Electrolytic bath and oil field station hydrogen combustion system and method

Abstract

The invention provides an electrolytic bath and an oil field station hydrogen combustion system and method. The anode of the electrolytic bath is made of nickel-based alloy, the cathode of the electrolytic bath is made of nickel-based alloy, the pH value of electrolyte of the electrolytic bath is 13-14, and the electrolyte comprises alkali and 30-50 mg / L of imidazoline-Schiff base-pyridine composite corrosion and scale inhibitor; the composite corrosion and scale inhibitor comprises 60-80% of imidazoline, 10-20% of Schiff base and 10-20% of pyridine; the nickel-based alloy metal comprises the following element components of 50%-60% of nickel, 10%-20% of chromium, 10%-20% of molybdenum and 10%-15% of iron. The oil field station hydrogen combustion system comprises an electrolytic hydrogen production unit, a pressure regulating unit and a hydrogen combustion unit. The electrolytic hydrogen production unit comprises the electrolytic bath, a hydrogen purification part and an electrolyte supply part; the electrolytic bath is connected with the hydrogen purification part and the electrolyte supply part; and the hydrogen purification part, the pressure regulating unit and the hydrogen combustion unit are sequentially communicated.

Description

Technical Field

[0001] The invention relates to an electrolyzer, an oilfield station hydrogen combustion system and a method. Background Art

[0002] At present, the main hydrogen production processes include byproduct hydrogen, hydrogen production from chemical raw materials, hydrogen production from fossil fuels, and hydrogen production from water electrolysis. Among them, hydrogen production from water electrolysis is the most environmentally friendly way to produce hydrogen. The existing water electrolysis hydrogen production process includes large-scale wind and solar power generation equipment, hydrogen production equipment, and hydrogen separation and purification equipment. The equipment is large in scale and occupies a large area.

[0003] The existing hydrogen combustion system based on water electrolysis hydrogen production (including water electrolysis hydrogen production equipment, storage equipment, hydrogen combustion equipment) directly used for oil field station combustion has the following problems:

[0004] 1. It is impossible to directly use oilfield produced water to produce hydrogen. Oilfield produced water is different from conventional water used for electrolytic hydrogen production. Its composition is complex, with high mineralization and high calcium and magnesium ion content. Common water electrolysis hydrogen production equipment has high requirements for raw water and cannot directly use oilfield produced water as raw material for electrolytic hydrogen production. When using oilfield produced water as raw material for electrolytic hydrogen production, additional water treatment equipment is usually required, which makes the equipment more complicated and less suitable for use in oilfield stations.

[0005] 2. Problems such as complex process flow, large equipment scale, wide area, high investment and regional restrictions.

[0006] 3. It is not suitable for the characteristics of large oil field production areas, dispersed geographical locations, and different requirements of various stations.

[0007] In summary, it is currently necessary to study hydrogen combustion process technology based on water electrolysis to produce hydrogen that is suitable for use in oil field stations, so as to meet the needs of directly electrolyzing hydrogen using oil field produced water as raw water in oil field stations, and to use the produced hydrogen to supply energy to oil field stations. Summary of the invention

[0008] The object of the present invention is to provide an electrolyzer that can directly produce hydrogen by electrolysis using oilfield produced water as raw water, and a small hydrogen combustion system and method that can directly produce hydrogen by electrolysis using oilfield produced water as raw water and then use the produced hydrogen to supply energy to oilfield stations, which is suitable for use in oilfield stations.

[0009] In order to achieve the above objectives, the present invention provides the following three technical solutions.

[0010] In a first aspect, the present invention provides an electrolytic cell, wherein the material of the anode of the electrolytic cell is a nickel-based alloy, the material of the cathode of the electrolytic cell is a nickel-based alloy, and the electrolyte of the electrolytic cell comprises an imidazoline-Schiff base-pyridine composite corrosion and scale inhibitor and an alkali;

[0011] Wherein, based on the volume of the electrolyte, the content of the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor is 30-50 mg / L; based on the total mass of the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor as 100%, the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor includes 60-80% of imidazoline, 10-20% of Schiff base, and 10-20% of pyridine;

[0012] Among them, the pH value of the electrolyte is 13-14;

[0013] The nickel-based alloy metal used as the material of the anode contains the following elemental components based on the total mass of the alloy metal as 100%: 50-60% nickel, 10-20% chromium, 10-20% molybdenum, and 10-15% iron (e.g., 56% nickel, 16% chromium, 16% molybdenum, and 12% iron);

[0014] Among them, the nickel-based alloy metal used as the cathode material contains the following elemental components based on the total mass of the alloy metal as 100%: 50-60% nickel, 10-20% chromium, 10-20% molybdenum, and 10-15% iron (56% nickel, 16% chromium, 16% molybdenum, and 12% iron).

