CN113637509A - Method and device for dechlorinating natural gas - Google Patents
Method and device for dechlorinating natural gas Download PDFInfo
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- CN113637509A CN113637509A CN202110988735.XA CN202110988735A CN113637509A CN 113637509 A CN113637509 A CN 113637509A CN 202110988735 A CN202110988735 A CN 202110988735A CN 113637509 A CN113637509 A CN 113637509A
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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
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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
- C10L3/106—Removal of contaminants of water
Abstract
The disclosure relates to a natural gas dechlorination method and a natural gas dechlorination device, and provides a natural gas dechlorination method which comprises the following steps: (i) inertial separation distribution: carrying out inertia separation distribution on the mined natural gas, wherein a part of chlorine-containing liquid drops are separated out, and the rest natural gas is uniformly distributed and ascends; (ii) atomizing, spraying and washing: (ii) performing atomized spraying on the ascending natural gas obtained in the step (i) to capture chlorine-containing liquid drops in the natural gas, wherein the diameter of water mist particles of the atomized spraying is 50-1500 microns; and (iii) gas-liquid separation: and (ii) carrying out gas-liquid separation on the natural gas obtained in the step (ii) to finally obtain the dechlorinated natural gas. Also provides a natural gas dechlorination device.
Description
Technical Field
The disclosure belongs to the field of environmental energy, and relates to a natural gas dechlorination method and a natural gas dechlorination device. Specifically, the disclosure provides a method and a device for dechlorination through natural gas atomization, spraying, washing and drying.
Background
Natural gas is trapped in underground porous rock formations, including oil field gas, gas field gas, coal bed gas, mud volcanic gas, biogenic gas, and the like, and a small amount of natural gas is also released from the coal bed. It is a high-quality fuel and chemical raw material. The natural gas is mainly used as fuel and can be used for producing carbon black, chemicals and liquefied petroleum gas, and propane and butane produced by the natural gas are important raw materials in modern industry. Natural gas is composed mainly of gaseous low molecular hydrocarbons mixed with non-hydrocarbon gases. Because the substances which can affect the health of the respiratory system of human beings and are generated in the combustion process of natural gas are very few, the generated carbon dioxide is only about 40 percent of that of coal, the generated sulfur dioxide is also very little, and no waste residue or waste water is generated after combustion, compared with energy sources such as coal, petroleum and the like, the natural gas combustion method has the advantages of safe use, high heat value, cleanness and the like and is favored by people.
The gas field exploitation enters the middle and later stages, along with the pressure reduction of the gas reservoir, formation water gradually invades the gas reservoir, flows to the gas well, flows to the ground along with natural gas, namely, water is produced from the gas field, the gas well produced water has high chloride ion content and high mineralization degree, and also contains oil, so that the corrosion problem can be caused to a production device and stainless steel pipes in the exploitation process, chloride ions have the characteristics of small ionic radius, strong penetrating power and strong adsorption by the metal surface, the possibility of forming a passivation film on the surface of the metal material can be reduced, or the damage of the passivation film can be accelerated, and the gas field exploitation becomes a killer threatening the safety production.
In the prior art, natural gas dechlorination can be captured by mechanical means, washed with water or a process using chemical dechlorinating agents.
Patent application CN 110218579A discloses a method for dechlorinating hydrogenation reaction effluent in the fields of petroleum refining and chemical industry, raw oil and mixed hydrogen enter a hydrogenation reactor from the upper part after being heated by a reaction effluent and a reaction feeding heating furnace, and the reaction effluent enters a thermal high-pressure separator for gas-liquid separation after being heated by a reaction feeding heat exchanger; the hot high-pressure gas is sequentially heated by a hot high-pressure gas heat exchanger, cooled by a hot high-pressure gas air cooler and then enters a cold high-pressure separator for oil-gas-water three-phase separation; the hot high-molecular oil is decompressed by a regulating valve and then enters a hot low-pressure separator for gas-liquid separation; the method is characterized in that: a water injection point is arranged on the hot high-pressure gas distribution pipeline and is arranged at the inlet of the hot high-pressure gas distribution heat exchanger and the inlet of the hot high-pressure gas distribution air cooler; meanwhile, a water injection point is arranged behind the thermal high-pressure oil separation regulating valve; by adopting the method, under the condition that the investment of the device is not increased much, hydrogen chloride in the effluent of the hydrogenation reaction is removed by continuously injecting water in front of the high-pressure air cooler and the high-pressure air cooler.
