CN115975746A - Scale inhibitor for coking plant equipment and preparation method thereof - Google Patents

Abstract

The invention belongs to the technical field of scale inhibitor preparation, and relates to a scale inhibitor for coking plant equipment and a preparation method thereof. The scale inhibitor is composed of the following raw materials in mass percentage: 30-50% of amide compounds, 30-40% of sulfone compounds, 5-8% of magnetic nanoparticles, 2-5% of dispersants, 1-3% of penetrants, The balance is water. The technical solution provided by the invention utilizes compounding of different components to achieve the purpose of efficiently removing coking of the unit through online dosing, which ensures the loss of production capacity caused by shutdown during the maintenance period and avoids the safety risk of manual cleaning.

Description

A kind of scale inhibitor for coking plant equipment and preparation method thereof

technical field

The invention belongs to the technical field of scale inhibitor preparation, and relates to a scale inhibitor for on-line filling of primary coolers and compressors in a coking plant, in particular to a scale inhibitor for equipment in a coking plant and a preparation method thereof.

Background technique

It is well known in the industry that the medium in coking plants is generally dirty, and the coking phenomenon of the unit is serious. Specifically: In the coking process section, the organic matter in the coal will undergo polymerization reaction at high temperature. As the coking gas is brought to the subsequent process section, the temperature of the gas medium cools down, and the viscosity of the organic matter increases sharply, sticking to the unit. Cause the unit to coke.

According to the actual investigation on the spot: the coking at the primary cooler and the compressor is the most serious. Specifically: the accumulation of tar at the primary cooler causes the temperature of the coke oven gas to be unable to cool effectively, thereby affecting the recovery rate of tar in the electric capture process section; the accumulation of tar at the compressor leads to an increase in the vibration value of the unit, unstable operation or even stuck, serious Affect on-site safety production. At present, the traditional cleaning methods (sand blasting and calcination) have a long cycle and need to be shut down for manual cleaning, resulting in a sharp decline in production capacity during the cleaning period, and because the coking plant gas contains hydrogen-rich (colorless, odorless, flammable and explosive) , There are potential safety hazards in the manual operation process.

In view of this, the present invention is proposed.

Contents of the invention

The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art, and provide a kind of antiscalant for coking plant equipment and its preparation method, to overcome the defects of the prior art, and achieve the purpose of efficiently removing the coking of the unit through online dosing. And it can avoid the loss of production capacity caused by downtime.

The purpose of the present invention is achieved through the following technical solutions:

This scale inhibitor for coking plant equipment is composed of the following raw materials in mass percentage: amide compounds 30-50%, sulfone compounds 30-40%, magnetic nanoparticles 5-8%, dispersant 2 -5%, penetrant 1-3%, and the rest is water.

Further, the sulfone compound is dimethyl sulfoxide.

Further, the amide compound is at least one of N-N dimethylformamide or N-N dimethylacetamide.

Further, the magnetic nanoparticles are Fe ₃ O ₄ nanoparticles, and the particle diameter is ≤100nm.

Further, the dispersant is polyethylene glycol.

Further, the penetrating agent is diisooctyl maleate sulfonate.

Furthermore, the concentration of the scale inhibitor added in the coking gas medium is 100-400ml/(10 ⁴ m ³ ).

In addition, the present invention also provides a method for preparing a scale inhibitor for coking plant equipment as described in part or all above, comprising the following steps:

S1. Add 30-50% mass percentage of amide compounds into quantitative water, stir at room temperature, until completely uniformly mixed to form solution A;

S2. Add a sulfone compound with a mass percentage of 30-40% to the solution A, and stir at room temperature for 10-15 minutes to obtain a solution B;

S3. Add a dispersant with a mass percentage of 2-5% to the solution B, and stir at room temperature for 15-25 minutes to obtain a solution C;

S4. Add magnetic nanoparticles with a mass percentage of 5-8% to the solution C, and stir at room temperature for 10-15 minutes to obtain a solution D;

S5. Add 1-3% penetrant by mass to the solution D, and stir at room temperature for 30-40 minutes to fully dissolve it to form a scale inhibitor.

