Slurry degassing device

Abstract

The utility model provides a slurry degassing device which comprises a horizontal cylinder, an evacuation opening connected with a vacuum pump is formed in the top of the horizontal cylinder, a slurry outlet is formed in the bottom of the horizontal cylinder, and a slurry pipeline connected with an external slurry conveying pipeline is arranged in the horizontal cylinder. A slurry inlet is formed in the position, close to the cylinder wall of the horizontal cylinder, of the slurry pipeline, a first diffusion nozzle is installed at the bottom of the slurry pipeline, and multiple layers of ultrasonic oscillation assemblies which are arranged in a staggered mode are arranged below the slurry pipeline. By arranging the first diffusion nozzle and the multi-layer ultrasonic oscillation assembly, the thickness of a liquid film when slurry flows in the device is reduced, and meanwhile, the solubility of gas in the slurry can be reduced in an auxiliary vacuumizing mode; by arranging the ultrasonic oscillation assembly, gas is promoted to oscillate in the slurry to form bubbles, the gas is promoted to overflow quickly, and a traditional slurry degassing mode adopting a chemical method and a physical method is effectively replaced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste liquid treatment, in particular to a slurry degassing device. Background Art

[0002] There are a large number of waste slurries in the chemical and energy sectors. These slurries generally have a certain temperature and contain salt, particulate matter, and dissolved air or other process gases, such as carbon dioxide and sulfur dioxide. In the application of steam mechanical recompression slurry concentration / crystallization technology and slurry flash exhaust steam waste heat recovery technology, if the water vapor evaporated or flashed from the slurry is mixed with a certain amount of non-condensable gas, the condensation pressure of the water vapor will increase and the condensation heat transfer coefficient of the water vapor will decrease. Experimental data shows that even if the content of non-condensable gas in the water vapor is only 1%, it will cause the steam condensation heat transfer coefficient to decrease by 60%. The increase in condensation pressure will lead to an increase in the outlet pressure of the compressor, a decrease in transmission efficiency, and an increase in power consumption; the decrease in condensation heat transfer effect will lead to a significant decrease in the waste heat recovery capacity and thermal efficiency of the system.

[0003] In addition, the gas dissolved in the slurry will precipitate due to pressure drop during slurry transportation, causing corrosion and air blockage, reducing transportation efficiency and even damaging the transport pump; in the food processing field, the oxygen dissolved in the fruit pulp will affect food quality.

[0004] Currently, there are two methods for degassing liquids: chemical and physical. Chemical methods remove gases by adding reagents to the liquid to react with the gases. Physical methods include air dilution, vacuum decompression, and membrane separation. Air dilution involves blowing air into the liquid to reduce the partial pressure of non-condensable gases in the water, thereby incorporating a certain amount of non-condensable gases into the air leaving the liquid. Vacuum decompression exploits the relationship between pressure and gas solubility: when pressure decreases, the solubility of the gas decreases, allowing the gas to be separated. Membrane separation degasses gases by using the principle that a pressure differential allows only smaller gas molecules to pass through the membrane. In recent years, ultrasonic vibration and cyclone degassing technologies have also emerged. Ultrasonic methods use the positive and negative pressure phases of ultrasound to generate a large number of vacuum microbubbles in the liquid. These microbubbles absorb gas to form bubbles, which then grow and expand and are discharged from the liquid surface. Cyclone degassing takes advantage of the large density difference between liquid and gas, exploiting the fact that the centrifugal force of the liquid is much greater than that of the gas, to achieve gas separation.

[0005] Chinese patent publication number CN105194910A uses a cyclone separator and a vacuum method to degas liquid, and proposes a degassing conveying system including a raw liquid tank, a cyclone separator, and an infusion pump that delivers liquid from the raw liquid tank to the inlet of the cyclone separator. The infusion pump is a positive displacement pump.

[0006] Chinese patent publication number CN102210945A uses an umbrella-shaped slope and high vacuum to degas the acid bath solution, proposing a special degassing device that effectively solves the problem of rubber block clogging in existing sieve plate structure degassing devices.

