CN115142831B - Method for driving MVR to produce salt by utilizing residual brine pressure of salt cavern gas storage - Google Patents
Method for driving MVR to produce salt by utilizing residual brine pressure of salt cavern gas storage Download PDFInfo
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- CN115142831B CN115142831B CN202210719655.9A CN202210719655A CN115142831B CN 115142831 B CN115142831 B CN 115142831B CN 202210719655 A CN202210719655 A CN 202210719655A CN 115142831 B CN115142831 B CN 115142831B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 169
- 239000012267 brine Substances 0.000 title claims abstract description 73
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 title claims abstract description 73
- 238000003860 storage Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000002347 injection Methods 0.000 claims abstract description 68
- 239000007924 injection Substances 0.000 claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 238000005381 potential energy Methods 0.000 claims abstract description 11
- 238000001704 evaporation Methods 0.000 claims abstract description 7
- 230000008020 evaporation Effects 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 92
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 38
- 239000003345 natural gas Substances 0.000 claims description 19
- 239000003513 alkali Substances 0.000 claims description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 14
- 238000004146 energy storage Methods 0.000 claims description 13
- 239000013505 freshwater Substances 0.000 claims description 13
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 230000005611 electricity Effects 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 4
- 239000003570 air Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000010248 power generation Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 6
- 235000002639 sodium chloride Nutrition 0.000 description 122
- 238000004519 manufacturing process Methods 0.000 description 17
- 238000004090 dissolution Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 238000007731 hot pressing Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 235000019994 cava Nutrition 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004401 flow injection analysis Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/285—Melting minerals, e.g. sulfur
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/008—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being a fluid transmission link
Abstract
A method for driving MVR to produce salt by utilizing residual brine pressure of salt cavern gas storage comprises the following steps: (1) selecting a volume of salt cavern space; (2) establishing a connection channel between the ground and the underground salt cavern space; (3) Injecting a certain volume of gas into the underground salt cavern space through an injection channel by utilizing a gas compressor; (4) In the electric energy surplus time period, the electric water injection equipment is utilized to inject liquid into the underground salt cavern space through the injection channel; (5) After entering the underground salt cavern space, the liquid is converted into brine, and gas in the salt cavern is compressed to convert electric energy into gas potential energy; (6) Controlling a discharge channel of the underground salt pit space, and continuously and stably discharging brine in the underground salt pit space by compressed gas and entering a water turbine; (7) The water turbine is used as a power source of the MVR salt making compressor, and finally MVR evaporation salt making is realized.
Description
Technical Field
The invention relates to a method for driving MVR to produce salt by utilizing residual brine pressure of a salt cavern gas storage.
Background
Energy storage refers to the process of storing energy through a medium or a device and releasing the energy when needed, and generally refers to electric energy storage.
In China, salt caverns are rich in resources, and the salt caverns are used as gas storage and oil storage spaces to be utilized more and more widely. For example, CN110593917a discloses a method for quickly constructing a horizontal type super-large salt cavern solution cavity reservoir, specifically, through multi-well communication, the multi-salt cavern solution cavity solution through series combination, multi-well combination large-flow water injection and multi-well group injection and discharge combination control cavity shape, so as to realize quick construction of the super-large salt cavern solution cavity reservoir. The invention can realize rapid cavity-building and capacity-expanding of large-flow injection and drainage, achieves the aim of manually controlling cavity dissolution and cavity development form by adjusting different injection and drainage combination modes of well groups, realizes rapid construction of oversized salt cavern dissolution cavity storage in layered rock salt, and has the characteristics of short cavity-building period, large dissolution cavity volume, capability of manual intervention in the cavity development process, high rock salt recovery rate and the like.
CN109751022a discloses a gas injection and production method for communicating a well salt cavern gas storage, which comprises the following steps: dividing a communication well communicated with a salt cavern gas storage into: an injection and production well and an injection and drainage brine well; when gas is injected into the gas storage, natural gas is injected into the gas storage through the gas injection and production well, the natural gas drives brine from top to bottom, and brine in the gas storage is discharged through the brine injection and discharge well; when the gas storage is used for gas production, brine is injected into the gas storage through the brine injection and drainage well, the brine drives natural gas from bottom to top, and the natural gas in the gas storage is produced through the gas injection and production well; when the gas storage is neither filled with gas nor used for gas production, a certain amount of natural gas is reserved in the gas storage, fresh water or light brine is filled into the gas storage through the gas injection and production well, brine is formed after the fresh water or the light brine dissolves rock salt, and the brine is discharged from the brine injection and discharge well. The invention solves the problems of easy reduction of the cavity volume of the salt cavern gas storage, large filling bottom gas ratio, long construction period and the like, and realizes the safe and efficient operation of the communicated well salt cavern gas storage.
