Flash apparatus and decarburization method of carbonate solution

Abstract

The present application relates to the technical field of equipment safety, and discloses a flash evaporation device and a decarburization method of carbonate solution. The flash evaporation device comprises a flash evaporation tank and a feed inlet arranged at the top of the flash evaporation tank. The feed inlet comprises a cone (2) and a stirring device with spiral blades arranged inside the cone. A reinforcing rib plate (1) is arranged outside the cone (2). A support pipe (6) is arranged at the central axis of the cone (2). An inclined flow guide plate (3) and a vertical flow guide plate (4) are arranged between the cone (2) and the support pipe (6). A flange (7) is connected to the top of the cone (2) through a connecting pipe (5). The flash evaporation device avoids the serious damage of high-speed gas-liquid two-phase flow to the steel plate and solves the problem of strong vibration of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of equipment safety, in particular to a flash evaporation device and a decarbonization method of carbonate solution. BACKGROUND

[0002] In the decarbonization unit, the flash evaporation device is mainly used for flash regeneration of the carbonate solution absorbing carbon dioxide. In the flash evaporation tank, the carbon dioxide absorbed by the carbonate is released with the pressure reduction, thereby being separated from the carbonate solution. After the flash evaporation, the carbonate solution returns to the absorption tower to continue absorbing carbon dioxide. In the current flash evaporation process, due to the pressure reduction in the process of desorption, the volume of the flash evaporated vapor-liquid mixture expands to about five times of the original volume, and the flash evaporation tank will vibrate violently. In the state of continuous production, the equipment near the flash evaporation vapor outlet is easily broken due to the continuous impact force, which seriously affects the normal production. SUMMARY

[0003] The present application aims to overcome the problems of the prior art, such as the severe damage of high-speed gas-liquid two-phase flow in the flash evaporation device to the steel plate and the strong vibration of the equipment, and provides a flash evaporation device and a decarbonization method of carbonate solution. The flash evaporation device makes the material pass through the spiral flow distribution, not only releases the huge energy in rotation, but also expands the contact area of the liquid and the gas, so that the liquid is fully flash evaporated, thereby avoiding the severe damage of high-speed gas-liquid two-phase flow in the flash evaporation device to the steel plate and solving the problem of the strong vibration of the equipment.

[0004] In order to achieve the above-mentioned purpose, the present application provides a flash evaporation device, which comprises a flash evaporation tank and a feed inlet arranged at the top of the flash evaporation tank. The feed inlet comprises a cone and a stirring device with spiral blades arranged in the cone. A reinforcing rib plate is arranged on the outside of the cone. A support pipe is arranged on the central axis of the cone. Inclined guide plates and vertical guide plates are arranged between the cone and the support pipe. A flange is connected to the top of the cone through a connecting pipe.

[0005] Preferably, a reinforcing ring is arranged on the outside of the connecting pipe.

[0006] Preferably, the inclined guide plates and the vertical guide plates are arranged at intervals.

[0007] Preferably, the number of the inclined guide plates is 3-30.

[0008] Preferably, the angle between the inclined guide plates and the flash evaporation tank is 5-45°.

[0009] Preferably, the number of the vertical guide plates is 3-30.

[0010] Preferably, the number of the reinforcing rib plates is 3-30.

[0011] Preferably, the number of the reinforcing rib plates, the inclined flow guide plates and the vertical flow guide plates are equal and arranged at intervals.

[0012] Preferably, the shape of the inclined flow guide plate is a right trapezoid or a sector.

[0013] Preferably, the shape of the vertical flow guide plate is a rectangle or a square.

[0014] The second aspect of the present application provides a decarbonization method of a carbonate solution, which comprises: adding a carbonate solution absorbing carbon dioxide into the flash evaporation equipment to perform decarbonization treatment.

