718 results about "Saline water" patented technology

The invention relates to a saline intrusion measurement method, system and equipment based on dynamic ship motion conditions and a medium, and aims to solve the technical problem that the salinity inversion precision is reduced due to spatial-temporal dislocation between particle image velocity measurement flow field data and plane laser-induced fluorescence concentration field data caused by ship six-degree-of-freedom motion. According to the method, future poses are predicted by collecting ship motion parameters and environment disturbance parameters, and space-time compensation parameters are generated in combination with a static calibration matrix; performing three-dimensional coordinate transformation and time synchronization on synchronously acquired original flow field and concentration field data by applying compensation parameters, and eliminating space-time deviation caused by ship movement; a three-dimensional salinity distribution field is calculated based on registration data fusion flow field diffusion characteristics and concentration field distribution; and meanwhile, the pose of the measuring equipment is dynamically adjusted through the closed-loop controller so as to optimize the data acquisition quality. According to the method, ship motion interference is effectively inhibited, and accurate characterization of saline invasion frontal surface spatial characteristics is guaranteed.

The invention relates to the technical field of agricultural engineering and ecological environment protection, in particular to a saline-alkali soil desalination improvement system and method based on brackish water recycling. The system comprises a data collection module which collects soil salinity data, meteorological data and crop growth data of the saline-alkali land in real time; the data processing and analyzing module is used for receiving and preprocessing the soil salinity data, the meteorological data and the crop growth data of the saline-alkali land, constructing a soil salinity prediction model and outputting a soil salinity prediction result; the irrigation strategy decision module is used for generating an optimal irrigation strategy by adopting a reinforcement learning algorithm according to the soil salinity prediction result and the preprocessed crop growth data; and the irrigation control system is used for performing brackish water irrigation operation on the saline-alkali soil according to the optimal irrigation strategy. Precise regulation and control of saline-alkali soil salinity can be achieved, brackish water is adopted as irrigation water, water resources are saved to a certain degree, and therefore the improvement cost of saline-alkali soil is reduced.

The invention discloses a printing and dyeing wastewater zero-discharge treatment process based on low-pressure high-power membrane concentration and salt separation synergy. The wastewater is sequentially subjected to the steps of double-alkali softening pretreatment, organic pollutant treatment, forward osmosis low-pressure high-power concentration treatment, salt separation treatment and evaporative crystallization. Wherein the forward osmosis low-pressure high-power concentration treatment is performed in a partitioned manner along the flow direction, the osmotic pressure difference is gradually increased, the transmembrane pressure difference is gradually decreased, and interface electrochemical buffer and low-frequency gas-liquid disturbance can be set to inhibit concentration polarization and pollution. Carrying out nanofiltration and salt separation on the concentrated solution to obtain two paths of saline water mainly comprising Na2SO4 and NaCl, and respectively carrying out evaporative crystallization on the two paths of saline water; and refluxing and reusing the water produced by the draw solution. According to the process, high-power concentration and stable salt separation are realized under low mechanical pressure, the energy consumption is reduced, the water recovery rate and the crystal purity are improved, and zero discharge of wastewater is realized.

The invention provides a method for recovering Si, C and TiO2 based on chlorinated waste salt water quenching slag, which comprises the following steps: sequentially carrying out water quenching dissolution, precipitation separation and filter pressing dehydration treatment on chlorinated waste salt to obtain water quenching slag and supernate; adding a dilute acid solution into the water-quenched slag, dissolving, and adding a reducing agent for reaction to obtain slurry; carrying out solid-liquid separation on the slurry to obtain a solid material and filtrate; the filtrate is pumped into a boiling bed separator, the petroleum coke and TiO2 are intercepted by a medium material layer, clear liquid is discharged, then the medium material layer is subjected to backwashing regeneration, and the desorbed petroleum coke and TiO2 are subjected to graded enrichment by a hydrocyclone, so that petroleum coke slurry and TiO2 slurry are obtained. According to the method, TiO2, C and other resources in the water-quenched slag obtained after molten salt chlorination waste salt water quenching are recycled, and the technical problem that in the existing chlorination waste salt resourceful treatment process, Si, C, TiO2 and other resources in the water-quenched slag are wasted is solved.

