Rapid cooling device and method for chemical laser tail gas

Abstract

The invention discloses a chemical laser tail gas top-speed cooling device and method. The device comprises a cold storage water tank, a micro-channel heat exchanger and a water pump. Before the laser is started, cooling water in the cold storage water tank enters the micro-channel heat exchanger through a water pump, and after the laser is started, high-temperature laser tail gas enters the micro-channel heat exchanger, is guided by a grid of the micro-channel heat exchanger and exchanges heat with the wall surface of the grid; and the micro-channel heat exchanger is subjected to heat dissipation treatment through circulating cooling water. According to the device, laser tail gas can be rapidly cooled to 350K from the emission temperature of 1300K in a limited space, the volume flow of the tail gas is effectively reduced, the efficiency of a tail gas emission system is improved, and the power-to-weight ratio and the power-to-body ratio of a pure electric drive type chemical laser system are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical laser tail gas heat exchange, and particularly relates to a device and method for rapidly cooling the tail gas of a chemical laser. Background Art

[0002] When a combustion-driven chemical laser operates, a certain vacuum environment needs to be maintained in the lasing cavity. The huge tail gas treatment system of the chemical laser has become an important factor restricting its application scenarios. Developing an electric-driven laser tail gas exhaust system is an important means to solve this problem.

[0003] Among them, reducing the temperature of the laser tail gas is an important measure to reduce the volume flow rate, thereby significantly reducing the power consumption, volume and weight of the electric-driven tail gas emission system. Summary of the Invention

[0004] In order to rapidly cool the tail gas of a chemical laser in a limited space, improve the electric-driven tail gas emission device and efficiency of a chemical laser, and improve the power-to-weight ratio of a chemical laser system, the present disclosure provides a device and method for rapidly cooling the tail gas of a chemical laser, which can realize the rapid cooling of the emission temperature of the laser tail gas from 1300K to 350K in a limited space.

[0005] The device for rapidly cooling the tail gas of a chemical laser provided by the present disclosure mainly includes: a chilled water storage tank (1), a microchannel heat exchanger (2), and a water pump;

[0006] The chilled water storage tank (1) is used to continuously supply cooling water to the microchannel heat exchanger (2);

[0007] The microchannel heat exchanger (2) includes a docking flange (2-1), a water inlet (2-2), a water outlet (2-3), a grille (2-4), a first water collection chamber (2-5), and a second water collection chamber (2-6);

[0008] The cooling water in the chilled water storage tank (1) enters the first water collection chamber (2-5) of the microchannel heat exchanger (2) through a water pump, and then returns to the chilled water storage tank after passing through the grille and the second water collection chamber in sequence;

[0009] The docking flange (2-1) of the microchannel heat exchanger (2) is connected to the tail gas emission outlet of the laser; the grille (2-4) is installed perpendicular to the gas flow direction; wherein:

[0010] The grille (2-4) includes a transverse grille (2-4-1) and a longitudinal grille (2-4-2). The transverse grille (2-4-1) is used to divert the tail gas of the laser, increasing the contact area between the high-temperature gas flow and the microchannel heat exchanger; the longitudinal grille (2-4-2) is arranged on the side wall of the transverse grille, and dense water flow channels are distributed therein, and the water flow channels are connected to the first water collection chamber (2-5) and the second water collection chamber (2-6).

[0011] Furthermore, a sealing groove structure is provided on the surface of the docking flange (2-1), and an O-ring is used to seal between the microchannel heat exchanger (2) and the exhaust gas outlet of the laser, so as to ensure the isolation between the laser exhaust gas and the ambient gas.

[0012] Furthermore, the aperture size of a single air flow channel of the microchannel heat exchanger is 8mm * 9mm, and the length along the air flow direction is 200mm;

[0013] The transverse grid (2-4-1) is an array of thin metal walls, which is used to strengthen the structural strength of the microchannel heat exchanger (2) under vacuum; the spacing thickness between the upper and lower layers of transverse grids is 2mm;

[0014] The size of the water flow channel of the longitudinal grid is 3mm in diameter.