[0015] Through the above technical solution, the liquid enters the flash evaporation equipment through the spiral blade, and the vertical flow guide plate and the inclined flow guide plate with special shape and angle are designed to make the gas-liquid two-phase flow rotate and disperse, not only to release the huge energy rotation, but also to expand the contact area of the liquid and the gas, so that the liquid is fully flashed, so as to avoid the serious damage of the high-speed gas-liquid two-phase flow in the flash evaporation tank to the steel plate, and also solve the problem of strong vibration of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic view of the flash evaporation equipment.

[0017] Figure 2 is a sectional structural schematic view of the feed inlet of the flash evaporation equipment.

[0018] REFERENCE NUMERALS

[0019] 1, reinforcing rib plate; 2, cone; 3, inclined flow guide plate; 4, vertical flow guide plate; 5, connecting pipe; 6, supporting pipe; 7, connecting flange; 8, reinforcing ring. DETAILED DESCRIPTION

[0020] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0021] The endpoints of the ranges and any values disclosed herein are not limited to the precise values stated. The endpoints of the ranges and any values are understood to be approximate values. The exact numerical values of the endpoints of the ranges and any values are understood to be approximate values. The endpoints of the ranges and any values can be combined with one another to form one or more new ranges or values, which are to be understood as being specifically included in the present application, even if not expressly stated.

[0022] As Figure 1As shown, the flash tank and the feed inlet provided at the top of the flash tank are included in the flash equipment according to the present application, the feed inlet includes a cone 2 and a stirring device with spiral blades provided inside the cone, a reinforcing rib plate 1 is provided outside the cone 2, a support pipe 6 is provided at the central axis of the cone 2, an inclined guide plate 3 and a vertical guide plate 4 are provided between the cone 2 and the support pipe 6, and a flange 7 is connected to the top of the cone 2 through a connecting pipe 5. According to the flash equipment of the present application, the liquid is distributed by the spiral blades, and the vertical guide plate and the inclined guide plate with special shape and angle design make the gas-liquid two-phase flow rotate and disperse, and the huge energy is released in rotation, so as to avoid the equipment from being broken due to the continuous impact force, even affect the normal production, and solve the problem of strong vibration of the equipment; and the contact area of the liquid and the gas is expanded, so that the liquid is fully flashed.

[0023] In the flash equipment according to the present application, the flash tank is a conventional device in the art, and the embodiments of the present application do not make a detailed description. The number of the feed inlets provided at the top of the flash tank can be more than one, for example, 1, 2, 3, 4 or more. Considering the efficiency and cost of flashing, the number of the feed inlets is preferably 2. The ratio of the diameter of the feed inlet to the width of the flash tank can be 1:(8-15), preferably 1:(10-12), for example, 1:8, 1:10, 1:12, 1:14 or 1:15. The diameter of the feed inlet can be DN100-DN900, preferably DN300-DN400. The width of the flash tank can be 1000mm-10000mm, preferably 3000mm-5000mm.

[0024] In the flash equipment according to the present application, in order to ensure the strength and rigidity of the feed inlet and improve the impact resistance, the material of the reinforcing rib plate 1 is preferably at least one of carbon fiber, steel bar and glass fiber, the shape of the reinforcing rib plate 1 is preferably trapezoidal, the upper base of the reinforcing rib plate 1 is preferably 20mm-100mm, the lower base of the reinforcing rib plate 1 is preferably 50mm-200mm, and the height of the reinforcing rib plate 1 is preferably 50mm-300mm. The number of the reinforcing rib plates 1 can be 3-30, preferably 6-10. The reinforcing rib plates 1 can be provided with the central axis of the cone 2 as the center of symmetry.

[0025] In the flash evaporation device, the shape of the cone 2 can be a circular truncated cone. The ratio of the diameter of the upper surface of the cone 2, the diameter of the lower surface of the cone 2 and the height of the cone 2 can be 1:1:1:5, preferably 1:2. The diameter of the upper surface of the cone 2 can be 100mm-900mm, preferably 300mm-400mm. The diameter of the lower surface of the cone 2 can be 200mm-1000mm, preferably 300mm-500mm. The height of the cone 2 can be 100mm-500mm, preferably 200mm-400mm.

