46 results about "Flash-gas" patented technology

The utility model belongs to the technical field of coal gasification high-pressure flash steam purification, and particularly relates to a coal gasification high-pressure flash steam purification device. The purification section is arranged above the heat exchange section of the hot water tower, high-pressure flash steam subjected to heat exchange with grey water is washed and purified, ammonium salt and ash in the high-pressure flash steam are removed, meanwhile, the flushing device is arranged on the cooler, the tube pass of the cooler is flushed, and the heat exchange efficiency is improved. Ammonium salt and ash attached to the inner wall of the cooler tube pass are flushed, so that the cooler tube pass can be efficiently prevented from being blocked; and the cooled high-pressure flash steam is subjected to gas-liquid separation, so that ammonium salt, ash and moisture in the high-pressure flash steam are greatly reduced, the high-pressure flash steam is purified and fed into a compressor, and the load and damage frequency of the compressor are reduced.

The embodiment of the invention provides an estimation method and device for refrigerant stock of a refrigerating system and the refrigerating system. The method comprises the steps that first temperature information and first pressure information of a refrigerant at an outlet of a condenser and second temperature information of a refrigerant at an inlet of an expansion valve are obtained; according to the first pressure information and the first temperature information, the supercooling degree of an outlet of the condenser is determined; according to the difference between the supercooling degree of the outlet of the condenser and a preset supercooling degree threshold value, it is judged that abnormal flash gas exists in the refrigerating system; according to the first temperature information, the second temperature information and latent heat of vaporization of the refrigerant under the first pressure information, the flash gas ratio is calculated, the supercooling degree of an outlet of the condenser is corrected, and the corrected supercooling degree is obtained; and according to the corrected supercooling degree of the condenser outlet, the refrigerant stock of the refrigerating system is estimated based on a correlation model of the corrected supercooling degree of the condenser outlet and the refrigerant stock. According to the technical scheme provided by the embodiment of the invention, the accuracy of quality estimation of the refrigerant stock can be improved.

The invention discloses a subcooler and a deep subcooler for a refrigerating system and a control method of the subcooler and the deep subcooler, and belongs to the technical field of refrigeration. The deep subcooler comprises a subcooling heat exchange unit, an independent cold source loop and a pressure control valve; the supercooling heat exchange unit is connected between the high-pressure liquid reservoir and the throttling device in series, and the primary liquid refrigerant is deeply cooled to be equal to or close to the target value of the evaporation temperature through low-temperature cooling capacity provided by a low-pressure evaporation system or an independent cold source loop. The independent cold source is driven by a compressor with the minimum refrigerating capacity in the system, and an air return pipeline of the independent cold source is bridged with air return pipelines of other compressors of the system through an outlet pressure balance valve, so that the surplus refrigerating capacity is fully utilized. The evaporation pressure of a cold source loop is changed by monitoring the supercooled liquid temperature and feeding back and adjusting the opening degree of a pressure control valve, precise closed-loop control over the supercooled temperature is achieved, throttling flash gas can be remarkably reduced or even eliminated, the effective refrigerating capacity of unit refrigerant and the heat exchange efficiency of an evaporator are improved, and the system energy efficiency is greatly improved.

The application discloses a liquefied natural gas flash gas liquefaction system and method for a ship and relates to the technical field of liquefied natural gas storage. The following scheme is provided, which comprises a nitrogen expansion refrigeration unit and further comprises a liquefaction heat exchange mechanism, wherein the liquefaction heat exchange mechanism comprises a plate heat exchange assembly and a circulating flow channel adjusting mechanism; the plate heat exchange assembly comprises a heat exchange plate group composed of alternately superimposed first heat exchange plates and second heat exchange plates; the circulating flow channel adjusting mechanism comprises a synchronous frame capable of moving along a direction parallel to plate superimposition, a valve pipe fixed to the synchronous frame and arranged in correspondence with the angular hole channel, and a driving unit for driving the synchronous frame to move. By means of mechanical adjustment, dynamic changes in BOG load are matched in real time, so that the system can be operated close to an optimal energy efficiency point in the whole working condition range, and operation energy consumption is reduced.