The mechanical thermal compression salt Making (MVR) device is used for making salt by hot pressing, the hot pressing salt making process adopts a compressor which is a key device, usually a centrifugal compressor, the centrifugal compressor is generally driven by a steam turbine or a motor, and the steam turbine drives the centrifugal compressor to have the characteristics of adjustable rotating speed, easy load control, reasonable utilization of the device for self-production of steam and the like, and is widely applied to industrial production.
In the brine extraction process using fresh water, the extracted brine has kinetic energy, and no patent or related literature using the kinetic energy is reported at present.
Disclosure of Invention
The invention provides a method for driving MVR salt making by utilizing residual brine pressure of a salt cavern gas storage, which takes natural gas (or other dissolution-resistant gas such as nitrogen) in an underground salt cavern as an energy storage medium, takes brine as a power transmission medium for MVR salt making, does not need equipment such as a generator, a motor and the like, fully utilizes low-cost electric power resources in a surplus electric energy time period, injects water at high pressure for energy storage, utilizes the residual brine pressure discharged from the salt cavern to drive a water turbine, and takes the water turbine as a power source for MVR salt making. The inventor finds that the residual brine pressure after high-pressure water injection and energy storage is very suitable for driving a water turbine, thereby realizing the organic combination of brine extraction and salt or alkali preparation procedures.
The invention relates to a method for driving MVR to produce salt by utilizing residual brine pressure of a salt cavern gas storage, which comprises the following steps:
(1) Selecting a certain volume of salt cavity space, and optionally detecting the depth, volume and shape of the salt cavity space;
(2) Establishing a connection channel between the ground and an underground salt cavern space, comprising: an injection channel and a discharge channel;
(3) A certain volume of gas (natural gas or other dissolution-resistant gas such as nitrogen and the like) is injected into the underground salt cavern space through an injection channel by utilizing a gas compressor;
(4) In the electric energy surplus time period, using electric water injection equipment (such as a high-pressure water injection pump) to inject liquid (such as fresh water or light brine) into the underground salt cavern space through an injection channel;
(5) After entering the underground salt cavern space, the liquid is converted into brine, and gas in the salt cavern is compressed simultaneously, so that electric energy is converted into gas potential energy, and energy storage is realized;
(6) Controlling a discharge channel of the underground salt pit space, and continuously and stably discharging brine in the underground salt pit space by compressed gas and entering a water turbine;
(7) The water turbine is used as a power source of the MVR salt making compressor, and finally MVR evaporation salt making is realized.
Further, the method further comprises: brine discharged by the water turbine is used as brine of salt making or alkali making raw materials and is used for salt making or alkali making.
Further, in step (1), one or more of the depth, volume, and morphology of the underground high pressure storage space is detected, for example, the depth, volume, or morphology of the underground high pressure storage space is detected.
Further, in the step (1), the salt caves are underground storage spaces which meet the air-tight sealing requirement and have a certain volume, wherein the underground storage spaces are formed by connecting one space body or a plurality of space bodies in parallel, the space bodies are single independent space bodies or a group of communicated space bodies, the volume of the space bodies is generally equal to or more than 1 ten thousand m 3, such as 1-1000 ten thousand m 3, 10-200 ten thousand m 3 or 20-100 ten thousand m 3, and the depth range of the space bodies can be 100-5000m, such as 200-4000m, 300-3500m or 400-3200m, preferably 500-3000m. The salt caves are connected in parallel through pipelines on the ground;
Further, in the step (2), the connection channels between the ground and the salt cavern are two communication channels for injection and discharge respectively; alternatively, the injection and discharge may be a common connection passageway, which meets the air-tight requirements, and the underground access opening may be 1-30m, such as 2-25m, 3-20m, 3-18m, or 3-15m, preferably 3-10m, from the bottom of the underground space.