The invention discloses a long-distance water-salt dynamic regulation and control method and device, a medium and a product, and relates to the technical field of ecological management, and the method comprises the steps: periodically obtaining monitoring data through a real-time monitoring network; determining the opening degree of a flow valve based on a partial pressure technology according to the water pressure and flow data of each node of the water delivery pipe network, and dynamically adjusting the water pressure and flow of each shunt branch in the water delivery pipe network according to the opening degree of the flow valve; according to the water content of the artificial soil layer, a water supplementing strategy is determined based on a vegetation water demand model; according to the salinity value of the artificial soil layer, on the basis of a salinity accumulation risk model, salt control closed-loop control based on a high salinity water active suction band-off mechanism is carried out; according to the invention, dynamic, accurate and closed-loop management of moisture and salinity can be realized.

The utility model discloses a central water treatment filtering device for desalted water production. A raw water inlet pipe of a reservoir is communicated with a water inlet pipeline of each filter; the ultrafiltration processors are connected in series; a water outlet of each filter is communicated with a water inlet pipeline of the first-stage ultrafiltration treater; a water outlet of the N-stage ultrafiltration treater is communicated with a water inlet pipeline of the filtered water storage tank; a water outlet of the filtered water storage tank is communicated with a water inlet pipeline of the primary reverse osmosis processor; all stages of reverse osmosis processors are connected in series, and water outlets of the N stages of reverse osmosis processors are communicated with a demineralized water storage tank pipeline. According to the device, the content of various pollutants in water entering the ultrafilter can be reduced, a filter element for ultrafiltration and reverse osmosis can be protected, the content of various impurity ions in the water after ultrafiltration is reduced, the conductivity of produced water is about 10 us / cm, the hardness is 0.01 mol / L or below, the produced water is used for supplementing water for a steelmaking and steel rolling heating furnace, and generated steam can be used for power generation of a steam turbine. Water consumption is reduced, resources are saved, and the accumulation speed of scale in the boiler is effectively reduced.

The utility model relates to a device for removing ammonia nitrogen in high-salinity wastewater. The device comprises a buffer tank, a raw material conveying pump, a raw material preheater, a concentration tower I, a concentration tower II and a concentration tower III which are connected in sequence, tower kettles of the concentration tower I, the concentration tower II and the concentration tower III are respectively connected with corresponding reboilers and tower kettle liquid delivery pumps, and tower tops of the concentration tower I, the concentration tower II and the concentration tower III are respectively connected with corresponding tower top liquid reflux tanks, tower top reflux pumps and tower top coolers; and the tower top liquid return tanks of the concentration tower II and the concentration tower III are respectively connected with corresponding deep coolers. According to the device, three-tower triple-effect differential pressure thermal coupling rectification is adopted, ammonia nitrogen in the high-salinity wastewater is effectively removed, all effective components are recycled, purified water at the top of each tower can be used for preparing 20 (wt)% of ammonia water, and concentrated liquid at the bottom of the tower can be used for refining saline water in the chlor-alkali chemical industry; the tower top steam of the concentration tower I can be used as a heat source of the concentration tower II, and the tower top steam of the concentration tower II can be used as a heat source of the concentration tower III, so that the steam consumption is greatly reduced.

The utility model provides an efficient desulfurization wastewater clarification device which comprises a clarification tank main body, and an upper heat exchanger, a heat exchange tube and a lower heat exchanger are sequentially arranged in an inner cavity of the clarification tank main body from top to bottom; the bottom of the heat exchange pipe is connected with a pipeline bracket, and clarification tank filler is arranged at the top of the heat exchange pipe; wherein the other end of the pipeline bracket is connected with the bottom of a sedimentation tank in the clarification tank main body; a sludge outlet is formed in the bottom of the sedimentation tank; the device can automatically clean and operate, is high in automation degree, and can specifically and efficiently precipitate desulfurization wastewater compared with a traditional precipitation tank; strong brine is used as a heat exchange medium for heat exchange, so that the temperature of the strong brine is increased, heat needed by temperature rise of the rear-end evaporation section is reduced, and the energy-saving effect is achieved.