[0015] The electrolyzer provided in the first aspect is an electrolyzer for producing hydrogen by electrolysis of produced water from oil fields, which can directly produce hydrogen by electrolysis using produced water from oil fields as raw water. By using cathodes and anodes made of specific materials in combination with specific types of electrolytes, hydrogen production by electrolysis of produced water from oil fields can be effectively achieved.

[0016] According to a preferred embodiment of the first aspect, the electrolytic cell includes a cell body and an anode, a cathode and an electrolyte arranged in the cell body, and the cell body is provided with an anode gas outlet, a cathode gas outlet and a raw water inlet; more preferably, the cell body is made of a polymer material or the cell body is coated with phenolic epoxy coating.

[0017] According to a preferred embodiment of the first aspect, a diaphragm is provided in the electrolytic cell, and the diaphragm is provided between the anode and the cathode.

[0018] According to a preferred embodiment of the first aspect, wherein the electrolyte comprises oilfield produced water;

[0019] Preferably, the mineralization of the produced water from the oil field is 1×10 4 -8×10 4 mg / L;

[0020] Preferably, based on the mass of the produced water from the oil field as 100%, the sodium ion concentration in the produced water from the oil field is 0.3×10 4 -3×10 4mg / L, potassium ion concentration is 0.3×10 4 -3×10 4 mg / L, magnesium ion concentration is 100-700 mg / L, calcium ion concentration is 50-500 mg / L, crude oil content is ≤5.0 mg / L, suspended solid content is ≤1.0 mg / L; more preferably, the median particle size of the suspended solids is ≤1.0 μm;

[0021] Preferably, the solvent of the electrolyte is oilfield produced water;

[0022] Preferably, based on the mass of the electrolyte being 100%, the mass concentration of the oilfield produced water is 70-80%;

[0023] For example, the electrolyte can be obtained by mixing a mixture of imidazoline-Schiff base-pyridine composite corrosion inhibitor and oilfield produced water with an alkaline solution; wherein the alkaline solution can be obtained by mixing an alkali with oilfield produced water.

[0024] In a second aspect, the present invention provides a hydrogen combustion system for an oilfield station, wherein the system comprises an electrolytic hydrogen production unit, a pressure regulating unit, and a hydrogen combustion unit;

[0025] The electrolytic hydrogen production unit comprises the electrolytic cell, a hydrogen purification unit, and an electrolyte supply unit provided in the first aspect; wherein the hydrogen purification unit is connected to the electrolytic cell, so that the hydrogen flow generated in the electrolytic cell is purified by the hydrogen purification unit to obtain high-purity hydrogen; the liquid outlet of the electrolyte supply unit is connected to the electrolytic cell, so that the electrolyte is supplied to the electrolytic cell;

[0026] The hydrogen outlet of the hydrogen purification unit is connected to the fuel inlet of the hydrogen combustion unit, and the hydrogen purified by the hydrogen purification unit is supplied to the hydrogen combustion unit;

[0027] The pressure regulating unit is arranged between the hydrogen purification unit and the hydrogen combustion unit to adjust the pressure of the hydrogen supplied to the hydrogen combustion unit to meet the intake combustion pressure requirement of the hydrogen combustion unit.

[0028] The oilfield station hydrogen combustion system provided by the present invention is a small oilfield station hydrogen combustion system suitable for use in oilfield stations. It can utilize oilfield produced water resources to prepare hydrogen, and utilize the prepared hydrogen to supply energy to the oilfield station. It has a simple process flow, small equipment quantity, small footprint, and low investment.