[0007] Existing technologies for removing gases from high-volume, unstable slurries containing particulate matter are either ineffective, unstable, or too expensive. Chemical methods require the addition of large amounts of reagents, which is prohibitively expensive. Membrane separation methods have too small pores to process slurries containing particulate matter. Blast dilution methods require bulky equipment and are unsuitable for closed-system processes. When treating flowing slurries, cyclonic flow methods have poor adaptability to variable flow conditions and are prone to liquid carryover at the outlet. Utility Model Content

[0008] The purpose of the utility model is to provide a slurry degassing device to solve the above technical problems.

[0009] The utility model provides a slurry degassing device, comprising a horizontal cylinder, wherein the top of the horizontal cylinder is provided with an evacuation port connected to a vacuum pump, the bottom of the horizontal cylinder is provided with a slurry outlet, the interior of the horizontal cylinder is provided with a slurry pipe connected to an external slurry conveying pipeline, the slurry pipe is provided with a slurry inlet near the cylinder wall of the horizontal cylinder, a first diffusion nozzle is installed at the bottom of the slurry pipe, and multiple layers of staggered ultrasonic oscillation components are provided below the slurry pipe.

[0010] Furthermore, a gap is left between the side edge of the ultrasonic vibration plate assembly close to the horizontal cylinder wall and the horizontal cylinder wall.

[0011] Furthermore, a baffle fixedly mounted on the cylinder wall of the horizontal cylinder is provided above the slurry inlet.

[0012] Furthermore, the ultrasonic oscillation component is composed of multiple groups of ultrasonic transducers and a liquid pan, the ultrasonic transducer is installed at the bottom of the liquid pan, the liquid pan is connected to the horizontal cylinder through the supporting ribs below, the liquid pan is located below the slurry pipe, and a gap is left between the side edge of the liquid pan close to the wall of the horizontal cylinder and the wall of the horizontal cylinder.

[0013] Furthermore, a vent pipe passing through the liquid pan is installed on the liquid pan.

[0014] Furthermore, the ultrasonic oscillation assembly is composed of multiple groups of ultrasonic transducers and a ridge board. The ultrasonic transducers are installed at the bottom of the ridge board, and the ridge board is connected to the horizontal cylinder through supporting ribs below.

[0015] Furthermore, a liquid storage pan is installed between the ridge plate and the slurry pipe and is horizontally arranged on the wall of the horizontal cylinder. A plurality of second diffusion nozzles are installed at the bottom of the liquid storage pan.

[0016] Furthermore, the first diffusion nozzle and the second diffusion nozzle include a short tube and a diffusion cone, and the diffusion cone is coaxially arranged with the short tube and installed below the short tube through a fixing rib.

[0017] Furthermore, the evacuation port is connected to a gas collecting pipe installed inside the horizontal cylinder, and a condensing coil is provided on the gas collecting pipe. The water inlet pipe and the water outlet pipe of the condensing coil respectively pass through the horizontal cylinder and are connected to the external cooling water supply pipe and cooling water return pipe.

[0018] Furthermore, a flushing pipe is installed in the gas collecting pipe, a flushing nozzle is installed on the side wall of the flushing pipe near the condensing coil, and the flushing pipe passes through the horizontal cylinder and is connected to an external water pump.

[0019] The utility model reduces the thickness of the liquid film when the slurry flows inside the device by arranging a first diffusion nozzle and a multi-layer ultrasonic oscillation component, and at the same time, assists in vacuuming to reduce the solubility of the gas in the slurry; by arranging the ultrasonic oscillation component, the gas oscillation is promoted to form bubbles in the slurry, which prompts the gas to overflow quickly, effectively replacing the traditional slurry degassing method using chemical and physical methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a structural diagram of Example 1 of the present utility model;

[0022] Figure 2 This is an internal structure diagram of Example 1 of the present utility model;

[0023] Figure 3 This is a structural diagram of the diffusion nozzle of the utility model;

[0024] Figure 4 This is a structural diagram of Example 2 of the present utility model;

[0025] Figure 5 This is an internal structure diagram of Example 2 of the present utility model;

[0026] Figure 6 This is a schematic structural diagram of Example 3 of the present utility model;

[0027] Figure 7 This is an internal structure diagram of Example 3 of the present utility model;

[0028] Description of reference numerals:

[0029] In the figure: 1- horizontal cylinder, 11- evacuation port, 12- slurry outlet, 13- base, 2- slurry pipeline, 21- slurry inlet, 3- first diffuser nozzle, 31- short pipe, 32- diffuser cone, 33- fixed rib, 4- baffle, 5- liquid tray, 51- vent pipe, 6- liquid storage tray, 61- second diffuser nozzle, 7- ridge plate, 8- gas collecting pipe, 81- water inlet pipe, 82- water outlet pipe, 83- flushing pipe; DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0033] Example 1

[0034] like Figure 1-Figure 3 As shown:

[0035] A slurry degassing device comprises a horizontal cylinder 1. Both ends of the horizontal cylinder 1 are provided with heads or sealing plates to form a closed space. A base 13 is provided below the horizontal cylinder 1.