The utility model relates to the technical field of high-flash gas recovery, in particular to a gasification grey water high-flash gas recovery device which comprises a first condenser, a second condenser, a torch and a boiler. And a second treatment pipeline is fixedly communicated between the outlet of the second condenser and the first treatment pipeline. The device is reasonable and compact in structure and convenient to use, gasified grey water high-flash gas sent out by the high-pressure flash tank is condensed by the first condenser and then sent into the boiler for blending combustion of byproduct steam, the gasified grey water high-flash gas can be effectively recycled, the combustible gas byproduct steam rich in the gasified grey water high-flash gas is utilized, and the utilization rate of the byproduct steam is improved. The consumption of torch natural gas is reduced, the release of waste gas is reduced, and the environmental protection pressure is relieved.

The invention provides an apparatus and method for producing a hydrogen rich gas, the method comprising the steps of reforming a hydrocarbon feed in an autothermal reformer to obtain a synthesis gas; shifting the synthesis gas in a shift configuration comprising a high temperature shift step; removing CO2 in a CO2 removal section by amine washing to form a hydrogen rich stream, wherein a portion is used as a low carbon hydrogen fuel; and forming a CO2 rich gas stream and a high pressure flash gas stream. The high pressure flash gas stream is advantageously integrated into the apparatus and method to further improve carbon capture.

The invention relates to the field of hydrogenation utilization of C5 raffinate oil, and discloses a method and a system for lightening C5 raffinate oil. The method comprises the following steps: removing impurities from a C5 raffinate oil raw material through a pretreatment tower, and performing heat recovery through a hydrogenation reactor and Rankine cycle in sequence; a reaction product is subjected to primary gas-liquid separation to obtain circulating liquid and a liquid phase product, and after the gas phase product is cooled, light hydrocarbon is sent to secondary gas-liquid separation to recover liquid phase light hydrocarbon and hydrogen-rich tail gas. According to the process, hydrogenation reaction heat is utilized in a stepped and segmented mode, refrigeration is conducted through a Rankine refrigeration unit, low-temperature cooling capacity for flash evaporation gas-liquid separation is provided, and then raw materials are preheated through reaction materials obtained after heat exchange. The method can be used for treating C5 raffinate oil, the reaction efficiency is high, the separation effect is good, and the yield of C5 chemical products is increased; the method has the advantages of high efficiency, energy conservation, high conversion activity, high product yield and improvement of the added value of the product.

The application discloses a kind of based on two-stage compression heat pump's heat engine unit deep waste heat cascade utilization system, comprising, negative pressure flash gas flue waste heat recovery system, two-stage voltage compression heat pump unit, coal-fired cogeneration unit and heat network heater;Through two-stage compression heat pump, the deep utilization of circulating water waste heat and flue gas waste heat is carried out in turn, based on the principle of negative pressure flash, make slurry flash cooling, achieve the purpose of indirect recovery of flue gas waste heat, improve the flue gas waste heat utilization depth of unit, improve overall thermal efficiency and heating capacity, reduce coal consumption, realize energy saving and carbon reduction;The system improves the heating capacity while increasing peak shaving depth, meet the technical requirements of flexible adjustment and energy saving and carbon reduction in three improvement linkage requirements, can actively respond to the depth of power grid peak shaving ball, while meeting the heating load demand, reduce the coal consumption of unit.

The application discloses a kind of decarburization flash gas pressurization recovery device for synthesis ammonia production, it is related to the technical field of flash gas recycling.The present application includes flash tank, the position of left side of flash tank is provided with separation tank, the position of front of flash tank is provided with gas storage tank, the middle position of front side wall of separation tank is fixed with the refrigerating machine that is connected with its inside, the inside of separation tank is provided with separation pipe, the position of rear side of separation tank outside is provided with rotating rod corresponding to rotating hole, the front end of rotating rod is fixed with the metal plate that is connected with the rear side wall of separation tank, the rear side wall of separation tank is fixed with the magnetic ring plate that is adsorbed with metal plate in the position of rotating hole periphery.The present application carries out temperature control to the inside of separation tank by the setting of refrigerating machine, can improve the generation ratio of flash gas, realize the control of the recovery amount of flash gas, simultaneously, the separation of metal plate and magnetic ring plate can make the inclination angle adjustment of rotating rod to separation pipe, improve the recovery efficiency of gas-liquid separation.

