Dynamic wave tower for sulfur dioxide flue gas purification

Abstract

The invention discloses a dynamic wave tower for sulfur dioxide flue gas purification, and belongs to the technical field of sulfuric acid preparation. Comprising an absorption demisting tower, a dynamic wave washing pipe and a head tank, wherein the dynamic wave washing pipe sequentially comprises a lower bent pipe section, a straight pipe section and an upper bent pipe section; the lower bent pipe section is connected with the absorption demisting tower, and a dynamic wave nozzle is arranged at the upper part in the lower bent pipe section; an anti-corrosion adhesive layer is arranged on the inner wall of the straight pipe section and comprises a cylinder body, an expansion part and a necking part; a feeding hole is formed in the outer wall of the expansion part, and an acid-resistant patch layer is arranged on the inner side of the anti-corrosion adhesive layer on the expansion part; a cooling water jacket is arranged on the outer wall of the barrel, and an acid-proof brick layer is arranged on the inner side of the anti-corrosion adhesive layer; the acid-proof brick layer extends upwards to form an extension part; the upper end of the extension part is lower than the top of the expansion part, the inner diameter of the extension part is gradually reduced from top to bottom, and the outer side of the extension part and the inner wall of the expansion part form an overflow groove; the head tank and the dynamic wave spray head are connected with an outlet of the dynamic wave pump, the feed port is connected with the head tank, and the dynamic wave spray head upwards sprays dilute acid to the extension part.

Description

Technical Field

[0001] The invention belongs to the technical field of sulfuric acid preparation, and in particular relates to a power wave tower for sulfur dioxide flue gas purification, which can cope with abnormal situations such as power outages and equipment failures. Background Art

[0002] Sulfuric acid is an active binary inorganic strong acid that can react with many metals. High concentrations of sulfuric acid have strong water absorption and can be used as a dehydrating agent to carbonize wood, paper, cotton and linen fabrics, biological skins and flesh and other carbohydrate-containing materials. When mixed with water, it also releases a lot of heat energy. It is highly corrosive and oxidizing, so it should be used with caution. It is an important industrial raw material that can be used to make fertilizers, drugs, explosives, pigments, detergents and batteries, etc. It is also widely used in industries such as oil purification, metal smelting and dyes. It is often used as a chemical reagent and can be used as a dehydrating agent and sulfonating agent in organic synthesis.

[0003] The preparation process of sulfuric acid includes four parts: roasting, gas purification, conversion and drying absorption. The roasting process is to generate sulfur dioxide gas from powdered pyrite in a boiling furnace. The sulfur dioxide gas produced by the boiling furnace is sent to the conversion section after heat recovery, dust removal, washing and drying. After multi-stage heat exchange and multi-stage conversion, it is finally absorbed to obtain high-concentration sulfuric acid.

[0004] Flue gas purification methods are mainly divided into two categories: wet and dry. Wet purification equipment commonly uses ventrilo scrubbers and spray scrubbers. Dynamic wave flue gas scrubbers are a form of scrubber, which are widely used in industrial flue gas purification, especially dust removal and cooling. Its principle is that the flue gas enters from the top of the dynamic wave scrubber, flows from top to bottom, collides with the scrubbing liquid sprayed from bottom to top by the reverse nozzle, and generates a turbulent zone for rapid and continuous gas-liquid exchange, and pollutants enter the liquid phase. When the momentum of the flue gas and the liquid is balanced, the liquid falls into the liquid storage tank, and the flue gas is discharged after passing through the demister.

[0005] For example, the patent with application number CN201510174914.4 discloses an induced dynamic wave washing tower device, including an absorption and defogger tower, the absorption and defogger tower is provided with a smoke outlet at the top, a dynamic wave washing pipe is connected to the side, an absorption liquid storage chamber is provided at the bottom, a smoke inlet is provided at the top of the dynamic wave washing pipe, and a downstream nozzle and a reverse nozzle are provided in the dynamic wave washing pipe. The droplets sprayed by the downstream nozzle are in the same direction as the smoke flow, forming an upper and lower impact with the reverse nozzle, and a foam induction ring is provided between the downstream nozzle and the reverse nozzle.