[0026] In the flash evaporation device, in order to ensure the rotational dispersion of the gas-liquid two-phase flow, the inclined baffles 3 and the vertical baffles 4 are preferably arranged at intervals. The included angle between adjacent inclined baffles 3 and vertical baffles 4 can be 6-60°, preferably 18-30°.

[0027] In the flash evaporation device, the number of inclined baffles 3 can be 3-30, preferably 6-10. The shape of the inclined baffles 3 is a right trapezoid or a sector. The length of the inclined baffles 3 can be 20mm-200mm, preferably 50mm-100mm. The width of the inclined baffles 3 can be 20mm-200mm, preferably 50mm-100mm. The included angle between the inclined baffles 3 and the flash evaporation tank can be 5-45°, preferably 10-30°. The inclined baffles 3 can be arranged with the central axis of the cone 2 as the center of symmetry.

[0028] In the flash evaporation device, the number of vertical baffles 4 can be 3-30, preferably 6-10. The shape of the vertical baffles 4 is a rectangle or a square. The length of the vertical baffles 4 can be 20mm-200mm, preferably 50mm-100mm. The vertical baffles 4 can be arranged with the central axis of the cone 2 as the center of symmetry.

[0029] In the flash evaporation device, the number of the reinforcing rib plates 1, the inclined baffles 3 and the vertical baffles 4 is equal and arranged at intervals. The ratio of the included angle between adjacent reinforcing rib plates 1 and inclined baffles 3 to the included angle between adjacent reinforcing rib plates 1 and vertical baffles 4 can be 1:(0.1-10), preferably 1:(0.5-2). The included angle between adjacent reinforcing rib plates 1 and inclined baffles 3 can be 6-60°, preferably 18-30°. The included angle between adjacent reinforcing rib plates 1 and vertical baffles 4 can be 6-60°, preferably 18-30°.

[0030] In the flash equipment, the shape of the connecting pipe 5 can be a circular tube. The outer diameter of the connecting pipe 5 can be DN100-DN900, preferably DN300-DN400. The inner diameter of the connecting pipe 5 can be DN80-DN90. The outer diameter of the connecting pipe 5, the diameter of the upper surface of the cone 2 and the caliber of the feed port are the same. The ratio of the height of the connecting pipe 5 to the height of the cone 2 can be 1:(0.9-1.5), preferably 1:(1-1.2).

[0031] In the flash equipment, in order to reduce the impact and wear of the material on the pipeline and the flash tank, the outer side of the connecting pipe 5 is preferably provided with a reinforcing ring 8.

[0032] In the flash equipment, the support pipe 6 can be a circular tube. The height of the support pipe 6 is the same as the height of the cone 2.

[0033] In the flash equipment, the connecting flange 7 is a conventional flange in the art.

[0034] In some embodiments, the feed port comprises a cone 2, which is a circular truncated cone, and a stirring device with spiral blades arranged inside the cone; a reinforcing rib plate 1 is arranged on the outer side of the cone 2, the reinforcing rib plate 1 is trapezoidal in shape, and the number of reinforcing rib plates 1 is 3-30; a support pipe 6 is arranged on the central axis of the cone 2, the support pipe 6 is a circular tube; an inclined baffle 3 and a vertical baffle 4 are arranged between the cone 2 and the support pipe 6, the number of inclined baffles 3 is 3-30, the shape of the inclined baffles 3 is a right trapezoid or a sector, and the angle between the inclined baffles 3 and the flash tank is 5-45°; the number of vertical baffles 4 is 3-30; the number of reinforcing rib plates 1, inclined baffles 3 and vertical baffles 4 is equal and arranged at intervals, and arranged with the central axis of the cone 2 as the center of symmetry; the angle between adjacent reinforcing rib plates 1 and inclined baffles 3 is 6-60°, the angle between adjacent reinforcing rib plates 1 and vertical baffles 4 is 6-60°, and the angle between adjacent inclined baffles 3 and vertical baffles 4 is 6-60°; a connecting flange 7 is connected to the top of the cone 2 through a connecting pipe 5, and the shape of the connecting pipe 5 is a circular tube.

