 and the back flushing device 10 have faults, the standby devices can be switched, so that the long-term continuous and stable operation of the coal gas online analysis pretreatment device is ensured.
Example nine
On the basis of the structure of the eighth embodiment, as shown in fig. 4, the gas online analysis preprocessing device further includes a control device 12, and the control device 12 includes a controller, and an electromagnetic valve and a sensor electrically connected to the controller.
The controller is preferably a Programmable Logic Controller (PLC).
The solenoid valve includes:
the first electromagnetic valve V1 is connected between the sampling device 1 and the primary oil and dust removing device 2;
a second electromagnetic valve V2 connected between the desulfurizer 4 and the dehumidifier 5;
a third electromagnetic valve V3 connected between the dehumidifying apparatus 5 and the drying apparatus 7;
a fourth electromagnetic valve V4 connected between the drying device 7 and the steady flow and pressure stabilizing device 6;
a fifth electromagnetic valve V5, which is connected between the pipeline between the sampling device 1 and the primary oil and dust removing device 2 and the blowback device 10;
a sixth electromagnetic valve V6 connected between the blowback device 10 and the primary oil and dust removing device 2;
a seventh electromagnetic valve V7, which is connected between the primary oil and dust removing device 2 and the secondary oil and dust removing device 3;
an eighth electromagnetic valve V8 connected between the secondary oil and dust removing device 3 and the desulphurization device 4;
a ninth electromagnetic valve V9 connected between the steady flow stabilizer 6 and the precise filtering device 8;
and a tenth electromagnetic valve V10 connected behind the fine filtering device 8 and between the fine filtering device 8 and the gas flow metering device 9.
The sensor includes:
the pressure sensor S1 is arranged on a coal gas outlet of the primary oil and dust removing device 2;
a temperature sensor S2 provided on the gas outlet of the dehumidifying apparatus 5;
and a humidity sensor S3, which is arranged on the gas outlet of the precise filtering device 8.
In addition, preferably, a standby fifth electromagnetic valve V5 ', a standby sixth electromagnetic valve V6', a standby seventh electromagnetic valve V7 'and a standby eighth electromagnetic valve V8' corresponding to the fifth electromagnetic valve V5, the sixth electromagnetic valve V6, the seventh electromagnetic valve V7 and the eighth electromagnetic valve V8 are arranged between the standby first-stage oil-removing and dust-removing device 2 ', the standby second-stage oil-removing and dust-removing device 3', the standby desulfurization device 4 'and the standby blowback device 10'.
The controller in the control device 12 collects signals output by the sensors, and controls the opening and closing of each electromagnetic valve through a program, so as to realize the operations of automatic purging, automatic sample introduction, automatic switching of double sets of redundant backup, automatic discharge of condensate and the like.
The coal gas on-line analysis pretreatment device and the pretreatment method thereof provided by the embodiments adopt the multi-stage filtration, absorption and condensation processes to pretreat the coal gas, can quickly remove various impurities such as tar, dust and water of underground coal gas, provide a clean, constant-temperature and stable gas source for the analysis device, and have the advantages of convenient operation, high removal efficiency and thorough removal.
In addition, a double-set redundancy backup design is adopted, so that the continuous and stable operation of the pretreatment system is ensured; a back-blowing and heat-insulating device is designed at the sampling end, so that the blockage of a pipeline is avoided; furthermore, the process is automated by means of program control of the control device 12.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.