Patent CN 208949217U discloses a dewatering device in high sulfur-containing gas field, designs dehydration step-down transformer, adds the dehydration spiral pipe in the dehydration barrel, installs the gas reflux pipe outside the barrel, and natural gas realizes the natural gas two-stage dehydration through barrel preliminary dehydration, throttle step-down, molecular sieve absorption, makes chlorine, sulfur-containing liquid drop and natural gas separation.
Patent CN104774654B discloses a method for using a blast furnace gas dechlorinating agent, which uses industrial limestone, commercial sodium carbonate and potassium hydroxide as main raw materials, optimizes the proportion and preparation process, carries out pelletizing by means of a disc pelletizer, and removes hydrogen chloride gas through a fixed bed reactor.
However, the above patents or patent applications, on the one hand, require the use of large amounts of water, increasing the costs and the volume of the equipment; on the other hand, a chemical agent is needed, so that certain pollution is caused to the environment; in addition, if a mechanical device is added for collection, dechlorination efficiency is difficult to guarantee.
Accordingly, there is a strong need in the art for a process and apparatus for dechlorinating natural gas that overcomes the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The present disclosure provides a novel natural gas dechlorination method and apparatus, which uses water to perform atomization spray washing to capture chlorine-containing liquid drops in natural gas, thereby overcoming the defects in the prior art.
In one aspect, the present disclosure provides a process for dechlorinating natural gas, the process comprising the steps of:
(i) inertial separation distribution: carrying out inertia separation distribution on the mined natural gas, wherein a part of chlorine-containing liquid drops are separated out, and the rest natural gas is uniformly distributed and ascends;
(ii) atomizing, spraying and washing: (ii) performing atomized spraying on the ascending natural gas obtained in the step (i) to capture chlorine-containing liquid drops in the natural gas, wherein the diameter of water mist particles of the atomized spraying is 50-1500 microns; and
(iii) gas-liquid separation: and (ii) carrying out gas-liquid separation on the natural gas obtained in the step (ii) to finally obtain the dechlorinated natural gas.
In a preferred embodiment, in step (i), the natural gas comprises seafloor directly mined natural gas and seafloor directly mined natural gas; the gas velocity of the gas rising after the gas is subjected to inertial separation distribution by the inertial separation distributor is controlled to be 0.1-5 m/s.
In another preferred embodiment, in step (ii), the small particle droplets sprayed by atomization are captured under collision, Brownian diffusion interception and thermophoresis mechanisms, and the ratio of the water amount/air amount of the atomized spray is between 1/15 and 1/3, wherein the unit of the water amount is L/h, and the unit of the air amount is m3/h。
In another preferred embodiment, in step (iii), gas-liquid separation is carried out by a baffled demister, and further gas-liquid separation is carried out by introducing into a single or a plurality of cyclone separators connected in parallel, and finally, clean gas with the chlorine content of not higher than 50ppm is collected.
In another preferred embodiment, the method further comprises: and introducing the wastewater dissolved with high-concentration chloride ions and collected after gas-liquid separation into a flash tank for separation, and obtaining clean water after separation for circulating defogging spraying washing.