[0029] According to a preferred embodiment of the second aspect, the hydrogen purification unit includes a cooler, a gas-liquid separator and a scrubber connected in sequence, so that the hydrogen flow generated in the electrolyzer is first cooled by the cooler, then enters the gas-liquid separator for gas-liquid separation, and then enters the scrubber for scrubbing, and finally the purified high-purity hydrogen is discharged from the scrubber; in this preferred embodiment, the purity of the purified high-purity hydrogen discharged from the scrubber can reach 99.8%;

[0030] More preferably, the gas-liquid separator is provided with a liquid replenishing port, and the liquid outlet of the scrubber and / or the liquid outlet of the electrolyte supply unit are connected to the liquid replenishing port of the gas-liquid separator to replenish the liquid phase for the gas-liquid separator, so that when the liquid phase in the gas-liquid separator drops below the lower limit of the liquid phase level, the scrubber and / or the electrolyte supply unit can be used to replenish the liquid;

[0031] More preferably, the liquid outlet of the electrolyte supply unit is connected to the scrubber, so that when the liquid phase in the scrubber drops below the lower limit of the liquid phase level, the electrolyte supply unit can be used to replenish the liquid phase;

[0032] More preferably, the cooler is a swept fin tube air cooler, which uses ambient air outside the swept fin tube as a cooling medium to cool the high-temperature fluid in the swept fin tube;

[0033] More preferably, the liquid outlet of the gas-liquid separator is connected to the electrolytic cell, so that when the liquid phase (electrolyte) in the gas-liquid separator exceeds the upper limit of the liquid phase level, part of the liquid phase is returned to the electrolytic cell;

[0034] More preferably, the gas-liquid separator can withstand a certain pressure;

[0035] More preferably, the scrubber can withstand a certain pressure;

[0036] More preferably, the feed port of the scrubber is arranged at the top of the scrubber, and a feed pipe connected to the feed port of the scrubber and extending to below the upper limit of the liquid level in the scrubber is provided inside the scrubber; in this preferred embodiment, the gas discharged from the gas-liquid separator enters from the feed port at the top of the scrubber, enters into the liquid phase inside the scrubber along the feed pipe to wash away the residual misty alkali solution and water vapor, and the washed gas is discharged through the gas outlet of the scrubber.

[0037] According to a preferred embodiment of the second aspect, the electrolyte supply unit includes a water tank and an alkali tank in parallel, the liquid outlets of the water tank and the alkali tank are connected, the water tank is used to store a mixture of oilfield produced water and imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor, and the alkali tank is used to store an alkali solution; more preferably, based on the volume of the mixture of oilfield produced water and imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor, the content of the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor is 30-50 mg / L; more preferably, when the alkali is KOH, the mass concentration of the alkali is 20-30% based on the mass of the alkali solution as 100%. The size of the water tank can be adjusted according to the actual working conditions, for example, the size of the water tank is set to meet the amount of the mixture of oilfield produced water and imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor required for the normal operation of the electrolytic cell for 1 week. The size of the alkali tank can be adjusted according to the actual working conditions. For example, the size of the alkali tank is set to be able to store the amount of alkali solution required for the normal operation of the electrolytic cell for one week.

[0038] According to a preferred embodiment of the second aspect, a liquid replenishing pump is provided at the liquid outlet of the electrolyte supply part.

[0039] According to a preferred embodiment of the second aspect, the pressure regulating unit comprises a flow meter, a pressure regulating valve and a flame arrester which are connected in sequence.

[0040] According to a preferred embodiment of the second aspect, the hydrogen combustion unit includes a hydrogen combustion heating furnace, which is used to utilize the heat generated by burning hydrogen to heat the fluid transported to the oil field station (for example, the oil field produced fluid transported to the joint station, such as the high-temperature fluid transported to the injection well and the production well) to meet the energy demand.

[0041] According to a preferred embodiment of the second aspect, the oilfield station hydrogen combustion system further includes a wind-solar power generation unit, and the wind-solar power generation unit includes a wind turbine, a photovoltaic panel, and a wind-solar complementary control inverter;

[0042] The wind turbine and photovoltaic panel are respectively connected to the wind-solar hybrid control inverter, and the wind-solar hybrid control inverter is connected to the electrolyzer, so that the electricity generated by the wind turbine and photovoltaic panel is used to supply power to the electrolyzer through the wind-solar hybrid control inverter;

[0043] More preferably, the wind-solar power generation unit further includes a battery, which is connected to the wind-solar complementary control inverter, so that the surplus electricity generated by the wind turbine and photovoltaic panel that exceeds the electricity used by the electrolyzer is stored in the battery, and the electrolyzer is powered when the electricity generated by the wind turbine and photovoltaic panel is insufficient to supply the electricity used by the electrolyzer;

[0044] This preferred technical solution fully integrates the wind, light and produced water resources of the oilfield station to prepare hydrogen and thus supply energy for the oilfield station. It fully integrates the wind, light and produced water resources of the oilfield station to realize the function of the oilfield station, helps to achieve energy conservation and consumption reduction, reduce carbon emissions and provide stable and continuous energy.