[0035] The present invention also provides a method for decarbonizing a carbonate solution, comprising: adding a carbonate solution that has absorbed carbon dioxide to the aforementioned flash evaporation apparatus for decarbonization. According to the method, the carbonate solution enters the flash evaporation tank through a feed port equipped with vertical guide plates and inclined guide plates of a specially shaped and angled design, dispersing some of the pressure. This addresses the problem of severe erosion between the gas and liquid phases caused by excessively high local pressure within the flash evaporation tank, reduces continuous impact on the equipment, eliminates vibration, and extends the equipment's service life.

[0036] In the method of the present invention, the conditions of the decarburization treatment include: a temperature of 200° C. to 900° C.; and a pressure of 0.75 MPa±0.05 MPa. In this document, the pressure is gauge pressure.

[0037] In the method of the present invention, in order to reduce wear on the flash tank, the method preferably further comprises: subjecting the carbonate solution to a decompression treatment before adding the carbonate solution to the flash device.

[0038] In the method of the present invention, the flow rate of the carbonate solution in the flash evaporation equipment can be 1000-2000m 3 / h, specifically for example, 1000m 3 / h、1200m 3 / h、1400m 3 / h、1600m 3 / h、1800m 3 / h or 2000m 3 / h. The carbonate solution may be an aqueous solution of potassium carbonate and / or an aqueous solution of sodium carbonate. The concentration of the carbonate solution may be between 20 mg / L and 200 mg / L. The decarbonization process utilizes the carbonate solution to react with carbon dioxide to form bicarbonate, thereby capturing and removing carbon dioxide.

[0039] The flash evaporation device and the carbonate solution decarbonization method of the present invention are further illustrated by examples. The examples are implemented based on the technical solution of the present invention and provide detailed implementation methods and specific operating processes, but the scope of protection of the present invention is not limited to the following examples.

[0040] The experimental methods in the following examples, unless otherwise specified, are all conventional methods in the art. The experimental materials used in the following examples, unless otherwise specified, are all commercially available.

[0041] Example 1

[0042] The flash equipment includes a flash tank with a width of 1000 mm and a feed inlet with a caliber of DN100 arranged at the top of the flash tank, the feed inlet includes a cone 2 and a stirring device with helical blades arranged inside the cone, the cone 2 is a circular truncated cone, a reinforcing rib plate 1 is arranged outside the cone 2, the reinforcing rib plate 1 is trapezoidal in shape, the number of the reinforcing rib plate 1 is three, a support pipe 6 is arranged at the central axis of the cone 2, the support pipe 6 is a circular pipe, an inclined guide plate 3 and a vertical guide plate 4 are arranged between the cone 2 and the support pipe 6, the number of the inclined guide plate 3 is three, the inclined guide plate 3 is right trapezoidal in shape, and the angle between the inclined guide plate 3 and the flash tank is 5°; the number of the vertical guide plate 4 is three, the vertical guide plate 4 is rectangular in shape, the number of the reinforcing rib plate 1, the inclined guide plate 3 and the vertical guide plate 4 is equal and arranged at intervals, and arranged with the central axis of the cone 2 as the center of symmetry, the angle between adjacent reinforcing rib plates 1 and inclined guide plates 3 is 40°, the angle between adjacent reinforcing rib plates 1 and vertical guide plates 4 is 60°, and the angle between adjacent inclined guide plates 3 and vertical guide plates 4 is 20°; a flange 7 is connected to the top of the cone 2 through a connecting pipe 5, the connecting pipe 5 is circular in shape, and a reinforcing ring 8 is preferably arranged outside the connecting pipe 5.

[0043] A sodium carbonate aqueous solution with a concentration of 100 mg / L is reduced in pressure to 0.75 MPa by a pressure reducing pump, and then introduced into the flash equipment in Example 3 at a flow rate of 1500 m3 / h for decarburization treatment, the volume of carbon dioxide dissolved in the sodium carbonate aqueous solution is twice that of the sodium carbonate aqueous solution, the temperature of the decarburization treatment is 145℃, and the pressure is 0.75 MPa. The stirring rate of the stirring device is 1000 rpm. During the decarburization treatment, the flash equipment eliminates vibration and has no any wear.