In another aspect, the present disclosure provides an apparatus for dechlorinating natural gas, the apparatus comprising:
a dechlorination tower for providing overall dechlorination space;
an inertial separation distributor mounted near the inlet of the dechlorination column for performing step (i) inertial separation distribution: carrying out inertia separation distribution on the mined natural gas, wherein a part of chlorine-containing liquid drops are separated out, and the rest natural gas is uniformly distributed and ascends;
an atomizing nozzle arranged at the middle atomizing spray section of the dechlorinating tower and used for carrying out step (ii) atomizing spray washing: (ii) performing atomized spraying on the ascending natural gas obtained in the step (i) to capture chlorine-containing liquid drops in the natural gas, wherein the diameter of water mist particles of the atomized spraying is 50-1500 microns; and
a baffle demister and a cyclone separator installed at the upper part of the dechlorinating tower, for performing the gas-liquid separation of step (iii): and (ii) carrying out gas-liquid separation on the natural gas obtained in the step (ii) to finally obtain the dechlorinated natural gas.
In a preferred embodiment, the apparatus further comprises:
a downcomer arranged at the edge of the shell of the dechlorination tower and used for introducing the water separated by the cyclone separator into a chlorine water pool at the bottom of the tower; and
and the flash tank is connected with the bottom of the tower and is used for separating the waste water dissolved with high-concentration chloride ions in the chlorine water tank, and the clean water obtained after separation is condensed and then is introduced into the atomization spraying section through a pump for recycling.
In another preferred embodiment, the inertial separation distributor is a double row vane type, tapering inwardly from the inlet with a cone section angle of 10-20 °; the double-row blade distributor is characterized in that two rows of flow guide arc-shaped blades are arranged on two sides of an inlet of the double-row blade distributor, the top and the bottom of the double-row blade distributor are closed, and airflow is divided left and right along the two rows of blades.
In another preferred embodiment, a circular pipeline is arranged in the atomizing spray section, atomizing nozzles are uniformly distributed at the lower part of the pipeline, the sprayed water is in a fan shape, and the ratio of the water quantity to the air quantity of the atomizing spray is between 1/15 and 1/3, wherein the unit of the water quantity is L/h, and the unit of the air quantity is m3And h, welding the circular pipeline on the shell to be fixed, and arranging single layers or multiple layers.
In another preferred embodiment, the gas-liquid separation section is provided with a baffle demister, gas enters the gas-liquid separation section, a certain number of barbs are arranged on the plate, the barbs are in a shape of a circle, a triangle or a trapezoid, and the barbs can capture redundant liquid drops under the action of inertia force; and the rest gas is subjected to gas-liquid separation again through a single or a plurality of cyclone separators connected in parallel, the diameter of an inlet column section of each cyclone separator is 70-100mm, a hopper is arranged at the lower part of each cyclone separator to play a role in collection and liquid seal, and a wire mesh collector is arranged at the upper part of each cyclone separator to collect the rest liquid drops and a guide pipe.
Has the advantages that:
1. the atomization spraying is used for replacing the traditional water washing method, the same dechlorination effect is achieved, and the water consumption can be reduced by 50-70%.
2. The wastewater is recycled after passing through the flash tank, so that the energy utilization rate is high and the environment is protected.
3. The equipment volume is reduced, and the corresponding material use and manufacturing cost are also reduced.
4. The purification of natural gas is realized, and the long-period stable operation of equipment is ensured.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification to further illustrate the disclosure and not limit the disclosure.
FIG. 1 is a schematic diagram of a natural gas dechlorination process according to a preferred embodiment of the present disclosure.
FIG. 2 is a schematic view of a cyclonic separator according to a preferred embodiment of the present disclosure.
FIG. 3 is a schematic view of an inertial separation distributor according to a preferred embodiment of the present disclosure.
FIG. 4 is a graph of dechlorination efficiencies measured at different flow rates in the experiment of example 3 according to the process of the present invention.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The inventor of the application is through extensive and intensive research, to the problem that exists among the prior art, adopts the atomizing to spray the washing and replace the washing method, and inertia separation distributor, baffling board demister, cyclone and silk screen collector carry out many times gas-liquid separation in addition, and dechlorination efficiency is high in comparison with other methods, need not use chemical agent to a new technology of natural gas dechlorination of resource saving, environmental protection is provided. Based on the above findings, the present invention has been completed.
