CN110857405B - Natural gas purification system and method for natural gas flow primary standard device - Google Patents
Natural gas purification system and method for natural gas flow primary standard device Download PDFInfo
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- CN110857405B CN110857405B CN201810967740.0A CN201810967740A CN110857405B CN 110857405 B CN110857405 B CN 110857405B CN 201810967740 A CN201810967740 A CN 201810967740A CN 110857405 B CN110857405 B CN 110857405B
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 424
- 239000003345 natural gas Substances 0.000 title claims abstract description 208
- 238000000746 purification Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000018044 dehydration Effects 0.000 claims abstract description 87
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 87
- 239000007787 solid Substances 0.000 claims abstract description 42
- 239000002245 particle Substances 0.000 claims abstract description 41
- 239000007789 gas Substances 0.000 claims abstract description 38
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 12
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 12
- 239000011593 sulfur Substances 0.000 claims abstract description 12
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000001179 sorption measurement Methods 0.000 claims description 42
- 230000007246 mechanism Effects 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000002808 molecular sieve Substances 0.000 claims description 17
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 17
- 230000001105 regulatory effect Effects 0.000 claims description 8
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 238000003795 desorption Methods 0.000 claims description 6
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 2
- 238000006477 desulfuration reaction Methods 0.000 abstract description 9
- 230000023556 desulfurization Effects 0.000 abstract description 9
- 238000013461 design Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
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- 230000007797 corrosion Effects 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
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- 239000011148 porous material Substances 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000003463 adsorbent Substances 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000012024 dehydrating agents Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
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- 229910002027 silica gel Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/103—Sulfur containing contaminants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/106—Removal of contaminants of water
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Drying Of Gases (AREA)
Abstract
The invention discloses a natural gas purification system and a method for a natural gas flow primary standard device, wherein the system comprises a desulfurization tank, a buffer tank, a dehydration device and a filter which are sequentially communicated through a pipeline; the desulfurizing tank is communicated with a gas source of a natural gas flow primary standard device and is used for removing sulfur in natural gas; the dehydration device is used for enabling the natural gas to pass through from top to bottom so as to adsorb moisture in the natural gas; the filter is used for removing solid particles in the natural gas and conveying a part of the natural gas to a standard flowmeter of a natural gas flow primary standard device; the natural gas purification system comprises a heater arranged between the filter and the dehydration device and a condenser communicated with the dehydration device; the heater is used for heating the other part of the natural gas to a first preset temperature and enabling the natural gas to pass through the dehydration device from bottom to top so as to analyze the moisture absorbed by the dehydration device; the condenser is used for cooling the moisture generated when the dehydrating device analyzes.
Description
Technical Field
The invention relates to the field of gas flow detection, in particular to a natural gas purification system and method for a natural gas flow primary standard device.
Background
The gas flow standard device is a system established for determining a gas flow standard quantity value, the function of the gas flow standard device is to transmit an accurate and uniform gas flow quantity value to a flow meter for natural gas trade metering, and the establishment of the gas flow standard device is of great significance for ensuring the accuracy, reliability and fairness of the natural gas trade metering.
The prior art provides a primary standard device of gas flow, and the device includes: the air source, the standard flowmeter and the weighing device are communicated in sequence. When the device is used, natural gas in a gas source flows into the weighing device through the gas flowmeter. And measuring the air inflation time and the mass change of the weighing device before and after air inflation, and calculating the flow rate of the natural gas flowing into the weighing device. The standard flow meter is then calibrated based on the natural gas flow rate. And finally, communicating the calibrated standard flowmeter with a downstream flow meter for natural gas trade metering, and calibrating the flow meter.
