230 results about "Bog" patented technology

The invention provides a method for preparing hydrogen and LNG from coke oven gas. The method comprises the following steps: electric decoking; boosting of the coke oven gas by a compression system; cooling of the raw gas coke oven gas by using the BOG gas (the BOG gas is a gas formed after the passive heating gasification of LNG) of LNG in order to further remove tar, benzene, naphthalene and like substances in the coke oven gas; and pretreatment using a TSA process to finely remove macromolecular impurities, such as tar, benzene, naphthalene and the like; wet and dry two-stage desulfurization for removing sulfides in the coke oven gas; two-stage low pressure shifting for a reaction of CO and water vapor to form CO2 and hydrogen; and pressurization using a compressor, an MDEA solution process for removing carbon dioxide, a membrane separation technology for separating hydrogen and methane, separation, concentration and purification of the hydrogen and methane, and dehydration, demercuration and liquefaction of the separated high-concentration methane to obtain the LNG. The coke oven gas is finally converted into the hydrogen and the LNG which have high values, so the energy of thecoke oven gas is fully used, and the environment is protected.

A boil off gas (“BOG”) condenser for use in LNG handling facilities which provides compensation for transient pressure changes in BOG flow due to variations in operations.

The invention relates to peat bog information extracting methods, in particular to a peat bog information extracting method based on ENVISAT ASAR, Landsat TM and DEM data, and solves the problem that peat bog and other bog types cannot be distinguished by a conventional method. The peat bog information extracting method includes step 1, preprocessing Landsat TM data; step 2, preprocessing ENVISAT ASAR data; step 3, re-sampling the ENVISAT ASAR data; step 4, acquiring an ENVISAT ASAR image; step 5, acquiring gradient data; step 6, extracting back scattering coefficient; step 7, determining optimal polarization mode waveband of the ENVISAT ASAR image; step 8, acquiring a division unit; step 9, extracting feature parameters; step 10, determining optimal classification waveband; step 11, establishing a classification decision-making tree; step 12, generating a soil covering type vector file; step 13, making a peat bog map. The peat bog information extracting method is applied to the field of peat bog information extracting.

A liquefied gas reliquefier that can be configured compactly and that is easy to handle is provided. A liquefied gas reliquefier (1) reliquefies BOG resulting from evaporation of LNG in a cargo tank (3). The liquefied gas reliquefier (1) includes a refrigerator group (20) disposed in a secondary-refrigerant circulating channel (24) through which nitrogen, which has a lower condensation temperature than the BOG, circulates to liquefy the nitrogen; a feed pump (22) for feeding the liquid nitrogen cooled by the refrigerator group (20) through the secondary-refrigerant circulating channel (24); and a heat exchanger (12) disposed in the secondary-refrigerant circulating channel (24) to condense the BOG by heat exchange between the BOG and the liquid nitrogen fed by the feed pump (22). The heat exchanger (12) is disposed near the cargo tank (3).

The present invention relates to a boil-off gas treatment apparatus for an electric-propelled LNG carrier having a re-liquefaction function and a method thereof comprising: a boil-off gas cooler (10) which receives natural boil-off gas (N-BOG) produced in an LNG cargo tank and cools the gas through heat exchange with a coolant, a gas compressor (20) which receives the cooled N-BOG from the boil-off gas cooler (10) and compresses the gas to a pressure suitable for use in a DFDE (Duel Fuel Diesel Electric) propelled engine (3), an engine feed gas cooler (30) which cools the N-BOG, whose temperature has risen passing through the gas compressor (20), to a temperature suitable for use in the DFDE propelled engine (3) and supplies the cooled gas to the DFDE propelled engine (3), and a re-liquefaction heat exchanger (50) which receives the extra N-BOG unused in the DFDE propelled engine (3); from the downstream of the engine feed gas cooler (30) and supplies the gas to the LNG cargo tank after cooling and re-liquefying through heat exchange with a coolant. The present invention re-liquefies the extra gas unused for propulsion as well as using the natural boil-off gas produced in the LNG cargo tank as a drive source for propelling a vessel, thereby minimizing the waste of N-BOG.