Compared with the prior art, the technical solution provided by the present invention includes the following beneficial effects: the antiscalant can achieve the purpose of efficient on-line (no shutdown) treatment of coking through the compounding of different components, specifically as follows: ①By introducing magnetic nano material, which can carry more agents for dispersing and dissolving coke to the coking unit interface, and with the continuous injection of agents, a dynamic equilibrium adsorption film containing agents will be formed on the interface of the unit due to magnetic adsorption, and the coking can be suppressed to the greatest extent Gather and grow. ② The innovative application of dimethyl sulfoxide compound performance, not only can effectively treat coke with amide compounds, but also can be used as a dispersant together with polyethylene glycol to ensure that the magnetic nanomaterials are more uniformly dispersed in the liquid agent, so that the subsequent The interface of the unit is evenly adsorbed. ③The use of the penetrant makes the coke formed on the inner interface of the unit carry the agent to the "inside" of the coke along with the penetrant, so as to achieve the purpose of thoroughly treating the coke. The antiscalant, as a whole, uses several chemicals to work together to ensure the long-term stable operation of the equipment and significantly increase the profit of the enterprise.

Detailed ways

The exemplary embodiments will be described in detail here, and the implementations described in the following exemplary embodiments do not represent all implementations consistent with the present invention. Rather, they are merely examples of products, methods, and methods consistent with aspects of the invention as recited in the appended claims.

The invention provides a scale inhibitor for coking plant equipment, which is composed of the following raw materials in mass percentage: 30-50% of amide compounds, 30-40% of sulfone compounds, 5-8% of magnetic nanoparticles, and 2-5% of dispersants %, penetrant 1-3%, and the balance is water. Wherein, the sulfone compound is dimethyl sulfoxide.

Among them, the present invention carries coke oven gas and magnetic nanoparticle adsorption synchronously, so that the amide compounds and dimethyl sulfoxide used to treat the coke can form more effective contact areas with the coke, and the raw materials used are all low Toxic and environmentally friendly. Especially the simultaneous use of dual functions of dimethyl sulfoxide: on the one hand, dimethyl sulfoxide is used to disperse magnetic nanoparticles, and on the other hand, it is used as an excellent dispersant and solvent for coking. In addition, the synergistic use of penetrants enables the agents to treat the coke that has accumulated into a block in depth.

Further, the concentration of the antiscalant for the primary cooler and online filling of the compressor in the coking plant is 100-400ml/(10 ⁴ m ³ ). Injected into the line as an IV infusion.

From the above analysis, it can be seen that the present invention significantly improves the efficiency of the action of chemicals and coke through magnetic nanoparticle adsorption and coke oven gas carrying more chemicals, and maximizes the effect of chemicals through the synergistic use of dispersants and penetrants. Therefore, the antiscalant provided by the present invention is composed of various raw materials, and only one of them can not achieve the expected antiscaling effect when used alone.

In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below in conjunction with examples.

Example 1

This example provides an antiscalant for the primary cooler and online filling of the compressor in a coking plant, which is made of the following raw material components in mass percentage: 20% each of NN dimethylformamide and NN dimethylacetamide %, dimethyl sulfoxide 30%, Fe ₃ O ₄ nanoparticles 8%, polyethylene glycol 5%, maleate diisooctyl sulfonate 3%, the rest is water, the mass of the above components The sum of the percentages is 100%.

In addition, this embodiment also provides a method for preparing an antiscalant for online filling of primary coolers and compressors in a coking plant, which specifically includes the following steps:

S1. Add 20% N-N dimethylformamide and 20% N-N dimethylacetamide into quantitative water, and stir at room temperature until completely uniformly mixed to form solution A;

S2. Add dimethyl sulfoxide with a mass percentage of 30% to the solution A, and stir at room temperature for 15 minutes to obtain a solution B;

S3. Add polyethylene glycol with a mass percentage of 5% to the solution B, and stir at room temperature for 20 minutes to obtain a solution C;

S4. Add _Fe3O4 nanoparticles with a mass percentage of 8% to the solution C, and stir at room temperature for 10 minutes to obtain _a solution D;

S5. Add 3% by mass of di-isooctyl maleate sulfonate to the solution D, and stir at room temperature for 30 minutes to fully dissolve it to form a scale inhibitor.