The inventor finds that the prior art has at least the following problems:
if the detected natural gas contains sulfur or moisture, a lot of adverse factors are brought to the flow measurement of the natural gas, for example, when the temperature is reduced or the pressure is increased, saturated water in the natural gas can be separated out in a liquid phase, so that accumulated liquid is generated in the natural gas flow primary standard device, the flow pressure drop is increased, even slug flow is formed, and the corrosion of acidic components in the natural gas to the natural gas flow primary standard device is accelerated; liquid water can freeze at the freezing point, and even when the temperature of natural gas is higher than the freezing point, the liquid water can form ice and snow-like solid hydrate with certain gas components in the natural gas, can block valves, pipelines and equipment of the natural gas flow primary standard device in serious conditions, influences the normal operation of the natural gas flow primary standard device, and increases the uncertainty of natural gas flow measurement.
Disclosure of Invention
The embodiment of the invention provides a natural gas purification system and a natural gas purification method for primary standard of natural gas flow, which can solve the problems. The technical scheme is as follows:
in one aspect, there is provided a natural gas purification system for a natural gas flow primary standard, the natural gas purification system comprising: the desulfurization tank, the buffer tank, the dehydration device and the filter are communicated in sequence through pipelines;
the desulfurizing tank is communicated with a gas source of the natural gas flow primary standard device and is used for removing sulfur in the natural gas;
the dehydration device is used for enabling the desulfurized natural gas to pass through from top to bottom so as to adsorb moisture in the desulfurized natural gas;
the filter is used for removing solid particles in the dehydrated natural gas and conveying a part of the natural gas with the removed solid particles to a standard flowmeter of a natural gas flow primary standard device;
the natural gas purification system further comprises: the heater is arranged between the filter and the dehydration device, and the condenser is communicated with the dehydration device;
the heater is used for heating the other part of the natural gas without the solid particles to a first preset temperature, and enabling the heated natural gas to pass through the dehydration device from bottom to top so as to analyze the moisture adsorbed by the dehydration device;
the condenser is used for cooling the moisture generated during the analysis of the dehydration device so as to separate the other part of the natural gas from which the solid particles are removed.
In one possible design, the devulcanizer includes: the desulfurizer bed layer is arranged in the shell;
be provided with open-top and bottom opening on the casing, open-top with low pressure air supply storage tank or booster mechanism intercommunication, the bottom opening with the buffer tank intercommunication.
In one possible design, the desulfurizer bed is a zinc oxide bed.
In a possible design, a conveying pipeline is further disposed between the bottom opening and the heater, and is used for conveying a part of the desulfurized natural gas into the heater to resolve moisture adsorbed by the dehydration device.
In one possible embodiment, the dewatering device comprises: a plurality of adsorption columns;
the top opening of the adsorption tower is respectively communicated with the buffer tank and the condenser, and the bottom opening of the adsorption tower is respectively communicated with the heater and the filter;
and reversing valves are arranged on the top opening and the bottom opening of the adsorption tower.
In one possible embodiment, the adsorption column is a molecular sieve adsorption column.
In a possible design, the heater is further configured to heat the remaining part of the natural gas from which the solid particles are removed to a second preset temperature, and allow the heated natural gas to pass through the dehydration device from bottom to top, so as to cool the dehydration device after moisture desorption.
In one possible embodiment, the gas source comprises: the low-pressure air source storage tank, the supercharging mechanism, the high-pressure air source storage tank and the pressure regulating mechanism are communicated in sequence;
the pressure regulating mechanism is communicated with the standard flowmeter;
the natural gas purification system is arranged between the low-pressure gas source storage tank and the pressurization mechanism or between the pressurization mechanism and the high-pressure gas source storage tank.
In another aspect, there is provided a natural gas purification method for a natural gas flow primary standard apparatus, the natural gas purification method comprising:
removing sulfur from natural gas in a gas source of a natural gas flow primary standard device by using a desulfurizing tank;
conveying the desulfurized natural gas into a buffer tank, and enabling the desulfurized natural gas to pass through a dehydration device from top to bottom so as to adsorb moisture in the desulfurized natural gas;
removing solid particles in the dehydrated natural gas by using a filter, and conveying a part of natural gas from which the solid particles are removed to a standard flowmeter of the natural gas flow primary standard device;
heating the other part of the natural gas with the solid particles removed to a first preset temperature by using a heater, and enabling the heated natural gas to pass through the dehydration device from bottom to top so as to analyze the moisture adsorbed by the dehydration device;
and cooling the water generated during the analysis by the dehydration device by using a condenser to separate the other part of the natural gas from which the solid particles are removed.