The invention discloses an anti-disease broccoli cultivation method using urea, Chinese photinia leaf, dried orange peel, perlite, deer bog soil, biology sludge ceramsite, sawdusts, and borax to serve as basic raw materials, boron element is rich, thus improving broccoli output; after broccoli seeds are sowed and before broccoli seedling emergence, Chinese cassia tree water boiling liquid is sprayed on the cultivation basic material in every 3 days, thus preventing the broccoli seedling from being affected by black spot disease with prevention rate above 99%; in a growth period between the broccoli seedling and broccoli ball-flower, an anti-pest sprinkling liquid is sprayed on the top surface and bottom surface of the broccoli true leaves and on the broccoli ball-flower, thus fertilizing the leaves, and preventing and killing diamondback moth, vegetable webworms and aphids with prevention rate between 95-98%; the anti-pest liquid is sprayed on the broccoli ball-flower so as to prevent broccoli aphid invasion with prevention rate between 92-93%. The method can prevent pests in advance in different plantation periods, thus obviously reducing a broccoli pest generation scope and kinds, and the cultivated broccoli is green and organic.

The invention discloses a natural gas liquefying system for carbon dioxide precooling double-stage nitrogen expansion. The natural gas liquefying system comprises a natural gas conveying pipe, a carbon dioxide precooling circulating device, a heavy hydrocarbon removing device, a double-stage nitrogen cooling circulating device, a BOG heat exchanger, a first throttling valve, a second throttling valve, a LNG throttling valve, a gas-liquid separation device, a LNG pump and a LNG tank. The natural gas liquefying system realizes precooling through carbon dioxide and deep cooling through nitrogen, optimally designs the technological process of a carbon dioxide precooling double-stage nitrogen expansion liquefying system, improves the process flexibility, reduces the energy consumption of the liquefying system, improves the safety, and can realize stable, efficient and continuous production demands of offshore liquefied natural gas under the conditions of different sea areas and different gas properties.

The invention relates to a BOG (boil off gas) recovery processing method and system for an LNG (liquid natural gas) receiving terminal, and the BOG recovery processing method comprises the following steps: 1) setting a BOG recovery processing system under the working condition of no output operation of the LNG receiving terminal; 2) feeding BOG produced in an LNG full containment storage tank to the lower end of a BOG re-condenser after BOG is pressurized by a BOG compressor; 3) conveying overcooled LNG from the LNG full containment storage tank to the upper end of the BOG re-condenser by virtue of a pump in the LNG tank, and coming into contact with the BOG at the lower end of the BOG re-condenser to perform heat transfer so as to condense the BOG into LNG; 4) feeding LNG from the BOG re-condenser into an LNG main-sub tank, and then feeding the LNG from the LNG main-sub tank into an output loading system; and 5) feeding the BOG produced in the BOG re-condenser, the LNG main-sub tank and the output loading system into the BOG compressor for pressurizing together with the BOG in the LNG full containment storage tank through throttle control, feeding the pressurized BOG to the lower end of the BOG re-condenser, and going back to the step 3). The invention provides a BOG recovery processing method and system, which are capable of ensuring effective recovery utilization of BOG and can be widely applied to recovery utilization of BOG in the LNG receiving terminal.