[0036] The top of the horizontal cylinder 1 is provided with an evacuation port 11 connected to a vacuum pump for extracting gas, and the bottom of the horizontal cylinder 1 is provided with a slurry outlet 12 for discharging the degassed slurry.

[0037] A slurry pipe 2 connected to an external slurry conveying pipeline is provided inside the horizontal cylinder 1. In this embodiment, a slurry pipe 2 is provided, and a slurry inlet 21 is provided on the upper side of the slurry pipe 2 inside the horizontal cylinder 1. The slurry inlet 21 is opened at a position where the slurry pipe 2 is close to the wall of the horizontal cylinder 1.

[0038] The slurry inlet 21 is provided as a plurality of evenly arranged circular openings or flat rectangular openings, so that the slurry forms a wall-adhering flow on the outer side of the slurry pipe 2 close to the inner wall of the horizontal cylinder 1 .

[0039] A sewage outlet is provided at the bottom of the slurry pipeline 2 to prevent slurry from accumulating in the pipeline.

[0040] A first diffusion nozzle 3 is installed at the sewage outlet. The first diffusion nozzle 3 is provided to reduce the impact force of the slurry when it is discharged through the sewage outlet, thereby reducing the impact of the slurry on the bottom.

[0041] A baffle 4 fixedly mounted on the wall of the horizontal cylinder 1 is provided above the slurry pipe 2 , and the side edge of the baffle 4 is directly connected to the wall of the horizontal cylinder 1 to prevent the slurry discharged from the slurry outlet 12 from splashing into the evacuation port 11 .

[0042] A plurality of staggeredly arranged ultrasonic oscillation components are provided below the slurry pipeline 2 .

[0043] A gap is left between the side edge of the ultrasonic oscillation plate assembly close to the wall of the horizontal cylinder 1 and the wall of the horizontal cylinder 1 .

[0044] In this embodiment, the ultrasonic oscillation assembly consists of multiple groups of ultrasonic transducers and a liquid pan 5. The ultrasonic transducer is installed at the bottom of the liquid pan 5. The liquid pan 5 is connected to the horizontal cylinder 1 through the supporting ribs below. The liquid pan 5 is located below the first diffusion nozzle 3 of the slurry pipe 2. Cofferdams are provided on both sides of the liquid pan 5 near the inner wall of the horizontal cylinder 1. A gap is left between the side edge of the liquid pan 5 near the wall of the horizontal cylinder 1 and the wall of the horizontal cylinder 1.

[0045] like Figure 1 and Figure 2As shown, a gap of 15-30 mm is left between the left edge of the uppermost liquid pan 5 located near the first diffuser nozzle 3 and the inner wall of the horizontal cylinder 1, so that a wall-adhering flow of a certain thickness is formed below the gap, and the right edge is at the height above the weir of the open channel weir flow from the inner wall of the horizontal cylinder 1.

[0046] The combination of the liquid pan 5 and the ultrasonic transducer can accelerate the removal of dissolved gas in the slurry.

[0047] In this embodiment, the liquid pan 5 is provided with three layers, each layer is arranged horizontally, and the three layers of liquid pans 5 are arranged in a staggered manner to facilitate the back-and-forth flow of the slurry. The layer spacing between adjacent liquid pans 5 is greater than the height of the weir on the liquid pan 5 and a certain amount of gas side space is reserved to facilitate the flow of gas released from the slurry.

[0048] A vent pipe 51 penetrating the liquid pan 5 is installed on the liquid pan 5 , and the vent pipe 51 is evenly arranged along the length direction of the horizontal cylinder 1 .

[0049] The bottom surface of the vent pipe 51 is flush with the bottom surface of the liquid pan 5 , and the top surface of the vent pipe 51 is higher than the top surface of the liquid pan 5 and passes through the liquid surface above the liquid pan 5 .

