Venturi tube for carbon capture

Abstract

According to the technical scheme, the venturi tube comprises a venturi tube body and a dehumidifier, the venturi tube body is formed by sequentially splicing an inlet section, a gradually-shrinking section, a throat part and a gradually-expanding section, three introduction tubes are all connected with the throat part, and the three introduction tubes are arranged at 60-degree intervals in the circumferential direction; the three first pipe rows and the two second pipe rows of the dehumidifier are arranged on the diverging section and are alternately arranged at equal intervals in the axial direction of the diverging section. The Venturi tube has the advantages that boiler flue gas and carbon capture absorption liquid are mixed through the Venturi tube body, meanwhile, the dehumidifier is installed on the divergent section, on one hand, liquid drops in the flue gas can be condensed and flow to the drainage groove along the bottom of the divergent section through the dehumidifier, on the other hand, waste heat in the flue gas can be absorbed, and the carbon capture absorption liquid can be recycled. Waste heat of smoke heats absorption liquid in the first pipe row and the second pipe row, follow-up absorption reaction is facilitated, the structure is simple, the manufacturing cost is low, operation and maintenance are convenient, and the high application prospect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to carbon capture technical field especially relates to a venturi for carbon capture. BACKGROUND

[0002] At present, the most widely used flue gas carbon dioxide capture method is chemical absorption method. In the absorption tower, flue gas enters the absorption tower from the bottom and flows upward, and the absorption liquid is atomized by the spray head and then sprayed downward, forming countercurrent with the flue gas. In the process of gas-liquid mixed flow, carbon dioxide is absorbed by the absorption liquid, realizing the effect of carbon capture.

[0003] In order to ensure that carbon dioxide is fully absorbed, the absorption tower is generally provided with multiple layers of spray, and the humidity of flue gas will greatly increase after passing through the absorption tower, often requiring additional setting of dehumidification equipment, plus the large land occupation of the absorption tower, resulting in high initial investment cost, land cost and operation and maintenance cost of the traditional flue gas carbon capture method.

[0004] On the other hand, the venturi has been applied in many industrial fields due to its simple structure, low cost and excellent performance. According to Bernoulli's principle, the gas will produce a high flow rate when flowing through the throat position of the venturi, and introducing liquid at the throat position can make the gas and liquid mix at the throat and the gradually expanding section.

[0005] Chinese patent No. ZL201420681812.2, patent name is a kind of venturi, the venturi includes sequentially connected conical section, cylindrical section, inverted conical throat pipe section and outlet diffusion section;The top of conical section is provided with first inlet, the side of cylindrical section is provided with second inlet, the area of first inlet is smaller than the area of second inlet;Outlet diffusion section is composed of sequentially connected vertical section, curved transition section and horizontal section, vertical section is in the shape of a cone, horizontal section is in the shape of a cylinder. The problem is that it cannot play the role of flue gas dehumidification.

[0006] Chinese patent No. ZL202321390558.6, patent name is a kind of venturi, including main pipeline, the main pipeline inside is equipped with main channel for conveying reaction liquid, the main pipeline inside is equipped with two partitions, two partitions divide the main pipeline into main channel and two shunt channels, the top of both sides of main pipeline is fixedly provided with circulating part. The utility model discloses circulating part is arranged above the liquid level of reaction liquid, high pressure air enters circulating part through shunt channel, branch pipe is in the structure of venturi, so that high pressure air generates suction force at absorption hole, and reaction liquid in falling process is sucked into branch pipe and sprayed again, so that it is contacted with flue gas for the second time, so that the falling process of reaction liquid is delayed, the contact time of reaction liquid and flue gas is increased, and the effect of reaction liquid is more fully played. The problem is that it cannot play the role of flue gas dehumidification.

[0007] In summary, in order to improve the shortcomings of the traditional carbon capture absorption tower, while taking advantage of the Venturi tube, it can also play a role in flue gas dehumidification, so a new type of carbon capture absorption device needs to be designed. Content of the utility model

[0008] The utility model discloses to the above-mentioned defects of prior art, provide a kind of for carbon capture Venturi tube, the utility model discloses simple structure, low cost, in throat position, flue gas and absorption liquid are mixed and absorbed carbon dioxide;In the position of gradually expanding section, pipe row one can recover the waste heat in flue gas, reduce exhaust heat loss, on the other hand, it plays the role of flue gas dehumidification, with higher practicality.