In a first aspect of the disclosure, there is provided a process for dechlorination of natural gas, the process comprising the steps of:
(i) inertial separation distribution: introducing the mined natural gas into an inertial separation distributor at an inlet at the lower part of a dechlorinating tower for inertial separation distribution, separating a part of chlorine-containing liquid drops in the gas subjected to inertial separation distribution to flow into a chlorine water pool at the bottom of the tower, and quickly and uniformly distributing the rest gas on the section of the tower and lifting the rest gas;
(ii) atomizing, spraying and washing: the natural gas is captured with chlorine ion-containing liquid drops through the atomization spraying section of the tower in the process of slowly rising, the diameter of the atomization spraying water mist is 50-1500 microns, and the atomization water drops which are captured with chlorine-containing liquid drops flow into a chlorine water pool at the bottom of the tower under the action of gravity; and
(iii) gas-liquid separation: and (3) the gas treated in the step (ii) rises and passes through a baffle plate demister, a cyclone separator and other equipment for gas-liquid separation, and finally dechlorinated natural gas and waste water dissolved with high-concentration chloride ions at the bottom of the tower are obtained, and the waste water can be recycled after passing through a flash tank and simultaneously the treated natural gas is led out.
In the present disclosure, in step (i), the natural gas comprises both direct subsea production and direct subsea production; the gas rapidly reaches a uniform distribution and rises in the column cross section through the inertial separation distributor arranged at the inlet.
In the present disclosure, in step (i), the gas velocity of the gas rising after passing through the inertial separation distributor is controlled to be 0.1 to 5 m/s.
In the present disclosure, in step (ii), the fine particle droplets sprayed by atomization are captured under the mechanisms of collision, Brownian diffusion interception and thermophoresis, and the amount of water (L/h)/the amount of air (m) sprayed by atomization3H) the ratio is between 1/15 and 1/3.
In the present disclosure, in step (iii), gas-liquid separation is performed through the baffled demister, and then further gas-liquid separation is performed through introducing a single or a plurality of cyclone separators connected in parallel, and finally, clean gas with chlorine content below 50ppm is collected.
In the disclosure, after the step (iii), the wastewater collected from the bottom of the tower is introduced into the flash tank, and the separated clean water reaches the atomization spraying section through the action of the pump to continuously complete the step (ii), so as to achieve the function of recycling.
In a second aspect of the disclosure, there is provided a plant for dechlorination of natural gas, the plant comprising:
the dechlorination tower is used for providing a dechlorination integral space, wherein the wall thickness of a shell of the dechlorination tower is 8-16mm, and the inner diameter is 300-600 mm;
the inertial separation distributor is arranged near the inlet of the tower and is used for enabling high-speed gas to be rapidly and uniformly distributed on the cross section of the tower and separating a part of solid impurities and liquid drops;
the atomizing nozzles are arranged at the middle section of the tower and are arranged in a single layer or multiple layers and used for trapping chlorine-containing liquid drops;
the baffle plate demister is arranged at the upper part of the tower, is used for separating chlorine-containing liquid drops from gas, and comprises a multi-fold-direction blade plate, a support frame, a baffle plate, a pipeline support, a pipe clamp and the like; the multi-folding structure increases the chance of trapping the liquid drops, and the liquid drops which are not removed are trapped at the next turning position under the same action, so that the demisting efficiency is greatly improved through repeated action; the removal rate of liquid drops reaches more than 98 percent;
the cyclone separator is arranged at the upper part of the tower and is used for further gas-liquid separation to obtain dechlorinated natural gas;
a downcomer arranged at the edge of the tower shell and used for introducing the water separated by the cyclone separator into a chlorine water pool at the bottom of the tower; and
and the flash tank is connected with the bottom of the tower and used for evaporating purified water, and the purified water is condensed and then introduced into the atomization spraying section through a pump for recycling.