[0050] The ventilation pipe 51 is provided to facilitate the transmission of the lower layer gas to the space above the horizontal cylinder 1.

[0051] like Figure 3 As shown, the first diffusion nozzle 3 includes a short tube 31 and a diffusion cone 32 . The diffusion cone 32 is coaxially arranged with the short tube 31 and is installed below the short tube 31 through a fixing rib 33 . The short tube 31 of the first diffusion nozzle 3 is connected to the slurry pipeline 2 .

[0052] The maximum outer diameter of the diffusion cone 32 is 1-2 times the inner diameter of the short tube 31 , and the maximum height of the diffusion cone 32 is 0.5-1.5 times the inner diameter of the short tube 31 .

[0053] Below the evacuation port 11, there is an air collecting pipe 8 installed inside the horizontal cylinder 1. A condensing coil is provided on the air collecting pipe 8. The water inlet pipe 81 and the water outlet pipe 82 of the condensing coil respectively pass through the horizontal cylinder 1 and are connected to the external cooling water supply pipeline and cooling water return pipeline.

[0054] By setting up a condensing coil to condense the water vapor contained in the gas, the amount of air required by the vacuum pump can be reduced, and the air pumping capacity of the vacuum pump can be increased.

[0055] A flushing pipe 83 is installed in the gas collecting pipe 8. A flushing nozzle is installed on the side wall of the flushing pipe 83 near the condensing coil. The flushing nozzles are staggered on the flushing pipe 83. The flushing pipe 83 passes through the horizontal cylinder 1 and is connected to an external water pump.

[0056] The dirt on the condensing coil can be flushed away by setting a flushing nozzle to ensure the condensing efficiency of the condensing coil.

[0057] The gas containing water vapor enters the gas collecting pipe 8 and passes through the condensing coil into the evacuation port 11. The gas collecting pipe 8 and the evacuation port 11 can be arranged horizontally or tilted upward or vertically upward to prevent slurry or condensed water from entering the evacuation port 11.

[0058] Working process: Part of the slurry in the slurry pipe 2 flows out through the slurry inlet 21, and the other part flows out through the first diffusion nozzle 3. The slurry flowing out of the slurry outlet 12 is blocked by the inner wall of the horizontal cylinder 1 and the baffle 4 to form a wall-adhering flow and then flows into the liquid pan 5 of the ultrasonic oscillation component. The other part directly diffuses and flows into the liquid pan 5. After the ultrasonic oscillation of the uppermost liquid pan 5, part of the gas is removed and floats up into the gas collecting pipe 8. The slurry flows into the lower layer from both sides of the liquid pan 5. The second layer of liquid pan 5 also undergoes ultrasonic oscillation to remove the gas. The gas can float up through the vent pipe 51 or float up in the space between adjacent liquid pans 5 and enter the gas collecting pipe 8. Similarly, the slurry enters the lower layer for degassing. By setting the first diffusion nozzle 3 and multi-layer ultrasonic oscillation components, the liquid film thickness of the slurry is reduced when it flows inside the device. At the same time, by assisting with vacuum extraction, the solubility of the gas in the slurry can be reduced; by setting the ultrasonic oscillation component, the gas oscillation is promoted to form bubbles in the slurry, which prompts the gas to overflow quickly, effectively replacing the traditional slurry degassing methods using chemical and physical methods.

[0059] Example 2

[0060] like Figure 4 and Figure 5 As shown, two symmetrical slurry pipes 2 are provided in this embodiment. The structure of the slurry pipes 2 is the same as that of embodiment 1. The baffles 4 are provided in conjunction with the corresponding slurry pipes 2, and the two baffles 4 are also symmetrically provided.

[0061] In this embodiment, corresponding liquid pans 5 are respectively arranged under the two slurry pipes 2. A gap is left between the two uppermost liquid pans 5. The net distance between the two liquid pans 5 is twice the height of the weir of the open channel weir flow.

[0062] The distance between the two sides of the liquid pan 5 located at the second layer and the inner wall of the horizontal cylinder 1 is the height above the weir of the open channel weir flow.

[0063] The difference between the series flow of slurry in this embodiment and that in Example 1 is that the flow in this embodiment is arranged in parallel, so that the slurry flow is divided into two parts, and each flow returns to flow in the vertically arranged liquid pan 5, so that the liquid level height (or liquid film thickness) of the slurry when flowing inside the device is halved, and at the same time the slurry flow time is reduced, further improving the degassing efficiency.