[0009] The utility model discloses a kind of for carbon capture Venturi tube, its technical scheme is: including Venturi tube body (1) and dehumidifier (2);The Venturi tube body (1) includes inlet section (101), taper section (102), throat (103), gradually expanding section (104), introduction pipe (105), drain groove (106) and drain pipe (107), wherein Venturi tube body (1) is sequentially spliced by inlet section (101), taper section (102), throat (103) and gradually expanding section (104), three introduction pipes (105) are connected with throat (103), three introduction pipes (105) are arranged at 60 ° interval in ring direction;The dehumidifier (2) includes first pipe row (201), second pipe row (202), first distributor (203), second distributor (204), first liquid collector (205), second liquid collector (206), first inflow pipe (207), second inflow pipe (208), first outflow pipe (209) and second outflow pipe (210), wherein three first pipe rows (201) and two second pipe rows (202) are evenly arranged in gradually expanding section (104), and are alternately arranged at equal intervals along the axial direction of gradually expanding section (104).

[0010] Preferably, the diameter ratio of the above-mentioned inlet section (101) to the throat (103) is 5:1, and the length of the gradually expanding section (104) is greater than 30 times the diameter of the throat (103).

[0011] Preferably, the three first pipe rows (201) and the two second pipe rows (202) are alternately arranged at equal intervals along the axial direction of the gradually expanding section (104), and the interval is one twelfth of the length of the gradually expanding section (104).

[0012] Preferably, the bottom of the gradually expanding section (104) is provided with a drain groove (106), and the bottom of the drain groove (106) is connected with the drain pipe (107).

[0013] Preferably, the lower ends of the three first tube rows (201) of the dehumidifier (2) are not in contact with the bottom of the gradually expanding section (104), and the upper ends of the two second tube rows (202) are not in contact with the upper part of the gradually expanding section (104).

[0014] Preferably, the heights of the three first tube rows (201) and the two second tube rows (202) of the dehumidifier (2) are different, and the height is two-thirds of the diameter of the tube at the position, and the lengths are equal, and the length is one-sixth of the length of the gradually expanding section (104).

[0015] Preferably, the three first tube rows (201) and the two second tube rows (202) of the dehumidifier (2) all run through the gradually expanding section (104) in the horizontal direction; the first distributor (203) and the first liquid collector (205) are both installed at the two ends of the first tube row (201), wherein the first distributor (203) is installed at one end close to the first inflow pipe (207), and the first liquid collector (205) is installed at one end close to the first outflow pipe (209); the second distributor (204) and the second liquid collector (206) are both installed at the two ends of the second tube row (202), wherein the second distributor (204) is installed at one end close to the second inflow pipe (208), and the second liquid collector (206) is installed at one end close to the second outflow pipe (210).

[0016] Preferably, each first tube row (201) of the dehumidifier (2) is connected with one first distributor (203) and one first liquid collector (205), and there are three first distributors (203) and three first liquid collectors (205) in total; each second tube row (202) is connected with one second distributor (204) and one second liquid collector (206), and there are two second distributors (204) and two second liquid collectors (206) in total.

[0017] Preferably, the upper ends of the three first distributors (203) of the dehumidifier (2) are connected to the same first inflow pipe (207), and the upper ends of the two second distributors (204) are connected to the same second inflow pipe (208).

[0018] Preferably, the lower ends of the three first liquid collectors (205) are connected to the same first outflow pipe (209), and the lower ends of the two second liquid collectors (206) are connected to the same second outflow pipe (210).

