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CN-117886435-B - Liquid-gas jet device

CN117886435BCN 117886435 BCN117886435 BCN 117886435BCN-117886435-B

Abstract

The invention belongs to the technical field of aerobic biochemistry, and particularly relates to a liquid-gas ejector, which comprises an air inlet pipe, a liquid inlet pipe, an air suction tank, a jet nozzle, a throat, a guide cylinder, a mixer and the like, wherein a first channel is arranged between an outlet of the nozzle and a first jet port of the air suction tank, air can be sucked into the first jet port from the first channel, the throat is connected with the first jet port, a second channel is arranged between an outlet of the throat and the guide cylinder so as to facilitate sucking liquid flow to form a second gas-liquid mixed flow, the throat is used for mixing and conveying the first gas-liquid, the mixer is used for mixing and conveying the second gas-liquid mixed flow, and the gas-liquid mixed flow at an outlet of the mixer is contacted with liquid in a liquid pool to form third oxygen transfer. The scheme realizes the three times of oxygen mass transfer of the gas and the liquid, breaks through the limit of one-to-one ratio of the optimal mass transfer ratio of the air and the liquid in the throat, ensures that the gas and the liquid are fully mixed, avoids the defect of local high dissolved oxygen, and improves the oxygen transfer efficiency between the gas and the liquid.

Inventors

  • YI ZHIHU

Assignees

  • 易治虎

Dates

Publication Date
20260505
Application Date
20230403

Claims (9)

  1. 1. The liquid-gas ejector is characterized by comprising: The air suction tank (3) is communicated with the air environment, and a first jet port is arranged at the bottom of the air suction tank; a first channel is arranged between the jet nozzle (4) and the first jet port, and air in the air suction tank (3) can be sucked into the first jet port from the first channel; The air and liquid are mixed in the throat (5) to form a first gas-liquid mixed flow, and an outlet of the throat (5) is a nozzle of the first gas-liquid mixed flow; The guide cylinder (6) is communicated with a liquid environment at the inlet, and is internally provided with a second jet orifice, wherein the guide cylinder (6) is in a funnel shape with a big upper part and a small lower part, and the second jet orifice is positioned at the inner bottom of the guide cylinder (6); The mixer (7) is connected with the second jet port, liquid outside the guide cylinder (6) can be sucked into the mixer from the second channel, and the first gas mixing flow and the liquid sucked in the second channel are mixed in the mixer (7) to form a second gas-liquid mixing flow, and the second gas-liquid mixing flow is conveyed by the mixer (7).
  2. 2. The liquid-gas ejector according to claim 1, characterized in that an air inlet pipe (1) is provided at the top or side wall of the air suction tank (3), an air suction chamber is provided in the air suction tank (3), and in use, the air suction tank is placed on the liquid surface and the guide cylinder is submerged under the liquid surface, or all parts of the liquid-gas ejector except the inlet of the air inlet pipe are submerged under the liquid surface, and the air suction chamber is communicated with the air environment through the air inlet pipe (1).
  3. 3. The liquid-gas ejector according to claim 2, wherein one end of the liquid inlet pipe (2) is communicated with a water pump, and the other end of the liquid inlet pipe (2) penetrates through the tank wall of the gas suction tank (3) and stretches into the gas suction chamber to be connected with the jet nozzle.
  4. 4. A liquid-gas ejector according to claim 3, wherein the jet direction of the jet nozzle (4) is vertically downward.
  5. 5. The liquid-gas ejector according to claim 4, wherein the nozzles of the jet nozzle (4) are all vertically and downwardly ejected.
  6. 6. The liquid-gas ejector according to claim 5, wherein the cross-sectional area of the throat (5) is 2-6 times of the total cross-sectional area of the nozzle of the jet nozzle (4), and the cross-sectional area of the mixer (7) at the inlet is 1.25-3 times of the cross-sectional area of the throat (5) at the outlet.
  7. 7. The liquid-gas ejector according to claim 1, wherein the center lines of the jet nozzle (4), the suction tank (3), the throat pipe (5) and the guide cylinder (6) are all positioned on the same vertical line.
  8. 8. The liquid-gas ejector according to any one of claims 1 to 7, wherein the mixer (7) is straight, curved or conical.
  9. 9. The liquid-gas ejector according to claim 8, wherein the cavity in the mixer (7) is in a double-layer funnel shape with a smaller upper part and a larger lower part when the mixer (7) is in a conical shape.