Further, in step (3), the gas injected into the salt cavern is a gas that does not interfere with the gas seal requirements of the subterranean space, is insoluble in liquids, does not corrode and damage equipment and the subterranean space, such as one or more of nitrogen, air, natural gas, or other gases.
Further, in step (3), if the salt cavern is a single independent space body, gas is stored in an upper portion of the space body; if the underground high pressure storage space is a set of interconnected volumes, then the gas is stored in the volume with the highest relative position.
Further, in step (3), during the gas injection into the salt cavern, the upper pressure of the subterranean space is preferably 30% to 60%, such as 35% to 55% or 40% to 50% or 42% to 48%, of the fracture pressure of the formation, based on not affecting the gas tightness of the formation. The fracture pressure of the formation is generally determined according to the result of the ground stress test, and is generally calculated by adopting a hydraulic fracturing method, namely, a section of the fracture is sealed in a vertical drilling hole of the formation, a tensile fracture is generated at a test layer position through small-volume high-pressure fluid injection, the fracture is expanded into the original formation, then the fluid injection is stopped, the fracture is closed along with the pressure drop, and the fracture pressure of the formation is calculated by analyzing a pressure drop curve.
Further, in step (4), the electric energy surplus time period includes: daily off-peak or flat periods, or peak periods of new energy generation (e.g., including one or both of wind energy, light energy), or other periods of power redundancy. The different time periods of each day are divided into a peak period, a flat period and a valley period according to the price of the electricity charge, the time period with high electricity price is defined as the peak period, the time period with middle electricity price is defined as the level period, the time period with low electricity price is defined as the valley period, and certain difference exists between specific time periods corresponding to the peak period, the flat period and the valley period of the electricity consumption of different countries or regions. For example, the peak usage period time may be 8:00-11:00 and 17:00-22:00; the flat peak time period may be 11:00-17:00 and 22:00-24:00, and the electricity consumption period may be 0:00-8:00.
Further, in step (4), during the injection of the liquid into the salt cavern, the pressure in the underground space will gradually rise, the upper pressure of which is based on the gas tightness of the stratum not being affected, preferably the upper pressure of which is 60% -90%, further 60% -85% or 65% -80% or 70% -75% of the fracture pressure of the stratum.
Further, in step (5), the liquid injected into the underground high-pressure storage space is first stored at the bottom of the underground space due to the difference in specific gravity; along with continuous injection of liquid, the gas-liquid interface is gradually raised, and the potential energy of gas is gradually increased, so that the electric energy is converted into the potential energy of gas.
Further, in step (6), brine enters the water inlet pipe of the water turbine, and brine enters the water turbine at a flow rate of 1000-5000m 3/h, typically 1-5 m/s. The operation of the water turbine generally needs 1000-5000m 3/h of flow and the inlet pressure is 1-5MPa; the mechanical thermal compression salt Making (MVR) device is used for making salt by hot pressing, the hot pressing salt making process adopts a compressor which is a key device, usually a centrifugal compressor, the centrifugal compressor is generally driven by a steam turbine or a motor, and the steam turbine drives the centrifugal compressor to have the characteristics of adjustable rotating speed, easy load control, reasonable utilization of the device for self-production of steam and the like, and is widely applied to industrial production.
Further, in step (6), after the discharge passage of the underground high-pressure storage space is opened, the gas in the underground space is gradually expanded, the gas-liquid interface is gradually lowered, and the liquid in the underground space is extruded out of the ground, enters the water turbine and drives the water turbine. During this process, the gas-liquid interface remains above the underground passageway of the discharge passageway at a distance of 1m or more, for example 1-10m or 2-8m or 3-6m or 3-5m from the passageway.
Further, brine discharged by the water turbine is used as brine for preparing salt or alkali raw materials, and the brine is used for preparing salt or alkali according to a known process.
In the present application, "optional" means that the subsequent step occurs or does not occur.
The invention has the following technical effects or advantages:
1. The patent uses natural gas (or other dissolution-resistant gas such as nitrogen) in the underground salt cavern as an energy storage medium, uses brine as a power transmission medium for MVR salt production, does not need equipment such as a generator, a motor and the like, and has small energy loss and high energy utilization rate.