[0045] According to a preferred embodiment of the second aspect, the oilfield station hydrogen combustion system further includes a pressurized storage unit, which is arranged between the hydrogen purification unit and the pressure regulating unit, and the inlet of the pressurized storage unit is connected to the hydrogen outlet of the hydrogen purification unit, and the outlet of the pressurized storage unit is connected to the inlet of the pressure regulating unit; the pressurized storage unit is used to pressurize and store the hydrogen produced by the electrolytic hydrogen production unit;

[0046] More preferably, the pressurized storage unit comprises a hydrogen storage tank;

[0047] More preferably, the pressurized storage unit comprises a hydrogen compressor and a hydrogen storage tank connected in sequence.

[0048] According to a preferred embodiment of the second aspect, the oilfield station hydrogen combustion system includes a wind and solar power generation unit and a pressurized storage unit;

[0049] The storage capacity of the boost storage unit can be used to optimize the storage equipment of the wind and solar power generation units; different hydrogen storage tank capacities and battery storage capacities can be selected according to the energy load of different oil field stations.

[0050] In a third aspect, the present invention provides a method for burning hydrogen at an oilfield station, wherein the method is performed using the oilfield station burning hydrogen system provided in the second aspect, and the method comprises:

[0051] Using oilfield produced water to prepare electrolyte for electrolytic cells;

[0052] transporting the electrolyte to an electrolyzer for electrolytic hydrogen production;

[0053] The hydrogen gas purification unit is used to purify the hydrogen gas flow generated by the electrolyzer to obtain high-purity hydrogen gas that can be used for combustion;

[0054] High-purity hydrogen is transported to the hydrogen combustion unit for combustion, and the heat generated by the combustion is used to heat the fluid transported to the oil field station (such as oil field produced fluid transported to the joint station, such as high-temperature fluid transported to the injection well and production well).

[0055] The method provided in the third aspect of the present invention is a method suitable for carrying out combustion energy supply in oil field stations.

[0056] According to a preferred embodiment of the third aspect, the step of using oilfield produced water to prepare an electrolyte for use in an electrolytic cell comprises:

[0057] The produced water from the oil field is mixed with a mixed solution of an imidazoline-Schiff base-pyridine composite corrosion and scale inhibitor and an alkaline solution in real time;

[0058] Preferably, based on the volume of the mixed solution of the oilfield produced water and the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor, the content of the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor is 30-50 mg / L;

[0059] Preferably, when the alkali is KOH, the mass concentration of the alkali is 20%-30% based on the mass of the alkali solution being 100%;

[0060] In this preferred embodiment, the mixture of oilfield produced water, imidazoline-Schiff base-pyridine composite corrosion and scale inhibitor and alkaline solution can be mixed at a certain speed to obtain an electrolyte that meets the requirements.

[0061] According to a preferred implementation of the third aspect, the method further includes: generating electricity using a wind turbine and a photovoltaic panel, and controlling an inverter through wind-solar complementary power generation to supply power to the electrolytic cell for electrolysis.

[0062] According to a preferred embodiment of the third aspect, the method further comprises: utilizing a pressurized storage unit to perform pressurized storage on the high-purity hydrogen produced by the hydrogen purification unit.

[0063] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0064] 1. The electrolyzer provided by the present invention can directly electrolyze and produce hydrogen using oilfield produced water as raw water, and the electrolysis efficiency reaches more than 80%.

[0065] 2. The oilfield station hydrogen combustion system provided by the present invention realizes the preparation of clean energy hydrogen that can replace fossil fuels based on oilfield produced water resources, and then uses the prepared hydrogen as a raw material to realize the heat supply of the oilfield station, which helps to achieve energy conservation and consumption reduction, reduce carbon emissions and provide stable and continuous energy, while alleviating the working pressure of the oilfield produced water treatment system, and can obtain excellent social and economic benefits in oilfield production.

[0066] 3. The oilfield station hydrogen combustion system provided by the present invention is a system that integrates the production, storage and use of hydrogen and is suitable for oilfield stations. It has a simple process flow, small equipment volume, small footprint and low investment, which is in line with the actual limited footprint of land oilfield stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 A schematic structural diagram of an oilfield station hydrogen combustion system provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0069] Example 1

[0070] This embodiment provides an electrolytic cell.

