CN115745324A - Device and method for removing hydrogen sulfide from sulfur-containing produced water of oil and gas field - Google Patents
Device and method for removing hydrogen sulfide from sulfur-containing produced water of oil and gas field Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 139
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 54
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 229910052717 sulfur Inorganic materials 0.000 title claims abstract description 53
- 239000011593 sulfur Substances 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000007789 gas Substances 0.000 title claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 106
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- 239000003795 chemical substances by application Substances 0.000 claims description 30
- 238000000926 separation method Methods 0.000 claims description 27
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims description 15
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Abstract
The invention relates to a device and a method for removing hydrogen sulfide from sulfur-containing produced water in an oil and gas field, which comprises a pretreatment system and a hydrogen sulfide removal system; the pretreatment system is connected with the sulfur-containing produced water; the pretreatment system comprises a gravity settling tank, a mixing tank, an air floatation separator, a filter and a buffer tank which are connected in sequence, and the sulfur-containing produced water is connected with the gravity settling tank; the hydrogen sulfide removal system comprises a hollow fiber supported liquid membrane component, a water purification tank and a phase receiving liquid tank which are connected in sequence; the hollow fiber supported liquid membrane component comprises a membrane shell and a hollow fiber supported liquid membrane bundle pipe which are arranged from outside to inside; two side ports of the membrane shell are respectively provided with a sealing baffle, the shell pass is provided with a shell pass inlet and a shell pass outlet, and the tube pass is provided with a tube pass inlet and a tube pass outlet; the tube pass inlet is connected to the buffer tank, and the tube pass outlet is connected to the water purification tank; the shell pass outlet is connected with the shell pass inlet through a phase liquid receiving groove. The invention can simultaneously carry out extraction and back extraction processes.
Description
Technical Field
The invention relates to the technical field of hydrogen sulfide removal in sulfur-containing produced water in oil and gas fields, in particular to a device and a method for removing hydrogen sulfide from sulfur-containing produced water based on a hollow fiber support liquid membrane method.
Background
Produced water from oil and gas fields is formation water that is concomitantly drained during oil and gas production. In sulfur-containing oil and gas fields, a large amount of hydrogen sulfide gas is generated by the formation due to biological formation or thermochemical formation, so that the sulfide content in the produced water is high. For high-sulfur oil and gas fields, the sulfide content in the produced water even reaches more than 500 mg/L. Sulfides in the produced water can cause serious corrosion to underground and ground pipelines and equipment; in addition, under the acidic condition, sulfide escapes in the form of hydrogen sulfide gas, and the health and life safety of personnel are greatly harmed.
The common sulfur-containing wastewater treatment methods mainly comprise a chemical oxidation method, a chemical precipitation method, an absorption method, a steam stripping method and the like. Wherein, the steam stripping method is mainly used for treating the sulfur-containing wastewater of large-scale refineries due to large equipment and high investment; the absorption method often requires the use of a large amount of absorbent and the cost of the agent is high. The commonly used method for removing sulfur from produced water in oil and gas fields is a precipitation method and an oxidation method, however, the two methods require a large amount of chemical agents, the cost of the agents is huge, huge economic cost is caused for the production of the oil and gas fields, and a large amount of sludge is generated to cause secondary pollution.
The liquid membrane separation technology is a new separation technology which is started in the 70 th century in the 20 th century, and has the advantages of fast mass transfer, high separation efficiency, low energy consumption, small equipment occupation, wide application and the like, thereby arousing the attention of relevant experts and scholars at home and abroad, and developing extensive fundamental research and application research successively. Professor Li Nianzhi and professor He Wenshou of the famous Chinese scientist have conducted long-term studies on liquid film mass transfer mechanisms, industrial applications, and the like. The development of the liquid membrane successively passes through the stages of the emulsified liquid membrane, the supported liquid membrane and the like, the emulsified liquid membrane is researched at the earliest, and the research of the emulsified liquid membrane for removing H2S in wastewater is jointly carried out by units such as university of continental engineering and Zheng State university, so that the removal rate can reach 96 to 99 percent, and the method is an efficient hydrogen sulfide removal means. However, the emulsion membrane process needs to undergo operations such as emulsion preparation, separation, emulsion breaking and the like, and has complex process and difficult operation; in addition, stability is poor. And the supporting liquid membrane does not need the links of emulsion making and breaking, and the operation of the liquid membrane separation process is greatly simplified. However, no report of removing hydrogen sulfide in the sulfur-containing produced water by adopting a supported liquid film is found at present.