In a possible design, the first preset temperature is 200 ℃ to 350 ℃.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the natural gas purification system for the natural gas flow primary standard device, provided by the embodiment of the invention, through the matching of the desulfurization tank, the buffer tank, the dehydration device and the filter, sulfur, moisture and solid particles in the gas to be detected can be effectively removed, the corrosion of acidic components in the natural gas to the natural gas flow primary standard device can be slowed down, the normal operation of the natural gas flow primary standard device can be ensured, and the flow measurement precision of the natural gas can be improved; the heater is used for heating the other part of the natural gas without the solid particles, so that the water absorbed by the dehydration device can be analyzed, the dehydration effect of the dehydration device on the natural gas without the solid particles in the next round can be further improved, and the service life of the dehydration device can be prolonged; in addition, the water generated during the analysis of the dehydration device is cooled by the condenser, and the natural gas with the solid particles removed from the other part carried by the water can be separated, so that the economic benefit of the natural gas purification system is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a purification system for a primary standard natural gas flow plant according to an embodiment of the present invention.
Wherein the various reference numbers in the drawings are described below:
1-a devulcanizer;
2-a buffer tank;
3-a dewatering device;
4-a filter;
5-a heater;
6-a condenser;
7-conveying pipeline.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
An embodiment of the present invention provides a natural gas purification system for a natural gas flow primary standard device, as shown in fig. 1, the natural gas purification system includes: a desulfurizing tank 1, a buffer tank 2, a dewatering device 3 and a filter 4 which are communicated in sequence through pipelines; the desulfurizing tank 1 is communicated with a gas source of a natural gas flow primary standard device and is used for removing sulfur in natural gas; the dehydration device 3 is used for enabling the desulfurized natural gas to pass through from top to bottom so as to adsorb moisture in the desulfurized natural gas; the filter 4 is used for removing solid particles in the dehydrated natural gas and conveying a part of the natural gas with the removed solid particles to a standard flowmeter of a natural gas flow primary standard device. Further, the natural gas purification system further comprises: a heater 5 provided between the filter 4 and the dehydration device 3, and a condenser 6 communicating with the dehydration device 3; the heater 5 is used for heating the other part of the natural gas from which the solid particles are removed to a first preset temperature, and enabling the heated natural gas to pass through the dehydration device 3 from bottom to top so as to analyze the moisture absorbed by the dehydration device 3; the condenser 6 is used for cooling the moisture generated during the desorption of the dehydration device 3 to separate another part of the natural gas from which the solid particles are removed.
The following description is based on the working principle of the natural gas purification system for the primary standard natural gas flow device provided by the embodiment of the invention:
when the natural gas purification device is applied, the natural gas purification system is arranged between a gas source of the natural gas flow primary standard device and the standard flowmeter. The natural gas to be detected flows out of a gas source of the natural gas flow primary standard device and flows into the desulfurizing tank 1 to remove sulfur in the natural gas, and the desulfurized natural gas flows into the buffer tank 2 to be stored. Then, the desulfurized natural gas passes through the dehydration device 3 from top to bottom, so that the dehydration device 3 adsorbs moisture in the desulfurized natural gas. The dehydrated natural gas then flows into the filter 4 to remove solid particles from the dehydrated natural gas, such as the dehydrating agent in the dehydrating unit 3. Wherein, a part of natural gas from which solid particles are removed flows into a standard flowmeter of a natural gas flow primary standard device; the other part of the natural gas from which the solid particles are removed flows into the heater 5 to be heated to a first preset temperature (for example, 200 ℃ to 350 ℃), and the heated natural gas passes through the dehydration device 3 from bottom to top to resolve the moisture adsorbed by the dehydration device 3, that is, the heated natural gas is used for changing the moisture adsorbed by the dehydration device 3 into steam, and the steam is mixed with the heated natural gas. Then, the steam and the heated natural gas flow into the condenser 6, and the steam (i.e., moisture generated when the dehydration device 3 analyzes) is cooled by the condenser 6 to condense the steam into liquid water, thereby separating the steam and the heated natural gas. Wherein, the condensed steam can be discharged to a sewage pipe, and the heated natural gas can be discharged to a low-pressure pipe network.