In the disclosure, natural gas enters the inertial separation distributor from the inlet at the lower part of the tower so as to greatly reduce the rotation of materials and play a role in calming; the inertia separation distributor is a double-row vane type and is distributed from an inlet to the inside in a conical shape, and the inclination angle of the conical section is about 10-20 degrees; wherein, the biserial blade distributor means that its import both sides have two rows of water conservancy diversion arc-shaped blades, and top and bottom are all sealed, and the air current is left and right parts along two rows of blades, and the blade angle is about 10.
In the present disclosure, a circular pipeline is arranged in the atomizing spray section, atomizing nozzles are uniformly distributed at the lower part of the pipeline, the sprayed water mist is in a fan shape, the included angle between the sprayed water mist and the horizontal plane is about 15-45 degrees, the working mode is siphonage, the diameter of the sprayed water mist particles is 50-1500 microns, and the water amount (L/h)/air amount (m) is3H) the ratio is between 1/15 and 1/3, the circular pipes are welded on the shell and fixed, and single-layer or multi-layer arrangement is carried out.
In the disclosure, the gas-liquid separation section is provided with a baffle demister, gas enters the gas-liquid separation section, a certain number of barbs are arranged on the plate, and the barbs can be in a circular shape, a triangular shape, a trapezoidal shape and the like; the method is characterized in that redundant liquid drops are collected under the action of inertia force, gas-liquid separation is carried out on the residual gas through a single or a plurality of cyclone separators connected in parallel again, the diameter of an inlet column section of each separator is 70-100mm, the included angle between a conical section and the vertical direction is about 15 degrees, hoppers are arranged at the lower part of each separator to play a role in collection and liquid seal, a plurality of separators connected in parallel are connected together, a chlorine water tank is introduced to the bottom of the tower, and a silk screen collector is arranged at the upper part of each separator to collect the redundant liquid drops and a flow guide pipe.
Reference is made to the accompanying drawings.
FIG. 1 is a schematic diagram of a natural gas dechlorination process according to a preferred embodiment of the present disclosure. As shown in fig. 1, the natural gas (raw gas) is pumped into the inlet at the lower part of a dechlorination tower 1, after passing through an inertia separation distributor 2, a part of chlorine-containing liquid drops are separated and flow into a chlorine water pool 9 at the bottom of the tower, and the rest gas quickly reaches uniform distribution at the cross section of the tower and rises;
the natural gas led out from the inertia distribution separator 2 is used for capturing droplets containing chlorine ions in the gas through an atomizing nozzle 3 in an atomizing spray section of the tower, and the atomized water droplets which have captured the chlorine droplets flow into a chlorine water pool 9 at the bottom of the tower under the action of gravity;
the natural gas which continuously rises passes through the baffle plate demister 4, the gas is divided into a plurality of single-stranded channels after entering, and liquid drops in the gas collide on the corrugated plate to form a liquid film under the action of inertia force; the liquid film moves forwards along with the airflow to the turning part and is separated;
gas is subjected to gas-liquid separation under the action of centrifugal force through a plurality of cyclone separators 5 connected in parallel, liquid drops with large gravity flow into a hopper at the lower part along the wall surface of the conical section of the separator, an outlet of the hopper of the separator is connected with a downcomer 6 and introduced into a chlorine water pool 9 at the bottom of the tower, the gas continuously rises through an overflow pipe and passes through a wire mesh collector at the upper part to remove redundant liquid drops again, and liquid in the wire mesh collector flows out of a draft tube and is finally collected into clean natural gas; and (3) introducing the wastewater in the chlorine water tank into a flash tank 7, condensing flash steam, and then delivering the condensed flash steam to an atomization spraying section through a pump 8 for cyclic utilization.