Disclosure of Invention
The invention aims to solve the problems and provides a device and a method for removing hydrogen sulfide from sulfur-containing produced water based on a hollow fiber support liquid membrane method.
The technical scheme of the invention is as follows:
the invention provides a hydrogen sulfide removal device for sulfur-containing produced water of an oil and gas field.
A device for removing hydrogen sulfide from sulfur-containing produced water in an oil and gas field comprises a pretreatment system and a hydrogen sulfide removal system which are sequentially connected; wherein the pretreatment system is connected to the sour produced water; the pretreatment system comprises a gravity settling tank, a mixing tank, an air floatation separator, a filter and a buffer tank which are connected in sequence, and the sulfur-containing produced water is connected with the gravity settling tank; the hydrogen sulfide removal system comprises a hollow fiber supported liquid membrane component, a water purification tank and a phase receiving liquid tank which are connected in sequence; the hollow fiber supported liquid membrane component comprises a membrane shell and a hollow fiber supported liquid membrane bundle pipe which are arranged from outside to inside; two side ports of the membrane shell are respectively provided with a sealing baffle, the shell pass is provided with a shell pass inlet and a shell pass outlet, and the tube pass is provided with a tube pass inlet and a tube pass outlet; the tube pass inlet is connected to the buffer tank, and the tube pass outlet is connected to the purified water tank; the shell pass outlet is connected with the shell pass inlet through a phase liquid receiving groove.
Preferably, the mixing tank is connected with an inorganic flocculant dosing tank through a first dosing pump, is connected with an organic flocculant dosing tank through a second dosing pump, and is connected with a first pH regulator dosing tank through a third dosing pump.
The buffer tank is connected with a second pH regulator dosing tank through a fourth dosing pump.
And a water inlet pump is arranged between the sulfur-containing produced water and the gravity settling tank, a pressure pump is arranged between the air floatation separator and the filter, a first metering pump is arranged between the buffer tank and the tube side inlet, and a second metering pump is arranged between the shell side outlet and the shell side inlet.
The air floatation separator is an air floatation tank.
The filter is a multi-media filter.
The membrane aperture of the hollow fiber supported liquid membrane bundle tube is 250-450 μm, and the wall thickness of the membrane bundle tube is 50-100 μm.
And a stirring device is arranged in the phase liquid receiving tank.
The invention provides a method for removing hydrogen sulfide from sulfur-containing produced water in an oil and gas field.
A hydrogen sulfide removal method for sulfur-containing produced water of an oil and gas field uses the hydrogen sulfide removal device for sulfur-containing produced water of the oil and gas field, and comprises the following steps:
(1) Pretreatment: at room temperature, the sulfur-containing produced water enters a gravity settling tank for oil-water separation, the water phase after oil-water separation enters a mixing tank and is fully mixed with the medicament, then enters an air flotation separator for aeration air flotation solid-liquid separation, the water phase after air flotation separation enters a filter for further filtration, the filtered water phase enters a buffer tank, and the pH value of the water phase is adjusted to acidity;
(2) Removing hydrogen sulfide: removing hydrogen sulfide by adopting a cross-flow liquid membrane process;
receiving phase solution is arranged in the receiving phase liquid tank, the receiving phase solution is a mixture of an extracting agent and a back-extracting agent, and the mixing volume ratio of the back-extracting agent to the extracting agent is (5-20): 1;
at room temperature, pumping the receiving phase solution in the receiving phase liquid tank into the shell side of the hollow fiber supported liquid membrane component, soaking the hollow fiber supported liquid membrane bundle tube in the receiving phase solution, and adsorbing an extracting agent in the receiving phase solution in the gaps of the hydrophobic hollow fiber supported liquid membrane; pumping pretreated sulfur-containing produced water in a buffer tank into a hollow fiber supported liquid membrane bundle tube in a tube pass of a hollow fiber supported liquid membrane assembly, complexing hydrogen sulfide molecules in the sulfur-containing produced water in the tube pass with an extracting agent in a receiving phase solution in a gap of the hollow fiber supported liquid membrane to form a complex, transferring mass to a shell pass by the hollow fiber supported liquid membrane, and decomplexing the complex by the stripping agent in the receiving phase solution in the shell pass to realize stripping; after the extraction and back extraction processes are finished, the water phase flows into a water purification tank from a tube pass outlet so as to remove hydrogen sulfide in the water; and the receiving phase solution flows back to the receiving phase liquid tank from the shell pass outlet to realize the circulation of the receiving phase solution.
