Acid-resistant and alkali-resistant glass-lined reaction kettle

Abstract

The invention relates to the technical field of production of reaction kettles, in particular to a production process of an acid-resistant and alkali-resistant glass-lined reaction kettle. Comprising the following steps: (1) preparing a steel frame structure for carrying a glass-lined reaction kettle; (2) preparing a glass-lined reaction kettle base material; (3) processing and molding in a glass-lined reaction kettle; and (4) assembling, processing and optimizing spare and accessory parts of the glass-lined reaction kettle. By changing the production process of the glass-lined reaction kettle and adding one or more additives of the lithium carbonate, the silicon oxide, the zirconium oxide, the titanium oxide, the cobalt oxide, the yttrium oxide and the nickel particles in the glass-lined production process, the acid and alkali corrosion resistance of the obtained reaction kettle is obviously improved compared with that of a commercially available glass-lined reaction kettle.

Description

Technical Field

[0001] The present invention relates to the technical field of the production of reaction kettles, and particularly relates to a production process of an acid- and alkali-resistant glass-lined reaction kettle. Background Art

[0002] Due to its excellent acid- and alkali-corrosion resistance, abrasion resistance, easy cleaning, and insulation properties, glass-lined reaction kettles are used for the storage of hydrochloric acid, sulfuric acid, and various organic solvents. Moreover, compared with stainless steel products of the same specification, glass-lined reaction kettles have obvious cost advantages, so they are widely used in industrial production fields such as chemical industry, medicine, and food. The glaze of the glass-lined reaction kettle is composed of a structure in which silicon atoms and oxygen atoms are disorderly arranged, with relatively high brittleness and poor abrasion resistance. When the glaze layer is damaged, the metal matrix in the reaction kettle is quickly corroded, resulting in perforation and leakage of the reaction kettle.

[0003] During the use of glass-lined reaction kettles, metal matrix corrosion usually occurs, such as jacket corrosion, inner cylinder metal matrix corrosion, etc.; the glass-lined layer is corroded due to being hit, scratched by hard objects, charge breakdown, etc. At present, for the corrosion situation of glass-lined reaction kettles, the preventive measures mainly include strengthening the protection of the glass-lined layer in the tank, correctly dredging the discharge port, paying attention to the feeding of materials, and feeding materials for production according to requirements. The firing process during the firing process has a close influence on the density of the porcelain glaze and the steel plate. In the manufacturing process of existing traditional glass-lined reaction kettles, there are defects such as inaccurate control of the firing temperature and time of the reaction kettle and uneven thickness of the glass-lined reaction kettle, resulting in local cracks and porcelain explosion under the action of external force or internal stress during the use of the glass-lined reaction kettle, endangering production safety. Summary of the Invention

[0004] Aiming at the problems existing in the background art, the present invention provides a production process of an acid- and alkali-resistant glass-lined reaction kettle. The preparation process of the present invention improves the mechanical properties of the glass lining and prolongs the service life of the reaction kettle.

[0005] To achieve the above object, the present invention provides the following technical solutions

[0006] (1) Preparation of the steel frame structure carrying the glass-lined reaction kettle. The support is composed of a round steel pipe, a backing plate, a bottom plate, and anchor bolts.

[0007] (2) Preparation of the base material of the glass-lined reaction kettle. Select stainless steel 316L, polish and clean, cut, roll, and weld.

[0008] (3) Processing and forming of the glass-lined reaction kettle. Introduce metal additives into the glass lining enamel powder to increase the acid- and alkali-corrosion resistance of the reaction kettle.

[0009] (4) Assembly and processing optimization of the spare parts of the glass-lined reaction kettle.

[0010] Preferably, the steel frame structure carrying the reactor adopts a triangle. Referring to "Vessel Supports - Part 4: Supported Supports" (NB / T 47065.4-2018), the round steel pipe uses No. 10 steel, and continuous welding is adopted between the backing plate on the upper part of the support and the container shell.

[0011] Preferably, the preparation process of the enamel reactor substrate is as follows:

[0012] (1) Select stainless steel 316L as the reactor substrate, and perform pretreatment such as grinding and cleaning on the surface of stainless steel 316L with sandpaper and acetone. Deburr, remove oil stains and rust on the surface, and dry and store for later use.

[0013] (2) Press the steel plate into a baffle with a jig and weld it to the inner wall of the reactor.

[0014] Preferably, the preparation steps for processing and forming in the enamel reactor are as follows:

[0015] (1) Add water to the enamel primer and stir evenly, then spray it on the steel matrix of the reactor and fire it to obtain the enamel primer.

[0016] (2) Uniformly mix the additives in the enamel topcoat powder by mechanical stirring, mix the mixed enamel glaze and water in a ratio of 2:1 to form a slurry, and stir for 30 min.