A method and corresponding apparatus for extracting ethane from an initial natural gas stream. The method includes the steps of recovering and compressing an overhead stream (98) from a separation column (34) to form a compressed purified natural gas stream (102); liquefying the compressed purified natural gas stream (102) in a liquefaction unit (24) to form a pressurized liquefied natural gas stream (120); flash expanding the pressurized liquefied natural gas stream (120) and recovering in a storage vessel (66); recovering and compressing an expanded flash gas stream (126); separating the compressed flash gas stream (132) into a fuel stream (20) and a recycle stream (134); cooling and expanding the recycle stream (134) and then introducing the cooled and expanded recycle stream into an overhead stage of the separation column (34).

The application discloses a PSA tail gas compressor group component allocation stabilizing system and a method thereof, and belongs to the field of chemical engineering technology. The system is characterized in that the cold box raw material gas is communicated with a first pipeline, flash gas is connected with a third pipeline, rich hydrogen gas is connected with a second pipeline of an inlet of a PSA device, CO product gas is connected with a fourth pipeline, a hydrogen gas outlet of the PSA device is connected with a fifth pipeline, a tail gas outlet sixth pipeline is connected with a seventh pipeline of an inlet of a tail gas compressor, a tail gas outlet of the tail gas compressor is connected with an eighth pipeline, a ninth pipeline of an inlet of a first regulating valve is connected with the fifth pipeline, a tenth pipeline of an outlet is connected with the sixth pipeline, an eleventh pipeline of an inlet of a second regulating valve is connected with the fourth pipeline, a twelfth pipeline of an outlet is connected with the sixth pipeline, and a thermal conductivity analyzer is arranged on the seventh pipeline. The application can realize stable PSA tail gas compressor inlet gas components by means of the thermal conductivity analyzer, the flowmeter and the regulating valve, and further ensure the performance and stable operation of the tail gas compressor.

The present application relates to the technical field of high-pressure acid leaching. Provided is a high-pressure acid leaching system, comprising an autoclave, a preheater, a flash tank and an autoclave feed pump. The autoclave is connected to the flash tank, the flash tank is connected to the preheater to introduce a flash gas into the preheater, and the preheater is connected to the autoclave via the autoclave feed pump. High-pressure air is introduced into the autoclave and / or the flash tank. The introduction of the high-pressure air into the autoclave and / or the flash tank enables the flash gas and the high-pressure air to jointly enter the preheater, thereby increasing the internal pressure of the preheater and reducing the temperature of ore slurry at an outlet of the preheater, and thus avoiding or reducing the occurrence of cavitation.

The application provides a kind of intelligent control method and system of Claus sulfur recovery unit, comprising: calling the decoupling model established in advance, using the real-time data in initial disturbance event record, calculate and separate out the contribution value of methanol flash gas descent and liquid nitrogen tail gas peak respectively on the independent and dynamic influence of total air demand, output two groups of time series data of independent disturbance influence;According to the output of two groups of time series data of independent disturbance influence, by superposition algorithm and combining respective time sequence characteristics, the net change amount of total air demand in future preset period is calculated, and the predicted net air demand change trajectory is obtained;According to the predicted net air demand change trajectory, combined with the current system state, the target air flow adjustment scheme is calculated by using optimization control algorithm, the predicted air demand change is compensated in advance, and the obtained air flow regulation instruction sequence is issued to the actuator of air supply system for execution.

The invention provides a condenser and a refrigerating system. The condenser comprises a shell, a partition piece, a plurality of condensation heat exchange pipes and a plurality of supercooling heat exchange pipes. The housing defines a cavity for receiving a refrigerant. The containing cavity is divided into a condensation area and a supercooling area through the partition piece. The condensation heat exchange pipes are arranged in the condensation area. The multiple supercooling heat exchange pipes are arranged in the supercooling area. A plurality of throttling holes are formed in the partition piece, the condensation area and the supercooling area are communicated through the throttling holes so as to allow refrigerant liquid obtained through condensation in the condensation area to enter the supercooling area through the throttling holes, and the size of the throttling holes is designed to enable the pressure of the refrigerant liquid passing through the throttling holes to be reduced and flash gas is generated. The supercooling area comprises an upper supercooling area body and a lower supercooling area body which are communicated with each other, the lower supercooling area body is located at the bottom of the shell in the height direction, the upper supercooling area body extends upwards from the lower supercooling area body and is at least partially surrounded by the condensation area, and supercooling heat exchange pipes are arranged in the upper supercooling area body and the lower supercooling area body.