Preferably, the sulfide content of the sulfur-containing produced water is 5-700 mg/L;
the medicament comprises an inorganic flocculant, an organic flocculant and a first pH regulator;
the inorganic flocculant is polyaluminium chloride solution, and the dosage is 300-1000ppm;
the organic flocculant is polyacrylamide solution, and the dosage of the organic flocculant is 250-750 ppm;
the gas-water ratio of the air floatation separator is 6-10;
the buffer tank adjusts the pH value of the water phase to 6-7;
the extracting agent is a kerosene organic phase in which EDA is dissolved, wherein the content of EDA is 2% -5%;
the back extractant is NaOH aqueous solution, wherein the concentration of NaOH is 0.5-3.0 mol/L.
Wherein the flow speed of the sulfur-containing produced water in the hollow fiber supported liquid membrane bundle tube is 200-500 mL/min;
the flow rate of the receiving phase solution in the shell side is 200-500 ml/min.
The invention has the technical effects that:
(1) The cross flow process of the hollow fiber supported liquid membrane provided by the invention can simultaneously carry out the extraction and back extraction processes, the flow is greatly simplified compared with the extraction process, the equipment is simple, the occupied area is small, the fixed investment is small, and the continuous operation can be realized; the hollow fiber supported liquid membrane technology breaks the chemical balance of the traditional extraction method, the mass transfer driving force is larger, and the separation efficiency is high;
(2) Compared with the defect that the extractant is easy to lose by a fixed carrier liquid membrane method for fixing the organic extraction phase in the membrane pores, the extractant in the invention can continuously circulate in a phase receiving liquid tank and the shell side of a hollow fiber supported liquid membrane component, so that the hollow fiber supported liquid membrane is more stable;
(3) Compared with the method in which the organic extraction phase exists in the extraction cavity between the two flat liquid membranes in the flat supported liquid membrane method, the method has the advantages that the extraction agent and the back extraction agent phase exist in the shell pass of the hollow fiber supported liquid membrane component in a mixed mode, so that the mass transfer distance is small, the mass transfer resistance is small, the mass transfer driving force is large, and the mass transfer effect is good;
(4) The mobile phase in the shell pass is a receiving phase solution, namely an extraction phase and a back extraction solution which are mixed in a certain proportion, so that the extraction and the back extraction processes can be simultaneously realized in the hollow fiber supported liquid membrane assembly, additional back extraction equipment is not needed, and the extractant can be directly recycled in the shell pass.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Reference numerals: 1. a gravity settling tank; 2. a mixing tank; 3. an air flotation separator; 4. a multi-media filter; 5. a buffer tank; 6. a hollow fiber supported liquid membrane assembly; 7. a water purification tank; 8. a receiving phase liquid tank; 9. an inorganic flocculant dosing tank; 10. an organic flocculant dosing tank; 11. a first pH regulator dosing tank; 12. a second pH regulator dosing tank; 13. a water inlet pump; 14. a pressure pump; 15. a left sealing baffle; 16. a right sealing baffle; 17. a tube side inlet; 18. a tube side outlet; 19. a shell side inlet; 20. and a shell side outlet.
