Please select the most similar patent number from A, B, C and D. Which number is?
A system and method for supplying a backup product in an air separation device, as well as a system and method for supplying a lower-pressure product to a user by means of pressurization of a cryogenic liquid pump (2) during normal operation of an air separation device, i.e., when the cryogenic liquid pump (2) is in the cold standby state. By means of the system and method, a cryogenic liquid product taken from a storage tank (1) is pressurized by the cryogenic liquid pump (2) to produce a lower-pressure product by taking full advantage of the low-speed operation of the cryogenic liquid pump (2) in the cold standby state, and the lower-pressure product is transmitted to product supply lines (7, 8) of a user, to achieve the function of supplying the lower-pressure product to the user. The system and method not only reduce the energy loss of the cryogenic liquid pump (2) in the cold standby state for a long time, but also avoid the bleeding rate of the cryogenic liquid product generated by sending a part of the cryogenic liquid product back to the storage tank (1), so that the advantage of quickly starting the cryogenic liquid pump (2) from the cold standby state is ensured, and the requirements of the user to the higher-pressure product and the lower-pressure product can be satisfied.
A: Disclosed are a method and a device for filling a dry-type dewar flask. A dry-type dewar flask (1) provided with a porous absorption material (2) capable of absorbing a low-temperature liquid is filled with a low-temperature liquid, such as liquid nitrogen; and the low-temperature liquid enters a supercooled state by means of vacuum-pumping or adding liquid helium, etc. Additionally providing the porous absorption material (2) to absorb the low-temperature liquid can realize quick and efficient filling and obtain a high-quality cold source.
B: The present invention relates to fully-liquefied gas separation equipment and process. The fully-liquefied gas separation equipment comprises air filtration, compression, precooling, and purification systems, a high-temperature expander, a low-temperature expander, a main heat exchanger, and a rectification system. The air filtration, compression, precooling, and purification systems are connected sequentially to a pressurizing side of the high-temperature expander, a pressurizing side of the low-temperature expander, and the main heat exchanger and then is divided into two branches, respectively connected to an expanding side of the low-temperature expander and the rectification system. The expanding side of the low-temperature expander is connected respectively to the main heat exchanger and the rectification system. The main heat exchanger in turn is connected to the expanding side of the high-temperature expander. The expanding side of the high-temperature expander in turn is connected to the main heat exchanger. The main heat exchanger in turn is connected to the purification system. A low-pressure contaminated nitrogen outlet and a low-pressure nitrogen outlet of the rectification system respectively are connected to the main heat exchanger. The heat exchanger is then connected to the precooling system. The fully-liquefied gas separation process is implemented on the basis of the fully-liquefied gas separation equipment. The present invention has a simple configuration, is easy to implement, provides high gas separation efficiency, and has a low energy consumption.
C: A waste heat recovery system, comprising N circulation loops in which gas/liquid phase variable media circulate, N being an integer greater than or equal to 1. When N is 1, a first circulation loop comprises a waste heat exchanger, a first stage steam turbine or a first stage expander, a first stage condenser and a first stage liquid pump which are sequentially connected from end to end. When N is an integer greater than or equal to 2, an Nth circulation loop comprises an N-1 stage condenser, an N stage steam turbine or an N stage expander, an N stage condenser and an N stage liquid pump which are sequentially connected from end to end, the N-1 stage condenser being configured to cause an Nth medium flowing through the Nth circulation loop to cool an Nth-1 medium outputted by an N-1 stage steam turbine or an N-1 stage expander, the N stage condenser being configured to cool the Nth-1 medium outputted by the N stage steam turbine or the N stage expander, the N stage condenser being configured to cool the Nth medium outputted by the N stage steam turbine or the N stage expander. A first medium of the first circulation loop is a low temperature liquid medium, and the Nth medium is a low temperature liquid medium having a boiling point of less than 0 degrees Celsius under standard atmospheric pressure. The system effectively utilises waste latent heat energy in the waste heat exchanger, and reduces energy waste. Also provided are a waste heat recovery method suitable for the waste heat recovery system, and a power station.
D: A liquid treatment device, a heat exchange device (4), a heat exchange box (10), a liquid heating appliance (20), a control method for the liquid heating appliance (20), a control device for the liquid heating appliance (20), and a computer-readable storage medium (90). The liquid treatment device comprises: a liquid inlet channel; a liquid outlet channel (32) and a heat exchange device (4); and a heating assembly. When outputting a liquid such as water having a relatively low temperature, the liquid treatment device can first heat the liquid such as water to a relatively high temperature by means of the heating assembly, so as to realize high-temperature sterilization, and then performs, by means of the heat exchange device (4), heat exchange to cool the liquid such as water which has been heated to a relatively high temperature to a temperature required by a user and then discharge same, so that a liquid such as water having a specified temperature can be outputted; in addition, performing high-temperature sterilization or disinfection on the liquid such as water which has a relatively low temperature before outputting same can remove bacteria and microorganisms in the liquid, thereby ensuring that the output low-temperature liquid is clean and sanitary.
Answer: B