Therefore, the natural gas purification system for the natural gas flow primary standard device provided by the embodiment of the invention can effectively remove sulfur, moisture and solid particles in the gas to be detected through the matching of the desulfurization tank 1, the buffer tank 2, the dehydration device 3 and the filter 4, can slow down the corrosion of acidic components in the natural gas to the natural gas flow primary standard device, can ensure the normal operation of the natural gas flow primary standard device, and can improve the flow measurement accuracy of the natural gas; the heater 5 is used for heating the other part of the natural gas without the solid particles, so that the water absorbed by the dehydration device 3 can be analyzed, the dehydration effect of the dehydration device 3 on the natural gas without the solid particles in the next round can be further improved, and the service life of the dehydration device 3 can be prolonged; in addition, the condenser 6 cools the moisture generated during the analysis of the dehydration device 3, and the natural gas with the solid particles removed from the other part carried by the moisture can be separated, so that the economic benefit of the natural gas purification system is improved.
On the premise of simple structure, in the embodiment of the present invention, the desulfurization tank 1 includes: the desulfurizer bed layer is arranged in the shell; be provided with open-top and bottom opening on the casing, open-top and low-pressure gas source storage tank or booster mechanism intercommunication, bottom opening and buffer tank 2 intercommunication.
It is understood that the desulfurized natural gas can enter the desulfurization tank 1 through the top opening of the shell and flow out through the bottom opening of the shell; similarly, the heated natural gas enters the desulfurization tank 1 through the bottom opening of the casing and flows out through the top opening of the casing.
The desulfurizer bed layer is a zinc oxide bed layer, and by the arrangement, sulfur in the natural gas to be detected can be effectively removed, and the operation cost of the natural gas purification system can be reduced.
In one possible embodiment, as shown in fig. 1, a transfer pipe 7 is further provided between the bottom opening and the heater 5 for transferring a part of the desulfurized natural gas into the heater 5 to resolve the moisture adsorbed by the dehydration device 3.
Through the arrangement, the problem that the natural gas flow passing through the heater 5 after removing the solid particles is too small due to the blockage of the pipeline between the heater 5 and the filter 4, and further the water adsorbed by the dehydration device 3 cannot be effectively analyzed can be avoided.
In order to analyze the dehydration device 3 without affecting the adsorption of the moisture in the desulfurized natural gas, in the embodiment of the present invention, the dehydration device 3 includes: a plurality of adsorption columns; the top opening of the adsorption tower is respectively communicated with the buffer tank 2 and the condenser 6, and the bottom opening is respectively communicated with the heater 5 and the filter 4; and reversing valves are arranged on the top opening and the bottom opening of the adsorption tower.
It can be understood that the above-mentioned reversing valve can control the fluid flow direction in the adsorption tower, and can make the desulfurized natural gas pass through the adsorption tower from top to bottom, or make the heated natural gas pass through the adsorption tower from bottom to top. And the working states of a part of the adsorption towers are opposite to the working states of the rest of the adsorption towers, namely, the part of the adsorption towers are in an adsorption state and the rest of the adsorption towers are in an analysis state by controlling respective reversing valves; after the preset time, a part of the absorption towers are adjusted from the adsorption state to the analysis state, and the rest of the absorption towers are adjusted from the analysis state to the adsorption state.
The number of adsorption towers may be set to 2 to 4, for example, 2, 3, or 4, and this arrangement makes it possible to efficiently adsorb moisture in the desulfurized natural gas while analyzing the dehydration device 3, and also makes it easy to control the flow direction of the fluid in each adsorption tower in the dehydration device 3.
In addition, the adsorption tower may be a molecular sieve adsorption tower, specifically, the molecular sieve of the adsorption tower may be a 4A type molecular sieve, and the molecular sieve may be obtained by a purchase method, for example, by the chang mountain chemical material science and technology limited company.