2. The salt manufacturing device can be organically combined with the operation of the salt cavern gas storage, and realizes energy storage and MVR salt manufacturing when the natural gas is stored in the underground space, so that the efficient utilization of the salt cavern space is realized.
3. The low-valley electric quantity of the power grid is fully utilized, the peak period of electricity consumption is staggered, the contradiction between power supply and demand can be effectively alleviated, and the stable guarantee of power is facilitated.
Drawings
Fig. 1 is a schematic diagram of a brine residual pressure driven MVR salt manufacturing process of a salt cavern gas storage, and 2 salt caverns which are mutually communicated are taken as an example for illustration;
Fig. 2 is a schematic diagram of a brine residual pressure driven MVR salt manufacturing process for a single salt cavern gas storage.
Wherein, 1 is MVR salt making compressor, 2 is electric power water injection equipment, 3 is injection channel, 4 is gas, 5 is liquid, 6 is discharge channel, 7 is salt cavern space, 8 is hydraulic turbine, 9 is salt making or alkali making system, 10 gas compressor.
Detailed Description
For a further understanding of the present invention, reference is made to the following detailed description of the invention, taken in conjunction with the accompanying drawings and examples, which illustrate, but do not limit, the invention, it being understood that the description is made only for the purpose of further illustrating the features and advantages of the invention, and not the limitations of the claims of the invention. Any equivalent substitution in the art according to the present disclosure is within the scope of the present invention.
FIG. 1 is a schematic diagram of a brine residual pressure driven MVR salt manufacturing process of a salt cavern gas storage, wherein one or more groups of salt cavern spaces 7 are selected for detecting the depth, volume and shape of the salt cavern spaces; establishing a connecting channel between the ground and an underground salt cavern space, wherein the connecting channel comprises an injection channel 3 and a discharge channel 6; a certain volume of gas (natural gas or other dissolution-resistant gas such as nitrogen and the like) is injected into the salt cavern space 7 through the injection channel 3 by utilizing the gas compressor 10; in the electric energy surplus time period, liquid (such as fresh water or light brine) is injected into the salt cavern space 7 through the injection channel 3 by using the electric water injection equipment (such as a high-pressure water injection pump) 2; after entering the underground salt cavern space 7, the liquid is converted into brine, and gas in the salt cavern space is compressed at the same time, so that electric energy is converted into gas potential energy, and energy storage is realized; controlling a discharge channel 6 of an underground salt cavern space 7, and continuously and stably discharging brine in the underground salt cavern space to the ground by compressed gas and entering a water turbine 8; the water turbine 8 is used as a power source of the MVR salt making compressor 1 to finally realize MVR evaporation salt making; brine discharged by the water turbine 8 is used as raw material brine for salt making or alkali making, and the salt making or alkali making is carried out in a salt making or alkali making system 9.
FIG. 2 is a schematic diagram of a brine residual pressure driven MVR salt manufacturing process of a single salt cavern gas storage, wherein one or more independent salt cavern spaces are selected to detect the depth, volume and shape of the salt cavern spaces; establishing a connecting channel between the ground and an underground salt cavern space, wherein the connecting channel comprises an injection channel 3 and a discharge channel 6; a certain volume of gas (natural gas or other dissolution-resistant gas such as nitrogen and the like) is injected into the underground salt cavern space 7 through the injection channel 3 by utilizing the gas compressor 10; in the electric energy surplus time period, liquid (such as fresh water or light brine) is injected into the underground salt cavern space 7 through the injection channel 3 by using the electric water injection equipment (such as a high-pressure water injection pump) 2; after entering the underground salt cavern space 7, the liquid is converted into brine, and meanwhile, the gas in the salt cavern is compressed, so that the electric energy is converted into gas potential energy, and the energy storage is realized; controlling a discharge channel 6 of an underground salt cavern space 7, and continuously and stably discharging brine in the underground salt cavern space to the ground by compressed gas and entering a water turbine 8; the water turbine 8 is used as a power source of the MVR salt making compressor 1 to finally realize MVR evaporation salt making; brine discharged by the water turbine 8 is used as raw material brine for salt making or alkali making, and the salt making or alkali making is carried out in a salt making or alkali making system 9.