The invention relates to the technical field of air conditioners, in particular to an air conditioning system and a control method thereof.The air conditioning system comprises a refrigerant circulation loop, a compressor, a condenser and an evaporator are arranged on the refrigerant circulation loop, the air conditioning system further comprises a bypass auxiliary path and a flash evaporator, and the flash evaporator is arranged on the refrigerant circulation loop and located between the condenser and the evaporator; one end of the bypass auxiliary path is connected with an air outlet of the flash evaporator, and the other end is connected with a pipeline between the evaporator and an air suction port of the compressor; and the gas refrigerant subjected to flash evaporation can enter the bypass auxiliary path and then is mixed with the refrigerant at the outlet of the evaporator to enter an air suction port of the compressor. The gaseous refrigerant after flash evaporation enters the bypass auxiliary path and is mixed with the refrigerant at the outlet of the evaporator to enter the air suction port of the compressor, it is guaranteed that the air suction temperature and the air suction pressure of the compressor are close to the non-frosting condition, the separated liquid refrigerant enters the evaporator to fully absorb heat and evaporate, and the frosting risk of the evaporator is reduced.

The invention relates to the technical field of LNG transportation and storage, and discloses a marine liquefied natural gas flash steam liquefaction system which comprises an LNG storage device, a BOG cold compression device, a BOG condenser and a BOG reliquefaction device. Flash steam generated by the LNG storage device is firstly shunted to the BOG reliquefaction device, is pressurized by the flash steam compression mechanism, then enters the subsequent heat exchanger to be subjected to deep cold exchange with a mixed working medium and is liquefied into LNG again to flow back to the storage device, the whole process is smooth in linkage and free of redundant links, and efficient recycling of the flash steam is ensured. A gradual change type screw rod structure and a gap adjusting function in a flash steam compression link can be adapted to complex working conditions such as air inlet pressure and flow fluctuation, and the influence of a marine bumpy environment on equipment operation is reduced; through the collaborative design of lubricating oil circulation and flash steam cooling, the system can still keep a stable and reliable operation state under complex offshore conditions, and efficient and energy-saving liquefaction treatment of flash steam is achieved.

The utility model provides a carbon capture and compression system based on comprehensive utilization of waste heat and LNG (Liquefied Natural Gas) cold energy. The carbon capture and compression system comprises a flue gas cooler, an absorption tower, a rich liquid diverter, a lean and rich liquid heat exchanger, a regenerated gas heat exchanger, a flash steam compressor, a regeneration tower, a reboiler, a two-stage compressor, a multi-stream heat exchanger and a carbon dioxide condenser. A pregnant solution diverter and a regenerated gas heat exchanger are used for recycling waste heat of regenerated gas at the top of the regeneration tower to heat pregnant solution, and sensible heat and latent heat of absorbent regeneration are reduced; the cold energy of liquefied natural gas can be used for liquefying carbon dioxide under intermediate pressure, the compression stage number and compression power consumption of the carbon dioxide are reduced, the multi-stream heat exchanger is used for recovering the compression heat of the carbon dioxide for heating condensate water, the using amount of latent heat and cooling water is further reduced, and the energy consumption is reduced. And full recovery of waste heat in a chemical absorption method carbon dioxide capture and compression system and efficient utilization of liquefied natural gas cold energy are achieved, and the energy utilization efficiency and economical efficiency of the system are improved.

