Device for capturing carbon dioxide in flue gas

Abstract

The utility model relates to a trapping device for carbon dioxide in flue gas. A gas inlet pipe is arranged on one side of a spray tower, a gas outlet pipe is arranged at the top end of the spray tower, a spray mechanism is arranged in the spray tower, a connecting pipe is fixedly connected to the other side of the spray tower, and a solution pump is fixedly connected to the bottom end of the connecting pipe. Flue gas flows to the spraying plate, the spaces are cut by round holes in the spraying plate, the flue gas is dispersed, the flue gas flows through the small spaces one by one, an acetic acid / coal ash solution is sprayed out from the round holes in the spraying plate through a second spraying head, and when the flue gas passes through the round holes in the spraying plate, the acetic acid / coal ash solution is sprayed out. The contact reaction area of the acetic acid / fly ash solution and carbon dioxide in the flue gas is increased, so that the carbon dioxide in the flue gas fully reacts with the acetic acid / fly ash solution, the gas-liquid contact reaction efficiency can be improved, and the capture efficiency of the carbon dioxide in the flue gas is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of carbon dioxide capture, in particular to a device for capturing carbon dioxide in flue gas. Background Art

[0002] Carbon dioxide, a carbon oxide, is a colorless and tasteless or colorless and odorless gas at room temperature and pressure, and its aqueous solution has a slightly sour taste. It is also a common greenhouse gas and a component of air. In terms of physical properties, the melting point of carbon dioxide is -56.6°C, the boiling point is -78.5°C, the density is greater than the density of air (under standard conditions), and it is soluble in water. In terms of chemical properties, carbon dioxide is chemically inactive, has high thermal stability, cannot burn, and usually does not support combustion. It is an acidic oxide and has the general properties of acidic oxides. Because it reacts with water to produce carbonic acid, it is the anhydride of carbonic acid.

[0003] After searching, a Chinese patent with a publication number of CN 219682152 U discloses a device for capturing carbon dioxide in flue gas, including an integrally formed solution storage tank and a spray tower, wherein the spray tower is located above the solution storage tank, and the solution storage tank is connected to the upper side wall of the spray tower through a solution pump, an acetic acid solution and fly ash are arranged in the solution storage tank, a flue gas inlet is provided below the side wall of the spray tower, and a flue gas outlet is provided at the top of the spray tower. The patent sprays a solution obtained by fully mixing the acetic acid solution and the fly ash in a spray tower to complete a carbonation reaction between calcium and magnesium ions in the solution and carbon dioxide in the flue gas, thereby capturing carbon dioxide in the flue gas. However, due to the excessively fast flow rate of the flue gas and the large spraying range, the efficiency of the gas-liquid contact reaction is reduced, thereby reducing the capture efficiency of carbon dioxide in the flue gas. Utility Model Content

[0004] The utility model aims to provide a device for capturing carbon dioxide in flue gas. When the flue gas flows to a spray plate, the circular holes on the spray plate cut space to disperse the flue gas, allowing the flue gas to flow through small spaces. A second nozzle sprays an acetic acid / fly ash solution through the circular holes on the spray plate, so that when the flue gas passes through the circular holes on the spray plate, the contact reaction area between the acetic acid / fly ash solution and the carbon dioxide in the flue gas is increased, thereby allowing the carbon dioxide in the flue gas to fully react with the acetic acid / fly ash solution, thereby improving the gas-liquid contact efficiency, thereby improving the efficiency of carbon capture of carbon dioxide.

[0005] The utility model adopts the following technical scheme: a device for capturing carbon dioxide in flue gas, comprising: a spray tower, an air outlet pipe, and a spray mechanism, wherein an air inlet pipe is arranged on one side of the spray tower; the air outlet pipe is arranged at the top of the spray tower; the spray mechanism is arranged inside the spray tower, and a solution is sprayed by the spray mechanism to react with carbon dioxide in the flue gas;

[0006] The spraying mechanism includes a chemical tank and an atomizing component. Among them, the chemical tank mixes the solution that reacts with carbon dioxide in the flue gas, and the atomizing component atomizes and sprays the solution mixed by the chemical tank in the spray tower;

[0007] The chemical tank includes a solution storage tank, a liquid and ash replenishing pipe, a motor, a water suction pipe, a solution pump, a connecting pipe, a rotating rod, and a stirring rod. The connecting pipe is fixedly connected to the other side of the spray tower, the solution pump is fixedly connected to the bottom end of the connecting pipe, the water suction pipe is fixedly connected to one side of the solution pump, the solution storage tank is fixedly connected to one side of the water suction pipe, the liquid and ash replenishing pipe is fixedly connected to the top end of the solution storage tank, the motor is fixedly connected to the top of the solution storage tank, the rotating rod is fixedly connected to the bottom end of the motor, and the stirring rod is fixedly connected to the outer circumferential surface of the rotating rod;