[0006] The temperature of sulfur dioxide flue gas is as high as about 260°C, and the sprayed liquid is dilute acid. The material of the power wave washing pipe is usually fiberglass. During the normal spraying process of the power wave nozzle, the dilute acid cools the flue gas, and the power wave washing pipe has strong corrosion resistance. However, once the power is cut off, the flue gas cannot be cooled. Under acidic conditions, the power wave washing pipe will be corroded and burned by high temperature. After several power outages (usually 3-4 times), the power wave washing pipe needs to be replaced or repaired. When the power wave washing pipe is repaired, the sulfuric acid production line will stop, which is not only time-consuming and labor-intensive (such as the need to exhaust the gas), but also reduces production capacity. Summary of the invention

[0007] In order to solve the above problems, the embodiment of the present invention provides a power wave tower for sulfur dioxide flue gas purification, in which the straight pipe section and the upper curved pipe section are replaced, and the upper curved pipe section is made of carbon steel that is resistant to high temperatures but not acid; the structure and material of the straight pipe section are adjusted to be acid-resistant and high-temperature-resistant, and can also cope with abnormal situations. The technical solution is as follows: The embodiment of the present invention provides a power wave tower for sulfur dioxide flue gas purification, including an absorption and defogger tower and a power wave washing pipe thereon, wherein a power wave nozzle is provided upwardly at the lower part of the power wave washing pipe, and the power wave nozzle is connected to the bottom of the absorption and defogger tower through a pipeline with a power wave pump; the power wave tower also includes a high-level tank, which is located above the power wave washing pipe; the power wave washing pipe is composed of a lower curved pipe section, a straight pipe section and an upper curved pipe section from bottom to top; the lower end of the lower curved pipe section is connected to the lower part of the absorption and defogger tower, and the upper part thereof is vertically arranged upwardly, and its material is glass fiber reinforced plastic; the material of the upper curved pipe section is carbon steel; the power wave nozzle is located in the upper part of the lower curved pipe section; the material of the straight pipe section is carbon steel, and an anti-corrosion rubber layer 8 is provided on its inner wall, which includes a vertically arranged cylinder 1, an upper end outer side of the cylinder 1 and a cylindrical body 2; An expansion part 2 is arranged on the axis and a neck part 3 is arranged at the bottom of the cylinder 1; a plurality of feed ports 4 are tangentially arranged on the outer wall of the expansion part 2, the top of which is connected to the upper curved pipe section, and an acid-resistant patch layer 13 is arranged on the inner side of the anti-corrosion rubber layer 8 thereon; a cooling water jacket 5 is arranged on the outer wall of the cylinder 1, and an acid-resistant brick layer 9 is arranged on the inner side of the anti-corrosion rubber layer 8; the acid-resistant brick layer 9 extends upward to extend into the expansion part 2 to form an extension part 6; the upper end of the extension part 6 is lower than the top of the expansion part 2, and its inner diameter gradually decreases from top to bottom, and its outer side and the inner wall of the expansion part 2 form an annular overflow groove 7; the liquid overflowing from the overflow groove 7 flows along the inner wall of the acid-resistant brick layer 9, the high-level tank is connected to the outlet of the power wave pump through a pipeline, the feed port 4 is connected to the high-level tank through a pipeline, and the dilute acid sprayed upward by the power wave nozzle reaches the extension part 6.

[0008] Furthermore, an upper flange 10 is coaxially provided at the top of the expanded portion 2 in the embodiment of the present invention, and the upper flange 10 is flange-connected to the upper bend pipe section; the inner diameter of the neck portion 3 gradually decreases from top to bottom and a lower flange 11 is coaxially provided at its bottom end, and the lower flange 11 is connected to the lower bend pipe section.

[0009] Furthermore, a plurality of fixing ears 12 are evenly distributed on the outer walls of the middle and upper parts of the cylinder 1 in the embodiment of the present invention, and the fixing ears 12 are fixed on the mounting platform.

[0010] Specifically, the length of the straight pipe section in the embodiment of the present invention is 6.0-7.5m, and its inner diameter is 1.2-1.8m; the distance between the upper end of the extension part 6 and the top of the expanded part 2 is 60-90mm.

[0011] Specifically, the number of the feed ports 4 in the embodiment of the present invention is four, and the four feed ports 4 are evenly distributed and tangentially arranged in the same direction.

[0012] The anti-corrosion rubber layer 8 in the embodiment of the present invention is fixed on the straight pipe section by vulcanization. The material of the anti-corrosion rubber layer 8 is acid-resistant and heat-resistant rubber, and the thickness is 3-6 mm.