Claims (4)
1. The utility model provides a coal gas on-line analysis preprocessing device which characterized in that includes:
a sampling device for taking gas from the gas outlet bore or gas pipeline;
the primary oil and dust removing device is connected with the sampling device through a pipeline and is used for removing impurities which are easy to settle and condense in the coal gas from a gas phase;
the secondary oil and dust removing device is connected with the primary oil and dust removing device through a pipeline and is used for further removing impurities which are contained in the coal gas and are easy to settle and condense;
the desulfurization device is connected with the secondary oil and dust removal device through a pipeline and is used for removing sulfides contained in the coal gas;
the dehumidifying device is connected with the desulfurizing device through a pipeline and is used for removing liquid water and gaseous water contained in the coal gas;
the steady flow pressure stabilizer is connected with the dehumidifying device through a pipeline and is used for stabilizing the pressure and the flow of the coal gas;
a drying device for controlling the humidity of the coal gas is connected between the dehumidifying device and the flow stabilizing and pressure stabilizing device;
the precise filtering device is connected with the flow stabilizing and pressure stabilizing device through a pipeline and is used for removing micro-particles and micro-droplets in the coal gas;
the gas flow metering device is connected with the precise filtering device through a pipeline and is used for metering the gas flow;
and the back flushing device is connected between the sampling device and the primary oil and dust removing device and is used for purging the sampling device and pipelines between the sampling device and the primary oil and dust removing device.
2. The on-line gas analysis and pretreatment device of claim 1, further comprising:
and the heat preservation device is arranged on the pipeline and used for heating the pipeline.
3. The on-line gas analysis and pretreatment device of claim 2, further comprising:
the standby first-stage oil and dust removing device, the standby second-stage oil and dust removing device and the standby desulfurizing device are connected in series and are arranged in parallel with the first-stage oil and dust removing device, the second-stage oil and dust removing device and the desulfurizing device which are connected in series through pipelines;
a standby drying device disposed in parallel with the drying device.
4. The on-line gas analysis and pretreatment device as claimed in claim 3, further comprising a control device, wherein the control device comprises a controller, and an electromagnetic valve and a sensor which are electrically connected with the controller;
the solenoid valve includes:
the first electromagnetic valve is connected between the sampling device and the primary oil and dust removing device;
a second electromagnetic valve connected between the desulfurization device and the dehumidification device;
a third electromagnetic valve connected between the dehumidifying device and the drying device;
the fourth electromagnetic valve is connected between the drying device and the flow stabilizing and pressure stabilizing device;
the fifth electromagnetic valve is connected between the pipeline between the sampling device and the primary oil and dust removing device and the back flushing device;
the sixth electromagnetic valve is connected between the back flushing device and the primary oil and dust removing device;
the seventh electromagnetic valve is connected between the primary oil and dust removing device and the secondary oil and dust removing device;
the eighth electromagnetic valve is connected between the secondary oil and dust removing device and the desulfurization device;
the ninth electromagnetic valve is connected between the flow stabilizing and pressure stabilizing device and the precise filtering device;
a tenth solenoid valve connected after the microfiltration device;
the sensor includes:
the pressure sensor is arranged on a coal gas outlet of the primary oil and dust removing device;
the temperature sensor is arranged on a gas outlet of the dehumidification device;
and the humidity sensor is arranged on a gas outlet of the precise filtering device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201920656478.8U CN210180780U (en) | 2019-05-08 | 2019-05-08 | Coal gas on-line analysis preprocessing device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920656478.8U CN210180780U (en) | 2019-05-08 | 2019-05-08 | Coal gas on-line analysis preprocessing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006730A (en) * | 2019-05-08 | 2019-07-12 | 北京博锐新能科技有限公司 | A kind of coal gas on-line analysis pretreatment unit and its preprocess method |
| CN114235515A (en) * | 2022-01-27 | 2022-03-25 | 重庆钢铁股份有限公司 | Novel and safe converter gas sampling device and method |
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2019
- 2019-05-08 CN CN201920656478.8U patent/CN210180780U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110006730A (en) * | 2019-05-08 | 2019-07-12 | 北京博锐新能科技有限公司 | A kind of coal gas on-line analysis pretreatment unit and its preprocess method |
| CN114235515A (en) * | 2022-01-27 | 2022-03-25 | 重庆钢铁股份有限公司 | Novel and safe converter gas sampling device and method |
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