Example 1
(1) 8 Groups of communicating well salt cavern spaces are selected to detect the depth, volume and shape of salt caverns, the total volume of the salt cavern spaces is about 500 square, and the depth range is 1300-1600m;
(2) Establishing a connecting channel of the ground and the underground high-pressure storage space, wherein the connecting channel comprises an injection channel and a discharge channel; and (3) analyzing the ground stress test result to obtain that the fracture pressure of the stratum where the cavity is located is 29MPa, the upper limit pressure after gas injection of the cavity is selected to be 16.5MPa, and the upper limit pressure after liquid injection of the cavity is selected to be 23MPa.
(3) Injecting a certain volume of natural gas into the underground high-pressure storage space through an injection channel by utilizing a gas compressor, wherein the pressure of the injected gas reaches 16MPa;
(4) In the electric energy surplus time period, the fresh water is injected into the underground salt cavern through an injection channel by using electric water injection equipment (such as a high-pressure water injection pump), and the pressure of the injected water to the cavern rises to 18.6MPa;
(5) After entering the underground salt cavern, the fresh water is converted into brine, and meanwhile, the natural gas in the salt cavern is compressed, so that the electric energy is converted into gas potential energy, and the energy storage is realized;
(6) Controlling a discharge channel of an underground salt cavern, continuously and stably discharging brine in an underground salt cavern space to the ground by using compressed natural gas, and enabling the brine to enter a water inlet pipeline of a water turbine at a flow rate of about 3.0m/s and a flow rate of 2500m 3/h, wherein the inlet pressure of the water turbine is about 2.5MPa;
(7) The water turbine is used as a power source of the MVR salt making compressor, and finally MVR evaporation salt making is realized.
(8) Brine discharged by the water turbine is used as raw material brine for preparing salt, and enters a salt preparing process for preparing salt.
Example 2
(1) Selecting 15 single-well salt cavern spaces, and detecting the depth, volume and shape of salt caverns, wherein the total volume of the salt cavern spaces is about 375 square, and the depth range is 1200-1500m;
(2) Establishing a connecting channel of the ground and the underground high-pressure storage space, wherein the connecting channel comprises an injection channel and a discharge channel; and (3) analyzing the ground stress test result to obtain that the fracture pressure of the stratum where the cavity is located is 27MPa, the upper limit pressure after gas injection of the selected cavity is 15MPa, and the upper limit pressure after liquid injection of the cavity is 21.5MPa.
(3) Injecting a certain volume of natural gas into the underground high-pressure storage space through an injection channel by utilizing a gas compressor, wherein the pressure of the injected gas to the cavity reaches 14.8MPa;
(4) In the electric energy surplus time period, the dilute brine is injected into the underground salt cavern through an injection channel by using electric water injection equipment (such as a high-pressure water injection pump), and the pressure of the injected water to the cavern rises to 17MPa;
(5) The light brine enters the underground salt cavern and is converted into brine, and meanwhile, the natural gas in the salt cavern is compressed, so that the electric energy is converted into gas potential energy, and the energy storage is realized;
(6) Controlling a discharge channel of an underground salt cavern, continuously and stably discharging brine in an underground salt cavern space out of the ground by compressed natural gas, wherein the brine enters a water inlet pipeline of a water turbine at a flow rate of about 2.0m/s and a flow rate of 1500m 3/h, and the inlet pressure of the water turbine is about 2.3MPa;
(7) The water turbine is used as a power source of the MVR salt making compressor, and finally MVR evaporation salt making is realized.
(8) Brine discharged by the water turbine is used as raw material brine for preparing alkali and enters an alkali preparing process.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (15)
1. A method for driving MVR to produce salt by utilizing residual brine pressure of salt cavern gas storage comprises the following steps:
(1) Selecting a certain volume of underground salt cavern space, and detecting one or more of depth, volume and morphology of the underground salt cavern space;
(2) Establishing a connection channel between the ground and an underground salt cavern space, comprising: an injection channel and a discharge channel;
(3) Injecting a volume of gas into the underground salt cavern space via an injection passage using a gas compressor;
(4) In the electric energy surplus time period, the electric power water injection equipment is utilized to inject fresh water into the underground salt cavern space through the injection channel;
(5) After entering the underground salt cavern space, the fresh water is converted into brine, and gas in the underground salt cavern space is compressed simultaneously, so that electric energy is converted into gas potential energy, and energy storage is realized;
(6) Controlling a discharge channel of the underground salt cavern space, wherein compressed gas in the underground salt cavern space drives brine in the underground salt cavern space to continuously and stably discharge the brine out of the ground, and then the brine enters a water turbine;
(7) The water turbine is used as a power source of the MVR salt making compressor to finally realize MVR evaporation salt making,
The ground end of the injection channel is respectively connected with the electric water injection equipment and the gas compressor, the ground end of the discharge channel is connected with the water turbine, and the water turbine is further connected with the MVR salt making compressor.