[0019] The beneficial effects of the dehumidifier are as follows:

[0020] The utility model discloses a venturi body mixes the boiler flue gas and carbon capture absorption liquid, and the dehumidifier is equipped with in the gradually expanded section, and the dehumidifier can make the liquid drop in the flue gas condense and flow to the drain groove along the gradually expanded section bottom on one hand, and can also absorb the waste heat in the flue gas on the other hand, and the waste heat of flue gas heats the absorption liquid in the first pipe row and the second pipe row, is favorable to the subsequent absorption reaction, compared with the traditional absorption tower equipment, the utility model discloses carbon capture and flue gas dehumidification in an organic whole, and the simple structure is low in cost, and convenient to operate and maintain, and has higher application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the appearance schematic drawing of the utility model;

[0022] Figure 2 It is the perspective structure schematic drawing of the utility model;

[0023] Figure 3 It is the structure schematic drawing of the utility model in the overhead direction;

[0024] Figure 4 It is the A-A section view of the utility model;

[0025] Figure 5 It is the appearance schematic drawing of the second pipe row of the utility model;

[0026] Figure 6 It is the appearance schematic drawing of the first pipe row of the utility model;

[0027] In the drawing, 1-venturi body, 101-inlet section, 102-tapered section, 103-throat, 104-expanded section, 105-introduction pipe, 106-drain groove, 107-drain pipe, 2-dehumidifier, 201-first pipe row, 202-second pipe row, 203-first liquid separator, 204-second liquid separator, 205-first liquid collector, 206-second liquid collector, 207-first inflow pipe, 208-second inflow pipe, 209-first outflow pipe, 210-second outflow pipe. DETAILED DESCRIPTION

[0028] The preferred embodiments of the utility model are described below in combination with the drawings, and it should be understood that the preferred embodiments described here are only for illustrating and explaining the utility model, and are not for limiting the utility model.

[0029] Example 1, refer to Figures 1-6The utility model provides a kind of venturi for carbon capture, including venturi body 1 and dehumidifier 2;The venturi body 1 includes inlet section 101, taper section 102, throat 103, gradually expanding section 104, introduction pipe 105, drain groove 106 and drain pipe 107;The dehumidifier 2 includes first tube row 201, second tube row 202, first distributor 203, second distributor 204, first liquid collector 205, second liquid collector 206, first inflow pipe 207, second inflow pipe 208, first outflow pipe 209 and second outflow pipe 210.

[0030] Venturi body 1 is sequentially spliced by inlet section 101, taper section 102, throat 103 and gradually expanding section 104, and the bottom of gradually expanding section 104 is provided with drain groove 106, and the bottom of drain groove 106 is connected with drain pipe 107.The length L of gradually expanding section 104 is the axial distance from the end of throat 103 to the tail of gradually expanding section 104, the diameter ratio of inlet section 101 to throat 103 is 5:1, the length L of gradually expanding section 104 is greater than 30 times the diameter of throat 103, three introduction pipes 105 are connected with throat 103, and the three introduction pipes 105 are arranged at an interval of 60° in a ring direction.Boiler flue gas enters venturi body 1 from inlet section 101, and absorbing liquid is mixed with boiler flue gas at the position of throat 103 along three introduction pipes 105, and with the mutual disturbance of absorbing liquid and flue gas, liquid phase is broken to form small droplets, and carbon dioxide in flue gas is absorbed by absorbing liquid.Absorbing liquid flows to drain groove 106 along the bottom of gradually expanding section 104 and finally flows out from drain pipe 107, and flue gas flows along gradually expanding section 104 and flows out of venturi body 1 after flowing through three first tube rows 201 and two second tube rows 202.

[0031] Three first tube rows 201 of dehumidifier 2 are arranged on the lower side inside gradually expanding section 104, and the lower end of three first tube rows 201 is not in contact with the bottom of gradually expanding section 104, so as to ensure that absorbing liquid can flow to drain groove 106 along the bottom of gradually expanding section 104.Two second tube rows 202 are arranged on the upper side inside gradually expanding section 104, and the upper end of two second tube rows 202 is not in contact with the upper part of gradually expanding section 104.

[0032] Three first tube rows 201 and two second tube rows 202 are arranged at equal intervals along the axial direction of gradually expanding section 104, and the flow direction of flue gas in gradually expanding section 104 is changed constantly by the alternate arrangement. Figure 3 As shown in the figure, three first tube rows 201 and two second tube rows 202 are arranged at equal intervals along the axial direction of gradually expanding section 104, and the interval is one twelfth, and the first tube row 201 closest to throat 103 is located at five thirds of gradually expanding section 104 from the end of throat 103.