A material calculator for a truck to deliver a predetermined quantity of brine per mile driven by the truck for a known route of miles independent of and proportional to truck speed, wherein the truck carries a known number of gallons of brine and a known number of pounds of salt. The material calculator has a processor accepting entry values of route miles to be driven, number of times the route of miles is to be driven, number of gallons of brine carried by the truck, and the number of pounds of salt carried by the truck. The processor has software for calculating dispensing of the brine and salt so that each is exhausted when the route is completed. A hydraulic pump pumps hydraulic fluid to a variable flow positive displacement pump to implement the calculated number of gallons of brine per mile to be dispensed for the known route.

The invention relates to the technical field of material performance testing, and discloses a multi-parameter simulation salt spray environment test system and method, and the system comprises a multi-parameter cooperative control module, a bionic fog drop generation and salt spray adjustment module, an energy recovery and resource circulation module, a salt spray environment adaptive compensation module, and a test data intelligent analysis module. The modules are in closed-loop communication through an industrial Ethernet; the method comprises the steps of test preparation, model initialization, dynamic simulation and compensation, energy resource circulation and data processing ending, specifically, a salt mist concentration-temperature-humidity-wind speed coupling model is constructed, uniform salt mist is generated through bionic atomization and electrostatic adsorption, self-adaptive compensation is achieved in combination with partition sensing and corrosion current detection, and the salt mist concentration-temperature-humidity-wind speed coupling model is obtained. And heat is recovered, and condensate water and non-atomized saline water are recycled. The problems of multi-parameter coupling interference, resource waste and low data value in the prior art are solved, the simulation precision and the resource utilization rate are improved, and the method is suitable for multi-field material corrosion resistance testing.

The utility model relates to the technical field of pickle production, and discloses a pickling device for pickle production, which comprises a pickling box, an end cover, a stirring mechanism, a saline water dispersing mechanism and a separation net, the top of the pickling box is provided with the stirring mechanism extending into the pickling box, and the separation net is fixed in the pickling box. A saline water storage cavity is formed in the portion, below the separation net, in the pickling box, one side of the pickling box is provided with a saline water dispersing mechanism communicated with the pickling box, the saline water dispersing mechanism comprises a conveying pump, a water inlet pipe, a main body pipe, an annular pipe, branch pipes and liquid outlet holes, and the inlet of the conveying pump is connected with the water inlet pipe extending into the saline water storage cavity; an outlet of the conveying pump is connected with a main body pipe, a plurality of annular pipes are mounted on the main body pipe, a plurality of branch pipes inserted into the pickling box are mounted on each annular pipe, and a plurality of liquid outlet holes are formed in the bottom of each branch pipe. According to the utility model, saline water gathered at the bottom is conveniently dispersed into all parts of the vegetables, so that the pickling is more uniform.

The utility model discloses a system for producing sodium carbonate by using carbon dioxide and carbide slag in boiler flue gas, which is characterized in that the boiler flue gas discharged by a coal-fired boiler is purified and then enters a carbonization tower instead of part of lime kiln gas to react with ammoniacal salt water to generate NaHCO3, the NaHCO3 is calcined to generate a final product sodium carbonate, carbon is fixed to the final product, and the emission of CO2 is reduced; and meanwhile, the consumption of CO2 generated by calcining the limestone is reduced, so that the consumption of the limestone and the coke is greatly reduced. Calcium carbide slag generated by a calcium carbide method PVC production device is ground and screened to obtain coarse powder, fine powder and superfine powder, the coarse powder, the fine powder and the superfine powder are mixed in proportion to obtain a calcium carbide slag powder mixture with reasonable grain size distribution, the mixture is used for preparing lime milk, lime milk meeting the ammonia distillation requirement of a sodium carbonate system can be prepared without adding quick lime, the lime milk is used for the ammonia distillation system, and the production cost is reduced. Lime milk notches caused by reduction of lime yield are supplemented, and meanwhile, the utilization value of the solid waste carbide slag is improved.