[0044] Example 3

[0045] The flash equipment includes a flash tank with a width of 5000mm and a feed inlet with a caliber of DN400 arranged at the top of the flash tank, the feed inlet includes a cone 2 and a stirring device with helical blades arranged inside the cone, the cone 2 is a circular truncated cone, a reinforcing rib plate 1 is arranged outside the cone 2, the reinforcing rib plate 1 is trapezoidal in shape, the number of the reinforcing rib plate 1 is three, a support pipe 6 is arranged at the central axis of the cone 2, the support pipe 6 is a circular pipe, an inclined flow guide plate 3 and a vertical flow guide plate 4 are arranged between the cone 2 and the support pipe 6, the number of the inclined flow guide plate 3 is three, the inclined flow guide plate 3 is right trapezoidal in shape, and the angle between the inclined flow guide plate 3 and the flash tank is 5°; the number of the vertical flow guide plate 4 is three, the vertical flow guide plate 4 is rectangular in shape, the number of the reinforcing rib plate 1, the inclined flow guide plate 3 and the vertical flow guide plate 4 is equal and arranged at intervals, and arranged with the central axis of the cone 2 as the center of symmetry, the angle between adjacent reinforcing rib plates 1 and inclined flow guide plates 3 is 45°, the angle between adjacent reinforcing rib plates 1 and vertical flow guide plates 4 is 60°, and the angle between adjacent inclined flow guide plates 3 and vertical flow guide plates 4 is 20°; a flange 7 is connected to the top of the cone 2 through a connecting pipe 5, the connecting pipe 5 is circular in shape, and a reinforcing ring 8 is preferably arranged outside the connecting pipe 5.

[0046] A sodium carbonate aqueous solution with a concentration of 100mg / L is reduced in pressure to a pressure of 0.75MPa by a pressure reducing pump, and then introduced into the flash equipment in Example 3 at a flow rate of 1500m 3 / h to carry out decarburization treatment, the volume of carbon dioxide dissolved in the sodium carbonate aqueous solution is twice that of the sodium carbonate aqueous solution, the temperature of the decarburization treatment is 148℃, and the pressure is 0.80MPa. The stirring rate of the stirring device is 1000r / min. During the decarburization treatment, the flash equipment eliminates vibration and has no any wear.

[0047] Example 3

[0048] The flash equipment includes a flash tank with a width of 7000 mm and a feed inlet with a caliber of DN300 arranged at the top of the flash tank, the feed inlet includes a cone 2 and a stirring device with helical blades arranged inside the cone, the cone 2 is a circular truncated cone, a reinforcing rib plate 1 is arranged outside the cone 2, the reinforcing rib plate 1 is in the shape of a trapezoid, the number of the reinforcing rib plate 1 is three, a support pipe 6 is arranged at the central axis of the cone 2, the support pipe 6 is a circular pipe, an inclined flow guide plate 3 and a vertical flow guide plate 4 are arranged between the cone 2 and the support pipe 6, the number of the inclined flow guide plate 3 is three, the inclined flow guide plate 3 is in the shape of a right trapezoid, the angle between the inclined flow guide plate 3 and the flash tank is 5°; the number of the vertical flow guide plate 4 is three, the vertical flow guide plate 4 is in the shape of a rectangle, the number of the reinforcing rib plate 1, the inclined flow guide plate 3 and the vertical flow guide plate 4 is equal and arranged at intervals, and arranged with the central axis of the cone 2 as the center of symmetry, the angle between the adjacent reinforcing rib plate 1 and the inclined flow guide plate 3 is 50°, the angle between the adjacent reinforcing rib plate 1 and the vertical flow guide plate 4 is 60°, and the angle between the adjacent inclined flow guide plate 3 and the vertical flow guide plate 4 is 20°; a flange 7 is connected to the top of the cone 2 through a connecting pipe 5, the connecting pipe 5 is in the shape of a circular pipe, and a reinforcing ring 8 is preferably arranged outside the connecting pipe 5.

