Acid flue gas treatment tower with pre-cooling function

Abstract

The utility model discloses an acid flue gas treatment tower with a precooling function, which belongs to the technical field of environmental protection equipment, and comprises a tower body, a precooling area, a gas-liquid contact area and a demisting area are respectively arranged in the tower body from bottom to top, a top tower is arranged above the demisting area, and the top tower is connected with the gas-liquid contact area. A smoke exhaust pipe is arranged in the middle of the upper part of the top tower; the pre-cooling area and the coil pipe type pre-cooler are arranged in the tower body, so that in-situ pre-cooling of high-temperature acidic flue gas in the tower is realized. The flue gas is effectively cooled before entering the core reaction area, so that the evaporation rate of the absorption liquid is remarkably reduced, the gas-liquid contact time is prolonged, and the solubility and reaction rate of the acid gas in the absorption liquid are improved, thereby greatly improving the removal efficiency. Meanwhile, as the evaporation loss is reduced, the required liquid-gas ratio is reduced, the consumption of the alkaline absorbent is reduced, and the operation cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to environmental protection equipment technical field more specifically, relate to a kind of acid flue gas treatment tower with precooling function. BACKGROUND

[0002] The flue gas discharged by nonferrous smelting industrial enterprises during production contains sulfur dioxide (SO2), hydrogen chloride (HCl) and other acidic gases, which are one of the main sources of acid rain and air pollution and must be treated to meet the emission standards. Currently, wet desulfurization / acidity removal technology is one of the most widely used and most efficient methods. Its basic principle is to use alkaline absorbing liquid (such as limestone slurry, sodium hydroxide solution, etc.) to contact with acidic flue gas countercurrently in an absorption tower to generate a neutralization reaction and form corresponding salts, thereby removing the acidic components in the flue gas. However, the flue gas discharged from the process equipment is usually at a high temperature (up to 150-200°C or higher), and when the high-temperature flue gas enters the absorption tower, the sprayed absorbing liquid will quickly evaporate, causing the liquid droplets to become small or even vaporize, which shortens the gas-liquid contact time, reduces the solubility and reaction rate of the acidic gases, and thus affects the removal efficiency. The high-temperature flue gas directly impacts the plastic or glass steel components in the tower, such as the spray layer and demister, which can easily cause material aging, deformation, or even damage, shorten the service life of the equipment, and increase maintenance costs. Therefore, it is necessary to research and improve the structure of the acid flue gas treatment tower with precooling function. SUMMARY

[0003] To solve the problems in the prior art, the purpose of the present utility model is to provide an acid flue gas treatment tower with precooling function, which can solve the problems of reduced absorption efficiency, increased consumption of absorbing agent, and thermal damage to the components in the tower, such as the spray layer and demister, caused by high-temperature flue gas entering the absorption tower. By setting an integrated precooling zone inside the tower body, the high-temperature acidic flue gas is pre-cooled, thereby improving the acidic gas removal efficiency, reducing the operating cost, and prolonging the service life of the equipment.

[0004] To solve the above problems, the utility model adopts the following technical scheme: an acid flue gas treatment tower with precooling function, comprising a tower body, a precooling zone, a gas-liquid contact zone, a demisting zone, and a top tower are arranged inside the tower body from bottom to top, a containing cavity is fixedly arranged inside the precooling zone, a coil type pre-cooler is installed inside the containing cavity, an installation disc is installed inside the gas-liquid contact zone, a gas-liquid inlet is arranged above the installation disc, and a spray head is installed below the installation disc, a baffle type demister is installed inside the demisting zone, and a smoke exhaust pipe is arranged at the upper middle position of the top tower.

[0005] Further, the disc pipe pre-cooler is composed of multiple layers of horizontally coiled cooling water pipes, the water inlet of the cooling water pipe is located at the lower layer, and the water outlet is located at the upper layer.

[0006] Further, the side of the demisting area is provided with a liquid inlet pipe connected to each spray head through a pipeline, and the liquid inlet pipe is connected to an external alkaline absorption liquid supply system.

[0007] Further, the mounting disc is located at the connection between the demisting area and the gas-liquid contact area, and is a hollow structure, one side of the mounting disc is fixedly provided with a connecting port communicating with the inside, and the connecting port is connected to the liquid inlet pipe.

[0008] Further, the gas-liquid inlet and the spray head are oppositely connected, and are provided with multiple groups and are distributed in the upper and lower parts of the mounting disc.

[0009] Further, a liquid collecting groove is arranged at the bottom of the pre-cooling area below the containing cavity, the liquid collecting groove is connected to an external circulating pump through a connecting pipe, and the circulating pump is connected to the external alkaline absorption liquid supply system.

[0010] Further, a controller is arranged at the lower right corner of the pre-cooling area.

[0011] Further, a supporting leg is fixedly arranged below the pre-cooling area, and a smoke inlet pipe is arranged at the middle position below the pre-cooling area.