The molecular sieve adsorption tower has strong adsorption selectivity, and specifically, because the molecular sieve has uniform pore diameter, only molecules smaller than the pore diameter can be absorbed into the cavity in the crystal, and molecules larger than the pore diameter are screened out. In addition, the molecular sieve is an ionic adsorbent and can selectively adsorb according to different polarities of molecules, and water is a strong polar molecule, so that the molecular sieve can adsorb water and reduce or even eliminate the co-adsorption effect on other substance molecules. Moreover, the molecular sieve has higher adsorption capacity: for gases with high water content, the moisture compatibility of the molecular sieve is not higher than that of activated alumina and silica gel; however, when the relative humidity is less than 30% or less, the wet compatibility of the molecular sieve is relatively higher. Moreover, the molecular sieve can selectively adsorb water molecules, so that the adsorbent can be prevented from losing efficacy due to heavy hydrocarbon co-adsorption, and the service life of the molecular sieve can be prolonged. In addition, this type of molecular sieve is not easily destroyed by liquid water.
In order to avoid that the temperature of the desorbed dehydration device 3 is too high to effectively adsorb the moisture in the desulfurized natural gas of the next round, in the embodiment of the present invention, the heater 5 is further configured to heat the natural gas with the solid particles removed from the remaining part to the second preset temperature, and to make the heated natural gas pass through the dehydration device 3 from bottom to top to cool the dehydration device 3 after desorption of the moisture.
The natural gas treated by the filter 4 after removing moisture is divided into three parts, one part is delivered to the pressurization mechanism or the high-pressure gas source storage tank, the other part is delivered to the heater 5 until the natural gas is heated to the first preset temperature, and the rest part is delivered to the heater 5 until the natural gas is heated to the second preset temperature.
The second predetermined temperature may be less than or equal to 20 ℃, for example, 20 ℃, 18 ℃, 16 ℃, 14 ℃, 12 ℃, 10 ℃ and the like may be set. By the above arrangement, the temperature of the dehydration device 3 after the analysis can be effectively reduced.
In addition, the heater 5 can be arranged as a tubular heat exchanger, and the heater 5 is convenient to obtain and low in price. Specifically, the natural gas from which the solid particles are removed passes through the shell side of the tubular heat exchanger, and the heat source passes through the tube side of the tubular heater 5.
In order to effectively analyze the heated natural gas in the dehydration device 3 and effectively cool the analyzed dehydration device 3, a temperature sensor and a display electrically connected with the temperature sensor are arranged on a pipeline between the dehydration device 3 and the heater 5 in the embodiment of the invention; the temperature sensor is used for acquiring the temperature information of the heated natural gas and transmitting the temperature information to the display; the display is used for displaying temperature information. By the above arrangement, the temperature of the heated natural gas entering the dehydration device 3 can be effectively adjusted.
In order to further enable the heated natural gas to effectively analyze the dehydration device 3 and effectively cool the dehydration device 3 after analysis, the natural gas purification device is providedIn the embodiment of the invention, a flow meter is further arranged on a pipeline between the dehydration device 3 and the heater 5 and used for measuring the flow rate of the heated natural gas flowing into the dehydration device 3. Wherein the flow rate of the heated natural gas can be controlled to 500Nm3/h～700Nm3H, preferably 600Nm3H is used as the reference value. The flowmeter can be an orifice plate flowmeter, and the natural gas flow measured by the flowmeter can be uploaded to the flow indicator, so that an operator can observe whether the flow of the regenerated gas is in a proper range.
In the embodiment of the invention, the related pipelines are provided with valves so as to ensure the safety of operation.
After the natural gas to be detected is treated by the natural gas purification system provided by the embodiment of the invention, H2S content less than 5.7mg/m3(even not higher than 4 mg/m)3) And the water dew point can be below-60 ℃ (even below-65 ℃).