[0049] A sodium carbonate aqueous solution with a concentration of 100 mg / L is decompressed to a pressure of 0.75 MPa by a decompression pump, and then fed into the flash equipment in Example 3 at a flow rate of 1500 m 3 / h to carry out decarbonization treatment, the volume of carbon dioxide dissolved in the sodium carbonate aqueous solution is 2 times that of the sodium carbonate aqueous solution, the temperature of the decarbonization treatment is 146℃, and the pressure is 0.70 MPa. The stirring rate of the stirring device is 1000 rpm. During the decarbonization treatment, the flash equipment eliminates vibration and has no any wear.

[0050] Comparative Example 1

[0051] A potassium carbonate aqueous solution with a concentration of 100 mg / L is decompressed to a pressure of 0.70 MPa by a decompression pump, and then fed into a conventional flash equipment in the art at a flow rate of 1000 m 3 / h to carry out decarbonization treatment, the volume of carbon dioxide dissolved in the potassium carbonate aqueous solution is 3.15 times that of the potassium carbonate aqueous solution, the temperature of the decarbonization treatment is 145℃, and the pressure is 0.12 MPa. The pressure of the feed inlet is 0.10 MPa, and the pressure of the gas and solution outlets after flashing is 0.03 MPa. During the decarbonization treatment, due to decompression, the flow rate of the gas-liquid two-phase increases several times, which generates a huge impact force on the flash tank, the flash equipment vibrates seriously, is repeatedly punched in a large area, and needs to be repaired and reinforced.

[0052] As can be seen from the comparison between the examples and the comparative examples, the example of the flash evaporation apparatus according to the present application improves the vibration phenomenon and the flash evaporation apparatus is not damaged at all.

[0053] The above describes the preferred embodiments of the present application in detail, but the present application is not limited thereto. Within the technical concept of the present application, various simple modifications can be made to the technical solutions of the present application, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be considered as the disclosed content of the present application and belong to the protection scope of the present application.

Claims

1. A flash evaporation device comprising a flash evaporation tank and a feed port arranged at the top of the flash evaporation tank, characterized in that: The feed port comprises a cone (2) and a stirring device with spiral blades arranged inside the cone, a reinforcing rib plate (1) is arranged on the outside of the cone (2), a support pipe (6) is arranged on the central axis of the cone (2), an inclined guide plate (3) and a vertical guide plate (4) are arranged between the cone (2) and the support pipe (6), and a flange (7) is connected to the top of the cone (2) through a connecting pipe (5).

2. The flash evaporation equipment according to claim 1, characterized in that A reinforcement ring (8) is provided on the outer side of the connecting pipe (5).

3. The flash evaporation equipment according to claim 1 or 2, characterized in that The inclined guide plate (3) and the vertical guide plate (4) are arranged at intervals.

4. The flash evaporation equipment according to claim 1, characterized in that The number of the inclined guide plates (3) is 3-30.

5. The flash evaporation equipment according to claim 4, characterized in that The angle between the inclined guide plate (3) and the flash tank is 5-45°.

6. The flash evaporation equipment according to claim 1, characterized in that The number of the vertical guide plates (4) is 3-30.

7. The flash evaporation equipment according to claim 1, characterized in that The number of the reinforcing rib plates (1) is 3-30.

8. The flash evaporation equipment according to any one of claims 4 to 7, characterized in that: The number of the reinforcing rib plates (1), the inclined guide plates (3) and the vertical guide plates (4) is equal and they are arranged at intervals.

9. The flash evaporation equipment according to any one of claims 4 to 7, characterized in that: The shape of the inclined guide plate (3) is a right-angled trapezoid or a fan-shaped; and / or The vertical guide plate (4) is in the shape of a rectangle or a square.

10. A method for decarbonizing a carbonate solution, characterized in that: The method comprises: adding a carbonate solution that has absorbed carbon dioxide into the flash evaporation equipment according to any one of claims 1 to 9 for decarbonization treatment.

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