[0012] Compared with the prior art, the advantages of the utility model lie in that:

[0013] (1) the scheme, by setting the pre-cooling area and the disc pipe pre-cooler in the tower body, realizes the in-situ pre-cooling of the high-temperature acidic flue gas in the tower. The flue gas is effectively cooled before entering the core reaction area (the gas-liquid contact area), significantly reduces the evaporation rate of the absorption liquid, prolongs the gas-liquid contact time, improves the solubility and reaction rate of the acidic gas in the absorption liquid, and greatly improves the removal efficiency. At the same time, due to the reduction of evaporation loss, the required liquid-gas ratio is reduced, the consumption of alkaline absorbent is reduced, and the operation cost is reduced.

[0014] (2) the scheme, by setting the pre-cooling area to pre-cool the flue gas, the flue gas temperature entering the gas-liquid contact area and the demisting area is in the appropriate range, avoiding the direct thermal shock of high-temperature flue gas on the plastic or glass steel material parts such as the spray head, the baffle plate type demister and the like, effectively preventing material aging, deformation and damage, significantly prolonging the service life of the key parts in the tower, and reducing the maintenance and replacement frequency.

[0015] (3) By setting the mounting disc, the particles in the flue gas form an effective barrier, while the gas-liquid inlet and the nozzle are distributed in a ring shape, the absorption liquid is uniformly sprayed in the gas-liquid contact area, and the flue gas needs to pass through the gas-liquid nozzle when rising, the liquid fully covers the flue gas, ensuring that the atomized droplets and the flue gas are fully mixed, and the reaction efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic view of the utility model;

[0017] Figure 2 It is a schematic view of the utility model plane;

[0018] Figure 3 It is a schematic view of the gas-liquid contact area of the utility model;

[0019] Figure 4 It is a schematic view of the tower body split of the utility model;

[0020] Figure 5 It is a schematic view of the inside of the pre-cooling area of the utility model.

[0021] In the drawing: 1, pre-cooling area; 2, gas-liquid contact area; 3, demisting area; 4, top tower; 5, smoke exhaust pipe; 6, liquid inlet pipe; 7, controller; 8, supporting leg; 9, mounting disc; 10, gas-liquid inlet; 11, nozzle; 12, smoke inlet pipe; 13, coil type pre-cooler; 14, containing cavity. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model; Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the scope of protection of the utility model.

[0023] EMBODIMENT

[0024] Please refer to Figures 1-5 An acid flue gas treatment tower with a pre-cooling function, comprising a tower body, the inside of the tower body is provided with a pre-cooling area 1, a gas-liquid contact area 2 and a demisting area 3 from bottom to top, a top tower 4 is installed above the demisting area 3, a smoke exhaust pipe 5 is arranged at the upper middle position of the top tower 4, a liquid inlet pipe 6 is installed on the side of the demisting area 3, a containing cavity 14 made of stainless steel is fixedly arranged in the inside of the pre-cooling area 1, which has good corrosion resistance, a coil type pre-cooler 13 is installed in the inside of the containing cavity 14, a controller 7 is installed at the lower right corner of the pre-cooling area 1, a mounting disc 9 is installed in the inside of the gas-liquid contact area 2, a gas-liquid inlet 10 is fixedly arranged above the mounting disc 9, and a nozzle 11 is installed below the gas-liquid inlet 10.

[0025] The coil type pre-cooler 13 is composed of multiple layers of horizontally coiled cooling water pipes, the water inlet of the cooling water pipes is located at the lower layer, the water outlet is located at the upper layer, the water inlet and the water outlet respectively penetrate the pre-cooling area 1 and are connected with external pipelines, the coil type pre-cooler 13 forms counter-flow heat exchange, and the heat exchange efficiency is improved.

[0026] The baffle type demister is installed in the inside of the demisting area 3, and is used for capturing fine liquid droplets entrained in the flue gas, so as to ensure that the humidity of the discharged flue gas meets the standard.

[0027] The installation disc 9 is located at the connection between the demisting area 3 and the gas-liquid contact area 2, is a hollow structure, the inside hollow layer is a space for liquid flow, the upper part is connected with each gas-liquid inlet 10, and the lower part is connected with each spray head 11, one side of the installation disc 9 is fixedly provided with a connecting port, the connecting port is connected with the hollow layer and is connected with the liquid inlet pipe 6 through a pipeline, so that the liquid can enter the hollow layer, the liquid inlet pipe 6 is connected with an external alkaline absorption liquid supply system, the gas-liquid inlet 10 and the spray head 11 are provided with multiple groups and are distributed in the upper and lower parts of the installation disc 9 in a surrounding manner, the flue gas after cooling enters this area, is countercurrently contacted with the alkaline absorption liquid sprayed from the spray head 11, passes through the liquid film in the spraying area, and neutralization reaction occurs, so that the acidic gas is fully removed. The slurry after reaction falls into the bottom of the tower.