The application relates to the field of coal gasification, in particular to a process for water-coal-slurry gasification flash gas heat utilization and methanol-to-olefin methanol preheating, which comprises the following steps: S1, methanol from a methanol tank area is heated and then subjected to catalytic reaction to generate a gas with ethylene and propylene as main products; S2, high-pressure flash gas is subjected to heat exchange with the methanol evaporator, and after cooling, enters a high-flash-gas separator for gas-liquid separation, and the separated gas phase and liquid phase enter a high-flash-gas condensate stripping tower; S3, the high-pressure flash gas after gas-liquid separation is subjected to stripping to reduce the ammonia-nitrogen content in the condensate; S4, the stripped condensate is pressurized by a pump and subjected to heat exchange with methanol in the methanol preheater, and after cooling, is sent to a gasification deaerator; and S5, stripping gas is treated to obtain a raw material gas. The application has the effects of solving the problems of flash gas heat waste in the existing water-coal-slurry gasification flash process and a large amount of steam consumption in the methanol preheating process in the methanol-to-olefin process.

This invention discloses a method for cryogenic air separation and a suitable distillation column system. A high-pressure column and a low-pressure column are arranged side-by-side, with a first condenser-evaporator located at the bottom of the low-pressure column and a second condenser-evaporator located at the top. Oxygen-enriched stream from the bottom of the high-pressure column is fed into the low-pressure column for further distillation. The high-pressure liquid nitrogen generated by the first condenser-evaporator is depressurized and separated into gas and liquid phases in a gas-liquid separator. The liquid phase is then combined with the low-pressure liquid nitrogen generated by the second condenser-evaporator, pressurized by a liquid nitrogen pump, and fed into the high-pressure column as reflux liquid. The gaseous product in the gas-liquid separator is combined with the flash gas at the outlet of the liquid nitrogen pump and returned to the low-pressure column.

The application discloses an ORC-KC-ORC composite power generation system and method for synergistically utilizing pyridine base waste heat and LNG cold energy, and belongs to the technical field of industrial waste heat and LNG cold energy recovery, and comprises a pyridine base production process unit, an LNG cold energy supply unit and a three-stage composite power generation unit; a composite architecture of high-temperature ORC, medium-temperature KC and low-temperature ORC is adopted; wherein the high-temperature ORC recovers 110-130 DEG C waste heat, the medium-temperature KC recovers 80-110 DEG C waste heat by utilizing the temperature-variable boiling characteristics of ammonia water, and the low-temperature ORC generates power by utilizing LNG and BOG cold energy. The LNG cold energy supply unit is additionally provided with a BOG recovery pipeline, and flash gas cold energy is introduced into a low-temperature condensing end. Through ORC-KC-ORC cascade coupling, the application realizes efficient synergistic utilization of multi-grade waste heat and LNG cold energy, and has the advantages of small heat exchange irreversible loss, high cold energy utilization rate, compact and reliable system and the like.

The invention discloses a PSA (Pressure Swing Adsorption) tail gas compressor component blending and stabilizing system and a method thereof, and belongs to the technical field of chemical engineering. Cold box feed gas of the system is communicated with a first pipeline, flash steam is connected with a third pipeline, hydrogen-rich gas is connected with an inlet second pipeline of a PSA device, and CO product gas is connected with a fourth pipeline; a hydrogen outlet of the PSA device is connected with a fifth pipeline; a tail gas outlet sixth pipeline is connected with an inlet seventh pipeline of a tail gas compressor; a tail gas outlet of the tail gas compressor is connected with an eighth pipeline; an inlet ninth pipeline of the first regulating valve is connected with a fifth pipeline, and an outlet tenth pipeline of the first regulating valve is connected with a sixth pipeline; an eleventh pipeline of an inlet of the second regulating valve is connected with a fourth pipeline, and a twelfth pipeline of an outlet is connected with a sixth pipeline; and the thermal conductivity analyzer is arranged on the seventh pipeline. Inlet gas components of the PSA tail gas compressor can be kept stable through the thermal conductivity analyzer, the flow meter and the adjusting valve, and then the performance and stable operation of the tail gas compressor are guaranteed.

The present invention provides an apparatus and a process for producing a hydrogen-rich gas, the process comprising the steps of: reforming a hydrocarbon feed in an autothermal reformer, thereby obtaining a syngas; converting the syngas in a conversion configuration comprising a high temperature conversion step; removing CO2 in a CO2 removal section by amine wash, thereby forming a hydrogen-rich stream, a portion of which is used as a low hydrocarbon fuel; and forming a CO2-rich gas stream and a high pressure flash gas stream. The high pressure flash gas stream is advantageously integrated into the apparatus and process to further improve carbon capture.