[0071] The electrolytic cell provided in this embodiment includes a cell body and an anode, a cathode and an electrolyte arranged in the cell body;

[0072] The tank body is provided with an anode gas outlet, a cathode gas outlet, a raw water inlet and an electrolyte inlet;

[0073] The material of the anode of the electrolytic cell is a nickel-based alloy, which contains the following elemental components based on the total mass of the alloy metal as 100%: 56% nickel, 16% chromium, 16% molybdenum, and 12% iron;

[0074] The cathode material of the electrolytic cell is a nickel-based alloy, which contains the following elemental components based on the total mass of the alloy metal as 100%: 56% nickel, 16% chromium, 16% molybdenum, and 12% iron;

[0075] The electrolyte of the electrolytic cell contains an imidazoline-Schiff base-pyridine composite corrosion inhibitor and an alkali; wherein, based on the volume of the electrolyte, the content of the imidazoline-Schiff base-pyridine composite corrosion inhibitor is controlled at 30-50 mg / L; based on the total mass of the imidazoline-Schiff base-pyridine composite corrosion inhibitor as 100%, the imidazoline-Schiff base-pyridine composite corrosion inhibitor includes 60-80% of imidazoline, 10-20% of Schiff base, and 10-20% of pyridine; wherein the pH value of the electrolyte is 13-14.

[0076] Wherein, the tank body is coated with phenolic epoxy paint.

[0077] Wherein, a diaphragm is arranged in the electrolytic cell, and the diaphragm is arranged between the anode and the cathode.

[0078] The base is potassium hydroxide (KOH).

[0079] Wherein, based on the mass of the electrolyte being 100%, the electrolyte comprises oilfield produced water with a mass concentration of 70-80%;

[0080] The mineralization of the produced water from the oil field is 1×10 4 -8×10 4mg / L; Taking the mass of oilfield produced water as 100%, the sodium ion concentration in the oilfield produced water is 0.3×10 4 -3×10 4 mg / L, potassium ion concentration is 0.3×10 4 -3×10 4 mg / L, magnesium ion concentration is 100-700mg / L, calcium ion concentration is 50-500mg / L, crude oil content is ≤5.0mg / L, suspended solids content is ≤1.0mg / L; the median particle size of suspended solids is ≤1.0μm.

[0081] Example 2

[0082] This embodiment provides a hydrogen combustion system for an oil field station.

[0083] like Figure 1 As shown, the oilfield station hydrogen combustion system provided in this embodiment includes a wind-solar power generation unit 1, an electrolytic hydrogen production unit 2, a pressurized storage unit 3, a pressure regulating unit 4 and a hydrogen combustion unit 5 which are connected in sequence.

[0084] The electrolytic hydrogen production unit 2 includes an electrolytic cell, a hydrogen purification unit, and an electrolyte supply unit. The electrolytic cell is the electrolytic cell provided in Example 1. The hydrogen purification unit is connected to the electrolytic cell, so that the hydrogen flow generated in the electrolytic cell is purified by the hydrogen purification unit to obtain high-purity hydrogen; the first liquid outlet of the electrolyte supply unit is connected to the electrolytic cell, so that the electrolyte is supplied to the electrolytic cell.

[0085] The electrolyte supply unit includes a water tank and an alkali tank connected in parallel, and the liquid outlets of the water tank and the alkali tank are connected. The water tank is used to store a mixture of oilfield produced water and imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor, and the alkali tank is used to store an alkali solution (obtained by mixing the alkali with the oilfield produced water). Based on the volume of the mixture of the oilfield produced water and the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor, the content of the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor is 30-50 mg / L. The alkali is KOH, and the mass concentration of the alkali is 20-30% based on the mass of the alkali solution as 100%.

[0086] The size of the water tank is adjusted according to the actual working conditions, and the size of the water tank is set to meet the amount of oilfield produced water and imidazoline-Schiff base-pyridine composite corrosion and scale inhibitor required for the normal operation of the storage electrolyzer for one week. The size of the alkali tank is adjusted according to the actual working conditions, and the size of the alkali tank is set to meet the amount of alkali solution required for the normal operation of the storage electrolyzer for one week.