[0017] (3) Pour the mixed glaze slurry into a spray gun, spray the slurry on the steel matrix with an enamel primer layer, and let it air dry naturally in a ventilated and cool place for 24 h after spraying.

[0018] (4) Then fire it in a muffle furnace at 880 °C for 15 min.

[0019] Further preferably, the firing conditions in step (1) are firing at 930 °C for 30 min and firing 3 - 4 times.

[0020] Further preferably, the additives in step (2) are one or more of lithium carbonate, silicon oxide, zirconium oxide, titanium oxide, cobalt oxide, yttrium oxide, nickel particles, and the addition amount is 3 wt.%.

[0021] Further preferably, the slurry spraying conditions in step (3) are connecting the spray gun to a compressed air source and adopting a spraying pressure of 0.6 MPa; by controlling the spraying height and cycle (spraying from left to right as one cycle), ensure that the enamel layer has the same thickness.

[0022] Preferably, the part assembly and optimization treatment of the enamel reactor include:

[0023] (1) Seal ring design, adopt POM polyoxymethylene soft seal, and apply high-vacuum sealant during assembly to improve the sealing performance of the reactor body.

[0024] (2) Wipe the assembled glass-lined reactor with a soft cloth to remove visible dirt during the production process.

[0025] Compared with the existing technology, the present invention has the following beneficial effects:

[0026] In view of the fact that glass lining, as a brittle material, has high crack sensitivity and insufficient mechanical properties, which easily lead to porcelain explosion and fracture of the glass-lined reactor under the action of external force, internal stress, etc., thus affecting production safety. The present invention studies from the aspect of acid and alkali corrosion resistance by adding nickel particles and silicon oxide particles to the glass-lined glaze of the reactor. The acid and alkali corrosion resistance rate of the reactor is significantly improved compared with the currently marketed glass-lined reactors. In addition, heat preservation or slow cooling measures are adopted for the cooling of semi-finished products to ensure the smooth progress of the adherence process. Specific embodiments

[0027] The embodiments of the technical solution of the present invention will be described in detail below in conjunction with the embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, so they are only examples and cannot be used to limit the protection scope of the present invention.

[0028] It should be noted that the experimental methods used in the implementation examples are all conventional methods unless otherwise specified; the materials, reagents, etc. used, unless otherwise specified, can be obtained from commercial channels.

[0029] In the present invention, unless otherwise specified, all the technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0030] In the present invention, unless otherwise specified, all the steps mentioned herein can be carried out in sequence or randomly, but preferably in sequence; for example, the method includes steps (a) and (b), which means that the method can include steps (a) and (b) carried out in sequence, or can also include steps (b) and (a) carried out in sequence; for example, it is mentioned that the method may further include step (c), which means that step (c) can be added to the method in any order. For example, the method can include steps (a), (b) and (c), or can also include steps (a), (c) and (b), or can also include steps (c), (a) and (b), etc.

[0031] In the present invention, without special instructions, the specific numerical values and specific substances in the embodiments herein can be combined with other features in the description part of this article; for example, if the description in the specification mentions that the reaction temperature is 10 - 100 °C, and the reaction temperature mentioned in the embodiment is 20 °C, then it can be considered that the ranges of 10 - 20 °C, or 20 - 100 °C have been specifically disclosed herein, and these ranges can be combined with other features in the description part to form new technical solutions.

[0032] Example 1

[0033] 1. According to the design requirements, build a steel frame carrying a reaction kettle, using a triangle. The round steel pipe uses No. 10 steel. The support is composed of a round steel pipe, a backing plate, a bottom plate, and anchor bolts. Continuous welding is used between the backing plate on the upper part of the support and the container shell.

[0034] 2. Select stainless steel 316L as the base material of the reaction kettle, and perform pre - treatments such as grinding and cleaning on the surface of stainless steel 316L with sandpaper and acetone. Deburr, remove oil stains and rust on the surface, and dry and store for later use. Press the steel plate into a baffle with a jig and weld it on the inner wall of the reaction kettle.

[0035] 3. Stir the enamel primer evenly with water and spray it on the steel matrix of the reaction kettle. Fire it at 930 °C for 30 min and fire it 3 times to obtain the enamel primer. Uniformly mix cobalt oxide in the enamel topcoat powder by mechanical stirring. Mix the mixed enamel and water in a ratio of 2:1 to form a slurry and stir for 30 min. Pour the mixed slurry into a spray gun, connect the spray gun to a compressed air source, and use a spraying pressure of 0.6 MPa; by controlling the spraying height and cycle (spraying from left to right as one cycle), ensure that the enamel layer has the same thickness. Spray the slurry on the steel matrix with the primer layer, and after spraying, let it air - dry naturally in a ventilated and shady place for 24 h. Then fire it in a muffle furnace at 880 °C for 15 min.

