Please select the most similar patent number from A, B, C and D. Which number is?
A heat pipe steam generator, comprising a boiler (1), a generator (2), and a combustor (3). A combustion end of the combustor (3) extends into a hearth (11) of the boiler. The boiler (1) is connected to the generator (2). The generator (2) is provided with a heat pipe (21). A primary side channel is formed outside the heat pipe (21). A secondary side channel is formed in the heat pipe (21). Heat exchange is made between a medium in the primary side channel and a medium in the secondary side channel. The boiler (1) is connected to the primary side channel of the generator (2) to form a primary side circulation loop which is vacuum-tight. The height of the minimum level of the primary side channel is greater than the height of the maximum level of the boiler (1). The height difference between the level of the primary side channel and the level of the boiler (1) ensures that in one primary circulation loop, the aqueous solution in the generator (2) can still be returned to the boiler (1) in the case that no power is provided by a water pump so as to protect the external oxidizing gas from being sucked into a primary side water circulation loop and prolong the service life of the boiler (1).
A: A tower-type boiler with a primary reheater and a secondary reheater is provided. A super heater of the boiler comprises a low-temperature super heater and a high-temperature super heater (31). A main steam system flow of the boiler comprises the following steps: firstly, feeding water enters into a front flue coal economizer and a rear flue coal economizer (10) which are arranged in parallel, then water came from the outlets of the coal economizers (10) enters into water-cooling walls (1, 2) from the lower part of a hearth (6), wherein the outlets of the water-cooling walls (1, 2) are connected to a separator (19), and at last, the steam came out of the separator (19) enters into the low-temperature super heater and the high-temperature super heater (31) successively. Along the steam flow direction which is from a low temperature to a high temperature at the side of the steam, the primary reheater successively comprises a primary reheating low-temperature reheater (11) and a primary reheating high-temperature reheater, and the secondary reheater successively comprises a secondary reheating low-temperature reheater (12) and a secondary reheating high-temperature reheater. Furthermore, the primary reheater and the secondary reheater are in parallel with each other in a perpendicular flue.
B: Disclosed is a combined heat exchanger set comprising a compression-type heat pump (1), a suction-type heat pump (2), one or more water-water heat exchangers (3) and a connecting pipeline, wherein the connecting pipeline is divided into a primary side pipeline (41) and secondary side pipeline (42), the connection mode of the primary side pipeline is in incremental series, i.e. the primary side pipeline is successively connected to a generator of the suction-type heat pump, the water-water heat exchanger, an evaporator of the suction-type heat pump and an evaporator of the compression-type heat pump, and the connection mode used for the secondary side pipeline is in series after the first parallel connection, in incremental series or independently separate to connect to a heat user. The heat exchanger set can use the heat of a primary network of hot water in steps, thereby substantially increasing the temperature difference in supply and return water in the primary network of hot water of a central heating system, reducing the initial investment in the pipeline system and electricity wastage in running a water pump, improving the utilisation efficiency of combined energy resources of the system, and lowering heating costs.
C: Disclosed is a secondary side passive waste heat removal system, comprising a steam pipeline (140) and a water supply pipeline (160), wherein the steam pipeline (140) hermetically penetrates a containment vessel and is connected to an outlet of a steam generator (130) arranged in the containment vessel as well as a cooling water tank (150) arranged outside the containment vessel, the water supply pipeline (160) hermetically penetrates the containment vessel and is connected to the cooling water tank (150) and an inlet of the steam generator (130), and the steam pipeline (140), the water supply pipeline (160) and the cooling water tank (150) form a circulating channel so as to remove decay heat in the containment vessel out of the containment vessel. The steam pipeline (140) and the water supply pipeline (160) are directly connected to the steam generator (130) on the secondary side so as to prevent the steam generator (130) from drying out, and coolant leakage, in the event of malfunction. The cooling water tank (150) is arranged outside the containment vessel, such that more available space of the containment vessel is obtained. Moreover, by using an open circuit, there is no need to arrange a heat exchanger, required by the conventional passive waste heat removal system, in the cooling water tank (150), and no emergency equipment is required, such that the expenditure on design and construction of the system is lowered.
D: A rapid cooling system and method for a high-temperature gas cooled reactor nuclear power station primary loop after a thermal test. The system comprises a reactor pressure vessel (1), a steam generator (2), a helium-water cooler (4), a gas-water separator (5), a helium compressor (6), an auxiliary steam pipeline (8), a first valve group (9), a second valve group (10), a high-pressure heater (12), a water-feeding pump (11), a fifth valve group (13), a steam-water separator (14), a condenser (18), a fourth valve group (16), a third valve group (15), and a waste liquid tank (17). According to the system and the method, the problem of an uncontrollable thermal test rate in a natural cooling process can be solved, and a cooling time period is shortened; moreover, a secondary side of the steam generator (2) can participate in the thermal test, so that the reliability of a secondary loop system is verified in advance; moreover, the secondary side pipeline of the steam generator (2) can be subjected to water vapor purging by utilizing the thermal test process, so that the secondary loop feed water quality is qualified.
Answer: A