[0087] Among them, the hydrogen purification unit includes a cooler, a gas-liquid separator and a scrubber connected in sequence, so that the hydrogen flow generated in the electrolyzer is first cooled by the cooler, then enters the gas-liquid separator for gas-liquid separation, and then enters the scrubber for washing, and finally the purified high-purity hydrogen is discharged by the scrubber. The gas-liquid separator is provided with a liquid replenishing port, and the liquid outlet of the scrubber is connected to the liquid replenishing port of the gas-liquid separator to replenish the liquid phase for the gas-liquid separator, so that when the liquid phase in the gas-liquid separator drops below the lower limit of the liquid phase level, the scrubber can be used to replenish the liquid. The second liquid outlet of the electrolyte supply unit is connected to the scrubber, so that when the liquid phase in the scrubber drops below the lower limit of the liquid phase level, the electrolyte supply unit can be used to replenish the liquid phase. The liquid outlet of the gas-liquid separator is connected to the electrolyzer, so that when the liquid phase (electrolyte) in the gas-liquid separator exceeds the upper limit of the liquid phase level, part of the liquid phase is returned to the electrolyzer.

[0088] Among them, the feed port of the scrubber is arranged at the top of the scrubber, and a feed pipe connected to the feed port of the scrubber and extending to below the upper limit of the liquid level in the scrubber is arranged inside the scrubber. The gas discharged from the gas-liquid separator enters from the feed port at the top of the scrubber, enters into the liquid phase inside the scrubber along the feed pipe to wash away the residual misty alkali solution and water vapor, and the washed gas is discharged through the gas outlet of the scrubber.

[0089] The first liquid outlet of the electrolyte supply unit is provided with a first liquid replenishing pump, and the second liquid outlet of the electrolyte supply unit is provided with a second liquid replenishing pump.

[0090] Among them, the cooler uses a swept fin tube air cooler.

[0091] Among them, the gas-liquid separator can withstand a certain pressure, and the scrubber can withstand a certain pressure.

[0092] Among them, the wind-solar power generation unit 1 includes a wind turbine, a photovoltaic panel, a wind-solar complementary control inverter and a battery; the wind turbine and the photovoltaic panel are respectively connected to the wind-solar complementary control inverter, and the wind-solar complementary control inverter is connected to the electrolyzer, so that the electricity generated by the wind turbine and the photovoltaic panel is used to power the electrolyzer through the wind-solar complementary control inverter; the battery is connected to the wind-solar complementary control inverter, so that the surplus electricity generated by the wind turbine and the photovoltaic panel that exceeds the electricity used by the electrolyzer is stored in the battery, and the electrolyzer is powered when the electricity generated by the wind turbine and the photovoltaic panel is insufficient to supply the electricity used by the electrolyzer.

[0093] The inlet of the pressurized storage unit 3 is connected to the hydrogen outlet of the hydrogen purification unit, and is used for pressurizing and storing the hydrogen produced by the electrolytic hydrogen production unit.

[0094] The boost storage unit includes a hydrogen compressor and a hydrogen storage tank connected in sequence. The storage capacity of the boost storage unit is used to optimize the power storage equipment of the wind and solar power generation unit; different hydrogen storage tank capacities and battery storage capacities are selected according to the energy load of different oil field stations.

[0095] Among them, the inlet of the pressure regulating unit 4 is connected to the outlet of the boost storage unit 3, and the outlet of the pressure regulating unit 4 is connected to the fuel inlet of the hydrogen combustion unit 5, so as to adjust the pressure of the hydrogen supplied to the hydrogen combustion unit 5 to meet the intake combustion pressure requirement of the hydrogen combustion unit 5.

[0096] The pressure regulating unit 4 includes a flow meter, a pressure regulating valve and a flame arrester which are connected in sequence.

[0097] Among them, the hydrogen combustion unit 5 includes a hydrogen combustion heating furnace, which is used to utilize the heat generated by burning hydrogen to heat the fluid transported to the oil field station (for example, the oil field produced fluid transported to the joint station, such as the high-temperature fluid transported to the injection well and the production well) to meet the energy demand.

[0098] Example 3

[0099] This embodiment provides a hydrogen combustion method for an oil field station.

[0100] The method is carried out using the oil field station hydrogen combustion system provided in Example 2, and the method comprises:

[0101] Step S1: using oilfield produced water to prepare an electrolyte for use in the electrolytic cell provided in Example 1;

[0102] Step S2: transporting the electrolyte to the electrolytic cell provided in Example 1 to perform electrolysis to produce hydrogen;

[0103] Step S3: using a hydrogen purification unit to purify the hydrogen flow generated by the electrolyzer to obtain high-purity hydrogen that can be used for combustion;

[0104] Step S4: High-purity hydrogen is transported to the hydrogen combustion unit for combustion, and the heat generated by the combustion is used to heat the fluid transported to the oil field station (such as oil field produced fluid transported to the joint station, such as high-temperature fluid transported to the injection well and the production well).