The invention discloses a BOG and oil gas combined recycling system of an LNG oil gas cooperative station. According to the BOG and oil gas combined recycling system, BOG and oil gas are synchronously recycled, in the oil gas recycling process, mixed gas is compressed and subjected to water cooling and is pre-cooled through a refrigerating medium, and then, the mixed gas is sequentially subjected to the common condensation link in which the cooling capacity is provided by the low-temperature BOG and the copious cooling link for oil gas recycling; and the obtained low-temperature oil gas exhausted gas is conveyed into a pre-cooling heat exchanger, and the amount of the refrigerating medium for pre-cooling and the refrigerating energy consumption are reduced. In the BOG recycling process, the low-temperature BOG is heated to the normal temperature after being subjected to heat exchange in the copious cooling link and the common condensation link, the BOG is compressed through an ordinary compressor and then is subjected to water cooling, combined cooling of the low-temperature oil gas exhausted gas and the refrigerating medium, low-temperature BOG cooling, one-time throttling expansion cooling and the super-cooling LNG cooling to be cooled step by step, and finally the LNG is formed through secondary throttling expansion condensation. According to the BOG and oil gas combined recycling system, the BOG cooling capacity is sufficiently utilized for oil gas and BOG recycling, the exhausted gas adsorption link is not needed, a BOG compressor is not needed, the cooling capacity is exchanged step by step, operation is convenient, energy saving and consumption reduction are achieved, safety is high, and equipment investment is small.

A system for cooling a boil-off gas (BOG) stream prior to compression in a boil-off reliquefaction plant, comprising a line ( 10 ) for feeding BOG into a compressor ( 11; 11 '') prior to heat exchange with a closed-loop refrigeration system. The refrigeration system comprising compressors ( 2, 3, 4 ) and expanders( 8, 9 ) and a number of heat ex-changers for heat exchange with the BOG stream. The expanders ( 8, 9 ) are arranged in series. A precooler in the feed line ( 10 ) is fluidly connected ( 32, 33 ) to the closed-loop refrigeration system, whereby said BOG is pre-cooled in heat exchange with a portion of the coolant in the closed-loop refrigeration system prior to said compression.

The invention discloses an LNG (Liquefied Natural Gas) filling method for ships. The LNG filling method comprises the following steps: I. pipeline precooling: detecting the dew point, enabling BOG (boil off gas) to enter a BOG storage tank or emptying a vent pipe of a stand column; II. filling outwards: opening an LNG liquid inlet valve, a second liquid phase filling arm ball valve, a filled ship liquid inlet valve, a filled ship gas return valve, a second gas phase filling arm ball valve and a BOG storage tank gas return valve for LNG filling; III. residual liquid recovery: opening a BOG blow-down valve and a third liquid phase filling arm ball valve, pressing residual LNG in a first conveying branched pipe of the pipeline at the top part of a conveying filling arm and in a three-dimensional joint into a filled ship tank, pressing residual LNG in the stand column and a second conveying branched pipe of the pipeline at the top part of the conveying filling arm into an LNG storage tank, thereby finishing residual liquid recovery. The method can realize recovery of BOG and residual LNG, is energy-saving and emission-reduction, can meet the national low-carbon and environment-friendly requirements and can be widely applied to the field of ship energy resource transportation.

The invention discloses a system and a method for re-condensing a boil off gas (BOG) of a liquefied natural gas. The system comprises a liquefied natural gas storage device, a BOG re-condensing device and a liquefied natural gas conveying device, wherein the BOG re-condensing device comprises a static mixer and a gas-liquid separator, an outlet in the top of the gas-liquid separator is connected with a BOG main pipe of a liquefied natural gas storage tank, an outlet in the bottom of the gas-liquid separator is connected with a liquefied natural gas low-pressure outward conveying main pipe, one end of the static mixer is connected with the gas-liquid separator, the other end of the static mixer is connected with the liquefied natural gas low-pressure outward conveying main pipe, and the BOG main pipe is sequentially connected with a compressor and a heat exchanger to be connected with the static mixer. The method includes mixing the liquefied natural gas and the BOG in the static mixer, then feeding the liquefied natural gas and the BOG into the gas-liquid separator, returning a separated gas to the BOG main pipe, and feeding a separated liquid phase into a booster pump outside the tank. According to the system and the method for re-condensing the BOG of the liquefied natural gas, by means of a static mixing and condensation manner, condensation efficiency of the BOG is increased, energy consumption is reduced, and purposes of saving equipment investment and facilitating system operation and maintenance are achieved.