Description

Liquid-gas jet device Technical Field The invention belongs to the technical field of aerobic biochemistry, and particularly relates to a liquid-gas ejector. Background An aerobic biochemical system (such as an aerobic bioreactor, an aeration tank, an aquaculture tank and the like) needs to efficiently dissolve oxygen in air into liquid (water is an action object of the aquaculture tank and the like, feed liquid is an action object of the aeration tank and the bioreactor, and the action object is hereinafter collectively referred to as liquid) so as to facilitate the utilization of organisms in the liquid. The oxygenation system is a key device of the aerobic biochemical system. The current oxygenation systems come in a wide variety of forms and can be broadly divided into three general categories: 1) Air-dispersing the pores. The form of the air distribution plate is a perforated pipe type, a tooth-shaped air distribution cover type, a micropore air distribution pipe (plate ) and the like. The characteristic of this type of device is that the surface of the gas bubble is in contact with the liquid when the gas bubble in the liquid moves in the liquid, and oxygen in the gas bubble is transferred into the liquid through the wall of the gas bubble. The oxygen transfer efficiency (the transfer efficiency of oxygen in air to dissolve in a liquid) is related to the residence time of bubbles in the liquid and the size of the bubbles. The larger the pore diameter of the pore, the larger the bubble, the larger the buoyancy force, the shorter the residence time, and the lower the oxygen transfer efficiency. The smaller the aperture, the smaller the bubbles, but the larger the resistance loss, the larger the air supply energy consumption, and the pores are easy to be blocked, and the maintenance is difficult; 2) Mechanically clamping air. The form of the impeller is a surface impeller, a rotary brush, a submerged impeller and the like. The device has the defects that the surface impeller and the rotating brush have limited reoxygenation amount, the gas-liquid contact oxygen transfer time is too short, and the improvement of the power efficiency is influenced; 3) Mixing liquid and gas. In the form of an airlift with air as the power source, a jet of entrained gas in the liquid stream, and the like. The hydraulic jet device using liquid as power source at present uses venturi tube principle to make the sucked air and liquid mix in the mixer, and this mode is the best oxygen dissolving effect. For the liquid-gas jet device, there are primary air suction type and secondary air suction type. In the oxygen transfer process of air and liquid, oxygen in the air is dissolved into the liquid as much as possible, and in theory, the volume ratio of the air to the liquid is one to one, the capacity of dissolving oxygen can reach the maximum value, and the oxygen in the excessive air cannot be dissolved to transfer oxygen. However, when the volume ratio of the air suction amount and the working liquid amount of the ejector is one to one, the working efficiency of the ejector is very low, and the energy efficiency is also relatively low. Therefore, how to improve the oxygen transfer efficiency of the jet device is always a problem which many engineering personnel are urgent to solve. Disclosure of Invention In order to solve the problem that the existing ejector has low oxygen transfer efficiency in the air, the scheme provides a liquid-gas ejector. The technical scheme adopted by the invention is as follows: a liquid-gas ejector comprising: the air suction tank is communicated with the air environment, and a first jet port is arranged at the bottom of the air suction tank; the jet nozzle connected with the outlet of the liquid inlet pipe is opposite to the first jet port, a first channel is arranged between the jet nozzle and the first jet port, and air in the air suction tank can be sucked into the first jet port from the first channel; The air and liquid are mixed in the throat to form a first gas-liquid mixed flow, and the outlet of the throat is a nozzle of the first gas-liquid mixed flow; the inlet of the guide cylinder is communicated with the liquid environment, and a second jet port is arranged in the guide cylinder; The first gas mixing flow and the liquid sucked in the second channel are mixed in the mixer to form a second gas-liquid mixing flow, and the second gas-liquid mixing flow is conveyed by the mixer. As an alternative structure or a supplementary design of the liquid-gas ejector, an air inlet pipe is arranged at the top or the side wall of the air suction tank, an air suction chamber is arranged in the air suction tank, when the liquid-gas ejector is used, the air suction tank is arranged on the liquid surface, the guide cylinder is immersed below the liquid surface, or all parts of the liquid-gas ejector except the inlet of the air inlet pipe are immersed below the liquid surface, and the air suction chamber is