[0013] Among them, the thickness of the acid-resistant brick layer 9 in the embodiment of the present invention is 200-270mm, which is made of knife-edge bricks through mortar; the acid-resistant patch layer 13 is made of patches pasted on the inner side of the corresponding anti-corrosion adhesive layer 8 through mortar; the acid-resistant brick layer 9 and the acid-resistant patch layer 13 are made of the same material. The technical solution provided by the embodiment of the present invention has the following beneficial effects: the embodiment of the present invention provides a power wave tower for sulfur dioxide flue gas purification, the straight pipe section and the upper bend pipe section are replaced, and the upper bend pipe section adopts carbon steel material that is resistant to high temperature but not acid; the structure and material of the straight pipe section are adjusted to be acid-resistant and high-temperature-resistant, and can also cope with abnormal situations. In this patent, the straight pipe section is basically composed of a cooling water jacket, a steel shell, an anti-corrosion rubber layer and an acid-resistant brick layer from outside to inside, which achieves acid resistance and high temperature resistance. In the event of an abnormality such as a power outage, the power wave nozzle stops working, and the overflow tank still overflows to cool the inner wall of the straight pipe section. The overflowing acid can reduce the temperature of the flue gas (such as to 150-200°C, which can be reduced to below 60°C under normal circumstances). Due to the power outage, the flue gas (fan stop) will also stop flowing quickly, and the flue gas temperature will continue to slowly decrease. The adjusted straight pipe section is resistant to acid and temperature, so at this temperature, there is basically no damage to the straight pipe section. After being used for five and a half years, this power wave tower has experienced more than twenty power outages and can still be used normally without the need for replacement or repair, thus ensuring production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1Schematic diagram of liquid flow in a power wave tower for sulfur dioxide flue gas purification in an embodiment of the present invention; Figure 2 It is a structural diagram of a straight pipe section; Figure 3 It is a top view of the straight pipe section; Figure 4 It is a structural schematic diagram of the upper curved pipe section.

[0015] In the figure: 1 cylinder, 2 expansion part, 3 neck part, 4 feed port, 5 cooling water jacket, 6 extension part, 7 overflow trough, 8 anti-corrosion rubber layer, 9 acid-resistant brick layer, 10 upper flange, 11 lower flange, 12 fixing ear, 13 acid-resistant patch layer. DETAILED DESCRIPTION

[0016] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0017] Example 1 See also Figure 1-4 , Example 1 provides a power wave tower for sulfur dioxide flue gas purification, including an absorption and defogger tower, a power wave washing pipe and a high-level tank. The high-level tank is located above the power wave washing pipe. The power wave washing pipe is composed of a lower bend section, a straight pipe section and an upper bend section from bottom to top. The upper bend section enters the sulfur dioxide flue gas and is a high-temperature section; the temperature of the sulfur dioxide flue gas is as high as about 260°C, and it is a dry gas. The straight pipe section is medium-temperature and short, and the sulfur dioxide flue gas flows downward, and the temperature gradually decreases. It is a humid gas. The gas has a high temperature and is humid, and is the most corrosive. The lower bend section is a low-temperature section, and the flue gas is a humid gas, but the temperature is low.

[0018] Among them, the lower end of the lower curved pipe section is connected to the lower part of the absorption and demisting tower, and its upper part is vertically arranged upward. It is made of fiberglass (low temperature, mainly considering acid corrosion resistance), and a dynamic wave nozzle is arranged on the upper part. The material of the upper curved pipe section is carbon steel (high temperature dry gas, mainly considering high temperature resistance). The straight pipe section is made of carbon steel, and an anti-corrosion rubber layer 8 is arranged on its inner wall, which includes a vertically arranged cylinder 1, an expansion part 2 coaxially arranged outside the upper end of the cylinder 1, and a neck 3 at the bottom of the cylinder 1. The anti-corrosion rubber layer 8 has multiple functions: one is anti-corrosion, the second is to prevent acid from directly contacting the carbon steel shell, and the third is to facilitate the adhesion of the acid-resistant patch layer 13 and the acid-resistant brick layer 9 (connected and fixed by glue mud). The straight pipe section must consider both high temperature resistance and acid corrosion resistance, and at the same time, rigidity must be considered for installation. A plurality of feed ports 4 are tangentially arranged on the outer wall of the expanded part 2 (in which the liquid forms a vortex), the top of which is connected to the upper curved pipe section, and an acid-resistant patch layer 13 is arranged on the inner side of the anti-corrosion rubber layer 8 thereon. The plurality of feed ports 4 are evenly distributed. The inner diameter of the neck portion 3 gradually decreases from top to bottom, and its bottom end is connected to the lower curved pipe section. A cooling water jacket 5 is arranged on the outer wall of the cylinder 1, and an acid-resistant brick layer 9 is arranged on the inner side of the anti-corrosion rubber layer 8 thereof. The acid-resistant brick layer 9 extends upward to extend into the expanded part 2 to form an extension portion 6. The upper end of the extension portion 6 is lower than the top of the expanded part 2, and its inner diameter gradually decreases from top to bottom to form a conical structure, and its outer side and the inner wall of the expanded part 2 form an annular overflow groove 7 (the bottom and outer side of which are the acid-resistant patch layer 13, and the inner side is the acid-resistant brick layer 9). The conical structure has multiple functions: one is that the top of the power wave nozzle needs a larger space to spread out, and the other is to facilitate the vortex flow of the liquid in the overflow groove 7. The liquid overflowing from the overflow tank 7 flows along the inner wall of the acid-resistant brick layer 9 to form an inner water-cooled wall to reduce the temperature of the anti-corrosion rubber layer 8 (which is prone to aging at high temperatures). The bottom of the absorption and demisting tower is connected to the inlet of the power wave pump through a pipeline; the outlet of the power wave pump is divided into two outputs, one is connected to the high-level tank through a pipeline to ensure that there is a predetermined amount of liquid in the high-level tank, and the other is connected to the power wave nozzle through a pipeline. The feed port 4 is connected to the high-level tank through a pipeline. The power wave nozzle is arranged vertically, and the dilute acid it sprays upward reaches the extension part 6 (specifically the top of the extension part 6).