Method for softening produced oilfield brine for enhanced oil recovery, the method including dissolving gaseous carbon dioxide and a base in a produced oilfield brine that includes divalent ions to yield solid carbonates, filtering the solid carbonates to yield a softened water, and injecting the softened water into a subterranean formation.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a high-salinity wastewater nanofiltration and desalination integrated treatment method based on MBR. The invention aims to solve the problem of unstable high-salinity wastewater treatment effect of the existing MBR unit. The method comprises the following steps: introducing high-salinity wastewater into a hydraulic homogenizing unit, then introducing into a chemical softening unit, treating, and introducing into a biodegradation unit. The inlet water of the biodegradation unit comprises the outlet water of the chemical softening unit and the nanofiltration concentrated solution from the quality-divided recycling unit; and the effluent of the biodegradation unit is introduced into the chemical flocculation unit and then is introduced into the security filtration unit. And effluent of the security filtration unit enters the nanofiltration unit. Effluent of the nanofiltration unit comprises desalted water and nanofiltration stock solution, the desalted water is sent out of the treatment section, and the nanofiltration stock solution is introduced into the quality-divided recycling unit. The effluent of the quality-divided recycling unit comprises a nanofiltration concentrated solution and a nanofiltration waste solution, the nanofiltration waste solution is sent out of the treatment section, and the nanofiltration concentrated solution is introduced into the biodegradation unit.

The present application relates to the technical fields of iodine removal of crude salt, and discloses a high-efficiency and energy-saving iodine removal device for crude salt, which comprises a salt dissolving pool assembly, a reagent tank assembly, a reaction tank assembly, a combustion tank assembly and an adsorption tower assembly, mainly solves the problems of low iodine removal efficiency and high energy consumption in the prior art, by injecting fresh brine into the salt dissolving pool, driving the ultrapure water metering pump to dilute, opening the stirring motor to disturb and pre-oxidize the brine, driving the hydrochloric acid metering pump to adjust the pH of the brine, driving the water inlet pump to inject the brine into the reaction tank, adding hydrogen peroxide by the hydrogen peroxide metering pump, opening the ultrasonic vibrator and the aeration ring, and through the synergistic effect of cavitation and micro-bubble aeration, the oxidation reaction is strengthened, the oxygen generated by the reaction is transported to the combustion chamber to mix and burn with hydrogen, the heat energy generated by the combustion is converted into electricity by the thermoelectric generator to supply power to the ultrasonic vibrator, the ultrapure water in the cold liquid cavity absorbs the waste heat to warm up and preheat the salt dissolving, and after the oxidation reaction is completed, the brine is collected into the adsorption tower assembly for adsorption, so that the content of iodine in the crude salt is efficiently removed.

This invention discloses a test site and method for evaluating the geological storage capacity of carbon dioxide. The test site includes a brine pool and a brine layer and caprock structure located within the pool. The caprock structure is vertically positioned below the brine layer, and a brine reservoir structure is located below it. The brine reservoir structure is connected to a brine storage tank via a simulated extraction well pipe. The brine storage tank is connected to the brine layer via a simulated injection well pipe. Carbon dioxide is injected into the brine reservoir structure via a simulated gas injection well pipe. Pressure sensors installed on the inner wall of the brine pool monitor the pressure within the brine layer and the brine reservoir structure. The carbon dioxide injection rate, brine extraction rate, and brine injection rate are adjusted based on the monitored pressure to achieve pressure balance between the brine layer and the brine reservoir structure. This invention provides a test site for evaluating the geological storage capacity of carbon dioxide under actual site conditions.

The invention belongs to the technical field of biomass energy, and discloses an energy system based on biomass gasification, which is characterized in that biomass is converted into high-temperature synthesis gas flow by a gasification furnace, the high-temperature synthesis gas flow enters a carbon dioxide supercritical device to heat carbon dioxide fluid into supercritical fluid so as to drive power generation, and medium-high-temperature synthesis gas flow is formed; the medium-high-temperature synthesis gas flow enters the organic Rankine cycle device to heat and evaporate the organic fluid into high-enthalpy fluid to drive power generation and form medium-low-temperature synthesis gas flow, and the medium-low-temperature synthesis gas flow enters the seawater desalination device to evaporate and separate seawater into fresh water and saline water and form low-temperature synthesis gas flow; the methanol synthesis device captures hydrogen and carbon dioxide in the low-temperature synthesis gas flow and synthesizes methanol; electric energy and fresh water are obtained through stepped utilization of heat energy of synthesis gas flow, the energy utilization rate is greatly improved, hydrogen energy is obtained by capturing hydrogen in the synthesis gas flow, and carbon dioxide in the synthesis gas flow is further captured to synthesize methanol with the hydrogen.