The present invention discloses a method for cryogenically separating air and a distillation column system suitable therefor. A high-pressure column and a low-pressure column are arranged side-by-side, a first condenser evaporator is disposed at a bottom of the low-pressure column, and a second condensing evaporator is disposed at a top of the low-pressure column. An oxygen-rich stream from a bottom of the high-pressure column is sent to the low-pressure column for further distillation. High-pressure liquid nitrogen produced by the first condensing evaporator is reduced in pressure and then separated into a gas phase and a liquid phase in a gas-liquid separator. The liquid phase merges with low-pressure liquid nitrogen produced by the second condensing evaporator, is pressurized by a liquid nitrogen pump, and then input to the high-pressure column as a reflux liquid. A gas-phase product in the gas-liquid separator merges with a flash gas at an outlet of the liquid nitrogen pump and then returns to the low-pressure column.

This invention discloses a method and kiln for controlling the calcination of kaolin using venting gas, relating to the field of calcination kiln control. The method includes: calculating the circumferential temperature difference of the kiln shell at the same cross-section and the axial temperature gradient of the kiln shell at adjacent cross-sections; identifying abrupt changes in the mean value based on statistical detection of change points; and filtering overburning hotspot cross-sections based on the number of sign flips. The method calculates the overburning tendency index of the overburning hotspot cross-section to trigger an overburning warning signal priority. Based on the priority of the overburning warning signal, the kiln circumferentially arranged burners in the area corresponding to the overburning hotspot cross-section are divided into near-shell burner groups and far-shell burner groups. Only the near-shell burners have their fuel flow reduced and the combustion air volume increased, while the far-shell burners maintain their original output. When multiple overburning hotspots exist simultaneously, the cross-section with the highest priority is processed first. This achieves accurate detection and targeted elimination of localized overburning while maintaining the overall calcination intensity of the cross-section and prioritizing the processing of the overburning hotspots that deteriorate the fastest.

The utility model discloses a CO2-rich synthesis gas methanol synthesis system which comprises a hydrogen storage unit, a synthesis gas decarbonization unit, a synthesis gas compression unit, a synthesis unit, a gas / gas heat exchanger, a cooler, a high-pressure flash evaporator, a hydrogen recovery unit, a low-pressure flash evaporator and a low-pressure flash vapor compression unit, the hydrogen storage unit can receive volatilly supplied hydrogen and recycled recovered hydrogen, and the hydrogen and the CO2-rich synthesis gas are jointly used as raw material gas for methanol synthesis after being cached by the hydrogen storage unit; the CO2-rich synthesis gas is formed by mixing synthesis gas generated by the synthesis gas decarbonization unit and low-pressure flash steam of the low-pressure flash steam compression unit. According to the system, the CO2 removal rate of the synthesis gas decarbonization unit is adjusted according to the supply quantity of hydrogen, and H2 and CO2 in methanol synthesis tail gas are recycled, so that hydrogen production by renewable energy fluctuation and methanol flexible synthesis by biomass synthesis gas are realized, the utilization rate of renewable carbon is high, and the methanol preparation cost is low.

This invention provides a cooling system using a non-azeotropic mixed refrigerant that can prevent self-decomposition (disproportionation) and suppress the occurrence of liquid compression by improving the accuracy of the detection process for the generation of flash gas. [Solution] This cooling device 100 includes a processing unit 8 that performs determination processing regarding the generation of flash gas, which is a mixture of a gaseous non-azeotropic mixed refrigerant and a liquid non-azeotropic mixed refrigerant, based on the correlation between the resistance value (valve opening) of the intermediate pressure electronic expansion valve 6 (first resistance part) and the pipe temperature, and the measured value of the pipe temperature.