[0033] The heights of the three first tube rows 201 and the two second tube rows 202 are different, and the lengths are equal. The height is two-thirds of the diameter of the tube at the position, and the length is one-sixth.

[0034] When the flue gas flows through the first tube rows 201 and the second tube rows 202, the flow direction changes constantly. After passing through each first tube row 201 (or second tube row 202), the velocity of the flue gas increases due to the decrease of the flow cross-sectional area, and then decreases after the change of direction due to the expansion of the flow cross-sectional area. The flue gas continues to flow through the next second tube row 202 (or first tube row 201). Due to the constant change of the flow direction of the flue gas and the difference in inertia between the flue gas and the liquid droplets, the liquid droplets carried by the flue gas will collide with the wall of the first tube row 201 and the second tube row 202. After the liquid droplets gather, they will flow downward along the wall under the action of gravity, finally flow along the bottom of the gradually expanding section 104 to the drain groove 106, and play the role of gas-liquid inertial separation.

[0035] The first inflow pipe 207 of the dehumidifier 2 is connected to the upper end of the three first distributors 203, and the second inflow pipe 208 is connected to the upper end of the two second distributors 204. The first outflow pipe 209 is connected to the lower end of the three first collectors 205, and the second outflow pipe 210 is connected to the lower end of the two second collectors 206. Through the upward and downward flow of the absorption liquid, it is ensured that the absorption liquid fully fills the first tube rows 201 and the second tube rows 202.

[0036] The three first tube rows 201 and the two second tube rows 202 of the dehumidifier 2 all pass through the gradually expanding section 104 in the horizontal direction. The first distributor 203 and the first collector 205 are both installed at the two ends of the first tube row 201, wherein the first distributor 203 is installed at the end close to the first inflow pipe 207, and the first collector 205 is installed at the end close to the first outflow pipe 209. The second distributor 204 and the second collector 206 are both installed at the two ends of the second tube row 202, wherein the second distributor 204 is installed at the end close to the second inflow pipe 208, and the second collector 206 is installed at the end close to the second outflow pipe 210.

[0037] Each first tube row 201 of the dehumidifier 2 is connected to a first distributor 203 and a first collector 205, and there are three first distributors 203 and three first collectors 205 in total. Each second tube row 202 is connected to a second distributor 204 and a second collector 206, and there are two second distributors 204 and two second collectors 206 in total.

[0038] The present application uses, in the case of small flue gas flow, small absorption liquid flow for carbon capture. At this time, the absorption liquid only enters the second tube row 202 along the second inflow pipe 208 and exchanges heat with the flue gas. The absorption liquid flows along the direction of the second inflow pipe 208→the second distributor 204→the second tube row 202→the second liquid collector 206→the second outflow pipe 210, and in this process, the absorption liquid absorbs heat through indirect heat exchange with the flue gas. After absorbing heat, the absorption liquid enters the throat 103 along the introduction pipe 105 and mixes with the flue gas. As the flue gas flows through the staggered first tube row 201 and the second tube row 202, the liquid droplets carried in the flue gas are separated and gathered at the bottom of the diverging section 104. Under the action of gravity, the absorption liquid flows along the bottom of the diverging section 104 to the drain groove 106 and is finally discharged from the drain pipe 107. Example 2:

[0039] In the case of increased flue gas flow, the absorption liquid flow required for carbon capture increases, and since the second tube row 202 has only two pieces, the upper limit of the absorption liquid flow is limited. In order to increase the absorption liquid flow, the absorption liquid can only enter the first tube row 201 along the first inflow pipe 207 and exchange heat with the flue gas. Since the first tube row 201 has three pieces connected in parallel, the absorption liquid flow can be increased. The absorption liquid flows along the direction of the first inflow pipe 207→the first distributor 203→the first tube row 201→the first liquid collector 205→the first outflow pipe 209, and in this process, the absorption liquid absorbs heat through indirect heat exchange with the flue gas. After absorbing heat, the absorption liquid enters the throat 103 along the introduction pipe 105 and mixes with the flue gas. As the flue gas flows through the staggered first tube row 201 and the second tube row 202, the liquid droplets carried in the flue gas are separated and gathered at the bottom of the diverging section 104. Under the action of gravity, the absorption liquid flows along the bottom of the diverging section 104 to the drain groove 106 and is finally discharged from the drain pipe 107. Example 3:

[0040] In the case of large flue gas flow, the absorption liquid flow required for carbon capture is large, and only one way of absorption liquid cannot meet the flow demand. At this time, two ways of absorption liquid need to be supplied at the same time. The absorption liquid is divided into two streams, one of which flows along the direction of first inflow pipe 207→first distributor 203→first tube row 201→first liquid collector 205→first outflow pipe 209, and the other of which flows along the direction of second inflow pipe 208→second distributor 204→second tube row 202→second liquid collector 206→second outflow pipe 210. In this process, the absorption liquid absorbs heat by indirect heat exchange with the flue gas. After absorbing heat, the two streams of absorption liquid enter the throat 103 through the introduction pipe 105 and mix with the flue gas. As the flue gas flows through the first tube row 201 and the second tube row 202 arranged in a staggered manner, the liquid droplets carried in the flue gas are separated and gathered at the bottom of the converging section 104. Under the action of gravity, the absorption liquid flows along the bottom of the converging section 104 to the drain groove 106, and finally is discharged from the drain pipe 107.

[0041] Embodiment 4: The Venturi tube for carbon capture provided by the utility model, including Venturi tube body 1 and dehumidifier 2, Venturi tube body 1 includes inlet section 101, converging section 102, throat 103, diverging section 104, introduction pipe 105, drain groove 106 and drain pipe 107, dehumidifier 2 includes first tube row 201, second tube row 202, first distributor 203, second distributor 204, first liquid collector 205, second liquid collector 206, first inflow pipe 207, second inflow pipe 208, first outflow pipe 209 and second outflow pipe 210.

[0042] The difference from embodiment 1 is that:

[0043] Four pieces of first tube row 201 and three pieces of second tube row 202 can be arranged along the axis of diverging section 104 in an alternating and equidistant manner, which can also achieve the purpose of the utility model.

[0044] Embodiment 4: The Venturi tube for carbon capture provided by the utility model, including Venturi tube body 1 and dehumidifier 2, Venturi tube body 1 includes inlet section 101, converging section 102, throat 103, diverging section 104, introduction pipe 105, drain groove 106 and drain pipe 107, dehumidifier 2 includes first tube row 201, second tube row 202, first distributor 203, second distributor 204, first liquid collector 205, second liquid collector 206, first inflow pipe 207, second inflow pipe 208, first outflow pipe 209 and second outflow pipe 210.

[0045] The difference from embodiment 1 is that:

[0046] Five first tube rows 201 and two second tube rows 202 can be arranged along the axis of the gradually expanding section 104 in an alternating and equal interval manner, and the purpose of the present application can be achieved.

[0047] In summary, the Venturi tube for carbon capture mixes flue gas and absorption liquid by using Bernoulli's principle, installs the first tube row 201 and the second tube row 202 in the gradually expanding section 104, separates flue gas and liquid drops by using the principle of the baffle type gas-water separator, and reduces the humidity of the flue gas to a certain extent; the absorption liquid is passed into the first tube row 201 and the second tube row 202, the waste heat of the flue gas is recovered through indirect heat exchange, and the absorption of carbon dioxide by the absorption liquid is promoted. The present application integrates carbon capture and flue gas dehumidification, has a simple structure, low cost, convenient operation and maintenance, and high application prospect.

[0048] Embodiment 5: The Venturi tube for carbon capture comprises a Venturi tube body 1 and a dehumidifier 2; the Venturi tube body 1 comprises an inlet section 101, a converging section 102, a throat 103, a gradually expanding section 104, an introduction pipe 105, a drainage groove 106 and a drainage pipe 107; the dehumidifier 2 comprises a first tube row 201, a second tube row 202, a first liquid separator 203, a second liquid separator 204, a first liquid collector 205, a second liquid collector 206, a first inflow pipe 207, a second inflow pipe 208, a first outflow pipe 209 and a second outflow pipe 210.