[0036] 4. Assemble the parts. The sealing ring uses POM polyoxymethylene soft seal. Apply high - vacuum sealant when assembling the parts. Wipe the assembled enamel reaction kettle with a soft cloth to remove visible dirt during the production process, and obtain an acid - and alkali - resistant enamel reaction kettle.

[0037] Example 2

[0038] 1. According to the design requirements, build a steel frame carrying a reaction kettle, using a triangle. The round steel pipe uses No. 10 steel. The support is composed of a round steel pipe, a backing plate, a bottom plate, and anchor bolts. Continuous welding is used between the backing plate on the upper part of the support and the container shell.

[0039] 2. Select stainless steel 316L as the base material of the reactor, and perform pre-treatments such as grinding and cleaning on the surface of stainless steel 316L with sandpaper and acetone. Deburr, remove oil stains and rust on the surface, and dry and store for later use. Press the steel plate into a baffle with a jig and weld it to the inner wall of the reactor.

[0040] 3. Stir the glass-lined primer evenly with water and then spray it on the steel substrate of the reactor. Bake it at 930 °C for 30 min and bake it 4 times to obtain the glass-lined primer. Uniformly mix silicon oxide in the glass-lined topcoat powder by mechanical stirring. Mix the mixed glass-lined glaze and water in a ratio of 2:1 to form a slurry and stir for 30 min. Pour the mixed glaze slurry into a spray gun, connect the spray gun to a compressed air source, and use a spraying pressure of 0.6 MPa; by controlling the spraying height and cycle (spraying from left to right as a cycle), ensure that the glass-lined layer has the same thickness. Spray the slurry on the steel substrate with the primer layer, and let it air dry naturally in a ventilated and shady place for 24 h after spraying. Then bake it in a muffle furnace at 880 °C for 15 min.

[0041] 4. Assemble the parts. The sealing ring uses POM polyoxymethylene soft seal. Apply high-vacuum sealant when assembling the parts. Wipe and clean the assembled glass-lined reactor with a soft cloth to remove visible dirt during the production process, and obtain an acid- and alkali-resistant glass-lined reactor.

[0042] Example 3

[0043] 1. According to the design requirements, build a steel frame carrying the reactor. Use triangles, and the round steel pipes are made of No. 10 steel. The support is composed of round steel pipes, backing plates, bottom plates, and anchor bolts. Continuous welding is used between the backing plate on the upper part of the support and the container shell.

[0044] 2. Select stainless steel 316L as the base material of the reactor, and perform pre-treatments such as grinding and cleaning on the surface of stainless steel 316L with sandpaper and acetone. Deburr, remove oil stains and rust on the surface, and dry and store for later use. Press the steel plate into a baffle with a jig and weld it to the inner wall of the reactor.

[0045] 3. Stir the glass-lined primer evenly with water and then spray it on the steel substrate of the reactor. Bake it at 930 °C for 30 min and bake it 4 times to obtain the glass-lined primer. Uniformly mix yttrium oxide and nickel particles in a ratio of 1:1 in the glass-lined topcoat powder by mechanical stirring. Mix the mixed glass-lined glaze and water in a ratio of 2:1 to form a slurry and stir for 30 min. Pour the mixed glaze slurry into a spray gun, connect the spray gun to a compressed air source, and use a spraying pressure of 0.6 MPa; by controlling the spraying height and cycle (spraying from left to right as a cycle), ensure that the glass-lined layer has the same thickness. Spray the slurry on the steel substrate with the primer layer, and let it air dry naturally in a ventilated and shady place for 24 h after spraying. Then bake it in a muffle furnace at 880 °C for 15 min.

[0046] 4. Part assembly. The sealing ring uses POM polyoxymethylene soft seal. When assembling the parts, high-vacuum sealant is applied. After the assembled glass-lined reactor is completed, it is wiped with a soft cloth to remove visible dirt during the production process, obtaining an acid- and alkali-resistant glass-lined reactor.

[0047] Example 4

[0048] The additive is nickel particles, and other preparation steps are the same as those in Example 3.

[0049] Acid- and alkali-resistant corrosion performance test

[0050] A commercially available glass-lined reactor is used as a comparative example. The glass-lined reactors fired in Examples 1-4 and the reactor in the comparative example are cleaned with anhydrous ethanol, weighed after drying and cooling, and the original weight is recorded. Acid corrosion: The glass-lined enamel block is immersed in a 30 vol% sulfuric acid solution at 80°C. Alkali corrosion: The glass-lined enamel block is immersed in a 0.1 mol / L sodium hydroxide solution at 80°C. The temperature is continuously maintained at 80°C by means of water bath heating. After corrosion for a certain period of time, it is cleaned with deionized water and anhydrous ethanol, dried and cooled to room temperature, and then weighed after corrosion, and the cross-sectional surface morphology is observed.