The invention relates to the technical field of refrigeration equipment, and discloses a cascade rapid refrigeration system for mushroom ultra-low-temperature crushing, which comprises a cascade refrigeration cycle device, a low-temperature stage loop, a low-temperature stage loop, a low-temperature stage loop, a low-temperature stage loop and a low-temperature stage loop, the pressure potential energy bypass assembly is used for establishing a transient liquid supply channel from a high-pressure liquid phase region to the evaporator; the synchronous negative pressure clamping assembly comprises a low-impedance pipeline and a clamping valve which are connected with the outlet of the evaporator and the air suction buffer container; by means of low-pressure potential energy of the air suction side, differential pressure suction is carried out on the evaporator through the low-impedance channel at the pulse injection moment, instantaneous flash vapor phase working media are rapidly dredged, back pressure surge caused by return air flow resistance is prevented, and the air flow resistance of the evaporator is reduced. And the maximum heat transfer temperature difference is maintained during the thermal shock period.

The utility model relates to a device capable of recovering flash gas in a liquid oxygen storage tank, which belongs to the technical field of liquid oxygen storage equipment and is used for recovering flash gas in the liquid oxygen storage tank. According to the technical scheme, an oxygen compressor is connected with a storage tank through a gas conveying pipeline, a safety discharge valve is installed at the top of the storage tank, a stop valve and a safety valve are installed in the gas conveying pipeline, the upper end of a recovery pipeline is connected to the top of the storage tank 1, and the lower end of the recovery pipeline is connected to the gas conveying pipeline between the stop valve and the safety valve; a low-temperature compressor, an exhaust valve and a check valve are additionally arranged on the gas conveying pipeline between the safety valve and a connecting point at the upper end of the recycling pipeline, a recycling adjusting valve is additionally arranged on the gas conveying pipeline between the connecting point at the upper end of the recycling pipeline and the storage tank, and a bypass valve is installed in the recycling pipeline. The flash evaporation waste gas recovery device is simple in structure, convenient to use and good in effect, flash evaporation waste gas in the storage tank can be recovered, the problem of discharge of flash evaporation gas of the storage tank is effectively solved, the effects of saving energy and reducing consumption are achieved, and economic benefits of enterprises are improved.

The application discloses a coal chemical gasification ash water isothermal low-pressure environment-friendly low-carbon type deamination method, and mainly comprises the following steps: after the impurity removal of gasification ammonia-containing ash water, the ash water is mixed with flash condensate saturated with carbon dioxide in a raw material water mixing tank, and then enters an ash water deamination tower as raw material water; low flash gas purification utilizes generated secondary steam, and low flash gas incondensable gas, flash condensate stripping acid gas, carbon dioxide and the like enter the ash water deamination tower as deamination medium, and ammonia gas in the ash water is stripped; the tower is not heated and not warmed, the pressure in the tower is maintained according to the saturated steam pressure under the temperature of the raw material water entering the tower; the removed ammonia gas forms low-temperature ammonia water, and enters an original shift stripping tower and an ammonia recovery system of an enterprise for recycling. Finally, the problems of scaling and plugging in the ash water deamination and conveying processes are completely solved, the purification utilization of low flash gas is realized, water vapor consumption is completely replaced, the consumption of circulating water for low flash gas condensation is reduced, the ash water reaches the standard for environmental protection, carbon emission is indirectly reduced, and the isothermal, low-pressure, environment-friendly and low-carbon ammonia-containing ash water treatment target is achieved. The application has no steam consumption, low process investment and operation cost, and good economic benefits, and the investment recovery period is 3-5 years.

The invention discloses a dry gas low-temperature purification and separation process. The process comprises the following steps: absorbing and condensing dry gas through low-temperature absorption oil to obtain absorption tail gas and rich absorption oil; the rich absorption oil is subjected to flash evaporation, and flash evaporation gas and flash evaporation oil are obtained; carrying out steam stripping separation on the flash oil in a regeneration tower to obtain regenerated gas and lean absorption oil; the lean absorption oil is pressurized, subjected to heat exchange and cooled and then circulated back into the absorption tower to serve as absorption oil; enabling the flash steam and the regenerated gas to enter an adsorption tank, and removing carried absorption oil components; the adsorption tail gas enters an amine liquid absorption tower for desulfurization and decarburization, and C2 + light hydrocarbon components are obtained. According to the method, specific absorption oil and lower operation pressure are selected, effective recovery and removal of C2 + hydrocarbon, hydrogen sulfide and carbon dioxide in the dry gas can be realized only through primary absorption, the absorption operation is greatly simplified, and the energy consumption of C2 + resource recovery is reduced.