Detailed Description
Example 1
A device for removing hydrogen sulfide from sulfur-containing produced water in an oil and gas field comprises a pretreatment system and a hydrogen sulfide removal system which are sequentially connected; wherein the pretreatment system is connected to the sour produced water; the pretreatment system comprises a gravity settling tank 1, a mixing tank 2, an air floatation separator 3, a filter and a buffer tank 5 which are connected in sequence, and the sulfur-containing produced water is connected with the gravity settling tank 1; the hydrogen sulfide removal system comprises a hollow fiber supported liquid membrane component 6, a water purification tank 7 and a receiving phase liquid tank 8 which are connected in sequence; the hollow fiber supported liquid membrane component 6 comprises a membrane shell and a hollow fiber supported liquid membrane bundle pipe which are arranged from outside to inside; two side ports of the membrane shell are respectively provided with a sealing baffle, the shell side is provided with a shell side inlet 19 and a shell side outlet 20, and the tube side is provided with a tube side inlet 17 and a tube side outlet 18; the tube side inlet 17 is connected to the buffer tank 5, and the tube side outlet 18 is connected to the purified water tank 7; the shell-side outlet 20 is connected with the shell-side inlet 19 through the receiving phase liquid tank 8.
The specific implementation process of the embodiment is as follows:
(1) Pretreatment: at room temperature, the sulfur-containing produced water enters a gravity settling tank 1 for oil-water separation, a water phase after oil-water separation enters a mixing tank 2 to be fully mixed with a medicament and then enters an air floatation separator 3 for aeration air floatation solid-liquid separation, the water phase after air floatation separation enters a filter for further filtration, the filtered water phase enters a buffer tank 5, and the pH value of the water phase is adjusted to acidity;
(2) Hydrogen sulfide removal: removing hydrogen sulfide by adopting a cross-flow liquid membrane process;
a receiving phase solution is arranged in the receiving phase liquid tank 8, the receiving phase solution is a mixture of an extracting agent and a back-extracting agent, and the volume ratio of the back-extracting agent to the extracting agent is (5-20): 1;
at room temperature, pumping the receiving phase solution in the receiving phase liquid tank 8 into the shell side of the hollow fiber supported liquid membrane component 6, soaking the hollow fiber supported liquid membrane bundle tube in the receiving phase solution, and adsorbing an extracting agent in the receiving phase solution in the gaps of the hydrophobic hollow fiber supported liquid membrane; pumping pretreated sulfur-containing produced water in the buffer tank 5 into a hollow fiber supported liquid membrane bundle tube in a tube pass of the hollow fiber supported liquid membrane component 6, complexing hydrogen sulfide molecules in the sulfur-containing produced water in the tube pass with an extractant in a receiving phase solution in a hollow fiber supported liquid membrane gap to form a complex, transferring the complex to a shell pass by the hollow fiber supported liquid membrane, and then decomplexing the complex by the back extractant in the receiving phase solution in the shell pass to realize back extraction; after the extraction and back extraction processes are finished, the water phase flows into the water purification tank 7 from the tube pass outlet 18 so as to remove hydrogen sulfide in the water; the receiving phase solution is returned from the shell side outlet 20 to the receiving phase liquid tank 8 to circulate the receiving phase solution.
Wherein, preferably, the sulfide content in the sulfur-containing produced water is 5-700 mg/L; the medicament comprises an inorganic flocculant, an organic flocculant and a first pH regulator; the inorganic flocculant is polyaluminium chloride solution, and the dosage is 300-1000ppm; the organic flocculant is polyacrylamide solution, and the dosage of the organic flocculant is 250-750 ppm; the gas-water ratio of the air floatation separator 3 is 6-10; the buffer tank 5 adjusts the pH value of the water phase to 6-7; the extracting agent is a kerosene organic phase in which EDA is dissolved, wherein the content of EDA is 2% -5%; the back extractant is NaOH aqueous solution, wherein the concentration of NaOH is 0.5-3.0 mol/L. Wherein the flow speed of the sulfur-containing produced water in the hollow fiber supported liquid membrane bundle tube is 200-500 mL/min; the flow rate of the receiving phase solution in the shell side is 200-500 ml/min.