When the above-mentioned scale inhibitor is applied to the process section of the on-site primary cooler unit, because there is a large amount of coke in the on-site primary cooler unit section, the scale inhibitor with a concentration of 400ml/(10 ⁴ m ³ ) is added to the coke oven gas medium After 3 months, the heat transfer efficiency of the primary cooler gradually became normal, which can meet the low temperature required by the back-end electric capture.

Example 2

This example provides a kind of antiscalant for primary cooler and compressor online filling in coking plant, which is made of the following raw material components in mass percentage: 30% of NN dimethylformamide, 40% of dimethyl sulfoxide %, Fe ₃ O ₄ nanoparticles 6%, polyethylene glycol 4%, maleate diisooctyl sulfonate 2%, the balance is water, and the sum of the mass percentages of the above components is 100%.

In addition, this embodiment also provides a method for preparing an antiscalant for online filling of primary coolers and compressors in a coking plant, which specifically includes the following steps:

S1. Add N-N dimethylformamide with a mass percentage of 30% to quantitative water, and stir at room temperature until completely uniformly mixed to form solution A;

S2. Add dimethyl sulfoxide with a mass percentage of 40% to the solution A, and stir at room temperature for 10 minutes to obtain a solution B;

S3. Add polyethylene glycol with a mass percentage of 4% to the solution B, and stir at room temperature for 15 minutes to obtain a solution C;

S4. Add _Fe3O4 nanoparticles with a mass percentage of 6% to the solution C, and stir at room temperature for 10 minutes to obtain _a solution D;

S5. Add 2% by mass of di-isooctyl maleate sulfonate to the solution D, and stir at room temperature for 40 minutes to fully dissolve to form a scale inhibitor.

When the above antiscalant is applied to the on-site compressor unit section, due to the large amount of coke in the on-site compressor unit section, add 200ml/(10 ⁴ m ³ ) scale inhibitor to the coke oven gas medium for continuous injection (If the on-site equipment does not stop, it will keep filling). The vibration value of the compressor will gradually recover after one month, and then fill according to the concentration of 100-150ml/(10 ⁴ m ³ ).

Example 3

This example provides an antiscalant for primary cooler and compressor online filling in a coking plant, which is made of the following raw material components in mass percentage: NN dimethylformamide 50%, dimethyl sulfoxide 35% , Fe ₃ O ₄ nanoparticles 5%, polyethylene glycol 2%, maleate diisooctyl sulfonate 1%, the rest is water, and the sum of the mass percentages of the above components is 100%.

In addition, this embodiment also provides a method for preparing an antiscalant for online filling of primary coolers and compressors in a coking plant, which specifically includes the following steps:

S1. Add N-N dimethylformamide with a mass percentage of 50% to quantitative water, and stir at room temperature until completely uniformly mixed to form solution A;

S2. Add dimethyl sulfoxide with a mass percentage of 35% to the solution A, and stir at room temperature for 10 minutes to obtain a solution B;

S3. Add polyethylene glycol with a mass percentage of 2% to the solution B, and stir at room temperature for 25 minutes to obtain a solution C;

S4. Add _Fe3O4 nanoparticles with a mass percentage of 5% to the solution C, and stir at room temperature for 10 minutes to obtain _a solution D;

S5. Add 1% by mass of di-isooctyl maleate sulfonate to the solution D, and stir at room temperature for 40 minutes to fully dissolve to form a scale inhibitor.

Apply the above-mentioned antiscalant to the initial stage of commissioning of the new unit, and add the antiscalant at the concentration of 100ml/(10 ⁴ m ³ ) to the primary cooler and the front end of the compressor respectively, and the unit keeps running smoothly during the maintenance period.

comparative example

This experimental example provides an antiscalant for online filling of primary coolers and compressors in a coking plant, which is made of the following raw material components in mass percentages: NN dimethylformamide 20%, dimethyl sulfoxide 35% , Fe ₃ O ₄ nanoparticles 3%, polyethylene glycol 6%, maleate diisooctyl sulfonate 4%, the rest is water, and the sum of the mass percentages of the above components is 100%.