FIG. 2 is a schematic view of a cyclonic separator according to a preferred embodiment of the present disclosure. As shown in figure 2, gas enters an inlet column section 5-2 of the cyclone separator through an inlet, liquid drops with large gravity flow into a lower hopper 5-1 along the wall surface of a conical section of the separator, the gas continuously rises through an overflow pipe and passes through an upper wire mesh collector 5-3 to remove redundant liquid drops again, liquid in the wire mesh collector flows out of a draft pipe 5-4, and clean natural gas is finally led out.
FIG. 3 is a schematic view of an inertial separation distributor according to a preferred embodiment of the present disclosure. As shown in FIG. 3, the inertial separation distributor is a double-row blade type, and is distributed in a conical shape from the inlet to the inside, and the inclination angle of the conical section is about 10-20 degrees; two rows of guide arc-shaped blades are arranged on two sides of an inlet of the air conditioner, the top and the bottom of the air conditioner are closed, airflow is separated from left to right along the two rows of blades, and the angle of each blade is 10 degrees.
Examples
The invention is further illustrated below with reference to specific examples. It is to be understood, however, that these examples are illustrative only and are not to be construed as limiting the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the manufacturer. All percentages and parts are by weight unless otherwise indicated.
Example 1:
a certain oil and gas exploitation factory needs to process natural gas with the chlorine-containing liquid drop concentration of 20000ppm and the gas flow is 6500m3H, pressure 8.37MPa, temperature 37 ℃.
1. Process flow
As shown in fig. 1-2. Firstly, under the drive of a fan, the natural gas which is just mined is led into an air inlet at the lower part of a tower through a pipeline, part of chlorine-containing liquid drops in the gas are separated out and flow into a chlorine water tank at the bottom of the tower through an inertia separation distributor arranged at the inlet, and the rest of gas is quickly and uniformly distributed and ascends on the section of the tower due to the characteristics of a conical distributor; the natural gas led out by the inertia separation distributor is used for trapping liquid drops containing chloride ions in the gas through an atomization spraying section of the tower, and atomized water drops trapping the chlorine-containing liquid drops flow into a chlorine water pool at the bottom of the tower under the action of gravity; the natural gas continuously rising passes through the baffle plate demister, the gas is divided into a plurality of single-stranded channels after entering, and liquid drops in the gas collide on the corrugated plate to form a liquid film under the action of inertia force; the liquid film moves forward along with the airflow to the turning part to be separated, and is introduced into a chlorine water tank at the bottom of the tower through a pipeline; the natural gas is subjected to gas-liquid separation under the action of centrifugal force through a plurality of cyclone separators connected in parallel, liquid drops with large gravity flow into a hopper at the lower part along the wall surface of the conical section of the separator, an outlet of the hopper of the separator is connected with a downcomer and introduced into a chlorine water tank at the bottom of the tower, the gas continuously rises through an overflow pipe and passes through a wire mesh collector arranged at the top of the separator to remove redundant liquid drops again, and then clean natural gas is led out.
2. Results of the experiment
Finally, the chlorine content of the treated natural gas is measured to be below 50 ppm.
Example 2:
a certain offshore mining platform needs to process natural gas with chlorine concentration of 30000ppm and gas flow of 8000m3H, pressure of 12MPa and temperature of 20 ℃.