The invention discloses BOG (Boil Off Gas)-zero emission LNG (Liquefied Natural Gas) storage method and device. The BOG-zero emission LNG storage device is characterized in that one end of a flow guide pipe is connected to a BOG condenser, and the other end of the flow guide pipe is immersed in liquid phase of an LNG storage tank; the BOG condenser is arranged in a gas phase space of the upper part of the LNG storage tank; an LNG storage tank pressure detector is arranged in the gas phase space of the upper part of the LNG storage tank; a condenser pipe comprises a hollow pipe, a helical fin and an axial flow guide plate, liquid nitrogen is in pipe pass, and the outer part of the pipe is filled with BOG; the helical fin is arranged on the periphery of the hollow pipe, and the axial guide plate is arranged at the right lower end of the hollow pipe; the hollow pipe is slantwise arranged from an inlet end to an outlet end, and the slant angle theta between the hollow pipe and the horizontal plane is 10 degrees to 30 degrees. The BOG (Boil Off Gas)-zero emission LNG (Liquefied Natural Gas) storage method and device realize the effective integration of LNG storage and BOG recovery and the zero emission of BOG while realizing the effective storage of LNG, has strong applicability and is easy to control.

The invention discloses a process for removing nitrogen in natural gas. The process comprises the following steps: reheating BOG (boil off gas) in an LNG (liquefied natural gas) storage tank through a BOG cold box, feeding the BOG into a BOG supercharging system, supercharging the BOG to 0.6Mpa to 1.5Mpa; cooling the BOG to liquid at the temperature of minus 154 DEG C to minus 165DEG C after sequentially passing through the BOG cold box and a liquefying cold box, further cooling the BOG to minus 168DEG C to minus 176DEG C in a denitrification heat exchanger, cooling the BOG to the minus 178DEG C to minus 185DEG C after being throttled and expanded, discharging the nitrogen gas separated from the nitrogen removal device, and recycling the purified natural gas by utilizing the LNG storage tank. The nitrogen is removed after the BOG in the LNG storage tank is further cooled, the process is mature, the applicability is strong, the denitrification device and the denitrification process are particularly applicable to the working condition with high nitrogen content and large fluctuation range of the raw gas, the exhausted natural gas of the LNG storage tank can be partially recycled, and the storage safety of the storage tank can be improved.

The present ivnention provides a method for combining nano material technology with peat and adopts different formulae and additives to form natural environment-protecting series products with several functions, several varieties and several purposes. Said nano material comprises compounds and oxides of nano metal and nonmetal, and the peat is the screened impurities (including sand and stone)-removed low-grade or high-grade peat whose organic substance content is above 50%, fibre content is above 35% and water content is 15-35%. Its concrete application includes (1). nano peat plant culture nutrient mechanism; (2) nano peat high-effective water and soil improvement environment-protecting nutrients mechanism; (3) nano peat pollution prevention and control mechanism; and (4) nano peat refuse degradation natural activity mechanism.

The invention relates to a boil-off gas (BOG) liquefying process and device. The BOG liquefying process comprises reheated low-temperature BOG is compressed to high pressure through a compressor, precooled and throttled, and most of the BOG is liquefied according to the high-pressure throttling and refrigerating principle. The BOG liquefying process is simple, single refrigerating fluid is adopted, no influence is imposed on an original system, a unified skid-mounting device can be manufactured easily, and the BOG liquefying process and device are particularly suitable for LNG storage and distribution stations and LNG charging stations.