[0019] Further, see Figure 2-3 The top of the expanded portion 2 in the embodiment of the present invention is coaxially provided with an upper flange 10, which is flange-connected to the upper curved pipe section. The bottom end of the constricted portion 3 is coaxially provided with a lower flange 11, which is connected to the lower curved pipe section.

[0020] Further, see Figure 2In the embodiment of the present invention, a plurality of fixing ears 12 are evenly distributed on the middle outer wall of the cylinder 1 (located on the same horizontal plane, specifically arranged on the cooling water jacket 5), and a plurality of fixing ears 12 are evenly distributed on the outer wall of the upper part of the cylinder 1 (located on the same horizontal plane, and the upper ends thereof are fixed to the bottom of the expanded portion 2), and the fixing ears 12 are fixed on the mounting platform.

[0021] Specifically, the length of the straight pipe section in the embodiment of the present invention is 6.0-7.5m, and its inner diameter is 1.2-1.8m. The distance between the upper end of the extension part 6 and the top of the expanded part 2 is 60-90mm.

[0022] The anti-corrosion rubber layer 8 in the embodiment of the present invention is fixed on the straight pipe section by vulcanization. The material of the anti-corrosion rubber layer 8 is acid-resistant and heat-resistant rubber, and the thickness is 3-6 mm.

[0023] Among them, the thickness of the acid-resistant brick layer 9 in the embodiment of the present invention is 200-270mm, which is made of knife-edge bricks (acid-resistant material, a conventional structure of the spray tower, detailed description is omitted in this embodiment) through cement. The acid-resistant patch layer 13 is made of patches (acid-resistant material, a conventional structure of the spray tower, detailed description is omitted in this embodiment, and the thickness is greater than 20mm) pasted on the inner side of the corresponding anti-corrosion adhesive layer 8 through cement. The acid-resistant brick layer 9 and the acid-resistant patch layer 13 are made of the same material.

[0024] Example 2 See also Figure 2 Example 2 provides a dynamic wave tower for sulfur dioxide flue gas purification, and its structure is basically the same as that of Example 1, except that: the number of feed ports 4 in this embodiment is four, and the four feed ports 4 are tangentially arranged in the same direction (clockwise or counterclockwise).

[0025] Example 3 Example 3 provides a power wave tower for sulfur dioxide flue gas purification, and its structure is basically the same as that of Example 2, except that: the power wave tower in this example is a structure in a 200,000-ton sulfuric acid production system. The length of the straight pipe section is 6760mm; the inner diameter of the expansion section 2 is 2070mm, and its length is 400mm; the inner diameter of the cylinder 1 is 1540mm; the length of the neck section 3 is 230mm, and the inner diameter of its lower end is 1300mm; the length of the extension section 6 is 378mm, and the inner diameter of its top end is 1630mm; the diameter of the feed port 4 is 60mm. The thickness of the anti-corrosion rubber layer 8 is 4mm. The specifications of the acid-resistant brick layer 9 are 230mm*113mm*65mm and 230mm*113mm*55mm.