Example 2
On the basis of embodiment 1, the method further comprises the following steps:
mixing tank 2 is connected with inorganic flocculant dosing tank 9 through first dosing pump, is connected with organic flocculant dosing tank 10 through the second dosing pump, is connected with first pH regulator dosing tank 11 through the third dosing pump. The buffer tank 5 is connected with a second pH regulator dosing tank 12 through a fourth dosing pump. A water inlet pump 13 is arranged between the sulfur-containing produced water and the gravity settling tank 1, a pressure pump 14 is arranged between the air floatation separator 3 and the filter, a first metering pump is arranged between the buffer tank 5 and the tube side inlet 17, and a second metering pump is arranged between the shell side outlet 20 and the shell side inlet 19. The air floatation separator 3 is an air floatation tank. The filter is a multimedia filter 4. The membrane aperture of the hollow fiber supported liquid membrane bundle tube is 250-450 μm, and the wall thickness of the membrane bundle tube is 50-100 μm; a left sealing baffle 15 is arranged at the left port of the membrane shell, and a right sealing baffle 16 is arranged at the right port of the membrane shell; and a stirring device is arranged in the receiving phase liquid tank 8.
Specific Experimental example 1
At room temperature, the sulfur-containing produced water with the concentration of 10mg/L and the pH value of 6 enters a gravity settling tank 1 through a water inlet pump 13 to perform gravity settling oil-water separation and enters a mixing tank 2, 500mg/L PAC solution, 250 mg/L PAM solution and 5% NaOH solution are pumped into the mixing tank 2 through a dosing pump respectively and are fully mixed with the produced water after oil removal to form mixed water, the mixed water enters an air floatation tank to perform flocculation reaction and aeration air floatation solid-liquid separation, and the water after air floatation separation enters a multi-media filter 4 through a pressure pump 14; the effluent of the multi-medium filter 4 enters a buffer tank 5 through a pipeline, 5 percent of HCl solution is pumped into the buffer tank 5 through a dosing pump, the pH is adjusted to 6, and hydrogen sulfide is removed by adopting a cross-flow liquid membrane process;
the extractant was a kerosene organic solution containing 2% EDA, the stripping agent was an aqueous solution containing 0.5mol/L NaOH, and the stripping agent and the extractant were mixed at 5:1 to form a receiving phase solution; the received phase solution is pumped into the shell pass of the hollow fiber supported liquid membrane component 6 through a second metering pump and a shell pass inlet 19, and the flow rate is 500ml/min; pumping the pretreated water in the buffer tank 5 into a hollow fiber supported liquid membrane bundle tube of the tube pass of the hollow fiber supported liquid membrane component 6 through a tube pass inlet 17 by a first metering pump, wherein the flow rate is 400ml/min; after the extraction and back extraction processes are finished, water flows into the water purifying tank 7 from the tube pass outlet 18, so that hydrogen sulfide in the water is removed; the receiving phase solution flows back from the shell side outlet 20 to the receiving phase liquid tank 8 to realize the circulation of the receiving phase solution;
and (3) detecting the sulfide content of the purified water in the water purification tank 7, wherein the sulfide content is 0.1 mg/L, and the sulfide removal rate reaches 99%.
Specific Experimental example 2
At room temperature, sulfur-containing produced water with the concentration of 300mg/L and the pH value of 7 enters a gravity settling tank 1 through a water inlet pump 13 to perform gravity settling oil-water separation and enters a mixing tank 2, 500mg/L PAC solution, 250 mg/L PAM solution and 5% NaOH solution are pumped into the mixing tank 2 through a dosing pump respectively and are fully mixed with the produced water after oil removal to form mixed water, the mixed water enters an air flotation tank to perform flocculation reaction and aeration air flotation solid-liquid separation, and the water after air flotation separation enters a multi-media filter 4 through a pressure pump 14; the effluent of the multi-medium filter 4 enters a buffer tank 5 through a pipeline, 5 percent of HCl solution is pumped into the buffer tank 5 through a dosing pump, the pH is adjusted to 6.5, and hydrogen sulfide is removed by adopting a cross-flow liquid membrane process;
the extractant was a kerosene organic solution containing 2% eda, the stripping agent was an aqueous solution containing 3 mol/L NaOH, and the stripping agent was mixed with the extractant at 20; the received phase solution is pumped into the shell pass of the hollow fiber supported liquid membrane component 6 through a second metering pump and a shell pass inlet 19, and the flow rate is 200ml/min; pumping the pretreated water in the buffer tank 5 into a hollow fiber supported liquid membrane bundle tube of the tube pass of the hollow fiber supported liquid membrane component 6 through a tube pass inlet 17 by a first metering pump, wherein the flow rate is 200ml/min; after the extraction and back extraction processes are finished, water flows into the water purification tank 7 from the tube pass outlet 18, so that hydrogen sulfide in the water is removed; the receiving phase solution flows back from the shell side outlet 20 to the receiving phase liquid tank 8 to realize the circulation of the receiving phase solution;
and (3) detecting the sulfide content of the purified water in the water purification tank 7, wherein the sulfide content is 5 mg/L, and the sulfide removal rate reaches 98.33%.
