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CN-121297298-B - Two-phase flow distributor

CN121297298BCN 121297298 BCN121297298 BCN 121297298BCN-121297298-B

Abstract

The invention discloses a two-phase flow distributor, which comprises a distributor body, wherein a pipe inlet is arranged at the top of the distributor body, an anti-flushing sleeve is arranged at the bottom end of the pipe inlet, a first outlet hole is arranged on the pipe inlet, a second outlet hole is arranged on the anti-flushing sleeve, a first-stage pore plate is arranged below the anti-flushing sleeve and is in fit with the inner wall of the distributor body, a plurality of distribution heads are arranged on the first-stage pore plate, a top inlet, a bottom outlet and a side inlet are arranged on the distribution heads, a diode plate is arranged below the first-stage pore plate and is in fit with the inner wall of the distributor body, a plurality of heat exchange pipes are arranged on the diode plate, the height of the fluid inlet is equal to or higher than the height of the upper surface of the diode plate, and the heat exchange pipes and the distribution heads are arranged in a staggered manner. The invention adopts a multi-stage and pressure drop-free distribution mode, can lead the two-phase flow distribution to be more uniform, improves the heat exchange performance of the heat exchanger, reduces the possibility of frosting of the heat exchanger, effectively prolongs the defrosting period of the heat exchanger and reduces the energy consumption of the system operation.

Inventors

  • ZHOU YUN
  • MA KAIXIN
  • YANG SHAOKANG

Assignees

  • 上海研祚能源有限公司

Dates

Publication Date
20260508
Application Date
20250902

Claims (8)

  1. 1. The two-phase flow distributor is characterized by comprising a distributor body (1), wherein the top of the distributor body (1) is provided with a feed pipe (2), the bottom end of the feed pipe (2) is provided with a flushing-proof sleeve (3), a first outlet hole (4) is formed in the feed pipe (2) in the flushing-proof sleeve (3), the bottom of the flushing-proof sleeve (3) is provided with a second outlet hole (5), a mixture of nitrogen and liquid nitrogen enters the flushing-proof sleeve (3) from the feed pipe (2) to perform gas-liquid separation, and liquid nitrogen flows out from the second outlet hole (5); A first-stage orifice plate (6) is arranged below the anti-flushing sleeve (3), the first-stage orifice plate (6) is attached to the inner wall of the distributor body (1), a plurality of distributing heads (7) are arranged on the first-stage orifice plate (6), a top inlet (8) and a bottom outlet (9) are respectively arranged at the top and the bottom of the distributing heads (7), and a side inlet (10) is arranged at the side part of the distributing heads (7); the utility model discloses a distributor, including distributor body (1), including first-level orifice plate (6), diode board (11) are equipped with below first-level orifice plate (6), diode board (11) with the inner wall of distributor body (1) is laminated mutually and is set up, be equipped with many heat exchange tubes (12) on diode board (11), the top of heat exchange tube (12) is equipped with fluid inlet (13), the height of fluid inlet (13) equals or is higher than the height of diode board (11) upper surface, each heat exchange tube (12) and each distributing head (7) looks alternate arrangement, through first-level distribution's nitrogen gas and liquid nitrogen pass through diode board (11) with after heat exchange tube (12) carries out the second-level distribution again, nitrogen gas and liquid nitrogen two-phase flow can evenly distribute to each in heat exchange tube (12).
  2. 2. The two-phase flow distributor according to claim 1, wherein the upper end of the anti-flushing sleeve (3) is provided with an opening, the bottom end of the inlet pipe (2) is connected with the bottom wall of the anti-flushing sleeve (3), a plurality of first outlet holes (4) are uniformly distributed around the inlet pipe (2), and a plurality of second outlet holes (5) are uniformly distributed on the bottom wall of the anti-flushing sleeve (3) at the periphery of the inlet pipe (2).
  3. 3. A two-phase flow distributor according to claim 1, wherein the primary orifice plate (6) and the secondary tube plate (11) divide the interior of the distributor body (1) into an upper primary distribution chamber (1 a) and a lower secondary distribution chamber (1 b), the top inlet (8) and side inlet (10) of the distributor head (7) are located in the primary distribution chamber (1 a), and the bottom outlet (9) of the distributor head (7) and the fluid inlet (13) of the heat exchange tube (12) are located in the secondary distribution chamber (1 b).
  4. 4. A two-phase flow distributor according to claim 1, wherein the distance between the primary orifice plate (6) and the diode plate (11) is 5-200 mm.
  5. 5. A two-phase flow distributor according to claim 4, wherein the distance between the primary orifice plate (6) and the secondary orifice plate (11) is 50-100 mm.
  6. 6. A two-phase flow distributor according to claim 1, wherein the distance between the fluid inlet (13) of the heat exchange tube (12) and the upper surface of the diode plate (11) is 0-20 mm.
  7. 7. A two-phase flow distributor according to claim 6, wherein the distance between the fluid inlet (13) of the heat exchange tube (12) and the upper surface of the diode plate (11) is 2-5 mm.
  8. 8. A two-phase flow distributor according to claim 1, wherein the lowest point of the side inlet (10) of the distributor head (7) is higher than the upper surface of the primary orifice plate (6).

