Please select the most similar patent number from A, B, C and D. Which number is?
Disclosed are a system for separating a mixed gas of xenon and krypton by using a hydrate method and an operation method thereof. The system comprises a gas hydrate generating unit, a heat exchange unit and a gas-water separating unit, wherein the main equipment of the gas hydrate generating unit is a reaction tower (1), in which a gas-liquid separating membrane (2) is placed at the bottom of a perforated plate (3) that the mixed gas first comes into contact with, and during the upstream movement of the mixed gas in the reaction tower, xenon gas comes into contact with water attached to the perforated plate (3) to generate a xenon hydrate particle; the main pieces of equipment of the heat exchange unit are a heat exchanger A (7-1) and a heat exchanger B (7-2); the main equipment of the gas-water separating unit is a gas-water separating tower (8), a gas-water two-phase flow containing xenon is pressurized by a delivery pump E (6-5) and then injected from the middle of the gas-water separating tower (8), xenon is separated from decomposed water under the action of gravity, then rises to the top of the tower, and is produced by a flow control valve E (5-6) after being dehumidified by a drying bed (9); and the decomposed water sinks to the bottom of the tower, is pressurized by a delivery pump F (6-6) and then enters the heat exchanger B (7-2) for heat exchange.
A: A mining method and a mining device for a marine natural gas hydrate. The mining method comprises the following steps: 1. after construction of a vertical well is complete, constructing a fixed pipe (8), setting up a mining well in the center of the fixed pipe (8), and filling a space between an inner wall of the fixed pipe (8) and an outer wall of the mining well with a uniformly mixed mixture; 2. introducing a self-excited oscillation jet nozzle (6) into the mining well along the vertical well (22), and reaching a designated position through a hole on the mining well so as to perform spraying on the mixture, so as to evenly break the mixture such that an artificial crack is formed; 3. carrying out depressurization mining at a corresponding temperature, so that the hydrate decomposes to produce gas; and 4. separating in a gas-liquid separation device (20) a gas-liquid mixture mined from the mining well, so as to obtain a liquid and the gas, and collecting the obtained liquid and gas. The mining method has advantages such as stable decompression mining, increased mining efficiency, recovery of high-concentration natural gas, automatic operation, can be remote controlled, and can provide guidance for mining of marine natural gas hydrates.
B: A test apparatus for separating and measuring generated gas, water, and sand during natural gas hydrate mining, and a method. The apparatus comprises a natural gas hydrate generation and decomposition system and a filter apparatus. The natural gas hydrate generation and decomposition system comprises a compressed air pump (51), a natural gas hydrate generation and decomposition reaction kettle (55), and a water bath constant temperature control apparatus. The filter apparatus comprises a filter apparatus kettle body (20). An inlet end of the filter apparatus kettle body is connected to a sand sieve pipe region, and the outlet end of the filter apparatus kettle body is connected to a water collection sealed container. Multiple filter layers are provided from the inlet end to the outlet end of the filter apparatus kettle body. The method and the apparatus can separate and measure the gas, water, and sand mixture during a simulated mining process and can more visually reflect the sand generation and prevention effect.
C: Provided is a sea water desalination system using a flue gas hydrate method based on LNG cold energy, belonging to the technical field of hydrate application. CO2 in the flue gas is captured by means of the generation of a hydrate, two stages of hydrate generation chambers are provided for improving the yield of the hydrate, the CO2 hydrate is purified using two steps of gas separation and liquid separation, respectively, and two hydrate decomposition methods, i.e., a heat exchange-type hydrate decomposition method and an air extraction-type hydrate decomposition method, are respectively used to achieve the utilisation of the residual heat of the flue gas and the recycling of CO2. The integration of CO2 capturing and sea water desalination is realized, the problem of a cold energy source for the sea water desalination in the hydrate method is solved by using LNG cold energy, the structure is rational, and the system is exquisite; the two stages of hydrate generation chambers not only solve the problem of capturing CO2 in the flue gas, but also ensure the generation amount of the hydrate; two kinds of hydrate decomposition chambers not only result in the utilisation of the residual heat of hot flue gas and a reduction of heat discharge, but also realize the recycling and storage of CO2; and the sea water desalination system has a high bearing capacity to flue gas source changes, is not influenced by seasons and environments, and has a great practical application value.
D: A method for separating a mixed gas of ammonia and carbon dioxide comprises: firstly compressing the mixed gas of ammonia and carbon dioxide; feeding the compressed gas to a carbon dioxide separation tower (3) after the pressure reaches 15-25 bar, and then feeding the gas to a water separation tower (5) and an ammonia separation tower (16) in sequence. A dilute ammonia-carbon aqueous solution is separated at the lateral line of the water separation tower (5). The compression of the mixed gas is divided into multiple stages, and a direct liquid-spray cooling method is adopted for inter-stage cooling. An air cooler is adopted instead of a cooler which adopts circulating cooling water as the cooling medium.
Answer: D