The rapeseed oil hydration equipment comprises a hydration cylinder, a saline water adding mechanism and a residue filtering mechanism, the saline water adding mechanism is installed on the hydration cylinder, and the bottom of the hydration cylinder is in butt joint with the residue filtering mechanism; automatic hydration and impurity removal of the rapeseed oil can be conveniently realized without manual operation, so that the efficiency is improved, and meanwhile, the salinity is uniformly added.

The invention discloses a coal-to-methanol ash water treatment system and an optimization method. The coal-to-methanol ash water treatment system comprises a first water heater, a second water heater, a first flash evaporator, a third water heater and a vacuum flash evaporation device; an inlet of the first water heater is connected with a chilling chamber of the gasification furnace; an inlet of the second water heater is connected with a washing tower of a gasification section; an inlet of the first flash evaporator is connected with an air outlet of the first water heater and an air outlet of the second water heater; an inlet of the third water heater is connected with a liquid outlet of the first water heater and a liquid outlet of the second water heater; and the vacuum flash evaporation device is used for further treating liquid at the bottom of the third water heater. According to the method, the salt in the high-concentration brine can be recycled and converted into a product for resource recycling, so that the problem of hazardous waste treatment of crystalline solids in related technologies is solved, the treatment efficiency is improved, and the treatment cost is reduced.

To provide an energy recovery device capable of preventing malfunction due to a reduced flow rate of low-pressure brine during the filling process. [Solution] The system comprises first and second cylinder devices 9A and 9B connected to the concentrated water pipe 4 via first or second flow path switching mechanisms 6A and 6B, a control unit C that controls the flow and discharge of concentrated brine to these devices, a flow path direction regulating mechanism 11 that fills the first and second cylinder devices with low-pressure brine and returns the high-pressure brine that is pushed out to the membrane separator via a booster pump 10, and a first flow meter 18a connected to the concentrated water pipe that measures the flow rate of concentrated brine and transmits a first flow rate signal to the control unit, the control unit controlling the booster pump based on the first flow rate signal to adjust the flow rate of concentrated brine to the cylinder devices during the pumping process.

The invention provides a flexible adjusting system and method for coupling fused salt and a small pulverized coal bunker. The system comprises a boiler, a first pulverized coal bunker, the small pulverized coal bunker, a high-pressure cylinder, a cold re-steam pipeline and a fused salt circulating unit. The first pulverized coal bunker and the small pulverized coal bunker are both connected with the boiler and are used for conveying pulverized coal into the boiler; wherein the heat value of the pulverized coal in the small pulverized coal bunker is smaller than that of the pulverized coal in the first pulverized coal bunker; the output end of the high-pressure cylinder is connected with the boiler through the cold re-steam pipeline; the fused salt circulating unit comprises a low-temperature fused salt tank, a steam fused salt heater, a high-temperature fused salt tank and a saline water heat exchanger, and fused salt sequentially passes through the low-temperature fused salt tank, the steam fused salt heater, the high-temperature fused salt tank, the saline water heat exchanger and the low-temperature fused salt tank to circularly flow in the fused salt circulating unit. The method has the technical effects that the design is reasonable, the rapid load changing rate of the coal-fired unit can be increased, and the boiler side load response capacity can be improved.