1. Process flow
As shown in fig. 1-2. Firstly, under the drive of a fan, the natural gas which is just mined is led into an air inlet at the lower part of a tower through a pipeline, part of chlorine-containing liquid drops in the gas are separated out and flow into a chlorine water tank at the bottom of the tower through an inertia separation distributor arranged at the inlet, and the rest of gas is quickly and uniformly distributed and ascends on the section of the tower due to the characteristics of a conical distributor; the natural gas led out by the inertia separation distributor is used for trapping liquid drops containing chloride ions in the gas through an atomization spraying section of the tower, and atomized water drops trapping the chlorine-containing liquid drops flow into a chlorine water pool at the bottom of the tower under the action of gravity; the natural gas continuously rising passes through the baffle plate demister, the gas is divided into a plurality of single-stranded channels after entering, and liquid drops in the gas collide on the corrugated plate to form a liquid film under the action of inertia force; the liquid film moves forward along with the airflow to the turning part to be separated, and is introduced into a chlorine water tank at the bottom of the tower through a pipeline; the natural gas is subjected to gas-liquid separation under the action of centrifugal force through a plurality of cyclone separators connected in parallel, liquid drops with large gravity flow into a hopper at the lower part along the wall surface of the conical section of the separator, an outlet of the hopper of the separator is connected with a downcomer and introduced into a chlorine water tank at the bottom of the tower, the gas continuously rises through an overflow pipe and passes through a wire mesh collector arranged at the top of the separator to remove redundant liquid drops again, and then clean natural gas is led out.
2. Results of the experiment
Finally, the concentration of the chloride ion of the treated natural gas is measured to be below 100 ppm.
Example 3:
10000ppm of sodium chloride solution is prepared in a laboratory, atomized by an ultrasonic atomizer and driven by a fan to enter a desorption deviceThe inlet of the chlorine tower and the flow rates of four groups of experimental fans are respectively 30m3/h、50m3/h、70m3H and 90m3The superficial gas velocities were 0.265m/s, 0.442m/s, 0.619m/s and 0.796m/s, respectively, at room temperature 25 ℃ during the experiment.
1. Process flow
As shown in fig. 1-2. Firstly, removing a part of chlorine-containing liquid drops through an inlet inertia separation distributor, then continuously separating a part of liquid drops in the gas by the continuously ascending gas through a baffle plate demister, and finally carrying out gas-liquid separation through a cyclone separator.
2. Results of the experiment
Finally, the dechlorination efficiency reaches over 90 percent, as shown in figure 4.
The above-listed embodiments are merely preferred embodiments of the present disclosure, and are not intended to limit the scope of the present disclosure. That is, all equivalent changes and modifications made according to the contents of the claims of the present application should be considered to be within the technical scope of the present disclosure.
All documents referred to in this disclosure are incorporated by reference into this application as if each were individually incorporated by reference. Furthermore, it should be understood that various changes or modifications to the disclosure may be made by those skilled in the art after reading the above teachings of the disclosure, and such equivalents may fall within the scope of the disclosure as defined by the appended claims.
Claims (10)
1. A process for dechlorinating natural gas, the process comprising the steps of:
(i) inertial separation distribution: carrying out inertia separation distribution on the mined natural gas, wherein a part of chlorine-containing liquid drops are separated out, and the rest natural gas is uniformly distributed and ascends;
(ii) atomizing, spraying and washing: (ii) performing atomized spraying on the ascending natural gas obtained in the step (i) to capture chlorine-containing liquid drops in the natural gas, wherein the diameter of water mist particles of the atomized spraying is 50-1500 microns; and
(iii) gas-liquid separation: and (ii) carrying out gas-liquid separation on the natural gas obtained in the step (ii) to finally obtain the dechlorinated natural gas.
2. The method of claim 1, wherein in step (i), the natural gas comprises bottom-of-the-earth directly-produced natural gas and bottom-of-the-earth directly-produced natural gas; the gas velocity of the gas rising after the gas is subjected to inertial separation distribution by the inertial separation distributor is controlled to be 0.1-5 m/s.
3. The method of claim 1, wherein in step (ii), the small particle droplets sprayed by atomization are captured by collision, diffusion interception, and thermophoresis mechanisms, and the ratio of the amount of water/the amount of gas sprayed by atomization is between 1/15 and 1/3, wherein the amount of water is expressed in L/h and the amount of gas is expressed in m3/h。
4. The method of claim 1, wherein in step (iii), gas-liquid separation is carried out by a baffled demister, and further gas-liquid separation is carried out by introducing into a single or a plurality of cyclone separators connected in parallel, and finally clean gas with chlorine content not higher than 50ppm is collected.