Description

Two-phase flow distributor Technical Field The invention relates to the technical field of fluid distribution, in particular to a two-phase flow distributor. Background In a tube evaporator, the refrigerant typically becomes a two-phase flow after depressurization through a throttle valve. How the two-phase flow refrigerant is uniformly distributed to each heat exchange tube in the heat exchanger is very important to improve the heat exchange efficiency of the heat exchanger. It is now common practice to use a impingement plate design to improve the flow distribution non-uniformity problem. The conventional impingement plate design can not play a role in uniform distribution when the number of heat exchangers is large and the flow fluctuation is large. This results in excessive distribution of refrigerant in a portion of the heat exchange tubes, maintaining a consistent cold side temperature from the heat exchange tube inlet to the outlet, and even incomplete evaporation, with too little distribution of heat exchange tubes resulting in overheating. Under the condition, the performance of the evaporator is reduced, and meanwhile, the situation of ice blockage of the heat exchanger can also occur, so that the normal operation of the heat exchanger system is directly influenced. When the distribution mode is applied to a heat exchanger of a liquid nitrogen condensation technology of newly-appearing Volatile Organic Compounds (VOCs) tail gas, rapid frost blocking of the hot side (namely the tail gas side of the Volatile Organic Compounds (VOCs)) of the liquid nitrogen heat exchanger occurs, and the liquid nitrogen side serving as a refrigerant, namely the cold side, can cause insufficient heat exchange due to too low temperature of the outlet of part of heat exchange tubes, and further causes that the selection allowance of the heat exchanger needs to be further amplified to increase the equipment investment cost. Meanwhile, on the premise of ensuring the target value of the outlet temperature of the hot side, the total exhaust temperature of the cold side is reduced, and the cold quantity of the liquid nitrogen is not fully utilized, so that the consumption of the liquid nitrogen is increased. As shown in fig. 1, the conventional liquid nitrogen/nitrogen gas distribution method is that liquid nitrogen/nitrogen gas is not uniformly distributed into each heat exchange tube d, particularly liquid nitrogen therein, after entering the impact plate c through the hole b at the bottom from the inlet a. The flow of liquid nitrogen from the impingement plate c onto the tube sheet e may result in excess liquid nitrogen entering the heat exchange tubes (e.g., d 1) near the impingement plate c, while the amount of liquid nitrogen entering the remote heat exchange tubes (e.g., d 2) may be relatively small, or even completely absent. Disclosure of Invention The invention aims to solve the technical problems in the prior art, and provides a two-phase flow distributor, which adopts a multi-stage and pressure-drop-free distribution mode to ensure that the distribution of liquid nitrogen serving as a refrigerant in a liquid nitrogen condenser heat exchange tube in a liquid nitrogen condensation recovery technology of tail gas of a Volatile Organic Compounds (VOCs) process is uniform. The technical scheme of the invention is that the two-phase flow distributor comprises a distributor body, wherein the top of the distributor body is provided with a feed pipe, the bottom end of the feed pipe is provided with a flushing-proof sleeve, the feed pipe in the flushing-proof sleeve is provided with a first outlet, and the bottom of the flushing-proof sleeve is provided with a second outlet; A first-stage orifice plate is arranged below the anti-flushing sleeve and is attached to the inner wall of the distributor body, a plurality of distribution heads are arranged on the first-stage orifice plate, top inlets and bottom outlets are respectively arranged at the top and the bottom of the distribution heads, and side inlets are arranged at the side parts of the distribution heads; A diode plate is arranged below the primary pore plate and is attached to the inner wall of the distributor body, a plurality of heat exchange tubes are arranged on the diode plate, a fluid inlet is arranged at the top of each heat exchange tube, the height of the fluid inlet is equal to or higher than that of the upper surface of the diode plate, and each heat exchange tube is arranged in a staggered manner with each distributor; after the nitrogen and the liquid nitrogen which are subjected to primary distribution are subjected to secondary distribution through the diode board and the heat exchange tubes, the two-phase flow of the nitrogen and the liquid nitrogen can be uniformly distributed into each heat exchange tube. Furthermore, in the invention, the upper end of the anti-collision sleeve is opened, the bottom end of the inlet pipe is connected with the botto