2. The method according to claim 1, characterized in that the method further comprises: brine discharged by the water turbine is used as brine of salt making or alkali making raw materials and is used for salt making or alkali making.
3. The method of claim 1, wherein the electrical water injection device is a high pressure water injection pump.
4. A method according to any one of claims 1 to 3, wherein in step (1), the underground salt cavern space is an underground storage space which meets the air-tight requirement and has a certain volume, the underground storage space is a single independent space body or a group of mutually communicated space bodies, the volume of the underground salt cavern space is equal to or greater than 1 ten thousand m 3, and the depth range is 100-5000m.
5. The method of claim 4, wherein the volume of the underground salt cavern space is 10-1000 km 3 and the depth is in the range of 200-4000m.
6. A method according to any one of claims 1 to 3, wherein in step (2) the injection channel and the discharge channel are two communication channels for injection and discharge, respectively; or the injection channel and the discharge channel are a shared connecting channel; and/or
In the step (3), the gas injected into the underground salt cavern space is gas which does not influence the air sealing requirement of the underground salt cavern space, is insoluble in liquid and does not corrode and damage equipment and the underground salt cavern space, and the gas is nitrogen, air or natural gas; and/or
In step (3), if the underground salt cavern space is a single independent volume, then gas is stored in an upper portion of the volume; if the underground salt cavern space is a group of interconnected space bodies, then the gas is stored in the space body with the highest relative position.
7. A method according to any one of claims 1 to 3, wherein in step (3), the upper pressure in the underground salt cavern space is such that the gas tightness of the formation is not affected during the gas injection into the underground salt cavern space.
8. The method of claim 7, wherein the upper pressure limit of the subsurface salt cavern space is 30% -60% of the fracture pressure of the formation.
9. A method according to any one of claims 1-3, wherein in step (4), the power-free period comprises: daily electricity consumption valley period or flat period, or peak time period of new energy power generation, or other power surplus time period.
10. A method according to any one of claims 1-3, wherein in step (4) the pressure in the underground salt cavern space is gradually increased during the injection of fresh water into the underground salt cavern space, the upper pressure being such that the gas tightness of the formation is not affected.
11. The method of claim 10, wherein in step (4), the upper pressure of the subsurface salt cavern space is between 60% and 90% of the formation fracture pressure.
12. A method according to any one of claims 1 to 3, wherein in step (5), the fresh water injected into the underground salt cavern space is first stored at the bottom of the underground salt cavern space due to a difference in specific gravity; along with continuous injection of fresh water, the gas-liquid interface is gradually raised, and the potential energy of gas is gradually increased, so that the conversion of electric energy into gas potential energy is realized.
13. The method according to any one of claims 1-4, wherein in step (6) the brine enters the inlet conduit of the turbine, the brine enters the turbine at a flow rate of 1000-5000m 3/h and at a flow rate of 1-5 m/s; and/or
The water inlet flow of the water turbine is 1000-5000m 3/h, and the inlet pressure is 1-5MPa; and/or
In the step (6), after the discharge channel of the underground salt cavern space is opened, the gas in the underground salt cavern space is gradually expanded, the gas-liquid interface is gradually lowered, the brine in the underground salt cavern space is extruded out of the ground, enters the water turbine and drives the water turbine, and in the process, the gas-liquid interface is kept above the underground inlet and outlet of the discharge channel and is more than or equal to 1m away from the inlet and outlet.
14. The method of claim 13, wherein the gas-liquid interface is maintained above and 1-10m from the underground port of the discharge channel.
15. The method of claim 14, wherein the gas-liquid interface is maintained above and 3-5m from the underground port of the discharge channel.
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