Specific Experimental example 3
At room temperature, sulfur-containing produced water with the concentration of 150mg/L and the pH value of 6.5 enters a gravity settling tank 1 through a water inlet pump 13 to perform gravity settling oil-water separation and enters a mixing tank 2, 500mg/L PAC solution, 250 mg/L PAM solution and 5% NaOH solution are respectively pumped into the mixing tank 2 through a dosing pump to be fully mixed with the produced water after oil removal to form mixed water, the mixed water enters an air flotation tank to perform flocculation reaction and aeration air flotation solid-liquid separation, and the water after air flotation separation enters a multi-media filter 4 through a pressure pump 14; the effluent from the multimedia filter 4 is piped into a buffer tank 5,5% HCl solution is pumped into the buffer tank 5 by means of a dosing pump, the pH is adjusted to 6, and the hydrogen sulfide removal is carried out by means of a cross-flow liquid membrane process;
the extractant was a kerosene organic solution containing 2% EDA, the back extractant was an aqueous solution containing 1.5mol/L NaOH, the back extractant was mixed with the extractant at 10; the received phase solution is pumped into the shell pass of the hollow fiber supported liquid membrane component 6 through a second metering pump and a shell pass inlet 19, and the flow rate is 300ml/min; pumping the pretreated water in the buffer tank 5 into a hollow fiber supported liquid membrane bundle tube of the tube pass of the hollow fiber supported liquid membrane component 6 through a tube pass inlet 17 by a first metering pump, wherein the flow rate is 250ml/min; after the extraction and back extraction processes are finished, water flows into the water purification tank 7 from the tube pass outlet 18, so that hydrogen sulfide in the water is removed; the receiving phase solution flows back from the shell side outlet 20 to the receiving phase liquid tank 8 to realize the circulation of the receiving phase solution;
and (3) detecting the sulfide content of the purified water in the water purification tank 7, wherein the sulfide content is 1.3 mg/L, and the sulfide removal rate reaches 99.63%.
Claims (10)
1. The utility model provides an oil gas field contains sulphur produced water hydrogen sulfide removal device which characterized in that: comprises a pretreatment system and a hydrogen sulfide removal system which are connected in sequence; wherein the pretreatment system is connected to the sour produced water; the pretreatment system comprises a gravity settling tank (1), a mixing tank (2), an air floatation separator (3), a filter and a buffer tank (5) which are connected in sequence, and the sulfur-containing produced water is connected with the gravity settling tank (1); the hydrogen sulfide removal system comprises a hollow fiber supported liquid membrane component (6), a water purification tank (7) and a receiving phase liquid tank (8) which are connected in sequence; the hollow fiber supported liquid membrane component (6) comprises a membrane shell and a hollow fiber supported liquid membrane bundle pipe which are arranged from outside to inside; two side ports of the membrane shell are respectively provided with a sealing baffle, the shell side is provided with a shell side inlet (19) and a shell side outlet (20), and the tube side is provided with a tube side inlet (17) and a tube side outlet (18); the tube pass inlet (17) is connected to the buffer tank (5), and the tube pass outlet (18) is connected to the purified water tank (7); the shell side outlet (20) is connected with the shell side inlet (19) through a phase receiving liquid tank (8).
2. The oil and gas field sulfur-containing produced water hydrogen sulfide removal device of claim 1, characterized in that: the mixing tank (2) is connected with an inorganic flocculant dosing tank (9) through a first dosing pump, is connected with an organic flocculant dosing tank (10) through a second dosing pump, and is connected with a first pH regulator dosing tank (11) through a third dosing pump.
3. The oil and gas field sulfur-containing produced water hydrogen sulfide removal device of claim 2, characterized in that: the buffer tank (5) is connected with a second pH regulator dosing tank (12) through a fourth dosing pump.