In addition, this experimental example also provides a method for preparing an antiscalant for online filling of primary coolers and compressors in a coking plant, which specifically includes the following steps:

S1. Add N-N dimethylformamide with a mass percentage of 20% to quantitative water, and stir at room temperature until completely uniformly mixed to form solution A;

S2. Add dimethyl sulfoxide with a mass percentage of 35% to the solution A, and stir at room temperature for 10 minutes to obtain a solution B;

S3. Add polyethylene glycol with a mass percentage of 6% to the solution B, and stir at a constant temperature for 20 minutes to obtain a solution C;

S4. Add Fe ₃ O ₄ nanoparticles with a mass percentage of 4% to the solution C, and stir at a constant temperature for 15 minutes to obtain a solution D;

S5. Add 1% by mass of di-isooctyl maleate sulfonate to the solution D, and stir at constant temperature for 35 minutes to fully dissolve it to form a scale inhibitor.

Apply the above-mentioned antiscalant to the initial stage of commissioning of the new unit, and add the antiscalant at the concentration of 150ml/(10 ⁴ m ³ ) to the primary cooler and the front end of the compressor respectively. After half a year, the unit is turned on and the coking is serious.

By comparing Examples 1-3 and Comparative Examples, it can be seen that since the mass percentage of NN dimethylformamide in Comparative Examples is 20%, it is not within the scope of 30-50% defined by the present invention, and Fe ₃ O ₄ nanoparticles The mass percentage is 3%, not within the scope of 5-8% limited by the present invention, polyethylene glycol 6%, exceeding the maximum range 5% limited by the present invention, diisooctyl sulfonate maleate salt 4%, which is 5% beyond the maximum range defined by the present invention, and after applying the antiscalant to the new unit, the injection method and timing are the same as those in Example 1-3, but the unit opened coking half a year later Severely, can't reach the technical effect that the present invention can reach at all. Therefore, by using the scale inhibitor for coking plant equipment provided by the present invention, the purpose of efficiently removing the coking of the unit can be achieved through online injection, and the production loss caused by shutdown can be avoided.

The above descriptions are only specific embodiments of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention.

It should be understood that the present invention is not limited to what has been described above, and various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims (8)

1. The scale inhibitor for the equipment of the coke-oven plant is characterized by comprising the following raw materials in percentage by mass: 30-50% of amide compounds, 30-40% of sulfone compounds, 5-8% of magnetic nano particles, 2-5% of dispersing agents, 1-3% of penetrating agents and the balance of water.

2. The scale inhibitor for the coke-oven plant equipment as claimed in claim 1, wherein the sulfone compound is dimethyl sulfoxide.

3. The scale inhibitor for coke-oven plant equipment as claimed in claim 1, wherein the amide-based compound is at least one of N-dimethylformamide or N-dimethylacetamide.

4. The scale inhibitor for coke-oven plant equipment as claimed in claim 1, wherein the magnetic nanoparticles are Fe ₃ O ₄ Nano particles with the particle size less than or equal to 100nm.

5. The scale inhibitor for coke-oven plant equipment as claimed in claim 1, wherein the dispersant is polyethylene glycol.

6. The scale inhibitor for coke-oven plant equipment as claimed in claim 1, wherein the penetrant is diisooctyl maleate sulfonate.

7. Coke according to claim 1The scale inhibitor for chemical plant equipment is characterized in that the added concentration of the scale inhibitor in a coking gas medium is 100-400 ml/(10) ⁴ m ³ )。

8. A method for producing the scale inhibitor for coke plant equipment as claimed in any one of claims 1 to 7, characterized by comprising the steps of:

s1, adding 30-50% of amide compounds in mass percent into quantitative water, and stirring at room temperature until the amide compounds are completely and uniformly mixed to form a solution A;

s2, adding 30-40% of sulfone compound in percentage by mass into the solution A, and stirring for 10-15min at room temperature to obtain a solution B;

s3, adding a dispersing agent with the mass percent of 2-5% into the solution B, and stirring for 15-25min at room temperature to obtain a solution C;

s4, adding 5-8% by mass of magnetic nanoparticles into the solution C, and stirring at room temperature for 10-15min to obtain a solution D;

and S5, adding 1-3% of penetrating agent by mass into the solution D, and stirring at room temperature for 30-40min to fully dissolve the penetrating agent to form the scale inhibitor.