[0026] This power wave tower has been in operation since April 2019, and has not been significantly corroded and can still be used normally. The abnormal conditions experienced are shown in Table 1: Table 1

[0027] Among them, in Table 1, short power outage means power outage time is less than or equal to 5 minutes, and long power outage means power outage time is greater than 5 minutes. As can be seen from Table 1, in about five and a half years, there have been a total of 23 power outages, 17 short power outages and 6 long power outages, none of which have affected the power wave tower, and the power wave tower can be used normally.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power wave tower for sulfur dioxide flue gas purification, comprising an absorption and demisting tower and a power wave washing pipe thereon, wherein a power wave nozzle is upwardly provided at the lower part of the power wave washing pipe, and the power wave nozzle is connected to the bottom of the absorption and demisting tower through a pipeline with a power wave pump; characterized in that: The power wave tower also includes a high-level tank, which is located above the power wave washing pipe; the power wave washing pipe is composed of a lower curved pipe section, a straight pipe section and an upper curved pipe section from bottom to top; the lower end of the lower curved pipe section is connected to the lower part of the absorption and demisting tower, and the upper part is vertically arranged upward, and its material is glass fiber reinforced plastic; the material of the upper curved pipe section is carbon steel; the power wave nozzle is located in the upper part of the lower curved pipe section; The straight pipe section is made of carbon steel, and an anti-corrosion rubber layer (8) is provided on its inner wall. The straight pipe section comprises a vertically arranged cylinder (1), an expansion portion (2) coaxially arranged outside the upper end of the cylinder (1), and a neck portion (3) at the bottom of the cylinder (1); a plurality of feed ports (4) are tangentially provided on the outer wall of the expansion portion (2), and the top of the expansion portion (2) is connected to the upper curved pipe section, and an acid-resistant patch layer (13) is provided on the inner side of the anti-corrosion rubber layer (8) thereon; a cooling water jacket (5) is provided on the outer wall of the cylinder (1), and an acid-resistant brick layer (9) is provided on the inner side of the anti-corrosion rubber layer (8); The acid-resistant brick layer (9) extends upward to extend into the expanded portion (2) to form an extension portion (6); the upper end of the extension portion (6) is lower than the top of the expanded portion (2), and its inner diameter gradually decreases from top to bottom, and its outer side and the inner wall of the expanded portion (2) form an annular overflow groove (7); the liquid overflowing from the overflow groove (7) flows along the inner wall of the acid-resistant brick layer (9), the high-level tank is connected to the outlet of the power wave pump through a pipeline, the feed port (4) is connected to the high-level tank through a pipeline, and the dilute acid sprayed upward by the power wave nozzle reaches the extension portion (6).

2. The power wave tower for sulfur dioxide flue gas purification according to claim 1, characterized in that: An upper flange (10) is coaxially arranged at the top of the expanded portion (2), and the upper flange (10) is flange-connected to the upper curved pipe section; the inner diameter of the neck portion (3) gradually decreases from top to bottom and a lower flange (11) is coaxially arranged at its bottom end, and the lower flange (11) is connected to the lower curved pipe section.

3. The power wave tower for sulfur dioxide flue gas purification according to claim 1, characterized in that: A plurality of fixing ears (12) are evenly distributed on the outer walls of the middle and upper parts of the cylinder (1), and the fixing ears (12) are fixed on the installation platform.

4. The power wave tower for sulfur dioxide flue gas purification according to claim 1, characterized in that: The length of the straight pipe section is 6.0-7.5 m, and its inner diameter is 1.2-1.8 m; the distance between the upper end of the extension part (6) and the top of the expanded part (2) is 60-90 mm.

5. The power wave tower for sulfur dioxide flue gas purification according to claim 1, characterized in that: The number of the feed ports (4) is four, the four feed ports (4) are evenly distributed and are tangentially arranged in the same direction.

6. The power wave tower for sulfur dioxide flue gas purification according to claim 1, characterized in that: The anti-corrosion rubber layer (8) is fixed on the straight pipe section by vulcanization, and its material is acid-resistant and heat-resistant rubber, and its thickness is 3-6 mm.

7. The power wave tower for sulfur dioxide flue gas purification according to claim 1, characterized in that: The acid-resistant brick layer (9) has a thickness of 200-270 mm and is formed by knife-edge bricks laid with glue; the acid-resistant patch layer (13) is formed by pasting patches on the inner side of the corresponding anticorrosive adhesive layer (8) with glue; the acid-resistant brick layer (9) and the acid-resistant patch layer (13) are made of the same material.

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