[0049] The difference between the embodiment 4 and the embodiment 5 is that:

[0050] Six first tube rows 201 and two second tube rows 202 can be arranged along the axis of the gradually expanding section 104 in an alternating and equal interval manner, and the purpose of the present application can be achieved.

[0051] The above is only a preferred embodiment of the present application, and any skilled person in the art can modify the present application by using the technical solutions described above or modify the present application into an equivalent technical solution. Therefore, any simple modification or equivalent transformation according to the technical solutions of the present application is within the scope of protection of the present application.

Claims

1. A venturi for carbon capture, characterised by: The application relates to a dehumidifier with a Venturi tube body (1) and a dehumidifier (2), wherein the Venturi tube body (1) comprises an inlet section (101), a converging section (102), a throat (103), a diverging section (104), three introduction pipes (105), a drainage groove (106) and a drainage pipe (107), the Venturi tube body (1) is sequentially spliced by the inlet section (101), the converging section (102), the throat (103) and the diverging section (104), the three introduction pipes (105) are connected with the throat (103), and the three introduction pipes (105) are arranged at an interval of 60 degrees in a ring direction; the dehumidifier (2) comprises a first pipe row (201), a second pipe row (202), a first distributor (203), a second distributor (204), a first collector (205), a second collector (206), a first inflow pipe (207), a second inflow pipe (208), a first outflow pipe (209) and a second outflow pipe (210), wherein three first pipe rows (201) and two second pipe rows (202) are arranged in the diverging section (104) and are alternately arranged at equal intervals along the axial direction of the diverging section (104).

2. A venturi for carbon capture according to claim 1 characterised by: The diameter ratio of the inlet section (101) to the throat (103) is 5:1, and the length of the diverging section (104) is greater than 30 times the diameter of the throat (103).

3. A venturi for carbon capture according to claim 2 characterised by: The three first pipe rows (201) and the two second pipe rows (202) are alternately arranged at equal intervals along the axial direction of the diverging section (104), and the interval is one twelfth of the length of the diverging section (104).

4. A venturi for carbon capture according to claim 1 characterised by: The bottom of the diverging section (104) is provided with the drainage groove (106), and the bottom of the drainage groove (106) is connected with the drainage pipe (107).

5. The venturi for carbon capture of claim 1, wherein: The lower end of the three first pipe rows (201) of the dehumidifier (2) is not in contact with the bottom of the diverging section (104), and the upper end of the two second pipe rows (202) is not in contact with the upper part of the diverging section (104).

6. The venturi for carbon capture of claim 1, wherein: The heights of the three first pipe rows (201) and the two second pipe rows (202) of the dehumidifier (2) are different, the height is two thirds of the pipe diameter at the position, the length is equal, and the length is one sixth of the length of the diverging section (104).

7. The venturi for carbon capture of claim 1, wherein: The three first pipe rows (201) and the two second pipe rows (202) of the dehumidifier (2) penetrate the diverging section (104) in the horizontal direction; the first distributor (203) and the first collector (205) are installed at the two ends of the first pipe row (201), wherein the first distributor (203) is installed at one end close to the first inflow pipe (207), and the first collector (205) is installed at one end close to the first outflow pipe (209); the second distributor (204) and the second collector (206) are installed at the two ends of the second pipe row (202), wherein the second distributor (204) is installed at one end close to the second inflow pipe (208), and the second collector (206) is installed at one end close to the second outflow pipe (210).

8. The venturi for carbon capture of claim 1, wherein: Each of the first tube rows (201) of the dehumidifier (2) is connected with a first distributor (203) and a first collector (205), and there are three first distributors (203) and three first collectors (205) in total; each of the second tube rows (202) is connected with a second distributor (204) and a second collector (206), and there are two second distributors (204) and two second collectors (206) in total.

9. The venturi for carbon capture of claim 1, wherein: The upper ends of the three first distributors (203) of the dehumidifier (2) are connected with a same first inflow tube (207), and the upper ends of the two second distributors (204) are connected with a same second inflow tube (208).

10. The venturi for carbon capture of claim 9, wherein: The lower ends of the three first collectors (205) are connected with a same first outflow tube (209), and the lower ends of the two second collectors (206) are connected with a same second outflow tube (210).

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