[0105] Wherein, step S1 comprises:

[0106] The produced water from the oil field stored in the water tank and the mixed solution of the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor are mixed in real time with the alkaline solution stored in the alkali tank at a certain speed to obtain the electrolyte used in the electrolytic cell provided in Example 1.

[0107] Wherein, the oil field station hydrogen combustion method also includes:

[0108] Use wind turbines and photovoltaic panels to generate electricity, and use wind-solar hybrid control inverters to power electrolysis in electrolyzers;

[0109] The excess electricity generated by the wind turbine and photovoltaic panels that exceeds the electricity used by the electrolyzer is stored in a battery, and the battery is used to power the electrolyzer when the electricity generated by the wind turbine and photovoltaic panels is insufficient to supply the electrolyzer.

[0110] Wherein, the oil field station hydrogen combustion method also includes:

[0111] The pressurized storage unit is used to store the high-purity hydrogen produced by the hydrogen purification unit.

[0112] In a specific application, the electrolyte is obtained by mixing oilfield produced water with a mixture of imidazoline-Schiff base-pyridine composite corrosion and scale inhibitor and an alkaline solution; wherein the volume of the oilfield produced water is 1m 3 The content of imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor in the mixed solution of oilfield produced water and imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor is 30-50 mg / L, the mass concentration of KOH in the alkaline solution is 30%, and the pH value of the obtained electrolyte is 13. Using this electrolyte for electrolysis to produce hydrogen can produce 1m 3 Hydrogen and 0.5m 3 Oxygen, power consumption 4kW·h. Among them, the hydrogen produced by the electrolyzer is cooled by the cooler and then enters the gas-liquid separator for gas-liquid separation. The separated hydrogen enters the scrubber and is washed with water to obtain hydrogen with a purity of 99.8%. The hydrogen is adjusted to 0.1MPa by the pressure regulating unit and then enters the hydrogen-burning heater for combustion, providing energy and heat for the oil field station. When there are sufficient wind and solar resources, the excess hydrogen is pressurized to 2.5MPa and transported to the hydrogen storage tank for storage. When there are insufficient wind and solar resources, the hydrogen in the hydrogen storage tank is supplied to the hydrogen-burning heater for combustion.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electrolytic cell, wherein: The material of the anode of the electrolytic cell is a nickel-based alloy, the material of the cathode of the electrolytic cell is a nickel-based alloy, and the electrolyte of the electrolytic cell contains an imidazoline-Schiff base-pyridine composite corrosion and scale inhibitor and an alkali; Wherein, based on the volume of the electrolyte, the content of the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor is 30-50 mg / L; based on the total mass of the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor as 100%, the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor includes 60-80% of imidazoline, 10-20% of Schiff base, and 10-20% of pyridine; Among them, the pH value of the electrolyte is 13-14; The nickel-based alloy metal used as the material of the anode contains the following element components based on the total mass of the alloy metal as 100%: 50-60% nickel, 10-20% chromium, 10-20% molybdenum, and 10-15% iron; The nickel-based alloy metal used as the cathode material contains the following element components based on the total mass of the alloy metal as 100%: 50-60% nickel, 10-20% chromium, 10-20% molybdenum, and 10-15% iron.

2. The electrolytic cell according to claim 1, wherein The electrolyte contains oilfield produced water. Taking the mass of the electrolyte as 100%, the mass concentration of the oilfield produced water is 70-80%.

3. The electrolytic cell according to claim 2, wherein: The mineralization of the produced water in the oil field is 1×10 4 -8×10 4 mg / L; Preferably, based on the mass of the produced water from the oil field as 100%, the sodium ion concentration in the produced water from the oil field is 0.3×10 4 -3×10 4 mg / L, potassium ion concentration is 0.3×10 4 -3×10 4 mg / L, magnesium ion concentration is 100-700mg / L, calcium ion concentration is 50-500mg / L, crude oil content ≤5.0mg / L, suspended solid content ≤1.0mg / L; More preferably, the median particle size of the suspended solids is ≤ 1.0 μm.