In an embodiment of the present invention, the gas source comprises: the low-pressure air source storage tank, the supercharging mechanism, the high-pressure air source storage tank and the pressure regulating mechanism are communicated in sequence; the pressure regulating mechanism is communicated with the standard flowmeter; the natural gas purification system is arranged between the low-pressure gas source storage tank and the pressurization mechanism or between the pressurization mechanism and the high-pressure gas source storage tank.
It should be noted that, when the desulfurization tank 1 is communicated with the low-pressure gas source storage tank, the filter 4 is communicated with the pressurization mechanism; and when the desulfurization tank 1 is communicated with the pressurization mechanism, the filter 4 is communicated with the high-pressure air source storage tank.
Through setting up as above, utilize booster mechanism to increase the pressure of natural gas to be greater than the operating pressure with standard flowmeter looks adaptation to and through the stable natural gas of high-pressure gas source storage tank conveying pressure in to pressure regulating mechanism, pressure is greater than the operational environment atmospheric pressure of standard flowmeter when actual detection promptly, and through the same natural gas of operational environment atmospheric pressure of pressure and standard flowmeter when actual detection to conveying pressure through pressure regulating mechanism, can guarantee that the calibration pressure of standard flowmeter does not receive the restriction of natural gas pressure, improve application scope.
In another aspect, an embodiment of the present invention further provides a natural gas purification method for a natural gas flow primary standard device, where the natural gas purification method includes:
removing sulfur from natural gas in a low-pressure gas source storage tank or a pressurization mechanism of a natural gas flow primary standard device by using a desulfurizing tank 1;
conveying the desulfurized natural gas into the buffer tank 2, and enabling the desulfurized natural gas to pass through the dehydration device 3 from top to bottom so as to adsorb moisture in the desulfurized natural gas;
removing solid particles in the dehydrated natural gas by using a filter 4, and conveying a part of the natural gas from which the solid particles are removed to a pressurization mechanism or a high-pressure gas source storage tank of a natural gas flow primary standard device;
heating the other part of the natural gas with the solid particles removed to a first preset temperature by using a heater 5, and enabling the heated natural gas to pass through the dehydration device 3 from bottom to top so as to analyze the moisture adsorbed by the dehydration device 3;
the water generated during the desorption in the dehydration unit 3 is cooled by the condenser 6 to separate another part of the natural gas from which the solid particles are removed.
The gas purification system for the natural gas flow primary standard device provided by the embodiment of the invention can slow down the corrosion of acid components in natural gas to the natural gas flow primary standard device, can ensure the normal operation of the natural gas flow primary standard device, can improve the flow measurement precision of natural gas, can prolong the service life of the dehydration device 3, and can improve the economic benefit of the natural gas purification system.
The first predetermined temperature is 200 to 350 ℃, for example, 200 ℃, 250 ℃, 300 ℃, 350 ℃ or the like, in order to effectively analyze the dehydration device 3.
In addition, based on the setting of the first preset temperature, in order to perform effective analysis on the dehydration apparatus 3, the analysis time of the dehydration apparatus 3 may be set to 2h to 6h, for example, specifically, 2h, 3h, 4h, 5h, 6h, and the like.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only an illustrative embodiment of the present invention, and should not be taken as limiting the scope of the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A natural gas purification system for a natural gas flow primary standard, the natural gas purification system comprising: a desulfurizing tank (1), a buffer tank (2), a dewatering device (3) and a filter (4) which are communicated in sequence through pipelines;
the desulfurizing tank (1) is communicated with a gas source of the natural gas primary standard device and is used for removing sulfur in natural gas, and the desulfurizing tank (1) comprises: the desulfurizer bed layer is arranged in the shell;
the shell is provided with a top opening and a bottom opening, the top opening is communicated with a low-pressure air source storage tank or a pressurization mechanism, and the bottom opening is communicated with the buffer tank (2);
the dehydration device (3) is used for enabling the desulfurized natural gas to pass through from top to bottom so as to adsorb moisture in the desulfurized natural gas;
the filter (4) is used for removing solid particles in the dehydrated natural gas and conveying a part of the natural gas with the removed solid particles to a standard flowmeter of the natural gas flow primary standard device;
the natural gas purification system further comprises: the device comprises a heater (5) arranged between the filter (4) and the dehydration device (3) and a condenser (6) communicated with the dehydration device (3), wherein a temperature sensor and a display connected with the temperature sensor are arranged on a pipeline between the dehydration device (3) and the heater (5);
the heater (5) is used for heating the other part of the natural gas without the solid particles to a first preset temperature, and enabling the heated natural gas to pass through the dehydration device (3) from bottom to top so as to analyze the moisture absorbed by the dehydration device (3);
the condenser (6) is used for cooling the moisture generated during the analysis of the dehydration device (3) so as to separate the other part of the natural gas with the solid particles removed;
the dehydration device (3) comprises: a plurality of adsorption towers, wherein the adsorption towers are molecular sieve adsorption towers;
the top opening of the adsorption tower is respectively communicated with the buffer tank (2) and the condenser (6), and the bottom opening of the adsorption tower is respectively communicated with the heater (5) and the filter (4);
and reversing valves are arranged on the top opening and the bottom opening of the adsorption tower.
