阅读说明：本技术 硫酸塔堵漏剂及其制备和使用方法 (Sulfuric acid tower plugging agent and preparation and use methods thereof ) 是由 白雨婷 于 2019-11-19 设计创作，主要内容包括：本发明属于化工生产技术领域,具体涉及一种硫酸塔堵漏剂及其制备和使用方法。针对硫酸生产时吸收塔内易产生漏点,尚没有高效、无需停工的修复方法的问题,本发明提供了一种硫酸塔堵漏剂,组成包括：按重量份数计,水玻璃45～60份、石英粉16～23份、石墨粉6～14份、磷酸硅4～8份。其成分还可以包括碳化硅4～8份或氧化钙2～5份中的至少一种。本发明还提供了上述堵漏剂的制备和使用方法。本发明的堵漏剂配方成分简单,价格低廉,原料易得,效果显著,安全可靠,使用寿命长。采用本发明的硫酸塔堵漏剂无需停工即可进行补漏,生产效率高,保证了生产的连续性和经济性,具有显著的经济效益和推广价值。(The invention belongs to the technical field of chemical production, and particularly relates to a sulfuric acid tower plugging agent and a preparation and use method thereof. Aiming at the problems that leakage points are easy to generate in an absorption tower during the production of sulfuric acid, and a high-efficiency repair method without shutdown is not available, the invention provides a sulfuric acid tower plugging agent, which comprises the following components: 45-60 parts of water glass, 16-23 parts of quartz powder, 6-14 parts of graphite powder and 4-8 parts of silicon phosphate. The composition may further include at least one of silicon carbide 4-8 parts or calcium oxide 2-5 parts. The invention also provides a preparation method and a use method of the plugging agent. The plugging agent disclosed by the invention is simple in formula components, low in price, easy in raw material obtaining, remarkable in effect, safe, reliable and long in service life. The sulfuric acid tower plugging agent can be used for plugging without shutdown, has high production efficiency, ensures the continuity and the economy of production, and has remarkable economic benefit and popularization value.)

1. The sulfuric acid tower plugging agent is characterized by comprising the following chemical components: 45-60 parts of water glass, 16-23 parts of quartz powder, 6-14 parts of graphite powder and 4-8 parts of silicon phosphate.

2. The sulfuric acid tower plugging agent according to claim 1, characterized by a chemical composition of: according to the weight portion, 50 portions of water glass, 20 portions of quartz powder, 10 portions of graphite powder and 5 portions of silicon phosphate.

3. The sulfuric acid tower plugging agent according to claim 1, wherein the chemical composition further comprises: 4-8 parts of silicon carbide, and preferably 5 parts.

4. The sulfuric acid tower plugging agent according to claim 1, wherein the chemical composition further comprises: 2-5 parts of calcium oxide, preferably 3 parts.

5. The preparation method of the sulfuric acid tower plugging agent as defined in any one of claims 1 to 4, comprising the steps of: weighing the raw materials in parts by weight, adding the raw materials into water glass, and stirring the mixture into a molten state to obtain the sulfuric acid tower plugging agent slurry.

6. The use method of the sulfuric acid tower plugging agent as defined in any one of claims 1 to 4, characterized by comprising the following steps:

a. performing repair welding on the surface leakage position of the sulfuric acid tower, and drilling a grouting hole by using an electric drill;

b. performing threading treatment on the glue injection hole by using a screw tap, and installing a pressurized plugging grouting valve;

c. and (3) grouting the sulfuric acid tower plugging agent slurry for 3 times, wherein the pressure of 0.3MPa is adopted for the first time, the pressure of 0.5MPa is adopted for the second time, the pressure of 0.7MPa is adopted for the third time, the interval of grouting is 1h every time, and the production is recovered after grouting for 2 h.

7. The use method of the sulfuric acid tower plugging agent according to claim 6, characterized in that: the aperture of the grouting hole in the step a is 7mm, and the hole distance is 300 mm.

8. The use method of the sulfuric acid tower plugging agent according to claim 6, characterized in that: and b, the specification of the tap in the step b is M8.

9. The use method of the sulfuric acid tower plugging agent according to claim 6, characterized in that: and c, the grouting amount is based on filling the gap between the ceramic tile and the asbestos plate and between the ceramic tile and the steel plate.

Technical Field

The invention belongs to the technical field of chemical production, and particularly relates to a sulfuric acid tower plugging agent and a preparation and use method thereof.

Background

At present, the domestic sulfuric acid production line mainly comprises: and (2) enabling the sulfur concentrate sand to enter a fluidized bed furnace for high-temperature desulfurization, enabling the prepared sulfur dioxide flue gas to enter a converter to react with a catalyst to generate sulfur trioxide, absorbing the sulfur trioxide by an absorption tower to obtain 98% of finished sulfuric acid, and preparing acid from the high-concentration sulfur dioxide flue gas by adopting a traditional two-conversion two-absorption acid preparation process. In the acid making process, the absorption tower is in a very corrosive environment for a long time, so that the acid-resistant bricks and the daub are easy to fall off or the steel shell is corroded by perforation.