[0015] Furthermore, the cold storage water tank (1) includes a cooling water inlet (1-2), a cooling water outlet (1-1), a diverter (1-3), a cold storage agent (1-4) and a partition (1-5);

[0016] The cooling water outlet (1-1) is connected to the water inlet (2-2) of the microchannel heat exchanger (2) through a pipeline;

[0017] The water outlet (2-3) of the microchannel heat exchanger (2) is connected to the diverter (1-3) of the cold storage water tank (1) through a pipeline, via the cooling water inlet (1-2) of the cold storage water tank (1);

[0018] The upper part of the diverter (1-3) of the cold storage water tank (1) is a pipeline for transporting the cooled water after circulation, and the lower part is provided with a diverter plate with dense small holes, which is used to divert the incoming cooling water to form a uniform water column;

[0019] A partition (1-5) is provided below the diverter plate, and the partition is densely provided with small holes. At the same time, the cold storage agent (1-4) is placed on the partition; after the cooled water after circulation is diverted by the diverter, it flows through the cold storage agent (1-4) to achieve temperature reduction.

[0020] Furthermore, the cold storage agent (1-4) adopts ice balls.

[0021] A method for rapidly cooling the exhaust gas of a chemical laser using the above device includes the following steps:

[0022] Before starting the laser, start the water pump to make the cooling water in the cold storage water tank (1) enter the microchannel heat exchanger (2);

[0023] After starting the laser, the high-temperature laser exhaust gas enters the microchannel heat exchanger (2) through the docking flange, is guided by the grid (2-4), and exchanges heat with the wall surface of the grid (2-4), and dissipates heat through the circulating cooling water;

[0024] The cooled cooling water after circulation returns to the chilled water storage tank and is cooled after flowing through the coolant (1-4).

[0025] Compared with the prior art, the beneficial effects of the present disclosure are as follows: (1) It can rapidly cool the chemical laser tail gas from 1300K to 350K in a limited space, thereby greatly reducing the volume flow rate of the tail gas, improving the efficiency of the tail gas emission system, and further increasing the power-to-weight ratio and power-to-volume ratio of the pure electric drive chemical laser system; (2) According to the different operating durations of the laser, the coolant can be increased or decreased according to the actual situation; (3) The structural design is flexible, and the flow channel design size of the microchannel heat exchanger can be increased or decreased according to the different operating powers and flow rates of the laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] By describing the exemplary embodiments of the present disclosure in more detail in conjunction with the accompanying drawings, the above and other objects, features, and advantages of the present disclosure will become more apparent. Among them, in the exemplary embodiment mode of the present disclosure, the same reference numerals generally represent the same components.

[0027] Figure 1 It is a schematic diagram of a rapid cooling device for chemical laser tail gas according to the present disclosure;

[0028] Figure 2 It is a structural diagram of an exemplary microchannel heat exchanger;

[0029] In the figure, where: 1 is the chilled water storage tank, 1-1 is the cooling water outlet, 1-2 is the cooling water inlet, 1-3 is the diverter, 1-4 is the coolant, and 1-5 is the partition;

[0030] 2 is the microchannel heat exchanger, 2-1 is the docking flange, 2-2 is the water inlet, 2-3 is the water outlet, 2-4 is the grille, 2-4-1 is the horizontal grille, 2-4-2 is the vertical grille, 2-4-3 is the dense cooling water flow channel, 2-5 is the first water collection chamber, and 2-6 is the second water collection chamber;

[0031] 3 is the laser tail gas outlet. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0033] The present disclosure provides a rapid cooling device and method for chemical laser tail gas. The structure of an exemplary embodiment according to the present disclosure is as shown in the attached Figure 1 and 2As shown, it mainly includes:

[0034] A chilled water storage tank (1), a microchannel heat exchanger (2), and a water pump.

[0035] The chilled water storage tank (1) includes a cooling water inlet (1-2), a cooling water outlet (1-1), a diverter (1-3), a refrigerant (1-4), and a partition (1-5);

[0036] The microchannel heat exchanger (2) includes a butt flange (2-1), a water inlet (2-2), a water outlet (2-3), a grille (2-4), a first water collection chamber (2-5), and a second water collection chamber (2-6). The cooling water in the chilled water storage tank (1) enters the first water collection chamber (2-5) of the microchannel heat exchanger (2) through the water pump and circulates.