The utility model discloses an LNG (Liquefied Natural Gas) cold energy saline water ice making device which comprises an LNG gasification system, a cold energy recovery system, an ice making and storing system and an ice unloading system, according to the LNG gasification system, LNG is gasified after exchanging heat with a refrigerant, and the refrigerant is cooled and enters the cold energy recovery system. In the cold energy recovery system, saline water exchanges heat with a low-temperature refrigerant and then is cooled to circularly supply cold to the ice-making and ice-storing system; according to the ice making and storing system, ice making water in an ice mold exchanges heat with low-temperature saline water in an ice making pool to be cooled to form ice blocks, the ice blocks are stored in the ice making pool when the ice does not need to be discharged, and integration of ice making and ice storage is achieved; according to the de-icing system, de-icing is carried out on an ice mold filled with ice blocks through a de-icing pool. According to the utility model, brine ice making is carried out through LNG cold energy, so that energy conservation and consumption reduction are realized, and the ice block quality is improved; the ice maker has the advantages of high automation degree, long service life, small occupied area, low investment cost, high cold energy utilization rate, high ice making efficiency and the like.

This invention discloses a controlled drainage ecological regulation method for synergistic irrigation and drainage to reduce salinity and alkalinity, belonging to the field of soil remediation technology. The method includes: a soaking and dissolving stage, where, with the drainage outlet closed, low-flow irrigation is performed at the farthest point from the drainage ditch, allowing a large amount of irrigation water to enter the small pores of the soil profile and soak and dissolve salts; a diffusion and dispersion stage, where the drainage outlet is raised, and with the outlet height lower than the field surface, large-flow irrigation is performed evenly, filling all pores of the soil profile with irrigation water and enhancing the diffusion and dispersion of salts; a convection desalination stage, where the drainage outlet is opened, and with the outlet depth level with the drainage ditch depth, saline water is evenly discharged from the soil; and a water-saving and emission-reduction stage, where the drainage outlet depth is lower than the crop root zone, breaking the connectivity of small pores and preventing soil salts from moving upwards during crop growth. This synergistic irrigation and drainage achieves the three major goals of salt control, water conservation, and emission reduction.

Methods of separating water, salt, CO2, and crude oil from wastewater, the methods comprising: providing gas / oil separation system that produces a waste saline water stream and a CO2 stream; providing an electrochemical cell having an anode, a cathode, and three electrodialytic compartments; feeding a fresh water stream to the anode to produce H+ and O2; feeding the waste CO2 stream and O2 to the cathode to produce bicarbonate (HCO3—) and hydroxide ions (OH−); feeding the waste saline water stream to a center electrodialytic compartment; wherein the sodium Na+ from the waste saline water stream reacts with the bicarbonate to form NaHCO3 and the chloride (Cl−) from the waste saline water stream reacts with the H+ to produce hydrochloric acid; and producing salt and desalinated water.

The utility model belongs to the technical field of dry quenching waste heat power generation, and particularly relates to a dry quenching waste heat power generation deoxygenization water supply system. Comprising EDI (electrodeionization) equipment, a steam extraction condensing steam turbine or a pure condensing steam turbine, a condenser, a condensate pump, a demineralized water tank of a dry quenching boiler water supply pump station, a deoxygenization water supply pump, a deoxygenization water supply regulating valve group, a three-way valve, a water-water heat exchanger, a water supply preheater and a thermal deaerator. The utility model has the beneficial effects that a desalting water tank and a secondary desalting water pump of a desalting water station are omitted; the fixed pressure difference of the regulating valve is used as main regulation, and the three-way valve is used as auxiliary regulation to ensure normal operation of sampling equipment; after deoxygenated water supply is heated by the water-water heat exchanger, one part of sewage is fed into the dry quenching body circulating water tank for normal production, and the other part of sewage is fed back to a sewage discharge well, so that the temperature of the sewage is reduced, heat and water resources are fully utilized, and meanwhile, the adverse effect of white smoke generated by sewage discharge on a drainage system and the environment is eliminated.