[0008] The atomizing component includes a cavity, a support pipe, a spray plate, a first nozzle, a round hole, and a second nozzle. The cavity is opened inside the spray tower, the support pipe is fixedly connected inside the cavity, the spray plate is fixedly connected inside the cavity, the first nozzle is fixedly connected to the bottom end of the support pipe, the round hole is opened at the bottom end of the spray plate, and the second nozzle is fixedly connected inside the round hole.

[0009] Further, the rotating rod is rotatably connected to the solution storage tank, and the connecting pipe is fixedly connected to the support pipe and the second nozzle.

[0010] Further, the spray plate and the round hole as a whole are in the shape of honeycomb coal.

[0011] The utility model has the following beneficial effects:

[0012] When the flue gas flows to the spray plate, the round holes on the spray plate cut the space, dispersing the flue gas and allowing the flue gas to flow through small spaces one by one. The second nozzle sprays the acetic acid / fly ash solution in the round holes on the spray plate, increasing the contact reaction area between the acetic acid / fly ash solution and carbon dioxide in the flue gas when the flue gas passes through the round holes on the spray plate, so that carbon dioxide in the flue gas reacts fully with the acetic acid / fly ash solution. In this way, the gas-liquid contact efficiency can be improved, and the efficiency of carbon dioxide capture can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of the utility model;

[0014] Figure 2 is a schematic structural diagram of the rotating rod in the utility model;

[0015] Figure 3 is a schematic structural diagram of the spray plate in the utility model;

[0016] Figure 4 Structural schematic diagram of the first spray head in the present utility model;

[0017] Figure 5 Structural schematic diagram of the round hole in the present utility model.

[0018] In the figure: 1, spray tower; 2, intake pipe; 3, outlet pipe; 4, spraying mechanism; 401, solution storage tank; 402, liquid supplement and ash supplement pipe; 403, motor; 404, water suction pipe; 405, solution pump; 406, connecting pipe; 407, rotating rod; 408, stirring rod; 409, cavity; 410, support pipe; 411, spray plate; 412, first spray head; 413, round hole; 414, second spray head. Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] As Figures 1-5 shown, the flue gas carbon dioxide capture device provided in this embodiment mainly includes a spray tower 1, an intake pipe 2, an outlet pipe 3, and a spraying mechanism 4;

[0021] An intake pipe 2 is provided on one side of the spray tower 1; the outlet pipe 3 is provided at the top of the spray tower 1; the spraying mechanism 4 is provided inside the spray tower 1, and the solution is sprayed through the spraying mechanism 4 to react with the carbon dioxide in the flue gas.

[0022] The spraying mechanism 4 includes a chemical mixing tank and an atomizing component. Among them, the chemical mixing tank mixes the solution that reacts with the carbon dioxide in the flue gas, and the atomizing component atomizes and sprays the solution mixed by the chemical mixing tank in the spray tower 1.

[0023] The chemical mixing tank includes a solution storage tank 401, a liquid supplement and ash supplement pipe 402, a motor 403, a water suction pipe 404, a solution pump 405, a connecting pipe 406, a rotating rod 407, and a stirring rod 408. The connecting pipe 406 is fixedly connected to the other side of the spray tower 1, the solution pump 405 is fixedly connected to the bottom end of the connecting pipe 406, the water suction pipe 404 is fixedly connected to one side of the solution pump 405, the solution storage tank 401 is fixedly connected to one side of the water suction pipe 404, the liquid supplement and ash supplement pipe 402 is fixedly connected to the top end of the solution storage tank 401, the motor 403 is fixedly connected to the top of the solution storage tank 401, the rotating rod 407 is fixedly connected to the bottom end of the motor 403, and the stirring rod 408 is fixedly connected to the outer circumferential surface of the rotating rod 407.

[0024] The acetic acid solution and fly ash are transported into the solution storage tank 401 through the liquid replenishment and ash replenishment pipe 402. The motor 403 is started, and the motor 403 drives the rotating rod 407 to rotate. The rotating rod 407 drives the stirring rod 408 to rotate. The stirring rod 408 stirs the acetic acid solution and fly ash in the solution storage tank 401 to fully mix the acetic acid solution and fly ash. After the acetic acid solution and fly ash are fully mixed, the solution pump 405 is started. The solution pump 405 pumps out the acetic acid / fly ash solution in the solution storage tank 401 through the water suction pipe 404, and then transports the acetic acid / fly ash solution to the atomizing component in the spray tower 1 through the connecting pipe 406.