[0037] Before starting the laser, first start the water pump to make the cooling water in the chilled water storage tank (1) enter the microchannel heat exchanger (2). The microchannel heat exchanger (2) is connected to the laser tail gas discharge outlet through the butt flange (2-1). The surface of the butt flange (2-1) is provided with a sealing groove structure, and the seal between the microchannel heat exchanger (2) and the laser tail gas discharge outlet is achieved through an O-ring, which can ensure the isolation between the laser tail gas and the ambient gas.

[0038] After starting the laser, the high-temperature laser tail gas enters the microchannel heat exchanger (2), is guided by the grille (2-4) of the microchannel heat exchanger (2), and then exchanges heat with the wall surface of the grille (2-4), and the microchannel heat exchanger (2) is cooled by circulating water.

[0039] Considering that when the laser tail gas flows through the microchannel heat exchanger (2), the pressure loss should be minimized as much as possible. The size of a single gas flow channel is preferably designed to be 8mm * 9mm, and the length of the microchannel heat exchanger along the gas flow direction is 200mm.

[0040] The grille (2-4) of the microchannel heat exchanger (2) is installed perpendicular to the gas flow direction.

[0041] The grille (2-4) includes a transverse grille (2-4-1) and a longitudinal grille (2-4-2). The transverse grille (2-4-1) is an array of thin metal walls. In this embodiment, the thickness of the transverse grille (2-4-1) is 2mm, which is used to strengthen the structural strength of the microchannel heat exchanger under vacuum. At the same time, the transverse grille (2-4-1) can play a role in guiding the flow, increasing the contact area between the high-temperature gas flow and the microchannel heat exchanger, and improving the heat transfer efficiency. The longitudinal grille (2-4-2) is distributed with dense water flow channels. In this embodiment, considering the heat transfer efficiency and the reliability of the device, the size of the water flow channels is preferably 3mm in diameter. The water flow channels are connected to the first water collection chamber (2-5) and the second water collection chamber (2-6).

[0042] When the laser operates, the chemical laser tail gas rapid cooling device provided in this embodiment performs real-time cooling on the high-temperature laser tail gas. The laser tail gas exchanges heat with the wall surface of the grille (2-4), and the microchannel heat exchanger (2) is dissipated by circulating water.

[0043] The water outlet (2-3) and water inlet (2-2) of the microchannel heat exchanger (2) are respectively placed on the upper and lower sides. One end of the water inlet (2-2) is connected to the cooling water outlet (1-1) of the cold storage water tank (1) through a pipeline, and the other end is connected to the first water collecting cavity (2-5) of the microchannel heat exchanger. The water outlet (2-3) of the microchannel heat exchanger is connected to the diverter (1-3) of the cold storage water tank (1) through a pipeline.

[0044] The upper part of the diverter (1-3) of the cold storage water tank (1) is a pipeline for transporting the cooled water after circulation, which is connected to the water outlet (2-3) of the microchannel heat exchanger; the lower part is composed of a diverter plate with dense small holes. The cooled water after circulation forms a uniform water column after passing through the diverter (1-3), and is cooled after flowing through the cold storage agent (1-4). The partition plate (1-5) of the cold storage water tank (1) is densely covered with small holes, and the cold storage agent (1-4) is placed on the partition plate (1-5). The cold storage agent (1-4) can adopt ice balls.

[0045] According to the different operating durations of the laser, the cold storage agent (1-4) can be increased or decreased according to the actual situation.

[0046] According to the different operating powers and flow rates of the laser, the microchannel heat exchanger can increase or decrease the design size of the flow channel.

[0047] This embodiment can rapidly cool the chemical laser tail gas from 1300K to 350K in a limited space, thereby greatly reducing the volume flow rate of the tail gas, improving the efficiency of the tail gas emission system, and further improving the power-to-weight ratio and power-to-volume ratio of the pure electric drive chemical laser system.