In order to deal with the long-term acid corrosion, the absorption tower has a three-layer protection structure.The first layer and the second layer are acid-resistant ceramic tiles, and KPI cement is used for building between the acid-resistant ceramic tiles; meanwhile, the second layer is designed with an asbestos plate isolation layer with the thickness of 2 mm (mainly aiming at eliminating the thermal expansion difference between the shell steel plate and the ceramic tile). The third layer is a carbon steel shell, and the static 98 percent sulfuric acid reacts with the surface of the carbon steel to form thin and compact Fe₃O₄，Fe₃O₄Is difficult to dissolve in 98 percent sulfuric acid, thereby forming a protective layer and greatly delaying the corrosion speed of carbon steel. However, during the acid making process, the flowing sulfuric acid will be thin and dense Fe₃O₄The protective layer is washed away, so that the carbon steel is rapidly corroded layer by layer. Therefore, during the long-term acid making process, the sulfuric acid tower may have leakage, and the main reasons are that: (1) the welding position of the steel shell is provided with air holes or slag inclusion; (2) the construction quality of the ceramic tiles in the absorption tower is poor, concentrated acid enters between the walls of the ceramic tile tower to corrode the asbestos plates, a concentrated acid channel is formed among the ceramic tiles, the tower walls and the asbestos plates, and the surface of carbon steel is quickly corroded to form leakage under the action of temperature; (3) the acid-resistant daub has poor quality and is not corrosion-resistant; (4) when in masonry, the daub is not fully filled.

Aiming at the leakage condition of the sulfuric acid absorption tower, the commonly adopted leakage stopping method in the industry at present is as follows: (1) welding and repairing the leakage points directly by electric welding; (2) adding a carbon steel box at the leakage point, and pouring acid-resistant concrete in the box; (3) and cutting a steel plate at the leakage point, filling the ceramic tile seam with KPI (Kernel Perkin Elmer) daub, coating a layer of daub and then welding. The three methods have simple repairing process and less investment, can solve the leakage problem in a short time, but all the methods need to stop the system for treatment, and have the disadvantages of shutdown treatment, influence on production efficiency, low repairing quality and easy re-leakage in a short time.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: leakage points are easy to generate in the absorption tower during the production of the sulfuric acid, and a repairing method which is efficient and does not need to be shut down is not provided.

The technical scheme for solving the technical problems comprises the following steps: provides a sulfuric acid tower plugging agent. The chemical composition comprises: 45-60 parts of water glass, 16-23 parts of quartz powder, 6-14 parts of graphite powder and 4-8 parts of silicon phosphate.

Preferably, the sulfuric acid tower plugging agent comprises the following chemical components: according to the weight portion, 50 portions of water glass, 20 portions of quartz powder, 10 portions of graphite powder and 5 portions of silicon phosphate.

Wherein, above-mentioned sulphuric acid tower leaking stoppage agent, its chemical composition still includes: 4-8 parts of silicon carbide, preferably 5 parts.

Wherein, above-mentioned sulphuric acid tower leaking stoppage agent, its chemical composition still includes: 2-5 parts of calcium oxide, preferably 3 parts.

Preferably, the sulfuric acid tower plugging agent comprises the following chemical components: according to the weight portion, 50 portions of water glass, 20 portions of quartz powder, 10 portions of graphite powder, 5 portions of silicon phosphate, 5 portions of silicon carbide and 3 portions of calcium oxide.

The invention also provides a preparation method of the sulfuric acid tower plugging agent, which comprises the following steps: weighing the raw materials in parts by weight, adding the raw materials into water glass, and stirring the mixture into a molten state to obtain the sulfuric acid tower plugging agent slurry.

The invention also provides a use method of the sulfuric acid tower plugging agent, which comprises the following steps:

a. performing repair welding on the surface leakage position of the sulfuric acid tower, and drilling a grouting hole by using an electric drill;

b. performing threading treatment on the glue injection hole by using a screw tap, and installing a pressurized plugging grouting valve;

c. and (3) grouting the sulfuric acid tower plugging agent slurry for 3 times, wherein the pressure of 0.3MPa is adopted for the first time, the pressure of 0.5MPa is adopted for the second time, the pressure of 0.7MPa is adopted for the third time, the interval of grouting is 1h every time, and the production is recovered after grouting for 2 h.

In the using method of the sulfuric acid tower plugging agent, the diameter of the grouting hole in the step a is 7mm, and the hole distance is 300 mm.

In the using method of the sulfuric acid tower plugging agent, the screw tap specification in the step b is M8.

In the using method of the sulfuric acid tower plugging agent, the grouting amount in the step c is based on filling the gap between the ceramic tile and the asbestos plate and between the ceramic tile and the steel plate.