The utility model provides a solid-liquid mixed material conveying system which comprises a material storage tank, a discharging control unit, a power conveying unit and a gas-liquid separation tank and is used for realizing gas-liquid separation and water distribution, and a dehydration unit conveys separated water to the gas-liquid separation tank; the pressure monitoring and control unit is used for controlling the outlet pressure of the slurry pump; the water storage tank is used for receiving the return water from the gas-liquid separation tank, storing water and supplementing water for the conveying process of the solid-liquid mixture; the water inlet pipe is used for conveying desalted water to the water storage tank. The discharging control unit stably controls the water level of the material storage tank. And parts associated with the centrifugal dehydrator, the gas-liquid separation tank, the water storage tank and the like perform own functions, so that water resource recycling, gas-phase pressure balance and liquid level stability are realized. By means of the whole system, stable, efficient and energy-saving conveying of nylon 6 slices from the low position to the high position can be achieved, a foundation is built for efficient and stable polymerization production of nylon 6, and the industrial application value is high.

A system for desalinating water using membrane distillation (MD) integrated with an ejector includes an ejector module and a membrane module. The ejector module includes a water ejector, a first water circulation pump, and a freshwater tank. Freshwater is continuously pumped from the freshwater tank, through the water ejector, and back to the freshwater tank. The membrane module includes a feed tank, a second water circulation pump, a water heater, and a membrane distillation unit. Salt water from the feed tank is pumped through the water heater to form vapor, which is then directed to the membrane distillation unit. The membrane distillation unit comprises a feed chamber, a membrane, and a vapor chamber. Vapor passes through the membrane to the vapor chamber connected to the water ejector. The vapor chamber, under a vacuum, does not include an outlet configured to receive a sweeping gas.

The invention discloses a serial instantaneous dissolution conveying system and a control method thereof. The system comprises at least two sets of dissolving and conveying devices, each dissolving and conveying device comprises a top unit, a middle unit and a bottom unit, each top unit comprises a stock bin, each middle unit comprises a feeding machine, each feeding machine is connected with the corresponding stock bin, each bottom unit comprises a dissolving tank, a demineralized water conveying pipe, a compressed air conveying pipe and a solution conveying pipe, and each dissolving tank is connected with the corresponding feeding machine. Desalted water is conveyed into the dissolving tank through the desalted water conveying pipe to dissolve materials, and compressed air is conveyed into the dissolving tank through the compressed air conveying pipe to drive the solution to be output through the solution conveying pipe. Through optimization design and a parallel control strategy, the problems of low dissolving efficiency, discontinuous liquid supply, large pressure fluctuation and the like in a traditional dissolving and conveying system are solved, efficient and stable conveying of the liquid denitration agent is achieved, storage and transportation losses are reduced, the maintenance cost is reduced, and technical support is provided for industrial continuous denitration.

The invention provides salt-resistant soil for drilling fluid as well as a preparation method and application of the salt-resistant soil, and relates to the field of drilling fluid. The salt-resistant soil for the drilling fluid is prepared from the following raw materials in parts by weight: 25 to 30 parts of purified sepiolite, 7 to 20 parts of 2-acrylamido-2-methylpropanesulfonic acid, 7 to 10 parts of N, N-dimethylacrylamide, 9 to 15 parts of a cationic monomer and 1 to 2 parts of an initiator. The invention further provides a preparation method of the salt-resistant soil for the drilling fluid and application of the salt-resistant soil in the water-based drilling fluid. The salt-resistant soil for the drilling fluid provided by the invention can keep a good slurry making rate in fresh water, saturated salt water and composite salt water, has good rheological property and outstanding temperature resistance, is suitable for various drilling fluid systems, is wide in application range, particularly can be used for directly making slurry by using seawater in offshore drilling operation, and has a wide application prospect. And the construction is more convenient in an environment lacking fresh water resources.

The present application relates to a kind of seawater limit membrane concentration resource preparation oil and gas field drilling fluid system.The seawater membrane concentration resource preparation oil and gas field drilling fluid system includes: optional for the pretreatment unit of natural seawater is pretreated;Further carry out high rejection and low rejection reverse osmosis membrane concentration series connection type reverse osmosis membrane concentration unit, wherein, the rejection of high rejection reverse osmosis membrane to sodium chloride is above 99%;The rejection of low rejection reverse osmosis membrane to sodium chloride is 30% to 60%;Further carry out electrodialysis concentration electrodialysis unit, to obtain the concentrated brine with the salt concentration of 100 to 250 g / L, which can be used for offshore preparation offshore oil and gas field drilling fluid.