[0048] The above technical solutions are only exemplary embodiments of the present invention. For those skilled in the art, based on the application methods and principles disclosed in the present invention, it is very easy to make various types of improvements or deformations, not limited to the methods described in the above specific embodiments of the present invention. Therefore, the above-described manner is only preferred and does not have a restrictive meaning.

Claims

1. A chemical laser exhaust gas rapid cooling device, characterized in that: include: A cold water storage tank (1), a microchannel heat exchanger (2) and a water pump; The cold storage water tank (1) is used to continuously supply cooling water to the microchannel heat exchanger (2); The microchannel heat exchanger (2) comprises a docking flange (2-1), a water inlet (2-2), a water outlet (2-3), a grid (2-4), a first water collecting chamber (2-5) and a second water collecting chamber (2-6); The cooling water in the cold storage water tank (1) enters the first water collecting chamber (2-5) of the microchannel heat exchanger (2) through a water pump, and then passes through the grid and the second water collecting chamber in sequence before returning to the cold storage water tank; The butt flange (2-1) of the microchannel heat exchanger (2) is connected to the exhaust outlet of the laser; the grid (2-4) is installed perpendicular to the gas flow direction; wherein: The grid (2-4) comprises a transverse grid (2-4-1) and a longitudinal grid (2-4-2); the transverse grid (2-4-1) is used to guide the laser exhaust gas and increase the contact area between the high-temperature gas flow and the microchannel heat exchanger; the longitudinal grid (2-4-2) is arranged on the side wall of the transverse grid and has dense water flow channels distributed therein, and the water flow channels are connected to the first water collecting chamber (2-5) and the second water collecting chamber (2-6).

2. The device according to claim 1, characterized in that The surface of the docking flange (2-1) is provided with a sealing groove structure, and the sealing between the microchannel heat exchanger (2) and the laser exhaust gas discharge outlet is achieved through an O-ring, so as to ensure the isolation between the laser exhaust gas and the ambient gas.

3. The device according to claim 1, characterized in that The diameter of a single airflow channel of the microchannel heat exchanger is 8mm*9mm, and the length along the airflow direction is 200mm; The transverse grid (2-4-1) is a metal thin-wall array, which is used to enhance the structural strength of the microchannel heat exchanger (2) under vacuum; the spacing thickness between the upper and lower transverse grids is 2 mm; The longitudinal grid water flow channel has a diameter of 3 mm.

4. The device according to any one of claims 1 to 3, characterized in that: The cold storage water tank (1) comprises a cooling water inlet (1-2), a cooling water outlet (1-1), a flow divider (1-3), a cold storage agent (1-4) and a partition (1-5); The cooling water outlet (1-1) is connected to the water inlet (2-2) of the microchannel heat exchanger (2) through a pipeline; The water outlet (2-3) of the microchannel heat exchanger (2) is connected to the flow divider (1-3) of the cold storage water tank (1) through a pipeline, via the cooling water inlet (1-2) of the cold storage water tank (1); The upper part of the flow divider (1-3) of the cold storage water tank (1) is a cooling water transportation pipeline after circulation, and the lower part is provided with a flow divider plate with dense holes, which is used to divide the incoming cooling water to form a uniform water column; A partition (1-5) is provided below the diverter plate, and the partition is densely covered with small holes. Meanwhile, a refrigerant (1-4) is placed on the partition. After the circulating cooling water is diverted by the diverter, it flows through the refrigerant (1-4) to achieve cooling.

5. The device according to claim 4, characterized in that The coolant (1-4) is an ice ball.

6. A method for rapidly cooling chemical laser exhaust gas using the device described in any one of claims 1 to 5, comprising the following steps: Before turning on the laser, turn on the water pump to allow the cooling water in the cold storage water tank (1) to enter the microchannel heat exchanger (2); After the laser is turned on, the high-temperature laser exhaust gas enters the microchannel heat exchanger (2) through the docking flange, is guided by the grid (2-4), and exchanges heat with the wall surface of the grid (2-4), and dissipates heat through circulating cooling water; The circulated cooling water returns to the cold storage water tank and is cooled after flowing through the cold storage agent (1-4).

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