[0028] The supporting leg 8 is fixedly arranged below the pre-cooling area 1, the smoke inlet pipe 12 is arranged at the middle position below the pre-cooling area 1 and is connected with the containing cavity 14, the supporting leg 8 is used for supporting the whole tower body. The inside bottom of the containing cavity 14 of the pre-cooling area 1 is provided with a liquid collecting groove which is a groove surrounding the smoke inlet pipe 12, which is a common structure of a treatment tower and is omitted in the figure. The liquid collecting groove is connected with an external circulating pump through a pipeline and is connected with an external alkaline absorption liquid supply system and is used for collecting the slurry falling into the bottom of the tower.

[0029] In use: the high-temperature acidic flue gas to be treated enters the tower body from the flue gas inlet pipe 12. The flue gas first flows upward in the pre-cooling zone 1 and is subjected to indirect heat exchange with the coil pre-cooler 13 in the containing cavity 14. Cooling water enters the coil pre-cooler 13 from the water inlet of an external system, flows through the coil, and then flows out from the water outlet, thereby taking away the heat of the flue gas and significantly reducing the temperature of the flue gas to 60-80 DEG C. The cooled flue gas continues to flow upward into the gas-liquid contact zone 2. At this time, the alkaline absorption liquid enters the inside of the mounting disc 9 through the liquid inlet pipe 6 and the connecting port, and is then distributed to each spray head 11 through the mounting disc 9 and sprayed downward. The flue gas and the sprayed absorption liquid are countercurrently contacted, and due to the blocking of the mounting disc 9, the flue gas must pass right below the spray head, so that the neutralization reaction is fully carried out and the acidic gases such as SO2 and HCl are removed. The reacted slurry falls into the tower bottom collecting tank, most of which is pressurized by a circulating pump and then recycled, and a small amount of it is discharged as gypsum slurry for treatment. The purified flue gas carrying a small amount of liquid droplets enters the demisting zone 3 and is purified by the baffle demister, and finally, the clean flue gas is discharged from the flue gas discharge pipe 5 above the top tower 4. The controller 7 can monitor the running state of the pre-cooling zone 1 in real time, so as to ensure stable and efficient operation of the system.

[0030] Finally, it should be noted that in the description of the present application, it should be noted that the terms "vertical", "upper", "lower", "horizontal" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the device or element indicated or implied to have a specific orientation, structure and operation, and therefore cannot be understood as limiting the present application.

[0031] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "set", "mount", "connect", "connect" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] The above is only a preferred specific embodiment of the present application; however, the protection scope of the present application is not limited to this. Any skilled in the art can make equivalent replacement or change according to the technical scheme of the present application and the improved concept thereof within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An acidic flue gas treatment tower with pre-cooling function, comprising a tower body, wherein the interior of the tower body is provided with a pre-cooling zone (1), a gas-liquid contact zone (2), a demisting zone (3), and a top tower (4) from bottom to top, characterized in that: The precooling zone (1) is fixedly provided with a receiving cavity (14), and a coil-type precooler (13) is installed inside the receiving cavity (14). The gas-liquid contact zone (2) is provided with an installation plate (9), and a gas-liquid inlet (10) is provided above the installation plate (9) and a nozzle (11) is installed below it. The demisting zone (3) is provided with a baffle plate type demister. The top tower (4) is provided with a flue pipe (5) at the middle position above it.

2. The acidic flue gas treatment tower with pre-cooling function according to claim 1, characterized in that: The coil-type precooler (13) consists of multiple layers of horizontally coiled cooling water pipes, with the inlet of the cooling water pipe located on the lower layer and the outlet located on the upper layer.

3. The acidic flue gas treatment tower with pre-cooling function according to claim 1, characterized in that: The side of the demisting zone (3) is equipped with a liquid inlet pipe (6), which is connected to each nozzle (11) through a pipe. The liquid inlet pipe (6) is connected to an external alkaline absorbent supply system.

4. The acidic flue gas treatment tower with pre-cooling function according to claim 3, characterized in that: The mounting plate (9) is located at the connection between the demisting zone (3) and the gas-liquid contact zone (2), and has a hollow structure. A connection port communicating with the interior is fixed on one side of the mounting plate (9), and the connection port is connected to the liquid inlet pipe (6).

5. An acidic flue gas treatment tower with pre-cooling function according to claim 1, characterized in that: The gas-liquid inlet (10) and the nozzle (11) are connected to each other and are provided in multiple groups, which are distributed in a ring around the upper and lower parts of the mounting plate (9).

6. The acidic flue gas treatment tower with pre-cooling function according to claim 1, characterized in that: The bottom of the precooling zone (1) is equipped with a liquid collection tank located below the receiving cavity (14). The liquid collection tank is connected to an external circulation pump through a connecting pipe and is connected to an external alkaline absorption liquid supply system through the circulation pump.

7. An acidic flue gas treatment tower with pre-cooling function according to claim 1, characterized in that: A controller (7) is installed at the lower right corner of the precooling zone (1).

8. An acidic flue gas treatment tower with pre-cooling function according to claim 1, characterized in that: A support leg (8) is fixedly provided below the precooling zone (1), and a smoke inlet pipe (12) is installed in the middle position below the precooling zone (1).

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