The invention has the beneficial effects that:

the sulfuric acid tower plugging agent provided by the invention has the advantages of simple formula components, low price, easily available raw materials, obvious effect, safety, reliability and long service life. The sulfuric acid tower plugging agent can be used for plugging without shutdown under the conditions of initial corrosion perforation and small leakage amount, and can be used for plugging by construction immediately after the liquid level is reduced even if the leakage amount is large, so that the production efficiency is high, the production continuity and economy are ensured, and the sulfuric acid tower plugging agent has remarkable economic benefit and popularization value.

Detailed Description

The invention provides a sulfuric acid tower plugging agent, which comprises the following chemical components: 45-60 parts of water glass, 16-23 parts of quartz powder, 6-14 parts of graphite powder and 4-8 parts of silicon phosphate.

Preferably, the sulfuric acid tower plugging agent comprises the following chemical components: according to the weight portion, 50 portions of water glass, 20 portions of quartz powder, 10 portions of graphite powder and 5 portions of silicon phosphate.

The silicon phosphate is particularly added to prepare the plugging agent, so that the acid resistance and the plastic toughness of the water glass can be enhanced, and the overall strength of the solidified material is higher.

Wherein, above-mentioned sulphuric acid tower leaking stoppage agent, its chemical composition still includes: 4-8 parts of silicon carbide, preferably 5 parts; 2-5 parts of calcium oxide, preferably 3 parts.

Preferably, the sulfuric acid tower plugging agent comprises the following chemical components: according to the weight portion, 50 portions of water glass, 20 portions of quartz powder, 10 portions of graphite powder, 5 portions of silicon phosphate, 5 portions of silicon carbide and 3 portions of calcium oxide.

Those skilled in the art know that calcium oxide can react with sulfuric acid to form calcium sulfate, which is a sparingly soluble substance and has obvious drawbacks for use as a lost circulation additive. Theoretical analysis shows that voids are generated after the plugging agent is solidified, and sulfuric acid entering the voids can accelerate the corrosion of the sulfuric acid on the plugging agent, so that the plugging agent cannot achieve the due effect.

However, in a great deal of experiments and researches for many years, the inventor finds that the addition of a proper amount of calcium oxide can not only avoid the above situation, but also lead the service life of the plugging agent to be longer without leakage. The possible reasons are: calcium sulfate generated by the reaction of the calcium-containing substance and the residual sulfuric acid is difficult to dissolve in the sulfuric acid, the limited residual acid in the crack of the steel plate reacts with the previous calcium, and the molten material is firmly and tightly combined with the inner wall of the steel plate in an almost acid-free environment, so that the aim of durability is fulfilled.

On the other hand, the calcium oxide is added, the calcium oxide micro powder is combined with the water in the water glass, various material components are uniformly mixed and then injected into the corrosion shell, and the reaction of the calcium-containing substance and the residual sulfuric acid can also play a role in heat release; the reaction of the calcium-containing substance and the residual sulfuric acid belongs to exothermic reaction, and the released heat can shorten the solidification time of the whole material, so that the initial setting time and the final setting time are greatly reduced, the time can be saved for enterprise production, and the plugging effect is better at places with very low external temperature.

Meanwhile, the silicon carbide is added into the plugging agent, the chemical property of the silicon carbide is stable, the silicon carbide does not react with other materials, the connection effect of the materials is enhanced, the compactness and the overall strength of the materials are improved, the effect is optimal when the silicon carbide is used in cooperation with calcium oxide, and the leakage cannot occur in the same place for a long time after plugging.

The invention also provides a preparation method of the sulfuric acid tower plugging agent, which comprises the following steps: weighing the raw materials in parts by weight, adding the raw materials into water glass, and stirring the mixture into a molten state to obtain the sulfuric acid tower plugging agent slurry.

The invention also provides a use method of the sulfuric acid tower plugging agent, which comprises the following steps:

a. performing repair welding on the surface leakage position of the sulfuric acid tower, and drilling a grouting hole by using an electric drill;

b. performing threading treatment on the glue injection hole by using a screw tap, and installing a pressurized plugging grouting valve;

c. and (3) grouting the sulfuric acid tower plugging agent slurry for 3 times, wherein the pressure of 0.3MPa is adopted for the first time, the pressure of 0.5MPa is adopted for the second time, the pressure of 0.7MPa is adopted for the third time, the interval of grouting is 1h every time, and the production is recovered after grouting for 2 h.

In the using method of the sulfuric acid tower plugging agent, the diameter of the grouting hole in the step a is 7mm, and the hole distance is 300 mm.

In the using method of the sulfuric acid tower plugging agent, the screw tap specification in the step b is M8.

In the using method of the sulfuric acid tower plugging agent, the grouting amount in the step c is based on filling the gap between the ceramic tile and the asbestos plate and between the ceramic tile and the steel plate.

The following examples further illustrate specific embodiments of the present invention, but are not intended to limit the scope of the invention to those described in the examples.