5. The method of claim 1, further comprising: and introducing the wastewater dissolved with high-concentration chloride ions and collected after gas-liquid separation into a flash tank for separation, and obtaining clean water after separation for circulating defogging spraying washing.
6. A plant for dechlorinating natural gas, the plant comprising:
a dechlorination tower (1) for providing a dechlorination overall space;
an inertial separation distributor (2) installed near the inlet of the dechlorination tower (1) for performing step (i) inertial separation distribution: carrying out inertia separation distribution on the mined natural gas, wherein a part of chlorine-containing liquid drops are separated out, and the rest natural gas is uniformly distributed and ascends;
an atomizing nozzle (3) arranged at the middle atomizing spray section of the dechlorinating tower (1) and used for carrying out step (ii) atomizing spray washing: (ii) performing atomized spraying on the ascending natural gas obtained in the step (i) to capture chlorine-containing liquid drops in the natural gas, wherein the diameter of water mist particles of the atomized spraying is 50-1500 microns; and
a baffle demister (4) and a cyclone separator (5) which are arranged at the upper part of the dechlorinating tower (1) and are used for carrying out gas-liquid separation in the step (iii): and (ii) carrying out gas-liquid separation on the natural gas obtained in the step (ii) to finally obtain the dechlorinated natural gas.
7. The apparatus of claim 6, further comprising:
a downcomer (6) arranged at the edge of the shell of the dechlorination tower (1) and used for introducing the water separated by the cyclone separator (5) into a chlorine water tank (9) at the bottom of the tower; and
and the flash tank (7) is connected with the bottom of the tower and is used for separating the waste water dissolved with high-concentration chloride ions in the chlorine water tank (9), and clean water obtained after separation is condensed and then is introduced into the atomization spraying section through the pump (8) for recycling.
8. The apparatus according to claim 6 or 7, wherein the inertial separation distributor is a double row vane type, tapering inwardly from the inlet with a cone section angle of 10-20 °; the double-row blade distributor is characterized in that two rows of flow guide arc-shaped blades are arranged on two sides of an inlet of the double-row blade distributor, the top and the bottom of the double-row blade distributor are closed, and airflow is divided left and right along the two rows of blades.
9. The apparatus according to claim 6 or 7, characterized in that the atomizing spray section is provided with a circular pipe, the lower part of the pipe is provided with the atomizing nozzles (3) uniformly, the sprayed water is in a fan shape, the ratio of the water quantity/air quantity of the atomizing spray is 1/15-1/3, wherein the unit of the water quantity is L/h, and the unit of the air quantity is m3And h, welding the circular pipeline on the shell to be fixed, and arranging single layers or multiple layers.
10. The apparatus according to claim 6 or 7, characterized in that the gas-liquid separation section is provided with a baffled demister (4) into which the gas enters, and on which a number of barbs are arranged, the shape of which comprises round, triangular and trapezoidal, to catch the excess droplets under the action of inertia; the rest gas is subjected to gas-liquid separation again through a single or a plurality of cyclone separators (5) connected in parallel, the diameter of an inlet column section (5-2) of each cyclone separator is 70-100mm, a hopper (5-1) is arranged at the lower part of each cyclone separator to play the roles of collection and liquid seal, a wire mesh collector (5-3) is arranged at the upper part of each cyclone separator to collect the redundant liquid drops, and a guide pipe (5-4) is arranged at the upper part of each cyclone separator.
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| CN202110988735.XA CN113637509A (en) | 2021-08-26 | 2021-08-26 | Method and device for dechlorinating natural gas |
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| CN202110988735.XA CN113637509A (en) | 2021-08-26 | 2021-08-26 | Method and device for dechlorinating natural gas |
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