2. The natural gas purification system of claim 1, wherein the desulfurizer bed is a zinc oxide bed.
3. Natural gas purification system according to claim 1, wherein a transfer pipe (7) is further arranged between the bottom opening and the heater (5) for transferring a portion of the desulfurized natural gas into the heater (5) for desorption of moisture adsorbed by the dehydration means (3).
4. The natural gas purification system according to claim 1, wherein the heater (5) is further configured to heat the remaining part of the natural gas from which the solid particles are removed to a second preset temperature, and to pass the heated natural gas through the dehydration device (3) from bottom to top to cool the dehydration device (3) after desorption of moisture.
5. A natural gas purification system according to any one of claims 1 to 4, wherein the gas source comprises: the low-pressure air source storage tank, the supercharging mechanism, the high-pressure air source storage tank and the pressure regulating mechanism are communicated in sequence;
the pressure regulating mechanism is communicated with the standard flowmeter;
the natural gas purification system is arranged between the low-pressure gas source storage tank and the pressurization mechanism or between the pressurization mechanism and the high-pressure gas source storage tank.
6. A natural gas purification method for a natural gas flow primary standard device, the natural gas purification method comprising:
removing sulfur from natural gas from a source of gas from a primary standard natural gas flow plant using a devulcanizer tank (1), the devulcanizer tank (1) comprising: the desulfurizer bed layer is arranged in the shell;
the shell is provided with a top opening and a bottom opening, the top opening is communicated with a low-pressure air source storage tank or a pressurization mechanism, and the bottom opening is communicated with the buffer tank (2);
conveying the desulfurized natural gas into a buffer tank (2), and enabling the desulfurized natural gas to pass through a dehydration device (3) from top to bottom so as to adsorb moisture in the desulfurized natural gas;
removing solid particles in the dehydrated natural gas by using a filter (4), and conveying a part of the natural gas with the removed solid particles to a standard flowmeter of the natural gas flow primary standard device;
heating the other part of the natural gas with the solid particles removed to a first preset temperature by using a heater (5), and enabling the heated natural gas to pass through the dehydration device (3) from bottom to top so as to analyze the moisture adsorbed by the dehydration device (3), wherein a pipeline between the dehydration device (3) and the heater (5) is provided with a temperature sensor and a display connected with the temperature sensor;
cooling, by a condenser (6), the water produced during analysis by the dehydration device (3) to separate another portion of the natural gas from which the solid particles have been removed;
the dehydration device (3) comprises a plurality of adsorption towers; the top opening of the adsorption tower is respectively communicated with the buffer tank (2) and the condenser (6), and the bottom opening of the adsorption tower is respectively communicated with the heater (5) and the filter (4); and the top opening and the bottom opening of the adsorption tower are both provided with reversing valves, and the adsorption tower is a molecular sieve adsorption tower.
7. The natural gas purification method according to claim 6, wherein the first predetermined temperature is 200 ℃ to 350 ℃.
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