The invention relates to a method for constructing an artificial bird island structure in a wetland park. The method includes transforming an outer contour of an artificial bird island into a zigzag shape to meet the condition that the circumference area ratio PAR index of the artificial bird island is greater than or equal to 5%; constructing a main island area, a meadow area, a shallow water area, a medium and deep water area and a deep water area from the inside to the outside of the artificial bird island and adopting an ecological revetment below the flood level; planting arbor plants, shrub plants, herbaceous plants, bog plants and aquatic plants in the main island area, the meadow area, the shallow water area, the medium and deep water area and the deep water area to form an arbor-shrub-herbaceous-bog-aquatic horizontal plant transition zone; conducting routine maintenance on the plants in the main island area, the meadow area, the shallow water area, the medium and deep water area and the deep water area. The method achieves transformation of the existing island, the overall engineering quantity is small, and the method has the advantages of wide island coastline, multiplehabitat types, good water purification effect, good ecological landscape and low transformation cost.

The invention relates to a method for culturing chrysanthemum morifolium by using reproducible substrates, and belongs to the technical field of plant culture substrates. The method comprises the following steps that: the following ingredients including 3 to 5 parts of coco coir, 1 to 3 parts of cornstalk ferments, 1 to 3 parts of humus, 0.1 to 0.5 part of boggy soil, 0.5 to 1 part of kieselguhr, 0.05 to 0.2 part of sphagna and 0.1 to 0.2 part of eastern bracken fern rhizome are adopted according to volume parts; and the cornstalk ferments are obtained through cutting cornstalks into small sections with the length of 5 to 7cm, covering thin films onto the surfaces of the cornstalks for piling fermentation and turning and stirring the cornstalks once every 4 to 5 days, and the cornstalk ferments can be obtained after all of the cornstalks become rotten and black brown but without objectionable odor during the piling fermentation. The method has the advantages that the culture substrates are mixed according to different proportions, and relevant conditions required by the growth of the chrysanthemum morifolium are met to a great degree. The chrysanthemum morifolium plants cultured by adopting the substrates are strong, and the stalks are thick; and the flowering period of the chrysanthemum morifolium is prolonged to a certain degree, and the ornamental value of the chrysanthemum morifolium is improved.

The invention discloses a voltage transformer handcart. The voltage transformer handcart comprises a vehicle frame, a rocker-in mechanism, a voltage transformer, a spring, a high-pressure fuse, a plum blossom-shaped contact, a contact arm, a connected insulator, an aviation plug and a bog panel, wherein an observing window is formed in the big panel; the spring and the high-pressure fuse are arranged in the contact arm; the plum blossom-shaped contact is arranged on the end part of the contact arm; the contact arm is connected with the connected insulator. The voltage transformer handcart has the excellent effects that the voltage transformer handcart is suitable for a PT cabinet and a metering cabinet; as an independent drawing unit, the voltage transformer can flexibly go into/out of a power distributing system, and the normal operation of other equipment is not affected; the voltage transformer handcart is very convenient in repairing and low in failure rate and has good interchangeability.

The invention provides a method for laying sand filling bag frames in a shallow water closed area. The method comprises the following steps: performing pay-off positioning through a small surveying vessel in the shallow water closed area, and determining the outer boundary of a sand filling bag frame through a buoy; transporting corresponding construction materials including sand blowing pipes, and prefabricating a plurality of sand filling bags; blocking the ends of the sand blowing pipes used for the sand filling bags; laying the sand filling bags in sequence; transporting the sand blowing pipes used for the sand filling bags to a predetermined position through a small vessel, performing anchorage and fixation, and placing the sand blowing pipes at a designated position; starting to lay geotechnical cloth and the sand filling bags from one side of a bog, and binding four corners of the sand filling bags with a sand filling bag row; laying the sand blowing pipes to wait for sand blowing in the process; putting a sand blowing vessel and a sand transporting vessel in place, and then performing blowing and filling; blowing and filling sands to the sand filling bags to reach predetermined elevation, and then performing the construction of the next frame. The method has the beneficial effects that the adopted construction vessels and the materials are relatively common, the construction is convenient, and the engineering cost is greatly reduced. The construction mode is simple, easy to operate and high in practical operability, the risk of falling into the bog is avoided, and the safety of a constructor is effectively guaranteed.