[0051] Cross-sectional porosity

[0052] Table 1

[0053] Group Porosity % Example 1 5.9 Example 2 4.3 Example 3 3.4 Example 4 3.2 Comparative Example 11.6

[0054] Adding nickel particles to the glass lining will bring great changes to the internal structure. Gases such as H2, CO2, and CO generated during the firing process are trapped inside to form spherical pores of different sizes. It can be seen from Table 1 that the acid- and alkali-resistant corrosion rate of the reactor obtained by the present invention is significantly improved compared with the commercially available glass-lined reactor. The cross-sectional porosity of the glass lining shows a decreasing trend with the increase of nickel particles. For the mechanical properties of the glass-lined reactor, the decrease in porosity can enhance the ability of the internal structure to resist external force damage, while the increase in porosity will reduce this ability, and the increase in porosity is not conducive to corrosion protection.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A production process of an acid-resistant and alkali-resistant glass-lined reactor, comprising the following steps: (1) Preparation of the steel frame structure carrying the glass-lined reactor. The support is composed of a round steel pipe, a pad, a bottom plate, and anchor bolts. (2) Preparation of the glass-lined reactor substrate: stainless steel 316L is selected for grinding, cleaning, cutting, rolling and welding. (3) The glass-lined reactor is processed and formed, and metal additives are introduced into the glass-lined glaze powder to increase the acid and alkali corrosion resistance of the reactor. (4) Optimization of assembly and processing of glass-lined reactor parts.

2. The production process of an acid-resistant and alkali-resistant glass-lined reactor according to claim 1, characterized in that: The steel frame structure carrying the reactor adopts a triangle shape, referring to "Container Support Part 4: Support Type Support" (NB / T 47065.4-2018). The round steel pipe is made of No. 10 steel, and continuous welding is used between the pad on the upper part of the support and the container shell.

3. The production process of an acid-resistant and alkali-resistant glass-lined reactor according to claim 1, characterized in that: The preparation process of the glass-lined reactor substrate is as follows: (1) Select stainless steel 316L as the reactor base material, and use sandpaper and acetone to polish and clean the surface of stainless steel 316L. Remove burrs, remove oil and rust on the surface, and dry and store for later use. (2) The steel plate is pressed into a baffle using a mold and welded to the inner wall of the reactor.

4. The production process of an acid-resistant and alkali-resistant glass-lined reactor according to claim 1, characterized in that: The preparation steps for processing and molding in a glass-lined reactor are: (1) Add water to the glass-lined base glaze material, stir it evenly, and then spray it on the steel substrate of the reactor, and then enamelled it to obtain the glass-lined base glaze. (2) The additives are uniformly mixed into the glass-lined glaze powder by mechanical stirring, and the mixed glass-lined glaze and water are mixed in a ratio of 2:1 to form a slurry, which is stirred for 30 minutes. (3) Pour the mixed glaze slurry into the spray gun and spray the slurry on the steel substrate with the base glaze layer. After spraying, let it dry naturally in a ventilated and cool place for 24 hours. (4) The resulting product was then fired in a muffle furnace at 880°C for 15 min.

5. The glass-lined reactor according to claim 4 is characterized in that: The calcining conditions in step (1) are calcining at 930° C. for 30 minutes, and calcining 3 to 4 times.

6. The glass-lined reactor according to claim 4 is characterized in that: The additive in step (2) is one or more of lithium carbonate, silicon oxide, zirconium oxide, titanium oxide, cobalt oxide, yttrium oxide, and nickel particles, and the added amount is 3wt.%.

7. The glass-lined reactor processing and molding according to claim 4 is characterized in that: The slurry spraying conditions in step (3) are to connect the spray gun to a compressed air source and use a spraying pressure of 0.6 MPa; by controlling the spraying height and cycle (spraying from left to right as a cycle), the glass-lined layer is ensured to have the same thickness.

8. The production process of an acid-resistant and alkali-resistant glass-lined reactor according to claim 1, characterized in that: The parts assembly and optimization of glass-lined reactors include: (1) The sealing ring design uses POM polyoxymethylene soft seal and applies high vacuum sealing grease during assembly to improve the sealing of the reactor body. (2) Wipe the assembled glass-lined reactor with a soft cloth to remove visible dirt from the production process.

9. A production process for an acid- and alkali-resistant glass-lined reactor, characterized in that: The acid and alkali resistant glass-lined reactor is prepared by the method described in any one of claims 1 to 8.