4. The oil and gas field sulfur-containing produced water hydrogen sulfide removal device of claim 3, characterized in that: a water inlet pump (13) is arranged between the sulfur-containing produced water and the gravity settling tank (1), a pressure pump (14) is arranged between the air floatation separator (3) and the filter, a first metering pump is arranged between the buffer tank (5) and the tube side inlet (17), and a second metering pump is arranged between the shell side outlet (20) and the shell side inlet (19).
5. The oil and gas field sulfur-containing produced water hydrogen sulfide removal device of claim 4, characterized in that: the air floatation separator (3) is an air floatation tank.
6. The oil and gas field sulfur-containing produced water hydrogen sulfide removal device of claim 5, characterized in that: the filter is a multi-media filter (4).
7. The oil and gas field sulfur-containing produced water hydrogen sulfide removal device of claim 6, which is characterized in that: the membrane aperture of the hollow fiber supported liquid membrane bundle tube is 250-450 μm, and the wall thickness of the membrane bundle tube is 50-100 μm.
8. The oil and gas field sulfur-containing produced water hydrogen sulfide removal device of claim 7, characterized in that: a stirring device is arranged in the phase receiving liquid tank (8).
9. A method for removing hydrogen sulfide from sulfur-containing produced water in an oil and gas field is characterized by comprising the following steps: the oil and gas field sulfur-containing produced water hydrogen sulfide removal device of any one of claims 1-8 is used, and the method comprises the following steps:
(1) Pretreatment: at room temperature, sulfur-containing produced water enters a gravity settling tank (1) for oil-water separation, a water phase after the oil-water separation enters a mixing tank (2) to be fully mixed with a medicament and then enters an air floatation separator (3) for aeration air floatation solid-liquid separation, a water phase after the air floatation separation enters a filter for further filtration, and a water phase after the filtration enters a buffer tank (5) to adjust the pH value of the water phase to acidity;
(2) Removing hydrogen sulfide: removing hydrogen sulfide by adopting a cross-flow liquid membrane process;
a receiving phase solution is arranged in the receiving phase liquid tank (8), the receiving phase solution is a mixture of an extracting agent and a back-extracting agent, and the mixing volume ratio of the back-extracting agent to the extracting agent is (5-20): 1;
at room temperature, the receiving phase solution in the receiving phase liquid tank (8) is pumped into the shell side of the hollow fiber supported liquid membrane component (6), the hollow fiber supported liquid membrane bundle tube is soaked in the receiving phase solution, and an extracting agent in the receiving phase solution can be adsorbed in the gaps of the hydrophobic hollow fiber supported liquid membrane; pumping pretreated sulfur-containing produced water in a buffer tank (5) into a hollow fiber supported liquid membrane bundle tube in a tube pass of a hollow fiber supported liquid membrane component (6), complexing hydrogen sulfide molecules in the sulfur-containing produced water in the tube pass with an extracting agent in a receiving phase solution in a hollow fiber supported liquid membrane gap to form a complex, transferring mass to a shell pass by the hollow fiber supported liquid membrane, and then decomplexing the complex by the stripping agent in the receiving phase solution in the shell pass to realize stripping; after the extraction and back extraction processes are finished, the water phase flows into a water purifying tank (7) from a tube pass outlet (18) so as to remove hydrogen sulfide in the water; the receiving phase solution is refluxed from a shell side outlet (20) to a receiving phase liquid tank (8) to realize circulation of the receiving phase solution.
10. The method for removing hydrogen sulfide from sulfur-containing produced water in an oil and gas field according to claim 9, which is characterized in that:
the sulfide content of the sulfur-containing produced water is 5-700 mg/L;
the medicament comprises an inorganic flocculant, an organic flocculant and a first pH regulator;
the inorganic flocculant is polyaluminium chloride solution, and the dosage is 300-1000ppm;
the organic flocculant is polyacrylamide solution, and the dosage of the organic flocculant is 250-750 ppm;
the gas-water ratio of the air floatation separator (3) is 6-10;
the buffer tank (5) adjusts the pH value of the water phase to 6-7;
the extracting agent is a kerosene organic phase in which EDA is dissolved, wherein the content of EDA is 2% -5%;
the back extractant is NaOH aqueous solution, wherein the concentration of NaOH is 0.5-3.0 mol/L.
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