4. A hydrogen combustion system for an oil field station, wherein: The system includes an electrolytic hydrogen production unit, a pressure regulating unit, and a hydrogen combustion unit; The electrolytic hydrogen production unit comprises an electrolytic cell, a hydrogen purification unit, and an electrolyte supply unit according to any one of claims 1 to 3; the hydrogen purification unit is connected to the electrolytic cell; the liquid outlet of the electrolyte supply unit is connected to the electrolytic cell to supply electrolyte to the electrolytic cell; The hydrogen outlet of the hydrogen purification unit is connected to the fuel inlet of the hydrogen combustion unit, and the hydrogen purified by the hydrogen purification unit is supplied to the hydrogen combustion unit; The pressure regulating unit is disposed between the hydrogen purification unit and the hydrogen combustion unit, and is used for regulating the pressure of the hydrogen supplied to the hydrogen combustion unit.

5. The oil field station hydrogen combustion system according to claim 4, wherein: The hydrogen purification unit includes a cooler, a gas-liquid separator and a scrubber which are connected in sequence.

6. The oil field station hydrogen combustion system according to claim 5, wherein: The gas-liquid separator is provided with a liquid replenishing port, and the liquid outlet of the scrubber and / or the liquid outlet of the electrolyte supply unit are connected to the liquid replenishing port of the gas-liquid separator; The liquid outlet of the electrolyte supply unit is connected to the scrubber; The liquid outlet of the gas-liquid separator is connected to the electrolytic cell.

7. The oil field station hydrogen combustion system according to claim 4, wherein: The electrolyte supply unit includes a water tank and an alkali tank connected in parallel, and the liquid outlets of the water tank and the alkali tank are connected. The water tank is used to store a mixture of oilfield produced water and imidazoline-Schiff base-pyridine composite corrosion and scale inhibitor, and the alkali tank is used to store an alkali solution.

8. The oil field station hydrogen combustion system according to claim 4, wherein: in, The pressure regulating unit comprises a flow meter, a pressure regulating valve and a flame arrester connected in sequence; The hydrogen burning unit comprises a hydrogen burning heating furnace, which is used to heat the fluid transported to the oil field station by utilizing the heat generated by burning hydrogen.

9. The oil field station hydrogen combustion system according to claim 4, wherein: The oilfield station hydrogen combustion system further includes a wind-solar power generation unit, which includes a wind turbine, a photovoltaic panel, and a wind-solar complementary control inverter; the wind turbine and the photovoltaic panel are respectively connected to the wind-solar complementary control inverter, and the wind-solar complementary control inverter is connected to the electrolyzer, so that the electricity generated by the wind turbine and the photovoltaic panel is used to power the electrolyzer through the wind-solar complementary control inverter.

10. The oil field station hydrogen combustion system according to claim 9, wherein: The wind-solar power generation unit also includes a battery, which is connected to the wind-solar complementary control inverter.

11. The oil field station hydrogen combustion system according to claim 10, wherein: The oilfield station hydrogen combustion system further includes a pressurized storage unit, which is arranged between the hydrogen purification unit and the pressure regulating unit. The inlet of the pressurized storage unit is connected to the hydrogen outlet of the hydrogen purification unit, and the outlet of the pressurized storage unit is connected to the inlet of the pressure regulating unit; the pressurized storage unit is used to pressurize and store the hydrogen produced by the electrolytic hydrogen production unit.

12. A method for burning hydrogen at an oil field station, wherein: The method is carried out using the oil field station hydrogen combustion system according to any one of claims 4 to 11, and the method comprises: Using oilfield produced water to prepare electrolyte for electrolytic cells; transporting the electrolyte to an electrolyzer for electrolytic hydrogen production; The hydrogen gas purification unit is used to purify the hydrogen gas flow generated by the electrolyzer to obtain high-purity hydrogen gas that can be used for combustion; High-purity hydrogen is transported to the hydrogen combustion unit for combustion, and the heat generated by the combustion is used to heat the fluid transported to the oil field station.

13. The method according to claim 12, wherein: The step of using oilfield produced water to prepare the electrolyte used in the electrolytic cell comprises: The produced water from the oil field is mixed with a mixed solution of an imidazoline-Schiff base-pyridine composite corrosion and scale inhibitor and an alkaline solution in real time; Preferably, based on the volume of the mixed solution of the oilfield produced water and the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor, the content of the imidazoline-Schiff base-pyridine composite corrosion inhibitor and scale inhibitor is 30-50 mg / L; Preferably, when the alkali is KOH, based on the mass of the alkali solution being 100%, the mass concentration of the alkali is 20%-30%.

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