[0025] The atomizing component includes a cavity 409, a support pipe 410, a spray plate 411, a first spray head 412, a round hole 413, and a second spray head 414. The cavity 409 is opened inside the spray tower 1. The support pipe 410 is fixedly connected inside the cavity 409. The spray plate 411 is fixedly connected inside the cavity 409. The first spray head 412 is fixedly connected to the bottom end of the support pipe 410. The round hole 413 is opened at the bottom end of the spray plate 411. The second spray head 414 is fixedly connected inside the round hole 413.

[0026] The rotating rod 407 is rotatably connected to the solution storage tank 401. The connecting pipe 406 is fixedly connected to the support pipe 410 and the second spray head 414. The spray plate 411 and the round hole 413 are integrally of a honeycomb coal type.

[0027] The chemical material tank transports the acetic acid / fly ash solution to the support pipe 410 and the second spray head 414. The support pipe 410 sprays the acetic acid / fly ash solution in the cavity 409 of the spray tower 1 through the first spray head 412, allowing the flue gas to enter the cavity 409 of the spray tower 1 from the inlet pipe 2. The flue gas contacts and reacts with the acetic acid / fly ash solution sprayed by the first spray head 412 to complete the carbonation reaction between the carbon dioxide in the flue gas and the calcium and magnesium ions in the solution, forming calcium carbonate solids. The flue gas continues to flow upward and reaches the spray plate 411. The round holes 413 on the spray plate 411 cut the space to disperse the flue gas, allowing the flue gas to flow through small spaces one by one. The second spray head 414 sprays the acetic acid / fly ash solution in the round holes 413 on the spray plate 411, increasing the contact reaction area between the acetic acid / fly ash solution and the carbon dioxide in the flue gas when the flue gas passes through the round holes 413 on the spray plate 411, so that the carbon dioxide in the flue gas reacts fully with the acetic acid / fly ash solution, and the remaining flue gas is discharged from the outlet pipe 3.

[0028] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for capturing carbon dioxide in flue gas, comprising a spray tower (1), an air outlet pipe (3), and a spray mechanism (4), characterized in that: An air inlet pipe (2) is arranged on one side of the spray tower (1); the air outlet pipe (3) is arranged at the top of the spray tower (1); the spray mechanism (4) is arranged inside the spray tower (1), and the spray mechanism (4) sprays a solution to react with carbon dioxide in the flue gas; The spray mechanism (4) comprises a material tank and an atomizing component, wherein the material tank mixes a solution that reacts with carbon dioxide in the flue gas, and the atomizing component atomizes and sprays the solution mixed in the material tank in the spray tower (1); The chemical tank comprises a solution storage tank (401), a liquid replenishing and ash replenishing pipe (402), a motor (403), a water pumping pipe (404), a solution pump (405), a connecting pipe (406), a rotating rod (407) and a stirring rod (408); the connecting pipe (406) is fixedly connected to the other side of the spray tower (1); the solution pump (405) is fixedly connected to the bottom end of the connecting pipe (406); the water pumping pipe (404) is fixedly connected to one side of the solution pump (405); the solution storage tank (401) is fixedly connected to one side of the water pumping pipe (404); the liquid replenishing and ash replenishing pipe (402) is fixedly connected to the top end of the solution storage tank (401); the motor (403) is fixedly connected to the top end of the solution storage tank (401); the rotating rod (407) is fixedly connected to the bottom end of the motor (403); and the stirring rod (408) is fixedly connected to the outer circumferential surface of the rotating rod (407); The atomizing component comprises a cavity (409), a support tube (410), a spray plate (411), a first nozzle (412), a circular hole (413) and a second nozzle (414); the cavity (409) is opened inside the spray tower (1); the support tube (410) is fixedly connected inside the cavity (409); the spray plate (411) is fixedly connected inside the cavity (409); the first nozzle (412) is fixedly connected to the bottom end of the support tube (410); the circular hole (413) is opened at the bottom end of the spray plate (411); and the second nozzle (414) is fixedly connected inside the circular hole (413).

2. The device for capturing carbon dioxide in flue gas according to claim 1, characterized in that: The rotating rod (407) is rotatably connected to the solution storage tank (401), and the connecting pipe (406) is fixedly connected to the supporting pipe (410) and the second nozzle (414).

3. The device for capturing carbon dioxide in flue gas according to claim 1, characterized in that: The spray plate (411) and the circular hole (413) are integrally formed into a honeycomb briquette shape.

Images