[0064] Example 3

[0065] like Figure 6 and Figure 7As shown, the ultrasonic oscillation assembly in this embodiment is composed of multiple groups of ultrasonic transducers and a ridge plate 7. The ultrasonic transducers are installed at the bottom of the ridge plate 7, and the ridge plate 7 is connected to the horizontal cylinder 1 through the supporting ribs below.

[0066] Two liquid storage pans 6 are installed horizontally on the wall of the horizontal cylinder 1 between the ridge plate 7 and the slurry pipe 2. The liquid storage pans 6 are symmetrically arranged. The liquid storage pans 6 are used to store the slurry flowing out of the slurry pipe 2. A plurality of second diffusion nozzles 61 are evenly installed at the bottom of the liquid storage pans 6. The second diffusion nozzles 61 can disperse the slurry in the liquid storage pans 6 to the space below, thereby reducing the thickness of the liquid film and accelerating the removal of dissolved gas in the slurry.

[0067] The second diffusion nozzle 61 includes a short tube 31 and a diffusion cone 32. The diffusion cone 32 is coaxially arranged with the short tube 31 and is installed below the short tube 31 through a fixing rib 33. The top end of the short tube 31 of the second diffusion nozzle 61 passes through the liquid storage tray 6 and is flush with the top surface of the liquid storage tray 6.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A slurry degassing device, characterized in that It includes a horizontal cylinder, the top of which is provided with an evacuation port connected to a vacuum pump, the bottom of which is provided with a slurry outlet, the inside of which is provided with a slurry pipe connected to an external slurry conveying pipeline, the slurry pipe having a slurry inlet close to the wall of the horizontal cylinder, a first diffusion nozzle installed at the bottom of the slurry pipe, and multiple layers of staggered ultrasonic oscillation components arranged below the slurry pipe.

2. The slurry degassing device according to claim 1, characterized in that: A gap is left between the side edge of the ultrasonic vibration plate assembly close to the horizontal cylinder wall and the horizontal cylinder wall.

3. The slurry degassing device according to claim 1, characterized in that: A baffle fixedly mounted on the cylinder wall of the horizontal cylinder is provided above the slurry inlet.

4. The slurry degassing device according to claim 2, characterized in that: The ultrasonic oscillation assembly consists of multiple groups of ultrasonic transducers and a liquid pan. The ultrasonic transducer is installed at the bottom of the liquid pan. The liquid pan is connected to the horizontal cylinder through the supporting ribs below. The liquid pan is located below the slurry pipe. A gap is left between the side edge of the liquid pan close to the wall of the horizontal cylinder and the wall of the horizontal cylinder.

5. The slurry degassing device according to claim 4, characterized in that: A vent pipe that passes through the liquid pan is installed on the liquid pan.

6. The slurry degassing device according to claim 2, characterized in that: The ultrasonic oscillation assembly is composed of multiple groups of ultrasonic transducers and a ridge board. The ultrasonic transducers are installed at the bottom of the ridge board, and the ridge board is connected to the horizontal cylinder through the supporting ribs below.

7. The slurry degassing device according to claim 6, characterized in that: A liquid storage pan horizontally arranged on the wall of the horizontal cylinder is installed between the ridge plate and the slurry pipeline, and a plurality of second diffusion nozzles are installed at the bottom of the liquid storage pan.

8. The slurry degassing device according to claim 1, characterized in that: The first diffusion nozzle includes a short tube and a diffusion cone. The diffusion cone is coaxially arranged with the short tube and is installed below the short tube through fixing ribs.

9. The slurry degassing device according to claim 1, characterized in that: The evacuation port is connected to a gas collecting pipe installed inside the horizontal cylinder. A condensing coil is provided on the gas collecting pipe. The water inlet pipe and the water outlet pipe of the condensing coil respectively pass through the horizontal cylinder and are connected to the external cooling water supply pipe and cooling water return pipe.

10. The slurry degassing device according to claim 9, characterized in that: A flushing pipe is installed in the gas collecting pipe, and a flushing nozzle is installed on the side wall of the flushing pipe near the condensing coil. The flushing pipe passes through the horizontal cylinder and is connected to an external water pump.

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